Optical film and optical member using optical film

A technology of optical film and depth, which is applied in the field of optical film and optical components, can solve the problems of non-material, easy-to-break glass, etc., and achieve the effect of reducing yellowness and low yellowness

Inactive Publication Date: 2017-11-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass has the disadvantages of being easily broken and heavy, and it is not a sufficient material for the thinner, lighter, and more flexible displays in recent years.

Method used

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  • Optical film and optical member using optical film
  • Optical film and optical member using optical film
  • Optical film and optical member using optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] (Recipe for Varnish 1)

[0122] A polyimide-based polymer ("Neoprim C-6A20-G" manufactured by Mitsubishi Gas Chemical Co., Ltd.) having a glass transition temperature of 390° C. was prepared. A γ-butyrolactone solution (solution viscosity: 108.5 Pa·s) with a polyimide-based polymer concentration of 22% by mass, and silica particles with a solid content concentration of 30% by mass dispersed in γ-butyrolactone The dispersion and the dimethylacetamide solution of the alkoxysilane having an amino group were mixed and stirred for 30 minutes to obtain Varnish 1 as a mixed solution. The mass ratio of silica particles to polyimide-based polymers is 30:70, and the amount of alkoxysilanes having amino groups is 1.67 per 100 parts by mass of the total of silica particles and polyimide-based polymers. parts by mass.

[0123] (film making)

[0124] The varnish 1 prepared by the above method was casted on a PET film (A4100 manufactured by Toyobo Co., Ltd.: the arithmetic mean hei...

Embodiment 2

[0126] By the same formulation as in Example 1, a varnish 2 was prepared using a different Neoprim solution (concentration 22.3% by mass, solution viscosity 89.8 Pa·s) on the day of manufacture, and the varnish 2 made was coated on a PET film (Toyobo Co., Ltd. A4100 manufactured by the company: surface arithmetic mean height Sa=4.2nm) was cast and film-formed, heat-treated at 50° C. for 30 minutes, and heat-treated at 140° C. for 10 minutes to obtain a polyimide-based polymer film. The obtained polyimide-type polymer film was peeled off from a PET film, and it heat-processed at 210 degreeC for 1 hour further in nitrogen gas. The obtained polyimide-based polymer film had a thickness of 50 μm and a refractive index of 1.57.

[0127] In the obtained polyimide-based polymer film, YI was different from that of Example 1 due to the slight color difference of the polyimide.

Embodiment 3

[0144] A polyimide (KPI-300MXF(100) manufactured by Kawamura Sangyo Co., Ltd.) was prepared. This polyimide was dissolved in a 9:1 mixed solvent of N,N-dimethylacetamide and γ-butyrolactone, and 0.8 parts by mass of Sumika was added to 100 parts by mass of the polyimide. Sumisorb 350 manufactured by Chemtex Co., Ltd. was used as a UV absorber to prepare varnish 3 (concentration of polyimide: 17% by mass). This varnish was cast on a PET film (A4100 manufactured by Toyobo Co., Ltd.: arithmetic mean height Sa=4.2 nm) as a base material, and heat-treated at 50° C. to 70° C. for 60 minutes. The formed transparent resin film was peeled from the PET film, and the peeled transparent resin film was heated and dried at 200° C. for 40 minutes in the air atmosphere. The thickness of the film was 79 μm, and the refractive index was 1.56.

[0145] [Table 1]

[0146]

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Abstract

The invention proivdes an optical film being capable of reducing yellow degree. The optical film is described in such way: for a sunken part satisfying the following conditions (1) and (2), the number of the sunken parts is lower than 4 per 10000 [mu]m<2> on a single surface and a back surface of the optical film. (1) the depth of the sunken part is more than 200 nm; (2) the diameter of the part, which is higher than 200 nm in depth, of the sunken part is more than 0.7 [mu]m.

Description

technical field [0001] The present invention relates to an optical film and an optical member using the same. Background technique [0002] Conventionally, glass has been used as a material for various display members such as solar cells and displays. However, glass has disadvantages of being easily broken and heavy, and is not a sufficient material for the thinning, weight reduction, and flexibility of displays in recent years. Therefore, various films have been studied as transparent members of flexible devices instead of glass (Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2009-215412 Contents of the invention [0006] The inventors of the present invention have studied the application of a transparent resin film such as a polyimide film as a transparent member of a flexible device instead of glass. [0007] However, the conventional polyimide-type resin film often turns yellow,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/04
CPCC08J5/18C08J2379/08C08K3/36C08L79/08G02B1/04G02B5/0215G02B5/22
Inventor 池内淳一岸田明子
Owner SUMITOMO CHEM CO LTD
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