CA1185961A - Components and catalysts for the polymerization of olefines - Google Patents

Components and catalysts for the polymerization of olefines

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Publication number
CA1185961A
CA1185961A CA000383700A CA383700A CA1185961A CA 1185961 A CA1185961 A CA 1185961A CA 000383700 A CA000383700 A CA 000383700A CA 383700 A CA383700 A CA 383700A CA 1185961 A CA1185961 A CA 1185961A
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Prior art keywords
carbon atoms
dihalide
polymerization
olefins
component
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CA000383700A
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French (fr)
Inventor
Roberto Nocci
Umberto Scata
Pier C. Barbe
Umberto Giannini
Sandro Parodi
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Montedison SpA
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Montedison SpA
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Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/02Carriers therefor
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/64Titanium, zirconium, hafnium or compounds thereof
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Abstract

ABSTRACT OF DISCLOSURE
Disclosed are catalysts for the polymerization of alpha-olefins which comprise the reaction product of:
(a) an Al alkyl compound;
(b) a silicon compound containing at least a Si-OR or Si-OCOR or Si-NR2 bond, R being a hydrocarbyl radical;
(c) a solid comprising, as essential support, a My dihalide in active form and, supported thereon, a Ti halide or a halo-Ti-alcoholate and a particular, selected type of electron-donor compound.

Description

DESCRIPTION
The present invention refers to new suppor-ted components of ca-talysts for the polmeriza-tion of CH2=C~IR
olefi.ns wherein R is an alkyl radical with 1 to 4 carbon atoms, or an aryl raclical, and mixtures of said olefins with e-thylene;
and the catalysts obtained from said components.

BACKGROUND OF THE IN~EMTION
The supported highly active and highly s-tereospecif~c catalysts for the polymerization of propylene and higher olefins 1.0 known up to ~ow are obtained by the reaction of an Al alkyl compound partially complexed with an electron-donor xlt~

compound (outside donor) with a solid component comprisiny a Ti compound and an electron~donor compound (inside donor) supported on a Mg dihalide in active form.
Examples of such catalysts have been described in British Patent No. 1,559,194 and selgian Patent No. ~68,682.
Outside donors consistiny oE silicon compounds con-taining Si-O-C bonds have been described, also, in published Japanese patent applications Sho 79/94590 and Sho 80/36203.
Among the various and numerous inside donors such compounds as methylmethacrylate and ethyl pivalate have been cited.
However, in all the prior art catalysts in which a silicon compound containing Si-O-C bonds is Ised as outside donor, esters of benzoic acid and derivatives thereof are used as inside donor.
The performance of the above catalysts, expressed in terms of activity and stereospecificity,is not different from the perEormance of the catalysts in which ethyl benzoate and similar esters of benzoic acid are used as outside donor.

éJ0 T~IE PRESENT INVENTION

One object of -th.is invention is to provide improved catalyst-formin~ components which result in final catalysts exhibiti.ny increased activity and stereospecificity in the polymerization of ~-olefins and in which the inside donor is an ester different from esters of benzoic acid or of derivatives thereof.
This and other objects are achieved by -this inven-tion in accordance with which, une.~pectedly, i-t has been ~Eound that it is possible to increase the activity and s-tereospeci~icity ~s~

