C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/141, 403/34,
C08G 18/66 (2006.01) B29C 45/00 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/50 (2006.01) C08G 18/76 (2006.01) C08J 9/06 (2006.01)
Patent
CA 2014924
The present invention relates to a process for the production of an optionally cellular elastomeric molded article having a compact surface and based on a polyurea elastomer containing urethane groups which is the reaction product of a) a polyisocyanate component based on a polyisocyanate of the diphenylmethane series, b) a polyol component based on a polyether polyol, a polyester polyol or mixtures thereof and c) a polyamine component containing 1) 50 to 95% by weight, based on the weight of component c), of at least one sterically hindered aromatic diamine and 2) 5 to 50% by weight, based on the weight of component c), of at least one compound which has a molecular weight of about 1,000 to 12,000, by reacting component a) with at least 90% by weight of component b) at an NCO/OH equivalent ratio of at least 4:1 to form an NCO semi-prepolymer and subsequently reacting the NCO semi-prepolymer with component c) and the remainder of component b) by the reaction injection molding process to form the polyurea elastomer containing urethane groups, component c) being present in an amount sufficient to provide an isocyanate index, based on the reactive groups of components a), b) and c), of 10 to 130.
Boden Heinrich
Meiners Hans-Joachim
Ruckes Andreas
Schmidt Manfred
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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