Water-based adhesive for polarizing element and polarizer obtained with the same
AssigneesNippon Kayaku Kabushiki Kaisha, Polatechno Co., Ltd.
InventorKazuyuki Kawabe
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Abstract
A water-based adhesive for polarizing elements which comprises a polyvinyl alcohol resin, a resin having a maleic anhydride skeleton in the structure, and a crosslinking agent in a weight proportion of 100/(1-1,000)/(0.5-5,000). It is easy to handle because it is of the water-based one-pack type. The adhesive has sufficient adhesion strength even in a high-temperature high-humidity atmosphere. The adhesive contains boron in a high concentration and is effective also in the bonding of polarizing elements, for which conventional adhesives have been insufficient in adhesion strength.
Claims12
A polarizer which comprises a polarizing element and a protective film bonded to the polarizing element with an adhesive, wherein the adhesive is a water-based adhesive for polarizing elements consisting essentially of a polyvinyl alcohol resin, a resin having a maleic anhydride skeleton in the structure, and a crosslinking agent, wherein the resin having a maleic anhydride skeleton in the structure is a copolymer of maleic anhydride and isobutylene.
A method for bonding a protective film to a polarizing element which comprises bonding the protective film to the polarizing element by use of a water-based adhesive consisting essentially of a polyvinyl alcohol resin, a resin having a maleic anhydride skeleton in the structure, and a crosslinking agent, wherein the resin having a maleic anhydride skeleton in the structure is a copolymer of maleic anhydride and isobutylene.
Dependencies are inferred from the claim text.