Process for the preparation of optionally cellular...

Details Process for the preparation of optionally cellular... Process for the preparation of optionally cellular...

C - Chemistry, Metallurgy

08

G

402/142, 403/34

C08G 18/32 (2006.01) C08G 18/65 (2006.01)

Patent

CA 1266743

ABSTRACT OF THE DISCLOSURE: A process for the preparation of cellular, microcellular and noncellular polyurethane polyurea molded parts involves the reaction of organic polyisocyanates, polyols having at least 2 reactive hydrogen atoms, and a chain extender containing at least 70 percent by weight of a mixture of aromatic diamines. These diamines comprise from 80 to 50 weight percent of at least one primary aromatic diamine whose amino groups are sterically hindered relative to reaction with polyisocyanates, and 20 to 50 weight percent of at least one unsubstituted or substituted reactive primary aromatic diamine whose amino groups do not exhibit reduced reactivity to polyisocyanates. The thus produced polyurethane polyurea polymers have excellent demoldability avoiding the use of external mold release agents.

474434

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