Title:
偏光フィルムの製造方法、偏光板の製造方法および光学積層体の製造方法
Document Type and Number:
Japanese Patent JP4323280
Kind Code:
B2
Abstract:
A method of producing a polarizing film, a method of producing a polarizer, and a method of producing an optical laminate are provided to reduce color spots by forming uniformly a state of a film before a dyeing treatment. A method for producing a polarizing film includes a swelling treatment, a dyeing treatment, and a boric acid treatment for a polyvinyl alcohol-based film which are sequentially performed within a chamber. The polarizing film is obtained by drawing the polyvinyl alcohol-based film from one of the swelling treatment, the dyeing treatment, and the boric acid treatment for the polyvinyl alcohol-based film. One or more wet-drawing processes are performed before the dyeing treatment after the swelling treatment. The wet-drawing processes are performed in a drawing rate of 1.1 to 3 times within an aqueous solution including boric acid of 0.01 to 2.0 weight percent in water of 100 weight percent.
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Inventors:
Koji Matsumoto
Keiji Amitani
Naonori Yamane
Seiji Fujimoto
Keiji Amitani
Naonori Yamane
Seiji Fujimoto
Application Number:
JP2003348465A
Publication Date:
September 02, 2009
Filing Date:
October 07, 2003
Export Citation:
Assignee:
Sumitomo Chemical Co., Ltd.
International Classes:
G02B5/30; B29C55/04; C08J5/18; B29K29/00; B29L11/00
Domestic Patent References:
| JP4204907A | ||||
| JP10153709A | ||||
| JP2001141926A | ||||
| JP6265727A |
Attorney, Agent or Firm:
Toshikazu Fukai
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