CA2207544C - Epdm, hnbr and butyl rubber compositions containing carbon black products - Google Patents
Epdm, hnbr and butyl rubber compositions containing carbon black products Download PDFInfo
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- CA2207544C CA2207544C CA002207544A CA2207544A CA2207544C CA 2207544 C CA2207544 C CA 2207544C CA 002207544 A CA002207544 A CA 002207544A CA 2207544 A CA2207544 A CA 2207544A CA 2207544 C CA2207544 C CA 2207544C
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- carbon black
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- epdm
- hnbr
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- 239000006229 carbon black Substances 0.000 title claims abstract description 79
- 239000000203 mixture Substances 0.000 title claims abstract description 42
- 229920005549 butyl rubber Polymers 0.000 title claims abstract description 23
- 229920001971 elastomer Polymers 0.000 claims abstract description 66
- 239000005060 rubber Substances 0.000 claims abstract description 66
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 27
- 229920006168 hydrated nitrile rubber Polymers 0.000 claims abstract description 18
- 125000000962 organic group Chemical group 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 11
- 125000000732 arylene group Chemical group 0.000 claims abstract description 10
- 125000003118 aryl group Chemical group 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 125000001140 1,4-phenylene group Chemical group [H]C1=C([H])C([*:2])=C([H])C([H])=C1[*:1] 0.000 claims description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 claims description 2
- 235000019241 carbon black Nutrition 0.000 description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 238000003756 stirring Methods 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 239000002904 solvent Substances 0.000 description 8
- 235000001508 sulfur Nutrition 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 5
- 239000012954 diazonium Substances 0.000 description 5
- ZUROCNHARMFRKA-UHFFFAOYSA-N 4,5-dibromo-1h-pyrrole-2-carboxylic acid Chemical compound OC(=O)C1=CC(Br)=C(Br)N1 ZUROCNHARMFRKA-UHFFFAOYSA-N 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- 101100431668 Homo sapiens YBX3 gene Proteins 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- 102100022221 Y-box-binding protein 3 Human genes 0.000 description 4
- 150000001989 diazonium salts Chemical class 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- -1 polybutylene Polymers 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 241000872198 Serjania polyphylla Species 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000010690 paraffinic oil Substances 0.000 description 3
- 239000012744 reinforcing agent Substances 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 3
- 229960002447 thiram Drugs 0.000 description 3
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 2
- HLBZWYXLQJQBKU-UHFFFAOYSA-N 4-(morpholin-4-yldisulfanyl)morpholine Chemical compound C1COCCN1SSN1CCOCC1 HLBZWYXLQJQBKU-UHFFFAOYSA-N 0.000 description 2
- MERLDGDYUMSLAY-UHFFFAOYSA-N 4-[(4-aminophenyl)disulfanyl]aniline Chemical compound C1=CC(N)=CC=C1SSC1=CC=C(N)C=C1 MERLDGDYUMSLAY-UHFFFAOYSA-N 0.000 description 2
- SMOYUHPSLYBFNN-UHFFFAOYSA-N 5-diazo-2-[(4-diazocyclohexa-1,5-dien-1-yl)disulfanyl]cyclohexa-1,3-diene Chemical compound C1=CC(=[N+]=[N-])CC=C1SSC1=CCC(=[N+]=[N-])C=C1 SMOYUHPSLYBFNN-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-O diazynium Chemical group [NH+]#N IJGRMHOSHXDMSA-UHFFFAOYSA-O 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- BOXSVZNGTQTENJ-UHFFFAOYSA-L zinc dibutyldithiocarbamate Chemical compound [Zn+2].CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC BOXSVZNGTQTENJ-UHFFFAOYSA-L 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- DUBNHZYBDBBJHD-UHFFFAOYSA-L ziram Chemical compound [Zn+2].CN(C)C([S-])=S.CN(C)C([S-])=S DUBNHZYBDBBJHD-UHFFFAOYSA-L 0.000 description 2
- KYWWFMUUMKLHES-UHFFFAOYSA-N 4-(phenyldisulfanyl)aniline Chemical compound C1=CC(N)=CC=C1SSC1=CC=CC=C1 KYWWFMUUMKLHES-UHFFFAOYSA-N 0.000 description 1
- CNDRYZMGSVVXNY-UHFFFAOYSA-N 5-diazo-2-(phenyldisulfanyl)cyclohexa-1,3-diene hydrochloride Chemical compound Cl.C1=CC(=[N+]=[N-])CC=C1SSC1=CC=CC=C1 CNDRYZMGSVVXNY-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 208000007542 Paresis Diseases 0.000 description 1
- 238000000944 Soxhlet extraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 150000002894 organic compounds Chemical group 0.000 description 1
- 208000012318 pareses Diseases 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/44—Carbon
- C09C1/48—Carbon black
- C09C1/56—Treatment of carbon black ; Purification
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Sealing Material Composition (AREA)
- Tires In General (AREA)
Abstract
A rubber composition prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group. The organic group has the formula -Ar-S n-Ar'- in which Ar and Ar' are arylene groups or -Ar-S n-Ar" in which Ar is an arylene group, Ar" is an aryl group and n is 1 to 8.
