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Polarizer and manufacturing method thereof

A technology of polarizers and polarizing films, which is applied in polarizing elements, chemical instruments and methods, instruments, etc., can solve problems such as air bubble mixing, and achieve the effect of reducing curling

Active Publication Date: 2007-09-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the side of the cycloolefin-based protective film tends to have a large curl that becomes a concave portion, and at this time, there is a problem of air bubbles being mixed in when laminating to the liquid crystal cell.

Method used

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  • Polarizer and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0069] [Manufacturing example 1] Production of polarizing film

[0070] 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 5 times by a dry method, and then placed in pure water at 60°C while maintaining the stretched state. Immersed in water for 1 minute, and then immersed in an aqueous solution with a weight ratio of iodine / potassium iodide / water of 0.05 / 5 / 100 at 28° C. for 60 seconds. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72° C. for 300 seconds. Next, it was washed with pure water at 26° C. for 20 seconds, and then dried at 65° C. to obtain an aligned polarizing film in which iodine was adsorbed to a polyvinyl alcohol resin.

manufacture example 2

[0071] [Manufacturing example 2] Preparation of adhesive

[0072] Add 3 parts of carboxy-modified polyvinyl alcohol ("Kurarepoba-ru KL318" obtained from Kuraray Co., Ltd.) and water-soluble polyamide epoxy resin ("Sumire-zuresin 650" obtained from Sumika Chemtex Co., Ltd.) to 100 parts of water. " (Aqueous solution with a solid content concentration of 30%) 1.5 parts to make a polyvinyl alcohol-based adhesive.

reference example 1

[0073] [Reference Example 1] Pretreatment of triacetyl cellulose film

[0074] A triacetyl cellulose film with a thickness of 80 μm [obtained from "KC8UX2MW" manufactured by Konika Minolta Opto Co., Ltd.] was subjected to saponification treatment, then immersed in water at the temperature indicated in the water temperature item of Table 1 for 10 seconds to perform swelling treatment, and then , were similarly dried for 53 seconds at the temperatures shown in the drying temperature item of Table 1, and then provided to the lamination of the following Comparative Examples 1-2 and Examples 1-3.

[0075] The water content in this state was obtained by the following weight loss method. That is, a small piece of 100mm x 100mm was cut from the same film, immersed in water and dried under the same conditions as above, and then measured for weight, and then the sample was kept in an oven at 100°C for 1 hour, and then the weight was measured. Calculate the moisture content from the dif...

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Abstract

A polarizing plate is prepared by laminating cycloolefin resin films by adhesives on one side of the polarizing film made of polyvinyl alcohol resin and laminating cellulose acetate films by adhesives on the other side, and the water fraction of the cellulose acetate films before lamination is adjusted over 0.5%. Adjustment of the water fraction can be carried out by soaking the cellulose acetate films in water and then drying. According to the invention, crimp is inhibited in the polarizing plate prepared by laminating cycloolefin resin films by adhesives on one side of the polarizing film made of polyvinyl alcohol resin and laminating cellulose acetate films by adhesives on the other side.

Description

technical field [0001] The present invention relates to a polarizing plate in which a polarizing film composed of a polyvinyl alcohol-based resin is laminated with a cycloolefin-based resin film on one side via an adhesive, and a polarizing film is laminated on the other side via a Adhesive laminated cellulose acetate film. More specifically, it relates to a polarizing plate that suppresses curling even when such a polarizing film is sandwiched to form an asymmetric structure, and hardly causes air bubbles to entrain when it is bonded to a liquid crystal cell, and a method for manufacturing the same. Background technique [0002] Generally, a polarizing plate has a structure in which a transparent resin film, such as cellulose triacetate, is laminated on both sides of a polarizing film made of a polyvinyl alcohol-based resin that absorbs and aligns a dichroic dye, via an adhesive. Made of cellulose acetate-based protective film. In addition, by laminating a stretched optic...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCB32B27/08C08J5/18C08J2301/12C08J2323/08C08J2329/04C08L1/12C08L23/0823C08L29/04C08L2203/16G02B5/3033
Inventor 幡中伸行武藤清林成年
Owner SUMITOMO CHEM CO LTD
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