Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1989-03-06
1990-08-21
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521170, 521173, 521174, 521176, 528 49, C08G 1814
Patent
active
049506951
ABSTRACT:
Improved, flexible, open-celled polyurethane foams of reduced firmness, but with densities comparable to those of standard foams, are described. The foams are formed in situ from the reaction of isocyanate, one or more blowing agents including water, a foam stabilizer, polyether polyols or polyester polyols or a mixture of these polyols, and monofunctional materials chemically analogous to the polyols, in the presence of a catalyst. The monofunctional materials can be alcohols, polyesters, or polyethers. Useful monofunctional alcohols have carbon chain lengths of at least 3, and preferably from 8 to 20. Useful monofunctional polyesters have molecular weights from 300 to 2000, and preferably from 300 to 800. Useful monofunctional polyethers, which are derived from the reaction of a monofunctional alcohol with propylene oxide and/or ethylene oxide, have molecular weights from 100 to 3000, and preferably from 200 to 1800.
REFERENCES:
patent: 3875086 (1975-04-01), Remey et al.
patent: 4376832 (1983-03-01), Speranza et al.
PMC, Inc.
Welsh Maurice J.
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