Release film and method for manufacturing release film
AssigneeKobayashi & Co., Ltd.
InventorsKeisuke Sakai, Nanae Tanaka
Life of this patent
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Abstract
To provide a release film having an electrostatic dissipative property. The present invention provides a release film comprising a base layer formed of a polyester resin and a surface layer formed of a tetrafluoroethylene resin that comprises an electrically conductive filler, and the release film has a surface resistivity Rs of 1×1011Ω or less. Preferably, the electrically conductive filler comprises carbon black, and the tetrafluoroethylene resin further comprises particles having an average particle size of 1 μm to 15 μm determined by laser diffraction particle size analysis.
Claims16
A release film, comprising:
- a base layer comprised of a polyester resin;
- and
- a surface layer comprised of a tetrafluoroethylene resin comprising an electrically conductive filler,
- wherein:
- the release film has a surface resistivity (Rs) of 1×1011Ω or less,
- the electrically conductive filler comprises carbon black,
- the tetrafluoroethylene resin is a cured product which comprises a reactive functional group-containing tetrafluoroethylene polymer and a curing agent,
- the reactive functional group-containing tetrafluoroethylene polymer comprises a polymer unit based on a hydroxy group-containing monomer and a polymer unit based on perfluoroolefin comprising tetrafluoroethylene and one or more of hexafluoropropylene and perfluoro (alkyl vinyl ethers),
- the tetrafluoroethylene resin comprises silicon dioxide particles each having an average particle size of 1 μm to 15 μm, as determined by laser diffraction particle size analysis, and
- an amount of the silicon dioxide particles relative to 100 parts by mass of the tetrafluoroethylene resin is 5.15 parts by mass to 15.79 parts by mass.
A method for manufacturing a release film, the method comprising:
- a surface layer forming step of forming, on one face of two faces of a base layer that is comprised of a polyester resin, a surface layer comprised of a tetrafluoroethylene resin comprising an electrically conductive filler, wherein:
- the electrically conductive filler comprises carbon black,
- the tetrafluoroethylene resin is a cured product of a tetrafluoroethylene resin composition containing a reactive functional group-containing tetrafluoroethylene polymer and a curing agent,
- the reactive functional group-containing tetrafluoroethylene polymer contains a polymer unit based on a hydroxy group-containing monomer and a polymer unit based on perfluoroolefin comprising at least tetrafluoroethylene and one or more of hexafluoropropylene and perfluoro (alkyl vinyl ethers),
- the tetrafluoroethylene resin comprises silicon dioxide particles,
- an average particle size of the silicon dioxide particles is 1 μm to 15 μm, as determined by laser diffraction particle size analysis,
- an amount of the silicon dioxide particles relative to 100 parts by mass of the tetrafluoroethylene resin is 5.15 parts by mass to 15.79 parts by mass, and
- the manufactured release film has a surface resistivity Rs of 1×1011Ω or less.
Dependencies are inferred from the claim text.