Polarization film and its manufacturing method, polarization sheet and optical laminating body

A technology of polarizing film and manufacturing method, which is applied to optics, optical elements, polarizing elements, etc., can solve the problems of color spots on polarizing films and quality degradation of polarizing films, and achieve the purpose of suppressing tension changes, stabilizing operation, and reducing film color spots Effect

Active Publication Date: 2005-03-16
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, even if such ratio control is carried out precisely, color spots will be produced on the prepared polarizing film
Such color spots degrade the quality of polarizing film

Method used

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  • Polarization film and its manufacturing method, polarization sheet and optical laminating body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A polyvinyl alcohol film with a thickness of 75 μm (Kurarevinylon VF-PS#7500, a degree of polymerization of 2400, a degree of saponification of 99.9 mol% or more) was placed in pure water at 30°C, and the film was kept in a tense state so that the film would not sag , Dip for about 130 seconds to fully expand the film.

[0071] Next, the film was uniaxially stretched while being dipped in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / 1.5 / 100 for dyeing treatment. Then, while immersing the film in a 60°C aqueous solution with a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 for boric acid treatment, it was uniaxially stretched until the accumulated stretch ratio was 5.9 times the original. Further, at 40° C., the film was immersed in an aqueous solution with a weight ratio of potassium iodide / boric acid / water of 10 / 3 / 100 for about 30 seconds to perform the second boric acid treatment. After performing the second boric ...

Embodiment 2

[0076] The procedure was carried out in the same manner as in Example 1, except that the second-step boric acid treatment and tension control were performed as described below.

[0077] While immersing the film in a 60°C aqueous solution with a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 for boric acid treatment, it was uniaxially stretched until the cumulative stretching ratio was 5.9 times the original. Further, at 60° C., the film was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 for about 30 seconds to perform a second boric acid treatment.

[0078] In the second boric acid treatment and water washing process, the tension is controlled while detecting each tension.

[0079] The result of obtaining the standard deviation of the orthogonal b' value is as follows: the standard deviation is 0.2, and the obtained polarizer has few color spots.

Embodiment 3

[0081] Except for carrying out the third step of boric acid treatment and tension control as described below, the same operation as in Example 1 must be carried out.

[0082] The film was uniaxially stretched while being immersed in a 55°C aqueous solution with a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100, and further immersed in a film with a weight ratio of potassium iodide / boric acid / water of 10 / 5. / 100 in a 60°C aqueous solution for the second waterproofing treatment while performing uniaxial stretching until the cumulative stretching ratio is 5.9 times the original. Further, at 40° C., the film was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10 / 3 / 100 for about 30 seconds to perform the third boric acid treatment. In the third boric acid treatment and water washing process, the tension is controlled while detecting each tension.

[0083] The result of obtaining the standard deviation of the orthogonal b'...

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Abstract

Provided is a polarizing film free of the unevenness in hue. The polarizing film is obtained by treating a polyvinyl alcohol film in order of swelling, dyeing, boric acid treatment and rinse treatment, subjecting the film to uniaxial stretching in a boric acid treatment step and/or a step before the same and further maintaining the tension acting on the film respectively substantially constant in the respective steps after the stretching treatment, wherein the polyvinyl alcohol film is successively treated in order of the swelling treatment, the dyeing treatment, the boric acid treatment and the rinse treatment, the film is subjected to the uniaxial stretching in the boric acid treatment step and/or the step before the same and further tension control of the film is performed in the respective steps after the stretching treatment, so that the travel of the film is stabilized and the unevenness of the hue can be reduced.

Description

【Technical field】 [0001] The present invention relates to a polarizing film with less color unevenness, a method for producing the same, a polarizer having a protective film laminated on at least one side of the polarizing film, a phase difference film, a brightness improving film, a viewing angle improving film, and a semi-polarizing film. An optical laminate composed of any one of the transflective films alone or bonded together. 【Background technique】 [0002] As a polarizing film, a polyvinyl alcohol-based film in which a dichroic dye is oriented and adsorbed has been conventionally used. 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 generally made into polarizers by bonding protective films such as triacetyl cellulose to at least one side, preferably both sides thereof, with an adhesive composed of an aqueous solution of poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/00B32B27/30G02B1/10G02F1/1335
CPCG02B1/14G02B5/3033G02B5/305
Inventor 山根尚德网谷圭二藤本清二松元浩二
Owner SUMITOMO CHEM CO LTD
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