WO2017199774A1 - セラミックグリーンシート製造用離型フィルム - Google Patents
セラミックグリーンシート製造用離型フィルム Download PDFInfo
- Publication number
- WO2017199774A1 WO2017199774A1 PCT/JP2017/017354 JP2017017354W WO2017199774A1 WO 2017199774 A1 WO2017199774 A1 WO 2017199774A1 JP 2017017354 W JP2017017354 W JP 2017017354W WO 2017199774 A1 WO2017199774 A1 WO 2017199774A1
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- WIPO (PCT)
- Prior art keywords
- ceramic green
- film
- green sheet
- mass
- coating layer
- Prior art date
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- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007763 reverse roll coating Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62218—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic films, e.g. by using temporary supports
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Definitions
- the present invention relates to a release film for producing ceramic green sheets. More specifically, the present invention relates to a release film for producing a ceramic green sheet that can achieve both good winding properties and prevention of pinholes and partial thickness variations even when the ceramic green sheet is thinned.
- the release film for producing ceramic green sheets is stored in a rolled state by making the surface roughness of the surface (back surface) opposite to the surface provided with the release agent layer of the base film relatively rough.
- a technique is disclosed that eliminates problems such as sticking (blocking) of the release film for producing a ceramic green sheet when it is applied (see, for example, Patent Document 1).
- such a conventional technique has a problem that pinholes and partial thickness variations occur due to large protrusions.
- the present invention has been made against the background of the problems of the prior art. That is, the object of the present invention is to produce an excellent ceramic green sheet that can achieve both good winding properties and prevention of pinholes and partial thickness variations even when the ceramic green sheet is thinned. It is to provide a release film.
- the present invention has the following configuration.
- a polyester film substantially free of particles is used as a base material, a release coating layer is provided on one surface of the base material, and a slippery coating layer containing particles is provided on the other surface. Having an average surface roughness (Sa) of 1 nm to 25 nm, a maximum protrusion height (P) of 60 nm to 500 nm, and an average length (RSm) of the roughness curve element of 10 ⁇ m or less.
- Sa surface roughness
- P maximum protrusion height
- RSm average length of the roughness curve element of 10 ⁇ m or less.
- a release film for producing a ceramic green sheet characterized in that 2. 2.
- the release film for producing a ceramic green sheet according to the first aspect wherein the area average surface roughness (Sa) of the release coating layer is 5 nm or less and the maximum protrusion height (P) is 30 nm or less. 3.
- a method for producing a ceramic green sheet comprising using the release film for producing a ceramic green sheet according to any one of the first to third aspects. 5).
- the method for producing a ceramic green sheet according to the fourth aspect wherein the thickness of the ceramic green sheet to be produced is 0.2 ⁇ m or more and 2 ⁇ m or less. 6).
- a method for producing a ceramic capacitor, wherein the method for producing a ceramic green sheet according to the fourth or fifth aspect is adopted.
- the release film for producing a ceramic green sheet of the present invention (hereinafter sometimes simply referred to as a release film) has a release coating layer on one side of a biaxially oriented polyester film as a base film, and particles on the other side.
- a release film having an easy-to-slip coating layer has a release coating layer on one side of a biaxially oriented polyester film as a base film, and particles on the other side.
- the film preferably used as a substrate in the present invention is a film composed of a polyester resin, and a polyester film mainly containing at least one selected from polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. preferable.
- the film which consists of polyester which the third component monomer copolymerized as a part of dicarboxylic acid component of the above polyesters or a diol component may be sufficient.
- a polyethylene terephthalate film is most preferable from the balance between physical properties and cost.
- the polyester film may be a single layer or a multilayer. Moreover, as long as it exists in the range with the effect of this invention, each of these layers can contain various additives in a polyester resin as needed.
- the additive include an antioxidant, a light-resistant agent, an anti-gelling agent, an organic wetting agent, an antistatic agent, and an ultraviolet absorber.
- the release film of the present invention has an easy-slip coating layer on one surface of a polyester base film as described above.
- the easy-slip coating layer preferably contains at least a binder resin and particles.
