Manufacturing method of polarized light film, polarized light slice and optical laminate style

A technology of polarizing film and manufacturing method, which is applied in the direction of polarizing elements, textiles, papermaking, fabrics, etc., which can solve the problems of film breakage, many stripes, and not necessarily good appearance, and achieve the effect of less breakage and high grade

Active Publication Date: 2006-07-12
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the past, the drying treatment of the film was performed in one stage (for example, refer to Patent Document 1 and Patent Document 2), and at this time, wrinkles or film breakage occurred on the film
In addition, when the obtained polarizing film is observed under the reflection of a fluorescent lamp, many stripes may be seen, and the appearance may not be good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A polyvinyl alcohol film with a thickness of 75 μm (Kurarevinylon VF-PS#7500, a degree of polymerization of 2400, and a degree of saponification of 99.9 mol% or more) was immersed in pure water at 30°C for approximately 130°C while keeping the film in a tense state without loosening. seconds to fully swell the membrane.

[0077] Next, uniaxial stretching was carried out while immersing in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / 1.5 / 100. Then, while immersing in a 60° C. aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 for water resistance treatment, uniaxial stretching was carried out until the cumulative stretching ratio from the roll reached 5.9 times. Then, at 30°C, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 20 / 3 / 100 for about 30 seconds, and then washed with pure water at 10°C for about 10 seconds.

[0078] Next, while impartin...

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PUM

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Abstract

To provide a method for manufacturing a polarizing film less liable to crease or break and having good appearance because of few streaks. In the method for manufacturing the polarizing film by sequentially subjecting a polyvinyl alcohol-based film to swelling, dyeing, boric acid treatment, washing and drying, the drying is carried out in multiple steps while applying tension to the film, the tension is controlled so that tension per unit width of the film in each step of the drying is made substantially constant, tension in the succeeding step is made lower than that in the preceding step, and a drying temperature in the succeeding step is made higher than that in the preceding step.

Description

technical field [0001] The present invention relates to a method for producing a polarizing film with less wrinkles, less film breakage, less streaks and good appearance, and a polarizing plate in which a protective film is laminated on at least one side of the obtained polarizing film. It also relates to an optical laminate obtained by bonding any single or multiple of a retardation film, a brightness improvement film, a viewing angle improvement film, and a transflective film. Background technique [0002] As a polarizing film, a film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based film has conventionally been 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 usually bonded with a protective film such as triacetyl cellulose to at least one surface, preferably both surfaces thereof, with an adhesiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCA47K10/02D03D27/00
Inventor 网谷圭二松元浩二
Owner SUMITOMO CHEM CO LTD
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