Production of polyurethane polymers, the polymers so produced, a

Details Production of polyurethane polymers, the polymers so produced, a Production of polyurethane polymers, the polymers so produced, a

1991-02-14

1992-09-15

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...

524590, 524591, 524839, 524840, 524871, 524874, 525453, 528 59, 528229, C08G 1812

Patent

active

051479257

ABSTRACT:
A polyurethane polymer having desired chain-pendant or in-chain groups Y is prepared by 1) converting terminal isocyanate groups of an isocyanate-terminated polyurethane prepolymer to groups providing carbon- or nitrogen-bound --NH.sub.2 and/or --NH-- groups, and 2) chain extending modified prepolymer formed in 1) with a compound having at least two enolic carbonyl groups and also having at least one group Y which becomes chain-pendant or in-chain in the chain-extended polymer.

REFERENCES:
patent: 4555561 (1985-11-01), Sugimori
patent: 5002998 (1991-03-01), Carey

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