Repeating block, oligomer-free, polyphase, thermoformable polyur

Details Repeating block, oligomer-free, polyphase, thermoformable polyur Repeating block, oligomer-free, polyphase, thermoformable polyur

1985-10-07

1986-11-04

Welsh, Maurice J.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

252182, 528 67, 528 76, C08G 1810

Patent

active

046211136

ABSTRACT:
Polyphase, transparent, polyblock, oligomer-free, segmented urethane polymers having molecular weights of from about 100,000 to about 200,000 and being eminently suited for use in medical devices such as blood bags, etc., are deriveable from chain extenders, free diisocyanate molecules and prepolymers consisting essentially of linear molecules which are terminated at each end by isocyanate groups. The prepolymer molecules consist of n branched, polyether glycol residues joined through intervening carbamate groups with (n+1) diisocyanate residues, n ranging from about 1 to 4 and having an average value of less than 2. The polyether glycols have molecular weights of from about 1000 to about 6000 and are methylol-terminated chains of C.sub.3 -C.sub.6 alkylene oxide units. Importantly, the final polymers are free of domain crystallinity.

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