WO2014109340A1 - 離型フィルムおよびその製造方法 - Google Patents
離型フィルムおよびその製造方法 Download PDFInfo
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- WO2014109340A1 WO2014109340A1 PCT/JP2014/050173 JP2014050173W WO2014109340A1 WO 2014109340 A1 WO2014109340 A1 WO 2014109340A1 JP 2014050173 W JP2014050173 W JP 2014050173W WO 2014109340 A1 WO2014109340 A1 WO 2014109340A1
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- acid
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- resin
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- 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
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- 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
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- 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
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2867/00—Use of polyesters or derivatives thereof as mould material
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- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0098—Peel strength; Peelability
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
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- B29L2009/005—Layered products coated
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- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- B32B2255/26—Polymeric coating
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
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- B32B2264/02—Synthetic macromolecular particles
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- B32B2264/025—Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- C—CHEMISTRY; METALLURGY
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to a release film suitable as a release material.
- Release films are widely used in the industrial field, and specific applications include process materials for manufacturing printed wiring boards, flexible printed wiring boards, multilayer printed wiring boards, adhesive materials, liquid crystal display parts, etc. Examples include protective materials, molding materials for sheet-like structures such as ion exchange membranes and ceramic green sheets.
- a release film obtained by forming the resin having releasability into a film becomes expensive. Therefore, in the production of a release film, a film made of an inexpensive resin is used as a base film, and the surface of the base film is coated with a resin having a release property, and a resin layer having a release property. Many methods have been proposed for laminating layers. And the polyester film represented by the polyethylene terephthalate which has the outstanding mechanical characteristic, heat resistance, and chemical resistance is used for the base film.
- the method of coating the base film surface with a resin having releasability and laminating the resin layer is an effective method in terms of thinning the resin layer.
- an aqueous release coating agent is used.
- a method of laminating a silicone resin (Patent Documents 1 and 2) and a method of laminating a fluorine-containing resin (Patent Document 3) are disclosed.
- the resin layers described in Patent Documents 1 and 2 have poor adhesion to the base material, and when the adherend is peeled off, the resin having these releasability is transferred to the adherend, There is a problem of lowering the function, for example, adhesiveness.
- Patent Document 3 the resin described in Patent Document 3 is expensive, and has a problem that it is difficult to burn in a waste incineration process after use and generates toxic gas. In addition, there is a problem that a large amount of an organic solvent is used to uniformly coat a resin having releasability.
- Patent Documents 4 to 7 there is a resin layer containing an acid-modified polyolefin resin as a resin layer that has little risk of contaminating an adherend, has both smoothness and releasability, and does not deteriorate processability. It is disclosed.
- the resin layers described in Patent Documents 4 to 7 are excellent in releasability from an acrylic adherend. However, depending on the composition, the resin layers described in Patent Documents 4 to 7 may have poor releasability from other adherends, particularly rubber-based adherends. In some cases, the adherend is limited, for example, an unexpected unnecessary pattern is formed on the surface of the adherend after peeling and a good surface cannot be obtained.
- An object of the present invention is to release such a problem, and is a release film in which a resin layer containing an acid-modified polyolefin resin is provided on one surface of a polyester film, and has a good release property to a rubber-based adherend. It is another object of the present invention to provide a release film in which the opposite surface of the surface provided with the resin layer is not contaminated even when rolled.
- the present inventors have conducted extensive studies, and a step of applying a liquid material for forming a resin layer to a polyester film, and drying the polyester film to which the liquid material has been applied, The inventors have found that the above-mentioned problems can be solved by including the steps of stretching and heat treatment in the processing step of the release film, and have reached the present invention.
- the gist of the present invention is as follows.
- the resin layer contains an acid-modified polyolefin resin in which the ratio of the acid-modified component is 1 to 10% by mass, polyvinyl alcohol, and a crosslinking agent.
- the content of polyvinyl alcohol is more than 200 parts by mass and 1000 parts by mass or less
- the content of the crosslinking agent is 1 to 20 parts by mass
- a release film characterized by having a peeling force between a resin layer and an adherend of 0.5 N / cm or less when measured by attaching a rubber adherend to the resin layer.
- a method for producing the release film as described in (1) above wherein the acid-modified polyolefin resin in which the ratio of the acid-modified component is 1 to 10% by mass, polyvinyl alcohol, a crosslinking agent, The content of polyvinyl alcohol is more than 200 parts by weight and not more than 1000 parts by weight, and the content of the crosslinking agent is 1 to 20 parts by weight with respect to 100 parts by weight of the acid-modified polyolefin resin.
- a method for producing a release film comprising a step of applying a liquid to a polyester film, and a step of drying, stretching and heat-treating the polyester film to which the liquid is applied.
- the release film of the present invention has good releasability with respect to the rubber-based adherend, and even when wound in a roll shape, the surface opposite to the surface provided with the resin layer is not contaminated.
- release agents such as waxes, low molecular weight silicone compounds, and surfactants are not required. For this reason, the adherend is not contaminated during peeling.
- a release agent containing a halogen element such as fluorine, the burden on the environment during disposal is small.
- the release film of the present invention can be used as a process material for manufacturing printed wiring boards, protective materials such as adhesive materials and liquid crystal display parts, and molding materials for sheet-like structures such as ion exchange membranes and ceramic green sheets. Is preferred.
- a resin layer is provided on one surface of a polyester film as a substrate, and the resin layer contains an acid-modified polyolefin resin, polyvinyl alcohol, and a crosslinking agent.
- the polyester constituting the polyester film is a linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof.
- a linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof.
- polyester include polyethylene terephthalate, polyethylene isophthalate, polytetramethylene terephthalate, poly (1,4-cyclohexylenedimethylene terephthalate), polyethylene-2,6-naphthalate and other polyesters, Coalesce is mentioned.
- the component that can constitute the copolymer is not particularly limited, and the acid component is isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, oxalic acid, succinic acid, adipic acid. , Sebacic acid, azelaic acid, dodecanedioic acid, dimer acid, maleic anhydride, maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, cyclohexanedicarboxylic acid and other dicarboxylic acids, 4-hydroxybenzoic acid, ⁇ -caprolactone And lactic acid.
- ethylene glycol diethylene glycol, 1,3-propanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanedimethanol, triethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, bisphenol Examples thereof include ethylene oxide adducts of A and bisphenol S.
- a small amount of trifunctional compounds such as trimellitic acid, trimesic acid, pyromellitic acid, trimethylolpropane, glycerin, pentaerythritol, and the like may be used. Two or more of these copolymer components may be used in combination. Two or more kinds of polyesters may be blended and used.
- the polyester is particularly preferably polyethylene terephthalate or polyethylene-2,6-naphthalate.
- the intrinsic viscosity of the polyester is preferably 0.55 to 0.80, and more preferably 0.60 to 0.75.
- the intrinsic viscosity is less than the above range, cutting is likely to occur during film formation, and it is difficult to produce stably, and the strength of the obtained film is low.
- the intrinsic viscosity exceeds the above range, in the film production process, shear heat generation becomes large at the time of melt extrusion of the resin, the load on the extruder increases, and the production speed must be sacrificed, The thickness of the film becomes difficult to control, and the productivity of the film decreases.
- thermal decomposition and gelation increase, and surface defects, foreign matters, and surface coarse protrusions increase.
- the intrinsic viscosity is too high, the polymerization time and the polymerization process are long, which increases the cost.
