Isocyanate-terminated prepolymers and rigid-foams produced there

Details Isocyanate-terminated prepolymers and rigid-foams produced there Isocyanate-terminated prepolymers and rigid-foams produced there

1998-06-10

1999-10-05

Gorr, Rachel

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521159, 156 77, 156 78, 156 79, C08G 1810

Patent

active

059625414

ABSTRACT:
NCO-terminated prepolymers are made by reacting a polymeric diphenylmethane diisocyanate (PMDI) and a polyol having a functionality of from about 1.8 to about 4.0 and a molecular weight of from about 400 to about 2,000. The PMDI and polyol are reacted in amounts such that the equivalent ratio of isocyanate groups to hydroxyl groups is from about 15:1 to about 160:1. These prepolymers are useful in the production of polyurethane foams, particularly laminated foams.

REFERENCES:
patent: 4791148 (1988-12-01), Riley et al.
patent: 5362764 (1994-11-01), Londrigan et al.

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