Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1998-06-02
2000-05-02
Dawson, Robert
Stock material or miscellaneous articles
Composite
Of silicon containing
428451, 428910, 428 401, B32B 904
Patent
active
060570415
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a releasing film using, as a base film, a biaxially oriented film formed of polyethylene-2,6-naphthalenedicarboxylate. More specifically, the present invention relates to a carrier film that is used in molding of a resin sheet, a ceramic sheet or the like and that can impart surface properties of high precision to a surface of the molded article. The present invention further relates to a releasing film required in silicon wafer production or the like, which has excellent releasability and contains a small amount of impurities in a releasing layer and in which the transfer of the impurities contained in the base film to the surface of the releasing layer is controlled. The present invention still further relates to a releasing film (or a protective film) used for such a material requiring the prevention of a volatile component from volatilizing as a plaster containing a volatile medicinal component.
BACKGROUND ART
There have been typically used releasing films having a cured silicone resin layer formed thereon. They are used in a variety of application fields such as a carrier film used in the production of molded article or as a protective film for an adhesive layer or for a plaster, or the like. In respective fields where the conventional releasing films are now used, there have been demanded releasing films that have further improvement in properties such as releasability, dimensional stability, transfer of impurities, gas permeability or the like.
The use of the releasing films in some application fields and their properties required will be described below.
In the production of a molded article, the releasing film is used as a carrier film in molding of a resin sheet, a resin coat, a ceramic sheet or the like.
The resin sheet is molded by coating (casting) a resin solution containing, for example, vinyl chloride or the like, on a carrier film, heating the resulting carrier film to remove a solvent therefrom, and peeling off and separating the carrier film. It is used in applications such as a marking sheet.
The releasing film is used also for laminating and molding a prepreg in the production of a printed wiring base board. That is, a solution of a thermosetting resin such as a phenolic resin or an epoxy resin is coated directly on a releasing film or is impregnated into a glass fiber cloth or paper sheet laminated on the releasing film and subsequently, the resulting releasing film is heated to remove the solvent therefrom. The releasing film is then peeled off and separated to produce a prepreg.
The resin coat is produced, for example, by coating a carrier film surface with a coating solution obtained by dissolving a resin as an adhesive in a solvent and then heating the resulting carrier film to remove the solvent.
The ceramic sheet is produced as a molded article, for example, by coating a carrier film surface with a slurry obtained by dispersing a ceramic powder, a binder or the like in a solvent, heating the resulting carrier film to remove the solvent, and then peeling and removing the carrier film.
In general, out of surfaces of a resin sheet, ceramic sheet or the like, the surface from which a carrier film has been peeled off is used frequently for applications which must have surface properties of high precision. Therefore, the surface roughness of the base film used in the carrier film has a large influence on the surface roughness of the resin sheet, ceramic sheet or the like.
As a base film of the above carrier films, there are used a variety of films, particularly a biaxially oriented polyethylene terephthalate (may be abbreviated as PET hereinafter) film. The PET film usually has its surface roughened by incorporation of a filler or the like, for the improvement of its windability. Consequently, a resin sheet, a ceramic sheet and the like, which are produced by the use of a carrier film with a filler-containing PET film as a base film, has a rough surface and, when laminated in a plurality of layers, may contain gaps between the adjac
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Koyama Toshiya
Sumi Hiroyuki
Dawson Robert
Robertson Jeffrey B.
Teijin Limited
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