Method of preparing polyurethane foam of low thermal conductivit

Details Method of preparing polyurethane foam of low thermal conductivit Method of preparing polyurethane foam of low thermal conductivit

1994-06-15

1996-06-25

Seidleck, James J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521155, 521163, 521164, 528 48, 528 52, 528 76, 528 85, 524196, 524198, C08G 1800

Patent

active

055300359

ABSTRACT:
Closed cell polyurethane foams, useful as thermal insulation for refrigerators and the like, are prepared by blending a polyisocyanate, a polyol and a suspension of at least one solid alkaline reagent, preferably sodium hydroxide, in an inert carrier liquid having a suitable viscosity. Preferred carrier liquids include polyepoxides and polyoxyalkylenediamines. The alkaline reagent reacts with and removes the carbon dioxide employed as a blowing agent, thus decreasing the thermal conductivity of the foam.

REFERENCES:
patent: 5278195 (1994-01-01), Volkert et al.
patent: 5371113 (1994-12-01), Ward, III et al.

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