Control of hard segment size in polyurethane formation

Details Control of hard segment size in polyurethane formation Control of hard segment size in polyurethane formation

1990-11-27

1992-07-07

Kight, III, John

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 44, 528 48, 523106, 351160R, C08G 1810, C08G 1832

Patent

active

051284340

ABSTRACT:
Improved methods for forming urethane elastomers and corresponding urethane prepolymers are disclosed wherein diisocyanate and a low molecular weight diol are simultaneously mixed and reacted to form a hard segment which is subsequently reacted with a long chain diol to form the elastomer. Aliphatic diisocyanates are particularly desirable for the manufacture of contact lenses from the urethane prepolymers of this invention.

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