of the prior art supported catalysts comprising, as outside donor, a silicon compound containing Si-O-C bonds, by using as inside donor selected esters having a particular structure.
The catalysts of this invention comprise the product of reaction between the following components:
(a) an Al trialkyl or an Al alkyl compound containing
2 or more aluminum atoms linked to each other through oxygen or nitrogen atoms or through SO4 or SO3 groupsi (b) a silicon compound containing one or more Si-oR, Si-OCOR or Si-NR2 bonds (R being a hydrocarbyl radical);
(c) a solid comprising, as essential support, an anhydrous Mg dihalide present in active form and, supported on said dihalide, a Ti-halide or a Ti-haloalcohola-te and an electron-donor compound selected from the following groups of compounds:
(1) mono and diesters of aromatic dicarboxylic acids having the COOII groups in ortho position, wherein the R hydrocarbyl radicals of the COOR groups contain less than 3 carbon atoms and at least one of said R radicals contains 2 carbon atoms;
(2) esters of saturated and unsaturated carboxy-lic acids of formula RCOOR' wherein the R
hydrocarbyl radical is either a saturated or unsaturated branched radical containing from
3 to 20 carbon atoms or an arylalkyl radical with 7 to 20 carbon atoms or an aryl radical 3~ with 3 to 20 carbon atoms linked to the esteric carbonyl group directly or through a methylene group and in which R' is a hydro~
carbyl radical with less than 3 carbon atoms.
~epresentative compounds, which are also the preferred compounds, are the following: diethylphthalate, methylethyl-phthalate, diethyl-2,3-naphthalendicarboxyla-te, methyl and ethyl pivalate, methyl and eth,yl methacrylate.
As indicated, the esters of the polycarboxylic acids can contain, beside the ester groups, also unestérified COOH
groups.
In preparing component (c) the esters are contacted with the active Mg dihalide, or the precursors of said dihalides as preformed compounds, or the esters can be formed in situ by means of known reactions as, for instance, by es-ter-1~; ificatlon between an alcohol or an alcoholate and an aryl halide or between an anhydride or a hemiester of a polycar-boxyLic acid with an alcohol, or by transesterification. The esters can also be used in mixture with other known inside donor .q .
2~ The active anhydrous Mg dihalides forming the eq~;entlal support oE component (c) are the Mg dihalides showing ln the X-rays powder spectrum of component (c) a broadening of at least 30~ of the most intense diffraction line which appears in thc powder spectrum of the corresponding dihalide having 2~ 1 m2/g of surface area or are the Mg dihalides showing an X-rays powder spectrum in which said most intense diffraction line is replaced by a halo with the intensity peak shifted with respect to the interplanar distance of the most intense line and/or are the Mg dihalides having a surface area greater than 3 m2/g.

, -4-~p~

The measurement of the surface area of the Mg dihalides is made on component (c) after treatment with boiling TiC14 for 2 hours. The found value is considered as surface area of the Mg dihalide.
Very active forms of Mg dihalides are those showing an X-rays powder spectrum in which the most in-tense diffraction line appearing in the spectrum of the corresponding halide having 1 m /g of surface area is decreased in relative intensity and broadened to form a halo or are those in which said most intense line is replaced by a halo having its intensity peaX
shifted with respect to the interplanar distance of the most intense line. Generally, the surface area of the above forms is higher than 30-40 m2/g and is comprised in particular between 100-300 m2/g.
~ctive forms are also those deriving from the above Eorms by heat-treatment in inert hydrocarbon solvents and showing, in the X-rays spectrum, sharp diffraction lines in place of the halos.
The sharp, most intense line of these forms shows a I)roadenillg of at least 30~ with respect to the corresponding Line oE the Mg dihalide having 1 m2/g of surface area. Pre-ferred Mg dihalides are Mg dichloride and Mg dibromide. The content in water of the dihalides is generally less than 1% by wèight.
By Ti halides or Ti haloalcoholates and esters supported on the active Mg dihalide is meant the above com-pounds which may be chemically or physically fixed on the support, and not extractable from component (c) by treatment oE
the same with boiling 1,2-dichloroethane for 2 hours.
3n Components (a), (b) and (c) are made to react with each other in any order; preferably, however, components (a) 6~L

and (b) are premixed before being contacted with component (c).
Component (c) may be premixed with either component (a) and/or (b). The pre-mixing of (a) and (b) is conduc-ted at temperatures comprised, usually, between room temperature and the temperature used in the polymerization process.
The pre-reaction of tc) and (b) may be carried out also at higher temperatures. Also, compound (b) may be incor-porated and made to react with component (c) itself. Component (b) is made to react in a molar ratio with respec-t to the halogenated Ti compound supported on component (c) of at least l and in a molar ratio with respect to the Al alkyl compound used as component (a) of less than 20 and, preferably, comprised between 0.05 to 0.3.
In component (c), the molar ratio between the Mg dihalide and the halogenated Ti compound supported thereon is comprised between 1 and 500 and the molar ratio between said haLogenated Ti compound and the electron-donor supported on tllo Mg dihcllide is comprised between 0.1 and 50.
The sillcon compounds set forth in (b) include com~ounds oE general Eormula:
RmS iYnXp t~ roin:
R is an alkyl, alkenyl, aryl, arylalkyl, cycloalkyl radical wi-th from 1 to 20 carbon atoms;
`25 Y is -OR', -OCOR' or -NR'2 wherein R', either equal to or different from R, has the same meaning as R;
X is either a halogen or hydrogen atom or a -OCOR" or -NR2" group wherein R", either e~ual to or different Erom R' has the ~ame meaning as R';

