Patent ID: 7976669

Claim:
A method for manufacturing a pressure-sensitive adhesive and retardation layer-attached polarizing plate ( 4 ), comprising: forming a retardation layer-attached polarizing plate ( 3 ) comprising: a polarizing plate ( 2 ) that comprises an iodine-based polarizer ( 1 ) and a transparent protective film laminated on both sides of the polarizer ( 1 ); and a retardation layer provided on at least one of the transparent protective films, and subjecting the retardation layer-attached polarizing plate ( 3 ) to heat treatment under a tension of 60 N/m to 450 N/m at a heating temperature of 60° C. to 120° C.; and then laminating an acrylic pressure-sensitive adhesive layer on the retardation layer side of the heat-treated retardation layer-attached polarizing plate ( 3 ), wherein the iodine-based polarizer ( 1 ) has a ratio (K/I), which is the content (% by weight) of potassium (K) to the content (% by weight) of iodine ( 1 ) in the polarizer, of 0.200 to 0.235, the polarizing plate ( 2 ) comprises the iodine-based polarizer ( 1 ) and the transparent protective film laminated with an adhesive layer formed from a water-soluble adhesive containing an acetoacetyl group-containing polyvinyl alcohol resin and a crosslinking agent, the retardation layer-attached polarizing plate ( 3 ) has a measured dimensional shrinkage of 0.5% or less in the direction of its absorption axis after it is allowed to stand at 80° C. for 24 hours, where the dimensional shrinkage is defined by the formula: dimensional shrinkage (%)=[{(dimension before standing)−(dimension after standing)}/(dimension before standing)]×100, the pressure-sensitive adhesive and retardation layer-attached polarizing plate ( 4 ) has a single-piece transmittance of 41.0% to 43.2% and, the acrylic pressure-sensitive adhesive layer is formed by a crosslinking reaction of an acrylic pressure-sensitive adhesive comprising a (meth)acrylic polymer (A) and a crosslinking agent, wherein the (meth)acrylic polymer (A) comprises 100 parts by weight of alkyl (meth)acrylate (a1) and 0.01 to 5 parts by weight of a hydroxyl group-containing (meth)acrylic monomer (a2) as copolymerizable components, and the acrylic pressure-sensitive adhesive comprises 0.02 to 2 parts by weight of a peroxide (B) as the crosslinking agent, and 0.001 to 2 parts by weight of an isocyanate compound (C) as the crosslinking agent relative to 100 parts by weight of the (meth)acrylic polymer (A).