C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/141, 402/154
C08G 18/32 (2006.01) C08G 18/10 (2006.01) C08G 18/38 (2006.01) C08G 18/65 (2006.01)
Patent
CA 1311575
Mo-3078 LeA 25,609 A PROCESS FOR THE PRODUCTION OF HEAT-RESISTANT POLYURETHANE UREA ELASTOMERS ABSTRACT OF THE INVENTION The present invention is directed to a process for the production of a polyurethane urea elastomer which comprises preparing a heterogeneous mixture of a) a diaminodiphenylurea corresponding to the formula Image wherein R1, R2, R3 and R4, which may be the same or different, represent hydrogen or a C1-C6 alkyl radical and wherein the amino groups are in the meta and/or para position to the urea group and b) an NCO-terminated prepolymer prepared from a polyisocyanate and a polyhydroxyl compound having a molecular weight of 400 to about 10,000, and subsequently reacting the heterogeneous system to form a polyurethane urea elastomer by heating the mixture to a temperature below the melting point of said diaminodiphenylurea. The present invention is also directed to heterogeneous reaction mixtures based on the above diaminodiphenylureas suspended in the above NCO-terminated prepolymers. LeA 25.609
578037
Grogler Gerhard
Hess Heinrich
Ruckes Andreas
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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