- Binder resin in the easy-to-slip coating layer Although it does not specifically limit as binder resin which comprises an easy-slip coating layer, as a specific example of a polymer, polyester resin, acrylic resin, urethane resin, polyvinyl resin (polyvinyl alcohol etc.), polyalkylene glycol, polyalkylene imine, methylcellulose , Hydroxycellulose, starches and the like. Among these, it is preferable to use a polyester resin, an acrylic resin, or a urethane resin from the viewpoint of particle retention and adhesion. In consideration of familiarity with the polyester film, a polyester resin is particularly preferable.
- the polyester of the binder is preferably a copolyester.
- the polyester resin may be modified with polyurethane.
- urethane resin is mentioned as another preferable binder resin which comprises the easy-slip coating layer on a polyester base film.
- the urethane resin include polycarbonate polyurethane resin.
- a polyester resin and a polyurethane resin may be used in combination, or other binder resins described above may be used in combination.
- the slippery coating layer in order to form a crosslinked structure in the slippery coating layer, may be formed to contain a crosslinking agent.
- a crosslinking agent By containing a crosslinking agent, it becomes possible to further improve the adhesion under high temperature and high humidity.
- Specific examples of the crosslinking agent include urea, epoxy, melamine, isocyanate, oxazoline, and carbodiimide.
- a catalyst etc. can be used suitably as needed.
- the slippery coating layer preferably contains lubricant particles in order to impart slipperiness to the surface.
- the particles may be inorganic particles or organic particles, and are not particularly limited.
- Inorganic particles such as magnesium and barium sulfate, (2) acrylic or methacrylic, vinyl chloride, vinyl acetate, nylon, styrene / acrylic, styrene / butadiene, polystyrene / acrylic, polystyrene / isoprene, polystyrene
- the average particle diameter of the particles is preferably 10 nm or more, more preferably 20 nm or more, and further preferably 30 nm or more.
- the average particle size of the particles is 10 nm or more, it is preferable that aggregation is difficult and slipperiness can be secured.
- the average particle size of the particles is preferably 1000 nm or less, more preferably 800 nm or less, and even more preferably 600 nm or less. It is preferable that the average particle diameter of the particles is 1000 nm or less because transparency is maintained and the particles do not fall off.
- a mixture of small particles having an average particle size of about 10 to 200 nm and large particles having an average particle size of about 300 to 1000 nm can also be described as the region surface average roughness (Sa) and the maximum protrusion height (described later).
- P region surface average roughness
- the mass content of the small particles is larger than the mass content of the large particles with respect to the entire solid content of the coating layer.
- the average particle size of the particles is measured by observing particles in the cross section of the processed film with a transmission electron microscope or a scanning electron microscope, observing 100 non-aggregated particles, and using the average value for the average particle size. It was performed by the method of diameter.
- the shape of the particles is not particularly limited as long as the object of the present invention is satisfied, and spherical particles and irregular non-spherical particles can be used.
- the particle diameter of the irregular shaped particles can be calculated as the equivalent circle diameter.
- the equivalent circle diameter is a value obtained by dividing the observed area of the particle by ⁇ and calculating the square root to double.
- the ratio of the particles to the total solid content of the easy-coating layer is preferably 50% by mass or less, more preferably 40% by mass or less, and further preferably 30% by mass or less.
- the ratio of the particles to the total solid content of the easy-to-slip coating layer is 50% by mass or less, transparency is maintained, and the particles are not easily dropped from the easy-slip coating layer, which is preferable.
- the ratio of the particles to the total solid content of the easy-coating layer is preferably 1% by mass or more, more preferably 1.5% by mass or more, and further preferably 2% by mass or more. If the ratio of the particles to the total solid content of the slippery coating layer is 1% by mass or more, the slipperiness can be secured, which is preferable.
- the following method can be used.
- the slippery coating layer provided on the processed film is extracted from the processed film using a solvent or the like and dried to take out the slippery coating layer.
- only the inorganic component can be obtained by applying heat to the resulting slippery coating layer and burning off the organic component contained in the slippery coating layer with heat.
- the mass% of the particles contained in the easy-to-slip coating layer can be measured. At this time, measurement can be performed with high accuracy by using a commercially available differential heat / thermogravimetric simultaneous measurement device.
- additives may be contained within a range that does not impair the coating appearance.
- examples of the additive include fluorescent dyes, fluorescent brighteners, plasticizers, ultraviolet absorbers, pigment dispersants, foam suppressors, antifoaming agents, and preservatives.
