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Polarization film and method for producing the same and method for producing polarizer

A manufacturing method and polarizing film technology, which can be applied to polarizing elements, other household appliances, applications, etc., can solve the problems that polarizing films are prone to cracks, and achieve the effect of preventing cracks

Inactive Publication Date: 2009-03-18
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the size of the polarizing plate is increased, cracks are likely to occur on the polarizing film, especially when it is exposed to an environment where thermal shock is applied, that is, when it is exposed to an environment alternating between cold and heat.

Method used

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  • Polarization film and method for producing the same and method for producing polarizer
  • Polarization film and method for producing the same and method for producing polarizer

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0094] A polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm is uniaxially stretched to about 5 times by a dry method, and then directly immersed in pure water at 60°C for 1 minute while maintaining tension Then, it was immersed in the aqueous solution whose mass ratio of iodine / potassium iodide / water was 0.05 / 5 / 100 at 28 degreeC for 60 seconds. Thereafter, it was immersed in an aqueous solution having a mass ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72° C. for 300 seconds. Next, after washing with pure water at 26° C. for 20 seconds, it was dried at 65° C. to obtain a polarizing film in which iodine was adsorbed and oriented on polyvinyl alcohol.

[0095] Separately, 3 parts of carboxy-modified polyvinyl alcohol ("Kurare Poval KL318" manufactured by Kuraray Co., Ltd.), 1.5 parts of water-soluble polyamide epoxy resin ("Kurare Poval KL318" manufactured by Sum...

reference example 2

[0100] A polarizing plate was obtained in the same manner as in Reference Example 1 except having dried in this order in the first-stage drying oven at 65°C and the second-stage drying oven at 75°C. The orthogonal hue of the obtained polarizer is orthogonal a * =0.22, quadrature b * = -0.55, quadrature b * The value of is large on the negative side, and has strong cyan even visually. About this polarizing plate, the thermal shock test similar to the reference example 1 was performed. As a result, in this polarizing plate, no cracks were found on the polarizing plate. Table 1 shows the drying conditions of the laminated film containing X and Y values, the results of the thermal shock test (thermal shock test) and the a of the orthogonal hue * and b * value.

[0101] Next, examples and comparative examples showing the importance of satisfying the above-mentioned formula (1) in the drying oven temperature in the first stage below 60° C. and in the drying oven after the seco...

Embodiment 1

[0103] The polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm is directly immersed in pure water at 30°C to swell while being stretched in the longitudinal direction while being stretched. The magnification is 1.3 times. The polyvinyl alcohol film was dyed with an aqueous solution having a mass ratio of iodine / potassium iodide / water of 0.05 / 2 / 100 at 30°C while maintaining the above stretching ratio, and then dyed with potassium iodide / boric acid / water at 54°C. The aqueous solution with a mass ratio of 12 / 5 / 100 was used for cross-linking treatment, and stretched at the same time to achieve a total ratio of 5.6 times, and then washed with pure water at 12°C. The washed polyvinyl alcohol film was dried at 65° C. to obtain a polarizing film in which iodine was adsorbed and oriented on the polyvinyl alcohol.

[0104] In addition, 1.8 parts of carboxy-modified polyvinyl alcohol ("K...

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Abstract

The invention provides a method of manufacturing a polarizing film, comprising the steps of sticking a polarized light film and a protective film and drying a laminating film through N (N >= 2) drying furnaces, in the drying step, the temperature of a first drying furnace is lower than 60 DEG C, the temperature of at least one drying furnace in the second to N-th drying furnace is higher than 60 degrees, and a laminated film is dried when satisfying the condition that Y > -0.3X+16000, wherein X is the sum of product of the temperature in each drying furnace (DEG C) and residence time (second) of the laminated film in the drying furnace, Y is the sum of the product of the temperature in the drying furnace with the temperature higher than 60 DEG C and the residence time of the laminated film in the drying furnace. Moreover, the invention also provides a polarizing film and a laminating film using the same, wherein the laminating film adsorbs pigments with dichroism orientation, content of boron is 3-3.9 weight percent, when an tension direction axis is a short side and is heated to 80 DEG C in a size of 2 mm*8mm, direction of contraction force orthogonal to the tension direction axis is less than 2.8 N.

Description

technical field [0001] The present invention relates to a polarizing film made of polyvinyl alcohol resin having excellent durability, a method for producing the same, and a method for producing a polarizing plate in which a protective film is laminated on at least one surface of the polarizing film. Background technique [0002] A polarizing plate is usually constructed by laminating a protective film such as cellulose acetate represented by triacetyl cellulose on one or both sides of a polarizing film made of a polyvinyl alcohol-based resin adsorbed and aligned with a dichroic dye using an adhesive. Plain transparent resin film. This is bonded to the liquid crystal cell via other optical films as necessary with an adhesive to form a component of a liquid crystal display device. [0003] As a method of producing a polarizing film, for example, Japanese Patent Application Laid-Open No. 10-153709 (Patent Document 1) describes that a polyvinyl alcohol-based resin film is soak...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08J5/18C08L29/04C08K3/38B29C43/18B29C65/48B29K29/00B29K105/32B29L11/00
Inventor 武藤清幡中伸行难波明生林成年矢可部公彦肥后笃
Owner SUMITOMO CHEM CO LTD
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