CA2232067A1 - Precrosslinked silicone elastomer particles with an organic-polymer shell as a formulation constituent in powder coatings - Google Patents
Precrosslinked silicone elastomer particles with an organic-polymer shell as a formulation constituent in powder coatings Download PDFInfo
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- CA2232067A1 CA2232067A1 CA002232067A CA2232067A CA2232067A1 CA 2232067 A1 CA2232067 A1 CA 2232067A1 CA 002232067 A CA002232067 A CA 002232067A CA 2232067 A CA2232067 A CA 2232067A CA 2232067 A1 CA2232067 A1 CA 2232067A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
- C09D5/037—Rheology improving agents, e.g. flow control agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S525/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S525/902—Core-shell
Abstract
The invention relates to the use of precross-linked silicone elastomer particles with an organopolymer shell as the formulation constituent in powder coating material compositions based on thermoplastic or thermosetting binding agents said silicone elastomer particles contain (a) 5 to 95 % by weight, in relation the total weight of the copolymerisate, of a nucleus polymer of the general formula (R2SiO2/2)x.(RSiO3/2)y.(SiO4/2)z with x = 5 to 99.5 mol %, y = 0.5 to 95 mol %, z = 0 to 30 mol %, and (b) 5 to 95 % by weight, in relation to the total weight of the copolymer, a shell made of organopolymer of ethylenically mono or multi-unsaturated monomers, R standing for identical or different monovalent C1-C6 alkyl or alkenyl residues, aryl residues or substituted hydrocarbon residues.
Description
WO 9'7/12005 - 1 - PCT/EP96/04208 Precrossli~ked ~ilico~e elastomer particles with a~
org~lic-polymer shell as a formulatio~ constituent in powd~r coatingg The in~e~tion relates to the use of precross-link~d ~ilicone elastomer particles with an organic-pol~ner shell as a formulation constituent in powder coat:ings, and to powder coating compositions based on the~noplastic or thermosetting binders comprising pre-cros~slinked ~ilico~e elastomer particles with anorga~ic-polymer shell.
Powder coati~g~ consist of solid binders based on t:hermoplastic or thermosetting polymers, such as epo~r, polyurethane, acrylic or polyester resins, on pigments and on further additives, for example cros~ilinking catalysts. These compositions are applied in powder form to pre~smin~ntly metallic substrates. The thermoplastic or thermosetting binders mentioned are gener.ally hard but brittle; to improve the film properties, therefore, impact modification of the pol~er systems is frequently necessary.
In order to obtain good impact strengths while retaining the existing, desired polymer properties such as hardness, dimenf3ional stability and mechanical streIlgth, the impact modifier must be incorporated into the thermoplastic or thermosetting systems in the form of separate, discrete microphases with optimized parti.cle size and particle morphology. This can be carri.ed out in a controlled and reproducible manner only by ~mploying the impact modifier in the form of parti.cles with a defined size and a defined size distribution as blend component. In addition, the parti.culate modifier must be highly compatible with the pol~er matrix. In that case, the domain size~ of the moditier phase are defined exactly by way of the parti.cle diameter ~nly in the case of complete phase separation does no lndesirabie plastification of the pol~ler matrix occur, whlch would result in a loss of or ad~erse effect on the properties of the polymer matrix such as hardness, ~;m~n~ional stability and mechanical strength.
Silicones are known as modifiers for ~h~rmoplastics or thermosets and are of particular interest since they not only increase the impact strength but also improve low-temperature flexibility, weathering resistance, resistance to temperature change and chemical resistance of thermoplastic and thermosetting organic-polymer systems. Generally disad~antageous, however, i8 the fl~n~:~m~ntal incompatibilty of silicones with organic polymers.
Because of this incompatibility, the use of silicone oils and silicone resins as additives to binders for powder coatings generally gi~es rise to problems with processing, such as contamination in the m; y; ng and extrusion equipment. On application it is possible for defects in flow to occur, and migration of the silicones produces problems Wit]1 adhesion and in the context of overcoatability.
In US-A 5280098~ epoxy-functional silicone resins are described as sole binder or as binder constituentr in combinatiorl with organic resins, for the formulation of powder coatings The introduction of the epoxide groups is intended to improve the elasticity and the compatibility with the organic resin. The concept of controlled microphase separation cannot be realized with the epoxy-functional silicone resins, since they do not have a particulate structure with a defined particle diameter.
US-A 5227435 proposes the substitution in powder coatings of the polyester binder by silicone-modified polye3ters which are obtained by condensing OH-functional siloxanes with glycol, followed by esterification with carboxylic acids and reaction with anhydrides. EP-A 275051 relates inter alia to acrylate-grafted silicone resins which are described as binders for powder coatings having an improved profile of prope:rties of the coat:ing films obtainable therewith.
P~ENDED SHEET
A disad~antage of the procedure according to ~S-A 5227435 and EP-A 275051 is that the silicone copolymerQ described therein are described as binders for replacing the conventional thermoplastics or S then~osets. Consequently, the silicone constituent must be incorporated into the respective polymer system by comp.lex chemical reaction, each specific binder system havi~lg to be newly synthesized from scratch. In addition, the contAm;n~tion problems typical of silicones are not ruled out by such binder systems. Here too, there is no controlled microphase separation, since the modifiers concern.ed again do not have a particulate structure.
EP-A 217257 relates to noncrosslinked or c~osslinked diorganosiloxane polymers grafted with organic polymer. These powders are processed per se and are :not employed as additives. The processing, carried out by means of rolling, calendering and kneading, produces elastomeric rubber masses but not pulverulent coating compositions based on thermoplastic or thermoset powders.
The object was therefore to provide powder coati.ng compositions which are based on conventional thermoplastic or the]~osetting binders and which have :25 improved impact strength and weathering resistance while at the same time retaining the existing, desired polymer prope!rties of the binder such as hardness, dimensional stability and mechanic:al strength.
It has surprisingly been possible to achieve :30 this object by the use of precrosslinked silicone elast.omer particles with an organic-polymer shell as a formu.lation consti~uent in powder coatings based on therm.oplastic or thermosetting binders.
One subject of the in~ention is the use of precrosslinked silicone elastomer particles with an organic-poiymer shell as a formulation constituent in powder coating compositions based on thermoplastic or therm.osetting binders, the silicone elastomer particles AMEN~ED SHEET
compri~ing a) fr~~L 5 to 95 % by w~ight, ~A~ ' on ths total weight of thLe copolymer, of a core polymer of thLe general formula ~R2SiO2/2)~-(RSiO3/2)y-~SiO4~2)~ where x = 5 to 519.5 mol%, y = 0.5 to 95 mol%, z = O to 30 mol%, aLnd b) from 5 to 95 % by weight, ba~ed on the total weight of the copolymer, of an organic-polymer ~hell of mono- or polyethylenically un~aturatecl ancl R d-noting identical or different mono~alent alkyl AMENDED S~EET
or alkenyl radicala having 1 to 6 carbon atoms, aryl radicals or substituted hydr~carbo~ radical~.
A~other subject of the in~ention are powder coati:lg compositio~ based on ~rmoplastic or ~h~m~setting binders which. comprise as formulation constituent precrosslinked silicone elastomer particles with a~ orga~ic-polymer shell, the silicone elastomer particles compri~ing a) from 5 to 95 % by weight, based on the total weight of the copolymer, of a core polymer of the general formula (~SiO2/2)~(RSiO3/2)y(SiO~/2)s where x = 5 to ~ 99.5 mol%, y = 0.5 to 95 mol%, z = 0 to 30 mol~, a~d b) from 5 to 95 % by weight, based on the total weight ~ of the copolymer, of an organic-polymer shell of mono- or polyethylenically unsaturated monomers, and R denoting ide~ti.cal or different monovalent alkyl or a:Lkenyl radicals having 1 to 6 carbon atoms, aryl radicals or substituted hydrocarbon radicals.
