STORAGE-STABLE POLYOL COMPOSITIONS FOR PRODUCING RIGID POLYISOCYANURATE FOAM

摘要

Disclosed is a polyol composition comprising an aliphatic polyester polyol having a hydroxyl value of less than about 100 and prepared by the reaction of at least a polycarboxylic acid with a polyhydroxy compound; an aromatic polyester polyol; a Novolac-type polyether polyol; and a hydrofluorocarbon blowing agent; that may be storage-stable for at least 60 days. This composition may be reacted with a polyisocyanate at an isocyanate index of from about 2.5 to about 4 to form a rigid polyisocyanurate foam. The foam shows improved cohesion in general and also improved adhesion and a reduced incidence of voids when applied to a metal substrate.