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Manufacturing method of polarizing plate

A manufacturing method and technology for polarizing plates, which are applied in polarizing elements, chemical instruments and methods, adhesive types, etc., can solve the problems of liquid crystal cells not being reused, excessive erosion of cycloolefin resin films, etc., and improve the adhesive force. , corrosion inhibition, high performance effect

Active Publication Date: 2016-05-18
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after the polarizing plate is placed on the liquid crystal cell, it may be necessary to remove the polarizing plate again due to defects or the like (referred to as rework). Compared with the adhesive force of the polarizing plate, the adhesive force in the laminated structure of the polarizing plate (for example, the adhesive force between the polarizing film and the cycloolefin resin film) is relatively small, and sometimes there is a Only the cycloolefin-based resin remains on the surface, and the liquid crystal cell becomes unusable
[0007] According to the method disclosed in the aforementioned KR2010-92265-A, although the adhesive force of the cycloolefin-based resin film to the polyvinyl alcohol-based polarizing film can be improved, when the surface is treated with an aqueous solution, it is necessary to maintain the temperature at which the water evaporates. drying oven
On the other hand, among the organic compounds specifically disclosed in the literature, if a substance (organic solvent) that is liquid at normal temperature is directly applied to the cycloolefin-based resin film, the cycloolefin-based resin film may be excessively eroded.

Method used

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  • Manufacturing method of polarizing plate
  • Manufacturing method of polarizing plate
  • Manufacturing method of polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0209] [Manufacturing example 1] Production of polarizing film

[0210] After immersing 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 in pure water at 30°C, in an aqueous solution with a weight ratio of iodine / potassium iodide / water of 0.02 / 2 / 100 Dip dyeing was performed at 30°C. Then, it immersed in the aqueous solution whose weight ratio of potassium iodide / boric acid / water was 12 / 5 / 100 at 56.5 degreeC, and performed boric-acid treatment. Next, after washing|cleaning with the pure water of 8 degreeC, it dried at 65 degreeC, and obtained the polarizing film of the thickness of about 30 micrometers in which iodine was adsorbed and oriented in polyvinyl alcohol. Stretching is mainly carried out in the process of iodine dyeing and boric acid treatment, and the total stretching ratio is 5.3 times.

manufacture example 2

[0211] [Manufacturing Example 2] Preparation of Adhesive Composition

[0212] Acetoacetyl-modified polyvinyl alcohol [trade name "Gohsefimer Z-200", manufactured by Nippon Synthetic Chemical Industry Co., Ltd., viscosity of 4% aqueous solution = 12.4 mPa·sec, degree of saponification = 99.1 mol %] was dissolved in pure water to prepare 10 % concentration in aqueous solution. The aqueous solution of acetoacetyl-modified polyvinyl alcohol and sodium glyoxylate used as a crosslinking agent were mixed in such a manner that the former:the solid content weight ratio of the latter was 1:0.1, and acetyl The acetyl-modified polyvinyl alcohol was diluted with pure water so as to have 2.5 parts, and an adhesive composition was prepared.

Embodiment 1

[0221] In the above comparative example, one side of the stretched cycloolefin-based resin film used as one protective film was coated with toluene: methyl ethyl ketone = 1 using a coater [Daiichi Rika Co., Ltd. : 9 (volume ratio) mixed organic solvent. This coating is carried out while blowing air to the coated surface with a blower. Table 2 shows the results of measuring the haze value of the cycloolefin-based resin film after the treatment by the method shown in (A) of the comparative example.

[0222] Moreover, although the result of visual observation of the surface unevenness of the cycloolefin-type resin film after a solvent process was hard to see, the state of unevenness can be confirmed by careful observation. Similarly, the in-plane retardation value was measured for the cycloolefin-based resin film after the solvent treatment, and the value (90 nm) changed from the value (90 nm) before the treatment was obtained. -0.3nm. In the following examples and comparative...

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Abstract

Poval family resin is provided with attached dichroism pigment and the polarizing membrane thereon is a protective membrane composed of cycloolefin family resin with the help of bonding agent. During the production of the polarizing membrane, after the above mentioned protective membrane is contacted with a mixed organic solvent without solute in a manner with no more than 0.5% turbidity value, the protective membrane is attached to the polarizing membrane. The mixed organic solvent is the mixed solvent of the following solvents: the organic solvent(good solvent),whereby the resin is changed because of the contact, and the organic solvent (bad solvent), whereby the resin is substantially changed not because of the contact. The mixed organic solvent can be replaced by the individually used alicyclic hydrocarbon, but the bad solvent, which is mixed with the alicyclic hydrocarbon, is useful.

Description

technical field [0001] The present invention relates to a method for manufacturing a polarizing plate by bonding a protective film made of a cycloolefin-based resin on the surface of a polarizing film made of a polyvinyl alcohol-based resin via an adhesive. Background technique [0002] A polarizing plate is usually formed by laminating a transparent resin film with an adhesive (Japanese: Adhesive) on one or both sides of a polarizing film made of a polyvinyl alcohol-based resin that absorbs a dichroic dye and aligns it, for example, with Triacetyl cellulose is a representative cellulose acetate-based film. This is bonded to a liquid crystal cell with an adhesive through other optical films such as an optical compensation film and a retardation film as needed, and becomes a component of a liquid crystal display device. [0003] The use of liquid crystal display devices as thin display screens such as liquid crystal televisions, liquid crystal monitors, and personal computer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02B1/14B32B27/08B32B27/30B32B27/32C09J129/00C09J11/00
CPCC09J129/00G02B5/305B29C35/02B29D11/00644B32B7/02B32B27/08B32B27/32C09J129/04G02B1/14G02B5/3041
Inventor 藤长将司藤田政大
Owner SUMITOMO CHEM CO LTD
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