The silicone elastomer particles with an organ.ic-polymer shell which were employed as a formu.lation constituent, and processes for their prepa.ration, are described in EP-A 492376 (US-A
5223586)o Precrosslimked silicone elastomer particle~
means that these particles are crosslinked by way of unit~ (RSiO3~2) and (SiO4/z)~ The silicone elastomer parti.cles with an organic-polymer shell preferably comprise a) from 20 to 80 % by weight, based on the copolymer total weight, of a core polymer (~SiO2~2)~(RSiO3~2~y(SiO~2)s where x = 50 to 99 mol%, y = 1 to 50 mol%, z = 0 to 20 mol%, and b) from 20 to 80 % by weight, based on the copolymer total weight, of an organic-polymer shell of mono-or polyethylenically unsaturated monomersr and R being a~ defined above.
The finely d.i~ided graft copolymers preferably have a mean particle diameter of from 10 to 300 nm, part:icularly preferably from 30 to 150 nm. The particle sizes may f luctuate withi~ thLe abovementioned rc~Lge;
preferably, a ml~n-~m~dal particle-size di~tribution is prese~lt with a m~Y~mt~m polydisper6ity index of t~2 = 0.2.
The radicals R are pref eraLbly alkyl radicals, 5 8UC~L a8 the methyl, ethyl, n-propyl, isopropyl, D.-butyl, sec-butyl, amyl, hexyl radical; ~1 kenyl radicals, such as the ~rinyl, allyl, butenyl aDd l-hexenyl radical; aryl radicals, such as the phenyl radical; or substituted ~ hydro~_arbon radicals, such as halogenated hydrocarbon 10 radicals, mercaptoalkyl radicals, cya~Loalkyl radicals, ~m; noaLlkyl radicals, acyloxyalkyl radicals, hydroxyalkyl radici3Lls .
Particularly pre$erred radicals are methyl, ethyl, propyl, phenyl, vi~yl, allyl, 1-hexenyl, 3-meth-15 acryloxypropyl arLd 3-mercaptopropyl, less than 30 mol%
of the radicals in the siloxane polymer being vinyl, 3-methacryloxypropyl or 3-mercaptopropyl groups.
Monomers employed for the orga~Lic polymer compo-nent b) are preferably acrylates ~r methacrylates and 20 morLo- or diesters of fumaric and maleic acid with aliphatic alcohols a~Ld diols having 1 to 10 carbon atoms, acrylamides and methacrylamides, acrylonitrile, styrene, p-metilylstyresLe, a-methylstyrene, diviDIylbenzene, vinyl acetate r ViILyl propionate, 25 maleimide, vi~Lyl chloride, mono- and divinyl ethers, ethyle~Le, butadiene, isoprene and chloroprene.
Particular prefere~ce is given to styrene a~Ld to acryl.ates and methyacrylates of aliphatic alcohols haviD.g 1 to 4 carbon atoms, for exa~cLple methyl 30 (meth) acrylate, butyl (meth) acrylate a~Ld glycidyl (meth) acrylate . Both homopolymers and copolymers of the abovementioned mono~m~rs are suitable as organic polymer c ompoD en t .
The polysil ~xane graf t base is prepared 35 according to the emulsion polymerization process by meterirlg in the corresponding mixture of monomeric siianes of the type R~,Si (OR ) 4,," where a = O, 1 or 2, or, if desired, low molecular mass siloxanes of the general formula (R2Sio)l where n = 3 to 8, to an agitated emul~:ifier/water mixture. The radical R has the defi~:itions already given. R' repre~ents alkyl radicals ha~ing 1 to 6 carbon atoms, aryl radicals or substituted hydrocarbon radical~, with methyl, ethyl and propyl radicals being preferred. The silane or the silane mixtu:re or silane/siloxane mixture i8 added ln metered form. The emulsion polymerization is carried out at a temperature of from 30 to 90~C, preferably from 60 to 85~C, and preferably at atmospheric pressure. The p~ of the polymerization mixture is from 1 to 4, preferably from :2 to 3.
~ Examples of suitable silanes are, for silanes of the general formula R2Si(OR') 2~ dimethyldiethoxysilane or dimet:hyldimethoxysilane; for oligomers of the formula (~SiO)~ where n = 3 to 8, octamethylcyclotetrasiloxane or heY~ethylcyclotr.isiloxane; for silanes of the general formula RSi(OR') 3, methyltrimethoxysilane, phenyltriethoxy~ilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane or methacryloxypropyl-20-trimethoxysilane, and, for silanes of the general formula Si(OR')~, tetramethoxysilane or tetraethoxy-silane.
In the last step of the preparation process the abo~ementioned ethylenically unsaturated monomers are grafted onto the poly~iloxane graft base. Grafting takes place according to the emulsion polymerization process in the presence of water-soluble or monomer-soluble free-radical initiators. The graft copolymers can be isolated from the emulsioD. by known methods. For example, by coagulating the latices by means of salt addit.ion or addition of polar sol~ents or by spray drying .
The degree of crosslinking of the silicone core deter~ines its elastic properties and can be established speci.fically in a manner familiar to the person skilled in the art by an appropriate choice of the starting components, corresponding alko~silanes and/or silcxanes in order to obtain nnits (RSio;/2) and/or (SiO4~2). The incorporation of silane units comprising olefinically unsatu:rated doubl~ bond~, for p~rlq ~inyl radical-~ or 3-m~thacryloxypropyl radicals, permits, in the subseq~ent graft polymerization, a chemical ~n~ing Of the organic-polym~r ~hell to the silicone core by coval~:nt bond~. By choosing ~uitable mo~L~ -~ for the synthesis of the organic polymer ~hell b) it i~ possible - to tailor the organic-polymer ~hells. Thus by grafting a copoly~Ler sh-ll comprising, for examplo, methyl methacrylate (high Tg) and n-butyl acrylats (low Tg) onto ;~L crossl;n~~~ silicone core it is possible to e~tablish ~ fically the soft~n;n~ t~m~srature of the polymer shell and thereby to m~tch it exactly to the roquirement during processing, esp~ ly extrusion, of the ~o~Jd r coating ~ ~t~. By grafting a copolymer shell comprising, for example, m~thyl methacrylate and glycidyl methacrylate onto a crossl~n~e~ silicone core, on thL~ one hand it is pos ible, owing to the epoxide function~ in the organic-polymer shell which are introduced with glycidyl methacrylate, to obtain a matrix attachment between modifier particles and binder resin of the powder coating composition, and on the other hand these modifier particles are able to act as crosslinking agents in binders based on polyester reslns.
The mo~t preference, accordingly, i~ for cross-linked. silicone ela~tomer particles ~ith a core compri~ing (R2SiO2/2)y(RSiO3/2)y where x = 80-99 mol% and y = 1-20 mol%, R being able to be identical or different and ha~ing the definition R = methyl, 3-methLacryloxy-propyl., a~d withL a shell of poly~methyl methLacrylate) or copolymer ~hells of methyl methacrylate and butyl acrylal.te or glycidyl methacrylate.
The proportion of tkLe core polymer, ba-~ed on the total copolymer weight., is particularly preferably 50-75 ~ by weight, and accordingly the proportion of theorgani.c-polymer ~hell i~ particularly preferably 25-50 %
by ~ei.ght. This correqpond-R to an organic-polymer degree of graLfting of 33-100 ~I.
The additi~e nature of t}.Le silicone ela~tomer par~ i c l ~ ~rith an organic-polymer sh~ll and the ease of incorE~oration by compo~n~l; n~ 1 -r~; t u~e with all common bincles systems for ~o~ r coatings . Examplos of hi n~
~ y:~t~ls for ~o~ r coating~ are epoxy r-sins, epoxy-5 novolak r~ins, poly-ster resins, ~G~y polye ter re~in~l, polyest-r hybrid r-sins, polyacrylate resins, polymelthacrylate resins, polyurothane re ~in-l, polyet hyl--n-- resins (~D-PE, ID-PE, I~-PE), poly~. ~.~ylen-- re in~ ~ poly~rinyl chloride re~ins, 10 ethyleme/~rinyl acotate copolymers, polya~i ~ nd cellulos- ester~.
Th- Si 1 i ~o--~ elastomer particlos with an organi.c-polymer sh~ll are generally added in a quantity of frem 0 . 5 to 20 % by weight, preferably from 1. 0 to 15 10 9~ by ~eight, ba~ed in each ca~e on the total weight of the silicone elastomer component and binder comror-s~ t .
