Low-density polyurethane shoe soles or sole parts with high rebound resilience and low compression set

US9023910B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Heinrich Bollmann · Lehesten, DE
• Andre Kamm · Bohmte, DE
• Anand Huprikar · Novi, US
• Ulrich Holwitt · Osnabrück, DE

Key dates

• Filing date: Jan 18, 2013
• Grant date: May 5, 2015
• Expiry date: May 26, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for producing a polyurethane shoe sole having an article density of 100 to 350 g/L and being made from an organic polyisocyanate, a polyol, a blowing agent consisting of water, and optionally a crosslinking and/or chain-extending agent, a catalyst, and other auxiliaries and/or additives. First, polyisocyanate, polyol and any crosslinking and/or chain-extending agent are mixed and reacted at a temperature of 110° C. to 180° C. to give a prepolymer having polyisocyanate groups. Second, the isocyanate-terminated prepolymer obtained and any remaining polyisocyanate are mixed with any remaining polyol, blowing agent comprising water, and any remaining crosslinking and/or chain-extending agent and also any catalyst and other auxiliaries and/or additives are introduced into a mold and allowed to fully react to give a polyurethane shoe sole.