Abstract: A polycarbodiimide-polyisocyanurate foam is prepared by reacting(A) mixture of a polyol blend comprising(a) 25 to 100% of an aromatic polyester polyol having the following structure: ##STR1## where n=1, 2, or 3 and having hydroxyl number 150 to 330, (b) 0 to 35% of a flexible polyether polyol with hydroxyl number 20 to 70,(c) 0 to 25% of a toluene diamine ethoxylated polyol, optionally with some propoxylate, and having hydroxyl number 330 to 480,(d) 0 to 25% of a nonyl phenol ethoxylate and having hydroxyl number 70 to9 150, andwith surfactant, catalyst, and water; and reacting with(B) a polyphenyl polymethylene polyisocyanate such that the mixture of A is reacted with B at a 1:1 by volume mix ratio.

Abstract: The present invention is directed to a polyol blend comprising:(a) from about 30 to about 90 percent by weight of a polyester diol having an OH number of from about 50 to about 500 and having the structure: ##STR1## wherein each R may be the same or different and represents a radical of the formula: ##STR2## where R" represents H or CH.sub.3 with the proviso that both R"s cannot be CH.sub.

Abstract: Vinyl terminated, fully reacted urethane compositions comprise the reaction product of polyisocyanate, an hydroxyalkylated novolac and an ethylenically unsaturated alcohol. The vinyl terminated compositions are copolymerizable with ethylenically unsaturated monomers to produce thermoset polymers characterized by excellent physical properties and a high degree of resistance to acids and alkalies. The polymers are especially useful in the manufacture of molded articles and laminates and in the formulation of marine coatings.