Th~ oi.licone ola~tomer pArticles with an organic-polymer shell can be processed to powder coatings after 20 pr ~ i ~ i ng with binder, pigments and further additives, ror example ha dersr, by extrusion or comparable ~; Y; ng proce~ es in a temperature range from 5 to 160 CC f preferably from 60 to 110~C. Thi~ corresponds to the customary procedures for preparing powder coatings.
25 Com ni nution, grinding nd sieving can be carried out in accordance with the state of the art.
In general, the procedure i-- such that the binder . - - t i9 pree~ uted and is ~i Y~l inten li~ely with the ~ilicone elastomer particles, with 30 pigments, catalysts and additi~res, for example in fluid mixer-~. The composition pas ie~ ~ria a metering de~ice into an extruder, i - which the material is melted and homog~nized at temperatures which lie above the sof t~ n~ point of thH binder and below the acti~ration 35 temper.ature of the cros li nki ~Ig catalyst ~hardener) . The extrucled pastelike ;~terial emerges from the extruder ciie and i-l then rolled out by rollers to a layer thicknes ~ of from 2 to 3 mm coolet comminuted and finely ground; fin~lly the powder ia sie~ed to the d sirs~d partiele size.
Thq ~o~ eoating eompositions ob~-ina~le in this ~ay ean b~ proces~ed u~ing tho application m~thods whieh are known for ~ou'- r eoating~, for example by the elcetro tatie ~y a~ing, eleetrostatie eoating, tr~ tric and corona processQs, fluidized-bed sintering, electsostatic fluidized-bed -qintering, bulk sintering and eentrifugal ea ting. A eommon feature of all ~:intsring method~ is that th- material is melted under the influ~nee of heat during film fosmation; in th~ eaQe of thermo~etting plastie~, this i9 then additionally followed by a euring eyele. A eo ,on f-ature of the eleetrostatie applieation m~thods is that thQ ~t~ ,e r is generally appli~d to a eold, earthed ba~e material. O~ing to thei.r eleetrostatie eharge the powder partiel~s adhere to the workpiec~, whieh i~ then heated in an o~en, wheroby th~ partieles melt and - in the c~ae of cura~le polym~rs - are cured.
The powder coating compoaition according to the invent.ion i~ ~uitable for all powder coating applica-tions, for exampls metallie fin;~hi~ in the automotiYe ~ector (clearco~t, topcoat, interior finish, filler, stone-chip protection and ~ hody protection), of rail-bound ~ehiclea and aircraft (exterior finish), domest.ic appliances ~for example chest freezera, refrigerators, dishwa~hers), architoctural componenta both l~xternal (windo~ frames, exterior panela, doors, gates) and internal ~metal furnituro, lamp housings), bicyel.os, nowmobile~, shipping eontaine~ igns, aluminium wheel rim~.
In the powder eoating composition~ according to the i.nvention, the required criterion of microphase separa.tion for improving the impact strength in thermoplastics a~d thermoset~ while at the ~ame time retaining the existing polymer properties such as hard-ness d~men~ional Ytak~ility and mechanlcal ~trength is met. .In adc~tion to an. improvement in the (low-tempera-ture) impact strength, the powder coating compositions also achie~e, for example, impro~ed gloss retention (weath-~ring r~sistance) and scratch reQistanca, with no ad~-rs-- ~ffect on hardne~s, ~ ional st~h;lity and me~h~nit~-l strength. The ~il içon~ ela~tomer particle~
with ~n organic-polym~r ~hell can b- incorporated (com-po~ t) as formulation constituents into powd~r co~ting~- r~:itions ~imply and without problem~ in accordance with co~.~,~..tional proces- t~hn;~ueQ. ContAm;n~tion probl~ and flow defscts do not occur. O~ercoatability 'of the re ulting powder coatings i~ pro~ided.
The te t results in the examples which follow tl~ ~n~trat- th~t th- ~ mpact) tolghn-~s of the powder coatin~s, e~en at low temperatures, i~ improved by the addition or s;l;~ ela~tomer particles ~ith an organic-polym r ~hell ~ithout any ad~erse effect on the ~5 hardne~s and adhe~io~ of the powder coatingV In a~ tion, the woathering re~istance i~ also improved.
Exa~plle-~:
Example~ 1 - 2 Compari~on Example 1 (Tablo 1):
A carboxyl-contAi n- nt polye~ter powder coating ~baqed on Uralac DSM) was mixed with 10 % by ~eight ~Example 1) 3 % by weight (Example 2) and 0 % by weight ~Comp Ex ll of silicone particle~ with a core compri~-ing (R2SiO2~2)~R~SiO3J2)y ~x = 95 mol% y ~ 5 mol%; R =methyl R = methyl 3-methacryloxypropyl) and a poly-methyl methacrylate ~hell ~PNM~ degree o~ grafting 50 %
by weight pr;m~ry particle size 100 nm) and t~e mixture was extruded (extruder: MP 2000PC APV-Baker) ground ~ie~sd and then appli~d to aluminium panels or metal pan~l by spraying with a powd~r handgun (ESB Integral 2020 Wagner) The ~ n~ operation wa-~ carried out at 200~C for 10 minute~ Tho te~t re~ult of the powder coatings are compiled in Table 1 In addition to the test ~tandards indicated in the tabl~ the follo~ing test methods were employed ~he Rlinig pendulum hardnQss wa~ tested in accor~ce with DIN 53137 The rever3e impact wa~ determined by ball i~pact testing ~ 11 ~
with tho Erich-~en ~all impact te~ting ins~trument model 304.
The c:ros~-hatch ~as dete.-m;ned u~ing the method according to DIN 53151.
They show that the to~l~hns~ (rever~e impact) and aclhesion (cro~s-hatch, h~;d climatic conditions) ~ are in~provod by at1~;n7 the silicono elastomer powder with a PMMA shell; th- hardnes~ i~ not adversely affectlsd. The mea~urem~nt~ of the reduction in glosq after 2000 hour~ of Q W -B weathering (triple-region glo~ meter, Dr. ~ange) ga~e, for the powder coating from C~r~ri~on r~ 1 in ~mp~i on with the powder coating from Example 1, a reduction in glo-~ which wa~
hi~r by 200 %. Th~ resistance of the powder to Q W-B
weathe:ring is likewi~ impro~ed by at~ ng the silicone elasto~er particles with an organic-polymer shell.
Exampl~e 3:
An acrylato powder coating (based on Alftalat, ~oech-~t) wa~ ~;Y~A with 2 % by weight, 5 % by weight and 10 % by weight of ~ili.cone particle~ as in Example 1-2 and the mixtur~ was extruded textruder: Moe 2000PC, APV-Baker) ground, sieved and then applied to aluminium panel~ or metal panels by 3praying with a powder handgun (ESB Integral 2020, Wagner). The baking operation was carried out at 160~C ~or 20 minutes. Tho mQasurement results (at -20~C) qhowed that with an increasing quantity of silicone elastomer particles with a ~MM~
sholl, from 2 % by weight to 10 % by weight, the rever~e impact ~alue roso by 50 %.
