Method of manufacturing polyurethane foam

Details Method of manufacturing polyurethane foam Method of manufacturing polyurethane foam

1989-07-13

1992-01-07

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521174, 521914, 521917, C08G 1808, C08J 900, C08J 904

Patent

active

050792768

ABSTRACT:
A method of manufacturing polyurethane foams comprising the steps of mixing a polyol and an organic isocyanate without causing them to substantially react with each other thereby to obtain a nonreacted mixture, mixing the nonreacted mixture with a foaming agent, a catalyst, a foam stabilizer and other necessary additives such as a pigment, a fire retardant and a filler, and injecting the resultant mixture to a mold to cause the resultant mixture to foam and crosslink. The polyol and the organic isocyanate may be preliminarily mixed with a gas such as an inert gas or air. The nonreacted mixture containing the polyol and organic isocyanate may be subjected to aging at a temperature of -10.degree. to 25.degree. C. for 12 to 27 hours.

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patent: 3821130 (1974-06-01), Barron et al.
patent: 4199547 (1980-04-01), Levinsky et al.
patent: 4410378 (1983-10-01), Hattori et al.

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