- the easy-slip coating layer may contain a surfactant for the purpose of improving leveling properties during coating and defoaming the coating solution.
- the surfactant may be any of cationic, anionic, and nonionic surfactants, but is preferably a silicone, acetylene glycol, or fluorine surfactant. These surfactants are preferably contained in the coating layer in such a range that the appearance of the coating does not become abnormal when added excessively.
- both a so-called in-line coating method in which a polyester base film is simultaneously formed and a so-called off-line coating method in which a polyester base film is formed and then separately applied with a coater can be applied. Is more efficient and more preferable.
- a known arbitrary method can be used as a method for coating the coating liquid on a polyethylene terephthalate (hereinafter sometimes abbreviated as PET) film.
- PET polyethylene terephthalate
- reverse roll coating method gravure coating method, kiss coating method, die coater method, roll brush method, spray coating method, air knife coating method, wire bar coating method, pipe doctor method, impregnation coating method, curtain coating method, etc.
- reverse roll coating method gravure coating method, kiss coating method, die coater method, roll brush method, spray coating method, air knife coating method, wire bar coating method, pipe doctor method, impregnation coating method, curtain coating method, etc.
- a method of applying a coating solution containing a solvent, particles, and a resin to the polyester film and drying may be mentioned.
- the solvent include an organic solvent such as toluene, water, or a mixed system of water and a water-soluble organic solvent.
- water alone or a so-called aqueous system in which water is mixed with a water-soluble organic solvent are preferred.
- the concentration of the solid content of the easy-to-slip coating liquid is preferably 0.5% by mass or more, more preferably 1% by mass or more, although it depends on the type of binder resin and the type of solvent.
- the solid concentration of the coating solution is preferably 35% by mass or less, and more preferably 20% by mass or less.
- the drying temperature after coating also depends on the type of binder resin, the type of solvent, the presence or absence of a crosslinking agent, the solid content concentration, etc., but is preferably 70 ° C. or higher, and preferably 250 ° C. or lower.
- the polyester film used as a base film can be manufactured according to the manufacturing method of a general polyester film.
- the polyester resin is melted and the non-oriented polyester extruded and formed into a sheet shape is stretched in the longitudinal direction by utilizing the speed difference of the roll at a temperature equal to or higher than the glass transition temperature, and then stretched in the transverse direction by a tenter.
- the method of performing heat processing is mentioned.
- a method of biaxial stretching in the tenter at the same time in the vertical and horizontal directions is also mentioned.
- the polyester film as the base film may be a uniaxially stretched film or a biaxially stretched film, but is preferably a biaxially stretched film.
- the thickness of the polyester film substrate is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 15 ⁇ m or more. When the thickness is 5 ⁇ m or more, it is preferable that wrinkles do not easily occur during conveyance of the film.
- the thickness of the polyester film substrate is preferably 50 ⁇ m or less, more preferably 45 ⁇ m or less, and even more preferably 40 ⁇ m or less. A thickness of 40 ⁇ m or less is preferable because the cost per unit area is reduced.
- in-line coating it may be applied to an unstretched film before stretching in the machine direction or may be applied to a uniaxially stretched film after stretching in the machine direction and before stretching in the transverse direction.
- coating is performed before stretching in the machine direction, it is preferable to provide a drying step before roll stretching.
- the film heating process in the tenter can also serve as the drying process, and therefore it is not always necessary to provide a separate drying process. The same applies to simultaneous biaxial stretching.
- the film thickness of the easy-slip coating layer is preferably 0.001 ⁇ m or more, more preferably 0.01 ⁇ m or more, still more preferably 0.02 ⁇ m or more, and particularly preferably 0.03 ⁇ m or more. It is preferable that the thickness of the coating layer is 0.001 ⁇ m or more because the film forming property of the coating film is maintained and a uniform coating film can be obtained.
- the film thickness of the easy-slip coating layer is preferably 2 ⁇ m or less, more preferably 1 ⁇ m or less, still more preferably 0.8 ⁇ m or less, and particularly preferably 0.5 ⁇ m or less. It is preferable that the coating layer has a thickness of 2 ⁇ m or less because there is no risk of blocking.
