# US 5,710,192 A · Polydiene diols in resilient polyurethane foams > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,710,192 A - Document ID: US5710192A - Status: Granted - Kind: A - Application number: 08/724,940 - Filed: 1996-10-02 - Granted: 1998-01-20 - Earliest claimed: 1996-10-02 - Assignees: Shell Oil Company - Inventors: Hector Hernandez - Web page: https://patentgrep.com/patent/US5710192A ## CPC - C08G 18/6208: {Hydrogenated polymers of conjugated dienes} - C08G 18/69: Polymers of conjugated dienes {(hydrogenated polymers of conjugated dienes C08G18/6208)} - C08G 18/82: Post-polymerisation treatment - C08G 2110/0008: flexible - C08G 2110/0058: ≥50 and <150kg/m3 - C08G 2110/0066: ≥ 150kg/m3 - C08G 2110/0083: prepared using water as the sole blowing agent - C08G 2340/00: Filter material - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract Polyurethane foams having high resilience, significantly improved humid aging, excellent tear strength, and light color are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having a hydroxyl functionality from 1.6 to 2.0 and from an aromatic polyisocyanate having an isocyanate functionality of from 1.8 to 2.5. The polydiene diol is preferably blended with foaming agents prior to addition of the highly reactive polyisocyanate. ## Claims ### Claim 1 A polyurethane foam, produced by a process comprising the steps of: combining a polydiene diol having a number average molecular weight from 1,000 to 20,000, wherein between 30% and 70% of the polydiene diol forming monomers add by 1,4-addition, and a functionality of from 1.6 to 2 hydroxyl groups per molecule with an aromatic polyisocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule; and foaming the combined polydiene diol and aromatic polyisocyanate to form a resilient polyurethane foam. ### Claim 2 (depends on 1) A polyurethane foam according to claim 1, wherein the polydiene diol has a number average molecular weight of 3,000 to 6,000 and a functionality of from 1.8 to 2 hydroxyl groups per molecule. ### Claim 3 (depends on 1) A polyurethane foam according to claim 1, wherein the polydiene diol is hydrogenated and at least 90% of the carbon-carbon double bonds are saturated. ### Claim 4 (depends on 1) A polyurethane foam according to claim 1, wherein the polydiene diol is a polybutadiene diol. ### Claim 5 (depends on 3) A polyurethane foam according to claim 3, wherein the polydiene diol is a hydrogenated polybutadiene diol having from 40% to 60% 1,4-addition of butadiene. ### Claim 6 (depends on 1) A polyurethane foam according to claim 1, wherein the aromatic polyisocyanate has a functionality of 2.06. ### Claim 7 (depends on 1) A polyurethane foam according to claim 1, wherein foaming agents, at least one catalyst, and a surfactant are combined with the polydiene diol prior to combination of the polydiene diol and the aromatic polyisocyanate. ### Claim 8 (depends on 7) A polyurethane foam according to claim 7, wherein the foaming agents comprise water, the catalyst is selected from an amine catalyst, a tin catalyst, and mixtures thereof, and the surfactant is a silicone surfactant. ### Claim 9 (depends on 1) A polyurethane foam according to claim 1 further comprising aging the resilient polyurethane foam. ### Claim 10 A polyurethane foam, produced by a process comprising the steps of: mixing from 200 to 300 parts by weight of a polydiene diol having a number average molecular weight from 1,000 to 10,000, wherein between 30% and 70% of the polydiene diol forming monomers add by 1,4-addition and a functionality of from 1.8 to 2 hydroxyl groups per molecule with from 2 to 6 parts by weight of water, from 0.5 to 2 parts by weight of an amine catalyst, from 0.5 to 1.5 parts by weight of a tin catalyst, and from 0 to 1 parts by weight of a silicon surfactant; and adding to the polydiene diol from 90 to 110 index amount of an aromatic polymeric isocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule. ### Claim 11 (depends on 10) A polyurethane foam according to claim 10, wherein the polydiene diol is a hydrogenated polybutadiene diol having from 40% to 60% 1,4-addition of butadiene and at least 90% of the carbon-carbon double bonds are saturated. ### Claim 12 (depends on 11) A polyurethane foam according to claim 11, wherein the aromatic polymeric isocyanate has a functionality of 2.06. ### Claim 13 (depends on 10) A polyurethane foam according to claim 10, further comprising aging the polyurethane foam. ### Claim 14 A polyurethane foam, produced by a process comprising the steps of: mixing 200 to 300 parts by weight of a hydrogenated polybutadiene diol having a number average molecular weight from 3,000 to 6,000, from 40% to 60% 1,4-addition of butadiene, saturation of at least 90% of the carbon-carbon double bonds, and a functionality of from 1.8 to 2.0 hydroxyl groups per molecule with from 2 to 6 parts by weight of water, from 0.5 to 2 parts by weight of an amine catalyst, from 0.5 to 1.5 parts by weight of a tin catalyst, and from 0 to 1 parts by weight of a silicon surfactant; and adding to the hydrogenated polybutadiene diol from 90 to 110 index amount of an aromatic polymeric isocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule. ### Claim 15 (depends on 14) A polyurethane foam according to claim 14, wherein the aromatic polymeric isocyanate has a functionality of 2.06. ### Claim 16 (depends on 14) A polyurethane foam according to claim 14, further comprising aging the polyurethane foam. ### Claim 17 A polyurethane foam comprising: a hydrogenated polybutadiene diol having a number average molecular weight from 3,000 to 6,000, from 40% to 60% 1,4-addition of butadiene, saturation of at least 90% of the carbon-carbon double bonds, and a functionality of from 1.8 to 2.0 hydroxyl groups per molecule; water; an amine catalyst; a tin catalyst; a silicon surfactant; and an aromatic polymeric isocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule. ### Claim 18 (depends on 17) The polyurethane foam of claim 17, wherein the aromatic polymeric isocyanate has a functionality of 2.06. ### Claim 19 (depends on 10) A polyurethane foam according to claim 10 wherein 100 index amount of aromatic polyisocyanate is added to the polydiene diol. ### Claim 20 (depends on 14) A polyurethane foam according to claim 14 wherein 100 index amount of aromatic polyisocyanate is added to the polydiene diol.