Manufacture of polyurethane foam

Details Manufacture of polyurethane foam Manufacture of polyurethane foam

1989-12-26

1991-08-27

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521160, 521163, 521165, 521167, 521172, 521174, C08G 1814

Patent

active

050433601

ABSTRACT:
Substantially water blown flexible polyurethane foams, based on methylene diphenyl isocyanates, having a density ranging from 15-45 kg/m.sup.3. Such foams may be obtained through a process substantially avoiding halocarbon blowing agents, which comprises reacting methylene diphenyl isocyanates with water and one or more isocyanate-reactive compounds selected from polyols and polyamines with a functionality of 2-4 and an average equivalent weight ranging from 750-5000, while the isocyanate index ranges from 10 to 60, and weight ratio of the isocyanate-reactive compound(s) to water is less than 20.

REFERENCES:
patent: 4384050 (1983-05-01), Guthrie

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