Polyoxyalkylene/unsaturated diester reaction product for cellular foam stabilization

Claim 1

A laminated structural panel having at least one facing sheet and having a foam material adhering to the facing sheet wherein the foam material comprises the reaction product of: A. polymer forming reactants selected from the group consisting of phenolic, polyisocyanurate and polyurethane polymer forming reactants, B. a blowing agent, and C. a surfactant which comprises the reaction product of (a) a polyoxyalkylene adduct having the formula H--polyoxyalkylene chain--.sub.t R, wherein R is an organic or inorganic radical and t is the number of polyoxyalkylene chains reacted onto R, and (b) an esterified unsaturated dibasic acid having the formula T.sup.1 O.sub.2 C--C.sub.u H.sub.2u-2 --CO.sub.2 T.sup.2 wherein u is 2 or 3 and T 1 and T 2 are identical or different and represent a straight or branched, saturated or unsaturated hydrocarbon chain, in the presence of an effective amount of a free-radical initiator, and wherein the polyoxyalkylene adduct optionally is capped by treatment either before or after its reaction with the esterified unsaturated dibasic acid with a capping agent capable of reacting with the hydroxyl groups of said adduct to reduce the hydroxyl number of said adduct to less than 50.