_~_ .

m, n and p are numbers comprised respectively betweeh:
m between 0 and ~, n ~etween l and 4 and p between 0 and l; and m + n ~ p is equal to 4.
Other silicon compounds that may be used are com-pounds in which two or more silicon atoms are bound to each other through oxygen or nitrogen atoms.
Examples of these compounds are hexaethoxydisiloxane, and symmetrical diphenyltetraethoxydisiloxane 2 5 )2 ~ 2 CH2 li (OC2H5)2 Preferred siIicon compounds are: phenylalkoxysilanes, such as phenyltriethoxy or trimethoxysilane, diphenyldimethoxy and diethoxysilane, monochlorophenyldiethoxysilane; alkyl-alkoxysilanes as, for instance, ethyltriethoxysilane and ~thyltriisopropoxysilane.
Exampl.es of other suitable eompounds are: ehloro-l.r.iethoxys.i.lane, acetoxytriethoxysilane, vinyl-triethoxysilane, ~ul~yltrictlloxys~ilane~ triphenylmonoethoxysilane, phenyltri-eyc;Loethoxysi.lane, phenyld:iethoxydiethylaminosilane, tetra-~0 phenoxy3.;.:Lane or tetralkoxysilanes such as tetrame-thoxysllane.
The siLiecn eompound ean also be formed in situ by ~c~action, Eor instance, oE a halogenated silieon eompound sueh as 5.i('1~ with an aleohol or an aleoholate of Mg or Al.
In the eatalysts of the invention, the silicon eom-pound i.s present, in a eombined form in the solid produet of the reaction between the various catalyst forming components, in a molar ratio between the silicon compound and the halo-genated Ti compound greater than 0.05 and generally comprised between 0.l and 5.
The Al alkyl compounds forming component (a) include A.l trialkyls as, for instanee, Al triethyl, Al triisobutyl, . -7-6~L

Al triisopropyl, and compounds containing two or more Al atoms linked to each other through hetero-atoms as:
2 5~2 ( 2 5)2; (C2H5)2Al I Al(C2H5)2; and (C2H5)2Al-O-Il O-Al(C2 5)2 As indieated, Al alkyl compounds in which A1 atoms are linked through groups such as SO4 or SO3 are also suitable.
The Al alkyl compounds may be used in mixture with Al alkyl halides, such as AlEt2C1.
Componen-t (c) is prepared aecording to known methods.
One of these me-thods consists in co-milling the Mg halide and the electron-donor compound of this invention until the appearance in the X-ray spectrum of the milled product of the odifieations set forth ahove for the spectrum of the Mg dihalide and thereafter reaeting the milled product with the L'j Ti eompound.
Preparations of this type are described in British PRt~nt No. 1~559r19~A
Simi.lar prepara-tions are described in U.S. Patents Nos. 'I,107,413, 4,107,414 and 4,107,415.
Another method consists in reacting the adduct of a M~ halid~ and an alcohol with a Ti compound in the presence of an electron-donor compound not containing aetive hydrogen atoms. This method is described in Belgian Patent No. 868,682.
Aecording to another method, which is described in published German patent applieation No. 3,022,738, -the adduet between the Mg dihalide and the aleohol is reaeted in liquid form with the halogenated Ti compound and the electron-donor eompound.

