B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/195
B32B 27/12 (2006.01) C08G 18/65 (2006.01) C08G 18/72 (2006.01)
Patent
CA 1132862
ABSTRACT OF THE DISCLOSURE A polyurethane elastomer which comprises a reaction product of (A) a polymeric diol having a molecular weight of about 800-5000, (B) a mixture of organic diisocyanates wherein about 2-70 mol % is composed of aliphatic diisocyanate (said aliphatic diisocyanate having no direct bond between an aromatic ring and an isocyanate group) and wherein the balance 98-30 mol % is composed of aromatic diisocyanate which includes a direct bond between an aromatic ring and an isocyanate group, and (C) a chain ex- tender comprising hydrazine and/or a derivative having the formula NH2NHR and another chain extender having two functional groups constituting amino and/or hydroxyl groups, and wherein about 30-80% of the carbon atoms which are bonded to nitrogen atoms constituting the ureylene and/or ure- thane bonds of said polyurethane elastomer constitute benzene and/or naph- thalene ring skeletons, and wherein about 2-70% of the ureylene bonds of said polyurethane elastomer are formed by the reaction of aliphatic diiso- cyanate and hydrazine and/or its derivative having the formula NH2NHR. The polyurethane elastomer may be used to impregnate a fibrous sheet for the formation of a composite sheet material having improved durability.
320516
Shimizu Kitao
Tanaka Minoru
Yagi Kenkichi
Smart & Biggar
Toray Industries Inc.
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