Example 4:
An epoxy re~in powder coating (ba~ed on Araldite, Ciba Geigy) was mixed with 5 % by weight and 10 % by weight of silicone part~cles as in Example 1-2 and t~e mlxture wa~ ext~ ded ~extruder ZS~ 25~ Werner ~
Pfleiderer) and then applied to metal panels by ~praying with a powder handgun (Mars II P~-6, Bollhofer) The baking operation was carried out at 180~C for 10 CA 02232067 l998-03-l3 minut s The mea~urement result~ sho~ed that ~ith an a~ition o~ olastom r ~articlos ~ith a PMM~
sh-ll of 5 % by ~eight and 10 % by ~ight the rever~e i~pact ~aluo in~ s by 10 % and 40 % re~pecti~oly At th- ~me t~me, the stone-chip ro~i~tance ~as i~lovel CA 02232067 l998-03-l3 S~l~ 1:
Co~p ~Y~3p~ a~pl~ 2 ~Ya~pl- 1 Propor~ on Or ~ O ~ by ~t 3 ~ by ~t10 ~ by vt olaJtosu~r povd~r vlth a PM~A
uh ll Avorag ~ rh;~ a2 ~o +- 6 ~n 83 ~c +- 4 ~ 80 ~m +- 11 ~m ~~onig i ~ 14~ 1~6 135 P ncil ~ ~~~ 5R 5H 5~
Mi~ dou~ rub- >200 >200 >200 RJvor-- impact in ~ LbJ 70 80 ag T-b nd ~ ~ ~
9alt rpray t-ating ~ - ng to 99 DrN 50 021 T--t dhration 263 hour~
Croo--hltch ~ithout adh -iv Ct ~ Ct 1 Ct 1 t p-Crooo-h tch ~ath adhooiYa t~p~ ce 1 Ct 1 Ct 1 Dogruff o~ ru~t ng according to R 3 Rl 3 ~1 3 DIN 53 'lO
D~gr- oi bli~t ring --o r~i ng no no no to Dr~ !j3 209 Ru~t (G ~ 3 3 2 8umld cli tc - ng to 5~ DrN 50 017 Toot duration 640 hour~
Cro-o-hltch ~ithout dh-~iv- Ct 4 Ct 2 Ct 0 tap C~o~J-hlt~h ~itb adh-oiva tap Ct S Gt 3 Gt 0
org~lic-polymer shell as a formulatio~ constituent in powd~r coatingg The in~e~tion relates to the use of precross-link~d ~ilicone elastomer particles with an organic-pol~ner shell as a formulation constituent in powder coat:ings, and to powder coating compositions based on the~noplastic or thermosetting binders comprising pre-cros~slinked ~ilico~e elastomer particles with anorga~ic-polymer shell.
Powder coati~g~ consist of solid binders based on t:hermoplastic or thermosetting polymers, such as epo~r, polyurethane, acrylic or polyester resins, on pigments and on further additives, for example cros~ilinking catalysts. These compositions are applied in powder form to pre~smin~ntly metallic substrates. The thermoplastic or thermosetting binders mentioned are gener.ally hard but brittle; to improve the film properties, therefore, impact modification of the pol~er systems is frequently necessary.
In order to obtain good impact strengths while retaining the existing, desired polymer properties such as hardness, dimenf3ional stability and mechanical streIlgth, the impact modifier must be incorporated into the thermoplastic or thermosetting systems in the form of separate, discrete microphases with optimized parti.cle size and particle morphology. This can be carri.ed out in a controlled and reproducible manner only by ~mploying the impact modifier in the form of parti.cles with a defined size and a defined size distribution as blend component. In addition, the parti.culate modifier must be highly compatible with the pol~er matrix. In that case, the domain size~ of the moditier phase are defined exactly by way of the parti.cle diameter ~nly in the case of complete phase separation does no lndesirabie plastification of the pol~ler matrix occur, whlch would result in a loss of or ad~erse effect on the properties of the polymer matrix such as hardness, ~;m~n~ional stability and mechanical strength.
Silicones are known as modifiers for ~h~rmoplastics or thermosets and are of particular interest since they not only increase the impact strength but also improve low-temperature flexibility, weathering resistance, resistance to temperature change and chemical resistance of thermoplastic and thermosetting organic-polymer systems. Generally disad~antageous, however, i8 the fl~n~:~m~ntal incompatibilty of silicones with organic polymers.
Because of this incompatibility, the use of silicone oils and silicone resins as additives to binders for powder coatings generally gi~es rise to problems with processing, such as contamination in the m; y; ng and extrusion equipment. On application it is possible for defects in flow to occur, and migration of the silicones produces problems Wit]1 adhesion and in the context of overcoatability.
In US-A 5280098~ epoxy-functional silicone resins are described as sole binder or as binder constituentr in combinatiorl with organic resins, for the formulation of powder coatings The introduction of the epoxide groups is intended to improve the elasticity and the compatibility with the organic resin. The concept of controlled microphase separation cannot be realized with the epoxy-functional silicone resins, since they do not have a particulate structure with a defined particle diameter.
US-A 5227435 proposes the substitution in powder coatings of the polyester binder by silicone-modified polye3ters which are obtained by condensing OH-functional siloxanes with glycol, followed by esterification with carboxylic acids and reaction with anhydrides. EP-A 275051 relates inter alia to acrylate-grafted silicone resins which are described as binders for powder coatings having an improved profile of prope:rties of the coat:ing films obtainable therewith.
P~ENDED SHEET
A disad~antage of the procedure according to ~S-A 5227435 and EP-A 275051 is that the silicone copolymerQ described therein are described as binders for replacing the conventional thermoplastics or S then~osets. Consequently, the silicone constituent must be incorporated into the respective polymer system by comp.lex chemical reaction, each specific binder system havi~lg to be newly synthesized from scratch. In addition, the contAm;n~tion problems typical of silicones are not ruled out by such binder systems. Here too, there is no controlled microphase separation, since the modifiers concern.ed again do not have a particulate structure.
EP-A 217257 relates to noncrosslinked or c~osslinked diorganosiloxane polymers grafted with organic polymer. These powders are processed per se and are :not employed as additives. The processing, carried out by means of rolling, calendering and kneading, produces elastomeric rubber masses but not pulverulent coating compositions based on thermoplastic or thermoset powders.
The object was therefore to provide powder coati.ng compositions which are based on conventional thermoplastic or the]~osetting binders and which have :25 improved impact strength and weathering resistance while at the same time retaining the existing, desired polymer prope!rties of the binder such as hardness, dimensional stability and mechanic:al strength.
It has surprisingly been possible to achieve :30 this object by the use of precrosslinked silicone elast.omer particles with an organic-polymer shell as a formu.lation consti~uent in powder coatings based on therm.oplastic or thermosetting binders.
One subject of the in~ention is the use of precrosslinked silicone elastomer particles with an organic-poiymer shell as a formulation constituent in powder coating compositions based on thermoplastic or therm.osetting binders, the silicone elastomer particles AMEN~ED SHEET
compri~ing a) fr~~L 5 to 95 % by w~ight, ~A~ ' on ths total weight of thLe copolymer, of a core polymer of thLe general formula ~R2SiO2/2)~-(RSiO3/2)y-~SiO4~2)~ where x = 5 to 519.5 mol%, y = 0.5 to 95 mol%, z = O to 30 mol%, aLnd b) from 5 to 95 % by weight, ba~ed on the total weight of the copolymer, of an organic-polymer ~hell of mono- or polyethylenically un~aturatecl ancl R d-noting identical or different mono~alent alkyl AMENDED S~EET
or alkenyl radicala having 1 to 6 carbon atoms, aryl radicals or substituted hydr~carbo~ radical~.
A~other subject of the in~ention are powder coati:lg compositio~ based on ~rmoplastic or ~h~m~setting binders which. comprise as formulation constituent precrosslinked silicone elastomer particles with a~ orga~ic-polymer shell, the silicone elastomer particles compri~ing a) from 5 to 95 % by weight, based on the total weight of the copolymer, of a core polymer of the general formula (~SiO2/2)~(RSiO3/2)y(SiO~/2)s where x = 5 to ~ 99.5 mol%, y = 0.5 to 95 mol%, z = 0 to 30 mol~, a~d b) from 5 to 95 % by weight, based on the total weight ~ of the copolymer, of an organic-polymer shell of mono- or polyethylenically unsaturated monomers, and R denoting ide~ti.cal or different monovalent alkyl or a:Lkenyl radicals having 1 to 6 carbon atoms, aryl radicals or substituted hydrocarbon radicals.
The silicone elastomer particles with an organ.ic-polymer shell which were employed as a formu.lation constituent, and processes for their prepa.ration, are described in EP-A 492376 (US-A
5223586)o Precrosslimked silicone elastomer particle~
means that these particles are crosslinked by way of unit~ (RSiO3~2) and (SiO4/z)~ The silicone elastomer parti.cles with an organic-polymer shell preferably comprise a) from 20 to 80 % by weight, based on the copolymer total weight, of a core polymer (~SiO2~2)~(RSiO3~2~y(SiO~2)s where x = 50 to 99 mol%, y = 1 to 50 mol%, z = 0 to 20 mol%, and b) from 20 to 80 % by weight, based on the copolymer total weight, of an organic-polymer shell of mono-or polyethylenically unsaturated monomersr and R being a~ defined above.
