Method for producing liquid urethane prepolymer and resin composition
AssigneeDainippon Ink and Chemicals, Inc.
InventorsYasuhiro Matsumoto, Hideyuki Takeuchi, Hiroki Tanaka
Life of this patent
Estimating the term…
Abstract
A method for producing an isocyanate group-blocked liquid urethane prepolymer which comprises: reacting a lactone-modified diol (3) with a polyfunctional isocyanate (4) to form an isocyanate group-having urethane prepolymer (5), wherein said lactone-modified diol (3) is obtainable by ring-opening addition polymerization of a lactone monomer (2) with a diol (1) selected from the group consisting of a polyalkylene ether diol, a polyester diol and a polycarbonate diol; and then reacting said urethane prepolymer with a blocking agent (6).
Claims9
A method for producing a liquid urethane prepolymer which comprises:
- reacting a lactone-modified diol (3) with a polyisocyanate (4) to form a urethane prepolymer precusor having an isocyanate group (5), wherein said lactone-modified diol (3) is obtained by ring-opening addition polymerization of a lactone monomer (2) with a diol (1) selected from the group consisting of a polyalkylene ether diol and a polyester diol obtained by reaction of a dihydric alcohol with a dibasic carboxylic acid;
- and then
- reacting said urethane prepolymer precursor (5) with a blocking agent (6) to obtain the liquid urethane prepolymer having the isocyanate group blocked by the blocking agent.
Dependencies are inferred from the claim text.