- the polymerization method of polyester is not particularly limited, and examples thereof include a transesterification method and a direct polymerization method.
- the transesterification catalyst include oxides such as Mg, Mn, Zn, Ca, Li, and Ti, and compounds such as acetates.
- the polycondensation catalyst include oxides such as Sb, Ti, and Ge, and compounds such as acetate. Since the polyester after polymerization contains monomers, oligomers, by-product acetaldehyde and the like, it is preferable to remove these by solid-phase polymerization at a temperature of 200 ° C. or higher under reduced pressure or inert gas flow.
- additives such as an antioxidant, a heat stabilizer, an ultraviolet absorber, an antistatic agent, and a pinning agent can be added as necessary.
- Antioxidants include hindered phenol compounds, hindered amine compounds, etc.
- thermal stabilizers include phosphorus compounds
- ultraviolet absorbers include benzophenone compounds, benzotriazole compounds, and the like.
- a roughening substance may be contained in the polyester, and the maximum particle diameter of the roughening substance is preferably 0.2 ⁇ m or less.
- the roughening substance examples include inorganic particles such as silicon dioxide, calcium carbonate, kaolinite, titanium dioxide, and silica alumina, and organic particles such as silicone, polymethyl methacrylate, and ethyl vinylbenzene.
- a roughening substance can be used individually or in combination of 2 or more types.
- the release film of the present invention uses a polyester film composed of the polyester as a base film.
- a polyester film composed of the polyester as a base film.
- an example of the manufacturing method of a polyester film is demonstrated concretely.
- fully dried polyester is supplied to an extruder, fully plasticized, melted at a temperature that exhibits fluidity, passed through a filter selected as necessary, and then passed through a T die to form a sheet. Extrude into. This sheet is brought into close contact with a cooling drum whose temperature is adjusted to be equal to or lower than the glass transition temperature (Tg) of the polyester to obtain an unstretched film.
- Tg glass transition temperature
- the obtained unstretched film is uniaxially oriented by a uniaxial stretching method or biaxially oriented by a biaxial stretching method.
- the biaxial stretching method is not particularly limited, but a sequential biaxial stretching method or a simultaneous biaxial stretching method can be used.
- an unstretched film is stretched so as to have a stretching ratio of about 2 to 6 times in the longitudinal or width direction within a temperature range of 50 ° C. higher than Tg to Tg of polyester.
- an unstretched film is biaxially stretched so as to have a stretching ratio of about 2 to 4 times in the longitudinal and width directions within a temperature range 50 ° C. higher than Tg to Tg of polyester.
- preliminary longitudinal stretching up to about 1.2 times may be performed on the unstretched film.
- an unstretched film is heated with a heating roll or infrared rays and stretched in the longitudinal direction to obtain a longitudinally stretched film.
- Stretching is preferably performed 2.5 to 4.0 times in a temperature range 40 ° C. higher than Tg to Tg of polyester by utilizing a difference in peripheral speed between two or more rolls.
- the longitudinally stretched film is continuously subjected to transverse stretching, heat setting, and thermal relaxation in the width direction to form a biaxially oriented film.
- the transverse stretching is started at a temperature 40 ° C. higher than Tg to Tg of the polyester, and the maximum temperature is preferably (100 to 40) ° C. lower than the melting point (Tm) of the polyester.
- the transverse stretching ratio is adjusted depending on the required physical properties of the final film, but is preferably 3.5 times or more, more preferably 3.8 times or more, and more preferably 4.0 times or more. .
- the elastic modulus of the film and the dimensional stability can be enhanced.
- a heat setting treatment for several seconds at a temperature (50 to 10) ° C. lower than the Tm of the polyester and a relaxation of 1 to 10% in the film width direction simultaneously with the heat setting treatment.
- the film is cooled to Tg or less of the film to obtain a biaxially stretched film.
- a single-layer film can be obtained by the above production method.
- the polyester film is preferably a multilayer film composed of two types of layers in order to improve handling while realizing high smoothness, and more than two types of layers.
- a multilayer film formed by laminating may be used.
- the layer in which a resin layer is provided among the outer layers of a multilayer film does not contain the said roughening substance. By not including a roughening material in the layer provided with the resin layer, the surface roughness of the layer provided with the resin layer is reduced.
- the multilayer film is obtained by separately melting the polyester constituting each layer, extruding using a multilayer die, laminating and fusing before solidification, biaxial stretching, and heat-setting. Two or more kinds of polyesters can be separately melted and extruded to form a film, which can be produced by a method of laminating and fusing them in an unstretched state or after stretching. From the simplicity of the process, it is preferable to use a multilayer die and laminate and fuse before solidification.
- the release film of the present invention is one in which a resin layer is provided on one surface of the above polyester film, and the resin layer contains an acid-modified polyolefin resin, polyvinyl alcohol, and a crosslinking agent.
- the acid-modified polyolefin resin contained in the resin layer is a resin having an olefin component as a main component and modified with an acid-modified component.
- the olefin component constituting the acid-modified polyolefin resin preferably contains ethylene and / or propylene, and may further contain butene.
- Examples of the acid-modifying component constituting the acid-modified polyolefin resin include unsaturated carboxylic acid components. Specifically, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, fumaric acid, In addition to crotonic acid and the like, unsaturated dicarboxylic acid half esters, half amides and the like can be mentioned. Among them, acrylic acid, methacrylic acid, maleic acid, and maleic anhydride are preferable, and acrylic acid, methacrylic acid, and maleic anhydride are particularly preferable in order to stably disperse the resin in the aqueous dispersion of the resin that will be described later. Two or more of these acid-modified components may be contained in the acid-modified polyolefin resin.
- the ratio of the acid-modified component in the acid-modified polyolefin resin is required to be 1 to 10% by mass, and preferably 2 to 9% by mass. If the acid-modified component is less than 1%, the proportion of polar groups in the acid-modified polyolefin resin contained in the resin layer is reduced, so that sufficient adhesion with the polyester film cannot be obtained, and the adherend is contaminated. Sometimes. Furthermore, in the aqueous dispersion of the resin described later, it tends to be difficult to stably disperse the resin.
- acid-modified polyolefin resin contains the ethylenically unsaturated component which contains an oxygen atom in a side chain from the reason which improves adhesiveness with a polyester film further.
- the ethylenically unsaturated component containing an oxygen atom in the side chain include esterified products of (meth) acrylic acid and alcohols having 1 to 30 carbon atoms. Among these, (meth) acrylic is easy to obtain. An esterified product of an acid and an alcohol having 1 to 20 carbon atoms is preferable.
- Such compounds include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, (meth) acrylic acid.
- examples include octyl, decyl (meth) acrylate, lauryl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate, and the like. Mixtures of these may be used.
- methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hexyl acrylate, octyl acrylate are more preferable, ethyl acrylate, More preferred is butyl acrylate, and particularly preferred is ethyl acrylate.
- “(Meth) acrylic acid” means “acrylic acid or methacrylic acid”.
- the ethylenically unsaturated component containing an oxygen atom in the side chain has a polar group in the molecule, like the acid-modified component.
- the adhesiveness with a polyester film becomes high by including the ethylenically unsaturated component containing an oxygen atom in the side chain in the acid-modified polyolefin resin.
- the ratio of the ethylenically unsaturated component containing an oxygen atom in the side chain in the acid-modified polyolefin resin is preferably 1 to 40% by mass, more preferably 2 to 35% by mass, and 3 to 30% by mass.
