Abstract: A storage stable one-component air curable urethane coating composition having improved color, abrasion resistance and weather resitance comprising at least twenty percent by weight of resin solids of a compound comprising at least one oxazolidine ring chemically combined from the nitrogen atom of the ring through an alkylene-urethane linking group to a tetramethylxylylenediisocyanate prepolymer radical.The invention also comprises the method for preparing the compound and composition and a method for coating a surface by applying the composition of the invention to the surface and exposing the applied composition to air having a relative humidity of at least 10% and incudes an article coated with the cured composition.

Abstract: A storage stable one-component air curable urethane coating composition having improved color and abrasion resistance comprising at least twenty percent by weight or resin solids of a compound comprising at least one oxazolidine ring chemically combined from the nitrogen atom of the ring through an alkylene-urethane linking group to an isophorone diisocyanate prepolymer radical.The invention also comprises the method for preparing the compound and composition and a method for coating a surface by applying the composition of the invention to the surface and exposing the applied composition to air having a relative humidity of at least 10% and includes an article coated with the cured composition.

Abstract: A thermally-stable polyurethane encapsulating resin system which comprises a polyurethane prepolymer made by reacting a polyisocyanate with a polyol to form an isocyanate-terminated prepolymer. A second component of the system is a curing polyol for reacting with the prepolymer to form a polyurethane polymer having pendant vinyl groups provided by the use in said system of a hydroxy-terminated diene polymer. The system also contains a drying oil having an iodine number of up to about 200 in an amount sufficient to reduce the viscosity of the composition and improve filler loading. The system also contains a peroxide catalyst in an amount sufficient to promote cross-linking of the pendant vinyl groups of the intermediate polyurethane polymer to provide a thermally-stable polyurethane resin product, and promote the reaction of the drying oil into the product during curing.

Abstract: A process is described for the preparation of urethane prepolymers from hydroxy-terminated diene polymers and normally liquid, relatively non-volatile, aromatic polyisocyanates. The prepolymers are made at a temperature above about 150.degree. C. to provide urethane prepolymer products that resist the tendency to form multiple phases or layers upon storage at room temperature.