# US 5,346,760 A · Composite material based on rubbers of the silicone type and of the ethylene-propylene copolymer or terpolymer type > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,760 A - Document ID: US5346760A - Status: Granted - Kind: A - Application number: 07/824,326 - Filed: 1992-01-23 - Granted: 1994-09-13 - Earliest claimed: 1992-01-23 - Assignees: Total Ruffinage Distribution S.A. - Inventors: Guy Lemoine; Etienne Benard; Christian Exandier - Web page: https://patentgrep.com/patent/US5346760A ## CPC - B32B 25/042: {of natural rubber or synthetic rubber} - B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)} - B32B 25/20: comprising silicone rubber - C08K 3/04: Carbon - C08K 3/22: of metals - C08K 3/36: Silica - C08K 5/14: Peroxides - C08K 5/54: Silicon-containing compounds {(C08K5/0091 takes precedence)} - C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers - C08L 83/00: Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers - C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof - B29C 66/7212: {characterised by the composition of the fibres} - C08L 2312/00: Crosslinking - Y10T 428/256: Heavy metal or aluminum or compound thereof - Y10T 428/257: Iron oxide or aluminum oxide - Y10T 428/258: Alkali metal or alkaline earth metal or compound thereof - Y10T 428/259: Silicic material - Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension - Y10T 428/263: Coating layer not in excess of 5 mils thick or equivalent - Y10T 428/31663: As siloxane, silicone or silane - Y10T 428/31667: Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product - Y10T 428/31913: Monoolefin polymer - Y10T 428/31917: Next to polyene polymer - Y10T 428/31924: Including polyene monomers - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A composite material comprising at least two elastomer layers, the first layer having a first composition comprising from 40 to 80 percent by weight of silicone rubber, the second layer having a second composition comprising from 50 to 100 percent by weight of rubber of the ethylene-propylene copolymer and/or terpolymer type, wherein the first composition further contains from 20 to 60 percent by weight of rubber of the ethylene-propylene copolymer and/or terpolymer type, and each of the two compositions contains more than 5 percent, and preferably from 5 to 60 percent, by weight of silica. ## Claims ### Claim 1 A composite material comprising at least two different elastomer layers, the first layer having a first composition of from 40 to 80 percent by weight of silicone rubber and from 20 to 60 percent by weight of ethylene-propylene copolymer and/or terpolymer rubber, the second layer having a second composition whose rubber content consists essentially of from 50 to 100 percent by weight of ethylene-propylene copolymer and/or terpolymer, and from 0 to 50 percent by weight of a rubber selected from the group consisting of nitrile rubbers, styrene-butadiene rubbers, natural rubbers, fluoroelastomers, chlorosulfonated or chlorinated polyethylenes, acrylic rubbers, epichlorohydrin rubbers, thermoplastic elastomers and nonvulcanizable thermoplastics, the first composition contains more than 10 percent by weight of silica and the second composition contains more than 10 percent by weight of silica in said compositions, and the silica has a pore volume ranging from 150 to 250 m.sup.3 /gram and an average primary particle size of less than 12 nanometers. ### Claim 2 (depends on 1) The composite material as defined in claim 1, wherein each of the two compositions contains from 10 to 60% by weight of silica. ### Claim 3 (depends on 1) The composite material as defined in claim 1, wherein the silica used in the two elastomer compositions is pyrogenic or precipitated silica. ### Claim 4 (depends on 1) The composite material as defined in claim 1, wherein the first silicone-based layer contains less than 10 percent by weight of the rubber, of hydrogenated oil. ### Claim 5 (depends on 3) The composite material as defined in claim 3, wherein the first silicone-based layer contains less than 10 percent by weight of the rubber, of unhydrogenated oil. ### Claim 6 (depends on 4) The composite material as defined in claim 4, wherein the first silicone-based layer contains less than 1 percent by weight of the rubber, of hydrogenated oil. ### Claim 7 (depends on 5) The composite material as defined in claim 5, wherein the first silicone-based layer contains less than 1 percent by weight of the rubber, of unhydrogenated oil. ### Claim 8 (depends on 1) The composite material as defined in claim 1, wherein the silicone rubber of the first layer is a diorganopolysiloxane. ### Claim 9 (depends on 5) The composite material as defined in claim 5, wherein the silicone rubber of the first layer is a diorganopolysiloxane. ### Claim 10 (depends on 1) The composite material as defined in claim 1, wherein the ethylene-propylene copolymer and/or terpolymer rubber contained in the first and second layers is an ethylene-propylene copolymer comprising (1) about 40 to 80 percent by weight of ethylene and 60 to 20 percent by weight of propylene, (2) from 40 to 80 percent by weight of ethylene, from 60 to 20 percent by weight of propylene, and from 1 to 10 percent by weight of a conjugated monomeric diene or (3) a mixture of the two copolymers (1) and (2). ### Claim 11 (depends on 9) The composite material as defined in claim 9, wherein the ethylene-propylene copolymer and/or terpolymer rubber contained in the first and second layers is an ethylene-propylene copolymer comprising (1) about 40 to 80 percent by weight of ethylene and 60 to 20 percent by weight of propylene, (2) from 40 to 80 percent by weight of ethylene, from 60 to 20 percent by weight of propylene, and from 1 to 10 percent by weight of a conjugated monomeric diene or(3) a mixture of the two copolymers(1) and (2). ### Claim 12 (depends on 1) The composite material as defined in claim 1, wherein the elastomer layer based on silicone contains peroxide as a vulcanizing agent. ### Claim 13 (depends on 1) The composite material as defined in claim 1, wherein the layer based on silicone rubber contains from 5 to 80 parts by weight of colorants selected from the group consisting zinc oxide, iron oxide, titanium oxide, cobalt oxide, magnesium oxide, aluminum oxide, organic pigment and any other inorganic pigment, per 100 parts by weight of said first composition. ### Claim 14 (depends on 11) The composite material as defined in claim 11, wherein the layer based on silicone rubber contains from 5 to 80 parts by weight of colorants selected from the group consisting zinc oxide, iron oxide, titanium oxide, cobalt oxide, magnesium oxide, aluminum oxide, organic pigment and any other inorganic pigment, per 100 parts by weight of said first composition. ### Claim 15 (depends on 1) The composite material as defined in claim 1, wherein the first layer based on silicone is used as a face layer of the composite material in a thickness of less than 1 mm. ### Claim 16 (depends on 14) The composite material as defined in claim 14, wherein the first layer based on silicone is used as a face layer of the composite material in a thickness of between 0.1 and 0.5 mm.