Modified isocyanate foams

Details Modified isocyanate foams Modified isocyanate foams

1974-09-23

1976-06-01

Ivy, C. Warren

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25AT, C08G 1876

Patent

active

039607887

ABSTRACT:
Modified isocyanurate foams having excellent thermal stability, low friability, adhesion, cell structure and the like are disclosed. The novel foams are obtained by the polymerization of a mixture of methylene-bridged polyphenylpolyisocyanates having an average functionality of about 2.1-2.4 consisting essentially of from about 60% to about 75% by weight methylene diphenylisocyanate having an isomer content consisting essentially of about 60 to about 80% 4,4'-isomer, about 18% to about 33% 2,4'-isomer, and about 2% to about 7% 2,2'-isomer by weight of the methylene diphenylisocyanate, and about 25% to about 40% by weight higher functionality methylene-bridged polyphenyl-polyisocyanates, in the presence of an isocyanurate group formation catalyst, a blowing agent and a polyether or polyester polyol. The novel foams are useful for preparing rigid components exposed to high temperatures and can be formulated to be fire resistant.

REFERENCES:
patent: 3344162 (1967-09-01), Rowton
patent: 3644232 (1972-02-01), Bernard
patent: 3676497 (1972-07-01), Recchia

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