Patent ID: 6569533
Filing Date: 2003-05-27
Classification: C08G,C08J,Y10T

Abstract:
An aqueous dispersion comprising a gas barrier polyurethane resin, wherein the polyurethane resin comprises a plurality of urea groups and a plurality of urethane groups, wherein the polyurethane resin has a total concentration of urea groups and urethane groups of 15% by weight or more based upon the total weight of the polyurethane resin, and wherein the polyurethane resin has both of the following characteristics:(1) the oxygen permeability of the polyurethane resin at a thickness of 25 &mgr;m is 50 ml/m2Â·atmÂ·day or less; and (2) the ratio of oxygen permeability of the polyurethane resin at 50%RH to that at 90%RH is 1/1 to 1/2.