Uretdione group-containing polyurethane oligomers and aqueous dispersions thereof

摘要

Uretdione group-containing polyurethane oligomers are prepared by reacting a hydroxyl-terminated prepolymer with a dicarboxylic acid anhydride. The hydroxyl-terminated prepolymer is the reaction product of a uretdione group-containing organic polyisocyanate with an isocyanate reactive hydrogen atom-containing compound. The polyurethane oligomers are useful in the preparation of aqueous polyurethane dispersions, which can be used as adhesives in making molded wood products, and as coatings and other useful products.