- the acid-modified polyolefin resin may be copolymerized with a small amount of other monomers.
- other monomers include dienes, (meth) acrylonitrile, vinyl halides, vinylidene halides, carbon monoxide, sulfur dioxide, and the like.
- Each component constituting the acid-modified polyolefin resin may be copolymerized in the acid-modified polyolefin resin, and the form is not limited.
- Examples of the state of copolymerization include random copolymerization, block copolymerization, and graft copolymerization (graft modification).
- the melting point of the acid-modified polyolefin resin is preferably 80 to 200 ° C, more preferably 90 to 150 ° C.
- fusing point exceeds 200 degreeC, a high temperature process may be needed at the time of resin layer formation to the polyester film surface.
- the melting point is less than 80 ° C., the releasability is lowered.
- the Vicat softening point of the acid-modified polyolefin resin is preferably 50 to 180 ° C, more preferably 53 to 120 ° C, and further preferably 55 to 110 ° C.
- the Vicat softening point is less than 50 ° C., the resin layer formed on the polyester film is easily melted, so that the adhesion to the adherend is increased and the releasability is lowered.
- it exceeds 180 degreeC the process under high temperature is needed at the time of resin layer formation to the polyester film surface.
- the melt flow rate (MFR) of the acid-modified polyolefin resin is preferably 1 to 1000 g / 10 minutes at 190 ° C. and 2160 g load, more preferably 1 to 500 g / 10 minutes, and 1 to 100 g / 10 minutes. More preferably.
- MFR melt flow rate
- the melt flow rate is less than 1 g / 10 min, it becomes difficult to produce an aqueous dispersion having excellent dispersion stability, which will be described later.
- the melt flow rate exceeds 1000 g / 10 min, the adhesion between the resin layer and the polyester film may be lowered.
- Examples of the acid-modified polyolefin resin that can be used in the present invention include “AN42115C”, “N1050H”, “N1110H” of Nuclel series, which are acid-modified polyolefin resins manufactured by Mitsui DuPont Polychemical Co., Ltd. Products such as “A210K” of the Lexpearl series which is an acid-modified polyethylene resin, “Yumex 1001” manufactured by Sanyo Kasei Co., Ltd., and the like.
- Examples of the acid-modified polyolefin resin containing an ethylenically unsaturated component containing an oxygen atom in the side chain include “LX-4110” and “HX-8210” of Bondine series maleic anhydride-modified polyolefin resins manufactured by Arkema. , “HX-8290”, “TX-8030” and the like.
- the resin layer needs to contain polyvinyl alcohol together with the acid-modified polyolefin resin.
- polyvinyl alcohol is dispersed in the acid-modified polyolefin resin, thereby improving the releasability of the acid-modified polyolefin resin and the crosslinking agent and at the same time exhibiting adhesion to the polyester film of the polyvinyl alcohol itself. can do.
- the kind of polyvinyl alcohol is not particularly limited, and examples thereof include a completely or partially saponified vinyl ester polymer.
- the polyvinyl alcohol preferably has water solubility for use as a liquid as described later.
- the average degree of polymerization of polyvinyl alcohol is not particularly limited, and is, for example, 300 to 5,000. From the viewpoint of improving the stability of the liquid material for forming the resin layer, it is 300 to 2,000. Preferably there is.
- the content of polyvinyl alcohol needs to be more than 200 parts by mass and 1000 parts by mass or less with respect to 100 parts by mass of the acid-modified polyolefin resin.
- the amount is less than 200 parts by mass, the releasability with respect to the rubber-based adherend tends to be poor.
- the amount exceeds 1000 parts by mass, the viscosity of the liquid material for forming the resin layer increases and uneven coating tends to occur.
- a gel may be formed.
- the content of polyvinyl alcohol is preferably 210 to 500 parts by mass, and more preferably 300 to 400 parts by mass.
- a commercially available polyvinyl alcohol can be used.
- JC-05 “JC-05”, “VC-10”, “ASC-05X” of “J-Poval” manufactured by Nippon Vinegar Poval Corporation, “UMR-10HH”; “PVA-103” and “PVA-105” of “Kuraray Poval” manufactured by Kuraray Co., Ltd. “AQ4104” and “HR3010” of “Exceal”; “Denka Poval” manufactured by Denki Kagaku Kogyo Co., Ltd. "PC-1000”, “PC-2000” and the like.
- the resin layer needs to contain a crosslinking agent together with the acid-modified polyolefin resin and polyvinyl alcohol.
- a crosslinking agent By including the crosslinking agent, the constituent components of the resin layer are crosslinked, and the cohesive force of the resin layer can be improved to make it difficult to migrate to the adherend, or the water resistance can be improved.
- the addition amount of the crosslinking agent is required to be 1 to 20 parts by weight, more preferably 2 to 15 parts by weight, with respect to 100 parts by weight of the acid-modified polyolefin resin. Is more preferable.
- the addition amount of the crosslinking agent is less than 1 part by mass, the cohesive force of the resin layer becomes weak and the resin layer easily moves to the adherend, and when it exceeds 20 parts by mass, the resin layer and the adherend Reaction may occur between them, and the release property may become poor.
- crosslinking agent a compound having a plurality of functional groups that react with a carboxyl group in the molecule can be used, among which an isocyanate compound, a melamine compound, a urea compound, an epoxy compound, a carbodiimide compound, an oxazoline compound, and the like are preferable.
- carbodiimide compounds and oxazoline compounds are effective.
- These crosslinking agents may be used in combination.
- the carbodiimide compound used as the crosslinking agent is not particularly limited as long as it has one or more carbodiimide groups in the molecule.
- the carbodiimide compound forms an ester with two carboxyl groups in the acid-modified part of the acid-modified polyolefin resin in one carbodiimide part to achieve crosslinking.
- carbodiimide compound examples include, for example, p-phenylene-bis (2,6-xylylcarbodiimide), tetramethylene-bis (t-butylcarbodiimide), cyclohexane-1,4-bis (methylene-t-butylcarbodiimide)
- carbodiimide group examples include compounds having a carbodiimide group such as polycarbodiimide which is a polymer having a carbodiimide group. These 1 type (s) or 2 or more types can be used.
- polycarbodiimide is preferable from the viewpoint of ease of handling.
- Examples of commercially available products of polycarbodiimide include the Carbodilite series manufactured by Nisshinbo Co., Ltd.
- water-soluble types “SV-02”, “V-02”, “V-02-L2”, “ Emulsion type “E-01”, “E-02”; Organic solution type “V-01”, “V-03”, “V-07”, “V-09”; Type “V-05”.
- the oxazoline compound used as the crosslinking agent is not particularly limited as long as it has two or more oxazoline groups in the molecule.
- the oxazoline compound forms an amide ester with one carboxyl group in the acid-modified portion of the acid-modified polyolefin resin in each of the two oxazoline portions to achieve crosslinking.
- Specific examples of the oxazoline compound include, for example, 2,2′-bis (2-oxazoline), 2,2′-ethylene-bis (4,4′-dimethyl-2-oxazoline), 2,2′-p-phenylene.
- Examples thereof include compounds having an oxazoline group such as bis (2-oxazoline) and bis (2-oxazolinylcyclohexane) sulfide, and polymers containing oxazoline. These 1 type (s) or 2 or more types can be used. Among these, an oxazoline group-containing polymer is preferable because of ease of handling.
