Polyurethane-modified polyisocyanurate foam and method for produ

Details Polyurethane-modified polyisocyanurate foam and method for produ Polyurethane-modified polyisocyanurate foam and method for produ

1981-03-06

1982-08-17

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, 521125, 521127, 521129, 521131, 521159, 521174, C08G 1814

Patent

active

043450423

ABSTRACT:
A polyurethane-modified polyisocyanurate foam having an excellent heat-resistance and flame-resistance and a reduced smoke-generation, comprises a reaction product of a mixture containing (A) at least one polyisocyanate compounds; (B) at least one polyol compound including, benzylic ether type phenolic resin of the formula (1): ##STR1## wherein R=H, hydrocarbon, oxyhydrocarbon or halogen, X=H or methylol, the molar ratio methylol/H.gtoreq.1, m+n.gtoreq.2 and m/m.gtoreq.1; p=1.about.3, (C) a trimerization catalyst, and; (D) a blowing agent, the ratio of the isocyanate equivalent of the isocyanate compound to the hydroxyl equivalent of the polyol compound being from 1.5 t 10.

REFERENCES:
patent: 3485797 (1969-12-01), Robins
patent: 3948824 (1976-04-01), Robins

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