Description
EPDM, HNBR AND BUTYL RUBBER COMPOSITIONS
n CONTAINING CARBON BhACK PRODUCTS
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to the use of carbon black products in EPDM, HNBR, and butyl rubber compositions to provide increased modulus and increased bound rubber as well as other valuable properties.
Discussion of Related Art.
EPDM, HNBR, and butyl rubber are well known rubber compositons used in a wide variety of industrial and consumer products. See McGraw-Hill Encyclopedia of Science & Technology, pp. 761-763 (McGraw-Hill, 1982). EPDM is a copolymer of ethylene-propylene-diene monomers. HNBR is a partially hydrogenated copolymer made from the copolymerization of acrylonitrile and butadiene. Butyl rubber is a copolymer of isobutylene and isoprene.
EPDM, HNBR, and butyl rubber compositions are used in a wide variety of products. These products include, for example, automotive parts, gaskets, cable and wire coatings, mechanical rubber products, cover strips for the sidewalls of tires, innertubes for tires, safety bumpers, fabric coatings, electrical wire insulation, hoses, mechanical rubber goods, and sealants for ponds or reservoirs.
One characteristic of EPDM, HNBR, and butyl rubber is their low levels of unsaturation. The low level of unsaturation in EPDM, HNBR, and butyl rubber limits the effectiveness of reinforcing agents in rubber compositions made from these rubbers. This is particularly true when compared with the use of reinforcing agents in diene rubbers which have high degrees of unsaturation. Butyl rubber, for example, is generally a polybutylene with 0.5-4.5% of a diolefin, normally 3% isoprene. The small amount of diolefin in butyl rubber provides unsaturation for reinforcement and crosslinking.
Carbon blacks have been utilized as pigments, fillers, and/or reinforcing agents in the compounding and preparation of rubber compositions. The properties of the carbon black are important factors in determining various performance properties of the rubber composition containing the carbon black. See, for example, U.S. Pat. No.
5,236,992.
It would be desirable to develop a carbon black product which would impart desirable properties to EPDM, HNBR, and butyl rubber compositions containing the carbon black product.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides new rubber compositions prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group of the formula: -Ar-(S)n-Ar'- in which Ar and Ar' are arylene groups and n is 1 to 8, preferably 2 to 4.
In another embodiment, the invention provides a rubber composition prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group of the formula: -Ar-(S)n Ar" in which Ar is an arylene group, Ar" is an aryl group and n is 1 to 8, preferably 2 to 4.
The rubber compositions of the invention show increased modulus and increased bound rubber compared to that of the corresponding carbon blacks without the attached organic groups. Other features of the present invention will become apparent from the following detailed description of the invention and the claims.
DOCSM'rL: I 88028011 DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a rubber composition prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group. The organic groups have the general formula -Ar-(S)"-Ar'- in which Ar and Ar' are arylene groups or the general formula -Ar-(S)"-Ar" in which Ar is an arylene group and Ar" is an aryl group. In each of the general formulas the integer n varies from 1 to 8, preferably 2 to 4.
The carbon black product is prepared by reacting a carbon black with a diazonium salt corresponding to the organic group in a liquid reaction medium to attach at least one organic group to the surface of the carbon black. According to the invention, a diazonium salt is an organic compound having one or more diazonium groups. The diazonium salt can be conveniently prepared using means known in the art from a primary amine corresponding to the organic group, for example, Hz N-Ar-(S)" -Ar'-NHz or Hz N-Ar-(S)" -Ar". Preferred reaction media include water, any medium containing water, and any medium containing alcohol. These carbon black products and various methods for their preparation are described in U.S. 5851280 entitled "Reaction of Carbon Black with Diazonium Salts, Resultant Carbon Black Products and Their Uses".
Preparation of such carbon black products are also shown in the Examples below.
These carbon black products having organic groups of the formula: -Ar-(S)"-Ar'-or -Ar-(S)"-Ar" are particularly useful in EPDM, HNBR, and butyl rubber compositions.
In these organic groups Ar and Ar' are independently arylene groups, Ar" is an aryl and n is 1 to 8. Preferred arylene groups include phenylene groups, particularly p-phenylene groups. Preferred aryl groups include phenyl and naphthyl.
~ocsM~r~: isHOZSOn WO 96!18674 PCT/IB95/01154 The number of sulfurs present defined by n preferably r ranges from 2 to 4. A particularly preferred organic group is bis-pares- ( C6H4 ) -SZ- ( C6H4 ) - .
The above carbon black products may be mixed with EPDM, HNBR, or butyl rubbers by normal means known in the art, for example by milling. The rubber compositions containing the carbon black products can be cured using conventional sulfur-based or peroxide systems. Other conventionally used additives may be added to the rubber compositions of this invention.
Generally, amounts of~the carbon black product ranging from about 10 to about 300 parts by weight can be used for each 100 parts by weight of the rubber in order to impart a significant degree of reinforcement. It is, however, preferred to use amounts varying from about 50 to about 200 parts by weight of carbon black product per 100 parts by weight of the rubber and especially preferred is the utilization of from about 70 to about 150 parts of carbon black product per 100 parts of the rubber.
