Foamed polyisocyanurates

Details Foamed polyisocyanurates Foamed polyisocyanurates

1977-07-20

1983-09-20

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521118, 521131, 521160, C08G 1814

Patent

active

044057253

ABSTRACT:
Foams having improved flammability characteristics are prepared by reacting a polyaryl polyalkylene polyisocyanate with 2 to 15 parts of an active hydrogen compound having a molecular weight of from about 350 to about 10,000 and from one to six active hydrogen containing groups as determined by the Zerewitinoff method in the presence of a blowing agent, a stabilizer and a catalyst.

REFERENCES:
patent: 3516950 (1970-06-01), Haggis
patent: 3931065 (1976-01-01), Ashida et al.
Carwin, "Papi-Polymethylene Polyphenylisocyanate", Data Sheet of The Carwin Co., (now Upjohn Co.), published Dec. 1961.

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