- Commercially available products of the oxazoline group-containing polymer include EPOCROSS series manufactured by Nippon Shokubai Co., Ltd.
- the resin layer may contain a lubricant as long as the effects of the present invention are not impaired.
- a lubricant for example, calcium carbonate, magnesium carbonate, calcium oxide, zinc oxide, magnesium oxide, silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate, titanium oxide, tin oxide, antimony trioxide, Inorganic particles such as carbon black and molybdenum disulfide, organic particles such as acrylic cross-linked polymers, styrene cross-linked polymers, silicone resins, fluororesins, benzoguanamine resins, phenol resins, nylon resins, polyethylene wax, surfactants, etc. Is mentioned.
- the resin layer in the present invention contains a specific amount of polyvinyl alcohol and a cross-linking agent in addition to the acid-modified polyolefin resin, it has excellent separation properties for rubber-based adherends as well as acrylic-based adherends.
- the thickness of the resin layer is preferably 0.01 to 1 ⁇ m, more preferably 0.03 to 0.7 ⁇ m, and even more preferably 0.05 to 0.5 ⁇ m.
- the thickness of the resin layer is less than 0.01 ⁇ m, sufficient releasability cannot be obtained, and when it exceeds 1 ⁇ m, the releasability is not saturated and does not improve, but the cohesive force is reduced and the adherend is reduced. Easy to migrate.
- the resin layer preferably has a surface roughness SRz of 1.5 ⁇ m or less.
- SRz exceeds 1.5 ⁇ m, it may cause defects in the adherend and may not satisfy the requirements for a smooth film for release.
- the surface roughness SRz is a ten-point average roughness, which is the average of the absolute values of the heights of the five points from the highest peak to the fifth peak in the reference length section, and 5 from the deepest valley bottom. It is the sum of the absolute values of the depths of the five points at the bottom of the valley and represents the size of the unevenness in the height direction.
- the resin layer preferably has a surface roughness SRa of 30 nm or less.
- the surface roughness SRa is an average deviation of the roughness, and the height and depth of the peaks and valleys in the section of the reference length of the film surface with respect to the average value of the roughness curve in the section of a certain reference length. It is an average value of the absolute value of the roughness, and is an evaluation of roughness composed of the height and amount of the valley.
- the method for achieving the surface roughness is not particularly limited, it is desirable that the surface roughening substance is not substantially contained in the layer provided with the resin layer of the base polyester film. Substantially free means that no surface roughening material is intentionally added.
- the resin layer is formed by applying a liquid material containing an acid-modified polyolefin resin, polyvinyl alcohol and a crosslinking agent in a liquid medium to a polyester film, and drying and stretching the polyester film to which the liquid material has been applied. And it can form easily industrially by the method of heat-processing.
- the liquid medium constituting the resin layer-forming liquid material is preferably an aqueous medium.
- the aqueous medium means a solvent containing water and an amphiphilic organic solvent and having a water content of 2% by mass or more, and may be water alone.
- the amphiphilic organic solvent means an organic solvent having a water solubility of 5% by mass or more at 20 ° C. (For the solubility of water in an organic solvent at 20 ° C., for example, “Solvent Handbook” (Kodansha) (Scientific, 1990, 10th edition)).
- amphiphilic organic solvent examples include alcohols such as methanol, ethanol, n-propanol and isopropanol, ethers such as tetrahydrofuran and 1,4-dioxane, ketones such as acetone and methyl ethyl ketone, methyl acetate, acetic acid- Esters such as n-propyl, isopropyl acetate, methyl propionate, ethyl propionate, dimethyl carbonate, ethylene glycol derivatives such as ethylene glycol-n-butyl ether, and other substances including ammonia, diethylamine, triethylamine, diethanolamine, triethanolamine Organic amine compounds such as N, N-dimethylethanolamine and N, N-diethylethanolamine, and lactams such as 2-pyrrolidone and N-methyl-2-pyrrolidone.
- alcohols such as methanol, ethanol, n-propanol and isopropan
- the liquid for forming the resin layer can be prepared by adding polyvinyl alcohol or a crosslinking agent to the liquid of the acid-modified polyolefin resin.
- an aqueous dispersion of the acid-modified polyolefin resin can be used as the liquid material of the acid-modified polyolefin resin.
- the method for aqueous dispersion of the acid-modified polyolefin resin is not particularly limited, and examples thereof include the method described in WO 02/055598.
- the dispersed particle size of the acid-modified polyolefin resin in the aqueous medium preferably has a number average particle size of 1 ⁇ m or less from the viewpoint of stability when mixed with other components and storage stability after mixing.
- the solid content concentration of the aqueous dispersion of the acid-modified polyolefin resin is not particularly limited, but is preferably 1 to 60% by mass and 5 to 30% by mass in order to keep the viscosity of the aqueous dispersion moderate. More preferred.
- the solid content concentration of the liquid material for forming a resin layer obtained by mixing an aqueous dispersion of an acid-modified polyolefin resin, polyvinyl alcohol, and a crosslinking agent can be appropriately selected depending on the lamination conditions, the target thickness and performance, It is not particularly limited. However, in order to keep the viscosity of the liquid material moderate and to form a uniform resin layer, the content is preferably 2 to 30% by mass, and more preferably 3 to 20% by mass. Antioxidants, ultraviolet absorbers, lubricants, colorants, and the like can be added to the resin layer-forming liquid as long as the performance is not impaired.
- the liquid material for forming the resin layer is applied to the polyester film by a known method such as gravure roll coating, reverse roll coating, wire bar coating, lip coating, air knife coating, curtain flow coating, spraying. Examples thereof include coating, dip coating, and brushing.
- the resin layer can be formed in a state where the degree of orientation crystallization on the surface of the polyester film is small, so that the adhesion between the polyester film and the resin layer is improved.
- the resin layer can be heat-treated at a higher temperature while the polyester film is in tension, the releasability and the remaining adhesive force can be improved without degrading the quality of the polyester film.
- the liquid material is applied to a polyester film stretched in a uniaxial direction, the polyester film coated with the liquid material is dried, and then the polyester film is orthogonal to the direction. It is preferable that the film is further stretched and heat-treated in the direction to be used for reasons of simplicity and operation.
- the resin layer constituting the release film of the present invention does not cause contamination to the processing step and the adherend, and the resin layer is provided even when the release film of the present invention is wound into a roll.
- the opposite surface of the formed surface is not contaminated by the resin layer.
- the contact angle of the surface increases. That is, the contact angle of water on the surface of the base polyester film is 60 to 70 °, while the contact angle of the resin layer surface is 90 to 100 °, and the surface opposite to the surface on which the resin layer is provided is formed by the resin layer.
- the contact angle of the surface increases from 60-70 ° and approaches 90-100 °.
- the contact angle of water on the surface opposite to the surface on which the resin layer is provided should be 80 ° or less even when the release film is rolled up. Can do. If the contact angle on the opposite surface is 80 ° or less, it can be considered that the opposite surface of the film is not contaminated. If the contact angle exceeds 80 °, the opposite surface of the film is contaminated and the processing process is contaminated. There are concerns. Accordingly, when processing such as laminating is performed on the surface opposite to the surface on which the resin layer is provided, the contact angle of water on the opposite surface is preferably 80 ° or less, and more preferably 75 ° or less. preferable.
- the obtained release film was cut into a 10 cm square, attached to a paper tube having an outer diameter of 10.5 cm, and then the rubber-based adherence prepared by the following method.
