Polyisocyanurate foam comprising reaction product of a polyisocy

Details Polyisocyanurate foam comprising reaction product of a polyisocy Polyisocyanurate foam comprising reaction product of a polyisocy

1978-09-15

1980-01-15

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521125, 521173, C08G 1814

Patent

active

041840224

ABSTRACT:
Rigid cellular urethane-modified polyisocyanurate foam products, a cocatalyst system and manufacturing methods are disclosed. The foams are the reaction product of polynuclear aromatic polyisocyanate material and polyol material with the polyisocyanate material being present in sufficient amount to provide isocyanurate groups as the major recurring polymer unit. The polyol comprises a mixture of diethylene glycol esters of biphenyl di and tri carboxylic acids and a resole-type polyether polyol. A catalytic amount of a binary catalyst comprising dimethyl ethanolamine and commercially available E9403 is incorporated in the reaction mixture along with a halocarbon blowing agent; a cell modifier; and a flame retardant material; to produce a cured foam having low flame spread rate and low smoke evolution.

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