Blowing agent and process for preparing polyurethane foam

Details Blowing agent and process for preparing polyurethane foam Blowing agent and process for preparing polyurethane foam

1991-08-19

1992-03-03

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 98, 521131, 521910, C08J 914

Patent

active

050933779

ABSTRACT:
The use of 1,1-difluoroethane (HFC-152a) and dimethyl ether, optionally with up to 50 mole % of water, as the blowing agent is disclosed as an efficient route to a rigid, closed-cell polyurethane or polyisocyanurate foam of improved cell structure and excellent insulation properties.

REFERENCES:
patent: 4303758 (1981-12-01), Gusmer
patent: 4422877 (1983-12-01), Spitzer et al.
patent: 4996240 (1991-02-01), Osipow et al.
patent: 5401287 (1991-08-01), Drigger et al.

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