Polyurethanes

Details Polyurethanes Polyurethanes

1988-02-12

1989-03-07

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

264205, 264211, 26421112, 524731, 528 76, 528 80, 528 83, C08G 1870

Patent

active

048107492

ABSTRACT:
Polyurethanes are provided which have a polymeric backbone including recurring urethane or urea groups or both and which are reaction products including macroglycols, diisocyanates, and preferably chain extending agents. The polyurethanes may take the form of poly(fluorosilicone urethanes) and include recurring organosilicone moieties from a fluoroalkylsiloxane reactant. When it is desired that these polyurethanes be capable of forming fibers in air, then the reactant charge should be such that the ratio of isocyanate equivalents to hydroxyl equivalents is less than 1.

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Leidner et al, "A Novel Process for the Manufacturing of Porous Grafts: Process Description and Product Evaluation", Journal of Biomedical Materials Research, vol. 17, pp. 229-247, 1983.

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