Polyvinyl alcohol polymer film and polarization film
AssigneeKuraray Co., Ltd.
InventorsShigeyuki Harita, Takanori Isozaki, Naoki Fujiwara
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Abstract
A polyvinyl alcohol polymer film includes a polyvinyl alcohol polymer and a plasticizer selected from the group consisting of ethylene glycol, glycerin, propylene glycol, diethylene glycol, diglycerin, triethylene glycol, tetraethylene glycol, and trimethylolpropane. The amount of the polyvinyl alcohol polymer eluted when a 10 cm square of the polyvinyl alcohol polymer film is left in 1 liter of water of 50° C. for 4 hours is from 1 to 100 ppm. The film has only a small number of defects and is useful as raw material for producing a polarization film.
Claims13
1-11. (canceled)
A polyvinyl alcohol polymer polarization film made by using a polyvinyl alcohol polymer film 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 a 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 is left in 1 liter of water at 50° C. for 4 hours is from 1 to 100 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.
A method of producing a polyvinyl alcohol polymer polarization film comprising:
- (1) producing a polyvinyl alcohol polymer film by steps comprising:
- (a) washing a raw material 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 a 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 is left in 1 liter of water at 50° C. for 4 hours is from 1 to 100 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;
- and
- (2) dyeing, stretching and fixing the polyvinyl alcohol polymer film.
A method of producing a polyvinyl alcohol polymer film for a polarization film comprising:
- (a) washing a raw material 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 a 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 is left in 1 liter of water at 50° C. for 4 hours is from 1 to 100 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.
Dependencies are inferred from the claim text.