- the body rubber layer was pasted so as to contact the resin layer of the release film.
- a polyester film (Unit-12, PET-12) was wound with a winding tension of 118 N / m, a winding contact pressure of 118 N / m, and a winding speed of 100 m / min. It left still in a hot air dryer.
- the film extruded from the T-die is sandwiched between a mat roll made of silicon rubber (support layer side) and a metal cooling roll (rubber layer side) whose average surface roughness is adjusted to 0.8 ⁇ m. I picked it up.
- a biaxially stretched polyethylene terephthalate film (“Embret S-16" manufactured by Unitika Co., Ltd.) having a thickness of 16 ⁇ m was used as a base material layer, and the support layer side surface of the two-layer film was laminated thereon as a laminated surface. Extrusion lamination was performed through low-density polyethylene to produce a rubber-based adherend (rubber layer / support layer / low-density polyethylene / base material layer).
- a polyester adhesive tape (Nitto Denko No. 31B / acrylic adhesive) having a width of 50 mm and a length of 150 mm is pressure-bonded to the resin layer side of the obtained release film with a rubber roll. And used as a sample.
- a sample is sandwiched in the form of a metal plate / rubber plate / sample / rubber plate / metal plate, left in a 2 kPa load, 70 ° C. atmosphere for 20 hours, then cooled to room temperature for 30 minutes or longer, and a sample for peel strength measurement Got.
- the peel strength between the adhesive tape and the release film of the peel strength measurement sample was measured with a tensile tester (precision universal material tester 2020 manufactured by Intesco) in a constant temperature room at 25 ° C.
- the peeling angle is 180 degrees and the peeling speed is 300 mm / min.
- An acid-modified polyolefin resin aqueous dispersion for preparing a liquid for forming a resin layer was produced by the following method.
- the rotation speed of the stirring blade was set to 300 rpm, the system temperature was maintained at 140 to 145 ° C., and stirring was performed for 60 minutes. Then, it put on the water bath and cooled to room temperature (about 25 degreeC), stirring with a rotational speed of 300 rpm. Thereafter, in order to remove the organic solvent from the aqueous medium, a part of the aqueous medium was distilled off at a bath temperature of 80 ° C. while adding water using a rotary evaporator. Then, after cooling to room temperature (25 ° C.) by air cooling, pressure filtration (air pressure 0.2 MPa) was performed with a 300-mesh stainless steel filter (wire diameter 0.035 mm, plain weave).
- reaction product was put into a large amount of acetone to precipitate a resin.
- Example 1 Manufacture of liquid material U-10 for resin layer formation> Aqueous dispersion O-1, an aqueous polyvinyl alcohol solution (VC-10, manufactured by Nippon Vinegar Poval Co., average polymerization degree: 1,000, solid content concentration: 10% by mass), and an aqueous solution of an oxazoline compound (Nippon Shokubai Co., Ltd.) Epocross WS-700, solid content concentration: 25% by mass) and mixed so that the solid content mass ratio of each component is 100: 300: 5, and then diluted with water to obtain a solid content concentration of 8% by mass. Liquid U-10 was obtained.
- the obtained release film is 800 mm wide and has a winding tension on a paper tube having an outer diameter of 10.5 cm using a contact pressure roll (maximum height SRmax is 7 ⁇ m) having a hard chrome plating on the surface.
- the film was wound on a roll having a length of 500 m under the conditions of 118 N / m, winding contact pressure 118 N / m, and winding speed 100 m / min.
- the friction coefficient of the contact pressure roll was 0.3, and the holding angle of the film was 120 °.