The finely d.i~ided graft copolymers preferably have a mean particle diameter of from 10 to 300 nm, part:icularly preferably from 30 to 150 nm. The particle sizes may f luctuate withi~ thLe abovementioned rc~Lge;
preferably, a ml~n-~m~dal particle-size di~tribution is prese~lt with a m~Y~mt~m polydisper6ity index of t~2 = 0.2.
The radicals R are pref eraLbly alkyl radicals, 5 8UC~L a8 the methyl, ethyl, n-propyl, isopropyl, D.-butyl, sec-butyl, amyl, hexyl radical; ~1 kenyl radicals, such as the ~rinyl, allyl, butenyl aDd l-hexenyl radical; aryl radicals, such as the phenyl radical; or substituted ~ hydro~_arbon radicals, such as halogenated hydrocarbon 10 radicals, mercaptoalkyl radicals, cya~Loalkyl radicals, ~m; noaLlkyl radicals, acyloxyalkyl radicals, hydroxyalkyl radici3Lls .
Particularly pre$erred radicals are methyl, ethyl, propyl, phenyl, vi~yl, allyl, 1-hexenyl, 3-meth-15 acryloxypropyl arLd 3-mercaptopropyl, less than 30 mol%
of the radicals in the siloxane polymer being vinyl, 3-methacryloxypropyl or 3-mercaptopropyl groups.
Monomers employed for the orga~Lic polymer compo-nent b) are preferably acrylates ~r methacrylates and 20 morLo- or diesters of fumaric and maleic acid with aliphatic alcohols a~Ld diols having 1 to 10 carbon atoms, acrylamides and methacrylamides, acrylonitrile, styrene, p-metilylstyresLe, a-methylstyrene, diviDIylbenzene, vinyl acetate r ViILyl propionate, 25 maleimide, vi~Lyl chloride, mono- and divinyl ethers, ethyle~Le, butadiene, isoprene and chloroprene.
Particular prefere~ce is given to styrene a~Ld to acryl.ates and methyacrylates of aliphatic alcohols haviD.g 1 to 4 carbon atoms, for exa~cLple methyl 30 (meth) acrylate, butyl (meth) acrylate a~Ld glycidyl (meth) acrylate . Both homopolymers and copolymers of the abovementioned mono~m~rs are suitable as organic polymer c ompoD en t .
The polysil ~xane graf t base is prepared 35 according to the emulsion polymerization process by meterirlg in the corresponding mixture of monomeric siianes of the type R~,Si (OR ) 4,," where a = O, 1 or 2, or, if desired, low molecular mass siloxanes of the general formula (R2Sio)l where n = 3 to 8, to an agitated emul~:ifier/water mixture. The radical R has the defi~:itions already given. R' repre~ents alkyl radicals ha~ing 1 to 6 carbon atoms, aryl radicals or substituted hydrocarbon radical~, with methyl, ethyl and propyl radicals being preferred. The silane or the silane mixtu:re or silane/siloxane mixture i8 added ln metered form. The emulsion polymerization is carried out at a temperature of from 30 to 90~C, preferably from 60 to 85~C, and preferably at atmospheric pressure. The p~ of the polymerization mixture is from 1 to 4, preferably from :2 to 3.
~ Examples of suitable silanes are, for silanes of the general formula R2Si(OR') 2~ dimethyldiethoxysilane or dimet:hyldimethoxysilane; for oligomers of the formula (~SiO)~ where n = 3 to 8, octamethylcyclotetrasiloxane or heY~ethylcyclotr.isiloxane; for silanes of the general formula RSi(OR') 3, methyltrimethoxysilane, phenyltriethoxy~ilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane or methacryloxypropyl-20-trimethoxysilane, and, for silanes of the general formula Si(OR')~, tetramethoxysilane or tetraethoxy-silane.
In the last step of the preparation process the abo~ementioned ethylenically unsaturated monomers are grafted onto the poly~iloxane graft base. Grafting takes place according to the emulsion polymerization process in the presence of water-soluble or monomer-soluble free-radical initiators. The graft copolymers can be isolated from the emulsioD. by known methods. For example, by coagulating the latices by means of salt addit.ion or addition of polar sol~ents or by spray drying .
The degree of crosslinking of the silicone core deter~ines its elastic properties and can be established speci.fically in a manner familiar to the person skilled in the art by an appropriate choice of the starting components, corresponding alko~silanes and/or silcxanes in order to obtain nnits (RSio;/2) and/or (SiO4~2). The incorporation of silane units comprising olefinically unsatu:rated doubl~ bond~, for p~rlq ~inyl radical-~ or 3-m~thacryloxypropyl radicals, permits, in the subseq~ent graft polymerization, a chemical ~n~ing Of the organic-polym~r ~hell to the silicone core by coval~:nt bond~. By choosing ~uitable mo~L~ -~ for the synthesis of the organic polymer ~hell b) it i~ possible - to tailor the organic-polymer ~hells. Thus by grafting a copoly~Ler sh-ll comprising, for examplo, methyl methacrylate (high Tg) and n-butyl acrylats (low Tg) onto ;~L crossl;n~~~ silicone core it is possible to e~tablish ~ fically the soft~n;n~ t~m~srature of the polymer shell and thereby to m~tch it exactly to the roquirement during processing, esp~ ly extrusion, of the ~o~Jd r coating ~ ~t~. By grafting a copolymer shell comprising, for example, m~thyl methacrylate and glycidyl methacrylate onto a crossl~n~e~ silicone core, on thL~ one hand it is pos ible, owing to the epoxide function~ in the organic-polymer shell which are introduced with glycidyl methacrylate, to obtain a matrix attachment between modifier particles and binder resin of the powder coating composition, and on the other hand these modifier particles are able to act as crosslinking agents in binders based on polyester reslns.
The mo~t preference, accordingly, i~ for cross-linked. silicone ela~tomer particles ~ith a core compri~ing (R2SiO2/2)y(RSiO3/2)y where x = 80-99 mol% and y = 1-20 mol%, R being able to be identical or different and ha~ing the definition R = methyl, 3-methLacryloxy-propyl., a~d withL a shell of poly~methyl methLacrylate) or copolymer ~hells of methyl methacrylate and butyl acrylal.te or glycidyl methacrylate.
The proportion of tkLe core polymer, ba-~ed on the total copolymer weight., is particularly preferably 50-75 ~ by weight, and accordingly the proportion of theorgani.c-polymer ~hell i~ particularly preferably 25-50 %
by ~ei.ght. This correqpond-R to an organic-polymer degree of graLfting of 33-100 ~I.
The additi~e nature of t}.Le silicone ela~tomer par~ i c l ~ ~rith an organic-polymer sh~ll and the ease of incorE~oration by compo~n~l; n~ 1 -r~; t u~e with all common bincles systems for ~o~ r coatings . Examplos of hi n~
~ y:~t~ls for ~o~ r coating~ are epoxy r-sins, epoxy-5 novolak r~ins, poly-ster resins, ~G~y polye ter re~in~l, polyest-r hybrid r-sins, polyacrylate resins, polymelthacrylate resins, polyurothane re ~in-l, polyet hyl--n-- resins (~D-PE, ID-PE, I~-PE), poly~. ~.~ylen-- re in~ ~ poly~rinyl chloride re~ins, 10 ethyleme/~rinyl acotate copolymers, polya~i ~ nd cellulos- ester~.
Th- Si 1 i ~o--~ elastomer particlos with an organi.c-polymer sh~ll are generally added in a quantity of frem 0 . 5 to 20 % by weight, preferably from 1. 0 to 15 10 9~ by ~eight, ba~ed in each ca~e on the total weight of the silicone elastomer component and binder comror-s~ t .
Th~ oi.licone ola~tomer pArticles with an organic-polymer shell can be processed to powder coatings after 20 pr ~ i ~ i ng with binder, pigments and further additives, ror example ha dersr, by extrusion or comparable ~; Y; ng proce~ es in a temperature range from 5 to 160 CC f preferably from 60 to 110~C. Thi~ corresponds to the customary procedures for preparing powder coatings.
