Polyurethanes

Details Polyurethanes Polyurethanes

1987-05-04

1988-04-19

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525102, 525440, 525446, 525453, 525474, 528 28, 528 29, 528 25, 528 42, 26433119, C08F 800

Patent

active

047390131

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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patent: 4202807 (1980-05-01), Moretto et al.
Annis et al, "An Elastomeric Vascular Prosthesis", Trans. Am. Soc. Artif. Intern. Organs, vol. XXIV, pp. 209-214, 1978.
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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