METHOD FOR PRODUCING AQUEOUS POLYURETHANE RESIN, AQUEOUS POLYURETHANE RESIN AND FILM

• Main Authors: YAMAZAKI SATOSHI, HONMA SHIRO, KUWAMURA GORO, NAKAGAWA TOSHIHIKO, SUGANO TAKASHI
• Format: Patent
• Language: English
• Published: 30.09.2010
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for producing a aqueous polyurethane resin without substantially using organic solvents, the aqueous polyurethane resin produced by the method, and a film produced from the aqueous polyurethane resin. SOLUTION: The method for producing the aqueous polyurethane resin comprises: a synthesizing step to react a polyisocyanate with an active hydrogen group-containing compound having multiple active hydrogen groups at an equivalent ratio of the isocyanate group of the polyisocyanate to the active hydrogen group of the active hydrogen group-containing compound of 1.2-4, wherein a nonionic group side chain is introduced to at least one of the polyisocyanate and the active hydrogen group-containing compound, and synthesize a nonionic group-containing prepolymer having a concentration of the nonionic group introduced to the side chain of ≥0.9 mass%; and an emulsification/dissolution step to stir the nonionic group-containing prepolymer and water with a vibration mixer to obtain an emulsion or aqueous solution of the nonionic group-containing prepolymer. COPYRIGHT: (C)2010,JPO&INPIT