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Laminated polyester film

A technology of polyester film and laminated film, applied in the field of laminated polyester film, can solve the problems of insufficient adhesiveness, inability to satisfy the adhesiveness of the coating, and inability to satisfy the same requirements at the same time.

Inactive Publication Date: 2003-11-19
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to the above, the adhesion to various coatings cannot be satisfied at the same time.
[0010] That is to say, the above-mentioned polyester film has the problem of not being able to satisfy both the adhesiveness of the ink that is accompanied by cure shrinkage like ultraviolet curable ink, or water-soluble and hydrophilic resins such as polyvinyl alcohol.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] PET (polyethylene terephthalate) particles (limited viscosity 0.63 dl / g) containing 0.015% by weight of colloidal silicon dioxide with an average particle diameter of 0.4 μm and 0.005% by weight of colloidal silicon dioxide with an average particle diameter of 1.5 μm ) after being fully vacuum-dried, supplied to the extruder, melted at 285°C, extruded into a sheet form by a T-shaped nozzle, and wound on a mirror casting reel with a surface temperature of 25°C using an externally applied electrostatic casting method, and allowed to cool and solidify . This unstretched film was heated to 85° C. and stretched 3.3 times in the longitudinal direction to obtain a uniaxially stretched film. The film was subjected to corona discharge treatment in air, and a laminating film forming coating liquid at 25°C was applied. The coated uniaxially stretched film is clamped with clips, introduced into the preheating section of the tenter at the same time, dried at 90°C, and stretched 3.3...

Embodiment 2

[0165] A laminated PET film was obtained in the same manner as in Example 1, except that a1 / b1=70 / 30 (solid content weight ratio) was set in the coating solution for forming a laminated film in Example 1. The results are shown in Table 1.

Embodiment 3

[0167] A laminated PET film was obtained in the same manner as in Example 1, except that a1 / b2=50 / 50 (solid content weight ratio) in the coating solution for forming a laminated film in Example 1. The results are shown in Table 1.

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PUM

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Abstract

Provided is a laminated polyester film, in which a laminated layer comprising two types of polyester resins having different glass transition points from each other is formed on at least one side of polyester film wherein the two types of polyester resins are composed of a polyester resin (A) having a glass transition point of from 60 DEG C to 100 DEG C, and a polyester resin (B) having a glass transition point of from 0 DEG C to 60 DEG C and the polyester resin (B) contains a specified component, and a dicarboxylic acid component having a sulfonic acid metal base is set as a specified ratio in entire dicarboxylic acid components in the polyester resins (A) and (B), satisfies adhesiveness to various types of coating materials which has conventionally been incompatible and, further, satisfies anti-blockingproperties,transparency,scratch resistance and the other properties.

Description

technical field [0001] The present invention relates to an improvement of a laminated polyester film, and more specifically, to a laminated polyester film excellent in adhesion to various coverings. Background technique [0002] Because biaxially oriented polyester film has excellent properties such as dimensional stability, mechanical properties, heat resistance, transparency, electrical properties and chemical resistance, it is used as magnetic recording materials, packaging materials, electrical insulation materials, various photographic materials, etc. It is widely used as substrate film for many purposes such as printing process materials and so on. [0003] In general, since the surface of the biaxially oriented polyester film is highly crystallinely oriented, there is a disadvantage of lack of adhesion with various coatings or inks. Therefore, conventionally, studies have been conducted to impart adhesiveness to the surface of polyester films by various methods. [...

Claims

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Application Information

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IPC IPC(8): B32B27/36B41M5/52C08L67/02
CPCY10S428/91C08L67/02C08L67/025B32B27/36B41M5/508Y10T428/2495Y10T428/25Y10T428/28Y10T428/31786Y10T428/31797C08L2666/18
Inventor 窪田有理三村尚高田育柳橋真人
Owner TORAY IND INC
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