Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
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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Brown N. Denise
Gil Joseph C.
Miles Inc.
Sergent Rabon
Welsh Maurice J.
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