Flexible, combustion-modified, polyurethane foams

Details Flexible, combustion-modified, polyurethane foams Flexible, combustion-modified, polyurethane foams

1992-06-02

1993-07-20

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521160, 521174, 521906, C08J 908, C08G 1876

Patent

active

052294277

ABSTRACT:
Polyurethane foams of excellent properties are produced by reacting a) one or more polyether polyols, b) a polymethylene poly(phenyl isocyanate) having a methylene-bis(phenyl isocyanate) content of from 70 to 77% by weight, c) melamine, d) a phosphorous containing compound and d) water as the blowing agent. The isocyanate must have a specific 4,4' to 2,4'-isomer ratio and the amounts of melamine and phosphorous must be within narrowly defined limits.

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