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Release film

A release film, polymer technology, used in other household appliances, synthetic resin layered products, transportation and packaging, etc., can solve the problems of decreased film surface slipperiness, decreased productivity, poor deposition, etc., to avoid impurities. Effects of mixing, continuous productivity improvement, and high industrial value

Active Publication Date: 2015-07-01
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, although the ability to prevent oligomer precipitation is good, problems such as a decrease in the slipperiness of the film surface may occur when winding the product in a roll shape.
In addition, in the case of hard coating, offline installation is necessary, so there is a tendency for productivity to decrease due to the addition of one manufacturing process.
[0011] In addition, in the case of an annealing process, etc., when heat treatment is performed at a high temperature for a long time, when the heat resistance of the coating layer itself is insufficient, the oligomer precipitation preventing performance cannot reach the desired level, and the With continuous production, there may be problems with adhesion and deposition of oligomers over time from the film surface without a release layer or the film surface with a release layer on the surface of the transfer roller.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] Use the mixed raw materials obtained by mixing polyester (I) and (II) at the ratios of 90% and 10% as the raw material for the outermost layer (surface layer), and polyester (I) as the raw material for the middle layer, and supply 2 sets respectively After the extruder was melted at 285°C, it was co-extruded in a two-layer structure (surface layer / middle layer / surface layer) on a cooling roll set at 40°C, and cooled and solidified to obtain unstretched sheet. Next, using the difference in the circumferential speed of the rollers, the film was stretched 3.4 times in the longitudinal direction at a film temperature of 85°C, and then a coating consisting of the following coating agent was applied to both sides of the film so that the coating amount (after drying) was a predetermined amount. After the cloth layer, it was supplied to a tenter, stretched 4.3 times in the transverse direction at 120°C, and heat-treated at 225°C, then relaxed in the transverse direction to obtai...

Embodiment 2～ Embodiment 7

[0156] In Example 1, the coating layer was changed to the coating agent composition shown in Table 1, except that it was produced in the same manner as in Example 1 to obtain a release film. The characteristics of the obtained release film are shown in Table 2 below.

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Abstract

The object of the present invention is to provide a release film in which the oligomer precipitation from the film surfaces constituting the release film in the respective film processing steps such as an adhesive-applying step of, drying step and sticking step is reduced as possible and it can be attained to improve the continuous production of film. The above object is attained by a release film comprising: a polyester film, coating layers which is formed on both surfaces of said polyester film and comprises a polymer containing ammonium base, a polymer containing polyethylene glycol and a crosslinking agent, and at least one release layer formed on at least one surface of said coating layers.

Description

Technical field [0001] The present invention relates to a mold release film, and relates to a mold release film suitable for optical applications requiring a higher degree of transparency, such as touch panel manufacturing and liquid crystal polarizing plate manufacturing. Background technique [0002] Conventionally, release films using polyester films as base materials have been used in various applications. For example, in the touch panel manufacturing process, the structure of (A) hard coat layer / polyester film / adhesive layer / release layer / polyester film (B) is exemplified (Patent Documents 1 and 2). [0003] With the heat treatment of the release film, low molecular weight substances (especially cyclic trimers) contained in the polyester film are precipitated and crystallized on the surface of the film. Due to the occurrence of coating defects, it is difficult to obtain high-precision transparent conductivity. The case of the film. [0004] In the processing process, when a re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36B32B27/00B32B27/30C08J7/043C08J7/046
CPCY10T428/31794B32B2457/202C08J2367/02C08J2433/06B32B2255/10C08J7/042B32B2255/28C08J2483/04B32B2307/748B32B27/36B32B2270/00B32B2255/26B32B2250/244B32B2457/208C08J7/043C08J7/046B32B2367/00
Inventor 井崎公裕吉原贤司藤田真人
Owner MITSUBISHI CHEM CORP
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