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

摘要

Disclosed is an aqueous polyurethane resin which forms a stable emulsion, while having good balance between hydrophilicity and hydrophobicity. In addition, a film made from such an aqueous polyurethane resin has a desired moisture permeability and good stability. Also disclosed are a method for producing such an aqueous polyurethane resin and a film obtained from such an aqueous polyurethane resin. Specifically disclosed is an aqueous polyurethane resin containing a plurality of aqueous polyurethane resins, each obtained by reacting a macropolyol, a polyisocyanate and a chain extender. The aqueous polyurethane resins contain different macropolyols from one another, and are chemically bonded to one another partially via the chain extender. A film can be obtained by casting or coating this aqueous polyurethane resin.