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Mold release film for production of ceramic green sheet

A technology for ceramic green sheets and mold release films, used in manufacturing tools, ceramic molding machines, coatings, etc., can solve the problem of inability to disappear thick protrusions, and achieve the effect of not heavy peeling force, excellent processability, and pinhole reduction.

Active Publication Date: 2020-08-11
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of fillers kneaded in PET, the coarse protrusions generated by the aggregation of the fillers cannot be completely eliminated, and there is a problem of becoming a defective factor of the product.
In particular, in an ultra-thin ceramic green sheet, the inorganic filler used as a ceramic material has a particle size of about 60 nm to 800 nm (Patent Documents 5 and 6). Therefore, if the thin film described in Patent Document 4 is used, there is a problem of peeling. The problem of creating localized holes in the surface

Method used

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  • Mold release film for production of ceramic green sheet
  • Mold release film for production of ceramic green sheet
  • Mold release film for production of ceramic green sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] Using a reverse gravure, coat the coating liquid 1 with the following composition on the surface layer A of the laminated film X1 so that the film thickness of the mold release layer after drying becomes 2.5 μm. After drying at 90°C for 30 seconds, use a high-pressure mercury lamp , irradiate ultraviolet rays to make it 200mJ / cm 2 , so as to obtain a release film for the manufacture of ultra-thin ceramic green sheets. The obtained release film was evaluated for release layer thickness, area surface roughness Sa, maximum peak height Rp, pinhole evaluation of ceramic green sheet, damage evaluation to ceramic green sheet, static friction coefficient, and dynamic friction coefficient.

[0144] (coating liquid 1)

[0145] Compound (I) 100.00 parts by mass

[0146] (Dipentaerythritol hexaacrylate, Shin-Nakamura Chemical Co., Ltd. A-DPH, solid content concentration 100%)

[0147] Resin (II) polyester resin 9.47 parts by mass

[0148] (Vylon (registered trademark) RV280 man...

Embodiment 2

[0155] The resin (II) was changed to a polyester urethane resin (Vylon (registered trademark) UR1400 manufactured by Toyobo Co., Ltd., solid content concentration: 30% by mass), and the following coating solution 2 was used. The solid content concentration of the coating liquid 2 was lower than that of the coating liquid 1 of Example 1. Coating was performed so that the film thickness of the release layer after drying would be 1.5 μm. A release film was obtained in the same manner as in Example 1 except that the coating liquid 2 was used and the film thickness of the release layer after drying was 1.5 μm. The obtained release film was evaluated for release layer thickness, area surface roughness Sa, maximum peak height Rp, pinhole evaluation of ceramic green sheet, damage evaluation to ceramic green sheet, static friction coefficient, and dynamic friction coefficient.

[0156] (coating solution 2)

[0157] Compound (I) 100.00 parts by mass

[0158] (Dipentaerythritol hexaac...

Embodiment 3

[0167] The following coating liquid 3 which increased the ratio of the release agent (III) compared with Example 2 was used. Coating was performed so that the film thickness of the release layer after drying would be 1.8 μm. A release film was obtained in the same manner as in Example 1, except that the coating liquid 3 was used and the film thickness of the release layer after drying was 1.8 μm. The obtained release film was evaluated for release layer thickness, area surface roughness Sa, maximum peak height Rp, pinhole evaluation of ceramic green sheet, damage evaluation to ceramic green sheet, static friction coefficient, and dynamic friction coefficient.

[0168] (coating solution 3)

[0169] Compound (I) 100.00 parts by mass

[0170] (Dipentaerythritol hexaacrylate, Shin-Nakamura Chemical Co., Ltd. A-DPH, solid content concentration 100%)

[0171] Resin (II) 31.50 parts by mass of polyester urethane resin (Vylon (registered trademark) UR1400 manufactured by Toyobo Co....

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Abstract

The invention provides a mold release film for molding of a ceramic green sheet, which has excellent releasability and is not likely to cause pin hole defects and damage such as cracks during releasing on an ultrathin ceramic green sheet that is molded with use of the mold release film. A mold release film for the production of a ceramic green sheet is obtained by superposing a mold release layerhaving a thickness of 0.2-3.5 [mu]m on at least one surface of a polyester film directly or with another layer being interposed therebetween, and is configured such that the surface of the mold release layer has a local surface roughness (Sa) of 5-40 nm and a maximum profile peak height (Rp) of 60 nm or less.

Description

technical field [0001] The present invention relates to a release film for producing an ultra-thin ceramic green sheet, and more specifically, to a release film capable of producing an ultra-thin ceramic green sheet that suppresses the occurrence of process failures due to pinholes, uneven thickness, and poor peeling. The release film for the manufacture of ultra-thin ceramic green sheets. Background technique [0002] Conventionally, a release film having a polyester film as a base material and a release layer laminated thereon has been used for molding ceramic green sheets such as multilayer ceramic capacitors (hereinafter referred to as MLCC) and ceramic substrates. In recent years, the thickness of ceramic green sheets tends to be thinner along with the miniaturization and increase in capacity of multilayer ceramic capacitors. Ceramic green sheets are molded by coating a slurry containing ceramic components such as barium titanate and a binder resin on a release film an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04B28B1/30B32B27/00B32B27/36C08F2/44C09D4/06C08J7/043C08J7/046
CPCB28B1/30B32B27/00B32B27/36C08F2/44C09D4/06C08J7/043C08J7/046C08J7/042B32B7/06C09D5/20C08J5/18
Inventor 松尾有加本乡有记
Owner TOYOBO CO LTD
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