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Polarization plate and optical component

A technology of polarizing plates and polarizers, which is applied in the field of polarizing plates, can solve problems such as insufficient durability and shrinkage easily caused by heat resistance tests of polarizing plates, and achieve good adhesion, superior lightness of thin sheets, and high durability Effect

Inactive Publication Date: 2009-01-14
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The protective film formed by such coating can be thinned compared with the conventional case where triacetyl cellulose film is laminated, but the polarizing plate produced by the method described in these documents has difficulty in heat resistance test. Shrinkage is caused, and the durability performance may not be sufficient

Method used

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  • Polarization plate and optical component
  • Polarization plate and optical component
  • Polarization plate and optical component

Examples

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Effect test

reference example 1

[0094] [Reference example 1] Production of polarizing plate

[0095] A polyvinyl alcohol film with an average degree of polymerization of about 2400, a saponification degree of 99.9 mol% or more, and a thickness of 75 μm is uniaxially stretched to 5 times in a dry type, and then immersed in pure water at 60°C for 1 Minutes, 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. Then, it was immersed at 72 degreeC for 300 second in the aqueous solution whose weight ratio of potassium iodide / boric acid / water was 8.5 / 8.5 / 100. Next, after washing in 26 degreeC pure water for 20 seconds, it dried at 65 degreeC, and produced the polarizing plate which adsorb|sucked and oriented the iodine on the polyvinyl alcohol.

Embodiment 1

[0097] One side of the polarizing plate obtained in Reference Example 1 was coated with the above-mentioned ultraviolet curable resin composition "DN-0081" using a coater, and cured by irradiating ultraviolet rays. The same composition was also applied to the other side of the polarizer, and cured by irradiating ultraviolet rays. In this way, a polarizing plate in which protective films were formed on both surfaces of the polarizing plate was produced. The thickness of the protective film was 10.5 μm on both sides. In addition, the same composition was applied on another substrate and cured, and the tensile elastic modulus of the evaluated protective film was 6845 N / mm 2 (=MPa). Thereby, the tensile elastic modulus (N / mm 2 ) and thickness (mm) on one side is 72N / mm.

Embodiment 2

[0099] A polarizing plate was produced in the same manner as in Example 1 except that the thickness of the protective film was 8 μm on both sides. Tensile elastic modulus of protective film (N / mm 2 ) and thickness (mm) on one side is 55N / mm.

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Abstract

The invention provides an optical component capable of satisfying the polarizing plate having light weight thin slice and excellent durability and supplying excellent reliability and forming liquid crystal display device for mobile use or large television use and so on, A protective with thickness less than 20 microns is on at least one side of the polarizing sheet composed by polyvinyl alcohol resin; the protective film is formed that the product of the tensile modulus of elasticity (unit:N / mm2) and thickness (unit: mm) is over than 40N / mm. the protective film is able to be formed by coating the surface of the polarizing sheet; the invention has the advantages of: the coating is formed by curing the coating composition of inorganic filler cooperating in the UV curing resin. The invention further provides the optical component overlapped on the polarizing plate for displaying the optical layer having other optical functions.

Description

technical field [0001] The present invention relates to a polarizing plate (Polarizer) which is formed in a thin sheet, is excellent in lightness, and is suitable for use in mobile liquid crystal display devices, large liquid crystal televisions, and the like. The present invention also relates to an optical component using the polarizing plate. Background technique [0002] A polarizing plate is widely used as a polarized light supply element in a liquid crystal display device and also as a polarized light detection element. As the polarizing plate, conventionally, a polarizing plate in which a protective film made of triacetyl cellulose is adhered to a polarizing plate made of polyvinyl alcohol has been used. Applications to mobile devices such as telephones, and applications to large TVs, etc., are seeking to reduce the weight of sheets. In addition, the usage places are shifted to a wide range due to portability, and at the same time, improvement in durability is requi...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/10G02B1/04G02F1/1335
CPCB29C55/04C08J5/18C08L29/04G02B5/3041G02F1/133528
Inventor 武藤清
Owner SUMITOMO CHEM CO LTD
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