Iodine polarizing film manufacturing method, polaroid manufacturing method and optical laminate manufacturing method

A polarizing film and polarizing plate technology, applied in optics, optical components, polarizing components, etc., can solve the problems of easy occurrence of wrinkles and poor initial optical properties, and achieve the effects of not easy to relax, easy protection and management, and improved durability.

Active Publication Date: 2008-11-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 1, dyeing is performed twice after the boric acid treatment. In this case, not only wrinkles are likely to occur, but also the initial optical properties are poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Put a polyvinyl alcohol film (Kuraray Co.BINIRON (クラレビニロン) VF-PS#7500, degree of polymerization 2400, degree of saponification 99.9 mol% or more) with a thickness of 75 μm in pure water at 30°C, and keep the film under tension so that the film does not loosen Immerse for about 130 seconds in the state to make the membrane fully swell.

[0069] Next, uniaxially stretched to 2.50 times while dipping in a 30° C. aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / 1.0 / 100. Further, it was dipped in an aqueous solution at 30° C. at a weight ratio of iodine / potassium iodide / water of 0.025 / 1.5 / 100, while being uniaxially stretched to 1.04 times. Thereafter, it was dipped in a 60° C. aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 to perform boric acid treatment while uniaxially stretching until the cumulative stretching ratio from the rough film reached 5.9 times. After the boric acid treatment, it was washed...

Embodiment 2

[0074] Immerse a polyvinyl alcohol film (Kuraray Co.BINIRONVF-PS#7500, degree of polymerization 2400, degree of saponification 99.9 mol% or more) with a thickness of 75 μm in pure water at 30°C for about 130 seconds to fully swell the membrane.

[0075] Next, uniaxially stretched to 1.04 times while dipping in a 30° C. aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / 1.0 / 100. Further, it was dipped in a 30° C. aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.025 / 1.5 / 100, while performing uniaxial stretching to 2.50 times. Thereafter, it was dipped in a 60° C. aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 to perform boric acid treatment while uniaxially stretching until the cumulative stretching ratio from the rough film reached 5.9 times. After the boric acid treatment, it was washed in pure water at 10°C for about 10 seconds. After washing with water, it was dried at 60° C. ...

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Abstract

The invention is aimed to provide a manufacturing method of polarizing film which hardly causes dyeing irregularity and permits the reduction of frequency of wrinkle generation and the reduction of tension during processes after dyeing, and to provide a polarizing plate and an optical laminate using the polarizing film. In the manufacturing method of polarizing film, uniaxial stretching is performed before and / or during a process of treating a polyvinyl alcohol base film in order of swelling, iodine dyeing and borating. Prior to the borating process, the iodine dyeing is performed in dyeing baths of two steps or more and, further, uniaxial stretching is performed in dyeing baths of two steps or more. Therein, the uniaxial stretching is performed in such a manner that (1) the stretching ratio in the initial dyeing bath is set to be higher than the sum stretching ratio in dyeing baths on and after the second step or (2) the stretching ratio in the last dyeing bath is set to be higher than the sum stretching ratio in the dyeing baths prior to the last dyeing bath.

Description

technical field [0001] The present invention relates to a method for producing an iodine-based polarizing film with less dyeing unevenness and reduced frequency of wrinkling or improved productivity, a method for producing a polarizing plate in which a protective film is laminated on at least one side of the obtained polarizing film, and a phase A manufacturing method of an optical laminate formed by sticking one or more of a differential film, a brightness improving film, a viewing angle improving film and a transflective film. Background technique [0002] Conventionally, as a polarizing film, a dichroic dye is adsorbed and oriented to a polyvinyl alcohol-based film. That is, an iodine-based polarizing film using iodine as a dichroic dye, a dye-based polarizing film using a dichroic dye as a dichroic dye, and the like are known. These polarizing films are usually made into polarizers by affixing a protective film such as triacetyl cellulose to at least one side, preferabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B7/00B29C55/04B29K29/00
CPCB29C55/04B32B7/12B32B2307/42G02B5/3041
Inventor 网谷圭二藤本清二松元浩二山根尚德
Owner SUMITOMO CHEM CO LTD
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