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Optical polyester film

A polyester film, optical technology, used in optics, optical components, polyurea/polyurethane coatings, etc., can solve problems such as poor adhesion, achieve uniform light-resistant adhesion, less damage, and high product reliability.

Active Publication Date: 2021-12-07
TORAY ADVANCED MATERIALS KOREA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] While acrylic or urethane-based adhesives show excellent heat resistance and easy adhesion to UV-curable resins in post-processing, it was found that lamination with polyester as a base layer Poor adhesion of the film, so the primer layer often peels from the polyester base layer in its adhesion test

Method used

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  • Optical polyester film
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1 to 14

[0071] An optical polyester film was prepared by using a #5 wire bar with a primer composition (coating liquid) comprising the contents of each component (as shown in Table 1 below) per 100 parts by weight of polyurethane binder resin A 50 μm thick biaxially stretched polyester base film was applied, the primer layer was 0.1 μm thick after drying. The contents given in Table 1 show the solid contents of the respective components.

[0072]In addition, while preparing the primer composition as an aqueous dispersion, in addition to the components shown in Table 1, based on the total weight % of the coating liquid, 1.0 wt % of water and 10% by weight of an anionic surfactant in an aqueous dispersion of surfactant, and 0.5% by weight of an aqueous dispersion of silica particles comprising 30% by weight of water and 70% by weight of silica particles.

[0073] In addition, as shown in Table 1, the polyurethane resin in the primer composition is an aqueous dispersion of polyurethane ...

experiment example

[0081] (1) Measuring Adhesion

[0082] The adhesive force between the base film and the primer layer of the optical polyester films prepared in the embodiments and comparative examples was measured. For this, the surface of the primer layer is coated with an anti-glare coating liquid (AG coating liquid) by using a #5 wire bar, cured with UV rays, and formed in the film coated with the primer layer using a cutter. Lines were cut to arrange 2 mm x 2 mm squares in a 10 x 10 matrix. Cellophane tape (No. 405 available from NICHIBAN, 24mm wide) was attached to the film with the cut lines and a velvet rubbing tape was used to achieve a strong bond. After processing, remove the tape vertically. The area of ​​the primer layer remaining on the attachment layer was visually observed to calculate the adhesive force using Equation 1 below.

[0083] Formula 1

[0084] Adhesion (%)=(1-area without defects / 100)*100(%)

[0085] (2) Measuring Lightfast Adhesion

[0086] The adhesive force...

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Abstract

The present disclosure relates to an optical polyester film having very good optical and physical properties, which exhibits good coating properties, and achieves a uniform adhesive force and a uniform light-resistant adhesive force between the primer layer of the optical polyester film and a UV-curable resin coating layer such as an AG coating or a hard coating layer to reduce defective products, prolong its service life and achieve high quality.

Description

technical field [0001] The present disclosure relates to optical polyester films, and more particularly to improving optical polyester films in which at least one side of the polyester base film is coated with a primer layer due to the primer layer being damaged by UV rays during processing. Reduced adhesion to optical polyester films. Background technique [0002] Polyester films are widely used as industrial materials in various fields as well as display devices because of their dimensional stability, uniform thickness, and excellent optical transparency. In particular, biaxially stretched polyester films are used as base films in various industrial fields because of their dimensional stability, uniform thickness, and excellent optical transparency. Optical polyester films belong to the category of plastic films used for optical purposes along with other films, and are commonly used as components of display devices, such as components of PDP (plasma display, plasma displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/043C08J7/04C08L67/00
CPCC08J7/043C08J7/046C08J7/042C08J2367/00C08J2475/04C08J2467/00C08J5/18G02B1/04C09D5/002C09D7/63C09D7/65C09D7/61C09D175/04C08K5/0025C08K5/29C08K5/34922C08K5/3475C08L67/00
Inventor 洪德基高明俊韩承勋金吉中
Owner TORAY ADVANCED MATERIALS KOREA
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