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Optical polyester film

A polyester film and optical technology, applied in polyether coatings, coatings, primers, etc., can solve the problems of reduced adhesion, heat resistance, poor moisture resistance, and insufficient adhesion, and achieve Effects of preventing turbidity or whitening, excellent heat resistance, and excellent adhesion

Pending Publication Date: 2021-11-09
TORAY ADVANCED MATERIALS KOREA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, a resin having an acryl group or a resin layer having a styrene and acrylic structure as devised in Japanese Patent Nos. 6040934 and 6023227 may have sufficient adhesiveness to polyester-based films, but suffers in heat resistance, Poor moisture-resistant adhesion and insufficient adhesion during post-treatment, e.g., of primer treatments, lens treatments, anti-reflection layers or hardcoats as other substrates
Furthermore, according to the method of designing a resin layer using acrylic-modified polyester on the surface of a film as in Japanese Patent Laid-Open No. 4-263937 and No. 2003-012841, an acrylic group whose glass transition point is higher than a certain temperature Partially contained in the acrylic modified polyester, but when the resin layer is cured, defects or cracks appear in the resin layer, thereby failing to exhibit sufficient oligomer inhibition effect and reducing the transparency and adhesion of the laminated film
Furthermore, in the method of using an additive as in Japanese Patent Laid-Open No. 2006-281498, the additive itself bleeds out onto the surface layer of the resin layer over time after the resin layer is formed or after film formation, thereby reducing adhesion and Risk of whitening of the resin film or contamination of the film surface (as in the case of oligomer precipitation)

Method used

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  • Optical polyester film
  • Optical polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 6

[0117] The method of producing the polyester film used as the base film before applying the primer coating solution of this example is as follows:

[0118] First, polyethylene terephthalate (PET) resin pellets were dried at 135°C for 6 hours under reduced pressure (1.3 hPa), supplied to an extruder, and melt-extruded at 280°C to form a sheet was formed as a sheet, and quenched and solidified on a metal roll maintained at a surface temperature of 20° C. to obtain a cast film having a thickness of 1024 μm.

[0119] Then, the obtained cast film was heated to 100°C with a heating roll set and an infrared heater, and then stretched in the longitudinal direction with a series of rolls with different peripheral speeds at a draw ratio of 3.2 times to obtain a uniaxial film used as a substrate. The PET film was oriented, and then, the uniaxially oriented film was clamped at the ends with clips, introduced into a hot air zone, and dried. Thereafter, the dried film was stretched in the ...

experiment example

[0133] 1. Measurement of haze and haze change before and after heat treatment

[0134] After the coating solutions prepared in Examples and Comparative Examples were applied to polyester films and cured, haze was measured using a haze meter manufactured by Nippon Denshoku Industries Co., Ltd.

[0135] After checking the side haze, the samples were stored at 150° C. for 1 hour using an electric dryer. After 1 hour, the sample was taken out, and the haze was measured again using a haze meter manufactured by Nippon Denshoku Industries Co., Ltd. When physical properties were measured after heat treatment, changes in haze before and after heat treatment were calculated. The change in haze was calculated as the average value of measurements obtained from a total of ten identical samples.

[0136] 2. Measurement of adhesion after room temperature adhesion test and humidity resistance test

[0137] The adhesion of the primer layer was measured at room temperature and under moisture...

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Abstract

The present invention pertains to an excellent optical polyester film comprising a polymeric primer layer formed on one or both surfaces of a substrate film, wherein the polymeric primer layer has excellent adhesiveness due to the application of a carboxylic group-containing acrylic resin and a polyalkylene oxide resin, as well as a thermosetting coating liquid crosslinked using at least one crosslinking agent selected from among carbodiimide, isocyanate, and melamine compounds, and transparency is maintained by preventing oligomer precipitation that results from heat treatment, thus allowing the optical polyester film to be effectively used in a coating process, which includes a heating process, for optical functionality.

Description

technical field [0001] The present invention relates to an optical polyester film, and more particularly, to an optical polyester film which is a film applied inside a touch panel, a liquid crystal display (LCD), a plasma display panel (PDP), etc. and has a Primer layer to improve processability of the laminated optical polyester film of the structure; and is designed to prevent oligomers from being involved in uniform adhesion and Precipitates from the polyester film during heat treatment processing. Background technique [0002] In general, polyester films are excellent in dimensional stability, thickness uniformity, and optical transparency, and thus find use in various applications including not only as display devices but also as various industrial materials. Among polyester films, an optical polyester film is a plastic film used for optics, and more specifically, a plastic film is widely used as a component of a display device. Polyester films are used when optical c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/043C08J5/18C08K5/29C08K5/3492C08K5/00C09D133/06C09D171/02C09D5/00C09D7/61
CPCC09D7/60C09D171/02C08J7/04C09D133/06C08K5/00C09D7/40C09D5/00C08K5/3492C08K5/29C08J5/18C08K5/34922C08K5/0025C09D5/002C09D7/67C09D7/68C08J2471/02C08J2433/00C08J2367/00C08J7/043
Inventor 金珉湖张允丁金吉中
Owner TORAY ADVANCED MATERIALS KOREA