Patent ID: 8609764

Claim:
A method of producing a polyvinyl alcohol (PVA) film polarizer having an excellent durability, the method comprising dyeing, cross-linking, stretching, and drying a polyvinyl alcohol film, wherein additives containing phosphorus, which are selected from the group consisting of phosphoric acid, potassium phosphate monobasic, potassium phosphate dibasic, magnesium phosphate dibasic, sodium phosphate monobasic, and ammonium phosphate monobasic, are inputted into one or more of the dyeing, the cross-linking, and the stretching of the polyvinyl alcohol film and are inputted into an aqueous iodide solution or an aqueous potassium iodide solution in the dyeing and/or an aqueous boric acid solution in the cross-linking; and wherein the additives containing phosphorus crosslink with a polymer matrix in the polyvinyl alcohol film to remain in the polarizer.