25 Com ni nution, grinding nd sieving can be carried out in accordance with the state of the art.
In general, the procedure i-- such that the binder . - - t i9 pree~ uted and is ~i Y~l inten li~ely with the ~ilicone elastomer particles, with 30 pigments, catalysts and additi~res, for example in fluid mixer-~. The composition pas ie~ ~ria a metering de~ice into an extruder, i - which the material is melted and homog~nized at temperatures which lie above the sof t~ n~ point of thH binder and below the acti~ration 35 temper.ature of the cros li nki ~Ig catalyst ~hardener) . The extrucled pastelike ;~terial emerges from the extruder ciie and i-l then rolled out by rollers to a layer thicknes ~ of from 2 to 3 mm coolet comminuted and finely ground; fin~lly the powder ia sie~ed to the d sirs~d partiele size.
Thq ~o~ eoating eompositions ob~-ina~le in this ~ay ean b~ proces~ed u~ing tho application m~thods whieh are known for ~ou'- r eoating~, for example by the elcetro tatie ~y a~ing, eleetrostatie eoating, tr~ tric and corona processQs, fluidized-bed sintering, electsostatic fluidized-bed -qintering, bulk sintering and eentrifugal ea ting. A eommon feature of all ~:intsring method~ is that th- material is melted under the influ~nee of heat during film fosmation; in th~ eaQe of thermo~etting plastie~, this i9 then additionally followed by a euring eyele. A eo ,on f-ature of the eleetrostatie applieation m~thods is that thQ ~t~ ,e r is generally appli~d to a eold, earthed ba~e material. O~ing to thei.r eleetrostatie eharge the powder partiel~s adhere to the workpiec~, whieh i~ then heated in an o~en, wheroby th~ partieles melt and - in the c~ae of cura~le polym~rs - are cured.
The powder coating compoaition according to the invent.ion i~ ~uitable for all powder coating applica-tions, for exampls metallie fin;~hi~ in the automotiYe ~ector (clearco~t, topcoat, interior finish, filler, stone-chip protection and ~ hody protection), of rail-bound ~ehiclea and aircraft (exterior finish), domest.ic appliances ~for example chest freezera, refrigerators, dishwa~hers), architoctural componenta both l~xternal (windo~ frames, exterior panela, doors, gates) and internal ~metal furnituro, lamp housings), bicyel.os, nowmobile~, shipping eontaine~ igns, aluminium wheel rim~.
In the powder eoating composition~ according to the i.nvention, the required criterion of microphase separa.tion for improving the impact strength in thermoplastics a~d thermoset~ while at the ~ame time retaining the existing polymer properties such as hard-ness d~men~ional Ytak~ility and mechanlcal ~trength is met. .In adc~tion to an. improvement in the (low-tempera-ture) impact strength, the powder coating compositions also achie~e, for example, impro~ed gloss retention (weath-~ring r~sistance) and scratch reQistanca, with no ad~-rs-- ~ffect on hardne~s, ~ ional st~h;lity and me~h~nit~-l strength. The ~il içon~ ela~tomer particle~
with ~n organic-polym~r ~hell can b- incorporated (com-po~ t) as formulation constituents into powd~r co~ting~- r~:itions ~imply and without problem~ in accordance with co~.~,~..tional proces- t~hn;~ueQ. ContAm;n~tion probl~ and flow defscts do not occur. O~ercoatability 'of the re ulting powder coatings i~ pro~ided.
The te t results in the examples which follow tl~ ~n~trat- th~t th- ~ mpact) tolghn-~s of the powder coatin~s, e~en at low temperatures, i~ improved by the addition or s;l;~ ela~tomer particles ~ith an organic-polym r ~hell ~ithout any ad~erse effect on the ~5 hardne~s and adhe~io~ of the powder coatingV In a~ tion, the woathering re~istance i~ also improved.
Exa~plle-~:
Example~ 1 - 2 Compari~on Example 1 (Tablo 1):
A carboxyl-contAi n- nt polye~ter powder coating ~baqed on Uralac DSM) was mixed with 10 % by ~eight ~Example 1) 3 % by weight (Example 2) and 0 % by weight ~Comp Ex ll of silicone particle~ with a core compri~-ing (R2SiO2~2)~R~SiO3J2)y ~x = 95 mol% y ~ 5 mol%; R =methyl R = methyl 3-methacryloxypropyl) and a poly-methyl methacrylate ~hell ~PNM~ degree o~ grafting 50 %
by weight pr;m~ry particle size 100 nm) and t~e mixture was extruded (extruder: MP 2000PC APV-Baker) ground ~ie~sd and then appli~d to aluminium panels or metal pan~l by spraying with a powd~r handgun (ESB Integral 2020 Wagner) The ~ n~ operation wa-~ carried out at 200~C for 10 minute~ Tho te~t re~ult of the powder coatings are compiled in Table 1 In addition to the test ~tandards indicated in the tabl~ the follo~ing test methods were employed ~he Rlinig pendulum hardnQss wa~ tested in accor~ce with DIN 53137 The rever3e impact wa~ determined by ball i~pact testing ~ 11 ~
with tho Erich-~en ~all impact te~ting ins~trument model 304.
The c:ros~-hatch ~as dete.-m;ned u~ing the method according to DIN 53151.
They show that the to~l~hns~ (rever~e impact) and aclhesion (cro~s-hatch, h~;d climatic conditions) ~ are in~provod by at1~;n7 the silicono elastomer powder with a PMMA shell; th- hardnes~ i~ not adversely affectlsd. The mea~urem~nt~ of the reduction in glosq after 2000 hour~ of Q W -B weathering (triple-region glo~ meter, Dr. ~ange) ga~e, for the powder coating from C~r~ri~on r~ 1 in ~mp~i on with the powder coating from Example 1, a reduction in glo-~ which wa~
hi~r by 200 %. Th~ resistance of the powder to Q W-B
weathe:ring is likewi~ impro~ed by at~ ng the silicone elasto~er particles with an organic-polymer shell.
Exampl~e 3:
An acrylato powder coating (based on Alftalat, ~oech-~t) wa~ ~;Y~A with 2 % by weight, 5 % by weight and 10 % by weight of ~ili.cone particle~ as in Example 1-2 and the mixtur~ was extruded textruder: Moe 2000PC, APV-Baker) ground, sieved and then applied to aluminium panel~ or metal panels by 3praying with a powder handgun (ESB Integral 2020, Wagner). The baking operation was carried out at 160~C ~or 20 minutes. Tho mQasurement results (at -20~C) qhowed that with an increasing quantity of silicone elastomer particles with a ~MM~
sholl, from 2 % by weight to 10 % by weight, the rever~e impact ~alue roso by 50 %.
Example 4:
An epoxy re~in powder coating (ba~ed on Araldite, Ciba Geigy) was mixed with 5 % by weight and 10 % by weight of silicone part~cles as in Example 1-2 and t~e mlxture wa~ ext~ ded ~extruder ZS~ 25~ Werner ~
Pfleiderer) and then applied to metal panels by ~praying with a powder handgun (Mars II P~-6, Bollhofer) The baking operation was carried out at 180~C for 10 CA 02232067 l998-03-l3 minut s The mea~urement result~ sho~ed that ~ith an a~ition o~ olastom r ~articlos ~ith a PMM~
sh-ll of 5 % by ~eight and 10 % by ~ight the rever~e i~pact ~aluo in~ s by 10 % and 40 % re~pecti~oly At th- ~me t~me, the stone-chip ro~i~tance ~as i~lovel CA 02232067 l998-03-l3 S~l~ 1:
Co~p ~Y~3p~ a~pl~ 2 ~Ya~pl- 1 Propor~ on Or ~ O ~ by ~t 3 ~ by ~t10 ~ by vt olaJtosu~r povd~r vlth a PM~A
uh ll Avorag ~ rh;~ a2 ~o +- 6 ~n 83 ~c +- 4 ~ 80 ~m +- 11 ~m ~~onig i ~ 14~ 1~6 135 P ncil ~ ~~~ 5R 5H 5~
Mi~ dou~ rub- >200 >200 >200 RJvor-- impact in ~ LbJ 70 80 ag T-b nd ~ ~ ~
9alt rpray t-ating ~ - ng to 99 DrN 50 021 T--t dhration 263 hour~
Croo--hltch ~ithout adh -iv Ct ~ Ct 1 Ct 1 t p-Crooo-h tch ~ath adhooiYa t~p~ ce 1 Ct 1 Ct 1 Dogruff o~ ru~t ng according to R 3 Rl 3 ~1 3 DIN 53 'lO
D~gr- oi bli~t ring --o r~i ng no no no to Dr~ !j3 209 Ru~t (G ~ 3 3 2 8umld cli tc - ng to 5~ DrN 50 017 Toot duration 640 hour~
Cro-o-hltch ~ithout dh-~iv- Ct 4 Ct 2 Ct 0 tap C~o~J-hlt~h ~itb adh-oiva tap Ct S Gt 3 Gt 0
Claims (7)
1. Use precrosslinked silicone elastomer particles with an organic-polymer shell as formulation constituent in powder coating compositions based on thermoplastic or thermosetting binders, the silicone elastomer particles comprising a) from 5 to 95 % by weight, based on the total weight of the copolymer, of a core polymer of the general formula (R2SiO2/2)x'(RSiO3/2)y~(SiO4/2)z where x = 5 to 99.5 mol%, y = 0.5 to 95 mol%, z = 0 to - 30 mol%, and b) from 5 to 95 % by weight, based on the total weight of the copolymer, of an organic-polymer shell of mono- or polyethylenically unsaturated monomers, and R denoting identical or different monovalent alkyl or alkenyl radicals having 1 to 6 carbon atoms, aryl radicals or substituted hydrocarbon radicals.
