Provided are a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and including a hydroxyl group formed during the introduction of the acrylic group, an adhesive including the modified polyvinyl alcohol-based resin having excellent adhesion, humidity resistance, and water resistance, an adhesive including a polyvinyl alcohol-based resin, and a compound having an epoxy group, and an acrylic group, a polarizing plate and an image display device including the adhesive. The adhesive for a polarizing plate according to an embodiment of the present invention has excellent adhesion, humidity resistance, and water resistance as well as having excellent solubility with respect to water and an increase in adhesion while physical properties of a typical polyvinyl alcohol-based resin are maintained.
本发明提供了一种改性聚
乙烯醇基
树脂,其中引入了
丙烯酸基团,并包括在引入
丙烯酸基团时形成的羟基;一种包括改性聚
乙烯醇基
树脂的粘合剂,具有优异的粘合性、耐湿性和耐
水性;一种包括聚
乙烯醇基
树脂和具有环氧基团及
丙烯酸基团的化合物的粘合剂;一种偏光板和包括该粘合剂的图像显示装置。根据本发明的一个实施方案,偏光板用粘合剂具有优异的粘合性、防潮性和防
水性,并且对
水具有优异的溶解性,在保持典型聚
乙烯醇基
树脂的物理性质的同时,粘合性也得到了提高。