Method and apparatus for the production of essentially void free

Details Method and apparatus for the production of essentially void free Method and apparatus for the production of essentially void free

1997-10-29

1998-09-01

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 50, 264 53, 521155, C08J 900, C08J 914, C08G 1814

Patent

active

058012109

ABSTRACT:
A process for the manufacture of polyurethane foam comprising the steps of (i) mixing at a reaction index of 40 to 400: (a) a polyisocyanate blend comprising at least one polyisocyanate and optionally, additives and fillers; (b) a polyol blend comprising isocyanate reactive components and optionally, water, additional blowing agents, catalysts, surfactants, fillers and other additives; wherein either or both said polyisocyanate blend or said polyol blend contain between 0.3 to about 20 wt. % CO.sub.2 based on the total weight of said polyisocyanate blend and said polyol blend; (ii) introducing and uniformly mixing in liquid form of CO.sub.2 as a blowing agent into either or both said polyisocyanate blend or said polyol blend and maintaining said CO.sub.2 in said liquid form. The present invention also relates to an apparatus, which performs the above-mentioned process.

REFERENCES:
patent: 4906672 (1990-03-01), Stone et al.
patent: 5120770 (1992-06-01), Doyle et al.
patent: 5578655 (1996-11-01), Fiorentini
patent: 5620710 (1997-04-01), Fiorentini et al.
patent: 5629027 (1997-05-01), Fiorentini et al.

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