- the ceramic green sheet to be coated and molded on the mold release coating layer described later is wound into a roll together with the mold release film after coating and molding. At this time, it winds up in the state which the slipperiness application layer of the release film contacted the ceramic green sheet surface.
- the outer surface of the easy-to-slip coating layer (the surface of the easy-to-slip coating layer of the entire coating film not in contact with the polyester film) needs to be reasonably flat.
- the surface average roughness (Sa) is preferably 1 nm to 25 nm and the maximum protrusion height (P) is preferably 60 nm to 500 nm.
- the average surface roughness (Sa) of the outer surface of the easy-to-slip coating layer is 1 nm or more and the maximum protrusion height (P) is 60 nm or more, the easy-to-slip coating surface is not too smooth and maintains an appropriate slipperiness. This is preferable because it is possible. If the area surface average roughness (Sa) is 25 nm or less and the maximum protrusion height (P) is 500 nm or less, the easy-slip coating surface does not become too rough, and defects in the ceramic green sheet due to the protrusion do not occur.
- the average length (RSm) of the roughness curve elements is preferably 10 ⁇ m or less.
- the average length (RSm) of the roughness curve element is more preferably 5 ⁇ m or less, and further preferably 3 ⁇ m or less.
- the average length (RSm) of the roughness curve element is too small, it is related to the excessive content of particles in the easy-to-slip coating layer, and the area surface average roughness (Sa) becomes large.
- the maximum protrusion height (P) it is preferably 0.1 ⁇ m or more, may be 0.5 ⁇ m or more, and may be 1 ⁇ m or more.
- the average particle diameter of the particles contained in the easy-coating layer is 1000 nm or less. More preferably, it is 800 nm or less, More preferably, it is 600 nm or less. When the particle diameter is 1000 nm or less, the distance between the particles does not become too large, and RSm is preferably adjusted within a predetermined range.
- the resin constituting the release coating layer in the present invention is not particularly limited, and silicone resins, fluororesins, alkyd resins, various waxes, aliphatic olefins and the like can be used, and each resin can be used alone or in combination of two or more. You can also
- a silicone resin is a resin having a silicone structure in the molecule, and examples thereof include a curable silicone, a silicone graft resin, and a modified silicone resin such as alkyl modification. It is preferable to use a reactive cured silicone resin from the viewpoint of properties.
- a reactive cured silicone resin an addition reaction type, a condensation reaction type, an ultraviolet ray or electron beam curing type, or the like can be used. More preferably, a low-temperature curable addition reaction system that can be processed at a low temperature, and an ultraviolet ray or electron beam curing system are preferable. By using these materials, the polyester film can be processed at a low temperature. As a result, a polyester film with high flatness can be obtained with less heat damage to the polyester film during processing, and defects such as pinholes can be reduced even when manufacturing an ultra-thin ceramic green sheet having a thickness of 0.2 to 2 ⁇ m. .
- addition reaction type silicone resin examples include those obtained by reacting polydimethylsiloxane having a vinyl group introduced into the terminal or side chain thereof with hydrodienesiloxane using a platinum catalyst to cure. At this time, it is more preferable to use a resin that can be cured at 120 ° C. within 30 seconds because processing at a low temperature is possible.
- low temperature addition curing type LTC1006L, LTC1056L, LTC300B, LTC303E, LTC310, LTC314, LTC350G, LTC450A, LTC371G, LTC750A, LTC755A, LTC85A, L85 type, UV85B, LTC760A, etc.
- a silicone resin of the condensation reaction system for example, a polydimethylsiloxane having an OH group at the end and a polydimethylsiloxane having an H group at the end are subjected to a condensation reaction using an organotin catalyst to form a three-dimensional crosslinked structure.
- organotin catalyst for example, a polydimethylsiloxane having an OH group at the end and a polydimethylsiloxane having an H group at the end are subjected to a condensation reaction using an organotin catalyst to form a three-dimensional crosslinked structure.
- UV curable silicone resins include those that use the same radical reaction as ordinary silicone rubber crosslinks as the most basic types, those that introduce photopolymerization by introducing unsaturated groups, and those that decompose onium salts with UV light. Examples include those that generate a strong acid and then cleave the epoxy group to crosslink, and those that crosslink by the addition reaction of thiol to vinylsiloxane. Further, an electron beam can be used instead of the ultraviolet rays. Electron beams have stronger energy than ultraviolet rays, and can use a radical crosslinking reaction without using an initiator as in the case of ultraviolet curing. Examples of the resin used include UV curable silicones manufactured by Shin-Etsu Chemical Co., Ltd.
