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Release film for producing ceramic green sheet

A ceramic green sheet and mold release film technology, which is applied in the direction of manufacturing tools, ceramic molding machines, synthetic resin layered products, etc., can solve the problems of low protrusion density, pinholes, high pressure, etc., achieve good coilability, prevent pinhole effect

Active Publication Date: 2018-12-21
TOYO TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the above-mentioned prior art, although the height of the protrusions is reduced, the density of the protrusions is low. Therefore, there is a problem that the pressure applied to the protrusions is large, and pinholes are generated when the ceramic green sheet is further thinned.

Method used

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  • Release film for producing ceramic green sheet
  • Release film for producing ceramic green sheet
  • Release film for producing ceramic green sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] (Adjustment of Slippery Coating Solution 1)

[0139] The slippery coating liquid 1 of the following composition was adjusted.

[0140] (Easy Slip Coating Solution 1)

[0141]

[0142] (manufacturing of polyester film)

[0143] The intrinsic viscosity (solvent: phenol / tetrachloroethane = 60 / 40) of the film raw material polymer is 0.62dl / g, and PET resin pellets (PET(II)) containing substantially no particles are reduced at 133Pa. Press down and dry at 135°C for 6 hours. Thereafter, it was supplied to an extruder, melted and extruded into a sheet at about 280° C., and quenched and solidified on a rotating cooling metal roll whose surface temperature was kept at 20° C. to obtain an unstretched PET sheet.

[0144] The unstretched PET sheet was heated to 100° C. in a heated roll set and an infrared heater, and then stretched 3.5 times in the longitudinal direction by a roll set with a peripheral speed difference to obtain a uniaxially stretched PET film.

[0145] Next...

Embodiment 2

[0149] Using a slippery coating in which the silica particles B-3 in the slippery coating solution 1 used in Example 1 were changed to silica particles B-4 (average particle diameter: 450 nm, solid content concentration: 40% by mass) In liquid 2, except for this, it carried out similarly to Example 1, and obtained the mold release film for ultrathin-layer ceramic green sheet manufacture.

Embodiment 3

[0151] Except having changed the easy-slip coating liquid 1 into the following easy-slip coating liquid 3, it carried out similarly to Example 1, and obtained the release film for ultrathin-layer ceramic green sheet manufacture.

[0152] (Easy Slip Coating Solution 3)

[0153]

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Abstract

Provided is an excellent release film for producing a ceramic green sheet, the release film being capable of attaining both satisfactorily suitability for winding and prevention of pinholes, local thickness unevenness, etc., even when forming a ceramic green sheet having a reduced thickness. The release film for producing a ceramic green sheet comprises a substrate that is a polyester film containing substantially no particles, a release coating layer formed on one surface of the substrate, and an easy-to-slip coating layer formed on the other surface and containing particles, wherein the easy-to-slip coating layer has an average surface region roughness (Sa) of 1-25 nm, a maximum projection height (P) of 60-500 nm, and an average roughness-curve-element length (RSm) of 10 [mu]m or less.

Description

technical field [0001] The present invention relates to a release film for producing ceramic green sheets. More specifically, it relates to a release film for ceramic green sheet production capable of achieving both good winding performance and prevention of pinholes, partial thickness unevenness, and the like even when the ceramic green sheet is thinned. Background technique [0002] Conventionally, there has been disclosed a technique for eliminating the problem of the release film in the state where the release film for ceramic green sheet production is wound by making the surface roughness of the base film opposite to the release agent layer (back surface) rough. Defects such as adhesion (blocking) between the front and back of the release film for ceramic green sheet production during storage (for example, refer to Patent Document 1). However, the aforementioned prior art has problems in that the protrusions are large, resulting in pinholes and partial thickness uneven...

Claims

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Application Information

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IPC IPC(8): B28B1/30B32B27/00B32B27/36C09D201/00
CPCB28B1/30B32B27/00B32B27/36C09D201/00C04B35/62218C08J5/18C08J7/04C09D5/20C09D167/00
Inventor 柴田悠介吉野贤二堀川谅
Owner TOYO TOYOBO CO LTD
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