Applied film

A technology of coating film and coating liquid, which is applied in the field of coating film, can solve problems such as easy curling or slack, and achieve the effects of preventing oligomer precipitation, high industrial use value, and excellent appearance

Active Publication Date: 2015-10-28
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the curable resin layer is formed by thermal curing, high-temperature treatment is required to dissociate the blocking agent of the isocyanate-based resin, and curling or slack may easily occur during processing, so care must be taken in handling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] The mixture of polyester (B) and (E) blended in a weight ratio of 80 / 20 is used as the raw material of the surface layer, and only the polyester (A) is used as the raw material of the middle layer, which are respectively supplied to two extruders, After heating to 285°C and melting, layer A is used as the outermost layer (surface layer), layer B is used as the middle layer, and two types of three layers (A / B / A) are co-extruded to form a thickness ratio of A / B / A =4 / 117 / 4, using the electrostatic adhesion method, making it adhere to a mirror-faced cooling roll with a surface temperature of 40-50° C., cooling and solidifying it, and producing an unstretched polyethylene terephthalate film. After the film was stretched 3.4 times in the longitudinal direction by using the difference in the circumferential speed of the rollers while passing through a set of heating rollers at 85°C, the water-based coating shown in Table 1 below was applied to one side of the longitudinally str...

Embodiment 2～13

[0155] In Example 1, except having changed the coating agent composition into the coating agent composition shown in Table 1, it manufactured similarly to Example 1, and obtained the polyester film. The obtained polyester film had the characteristics shown in Table 3, and the film haze increase value (ΔH) due to the heat treatment was small, and the precipitation amount of the ester cyclic trimer was small, which was good.

Embodiment 14

[0157] In Example 1, the polyester film was obtained by the same method as in Example 1 except that the thickness composition ratio was set to A / B / A=5 / 178 / 5, and the thickness of the polyester film was changed to 188 μm. . Table 3 shows the properties of the obtained polyester film.

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Abstract

The present invention provides a coating film having exceptional characteristics, the coating film allowing the precipitating of oligomers from the surface of a film to be suppressed to a high extent; e.g., under exposure to high temperatures; and, when the film is stored, used, processed, etc., preventing any incidence of adverse events owing to the oligomers (ester cyclic trimers). A coating film having a coating layer formed from a coating liquid containing a multivalent aldehyde compound, the coating layer being formed on at least one surface of a single-layer polyester film containing 0.7% by weight or less of ester cyclic trimers or a multi-layer polyester film having a polyester surface layer containing 0.7% by weight or less of ester cyclic trimers.

Description

technical field [0001] This invention relates to a coating film, Specifically, It is related with the coating film which uses a polyester film as a base material, and there is little precipitation of an oligomer even after exposure to high temperature, for example. Background technique [0002] The polyester film is excellent in transparency, dimensional stability, mechanical properties, heat resistance, electrical properties, etc., and can be used in various fields. [0003] In particular, in recent years, use in touch panels and the like has increased, and use as a substrate of transparent conductive laminates instead of glass has increased. As such a transparent conductive laminate, a polyester film may be used as a base material, and an ITO (indium tin oxide) film may be formed by sputtering directly or via an adhesion-promoting coating layer thereon. Such a biaxially stretched polyester film is usually heat-processed. [0004] For example, there are treatments such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36C08J7/043
CPCB32B27/36B32B27/08B32B2255/10B32B2255/26B32B2307/202B32B2307/412B32B2457/208C09D1/00C08J2367/02C08J2433/14C08J2461/00C08J7/0427C08J2429/04C08J7/043C08J7/065
Inventor 川崎阳一神田俊宏川崎泰史
Owner MITSUBISHI CHEM CORP
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