- UV-curable silicone resin acrylate-modified or glycidoxy-modified polydimethylsiloxane can also be used. Mixing these modified polydimethylsiloxanes with polyfunctional acrylate resins or epoxy resins and using them in the presence of an initiator can also provide good release performance.
- stearyl-modified, lauryl-modified alkyd resins acrylic resins, alkyd resins obtained by reaction of methylated melamine, acrylic resins, and the like are also suitable.
- Examples of the aminoalkyd resin obtained by the reaction of methylated melamine include Tesfine 303, Tesfine 305, Tesfine 314 and the like manufactured by Hitachi Chemical Co., Ltd.
- Examples of the aminoacrylic resin obtained by the reaction of methylated melamine include Tesfine 322 manufactured by Hitachi Chemical Co., Ltd.
- one type may be used, or two or more types may be mixed and used.
- additives such as a light peeling additive and a heavy peeling additive.
- the release coating layer of the present invention can contain particles having a particle size of 1 ⁇ m or less. However, it is preferable not to substantially contain those that form protrusions such as particles from the viewpoint of pinhole generation.
- an additive such as an adhesion improver or an antistatic agent may be added.
- the polyester film surface is subjected to pretreatment such as anchor coating, corona treatment, plasma treatment, atmospheric pressure plasma treatment, etc. before providing the release coating layer.
- the thickness of the release coating layer may be set according to the purpose of use, and is not particularly limited.
- the thickness of the release coating layer after curing is preferably in the range of 0.005 to 2 ⁇ m. Good.
- the thickness of the release coating layer is 0.005 ⁇ m or more, the peeling performance is maintained, which is preferable.
- the thickness of the release coating layer is 2 ⁇ m or less because the curing time does not become too long and there is no possibility of uneven thickness of the ceramic green sheet due to a decrease in the flatness of the release film.
- the resin constituting the release coating layer does not have a possibility of agglomeration and there is no possibility of forming protrusions.
- the outer surface of the film on which the release coating layer is formed (the surface of the release coating layer of the entire coating film that is not in contact with the polyester film) is flat so as not to cause defects in the ceramic green sheet applied and molded thereon. It is desirable that the area surface average roughness (Sa) is 5 nm or less and the maximum protrusion height (P) is 30 nm or less. Furthermore, it is more preferable that the area surface average roughness (Sa) is 5 nm or less and the maximum protrusion height (P) is 20 nm or less. Particularly preferably, the area surface average roughness (Sa) is 3 nm or less and the maximum protrusion height (P) is 17 nm or less.
- the area surface roughness (Sa) is 5 nm or less and the maximum protrusion height (P) is 30 nm or less, there is no occurrence of defects such as pinholes when forming the ceramic green sheet, and the yield is favorable. It can be said that the smaller the surface average surface roughness (Sa), the better, but it may be 0.1 nm or more, or 0.3 nm or more. It can be said that the smaller the maximum protrusion height (P) is, the better, but it may be 1 nm or more, or 3 nm or more.
- the PET film in order to adjust the film surface on which the release coating layer is formed to a predetermined roughness range, it is preferable that the PET film does not substantially contain particles.
- substantially free of particles means, for both the base film and the release coating layer, for example, in the case of inorganic particles, quantitative analysis of elements derived from the particles by fluorescent X-ray analysis. Is defined as 50 ppm or less, preferably 10 ppm or less, and most preferably below the detection limit. This means that even if particles are not actively added to the base film, contaminants derived from foreign substances and raw material resin or dirt adhering to the line or equipment in the film manufacturing process will be peeled off and mixed into the film. It is because there is a case to do.
- the method for forming the release coating layer is not particularly limited, and a coating solution in which a release resin is dissolved or dispersed is spread on one surface of the polyester film of the substrate by coating or the like, Etc. are removed by drying, followed by heat drying, heat curing or ultraviolet curing.
- the drying temperature at the time of solvent drying and thermosetting is preferably 180 ° C. or less, more preferably 150 ° C. or less, and most preferably 120 ° C. or less.
- the heating time is preferably 30 seconds or less, and more preferably 20 seconds or less.