The presence of the carbon black products discussed above improves the physical characteristics of the rubber compositions of the invention as compared with the corresponding untreated carbon blacks. Incorporating the carbon black products into the rubber compositions increases the modulus and bound rubber properties of the rubber compositions.
The following examples are intended to illustrate, not limit, this invention.
ASTM test procedures were used to evaluate the rubber compositions of the invention shown in the Examples below. , Iodine number was measured using ASTM D-1510. DBPA was measured using ASTM D-2414. Tensile elongation and modulus were measured using ASTM D-412. Shore A hardness was measured using ASTM D-2240-86. Viscosity was measured using a MPT viscometer at 100oC and 100s-1 with Z/D = 16/1 in the capillary.
n CONTAINING CARBON BhACK PRODUCTS
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to the use of carbon black products in EPDM, HNBR, and butyl rubber compositions to provide increased modulus and increased bound rubber as well as other valuable properties.
Discussion of Related Art.
EPDM, HNBR, and butyl rubber are well known rubber compositons used in a wide variety of industrial and consumer products. See McGraw-Hill Encyclopedia of Science & Technology, pp. 761-763 (McGraw-Hill, 1982). EPDM is a copolymer of ethylene-propylene-diene monomers. HNBR is a partially hydrogenated copolymer made from the copolymerization of acrylonitrile and butadiene. Butyl rubber is a copolymer of isobutylene and isoprene.
EPDM, HNBR, and butyl rubber compositions are used in a wide variety of products. These products include, for example, automotive parts, gaskets, cable and wire coatings, mechanical rubber products, cover strips for the sidewalls of tires, innertubes for tires, safety bumpers, fabric coatings, electrical wire insulation, hoses, mechanical rubber goods, and sealants for ponds or reservoirs.
One characteristic of EPDM, HNBR, and butyl rubber is their low levels of unsaturation. The low level of unsaturation in EPDM, HNBR, and butyl rubber limits the effectiveness of reinforcing agents in rubber compositions made from these rubbers. This is particularly true when compared with the use of reinforcing agents in diene rubbers which have high degrees of unsaturation. Butyl rubber, for example, is generally a polybutylene with 0.5-4.5% of a diolefin, normally 3% isoprene. The small amount of diolefin in butyl rubber provides unsaturation for reinforcement and crosslinking.
Carbon blacks have been utilized as pigments, fillers, and/or reinforcing agents in the compounding and preparation of rubber compositions. The properties of the carbon black are important factors in determining various performance properties of the rubber composition containing the carbon black. See, for example, U.S. Pat. No.
5,236,992.
It would be desirable to develop a carbon black product which would impart desirable properties to EPDM, HNBR, and butyl rubber compositions containing the carbon black product.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides new rubber compositions prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group of the formula: -Ar-(S)n-Ar'- in which Ar and Ar' are arylene groups and n is 1 to 8, preferably 2 to 4.
In another embodiment, the invention provides a rubber composition prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group of the formula: -Ar-(S)n Ar" in which Ar is an arylene group, Ar" is an aryl group and n is 1 to 8, preferably 2 to 4.
The rubber compositions of the invention show increased modulus and increased bound rubber compared to that of the corresponding carbon blacks without the attached organic groups. Other features of the present invention will become apparent from the following detailed description of the invention and the claims.
DOCSM'rL: I 88028011 DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a rubber composition prepared by the process comprising mixing 100 parts by weight of a rubber selected from EPDM, HNBR, and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group. The organic groups have the general formula -Ar-(S)"-Ar'- in which Ar and Ar' are arylene groups or the general formula -Ar-(S)"-Ar" in which Ar is an arylene group and Ar" is an aryl group. In each of the general formulas the integer n varies from 1 to 8, preferably 2 to 4.
The carbon black product is prepared by reacting a carbon black with a diazonium salt corresponding to the organic group in a liquid reaction medium to attach at least one organic group to the surface of the carbon black. According to the invention, a diazonium salt is an organic compound having one or more diazonium groups. The diazonium salt can be conveniently prepared using means known in the art from a primary amine corresponding to the organic group, for example, Hz N-Ar-(S)" -Ar'-NHz or Hz N-Ar-(S)" -Ar". Preferred reaction media include water, any medium containing water, and any medium containing alcohol. These carbon black products and various methods for their preparation are described in U.S. 5851280 entitled "Reaction of Carbon Black with Diazonium Salts, Resultant Carbon Black Products and Their Uses".
Preparation of such carbon black products are also shown in the Examples below.
These carbon black products having organic groups of the formula: -Ar-(S)"-Ar'-or -Ar-(S)"-Ar" are particularly useful in EPDM, HNBR, and butyl rubber compositions.
In these organic groups Ar and Ar' are independently arylene groups, Ar" is an aryl and n is 1 to 8. Preferred arylene groups include phenylene groups, particularly p-phenylene groups. Preferred aryl groups include phenyl and naphthyl.
