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Mold-release film

A release film and resin technology, which is applied in the direction of synthetic resin layered products, coatings, chemical instruments and methods, etc., can solve the problems such as the sharp increase of the adhesive force of the adhesive sheet and the inability of the release film to be peeled off from the adhesive sheet. Achieve excellent mold release effect

Active Publication Date: 2018-09-28
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, a PSA sheet whose adhesive component is a reactive (curable) resin has a problem that the adhesive force of the PSA sheet increases rapidly over time when a release film is attached and stored at room temperature for a long period of time. The release film cannot be peeled off from the adhesive sheet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] The aqueous dispersion of acid-modified polyolefin resin "E-1" and "E-8", the aqueous polyvinyl alcohol solution "OH-1" and The aqueous solution of the oxazoline compound (manufactured by Nippon Shokubai Co., Ltd., EPOCROS WS-700, solid content concentration 25% by mass) was mixed so that the solid content ratio of each component became the value shown in Table 2 to obtain a liquid for resin layer formation .

[0166] Put polyethylene terephthalate (manufactured by Nippon Gushi Corporation, UT-UBR, intrinsic viscosity: 0.62, glass transition temperature: 78°C, melting point: 255°C) into an extruder with a screw diameter of 90 mm. The resin for layer A was melted at 280°C. Polyterephthalene containing silica particles (manufactured by Nikkei Catalyst Co., Ltd., OSCAL (EN-5001SIV), particle size 1.0 μm) was added so that the content became 0.030% by mass. Ethylene formate (intrinsic viscosity: 0.62, glass transition temperature: 78°C, melting point: 255°C) was put into an e...

Embodiment 2～20、 comparative example 1～8

[0170] Except having changed the composition of the liquid material for resin layer formation so that the composition of the resin layer became the description of Tables 2-4, it carried out similarly to Example 1, and obtained the release film.

[0171] It should be noted that in Example 19, the base film was changed to two types of three layers with a layer thickness ratio (layer A / layer B / layer A) of 2 / 6 / 2. In Example 20, the base The material film was changed to a single layer with a layer thickness ratio (layer A / layer B) of 10 / 0.

Embodiment 21

[0173] After coating the liquid for forming the resin layer prepared in Example 1 on the corona-treated surface of a biaxially stretched polyester film (manufactured by Unigene, EMBLET PET-38, thickness 38 μm) using a Meyer rod, After drying at 120°C for 30 seconds to form a resin layer with a thickness of 0.5 μm on the film, it was cured at 50°C for 2 days to obtain a release film.

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Abstract

Provided is a mold-release film in which at least one surface of a substrate film includes a resin layer, wherein the mold-release film is characterized in that: the resin layer contains 100 parts bymass of an acid-modified polyolefin resin, 10-1,000 parts by mass of a hydroxyl-group-containing resin, and 0.3-50 parts by mass of a crosslinking agent; the acid-modified polyolefin resin contains acid-modified components, acrylic acid ester components, and olefin components; and the olefin components contain propylene components.

Description

Technical field [0001] The present invention relates to a release film suitable as a film for protecting adhesive and adhesive tapes, films, and the like. Background technique [0002] Adhesive / adhesive films and sheets (hereinafter referred to as adhesive sheets) are widely used as surface protection films for decorative panels, coated steel sheets, window glass, liquid crystal panels, retardation plates, light guide plates, etc., and are used as Components of flexible printed circuit boards, aircraft, etc. [0003] In order to prevent blocking and protect the adhesive and adhesive surface (hereinafter referred to as the adhesive surface), these adhesive sheets have a release film attached to the adhesive surface. In general, it is desirable that the release film has an appropriate adhesive strength so that it does not peel off due to slight vibration or impact during the manufacturing process and can be smoothly peeled off during peeling. [0004] For example, Patent Document 1 d...

Claims

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Application Information

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IPC IPC(8): B32B27/32B32B27/36B32B27/34B32B27/00
CPCB32B27/00B32B27/32B32B27/34B32B27/36B32B27/08B32B2255/26B32B2255/10B32B2307/748B32B2307/212
Inventor 穴田有弘奥村畅康阪仓洋
Owner UNITIKA LTD