# US 2013/0210950 A1 · Reaction system for preparing polyurethane microcellular foam, a polyurethane microcellular foam and the use thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0210950 A1 - Document ID: US20130210950A1 - Status: Published application - Kind: A1 - Application number: 13/813,441 - Filed: 2011-08-01 - Published: 2013-08-15 - Earliest claimed: 2010-08-02 - Assignees: Bayer Intellectual Property GmbH - Inventors: Hartmut Nefzger; Zhiping Zhou; John Zhang; Jingui Shi - Web page: https://patentgrep.com/patent/US20130210950A1 ## CPC - C08G 18/4236: {containing only aliphatic groups} - C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step - C08G 18/4202: {Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence)} - C08G 18/425: {the polyols containing one or two ether groups} - C08G 18/725: {Combination of polyisocyanates of C08G18/78 with other polyisocyanates} - C08G 18/7671: {containing only one alkylene bisphenyl group} - C08G 18/797: {containing carbodiimide and/or uretone-imine groups} - C08J 9/04: using blowing gases generated by a previously added blowing agent - C08J 9/12: by a physical blowing agent - C08G 2110/0008: flexible - C08G 2110/0066: ≥ 150kg/m3 - C08G 2110/0083: prepared using water as the sole blowing agent - C08G 2410/00: Soles - C08J 2205/044: Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter - C08J 2375/04: Polyurethanes - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) ## Abstract The present invention relates to a reaction system for preparing polyurethane microcellular foam, a polyurethane microcellular foam and the use thereof. The reaction system for preparing polyurethane microcellular foam comprises isocyanate prepolymer, polyols, catalysts and chain extenders. The isocyanate prepolymer is a reaction product of polyisocyanates and polyester polyols, wherein the polyester polyols comprise 10-60 wt. % succinic acid units, based on 100 wt. % of the polyester polyols, the NCO content of the isocyanate prepolymer is 13-30 wt. %, based on 100 wt. % of isocyanate prepolymer. By using the reaction components provided in the present invention, the demould time for preparing the polyurethane microcellular foam can be reduced. The obtained polyurethane microcellular foam, which possesses good physical and mechanical properties, is particularly suitable to prepare shoes. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 A reaction system for preparing polyurethane microcellular foam, comprising a component A and a component B, wherein component A comprises an isocyanate prepolymer, comprising a reaction product of reactant components as follows: a1) one or more polyisocyanates; a2) one or more polyester polyols, wherein the polyester polyols comprise 10 to 60 weight % succinic acid units of the formula (I), based on 100 weight % of the polyester polyols; wherein the isocyanate prepolymer has a NCO content from 13 to 30 weight %, based on 100 weight % of isocyanate prepolymer; and component B comprises: b1) one or more polyols; b2) from 0.001 to 10 weight % of one or more catalysts, based on 100 weight % of polyurethane microcellular foam; and b3) one or more chain extenders. ### Claim 17 (depends on 16) The reaction system as claimed in claim 16, wherein component B further comprises one or more additives selected from the group consisting of: b4) one or more blowing agent; and b5) from 0.01 to 5 weight % of one or more surfactants, based on 100 weight % of polyurethane microcellular foam. ### Claim 18 (depends on 16) The reaction system as claimed in claim 16, wherein the polyester polyols comprise from 40 to 53 weight % of the succinic acid units, based on 100 weight % of polyester polyols. ### Claim 19 (depends on 16) The reaction system as claimed in claim 16, wherein the NCO content of the isocyanate prepolymer is from 16 to 20 weight %, based on 100 weight % of isocyanate prepolymer. ### Claim 20 A polyurethane microcellular foam comprising a reaction product of reaction component A and reaction component B, wherein component A comprises an isocyanate prepolymer comprising the reaction product of reactant components as follows: a1) one or more polyisocyanates; a2) one or more polyester polyols, wherein the polyester polyols comprise from 10 to 60 weight % succinic acid units of the formula (I), based on 100 weight % of the polyester polyols; wherein the isocyanate prepolymer has a NCO content from 13 to 30 weight %, based on 100 weight % of isocyanate prepolymer; and component B comprises: b1) one or more polyols; b2) from 0.001 to 10 weight % of one or more catalysts, based on 100 weight % of polyurethane microcellular foam; and b3) one or more chain extenders. ### Claim 21 (depends on 20) The polyurethane microcellular foam as claimed in claim 20, wherein component B further comprises one or more additives selected from the group consisting of: b4) one or more blowing agent; and b5) from 0.01 to 5 weight % of one or more surfactants, based on 100 weight % of polyurethane microcellular foam. ### Claim 22 (depends on 20) The polyurethane microcellular foam as claimed in claim 20, wherein the polyester polyols comprise from 40 to 53 weight % of the succinic acid units, based on 100 weight % of polyester polyols. ### Claim 23 (depends on 20) The polyurethane microcellular foam as claimed in claim 20, wherein the NCO content of the isocyanate prepolymer is from 16 to 20 weight %, based on 100 weight % of isocyanate prepolymer. ### Claim 24 (depends on 20) The polyurethane microcellular foam as claimed in claim 20, wherein the polyurethane microcellular foam has a density from 150 to 1100 kg/m3. ### Claim 25 An isocyanate terminated prepolymer, comprising a reaction product of a reaction system comprising reaction components as follows: a1) one or more polyisocyanates; a2) one or more polyester polyols, wherein the polyester polyols comprise from 10 to 60 weight % succinic acid units of the formula (I), based on 100 weight % of the polyester polyols; wherein the isocyanate prepolymer has a NCO content from 13 to 30 weight %, based on 100 weight % of isocyanate prepolymer. ### Claim 26 (depends on 25) The isocyanate terminated prepolymer as claimed in claim 25, wherein the polyester polyols comprise from 40 to 53 weight % of the succinic acid units, based on 100 weight % of polyester polyols. ### Claim 27 (depends on 25) The isocyanate terminated prepolymer as claimed in claim 25, wherein the NCO content of the isocyanate prepolymer is from 16 to 20 weight %, based on 100 weight % of isocyanate prepolymer. ### Claim 28 (depends on 16) A method for preparing a polyurethane microcellular foam comprising utilizing the reaction system as claimed in claim 16. ### Claim 29 (depends on 20) A method for preparing a shoe comprising utilizing the polyurethane microcellular foam as claimed in claim 20. ### Claim 30 (depends on 25) A method for preparing a polyurethane comprising utilizing the isocyanate terminated prepolymer as claimed in claim 25.