~ocsM~r~: isHOZSOn WO 96!18674 PCT/IB95/01154 The number of sulfurs present defined by n preferably r ranges from 2 to 4. A particularly preferred organic group is bis-pares- ( C6H4 ) -SZ- ( C6H4 ) - .
The above carbon black products may be mixed with EPDM, HNBR, or butyl rubbers by normal means known in the art, for example by milling. The rubber compositions containing the carbon black products can be cured using conventional sulfur-based or peroxide systems. Other conventionally used additives may be added to the rubber compositions of this invention.
Generally, amounts of~the carbon black product ranging from about 10 to about 300 parts by weight can be used for each 100 parts by weight of the rubber in order to impart a significant degree of reinforcement. It is, however, preferred to use amounts varying from about 50 to about 200 parts by weight of carbon black product per 100 parts by weight of the rubber and especially preferred is the utilization of from about 70 to about 150 parts of carbon black product per 100 parts of the rubber.
The presence of the carbon black products discussed above improves the physical characteristics of the rubber compositions of the invention as compared with the corresponding untreated carbon blacks. Incorporating the carbon black products into the rubber compositions increases the modulus and bound rubber properties of the rubber compositions.
The following examples are intended to illustrate, not limit, this invention.
ASTM test procedures were used to evaluate the rubber compositions of the invention shown in the Examples below. , Iodine number was measured using ASTM D-1510. DBPA was measured using ASTM D-2414. Tensile elongation and modulus were measured using ASTM D-412. Shore A hardness was measured using ASTM D-2240-86. Viscosity was measured using a MPT viscometer at 100oC and 100s-1 with Z/D = 16/1 in the capillary.
Tan b was measured with a Rheometrics Dynamic Spectrometer Model RDS-2 at a constant frequency of 10 Hz, ~at room temperature, and in the shear mode of strain.
Strain sweeps were run from 0.088 to 10~ DSA. Measurements were taken at five points per decade and the maximum Tan b was reported.
Bound rubber was determined as follows: A 0.5 g sample of an uncured rubber composition containing a rubber and a known amount of a carbon black was placed in a wire cage and submerged in a solvent. After standing for one day, the sample was placed in fresh solvent, and allowed to stand for three additional days at room temperature. The sample was then removed, dried in an oven, and weighed.
The weight of the carbon black was subtracted from weight of the sample before and after the solvent treatment to give a value for the amount of rubber in each sample. The weight of the sample after the solvent treatment, adjusted for the weight of the carbon black and other insoluble ingredients in the composition, represents the amount of insoluble rubber remaining. Bound rubber was expressed as the percentage of the weight of insoluble rubber in the sample after standing in the solvent versus the amount of rubber in the original sample.
Example 1 Preparation of a carbon black product This example describes the preparation of a carbon black product for use in the present invention.
Concentrated HC1 (2.62g) was diluted with 30 g and added to a stirring mixture of 1.5 g p-aminophenyl disulfide in 100 g of water. The resulting solution was cooled in an ice bath and a cold solution of 0.95 g NaN02 in 40 g of water was added with stirring. 4-Diazophenyl disulfide is formed. The solution was added to a suspension of 150 g of pelleted carbon black (iodine number of 19 mg~g and a DBPA
of 95 ml/100g) in 1200 mZ of water at about 14°C with stirring. Bubbles were released. After stirring for 2 1/4 hours, the product was filtered, washed with 800 mL of ethanol, washed with 2L of water, and dried at 125oC. This process produced a carbon black product having dithiodi(4,1-phenylene) groups attached to the carbon black.
Example 2 Reference carboy black A reference carbon black was prepared by washing 158 g of the unreacted carbon black of Example 1 with 800 mL of ethanol, about 2 L of water, and subsequently drying in an oven at 125oC.
Example 3 Preparation of a carbon black product This example describes the preparation of a carbon black product for use in the present invention.
Concentrated HC1 (5.70 g) was diluted with 30 g of water and added to a stirring mixture of 3.50 g p-aminophenyl disulfide in 100 g of water. The resulting solution was cooled in an ice bath and a cold solution of 2.11 g NaN02 in 50 g of water was added with stirring. 4-Diazophenyl disulfide is formed. The solution was added to a suspension of 250 g of pelleted carbon black (iodine number of 36 mg/g and a DBPA of 122 ml/100g) in 1500 mL of water at about 14°C with stirring. Bubbles were released. After stirring for 2 hours, the product was filtered, washed with 1.1 L of ethanol, washed with 3 L of water, and dried at 125°C. A sample of the carbon black product that was extracted overnight with tetrahydrofuran (THF) and dried contained 1.32 sulfur, compared to 0.99 for the unreacted ~.
carbon black. Therefore, the product contained 0.05 mmol/g of dithiodi(4,1-phenylene) groups.
_ 7 _ Example 4 Reference carbon black A reference carbon black was prepared by washing 250 g of the unreacted carbon black of Example 3 with 1.1 L of ethanol, about 3 L of water, and subsequently drying in an oven at 125oC.