- Example 2 A release film was obtained in the same manner as in Example 1 except that a carbodiimide compound (Carbodilite SV-02 manufactured by Nisshinbo Co., Ltd.) was used as a crosslinking agent and the amount was 19 parts by mass with respect to 100 parts by mass of the acid-modified polyolefin resin. Obtained.
- a carbodiimide compound Carbodilite SV-02 manufactured by Nisshinbo Co., Ltd.
- Comparative Examples 5-8 A liquid material for forming a resin layer having the composition shown in Table 1 was applied to a film wound in the same manner as in Example 1 except that the liquid material for forming a resin layer was not applied, using a Mayer bar. Then, the film was dried at 120 ° C. for 30 seconds to form a 0.2 ⁇ m thick resin layer on the film, and aged at 50 ° C. for 2 days to obtain a release film.
- Comparative Example 9 The film roll was wound up in the same manner as in Example 1 except that the resin layer forming liquid was not applied.
- Table 1 shows the constitution of the liquid material for forming a resin layer used in Examples and Comparative Examples and the evaluation results of the obtained release film.
Abstract
Description
しかし、特許文献1、2に記載の樹脂層は、基材との密着性に乏しく、被着体を剥離する際にこれらの離型性を有する樹脂が被着体に転写し、被着体の機能、例えば、粘着性などを低下させるという問題がある。また、特許文献3に記載の樹脂は、高価なうえ、使用後の廃棄焼却処理において燃焼しにくく、かつ、有毒ガスを発生するという問題がある。また、離型性を有する樹脂を均一にコーティングするためには大量の有機溶剤を使用するという問題がある。
特許文献4~7に記載の樹脂層は、アクリル系被着体に対する離型性に優れるものである。しかし特許文献4~7に記載の樹脂層は、その組成によっては、他の被着体、特にゴム系被着体に対する離型性に乏しくなることがあり、全く剥離できないか、剥離できたとしても剥離後の被着体表面に予期しない不必要な模様を生じて良好な表面を得ることができないなど、被着体が制限されることがあった。
また、特許文献4~7に記載された、ポリエステルフィルムの一方の面に樹脂層が設けられた離型フィルムは、ロール状に巻いた場合、樹脂層の組成によっては、樹脂層が設けられた面の反対面に樹脂層の成分が移行して、反対面が汚染されることがあった。
(1)ポリエステルフィルムの一方の面に樹脂層が設けられた離型フィルムであって、
樹脂層が、酸変性成分の割合が1~10質量%である酸変性ポリオレフィン樹脂と、ポリビニルアルコールと、架橋剤とを含有し、
酸変性ポリオレフィン樹脂100質量部に対して、ポリビニルアルコールの含有量が、200質量部を超え、1000質量部以下であり、架橋剤の含有量が1~20質量部であり、
ゴム系被着体を樹脂層に貼り付けて測定したときの樹脂層と被着体との間の剥離力が0.5N/cm以下であることを特徴とする離型フィルム。
(2)酸変性ポリオレフィン樹脂のオレフィン成分が、エチレンおよび/またはプロピレンを含むことを特徴とする(1)に記載の離型フィルム。
(3)樹脂層が設けられた面の反対面における水の接触角が80°以下であることを特徴とする(1)または(2)に記載の離型フィルム。
(4)上記(1)に記載の離型フィルムを製造するための方法であって、酸変性成分の割合が1~10質量%である酸変性ポリオレフィン樹脂と、ポリビニルアルコールと、架橋剤と、液状媒体とを含有し、酸変性ポリオレフィン樹脂100質量部に対して、ポリビニルアルコールの含有量が、200質量部を超え、1000質量部以下であり、架橋剤の含有量が1~20質量部である液状物をポリエステルフィルムに塗布する工程と、液状物の塗布されたポリエステルフィルムを乾燥、延伸および熱処理する工程を含むことを特徴とする離型フィルムの製造方法。
本発明の離型フィルムは、プリント配線板などを製造する際の工程材料、粘着材料や液晶ディスプレー用部品などの保護材料、イオン交換膜やセラミックグリーンシートなどのシート状構造体の成形材料などに好適である。
本発明の離型フィルムは、基材としてのポリエステルフィルムの一方の面に、樹脂層が設けられたものであり、樹脂層は、酸変性ポリオレフィン樹脂とポリビニルアルコールと架橋剤とを含有する。
係るポリエステルの好ましい具体例としては、ポリエチレンテレフタレート、ポリエチレンイソフタレート、ポリテトラメチレンテレフタレート、ポリ(1,4-シクロヘキシレンジメチレンテレフタレート)、ポリエチレン-2,6-ナフタレート等のポリエステルや、それらの共重合体が挙げられる。
上記共重合体を構成することができる成分としては特に限定されず、酸成分としてイソフタル酸、フタル酸、2,6-ナフタレンジカルボン酸、5-ナトリウムスルホイソフタル酸、シュウ酸、コハク酸、アジピン酸、セバシン酸、アゼライン酸、ドデカン二酸、ダイマー酸、無水マレイン酸、マレイン酸、フマル酸、イタコン酸、シトラコン酸、メサコン酸、シクロヘキサンジカルボン酸等のジカルボン酸、4-ヒドロキシ安息香酸、ε-カプロラクトンや乳酸等が挙げられる。
また、アルコール成分としては、エチレングリコール、ジエチレングリコール、1,3-プロパンジオール、ネオペンチルグリコール、1,6-ヘキサンジオール、シクロヘキサンジメタノール、トリエチレングリコール、ポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレングリコール、ビスフェノールAやビスフェノールSのエチレンオキシド付加体等が挙げられる。
さらに、トリメリット酸、トリメシン酸、ピロメリット酸、トリメチロールプロパン、グリセリン、ペンタエリスリトール等の3官能化合物等を少量用いてもよい。
これらの共重合成分は2種以上併用してもよい。また、2種以上のポリエステルをブレンドして用いてもよい。
本発明において、ポリエステルとしては、ポリエチレンテレフタレートやポリエチレン-2,6-ナフタレートが特に好ましい。
重合後のポリエステルは、モノマーやオリゴマー、副生成物のアセトアルデヒド等を含有しているため、減圧もしくは不活性ガス流通下、200℃以上の温度で固相重合してこれらを除くことが好ましい。
また、後述する樹脂層表面粗さの好ましい範囲を外れなければ、ポリエステル中に粗面化物質を含有させてもよく、粗面化物質の最大粒径は0.2μm以下であることが望ましい。粗面化物質としては例えば、二酸化ケイ素、炭酸カルシウム、カオリナイト、二酸化チタン、シリカアルミナ等の無機粒子や、シリコーンやポリメタクリル酸メチル、エチルビニルベンゼン等の有機粒子が挙げられる。粗面化物質は、単独または2種以上を組み合わせて用いることができる。
まず、十分に乾燥されたポリエステルを、押出機に供給し、十分に可塑化され、流動性を示す温度以上で溶融し、必要に応じて選ばれたフィルターを通過させ、その後Tダイを通じてシート状に押出す。このシートを、ポリエステルのガラス転移温度(Tg)以下に温度調節した冷却ドラム上に密着させて、未延伸フィルムを得る。
得られた未延伸フィルムを一軸延伸法により一軸配向させるか、もしくは二軸延伸法により二軸配向させる。二軸延伸法としては、特に限定はされないが逐次二軸延伸法や同時二軸延伸法を用いることができる。
