Process for preparing flexible CFC-free polyurethane foams using

Details Process for preparing flexible CFC-free polyurethane foams using Process for preparing flexible CFC-free polyurethane foams using

1991-11-01

1996-12-17

Lovering, Richard D.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

25218224, 25218225, 252307, 252350, 521 76, 521127, 521133, 521159, C08J 908, C08J 900, C08J 912

Patent

active

055854125

ABSTRACT:
The present invention relates to a process for producing a flexible polyurethane foam by reacting, at a reaction temperature within a temperature range of between about 70.degree. F. and about 150.degree. F., a reaction mixture comprised of a polyol, an organic isocyanate, water, an encapsulated blowing agent, and a reaction catalyst, wherein the encapsulated blowing agent comprises a shell and a core, said shell comprising a polymer having a melting point above the initial reaction temperature, and said core comprising a gaseous blowing agent or blowing agent precursor for blowing said reaction mixture at said reaction temperature. In another aspect, the present invention relates to a process for cooling a hot polyurethane foam utilizing encapsulated water contained in the foam forming reaction mixture.

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patent: 4417998 (1983-11-01), Kennedy
patent: 4442235 (1984-04-01), Taylor et al.
patent: 4965029 (1990-10-01), Lidy et al.

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