Patent ID: 7511093
Filing Date: 2009-03-31
Classification: C08J,C08K,G02B,Y10S

Abstract:
1. A polyvinyl alcohol polymer polarization film made by a process including dyeing with a dye, stretching and fixing a polyvinyl alcohol polymer film, wherein the polyvinyl alcohol polymer film is produced by a method comprising: (a) washing a polyvinyl alcohol polymer, (b) preparing a polyvinyl alcohol polymer solution or a water-containing polyvinyl alcohol polymer from the washed polyvinyl alcohol polymer, and (c) forming the polyvinyl alcohol polymer film from the polyvinyl alcohol polymer solution or the water-containing polyvinyl alcohol polymer, wherein an amount of the polyvinyl alcohol polymer eluted when a 10 cm square of the polyvinyl alcohol polymer film having a thickness of 30 to 90 μm is left in 1 liter of water at 50° C. for 4 hours is from 1 to 60 ppm, and a content of an alkali metal compound in the polyvinyl alcohol polymer film is 0.5% by weight or less based on the polyvinyl alcohol polymer.