Foams produced under reduced pressure and method of preparing su

Details Foams produced under reduced pressure and method of preparing su Foams produced under reduced pressure and method of preparing su

1994-01-10

1995-08-08

Schofer, Joseph L.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 451, 264 48, 4283044, 521 79, 521142, 521143, 521146, 521149, 521155, 521180, 521189, C08J 900, C08J 908

Patent

active

054399459

ABSTRACT:
Foams are prepared under reduced pressure and are subsequently encased in a material which will prevent ambient air from entering the cell voids. In the most preferred embodiment of the invention a polyurethane or polyisocyanurate foam is formed by mixing the polyol and isocyanate components under reduced pressure, allowing the gas within the foam to reach equilibrium at a lesser pressure then in prior systems. The need for blowing agents is substantially reduced and the K-factor of such foams is highly desirable. The foams are particularly well suited for use in refrigeration applications where the foams can be encased to prevent air from entering the cells after curing of the foam.

REFERENCES:
patent: 4223068 (1980-09-01), Carlstrom et al.
patent: 4417001 (1983-11-01), Svoboda et al.
patent: 4444919 (1984-04-01), Brennan
patent: 4469824 (1984-09-01), Grigsby, Jr. et al.
patent: 4604410 (1986-08-01), Altenberg
patent: 4710521 (1987-12-01), Soukup et al.
patent: 4743417 (1988-05-01), Bakkelunn
patent: 5137929 (1992-08-01), Demmin et al.

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