. -8-Fur-ther methods are described in published German application No. 2,924,029, USP No. 4,220,554, as well as in published ~uropean patent 29,232 (corresponding to U.S.
pa-tent 4,328,122).
Another method consists in co-milling the Mg di-halide, the halogenated Ti compound and the electron-donor compound until the Mg dihalide is activa-ted, and in treating a suspension oi the rqi~lled product in a halogenated hydrocarbon such as 1,2-dichloroethane, chlorobenzene, methylene chloride, hexachloroethane.
The treatment is carried out at -temperatures com-prised between 40C and the boiling point of the halogenated hydrocarbon for a time ranging, in general, from 1 to 4 hours.
According to another method, a porous support l:;ke sio2 or ~12O3, having a low con-tent of OH groups (pre-Ee~rab.l.y le~s than 1~ hy weight)~ is impregnated with a liquid adduc~ botween the Mg dihalide and an alcohol; the support is ~h~3n t~eated with an excess of TiC14 containing, dissolved lJh~.~ein, the el.ectron-donor compound according to the procedure le~cribed, Eor instance, in published German patent application No..3,022,738 or Belgian patent No. 868,682.
In all the above methods, the final product conta.ins a Mg dihalide, present in the active form as set forth hereinabove.
Other known methods which lead to the formation of Mg dihalide in active form or to Ti- containing Mg dihalide supported components, in which the dihalide is present in active form, are based on the following reactions:
reaction of a Grignard reagent or a MgR2 compound (R being a hydrocarbyl r~dical) or complexes of said MgR2 _ g _ m;~ht~

compounds with Al trialkyls, with halogenating agents, such as AlX3 or AlRmXn compounds (x is halogen, R is a hydroearbyl, m + n = 3), SiC14 or HSiC13;
reaction of a Grignard reagent with a silanol or polysiloxane, H20 or with an alcohol and further reaetion with a halogenating agent or with TiC14;
reaction of Mg wi-th an alcohol and a halogenhydrie aeid or of Mg with a hydrocarbyl halide and an aleohol;
reaction of MyO with C12 or AlC13;
reaetion of MgX2.nH20 (X = halogen) with a halogenat-ing agent or TiC14;
reaetion of Mg mono- or dialeoholates or Mg earboxy-lates with a halogenating agent.
The Ti halides and Ti halogenaleoholates inelude, in partieular, the Ti -tetrahalides, Ti trihalides and Ti trihalo-genaleoholates. Preferred eompounds are: TiC14, TiBr~, 2,6-climethylphenoxytriehlorotitanium.
Th~ Ti trihalides are obtained aeeording to known ~n~ ocls, for instanee by reduetion of TiC14 with Al or an c~rgclnolnetallic A1 eompound or with hydrogen.
In the ease o~ Ti trihalides, it may be convenient, ~or the purpose of improving the performanee of the catalysts, ko earry out an oxidization, even if partial, of the titanium, ei~l1er during or after the preparation of component (c). Por this purpose there may he used halogens; iodine halides.
Preferred eatalysts are those in whieh: eomponent (e) is obtained from Mgcl2~ TiC14 and diethyl phthalates or methyl or ethyl pivalates, and in which eomponent tb) is phenyl or ethyltriethoxysilane or diphenyldimethoxy or diethoxysilane.
Component ta) is an Al trialkyl such as A1 triethyl or Al triisobutyl.

.

Component (c) is prepared according the methods described in British patent No. 1,559,194, Belgian patent No.
868,~82, published German application No. 2,924,029, IJ.S.
patent No. 4,220,554, published European patent 29,232 or published German application 3,022,738.
The preferred method of preparing component tc) includes also the co-milling of MgC12, TiC14 and the ester and in treating the milled product with a halogenated hydrocarbon such as 1,2-dichloroethane.
The catalysts according to the invention are useful for polymerizing the alpha-ole~ins according to known methods that is, by carrying out the polymerization in a liquid phase, either in the presence or absence of an inert hydrocarbon solvent, or in gas phase or also by combining, for instance, a liquid phase polymerization step with a step in yas phase.
In general the polym.erization temperature is com-prised between 40 and 160C, but preferably between 60 and 90C, operating either at atmospheric or at greater than atmospheric pressure.
~s a molecular weight regulator hydrogen or other regulators oE a known type are used.
The catalysts are particularly suitable for poly-merizing propylene, butene-l, styrene, 4-methylpentene. The catalysts may also be used according to known methods to polymerize mixtures of propylene and ethylene to form modified polypropylenes having bet:ter shock-resistance at low ternpera-tures (the so-called ~lock copolymers of propylene and ethylene) or to obtain random crystalline copolymers of propylene containing minor proportions of polymeri~ed ethylene.

.

The following examples are given for merely illustra-tive purpose and are not intended to be in any way limiting of the scope of the invention.

