Patent ID: 9200179
Filing Date: 2015-12-01
Classification: B29C,B31B,B32B,C08G,C09D

Abstract:
1. A polyurethane dispersion obtained by aqueously dispersing an aqueous polyurethane resin obtained by reaction of an isocyanate group-terminated urethane prepolymer with a chain extender, wherein the isocyanate group-terminated urethane prepolymer comprises an adhesive urethane prepolymer for imparting adhesion and a gas-barrier urethane prepolymer for imparting gas barrier properties, the adhesive urethane prepolymer is obtained by reaction of a polyisocyanate component and a polyol component comprising a high-molecular-weight polyol having a number average molecular weight of 400 to 10000, and the gas-barrier urethane prepolymer is obtained by reaction of a polyisocyanate component and a polyol component not comprising the high-molecular-weight polyol but comprising a low-molecular-weight polyol having a number average molecular weight of less than 400 and being selected from an alkane polyol having 2 to 6 carbon atoms and/or a polyoxyalkylene glycol having 2 to 6 carbon atoms, wherein the polyurethane dispersion has a solid content of 5% to 50% by weight.