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White polyester film for liquid crystal display reflector

A technology of liquid crystal display and polyester film, which is applied in the direction of instruments, chemical instruments and methods, coatings, etc., can solve the problems of liquid crystal display devices that are not suitable for light stability, achieve low pollution resistance, improve durability, reduce The effect of making losses

Active Publication Date: 2009-08-19
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film provided by Patent Document 4 is not suitable for liquid crystal display devices that require light stability, so it is desired to develop an optical film that has both light stability and anti-pollution properties

Method used

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  • White polyester film for liquid crystal display reflector
  • White polyester film for liquid crystal display reflector
  • White polyester film for liquid crystal display reflector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～19

[0215] The raw materials shown below were mixed according to the mixing ratio shown in Table 1. Extrusion temperature was made into 320 degreeC, this was supplied to the extruder A heated at 270-300 degreeC, and the base polymer of the polyester layer (A) was obtained.

[0216] ・Polyethylene terephthalate chip (F20S manufactured by Toray Co., Ltd.)

[0217] ・Copolymer of polyethylene glycol, polybutylene terephthalate, and poly(1,4-butylene glycol) with a molecular weight of 4,000 ("Hitrel" manufactured by Toray Dupont Co., Ltd.)

[0218] ・A copolymer obtained by copolymerizing 10 mol% of isophthalic acid and 5 mol% of polyethylene glycol in polyethylene terephthalate (T794M manufactured by Toray Co., Ltd.)

[0219] ・Polymethylpentene (TPX820 manufactured by Mitsui Chemicals Co., Ltd.)

[0220]・Silicon dioxide particles having the average particle diameter described in Table 1

[0221] · Polyethylene naphthalate (manufactured by Aldrich, d=1.328, m.p.250-290° C.)

[0222] ...

Embodiment 20～52

[0231] Put the raw materials of polyester layer (A) and polyester layer (B) shown in Table 4 and 5 into two extruders heated to 280°C respectively, and use a multi-layer feeding die set for confluence to make it The layer configuration and layer thickness are as described in Table 4, and the sheet was molded into a sheet shape with a die while maintaining the laminated state. The sheet is then cooled and solidified by a cooling drum with a surface temperature of 25°C, and the cooled and solidified unstretched film is heated to 90°C and stretched 2.9 times in the longitudinal direction (longitudinal direction), using a group of rollers at 25°C Allow to cool. On one side or both sides of the uniaxially stretched film, by microgravure coating (microgravure) at 4 g / m 2 (Wet) coating amount The aqueous coating liquid shown below was coated.

[0232] Among them, in Tables 4 and 5, the copolyester used refers to the polyester obtained by copolymerizing the dicarboxylic acid compone...

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Abstract

To improve not only the durability of a reflecting film but also that of a peripheral member, and to reduce manufacture loss by preventing adhesion of fine foreign materials such as dusts. Provided is a white polyester film for liquid crystal display reflectors, which contains a light stabilizer in a polyester film having fine air bubbles and has an average reflectivity of 97% or more on the surface of at least one side of the film.

Description

technical field [0001] The present invention relates to a white polyester film, and particularly relates to a white polyester film particularly suitable as a reflector for a liquid crystal display. More specifically, it relates to a structure in which a side light source (also called an edge light source) is used to illuminate a liquid crystal screen and a fluorescent tube is disposed directly above a reflective film (called a direct type), and a more efficient structure can be obtained. White polyester film for display reflectors as base material for reflectors with clear images. Background technique [0002] In recent years, displays using liquid crystals have been widely used as display devices such as personal computers, televisions, and mobile phones. Conventionally, when illuminating these liquid crystal displays, a backlight system in which a light source is placed from the back of the display or a side light system disclosed in Patent Document 1 has been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/08B32B27/36C08J5/18C08J7/04G02F1/1335C08J7/043C08J7/044
CPCC08J2367/02G02B5/0242C08J5/18C08J7/047G02B5/0284C08J2467/00G02B5/0247C08J7/0427C08J7/043C08J7/044G02B5/08B32B27/36
Inventor 奥田昌宽藤井秀树田中和典
Owner TORAY IND INC
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