- the temperature is 180 ° C. or lower, the flatness of the film is maintained, and there is little possibility of causing uneven thickness of the ceramic green sheet.
- the temperature is 120 ° C. or less, the film can be processed without impairing the flatness of the film, and the possibility of causing uneven thickness of the ceramic green sheet is further reduced, which is particularly preferable.
- the surface tension of the coating liquid when applying the release coating layer is not particularly limited, but is preferably 30 mN / m or less.
- the coating liquid for applying the release coating layer is not particularly limited, but it is preferable to add a solvent having a boiling point of 90 ° C. or higher.
- a solvent having a boiling point of 90 ° C. or higher By adding a solvent having a boiling point of 90 ° C. or higher, bumping at the time of drying can be prevented, the coating film can be leveled, and the smoothness of the coating film surface after drying can be improved.
- the addition amount is preferably about 10 to 80% by mass with respect to the whole coating solution.
- any known coating method can be applied, for example, a roll coating method such as a gravure coating method or a reverse coating method, a bar coating method such as a wire bar, a die coating method, a spray coating method, an air knife. Conventionally known methods such as a coating method can be used.
- a multilayer ceramic capacitor has a rectangular parallelepiped ceramic body.
- first internal electrodes and second internal electrodes are alternately provided along the thickness direction.
- the first internal electrode is exposed at the first end face of the ceramic body.
- a first external electrode is provided on the first end face.
- the first internal electrode is electrically connected to the first external electrode at the first end face.
- the second internal electrode is exposed at the second end face of the ceramic body.
- a second external electrode is provided on the second end face.
- the second internal electrode is electrically connected to the second external electrode at the second end face.
- the release film for producing a ceramic green sheet of the present invention is used for producing such a multilayer ceramic capacitor.
- it is manufactured as follows. First, the release film of the present invention is used as a carrier film, and a ceramic slurry for constituting a ceramic body is applied and dried. A conductive layer for forming the first or second internal electrode is printed on the coated and dried ceramic green sheet. A ceramic green sheet, a ceramic green sheet printed with a conductive layer for constituting the first internal electrode, and a ceramic green sheet printed with a conductive layer for constituting the second internal electrode are appropriately laminated and pressed. Thus, a mother laminate is obtained. The mother laminated body is divided into a plurality of parts to produce a raw ceramic body. A ceramic body is obtained by firing a raw ceramic body. Thereafter, the multilayer ceramic capacitor can be completed by forming the first and second external electrodes.
- PET polyethylene terephthalate pellets
- esterification reaction apparatus a continuous esterification reaction apparatus comprising a three-stage complete mixing tank having a stirrer, a partial condenser, a raw material charging port and a product outlet was used.
- TPA terephthalic acid
- EG ethylene glycol
- antimony trioxide is made into an amount that makes Sb atoms 160 ppm with respect to the produced PET, and these slurries are esterified.
- the reaction product in the first esterification reaction can is continuously taken out of the system and supplied to the second esterification reaction can, and is distilled off from the first esterification reaction can in the second esterification reaction can.
- An EG solution containing a quantity of TMPA (trimethyl phosphate) was added and reacted at 260 ° C. at normal pressure for an average residence time of 1 hour.
- the reaction product of the second esterification reaction can was continuously taken out of the system and supplied to the third esterification reaction can, and 39 MPa (400 kg / cm 2 ) using a high pressure disperser (manufactured by Nippon Seiki Co., Ltd.).
- the esterification reaction product produced in the third esterification reaction can was continuously supplied to a three-stage continuous polycondensation reaction apparatus to perform polycondensation, and sintered with a stainless steel fiber having a 95% cut diameter of 20 ⁇ m. After filtering with a filter, ultrafiltration was performed and extruded into water, and after cooling, it was cut into chips to obtain PET chips with an intrinsic viscosity of 0.60 dl / g (hereinafter referred to as PET (I)). .
- PET (I) intrinsic viscosity of 0.60 dl / g
- PET (II) Preparation of polyethylene terephthalate pellets (PET (II))
- PET (II) a PET chip having an intrinsic viscosity of 0.62 dl / g containing no particles such as calcium carbonate and silica was obtained (hereinafter abbreviated as PET (II)).
- copolyester resin (A-1) was light yellow and transparent.
