High modulus, high impact polyurethane/polyurea rim

Details High modulus, high impact polyurethane/polyurea rim High modulus, high impact polyurethane/polyurea rim

C - Chemistry, Metallurgy

08

G

C08G 18/75 (2006.01) C08G 18/10 (2006.01) C08G 18/16 (2006.01) C08G 18/32 (2006.01) C08G 18/66 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2205252

This invention relates to a process for the production of polyurethane/urea moldings which exhibit both high flexural modulus and high impact strength. The process comprises reaction injection molding of a reaction mixture in the presence of a catalyst via the one-shot process. The isocyanate component of this invention is a prepolymer of methylenebis(cyclohexyl isocyanate) having an NCO content of 12-27%, an average isocyanate functionality of less than 2.3, a monomer content of greater than about 25% by weight, and containing urethane or urea groups. The isocyanate-reactive blend comprises a high molecular weight polyether polyol and a low molecular weight chain extender, wherein the isocyanate-reactive blend has an OH:NH equivalent ratio of from 1:1 to 15:1. This invention also relates to the polyurethane/urea molded article produced by the above process.

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