Example 5 Use of a carbon black product 9.n EPDM
This example illustrates the use of the carbon black product of Example 1, the washed carbon black reference of Example 2 and the unwashed carbon black reference from Example 1 in EPDM. VISTALON 5600 EPDM (81.4 g) (VISTALON
is a registered trademark of Exxon Chemical Americas, Houston, TX) was milled in a Brabender mixer for one minute at an initial temperature of 45oC at 77 rpm. A paraffinic oil ASTM D-2226, type 104B, (122.1 g) was added and mixed for one minute. The carbon black (122.1 g) was added and mixed for 2 1/2 minutes. Zinc oxide (4.07 g) and 0.81 g of stearic acid were added and mixed for two minutes.
Tetramethyl thiuram disulfide (2.2 g), 2.2 g of zinc dibutyldithiocarbamate, 2.2 g of zinc dimethyldithiocarbamate, 0.41 g of sulfur and 1.38 g of 4,4'dithiodimorpholine were added and mixed for an additional two minutes. Bound rubber was determined using toluene as the solvent at room temperature. The table below shows that the carbon black product of Example 1 is useful in EPDM and increases modulus and bound rubber.
3 ~ Sample TensileElongationModulusModulusHardnessViscosityBound MPa ~ 100 3008 Sh A Pa-s Rubber ~
MPa MPa g Ex. 1 10.9 553 1.62 5.96 47 2120 8.8 Ref. 12.4 731 1.26 3.75 46 2130 5.8 Ex. 2 Ref. 11.9 679 1.38 4.16 46 2080 7.1 , Unwashed Example 6 Use of a carbon black product in EPDM
This example illustrates the use of the carbon black product of Example 3, the washed carbon black reference of Example 4 and the unwashed carbon black reference from Example 3 in EPDM. VISTAZON 5600 EPDM (81.4 g) was milled in a Brabender mixer for one minute at an initial temperature of 60oC at 50 rpm. A paraffinic oil ASTM D-2226, type 104B, .(122.1 g) was added and mixed for one minute. The carbon black (122.1 g) was added and mixed for 2 1/2 minutes. Zinc oxide (4.07 g) and 0.81 g of stearic acid were added and mixed for two minutes. Tetramethyl thiuram disulfide (2.2 g), 2.2 g of zinc dibutyldithiocarbamate, 2.2 g of zinc dimethyldithiocarbamate, 0.41 g of sulfur and 1.38 g of 4,4'dithiodimorpholine were added and mixed for an additional two minutes. Bound rubber was determined using toluene as solvent at room temperature. The table below shows that the carbon black product of Example 3 is useful in EPDM and increases modulus and bound rubber.
r 2 5 Sample TensileElongationModulusModulusHardnessViscosityBound MPa 8 100 300 Sh A Pa-s Rubber 'k MPa MPa 'k Ex. 3 10.0 364 2.93 8.61 63 2260 44.8 Ref. 10.6 467 2.63 7.14 62 2230 39.6 Ex. 4 f Ref. 9.8 941 2.63 7.13 62 2150 39.8 3 ~ Unwashed c Example 7 Use of a carbon black product in butyl rubber 35 This example illustrates the use of the carbon black g product of Example 3, the washed carbon black reference of Example 4 and the unwashed carbon black reference from Example 3 in butyl rubber. Butyl rubber 301 (181.1g) was milled in a Brabender mixer at 40 rpm for 30 seconds at an initial temperature of 30oC. A paraffinic oil ASTM D-2226, type 104B, (21.7 g) and the carbon black (135.9 g) were added and mixed for two minutes. Zn0 (9.1 g) and sulfur (2.7 g) were added and milling was continued for 3 1/2 minutes. Tetramethyl thiuram disulfide (3.6 g) and mercaptobenzothiazole (1.8 g) were added and mixed for an additional 1 1/2 minutes. Bound rubber was determined using cyclohexane as solvent at room temperature. The table below shows that the carbon black product of Example 3 is useful in butyl rubber, increases modulus and bound rubber, and decreases hysteresis as shown by higher rebound and lower Tan 8.
Sample TensileElonga-Modu-Modu- Hard- ReboundTan Visco-Bound MPa tion lus lus ness 9 $ sity Rubber 1009 3008 Sh Pa-s A
MPa MPa Ex. 11.7 470 3.49 9.43 74 13.2 0.29 5020 7.54 2 0 Ref. 10.6 528 2.97 7.58 70 12.2 0.35 4880 3.54 Ex.
Ref. 10.2 520 2.94 7.51 71 12.1 0.37 4850 4.42 Unwash-ed Example 8 Preparation of a carbon black product This example illustrates the preparation of a carbon black product useful in the rubber compositions of the present invention. A carbon black with an iodine number of 120 mg/g and a DBPA of 125 m1/100 g was used. A cold solution of 2.65 g concentrated HC1 and 30 g water was added to a mixture of 2.85 g 4-aminophenyl phenyl disulfide in 50 g water that was stirring in an ice bath. A cold solution of 1.04 g NaN02 in 30 g of water was added over a period of l0 minutes. 4-Diazophenyl phenyl disulfide chloride was formed. The diazonium suspension was added to a suspension of 122 g carbon black in about 800 g water that was stirring at 15°C. Bubbles were released. After stirring for about two hours, the carbon black product was filtered off, washed with isopropanol, washed with water, and dried in an oven at about 125°C. A sample of the carbon black product that had been subjected to Soxhlet extraction overnight with THF and dried had a sulfur content of 1.32, compared to 1.08 for the untreated carbon black.
