Release film

Abstract

Provided is a release film that has a minimum amount of oligomers precipitating out from the surfaces of the release film during various production steps thereof, such as an adhesive coating step, a drying step, and a release-film bonding step, and that can contribute to the improvement of continuous productivity. The release film has, on both sides of a polyester film, a coating layer containing an ammonium-base-containing polymer, a polyethylene-glycol-containing polymer, and a cross-linking agent. A release layer is laminated onto at least one of the 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...

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.

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