- the reduced viscosity of the copolyester resin (A-1) was measured and found to be 0.60 dl / g.
- the glass transition temperature by DSC was 65 ° C.
- polyester aqueous dispersion Aw-1 (Production of polyester aqueous dispersion Aw-1)
- a reactor equipped with a stirrer, a thermometer and a reflux device 30 parts by mass of polyester resin (A-1) and 15 parts by mass of ethylene glycol-n-butyl ether were heated and stirred at 110 ° C. to dissolve the resin. After the resin was completely dissolved, 55 parts by mass of water was gradually added to the polyester solution while stirring. After the addition, the solution was cooled to room temperature while stirring to prepare a milky white polyester aqueous dispersion (Aw-1) having a solid content of 30% by mass.
- hydrophobic copolyester resin (A-2) was light yellow and transparent.
- polyester water dispersion Aw-2 (Production of polyester water dispersion Aw-2) Subsequently, 60 parts by mass of this copolymerized polyester resin (A-2), 45 parts by mass of methyl ethyl ketone and 15 parts by mass of isopropyl alcohol were added to a reactor equipped with a stirrer, a thermometer, a reflux apparatus and a quantitative dropping apparatus. The mixture was heated and stirred at 65 ° C. to dissolve the resin. After the resin was completely dissolved, 24 parts by weight of maleic anhydride was added to the polyester solution.
- polyester-based graft copolymer dispersion (Aw-2) was prepared.
- the obtained polyester-based graft copolymer had a glass transition temperature of 68 ° C.
- Acrylic particles B-5 Acrylic particle water dispersion (product of Nippon Shokubai, trade name MX100W, average particle size 150 nm, solid content concentration 10% by mass)
- Example 1 (Adjustment of easy-slip coating solution 1) Easy-slip coating solution 1 having the following composition was prepared.
- PET resin pellets PET (II)
- PET resin pellets PET (II)
- the unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 3.5 times in the longitudinal direction with a roll group having a difference in peripheral speed to obtain a uniaxially stretched PET film.
- the above easy-to-slip coating solution was applied to one side of a PET film with a bar coater, and then dried at 80 ° C. for 15 seconds.
- the coating amount after final stretching and drying was adjusted to 0.1 ⁇ m.
- the film was stretched 4.0 times in the width direction at 150 ° C. with a tenter, and heated at 230 ° C. for 0.5 seconds with the length in the width direction fixed, and further at 230 ° C. for 10 seconds. % In the width direction, and an in-line coated polyester film having a thickness of 31 ⁇ m was obtained.
- Example 2 Other than using the easy-to-slip coating solution 2 in which the silica particles B-3 in the easy-to-slip coating solution 1 used in Example 1 were changed to silica particles B-4 (average particle size 450 nm, solid content concentration 40% by mass). Obtained a release film for producing an ultrathin ceramic green sheet in the same manner as in Example 1.
- Example 3 A release film for producing an ultra-thin ceramic green sheet was obtained in the same manner as in Example 1 except that the easy-slip coating solution 1 was changed to the following easy-slip coating solution 3.
- (Easy-slip coating solution 3) Water 47.43 parts by weight Isopropyl alcohol 35.00 parts by weight Polyester water dispersion Aw-1 14.92 parts by weight (solid content concentration 30% by weight) Silica particle B-1 2.24 parts by mass (average particle size 40 nm, solid content concentration 20% by mass) Silica particle B-4 0.11 part by mass (average particle size 450 nm, solid content concentration 40% by mass) Surfactant (fluorine-based, solid content concentration 10% by mass) 0.30 parts by mass
- Example 4 A polyester film was obtained in the same manner as in Example 1 except that the easy-to-slip coating liquid 1 was changed to the following easy-to-slip coating liquid 4.
- (Easy-slip coating solution 4) Water 48.54 parts by weight Isopropyl alcohol 35.00 parts by weight Polyester water dispersion Aw-1 14.92 parts by weight (solid content concentration 30% by weight) Silica particle B-2 1.12 parts by mass (average particle size 100 nm, solid content concentration 40% by mass) Silica particle B-4 0.11 part by mass (average particle size 450 nm, solid content concentration 40% by mass) Surfactant (fluorine-based, solid content concentration 10% by mass) 0.30 parts by mass
- Example 5 A polyester film was obtained in the same manner as in Example 1 except that the slippery coating liquid 1 was changed to the slippery coating liquid 5 described below.
