Flexible polyurethane foams and process for producing same

Details Flexible polyurethane foams and process for producing same Flexible polyurethane foams and process for producing same

1990-09-27

1993-01-26

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521117, 521127, 521129, 521163, 521168, 521170, C08G 1870, C08J 908

Patent

active

051823144

ABSTRACT:
A method for producing a flexible polyurethane foam by the reaction of an active-hydrogen-containing component composed of an active hydrogen compound, a blowing agent, and an additive with an organic polyisocyanate compound: said blowing agent being carbon dioxide which is generated by the reaction of water with free isocyanate groups, said organic polyisocyanate compound being a mixture of diphenylmethane diisocyanates and polyphenylmethane polyisocyanate, which the mixture contains said diphenylmethane diisocyanate and said polyphenylmethane polyisocyanate in a mixing ratio of not more than 1.0 and 4,4'-MDI in a ratio of not more than 60% by weight based on the whole isocyanate mixture, and said polyphenylmethane polyisocyanate having an average functionality (hereinafter referred to as "f") of not less than 2.9 and containing diphenylmethane diisocyanate in an amount of less than 35% by weight.

REFERENCES:
patent: 4256849 (1981-03-01), Ick et al.
patent: 4263411 (1981-04-01), Bak
patent: 4611083 (1986-09-01), Buethe et al.
patent: 4731392 (1988-03-01), Streu et al.
patent: 4806571 (1989-02-01), Knobel et al.
patent: 4816494 (1989-03-01), Watson, Jr. et al.
patent: 4937273 (1990-06-01), Okuyama et al.

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