Density reduction in flexible polyurethane foams

Details Density reduction in flexible polyurethane foams Density reduction in flexible polyurethane foams

1989-08-16

1991-04-09

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, C08G 1814

Patent

active

050065696

ABSTRACT:
Improved, flexible, open-celled polyurethane foams of reduced density, but with stability and firmness characteristics comparable to those of standard foams, are described. The foams are formed in situ from the reaction, in the presence of a catalyst, of an isocyanate, one or more blowing agents including water, a foam stabilizer, a polyether polyol, and a liquid salt produced from the reaction of CO.sub.2 with a water-soluble amine or amino alcohol. Preferred amines or amino alcohols for the CO.sub.2 salt include primary amines and polyols which contain primary amino end groups, secondary amines which contain primary hydroxyl groups, and a variety of low molecular weight aminohydroxy compounds. The liquid salt is present in the foam formulations in an amount of at least 2 parts by weight per 100 parts by weight of polyol.

REFERENCES:
patent: 4284728 (1981-07-01), Demos et al.
patent: 4500656 (1985-04-01), Rasshofer et al.
patent: 4735970 (1988-06-01), Sommerfield et al.
patent: 4876292 (1989-10-01), Milliren

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