Therefore, the carbon black product had 0.038 mmol/g of attached phenyldithiophenylene groups. This carbon black product may be incorporated into a rubber composition of the invention in accordance the examples above.
Example 9 Use of a carbon black product in HNBR
Following generally the procedures of Examples 5-7, a carbon black product such as shown in Examples 1-4 and 8 may be incorporated into HNBR to form a rubber composition of the invention.
Strain sweeps were run from 0.088 to 10~ DSA. Measurements were taken at five points per decade and the maximum Tan b was reported.
Bound rubber was determined as follows: A 0.5 g sample of an uncured rubber composition containing a rubber and a known amount of a carbon black was placed in a wire cage and submerged in a solvent. After standing for one day, the sample was placed in fresh solvent, and allowed to stand for three additional days at room temperature. The sample was then removed, dried in an oven, and weighed.
The weight of the carbon black was subtracted from weight of the sample before and after the solvent treatment to give a value for the amount of rubber in each sample. The weight of the sample after the solvent treatment, adjusted for the weight of the carbon black and other insoluble ingredients in the composition, represents the amount of insoluble rubber remaining. Bound rubber was expressed as the percentage of the weight of insoluble rubber in the sample after standing in the solvent versus the amount of rubber in the original sample.
Example 1 Preparation of a carbon black product This example describes the preparation of a carbon black product for use in the present invention.
Concentrated HC1 (2.62g) was diluted with 30 g and added to a stirring mixture of 1.5 g p-aminophenyl disulfide in 100 g of water. The resulting solution was cooled in an ice bath and a cold solution of 0.95 g NaN02 in 40 g of water was added with stirring. 4-Diazophenyl disulfide is formed. The solution was added to a suspension of 150 g of pelleted carbon black (iodine number of 19 mg~g and a DBPA
of 95 ml/100g) in 1200 mZ of water at about 14°C with stirring. Bubbles were released. After stirring for 2 1/4 hours, the product was filtered, washed with 800 mL of ethanol, washed with 2L of water, and dried at 125oC. This process produced a carbon black product having dithiodi(4,1-phenylene) groups attached to the carbon black.
Example 2 Reference carboy black A reference carbon black was prepared by washing 158 g of the unreacted carbon black of Example 1 with 800 mL of ethanol, about 2 L of water, and subsequently drying in an oven at 125oC.
Example 3 Preparation of a carbon black product This example describes the preparation of a carbon black product for use in the present invention.
Concentrated HC1 (5.70 g) was diluted with 30 g of water and added to a stirring mixture of 3.50 g p-aminophenyl disulfide in 100 g of water. The resulting solution was cooled in an ice bath and a cold solution of 2.11 g NaN02 in 50 g of water was added with stirring. 4-Diazophenyl disulfide is formed. The solution was added to a suspension of 250 g of pelleted carbon black (iodine number of 36 mg/g and a DBPA of 122 ml/100g) in 1500 mL of water at about 14°C with stirring. Bubbles were released. After stirring for 2 hours, the product was filtered, washed with 1.1 L of ethanol, washed with 3 L of water, and dried at 125°C. A sample of the carbon black product that was extracted overnight with tetrahydrofuran (THF) and dried contained 1.32 sulfur, compared to 0.99 for the unreacted ~.
carbon black. Therefore, the product contained 0.05 mmol/g of dithiodi(4,1-phenylene) groups.
_ 7 _ Example 4 Reference carbon black A reference carbon black was prepared by washing 250 g of the unreacted carbon black of Example 3 with 1.1 L of ethanol, about 3 L of water, and subsequently drying in an oven at 125oC.
Example 5 Use of a carbon black product 9.n EPDM
This example illustrates the use of the carbon black product of Example 1, the washed carbon black reference of Example 2 and the unwashed carbon black reference from Example 1 in EPDM. VISTALON 5600 EPDM (81.4 g) (VISTALON
is a registered trademark of Exxon Chemical Americas, Houston, TX) was milled in a Brabender mixer for one minute at an initial temperature of 45oC at 77 rpm. A paraffinic oil ASTM D-2226, type 104B, (122.1 g) was added and mixed for one minute. The carbon black (122.1 g) was added and mixed for 2 1/2 minutes. Zinc oxide (4.07 g) and 0.81 g of stearic acid were added and mixed for two minutes.
Tetramethyl thiuram disulfide (2.2 g), 2.2 g of zinc dibutyldithiocarbamate, 2.2 g of zinc dimethyldithiocarbamate, 0.41 g of sulfur and 1.38 g of 4,4'dithiodimorpholine were added and mixed for an additional two minutes. Bound rubber was determined using toluene as the solvent at room temperature. The table below shows that the carbon black product of Example 1 is useful in EPDM and increases modulus and bound rubber.