2. Powder coating compositions based on thermoplastic or thermosetting binders which comprise as formulation constituent precrosslinked silicone elastomer particles with an organic-polymer shell the silicone elastomer particles comprising a) from 5 to 95 % by weight based on the total weight of the copolymer, of a core polymer of the general formula (R2SiO2/2)x~(RSiO3/2)y~(SiO4/2)z where x = 5 to 99.5 mol%, y = 0.5 to 95 mol%, z = 0 to 30 mol%, and b) from 5 to 95 % by weight, based on the total weight of the copolymer, of an organic-polymer shell of mono- or polyethylenically unsaturated monomers, and R denoting identical or different monovalent alkyl or alkenyl radical having 1 to 6 carbon atoms, aryl radicals or substituted hydrocarbon radicals.
3. Claim 1 or 2, in which the precrosslinked silicone elastomer particles with an organic-polymer shell comprise a) from 20 to 80 % by weight, based on the copolymer total weight, of a core polymer (R2SiO2/2)x~(RSiO3/2)y~(SiO4/2)z where x = 50 to 99 mol%, y = 1 to 50 mol%, z = 0 to 20 mol%, and b) from 20 to 80 % by weight, based on the copolymer total weight, of an organic-polymer shell of mono- or polyethylenically unsaturated monomers, and R being as defined above.
4. Claim 1 or 2, in which the precrosslinked silicone elastomer particles comprise a core comprising (R2SiO2/2)x~(RSiO3/2)y where x = 80-99 mol% and y =
1 - 20 mol%, R being able to be identical or different and having the definition R = methyl, 3-methacryloxypropyl, and with a shells of poly(methyl methacrylate) or compolymer shells of methyl methacrylate and butyl acrylate or glycidyl methacrylate.
1 - 20 mol%, R being able to be identical or different and having the definition R = methyl, 3-methacryloxypropyl, and with a shells of poly(methyl methacrylate) or compolymer shells of methyl methacrylate and butyl acrylate or glycidyl methacrylate.
5. Claim 1 to 4, in which the precrosslinked silicone elastomer particles with an organic-polymer shell have a mean particle diameter of from 10 to 300 nm.
6. Claim 1 to 5, in which the precrosslinked silicone elastomer particles with an organic-polymer shell have a monomodal particle-size distribution with a maximum polydispersity index of .sigma.2 = 0.2.
7. Claim 1 to 6, in which the precrosslinked silicone elastomer particles with an organic-polymer shell are present in the powder coating composition in a quantity of from 0.5 to 20 % by weight, based in each case on the total weight of silicone elastomer component and binder component.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19535824A DE19535824A1 (en) | 1995-09-26 | 1995-09-26 | Pre-crosslinked silicone elastomer particles with an organopolymer shell as a formulation component in powder coatings |
| DE19535824.4 | 1995-09-26 | ||
| PCT/EP1996/004208 WO1997012005A1 (en) | 1995-09-26 | 1996-09-26 | Precross-linked silicone elastomer particles with organopolymer shell as formulation constituent in powder coating materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2232067A1 true CA2232067A1 (en) | 1997-04-03 |
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ID=7773249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002232067A Abandoned CA2232067A1 (en) | 1995-09-26 | 1996-09-26 | Precrosslinked silicone elastomer particles with an organic-polymer shell as a formulation constituent in powder coatings |
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| US (1) | US5981659A (en) |
| EP (1) | EP0852610B1 (en) |
| JP (1) | JP3299972B2 (en) |
| KR (1) | KR100275285B1 (en) |
| CN (1) | CN1070902C (en) |
| AT (1) | ATE180506T1 (en) |
| AU (1) | AU705522B2 (en) |
| BR (1) | BR9610711A (en) |
| CA (1) | CA2232067A1 (en) |
| CZ (1) | CZ288425B6 (en) |
| DE (2) | DE19535824A1 (en) |
| DK (1) | DK0852610T3 (en) |
| ES (1) | ES2134008T3 (en) |
| NO (1) | NO981330L (en) |
| PL (1) | PL184033B1 (en) |
| RU (1) | RU2152969C1 (en) |
| SK (1) | SK33998A3 (en) |
| TW (1) | TW399089B (en) |
| WO (1) | WO1997012005A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6861475B2 (en) * | 2002-10-16 | 2005-03-01 | Rohm And Haas Company | Smooth, flexible powder coatings |
| DE102004047708A1 (en) * | 2004-09-30 | 2006-04-06 | Wacker Chemie Ag | Core-shell particle-containing composition and its preparation |
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| KR100646939B1 (en) * | 2005-08-29 | 2006-11-23 | 삼성에스디아이 주식회사 | Thin film transistor and method thereof |
| CN101517029B (en) * | 2006-07-31 | 2013-10-16 | 汉高股份及两合公司 | Curable epoxy resin-based adhesive compositions |
| CN101547990B (en) | 2006-10-06 | 2012-09-05 | 汉高股份及两合公司 | Pumpable epoxy paste adhesives resistant to wash-off |
| JP5409373B2 (en) | 2006-11-13 | 2014-02-05 | ヘンケル コーポレイション | Benzoxazine composition having core-shell rubber |
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| WO2008085286A1 (en) * | 2006-12-19 | 2008-07-17 | Henkel Corporation | (meth)acrylate compositions containing dispersions of core shell rubbers in (meth)acrylates |
| KR101543807B1 (en) * | 2006-12-19 | 2015-08-11 | 헨켈 아이피 앤드 홀딩 게엠베하 | Cyanoacrylate compositions containing dispersions of core shell rubbers in methacrylates |
| DE102007024967A1 (en) * | 2007-05-30 | 2008-12-04 | Wacker Chemie Ag | Reaction resins containing core-shell particles and process for their preparation and their use |
| DE102007058713A1 (en) | 2007-12-06 | 2009-06-10 | Evonik Goldschmidt Gmbh | Silicone (meth) acrylate particles, process for their preparation and their use |
| US7847034B2 (en) * | 2008-03-20 | 2010-12-07 | Loctite (R&D) Limited | Adducts and curable compositions using same |
| DE102008023076A1 (en) * | 2008-05-09 | 2009-11-12 | Henkel Ag & Co. Kgaa | Polymerizable composition |
| EP2135909B1 (en) | 2008-06-12 | 2018-01-10 | Henkel IP & Holding GmbH | Next generation, highly toughened two part structural epoxy adhesive compositions |
| US8309633B2 (en) * | 2008-07-17 | 2012-11-13 | Henkel Ireland Ltd. | Low temperature, cationically curable compositions with improved cure speed and toughness |
| CN102471651B (en) | 2009-07-08 | 2013-07-17 | 汉高股份有限及两合公司 | Electrically conductive adhesives |
| AU2010286611B2 (en) | 2009-08-31 | 2013-07-11 | Cytec Technology Corp. | High performance adhesive compositions |
