Polyisocyanurate foam comprising reaction product of a polyisocyanate and a polyol mixture comprising a carboxylic ester polyol and a resole polyether polyol using a catalyst comprising dimethylethanolamine and an alkali metal salt of a carboxylic acid

摘要

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.