# US 5,708,076 A · Room temerature-curable organopolysiloxane composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,076 A - Document ID: US5708076A - Status: Granted - Kind: A - Application number: 08/789,450 - Filed: 1997-01-27 - Granted: 1998-01-13 - Earliest claimed: 1997-01-27 - Assignees: Dow Corning Toray Silicone Co., Ltd. - Inventors: Yuichi Tsuji; Miyoji Fukayama - Web page: https://patentgrep.com/patent/US5708076A ## CPC - C08L 83/04: Polysiloxanes - C08K 3/01: characterized by their specific function - C08G 77/16: to hydroxy groups - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract A room temperature-curable organopolysiloxane composition with excellent extrudability and self-extinguishing properties is made from a hydroxyl endblocked polydiorganosiloxane, aluminum hydroxide having an average particle size not exceeding 50 micrometers, colloidal calcium carbonate, platinum or a platinum compound, and a crosslinking silane or siloxane having at least three hydrolyzable groups. ## Claims ### Claim 1 A room temperature-curable organopolysiloxane composition comprising (A) 100 parts by weight of hydroxyl group-terminated polydiorganosiloxane having a viscosity at 25.degree. C. of 100 to 500,000 centipoise, (B) 50 to 100 parts by weight of aluminum hydroxide microparticles having an average particle diameter not exceeding 50 micrometers, (C) 50 to 100 parts by weight of colloidal calcium carbonate, (D) platinum or a platinum compound, in a quantity sufficient to provide 1 to 200 parts by weight platinum metal per 1,000,000 parts by weight of component (A), and (E) 0.5 to 20 parts by weight of a silicon compound which contains at least 3 Si-bonded hydrolyzable groups in each molecule, where the silicon compound is a silane, siloxane, or mixture of silane and siloxane. ### Claim 2 (depends on 1) The room temperature-curable organopolysiloxane composition according to claim 1 in which the hydrolyzable groups are selected from the group consisting of alkoxy, haloalkoxy, alkoxyalkoxy, alkenyloxy, ketoximo, amino, acetamido, and aminoxy. ### Claim 3 (depends on 1) The room temperature-curable organopolysiloxane composition according to claim 1 in which the average particle size of the aluminum hydroxide of (B) is less than 10 micrometers. ### Claim 4 (depends on 2) The room temperature-curable organopolysiloxane composition according to claim 2 in which the average particle size of the aluminum hydroxide of (B) is less than 10 micrometers. ### Claim 5 (depends on 1) The room temperature-curable organopolysiloxane composition according to claim 1 in which the average particle size of the colloidal calcium carbonate is less than 1 micrometers. ### Claim 6 (depends on 2) The room temperature-curable organopolysiloxane composition according to claim 2 in which the average particle size of the colloidal calcium carbonate is less than 1 micrometers. ### Claim 7 (depends on 4) The room temperature-curable organopolysiloxane composition according to claim 4 in which the average particle size of the colloidal calcium carbonate is less than 1 micrometers. ### Claim 8 (depends on 7) The room temperature-curable organopolysiloxane composition according to claim 7 in which the hydrolyzable group is ketoximo. ### Claim 9 (depends on 8) The room temperature-curable organopolysiloxane composition according to claim 8 further comprising a catalyst to accelerate the cure between components (A) and (E). ### Claim 10 (depends on 9) The room temperature-curable organopolysiloxane composition according to claim 9 in which the catalyst is a metal salt of a monocarboxylic acid. ### Claim 11 (depends on 10) The room temperature-curable organopolysiloxane composition according to claim 10 in which the metal salt of monocarboxyic acid is dibutyltin dilaurate. ### Claim 12 (depends on 11) The room temperature-curable organopolysiloxane composition according to claim 11 in which the silicon compound is a mixture of N-beta(aminoethyl)-gamma-aminopropyltrimethoxysilane and vinyltris(methyl ethyl ketoximo)silane. ### Claim 13 (depends on 7) The room temperature-curable organopolysiloxane composition according to claim 7 in which the hydrolyzable group is alkoxy. ### Claim 14 (depends on 13) The room temperature-curable organopolysiloxane composition according to claim 13 in which the alkoxy is methoxy. ### Claim 15 (depends on 14) The room temperature-curable organopolysiloxane composition according to claim 14 further comprising a catalyst to accelerate the cure between components (A) and (E). ### Claim 16 (depends on 15) The room temperature-curable organopolysiloxane composition according to claim 15 in which the catalyst is a titanate. ### Claim 17 (depends on 16) The room temperature-curable organopolysiloxane composition according to claim 16 in which the titanium compound is diisopropoxybis(ethylacetoacetate)titanium. ### Claim 18 (depends on 2) The room temperature-curable organopolysiloxane composition according to claim 2 further comprising a chain extender.