同時二軸延伸法では、未延伸フィルムをポリエステルのTg~Tgより50℃高い温度の範囲で長手および巾方向にそれぞれ2~4倍程度の延伸倍率となるよう二軸延伸する。同時二軸延伸機に導く前に、未延伸フィルムに1.2倍程度までの予備縦延伸を施しておいてもよい。
また、逐次二軸延伸法では、未延伸フィルムを、加熱ロールや、赤外線等で加熱し、長手方向に延伸して縦延伸フィルムを得る。延伸は2個以上のロールの周速差を利用し、ポリエステルのTg~Tgより40℃高い温度の範囲で2.5~4.0倍とするのが好ましい。縦延伸フィルムは続いて連続的に、巾方向に横延伸、熱固定、熱弛緩の処理を順次施して二軸配向フィルムとする。横延伸はポリエステルのTg~Tgより40℃高い温度で開始し、最高温度はポリエステルの融点(Tm)より(100~40)℃低い温度であることが好ましい。横延伸の倍率は最終的なフィルムの要求物性に依存し調整されるが、3.5倍以上、さらには3.8倍以上とするのが好ましく、4.0倍以上とするのがより好ましい。長手方向と巾方向に延伸後、さらに、長手方向および/または巾方向に再延伸することにより、フィルムの弾性率を高めたり寸法安定性を高めたりすることもできる。
延伸に続き、ポリエステルのTmより(50~10)℃低い温度で数秒間の熱固定処理と、熱固定処理と同時にフィルム幅方向に1~10%の弛緩することが好ましい。熱固定処理後、フィルムのTg以下に冷却して二軸延伸フィルムを得る。
基材ポリエステルフィルムとして多層フィルムを使用する場合、多層フィルムの外層のうち、樹脂層が設けられる層は、上記粗面化物質を含有しないことが好ましい。樹脂層が設けられる層に粗面化物質を含有させないことにより、樹脂層を設けた層の表面粗さが小さくなる。また、樹脂層との界面および樹脂層表面へ粗面化物質がブリードアウトすることがなく、樹脂層と基材フィルムの密着性低下や、剥離時の被着体汚染を防ぐことができる。
多層フィルムは、上記製造方法において、それぞれの層を構成するポリエステルを別々に溶融して、複層ダイスを用いて押出し、固化前に積層融着させた後、二軸延伸、熱固定する方法や、2種以上のポリエステルを別々に溶融、押出してそれぞれフィルム化し、未延伸状態で又は延伸後に、それらを積層融着させる方法などによって製造することができる。プロセスの簡便性から、複層ダイスを用い、固化前に積層融着させることが好ましい。
酸変性ポリオレフィン樹脂を構成するオレフィン成分は、エチレンおよび/またはプロピレン含むことが好ましく、さらにブテンを含んでもよい。
側鎖に酸素原子を含むエチレン性不飽和成分としては、(メタ)アクリル酸と炭素数1~30のアルコールとのエステル化物が挙げられ、中でも入手のし易さの点から、(メタ)アクリル酸と炭素数1~20のアルコールとのエステル化物が好ましい。そのような化合物の具体例としては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸プロピル、(メタ)アクリル酸ブチル、(メタ)アクリル酸ヘキシル、(メタ)アクリル酸オクチル、(メタ)アクリル酸デシル、(メタ)アクリル酸ラウリル、(メタ)アクリル酸ドデシル、(メタ)アクリル酸ステアリル等が挙げられる。これらの混合物を用いてもよい。この中で、ポリエステルフィルムとの接着性の点から、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸ブチル、アクリル酸ヘキシル、アクリル酸オクチルがより好ましく、アクリル酸エチル、アクリル酸ブチルがさらに好ましく、アクリル酸エチルが特に好ましい。「(メタ)アクリル酸~」とは、「アクリル酸~またはメタクリル酸~」を意味する。
側鎖に酸素原子を含むエチレン性不飽和成分は、酸変性成分と同様、分子内に極性基を有している。そのため側鎖に酸素原子を含むエチレン性不飽和成分を酸変性ポリオレフィン樹脂中に含めることによって、ポリエステルフィルムとの密着性が高くなる。しかし、側鎖に酸素原子を含むエチレン性不飽和成分量が多すぎると、オレフィン由来の樹脂の性質が失われ、被着体との離型性が低下する可能性がある。酸変性ポリオレフィン樹脂中における、側鎖に酸素原子を含むエチレン性不飽和成分の割合は、1~40質量%であることが好ましく、2~35質量%であることがより好ましく、3~30質量%であることがさらに好ましく、6~18質量%であること特に好ましい。
なお、側鎖に酸素原子を含むエチレン性不飽和成分を含有する酸変性ポリオレフィン樹脂を用いても、ポリエステルフィルムとの密着性以外に樹脂層が有する離型性を損ねることがない。
また、側鎖に酸素原子を含むエチレン性不飽和成分を含む酸変性ポリオレフィン樹脂としては、アルケマ社製の無水マレイン酸変性ポリオレフィン樹脂であるボンダインシリーズの「LX-4110」、「HX-8210」、「HX-8290」、「TX-8030」などの商品が挙げられる。
ポリビニルアルコールは、後述のように液状物として使用する場合のために、水溶性を有していることが好ましい。
ポリビニルアルコールの平均重合度は、特に限定されるものではなく、例えば、300~5,000であり、樹脂層を形成するための液状物の安定性向上の観点からは、300~2,000であることが好ましい。
カルボジイミド化合物の具体例として、例えば、p-フェニレン-ビス(2,6-キシリルカルボジイミド)、テトラメチレン-ビス(t-ブチルカルボジイミド)、シクロヘキサン-1,4-ビス(メチレン-t-ブチルカルボジイミド)などのカルボジイミド基を有する化合物や、カルボジイミド基を有する重合体であるポリカルボジイミドが挙げられる。これらの1種又は2種以上を用いることができる。これらの中でも、取り扱いやすさから、ポリカルボジイミドが好ましい。
ポリカルボジイミドの市販品としては、日清紡社製のカルボジライトシリーズが挙げられ、具体的には、水溶性タイプの「SV-02」、「V-02」、「V-02-L2」、「V-04」;エマルションタイプの「E-01」、「E-02」;有機溶液タイプの「V-01」、「V-03」、「V-07」、「V-09」;無溶剤タイプの「V-05」が挙げられる。
オキサゾリン化合物の具体例として、例えば、2,2′-ビス(2-オキサゾリン)、2,2′-エチレン-ビス(4,4′-ジメチル-2-オキサゾリン)、2,2′-p-フェニレン-ビス(2-オキサゾリン)、ビス(2-オキサゾリニルシクロヘキサン)スルフィドなどのオキサゾリン基を有する化合物や、オキサゾリン基含有ポリマーが挙げられる。これらの1種又は2種以上を用いることができる。これらの中でも、取り扱いやすさからオキサゾリン基含有ポリマーが好ましい。
オキサゾリン基含有ポリマーの市販品としては、日本触媒社製のエポクロスシリーズが挙げられ、具体的には、水溶性タイプの「WS-500」、「WS-700」;エマルションタイプの「K-1010E」、「K-1020E」、「K-1030E」、「K-2010E」、「K-2020E」、「K-2030E」などが挙げられる。
さらに樹脂層は、表面粗さSRaが30nm以下であることが好ましい。SRaが30nmを超えると、電気絶縁材料用の平滑性フィルムとしての要求を満たさないことがある。なお、表面粗さSRaは、粗さの平均偏差であり、ある基準長さの区間においてその区間の粗さ曲線の平均値に対してフィルム表面の基準長さの区間における山谷の高さおよび深さの絶対値の平均値であり、山谷の高さと量からなる粗さの評価である。
上記表面粗さを達成するための方法は特に限定されないが、基材ポリエステルフィルムの樹脂層が設けられる層中に粗面化物質が実質的に含まれていないことが望ましい。実質的に含まれていないとは、意図的に粗面化物質が添加されないことを言う。
両親媒性有機溶剤とは、20℃における有機溶剤に対する水の溶解性が5質量%以上である有機溶剤をいう(20℃における有機溶剤に対する水の溶解性については、例えば「溶剤ハンドブック」(講談社サイエンティフィク、1990年第10版)等の文献に記載されている)。
両親媒性有機溶剤の具体例としては、メタノール、エタノール、n-プロパノール、イソプロパノール等のアルコール類、テトラヒドロフラン、1,4-ジオキサン等のエーテル類、アセトン、メチルエチルケトン等のケトン類、酢酸メチル、酢酸-n-プロピル、酢酸イソプロピル、プロピオン酸メチル、プロピオン酸エチル、炭酸ジメチル等のエステル類、エチレングリコール-n-ブチルエーテル等のエチレングリコール誘導体類、そのほか、アンモニアを含む、ジエチルアミン、トリエチルアミン、ジエタノールアミン、トリエタノールアミン、N,N-ジメチルエタノールアミン、N,N-ジエチルエタノールアミン等の有機アミン化合物、2-ピロリドン、N-メチル-2-ピロリドンなどのラクタム類等を挙げることができる。
