Polarizer protection film, polarizing plate and image display

A technology for polarizers and protective films, applied in polarizing elements, optics, instruments, etc., can solve the problems of lowering heat resistance, polarization degree or color tone polarizing plate performance, resin coloring and yellowing, etc., to achieve excellent ultraviolet absorption capacity, Effect of coloring and less foaming, excellent optical clarity

Inactive Publication Date: 2009-09-09
NIPPON SHOKUBAI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, triacetyl cellulose has the following disadvantages: its resistance to heat and humidity is insufficient, and when a polarizing plate using a triacetyl cellulose film as a polarizer protective film is used in a high-temperature or high-humidity environment, the degree of polarization or color tone of the polarizing plate cannot be adjusted. performance will be reduced
However, this kind of polarizer protective film has the following problems: Compared with the Tg (glass transition temperature) of the material resin before the addition of the ultraviolet absorber, the Tg after the addition of the ultraviolet absorber is significantly lower (the problem of lower heat resistance); And resin coloring (yellowing)

Method used

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  • Polarizer protection film, polarizing plate and image display
  • Polarizer protection film, polarizing plate and image display
  • Polarizer protection film, polarizing plate and image display

Examples

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Embodiment

[0165]Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. In addition, unless otherwise specified, the percentage in an Example and a comparative example is a basis of weight. Evaluation is performed in the following manner.

[0166]

[0167] The weight-average molecular weight of the polymer was determined in terms of polystyrene by GPC (gel permeation chromatography) (GPC system manufactured by Tosoh Co., Ltd.). Chloroform was used as a developing solution.

[0168]

[0169] The thermal analysis of the resin was carried out using a DSC (differential scanning calorimeter) (manufactured by Rigaku Co., Ltd., device name: DSC-8230). In addition, glass transition temperature (Tg) was calculated|required by the midpoint method based on ASTM-D-3418.

[0170]

[0171] First, based on the weight loss that occurs when all the hydroxyl groups are dealcoholated in the form of methanol from the polymer compos...

reference example 1

[0202] [Reference Example 1]: Manufacture of polarizing plate

[0203] A polyvinyl alcohol film having a thickness of 80 μm was dyed in a 5% by weight (weight ratio: iodine / potassium iodide=1 / 10) iodine aqueous solution. Next, the polyvinyl alcohol film was immersed in an aqueous solution containing 3% by weight of boric acid and 2% by weight of potassium iodide, and further stretched to 5.5 times in an aqueous solution containing 4% by weight of boric acid and 3% by weight of potassium iodide. , dipped in a 5% by weight potassium iodide aqueous solution. Thereafter, it was dried in an oven at 40° C. for 3 minutes to obtain a polarizing plate with a thickness of 30 μm.

reference example 2

[0204] [Reference Example 2]: Production of acrylic resin containing a lactone ring (Using UV-absorbing monomer)

[0205] In a 30L reaction kettle equipped with a stirring device, a temperature sensor, a condenser tube, and a nitrogen introduction tube, 7000g of methyl methacrylate (MMA), 1000g of 2-[2'-hydroxyl-5'-(methacryloyl Oxyethyl) phenyl] benzotriazole, 2000g of 2-(hydroxymethyl) methyl acrylate (MHMA), 10000g of toluene, nitrogen gas was introduced therein, and the temperature was raised to 105°C, and reflux was carried out, and then Add 10.0 g of tert-amyl peroxyisononanoate (manufactured by Arkema Yoshitomi, trade name: Lupasol 570) as an initiator, and at the same time, dropwise add a solution containing 20.0 g of the initiator and 100 g of toluene for 4 hours, while refluxing Solution polymerization was carried out at low temperature (about 105-110° C.), followed by aging for 4 hours.

[0206] Add 10 g of octadecyl phosphate / dioctadecyl phosphate mixture (manufac...

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Abstract

The invention provides a polarizer protection film which exhibits excellent ultraviolet absorption by using an ultraviolet-absorbing monomer as the raw material. The polarizer protection film also exhibits excellent heat resistance, excellent optical transparency, while having extremely little coloration and foaming. The invention also provides a polarizing plate with only a few appearance defects, which uses such a polarizer protection film, and a high-quality image display using such a polarizing plate. The polarizer protection film has a light transmittance of 380 nm of not more than 30% with a thickness of 80 [mu]m, and can be obtained by extrusion molding using a molding material containing a resin component mainly composed of a (meth)acrylic resin which is obtained by polymerizing a monomer composition containing an ultraviolet-absorbing monomer and a (meth)acrylic monomer.

Description

technical field [0001] The present invention relates to a polarizing plate protective film, a polarizing plate using the polarizing plate, and an image display device such as a liquid crystal display device, an organic EL display device, and a PDP including at least one of the polarizing plate. Background technique [0002] In liquid crystal display devices, the image forming method requires that polarizing plates must be arranged on both sides of the glass substrate forming the surface of the liquid crystal panel. The polarizing plate is generally used a polarizing plate formed by bonding a polarizing plate protective film to both sides of a polarizing plate made of a polyvinyl alcohol-based film and a dichroic material such as iodine using a polyvinyl alcohol-based adhesive. polarizing plate. [0003] In order to prevent liquid crystals or polarizers from deteriorating due to ultraviolet rays, polarizer protective films must have ultraviolet absorbing properties. As a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528G02B5/305G02F2201/50G02F2201/086G02B5/30G02F1/1335
Inventor 和泉博子中田善知上田贤一服部大辅小岛理鹰尾宽行羽仁勉
Owner NIPPON SHOKUBAI CO LTD
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