| DE102010001528A1 (en) | 2010-02-03 | 2011-08-04 | Evonik Goldschmidt GmbH, 45127 | New particles and composite particles, their uses and a new process for their preparation from alkoxysilyl-bearing alkoxylation products |
| HUE037316T2 (en) | 2010-09-15 | 2018-08-28 | Henkel IP & Holding GmbH | Two-part, cyanoacrylate/cationically curable adhesive systems |
| EP2895564A2 (en) * | 2012-09-17 | 2015-07-22 | 3M Innovative Properties Company | Powder coating epoxy compositions, methods, and articles |
| US8981027B2 (en) | 2013-03-15 | 2015-03-17 | Henkel IP & Holding GmbH | Two-part, cyanoacrylate/cationically curable adhesive systems |
| JP6435691B2 (en) * | 2014-07-28 | 2018-12-12 | 富士ゼロックス株式会社 | Thermosetting powder coating, manufacturing method of thermosetting powder coating, coated product, and manufacturing method of coated product |
| DE102014226826A1 (en) | 2014-12-22 | 2016-06-23 | Henkel Ag & Co. Kgaa | The epoxy resin composition |
| CN108148160B (en) * | 2017-12-05 | 2020-06-09 | 宜宾天原集团股份有限公司 | Preparation method of silicon-containing vinyl chloride copolymer |
| CN108129613B (en) * | 2017-12-05 | 2020-06-09 | 宜宾天原集团股份有限公司 | Preparation method of chloroethylene copolymer containing silicon core-shell structure |
| GB2576792B (en) | 2018-08-13 | 2022-09-14 | Henkel Ag & Co Kgaa | A two-part cyanoacrylate curable adhesive system |
| GB2576791B (en) | 2018-08-13 | 2022-09-14 | Henkel Ag & Co Kgaa | A two-part cyanoacrylate curable adhesive system |
| GB2582537B (en) | 2019-03-04 | 2022-02-23 | Henkel IP & Holding GmbH | Two-part, cyanoacrylate/cationically curable adhesive systems |
| EP3825355A1 (en) | 2019-11-22 | 2021-05-26 | Henkel AG & Co. KGaA | High glass transition temperature formulations for laminates |
| TW202219214A (en) | 2020-08-27 | 2022-05-16 | 德商漢高股份有限及兩合公司 | Electrically conductive one component (1k) epoxy formulation |
| CN112391027A (en) * | 2020-12-10 | 2021-02-23 | 会通新材料股份有限公司 | Scratch-resistant ABS material and preparation method and application thereof |
| WO2024003053A1 (en) | 2022-06-28 | 2024-01-04 | Henkel Ag & Co. Kgaa | Method of underwater bonding |
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| JPH05209149A (en) * | 1991-11-07 | 1993-08-20 | Takemoto Oil & Fat Co Ltd | Coating composition |
| CA2084534A1 (en) * | 1991-12-30 | 1993-07-01 | Donald T. Liles | Polystyrene modified with silicone rubber powder |
| JPH05263037A (en) * | 1992-03-18 | 1993-10-12 | Toray Ind Inc | Coating composition |
| US5280098A (en) * | 1992-09-30 | 1994-01-18 | Dow Corning Corporation | Epoxy-functional silicone resin |
| JPH06256717A (en) * | 1993-03-05 | 1994-09-13 | Showa Denko Kk | Matte coating composition |
| US5587424A (en) * | 1993-06-22 | 1996-12-24 | Bayer Aktiengesellschaft | Mixture of fluorocarbon rubber and silicone/acrylate core/shell rubber |
| JPH07188355A (en) * | 1993-12-28 | 1995-07-25 | Showa Highpolymer Co Ltd | Curable composition |
| JPH07286129A (en) * | 1994-04-18 | 1995-10-31 | Japan Synthetic Rubber Co Ltd | Aqueous dispersion for coating |
| JP3479563B2 (en) * | 1994-09-20 | 2003-12-15 | 三菱レイヨン株式会社 | Resin composition for paint and method for producing the same |
| JPH08100035A (en) * | 1994-09-28 | 1996-04-16 | Showa Denko Kk | Water-base emulsion and its production |
| JPH08134153A (en) * | 1994-11-07 | 1996-05-28 | Hitachi Chem Co Ltd | Graft copolymer, its production, weakly water-soluble resin composition and coating compound |
| JP3519504B2 (en) * | 1995-07-06 | 2004-04-19 | 三菱レイヨン株式会社 | Composite rubber-based graft copolymer, method for producing powder thereof, and thermoplastic resin composition thereof |
-
1995
- 1995-09-26 DE DE19535824A patent/DE19535824A1/en not_active Withdrawn
-
1996
- 1996-08-21 TW TW085110224A patent/TW399089B/en not_active IP Right Cessation
- 1996-09-20 ZA ZA967978A patent/ZA967978B/en unknown
- 1996-09-26 US US09/029,552 patent/US5981659A/en not_active Expired - Fee Related
- 1996-09-26 JP JP51314597A patent/JP3299972B2/en not_active Expired - Fee Related
- 1996-09-26 CA CA002232067A patent/CA2232067A1/en not_active Abandoned
- 1996-09-26 RU RU98107839/04A patent/RU2152969C1/en active
- 1996-09-26 KR KR1019980701919A patent/KR100275285B1/en not_active IP Right Cessation
- 1996-09-26 DK DK96933401T patent/DK0852610T3/en active
- 1996-09-26 AT AT96933401T patent/ATE180506T1/en not_active IP Right Cessation
- 1996-09-26 ES ES96933401T patent/ES2134008T3/en not_active Expired - Lifetime
- 1996-09-26 SK SK339-98A patent/SK33998A3/en unknown
- 1996-09-26 PL PL96325969A patent/PL184033B1/en unknown
- 1996-09-26 CN CN96196234A patent/CN1070902C/en not_active Expired - Fee Related
- 1996-09-26 AU AU72150/96A patent/AU705522B2/en not_active Ceased
- 1996-09-26 BR BR9610711A patent/BR9610711A/en active Search and Examination
- 1996-09-26 CZ CZ1998925A patent/CZ288425B6/en not_active IP Right Cessation
- 1996-09-26 EP EP96933401A patent/EP0852610B1/en not_active Expired - Lifetime
- 1996-09-26 WO PCT/EP1996/004208 patent/WO1997012005A1/en active IP Right Grant
- 1996-09-26 DE DE59602023T patent/DE59602023D1/en not_active Expired - Fee Related
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1998
- 1998-03-24 NO NO981330A patent/NO981330L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| US5981659A (en) | 1999-11-09 |
| TW399089B (en) | 2000-07-21 |
| RU2152969C1 (en) | 2000-07-20 |
| WO1997012005A1 (en) | 1997-04-03 |
| ZA967978B (en) | 1997-03-26 |
| PL184033B1 (en) | 2002-08-30 |
| NO981330D0 (en) | 1998-03-24 |
| KR100275285B1 (en) | 2000-12-15 |
| CN1070902C (en) | 2001-09-12 |
| JP3299972B2 (en) | 2002-07-08 |
| DE19535824A1 (en) | 1997-03-27 |
| AU705522B2 (en) | 1999-05-27 |
| DK0852610T3 (en) | 1999-11-08 |
| ES2134008T3 (en) | 1999-09-16 |
| EP0852610B1 (en) | 1999-05-26 |
| SK33998A3 (en) | 1998-08-05 |
| NO981330L (en) | 1998-03-24 |
| KR19990044665A (en) | 1999-06-25 |
| AU7215096A (en) | 1997-04-17 |
| ATE180506T1 (en) | 1999-06-15 |
| CN1192767A (en) | 1998-09-09 |
| BR9610711A (en) | 1999-07-13 |
| EP0852610A1 (en) | 1998-07-15 |
| JPH11500175A (en) | 1999-01-06 |
| DE59602023D1 (en) | 1999-07-01 |
| CZ288425B6 (en) | 2001-06-13 |
| CZ92598A3 (en) | 1998-06-17 |
| PL325969A1 (en) | 1998-08-17 |
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