Foamed polyurethane-forming composition, foamed polyurethane and

Details Foamed polyurethane-forming composition, foamed polyurethane and Foamed polyurethane-forming composition, foamed polyurethane and

1993-12-27

1995-03-28

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521120, 521123, 521124, 521133, 521137, 521172, 521175, C08G 1808

Patent

active

054017858

ABSTRACT:
Foamed polyurethanes substantially free from non-uniform density distribution are obtained by dispersing an inert gas with mechanical stirring into a foamed polyurethane-forming composition containing substantially no blowing agent and comprising (1) an organic polyisocyanate component, (2) a polyol component comprising a high molecular weight polyol (A1) and a low molecular weight polyol (A2), (3) a dehydrating agent (B) and optionally organic microballoons, and curing the resulting composition containing therein the inert gas substantially homogeneously distributed. Foamed polyurethanes thus obtained are lightweight and of reduced warpage after processing and are suitable for model materials.

REFERENCES:
patent: 3928258 (1975-12-01), Alexander
patent: 4038238 (1977-07-01), Cravens
patent: 4275172 (1981-06-01), Barth et al.
patent: 4857368 (1989-08-01), Klein
patent: 4882363 (1989-11-01), Neuhaus

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