Into a stainless stell autoclave having a total vol~e of 3 1, equipped with a magnetized stirrer and a thermo-couple heat-stabilized at 60C and kept under pressure by a nitrogen atmosphere, there were introduced 1,000 ml of a suspension of 5 mols of triethyl aluminum in degassed and anhydrous n-heptane, the phenyltriethoxysilane (PES) and a solid catalytic component prepared according to Example 1 of published European patent 29,232, but using, instead of ethylbenæoate, the esters listed in Table I, while propylene was also fed in. The catalytic components thus prepared showed X-rays powder spectrum in which the most intense diffrac-tion line appearing in the spectrum of MgC12 having 1 m /g of surface areawasdecreased in relative intensity and broadened to form a halo.
~fter closing the autoclave, hydrogen was introduced up to a pressure oE 0.2 atmospheres, the temperature was broucJht to 70C and, simultaneously, propylene was introduced up to a total pressure of 7 atmospheres.
Duris~g the polymerization, the pressure was kept constant by continuous feeding of the monomer. ~fter 4 hours, the polymerization was stopped by quick cooling and degassing oE the polymeric slurry. The polymer was separated from the solvent by filtering and was dried in a hot nitrogen flow at 70C. The quantity of polymer dissolved in the fil-trate was thereupon isolaLed, weighed and summed to the polymer soluble in boiling n-heptane, for calculation of the isotacticity index ~I.I.).

The quantity of catalytic component used and the con-tent of Ti in said component, the molar ratio of the phenyl-triethoxysilane with respect to the triethylaluminum, the yield in polymer with respect to the introduced cataly-tic component, the isotacticity index (I.I.), the surface area of the solid catalytic component and the inherent viscosity determined in tetralin at 135C, are all reported in Table I.

Example 1 was repeated but using a solid catalytic component prepared as follows:
anhydrous MgC12, an ester, listed in Table II, and TiC14 in molar ratio of 1:1 with respect to the ester, was co-ground in a vibrating mill of the type VIBRATOM manufactured by N.V. Tema's, Gravenhage, Holland, having a total volume of one liter and containing 3 kg of stainless steel balls of 16 mm diameter;
a filling coefficient equal to 100 g/g of total volume (vacuum) was used. The interior temperature of the mill was 25C, and the grinding time was 72 hours;
charging of the mi:Ll, the grinding and discharging of the mill occurred in a nitrogen atmosphere.
10 g o E the co-ground product was contacted with 100 ml o.E 1,2-dichloroethane at 80C for 2 hours. After this period, 1,2-dichloroethane was removed by filtration at 80C
Z5 and the residual solid product was repeatedly washed with n-heptane at room temperature until the chlorine ions dis-appeared from the filtrate and then was kept in suspension in heptane.
The catalytic component thus prepared gave an X-rays powder spectrum in which the most intense diffraction line *trade mark -13~

appearing in the spectrum of MgCl~ having 1 m2/~ of surface area was decreased in relative in-tensity and broadened to form a halo.
The ester, the characteristics of the solid catalytic component, and the results of the polymerizatlon test are reported in Table I.

Example 1 was repeated but using a solld catalytic component prepared according to Example 3 of published British patent 2,029,840.
A solid adduct MgC12.3C2H5OH in the form of spherical particles was slowly added to a suspension of an adduct TiC14-ester using molar ratios Mg/ester of 6 and TiC14/-C2H5O~I of 12.
The whole was heated at 100C, kept at said temperature :Eor 2 hou.rs and then filtered at 100C. The re-sulting solid product was treated with 110 ml of TiC14 at 120C
:~or 2 hours~ ~ter this period, TiC].4 was removed by filtra-tiorl and the solid was washed with n-heptane at temperatures ~0 decreasing from 90C to room temperature until the chlorine ion disappeared and then kept in heptanic suspension.
The catalytic component thus prepared gave the same X-rays spectrum as the catalytic component of Example lo The ester, the characteristics of the solid catalytic component and the results of the polymerization tests have ~een reported in Table I, n~ab/ ~

_ _ _ _ _ Example l was repeated but using the solid catalytic component prepared accordiny to Example l of published British Patent 2,029,840. The X-rays powder spec-trum was similar to that of the catalytic component of Example 1.
The results of the polymerization tests are reported in Table I.

