| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an aqueous polyurethane resin giving a film having both excellent moisture permeability and water resistance, excellent mechanical properties and flexible texture; a hydrophilic resin including the aqueous polyurethane resin (a first aqueous resin) and a second aqueous resin; and a film obtained from the hydrophilic resin. <P>SOLUTION: This aqueous polyurethane resin is obtained by: producing an isocyanate group-terminated prepolymer by reacting a polyisocyanate, containing 50 mass% or more polyisocyanate free of multiple rings (i.e. containing no aromatic ring nor alicyclic ring; or containing either one aromatic ring or one alicyclic ring), polyoxyethylene polyol, and a polyoxyethylene branch-containing active compound having two or more hydroxy and/or isocyanate groups on the molecular terminals and a polyoxyethylene group on the branch; reacting the isocyanate group-terminated prepolymer with a water-containing chain extender to obtain the aqueous polyurethane resin in which 60 mol% or more of the isocyanate group in the isocyanate group-terminated prepolymer is chain-extended with water. <P>COPYRIGHT: (C)2012,JPO&INPIT |