- (Easy-slip coating solution 5) Water 45.18 parts by weight Isopropyl alcohol 35.00 parts by weight Polyester water dispersion Aw-2 18.93 parts by weight (solid content concentration 25% by weight) Silica particle B-3 0.59 parts by mass (average particle size 200 nm, solid content concentration 40% by mass) Surfactant (fluorine-based, solid content concentration 10% by mass) 0.30 parts by mass
- Example 6 A polyester film was obtained in the same manner as in Example 1 except that the easy-slip coating solution 1 was changed to the following easy-slip coating solution 6.
- Easy-slip coating solution 6 Water 51.32 parts by weight Isopropyl alcohol 35.00 parts by weight Polyurethane resin water dispersion Aw-3 12.79 parts by weight (solid content concentration 37% by weight) Silica particle B-3 0.59 parts by mass (average particle size 200 nm, solid content concentration 40% by mass) Surfactant (fluorine-based, solid content concentration 10% by mass) 0.30 parts by mass
- Example 7 A release film for producing an ultrathin ceramic green sheet was obtained in the same manner as in Example 1 except that the release coating layer was formed as described below.
- the release agent solution X-2 was applied to the surface layer (a) opposite to the slippery coating layer with a reverse gravure coater so that the thickness after drying was 0.1 ⁇ m. Then, a release coating layer was formed by drying with hot air at 130 ° C. for 30 seconds to obtain a release film for producing an ultrathin layer ceramic green sheet.
- Example 8 A polyester film was obtained in the same manner as in Example 1 except that the easy-to-slip coating liquid 1 was changed to the following easy-to-slip coating liquid 8.
- (Easy-slip coating solution 8) Water 46.56 parts by weight Isopropyl alcohol 35.00 parts by weight Polyester water dispersion Aw-1 15.78 parts by weight (solid content concentration 30% by weight) Acrylic particle B-5 2.37 parts by mass (average particle size 150 nm, solid content concentration 10% by mass) Surfactant (fluorine-based, solid content concentration 10% by mass) 0.30 parts by mass
- Example 1 As the film for forming the mold release coating layer, it was carried out except that it was changed to E5000-25 ⁇ m (manufactured by Toyobo Co., Ltd.) instead of the inline coating film having the slippery coating layer on one surface prepared in Example 1. A release film for producing a ceramic green sheet was obtained in the same manner as in Example 1. E5000 contained particles inside the film, and Sa on both surfaces was 0.031 ⁇ m.
- Comparative Example 2 A release film for producing a ceramic green sheet was obtained in the same manner as in Comparative Example 1, except that the coating thickness of the release layer was changed to 1.0 ⁇ m.
- Example 3 As a film for forming the release coating layer, instead of the inline coating film having an easy-to-slip coating layer on one surface prepared in Example 1, it is used by changing to the laminated film Z, and contains the lubricant of the film Z. A release film for producing a ceramic green sheet was obtained in the same manner as in Example 1 except that a release coating layer was formed on the non-side surface.
- Comparative Example 4 Reverse gravure so that the thickness of the back surface smoothing coating liquid Y is 0.5 ⁇ m after drying on the surface opposite to the surface on which the release coating layer of the release film for producing the ceramic green sheet obtained in Comparative Example 3 is formed. After coating with a coater and then drying with hot air at 90 ° C. for 30 seconds, UV irradiation (300 mJ / cm 2 ) is immediately performed with an electrodeless lamp (H bulb manufactured by Fusion Corporation) to form a back smoothing layer. Thus, a release film for producing a ceramic green sheet was obtained.
- Table 1 shows the evaluation results of each example and comparative example.
- the winding property of each Example, the process passing property, and the handling property were excellent as in Example 1 without any particular problems.
- ADVANTAGE OF THE INVENTION even when a ceramic green sheet is made into a thin film, it is possible to provide a release film for producing a ceramic green sheet that can achieve both good winding properties and prevention of pinholes and partial thickness variations. Is possible. Further, by using the release film for producing a ceramic green sheet of the present invention, an extremely thin ceramic green sheet can be obtained, and a minute ceramic capacitor can be produced efficiently.
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