3 ~ Sample TensileElongationModulusModulusHardnessViscosityBound MPa ~ 100 3008 Sh A Pa-s Rubber ~
MPa MPa g Ex. 1 10.9 553 1.62 5.96 47 2120 8.8 Ref. 12.4 731 1.26 3.75 46 2130 5.8 Ex. 2 Ref. 11.9 679 1.38 4.16 46 2080 7.1 , Unwashed Example 6 Use of a carbon black product in EPDM
This example illustrates the use of the carbon black product of Example 3, the washed carbon black reference of Example 4 and the unwashed carbon black reference from Example 3 in EPDM. VISTAZON 5600 EPDM (81.4 g) was milled in a Brabender mixer for one minute at an initial temperature of 60oC at 50 rpm. A paraffinic oil ASTM D-2226, type 104B, .(122.1 g) was added and mixed for one minute. The carbon black (122.1 g) was added and mixed for 2 1/2 minutes. Zinc oxide (4.07 g) and 0.81 g of stearic acid were added and mixed for two minutes. Tetramethyl thiuram disulfide (2.2 g), 2.2 g of zinc dibutyldithiocarbamate, 2.2 g of zinc dimethyldithiocarbamate, 0.41 g of sulfur and 1.38 g of 4,4'dithiodimorpholine were added and mixed for an additional two minutes. Bound rubber was determined using toluene as solvent at room temperature. The table below shows that the carbon black product of Example 3 is useful in EPDM and increases modulus and bound rubber.
r 2 5 Sample TensileElongationModulusModulusHardnessViscosityBound MPa 8 100 300 Sh A Pa-s Rubber 'k MPa MPa 'k Ex. 3 10.0 364 2.93 8.61 63 2260 44.8 Ref. 10.6 467 2.63 7.14 62 2230 39.6 Ex. 4 f Ref. 9.8 941 2.63 7.13 62 2150 39.8 3 ~ Unwashed c Example 7 Use of a carbon black product in butyl rubber 35 This example illustrates the use of the carbon black g product of Example 3, the washed carbon black reference of Example 4 and the unwashed carbon black reference from Example 3 in butyl rubber. Butyl rubber 301 (181.1g) was milled in a Brabender mixer at 40 rpm for 30 seconds at an initial temperature of 30oC. A paraffinic oil ASTM D-2226, type 104B, (21.7 g) and the carbon black (135.9 g) were added and mixed for two minutes. Zn0 (9.1 g) and sulfur (2.7 g) were added and milling was continued for 3 1/2 minutes. Tetramethyl thiuram disulfide (3.6 g) and mercaptobenzothiazole (1.8 g) were added and mixed for an additional 1 1/2 minutes. Bound rubber was determined using cyclohexane as solvent at room temperature. The table below shows that the carbon black product of Example 3 is useful in butyl rubber, increases modulus and bound rubber, and decreases hysteresis as shown by higher rebound and lower Tan 8.
Sample TensileElonga-Modu-Modu- Hard- ReboundTan Visco-Bound MPa tion lus lus ness 9 $ sity Rubber 1009 3008 Sh Pa-s A
MPa MPa Ex. 11.7 470 3.49 9.43 74 13.2 0.29 5020 7.54 2 0 Ref. 10.6 528 2.97 7.58 70 12.2 0.35 4880 3.54 Ex.
Ref. 10.2 520 2.94 7.51 71 12.1 0.37 4850 4.42 Unwash-ed Example 8 Preparation of a carbon black product This example illustrates the preparation of a carbon black product useful in the rubber compositions of the present invention. A carbon black with an iodine number of 120 mg/g and a DBPA of 125 m1/100 g was used. A cold solution of 2.65 g concentrated HC1 and 30 g water was added to a mixture of 2.85 g 4-aminophenyl phenyl disulfide in 50 g water that was stirring in an ice bath. A cold solution of 1.04 g NaN02 in 30 g of water was added over a period of l0 minutes. 4-Diazophenyl phenyl disulfide chloride was formed. The diazonium suspension was added to a suspension of 122 g carbon black in about 800 g water that was stirring at 15°C. Bubbles were released. After stirring for about two hours, the carbon black product was filtered off, washed with isopropanol, washed with water, and dried in an oven at about 125°C. A sample of the carbon black product that had been subjected to Soxhlet extraction overnight with THF and dried had a sulfur content of 1.32, compared to 1.08 for the untreated carbon black.
Therefore, the carbon black product had 0.038 mmol/g of attached phenyldithiophenylene groups. This carbon black product may be incorporated into a rubber composition of the invention in accordance the examples above.
Example 9 Use of a carbon black product in HNBR
Following generally the procedures of Examples 5-7, a carbon black product such as shown in Examples 1-4 and 8 may be incorporated into HNBR to form a rubber composition of the invention.
