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Optical film comprising primer layer containing polyester resin and polarizing plate using same

一种聚酯树脂、光学膜的技术，应用在偏光板领域，能够解决低折射率、损坏、降低偏光板性能等问题

Active Publication Date: 2016-07-13
ANHUI HEMEI MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a related field, a triacetyl cellulose (TAC)-based film is generally used as a protective film for a polarizing plate, but there is a problem that the TAC film is easily deformed in a high-temperature and high-humidity environment
However, there are cases where the adhesive force with the functional coating layer is insufficient depending on the kind of the protective film, and in this case, there is a problem that the functional coating layer is peeled off from the protective film or is damaged to lower the performance of the polarizing plate.
[0004] In order to solve the above-mentioned problems, a method of surface treatment on the surface of the protective film, such as plasma treatment and corona treatment, or a primer layer formed, has been proposed, but up to now, the above-mentioned methods cannot fully ensure the Adhesion between said protective film, especially acrylic-based protective film, and said functional coating
For example, in the related art, in the case of a proposed urethane-based resin as a primer layer of a protective film, there is a problem that, due to low water resistance and solvent resistance, moisture is lost during long-term storage under high humidity. In the case of coating a coating composition containing an organic solvent on the primer layer, the primer layer is dissolved due to the organic solvent contained in the coating composition to cause a decrease in adhesion Membrane separation
Also, there is the problem that in the case of using silica with different dimensions or using layers with a low refractive index, the coating is transparent and therefore the refractive index between the primer layer and the acrylic film In the case of a large difference, a rainbow phenomenon occurs due to the interference of light

Method used

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  • Optical film comprising primer layer containing polyester resin and polarizing plate using same
  • Optical film comprising primer layer containing polyester resin and polarizing plate using same
  • Optical film comprising primer layer containing polyester resin and polarizing plate using same

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0110] Preparation Example 1 - Preparation of a composition for forming a functional coating

[0111] 18 g of pentaerythritol triacrylate and 18 g of dipentaerythritol pentaacrylate as binder resin; 250 g of hollow silica particle dispersion solution (produced by Catalystand Chemicals Co., Ltd., hollow silica particles with a number average particle size of 50-60 nm in 20 wt % 10g of polyether siloxane polymer (produced by EVONIKInd., trade name: TEGOGlide450) particles; and 4g of light A polymerization initiator (manufactured by CIBA Specialty Chemicals, trade name: Irgacure 184) was mixed and stirred for 30 minutes. Here, it was diluted with methyl isobutyl ketone (MIBK) so that the solid content was 3 wt%, to prepare a low reflection coating composition.

preparation Embodiment 2

[0112] The preparation of preparation example 2-polyester resin

[0113] (1) Synthesis Example of Polyester Resin A

[0114] The 500 ml round bottom flask was replaced with nitrogen, and ethylene glycol (EG), diethylene glycol (DEG), m-benzene Sodium sulfonate dicarboxylate (SSIPA), isophthalic acid (IPA) and cyclohexanedicarboxylic acid (CHDA), were esterified at 200°C for 2 hours to remove the theoretical amount of water. Add tetramethyl titanate, antimony acetate, and dibutyltin oxide as a catalyst, and trimethyl phosphate as a stabilizer to continuously remove water, and then carry out polycondensation at 255°C under a reduced pressure of 2.5 torr or less React for 150 minutes to prepare polyester resin A.

[0115] (2) Synthesis Example of Polyester Resin B

[0116] The 500 ml round bottom flask was replaced with nitrogen, and ethylene glycol (EG), diethylene glycol (DEG), m-benzene Sodium sulfonate dicarboxylate (SSIPA), isophthalic acid (IPA) and adipic acid (AA), we...

Embodiment 1

[0126] After mixing 40 parts by weight of polyester resin A produced as described above, 3 parts by weight of silica, and 57 parts by weight of water to produce a primer composition, the primer composition was coated onto an electric wire by #7 bar. on one surface of a halo-treated acrylic-based film, and the film was uniaxially stretched in the MD direction at 135°C, and then uniaxially stretched in the TD direction to produce a film in which the primer layer was formed with a thickness of 600 nm. Acrylic based film. The surface of the membrane is at 50W / m 2 / min under the conditions of corona treatment.

[0127] The composition for forming a functional coating produced by Preparation Example 1 was applied to the surface of the prepared primer layer-coated film by using a bar coating method so that the thickness after drying was 4 μm, and then irradiated at 280 mJ / cm 2 UV to carry out curing, and thus obtain a film formed with a functional coating.

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Abstract

The present invention relates to an optical film comprising: a base film; and a primer layer formed on at least one surface of the base film and containing a polyester resin and water-dispersive microparticles, the difference in the refractive index between the base film and the polymer layer being 0.03 or smaller, wherein the polyester resin contains polyester glycol formed by a reaction of polybasic acid and polyol, the polybasic acid containing an aromatic carboxylic acid compound and an aliphatic carboxylic acid compound at a mole ratio of 1:9 to 9:1. Superior adhesive strength and a small refractive index difference between the optical film and a functional coating layer lead to a reduction in the rainbow phenomenon, and excellent optical properties.

Description

technical field [0001] The present invention relates to an optical film and a polarizing plate including the same, and more particularly, the present invention relates to an optical film including a primer layer containing a polyester resin and a polarizing plate including the optical film, in which the optical film , the difference in refractive index between the base material film and the primer layer is 0.03 or less. Background technique [0002] A polarizing plate is generally used in a structure in which a protective film is laminated on one surface of a polarizing plate formed of a polyvinyl alcohol (hereinafter referred to as “PVA”)-based resin dyed with a dichroic dye or iodine by using an adhesive. or both surfaces. In the related art, a triacetyl cellulose (TAC)-based film is generally used as a protective film for a polarizing plate, but there is a problem that the TAC film is easily deformed in a high temperature and high humidity environment. Therefore, protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/36C08J7/043C08J7/046
CPCB32B27/08B32B27/308B32B27/36G02B5/3016B32B2307/418B32B2307/42B32B2551/00G02B1/111C08J2333/02B32B27/16B32B27/18B32B2255/10B32B2255/26B32B2264/00B32B2264/12B32B2307/516B32B2307/732G02B1/14C08J2467/02G02B1/11G02B5/3025C08J7/043C08J7/046C08J7/042G02B5/30C08J7/0423C08J7/0427C08J2333/00C08J2451/08C09D5/002C09D151/08C09D167/02
Inventor 沈花燮朴俊昱林伊琅金倞源
Owner ANHUI HEMEI MATERIALS TECH CO LTD
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