US Patent 6846524 Inkjet recording medium

An inkjet recording medium comprising at least one ink receiving layer on a support, wherein the ink receiving layer which is the outermost layer comprises a pigment and an aqueous polyurethane resin as principal components, the proportion of said aqueous polyurethane resin relative to said pigment in the ink receiving layer which is the outermost layer is 5-80 wt %, said aqueous polyurethane resin is formed by reaction of an active hydrogen compound and an aliphatic and/or alicyclic polyisocyanate compound, said active hydrogen compound contains 40-80 wt % of a polyether polyol compound having a number average molecular weight of 500-3000, and the minimum film-forming temperature of said aqueous polyurethane resin is −10-50 degree C.