Example 4 was repeated but using a solid cata-lytic component prepared according to Example 3 o~ published British Patent 2,029,840. The X~rays spectrum of that cata-lytic component was similar to those of Examples 1-2.
The characteristics of the solid product and the r~s~ Lts of the polymerization tests are reported in Table I.

5~
_ . _ _ ~ ~ ,, H ~) r ~ a~ ~o r . o~O ~ O ~ D O ~`J ~r H cr~

~ O O O O O C O
O ~ O ~ O O O O O O O O
3 O r r N ~ ~~ O
a) O ~ ~ o r ~ ~D ~D r u~
(~ L~l ~ ~ N ~r G' G

U~
~n~ ooooo~n~ .' N O N~1 ~i N .-1 H

a) ~ ~ ~
-IJ ~ ~ ~ ~ co o o co O C O o'l) 11) N N N N N N ~Y) .~ ~1 0 C ¦ (n ~ o r r r ~ r . ~ ~ n) ~ E
,~
r~ n~ n~
~ ~ ~ ~ r~l r1 r-l~ n~ ~ n~ c) n ~ n~
O h St ) ~1 S n~ ~. n~
u~ O ~r~ O ~ O v O
I ~ S S M r~l N N N
111 Q~
n~ nJ S a~ : ~ n~
~E~ A ~ Q ~ A
Sr~ ~ nJ ,~
~ ~ ~ O
,~,S~ S ~o ,IS,~ 1~ S
nJ ~ ~ J ~ n~ G~ n~

,~N ~') ~ C C ~) O ~`
~ 16 --~`"`` ~

Claims (6)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A solid component, to be used in combination with:
(i) an Al-alkyl or -trialkyl compound containing at least two Al atoms linked to each other through an oxygen atom, a nitrogen atom, an SO4 group or an S03 group; and (ii) a silicon compound containing at least one Si-OR, Si-OCOR or Si-NR2 bond, where R
represents a hydrocarbyl radical;
to form catalysts for the polymerization of alpha-olefins, comprising: an anhydrous Mg-dihalide in active form, as essential support; and, supported on said Mg-dihalide, a Ti-halide or Ti-haloalcoholate and an electron-donor compound selected from: methylethylphthalate, diethyl-2,3-naphthalen-dicarboxylate, diethylphthalate, methyl- and ethylmeth-acrylate.
2. A solid component as defined in claim 1, wherein said Mg-dihalide is Mg-dichloride or Mg-dibromide, said Ti-halide is Ti-tetrahalide and said electron-donor compound is diethylphthalate, methyl- or ethylmethacrylate.
3. A catalyst for the polymerization of alpha-olefins, comprising the reaction product of: components (i) and (ii), as defined in claim 1, and a solid component comprising: an anhydrous Mg-dihalide in active form, as essential support; and, supported on said Mg-dihalide, a Ti-halide or Ti-haloalcoholate and an electron-donor compound selected from:

(a) mono- and diesters of aromatic dicarboxylic acids having their -COOH groups in ortho position, wherein hydrocarbyl radicals, R, of -COOR groups contain less than three carbon atoms, and at least one of said hydro-carbyl radicals contains two carbon atoms;
and (b) esters of saturated and unsaturated carboxylic acids of general formula: RCOOR', wherein R
represents a group selected from saturated and unsaturated, branched hydrocarbyl radicals containing 3 to 20 carbon atoms, an arylalkyl radical containing 7 to 20 carbon atoms and an aryl radical containing 3 to 20 carbon atoms, and wherein R' represents a hydrocarbyl radical containing less than 3 carbon atoms.
4. A catalyst as defined in claim 3, wherein the silicon compound of component (ii) is a phenyl trialkoxy-silane, a diphenyldialkoxysilane, or an alkyl di- or tri-alkoxysilane.
5. A catalyst as defined in claim 4, wherein said solid component is as defined in claim 1 or 2.
6. A process for the polymerization of alpha-olefins of general formula: CH2 = CHR, wherein R represents an alkyl radical with 1 to 4 carbon atoms or an aryl radical, and mixtures of said alpha-olefins with ethylene, characterized in that: the polymerization process is carried out in liquid phase, in the presence or absence of an inert hydrocarbon solvent, or in gas phase, in the presence of a catalyst as defined in claim 3 or 4.
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