Claims (12)
1. A rubber composition prepared by a process comprising mixing 100 parts by weight of rubber selected from EPDM, HNBR and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group of the formula:
-Ar-Sn-Ar'-in which Ar and Ar' are arylene groups and n is 1 to 8.
-Ar-Sn-Ar'-in which Ar and Ar' are arylene groups and n is 1 to 8.
2. A rubber composition of claim 1, wherein n is 2 to 4.
3. A rubber composition of claim 1 or 2, wherein the process further comprises curing the mixture of the rubber and the carbon black product.
4. A rubber composition of claim 1, 2 or 3, wherein Ar and Ar' are p-phenylene.
5. A rubber composition of claim 4, wherein n is 2.
6. A rubber composition of claim 1, 2, 3, 4 or 5, wherein the rubber is EPDM.
7. A rubber composition prepared by a process comprising mixing 100 parts by weight of rubber selected from EPDM, HNBR and butyl rubber, and 10 to 300 parts by weight of a carbon black product having an attached organic group of the formula:
-Ar-Sn-Ar"
in which Ar is an arylene group, Ar" is an aryl group and n is 1 to 8.
-Ar-Sn-Ar"
in which Ar is an arylene group, Ar" is an aryl group and n is 1 to 8.
8. A rubber composition of claim 7 wherein n is 2 to 4.
9. A rubber composition of claim 7 or 8, wherein the process further comprises curing the mixture of the rubber and the carbon black product.
10. A rubber composition of claim 7, 8 or 9, wherein Ar is phenylene and Ar"
is phenyl.
is phenyl.
11. A rubber composition of claim 10, wherein n is 2.
12. A rubber composition of claim 7, 8, 9, 10 or 11, wherein the rubber is EPDM.
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US08/356,459 US5559169A (en) | 1994-12-15 | 1994-12-15 | EPDM, HNBR and Butyl rubber compositions containing carbon black products |
US08/356,459 | 1994-12-15 | ||
PCT/IB1995/001154 WO1996018674A1 (en) | 1994-12-15 | 1995-12-14 | Epdm, hnbr and butyl rubber compositions containing carbon black products |
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CA2207544A1 CA2207544A1 (en) | 1996-06-20 |
CA2207544C true CA2207544C (en) | 2006-10-24 |
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EP (1) | EP0797619B1 (en) |
JP (1) | JP3672926B2 (en) |
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-
1994
- 1994-12-15 US US08/356,459 patent/US5559169A/en not_active Expired - Lifetime
-
1995
- 1995-12-14 EP EP95942262A patent/EP0797619B1/en not_active Expired - Lifetime
- 1995-12-14 DE DE69530997T patent/DE69530997T2/en not_active Expired - Fee Related
- 1995-12-14 AU AU43533/96A patent/AU693983B2/en not_active Ceased
- 1995-12-14 KR KR1019970704010A patent/KR100379729B1/en not_active IP Right Cessation
- 1995-12-14 JP JP51854896A patent/JP3672926B2/en not_active Expired - Lifetime
- 1995-12-14 IN IN1649MA1995 patent/IN192665B/en unknown
- 1995-12-14 TW TW084113322A patent/TW336244B/en not_active IP Right Cessation
- 1995-12-14 MY MYPI95003865A patent/MY113103A/en unknown
- 1995-12-14 AT AT95942262T patent/ATE242294T1/en not_active IP Right Cessation
- 1995-12-14 AR AR33462495A patent/AR000351A1/en unknown
- 1995-12-14 CA CA002207544A patent/CA2207544C/en not_active Expired - Fee Related
- 1995-12-14 ZA ZA9510663A patent/ZA9510663B/en unknown
- 1995-12-14 WO PCT/IB1995/001154 patent/WO1996018674A1/en active IP Right Grant
- 1995-12-14 RU RU97111805/04A patent/RU2187522C2/en not_active IP Right Cessation
-
1998
- 1998-04-01 HK HK98102768A patent/HK1003643A1/en not_active IP Right Cessation
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US5559169A (en) | 1996-09-24 |
DE69530997T2 (en) | 2004-05-19 |
HK1003643A1 (en) | 1998-11-06 |
WO1996018674A1 (en) | 1996-06-20 |
MX9704380A (en) | 1997-10-31 |
JPH10510574A (en) | 1998-10-13 |
ZA9510663B (en) | 1996-07-16 |
IN192665B (en) | 2004-05-15 |
TW336244B (en) | 1998-07-11 |
CA2207544A1 (en) | 1996-06-20 |
EP0797619B1 (en) | 2003-06-04 |
DE69530997D1 (en) | 2003-07-10 |
RU2187522C2 (en) | 2002-08-20 |
ATE242294T1 (en) | 2003-06-15 |
KR100379729B1 (en) | 2004-04-28 |
AR000351A1 (en) | 1997-06-18 |
AU693983B2 (en) | 1998-07-09 |
AU4353396A (en) | 1996-07-03 |
MY113103A (en) | 2001-11-30 |
JP3672926B2 (en) | 2005-07-20 |
EP0797619A1 (en) | 1997-10-01 |
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