Release film

A technology for release film and film, applied in the field of polystyrene release film, to achieve the effects of excellent curl resistance, sufficient curl resistance, and excellent heat-resistant dimensional stability

Inactive Publication Date: 2018-11-09
KURASHIKI BOSEKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, for example, in order to prevent welding during press molding, when a plastic film is used as a release film sandwiched between a mold and a material to be molded, the plastic film is usually subjected to a stretching process, so if it is damaged by heat If dimensional changes (heat shrinkage) occur on the plastic film, the film cannot fully follow the unevenness of the molding surface of the mold, and good shaping cannot be performed by the molding surface of the mold.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0092] Examples 1-5 / Comparative Examples 1-2

[0093] A mixture of the following components was melted and extruded through a T-die at a resin temperature of 280° C. using an extruder, and then cooled to obtain an unstretched film (precursor film). The unstretched film is subjected to the stretching step under the conditions described below. The stretching process includes a stretching treatment and a heat setting treatment, and the heat setting treatment performs a relaxation heat setting treatment at a predetermined temperature and a relaxation magnification. It should be noted that the stretching treatment is simultaneous biaxial stretching.

[0094] As mixture components, both Examples and Comparative Examples used a syndiotactic polystyrene resin, an antioxidant, and a lubricant.

[0095] As the syndiotactic polystyrene resin, "Zareck 142ZE" (manufactured by Idemitsu Kosan Co., Ltd., glass transition temperature 95° C., melting point 247° C.) was used.

[0096] As the ...

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Abstract

　The present invention provides a polystyrene mold-release film having sufficiently excellent heat dimension stability and curl resistance. The present invention pertains to a mold-release film composed of a biaxially oriented polystyrene film containing a syndiotactic polystyrene resin, the mold-release film being characterized in that at least one surface is matt-finished and the curl rate of the mold-release film is 80% or less.

Description

technical field [0001] The present invention relates to a release film, and particularly relates to a polystyrene-based release film excellent in transferability. Background technique [0002] When manufacturing printed circuit boards, ceramic electronic parts, semiconductor packages, lens parts, thermosetting resin products, thermoplastic resin products, decorative boards, etc., there are cases where molding dies, molding rolls, and the material to be molded are not welded between them. A plastic film is used as a release film. In addition, in the forming process of a thin film layer of thermosetting resin, thermoplastic resin, ceramics, metal, etc., and a predetermined treatment process, in order to support and protect the thin film layer, a thin film layer is sometimes laminated on the plastic film, and finally the plastic film is used as a release material. The mold film is peeled off and removed. In this way, the uses of the plastic film become diversified. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C59/02C08J5/18
CPCB29C37/0075B29C43/02B29K2025/06C08J5/18C08J2325/06
Inventor 中野正志明星芳树西松英明小田川友彦安田晴纪
Owner KURASHIKI BOSEKI KK
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