Abstract: A process for preparing an adhesive, transparent, corrosion and abrasion resistant polymeric coating on a substrate, such as a glass, plastic or metal such as aluminum or steel. The substrate is coated with a mixture of up to about 15% by weight of an expanding polycyclic monomer such as a spiroorthocarbonate or spiroorthoester, a diepoxy oligomer such as a diglycidyl ether, and a lactone in a concentration of from about 1:2.5 to 1:4.5 by weight of the oligomer. To this mixture is added a catalytic quantity of a boron trihalide-amine complex and a catalytic quantity of an aromatic photocatalyst which releases a carbonium ion upon ultraviolet irradiation. The coated substrate is exposed to broad wavelength UV light for from about 2 to 20 seconds to initiate polymerization. Polymerization of the coating is completed by heating the coated substrate at a temperature of from about 50.degree. to 120.degree. C.

Abstract: Novel stable substantially linear unsaturated polyurethane resins which lend themselves to polymerization, in air, by actinic light using low levels of photo-initiator and with no amine activator, said resins having a tertiary amine group and a terminal vinylidene group, i.e. H.sub.2 C .dbd. C< by the reaction of an isocyanate with a hydroxyalkyl acrylate or an allyl alcohol monomer. Both the resin and the cured products therefrom have little or no detectable amine odor.