酸変性ポリオレフィン樹脂の液状物としては、酸変性ポリオレフィン樹脂の水性分散体を用いることができる。酸変性ポリオレフィン樹脂を水性分散化する方法は、特に限定されないが、例えば、国際公開第02/055598号に記載された方法が挙げられる。
水性媒体中の酸変性ポリオレフィン樹脂の分散粒子径は、他の成分との混合時の安定性および混合後の保存安定性の点から、数平均粒子径が1μm以下であることが好ましく、0.8μm以下であることがより好ましい。このような粒径は、国際公開第02/055598号に記載の製法により達成可能である。なお、酸変性ポリオレフィン樹脂の数平均粒子径は動的光散乱法によって測定される。
酸変性ポリオレフィン樹脂の水性分散体の固形分濃度は、特に限定されるものではないが、水性分散体の粘性を適度に保つためには、1~60質量%が好ましく、5~30質量%がより好ましい。
樹脂層形成用液状物には、その性能が損なわれない範囲で、酸化防止剤、紫外線吸収剤、滑剤、着色剤などを添加することもできる。
得られた離型フィルムを10cm角に切り取り、外径が10.5cmの紙管に貼り付け、その上から、下記の方法によって調製したゴム系被着体のゴム層が離型フィルムの樹脂層と接するように貼り付けた。その上に、ポリエステルフィルム(ユニチカ社製、PET-12)を、巻取り張力118N/m、巻取り接圧118N/m、巻取り速度100m/分の条件で2000m巻き付け、60℃×3日間、熱風乾燥器中で静置した。圧着処理終了後、冷却し、表層の巻き付けたポリエステルフィルムを除去して、離型フィルムとゴム系被着体とが貼り付いた状態の試料を取り出した。
23℃×50%RHで2時間以上調湿した試料を15mm幅に切り出した後、離型フィルムの樹脂層とゴム系被着体との間の剥離抵抗を、島津製作所社製オートグラフを使って測定した。すなわち、離型フィルムを上部のチャックに固定し、ゴム系被着体を下部のチャックに固定し、離型フィルムが一直線になるように未剥離部分をゴム系被着体側に折り曲げ、300mm/分で剥離した際の剥離抵抗を計測した。5回の測定結果の平均を剥離力とした。
ゴム層として、スチレン-ブタジエン共重合体(電気化学工業社製「クリアレン」、スチレン/ブタジエン=30/70(質量比))45質量部と、ポリオレフィン樹脂(三井化学社製「タフマー」)45質量部と、耐衝撃性ポリエチレン(東洋スチレン社製「HI-E6」)10質量部とからなる樹脂混合物を用い、支持層として、ポリオレフィン樹脂(三井化学社製「タフマー」)60質量部と、低密度ポリエチレン(宇部興産社製「UBEポリエチレン」)40質量部とからなる樹脂混合物を用いて、T-ダイ法共押出法により、総厚み30μmの2層フィルム(ゴム層厚み10μm/支持層厚み20μm)を作製した。その際、T-ダイより押出されたフィルムを、シリコンゴム製のマットロール(支持層側)と、平均表面粗さを0.8μmに調整した金属製の冷却ロール(ゴム層側)で挟持して引き取った。
厚さ16μmの二軸延伸ポリエチレンテレフタレートフィルム(ユニチカ社製「エンブレットS-16」)を基材層として、この上に、前記2層フィルムの支持層側の面を積層面として、溶融押出した低密度ポリエチレンを介して、押出ラミネーションをおこない、ゴム系被着体(ゴム層/支持層/低密度ポリエチレン/基材層)を作製した。
得られた離型フィルムの樹脂層側に巾50mm、長さ150mmのポリエステル粘着テープ(日東電工社製No.31B/アクリル系粘着剤)をゴムロールで圧着して試料とした。試料を、金属板/ゴム板/試料/ゴム板/金属板の形で挟み、2kPa荷重、70℃の雰囲気で20時間放置し、その後30分以上冷却して常温に戻して剥離強度測定用試料を得た。剥離強度測定用試料の、粘着テープと離型フィルムとの剥離強度を、25℃の恒温室で引張試験機(インテスコ社製精密万能材料試験機2020型)にて測定した。剥離角度は180度、剥離速度は300mm/分である。
得られた離型フィルムを巻取ったロールを、40℃環境下で3日間静置した。処理終了後、冷却し、表層のフィルムを除去し、巻芯より50m位置の離型フィルムの樹脂層側表面とその反対面について、それぞれ水に対する接触角を液滴法によって測定した。すなわち、20℃65%RH環境下で、協和界面科学社製接触角計CA-Dを用いて、純水が直径2.0mmの水滴を作るよう滴下し、10秒後の接触角を測定した。5回の測定の平均値を採用した。
TAYLOR/Hobson社製タリサーフCCI6000を使用し、下記の条件で表面粗さSRa(標準偏差、nm)、表面粗さSRz(十点平均粗さ、μm)を測定し、10点平均した。
測定長:0.66mm×0.66mm
カットオフ:ロバストガウシアンフィルタ、0.25mm
<PE系酸変性ポリオレフィン樹脂水性分散体O-1の製造>
ヒーター付きの密閉できる耐圧1リットル容ガラス容器を備えた撹拌機を用いて、60.0gの酸変性ポリオレフィン樹脂(アルケマ社製ボンダインLX-4110、エチレン/アクリル酸エチル/無水マレイン酸=91/7/2(質量%)、MFR:5g/10分、融点:107℃、ビカット軟化点:83℃)、90.0gのイソプロパノール(IPA)、3.0gのN,N-ジメチルエタノールアミン(DMEA、樹脂中の無水マレイン酸単位のカルボキシル基に対して1.0倍当量)および147.0gの蒸留水をガラス容器内に仕込んだ。そして、撹拌翼の回転速度を300rpmとし、系内温度を140~145℃に保って、60分間撹拌した。その後、水浴につけて、回転速度300rpmのまま撹拌しつつ室温(約25℃)まで冷却した。その後、水性媒体から有機溶剤を除去するために、ロータリーエバポレーターを用い、水を添加しながら、浴温80℃で水性媒体の一部を留去した。その後、空冷にて室温(25℃)まで冷却したあと、300メッシュのステンレス製フィルター(線径0.035mm、平織)で加圧濾過(空気圧0.2MPa)した。これによって、乳白色の均一な酸変性ポリオレフィン樹脂水性分散体O-1(固形分濃度:20質量%、IPA:0質量%、DMEA:0.9質量%)を得た。数平均粒子径は80nmであった。
プロピレン-ブテン-エチレン三元共重合体(ヒュルスジャパン社製ベストプラスト708、プロピレン/ブテン/エチレン=64.8/23.9/11.3(質量%))280gを、4つ口フラスコ中、窒素雰囲気下で加熱溶融させた後、系内温度を170℃に保って攪拌下、不飽和カルボン酸として無水マレイン酸32.0gとラジカル発生剤としてジクミルパーオキサイド6.0gをそれぞれ1時間かけて加え、その後1時間反応させた。反応終了後、得られた反応物を多量のアセトン中に投入し、樹脂を析出させた。この樹脂をさらにアセトンで数回洗浄し、未反応の無水マレイン酸を除去した後、減圧乾燥機中で減圧乾燥して、酸変性ポリオレフィン樹脂(プロピレン/ブテン/エチレン/無水マレイン酸=60.3/22.2/10.5/7.0(質量%)、MFR:50g/10分、融点:135℃)を得た。
ヒーター付きの密閉できる耐圧1リットル容ガラス容器を備えた攪拌機を用いて、この酸変性ポリオレフィン樹脂60.0gと、45.0gのエチレングリコール-n-ブチルエーテル(Bu-EG)と、6.9gのDMEA(樹脂中の無水マレイン酸単位のカルボキシル基に対して1.0倍当量)と、188.1gの蒸留水とを上記のガラス容器内に仕込み、攪拌翼の回転速度を300rpmとして攪拌した。そうしたところ、容器底部には樹脂の沈澱は認められず、浮遊状態となっていることが確認された。そこでこの状態を保ちつつ、10分後にヒーターの電源を入れ加熱した。そして系内温度を140℃に保ってさらに60分間攪拌した。その後、空冷にて、回転速度300rpmのまま攪拌しつつ室温(約25℃)まで冷却した。その後、水性媒体から有機溶剤を除去するために、ロータリーエバポレーターを用い、水を添加しながら、浴温80℃で水性媒体の一部を留去した。その後、空冷にて室温(25℃)まで冷却したあと、300メッシュのステンレス製フィルター(線径0.035mm、平織)で加圧濾過(空気圧0.2MPa)することで、乳白色の均一な酸変性ポリオレフィン樹脂水性分散体O-2(固形分濃度:20質量%、Bu-EG:0質量%、DMEA:1.0質量%)を得た。数平均粒子径は100nmであった。なお、フィルター上には残存樹脂は殆どなかった。
ヒーター付きの密閉できる耐圧1リットル容ガラス容器を備えた撹拌機を用いて、酸変性プロピレン樹脂(三洋化成社製ユーメックス1001、プロピレン/無水マレイン酸=97.7/2.3(質量%)、酸価:26mgKOH/g、MFR:65g/10分(160℃下での測定結果)、融点:153℃)を60g、DMEAを6.3g、IPAを60g、蒸留水を174g仕込み、密閉した後、300rpmで撹拌しながら160℃(内温)まで加熱した。撹拌下、160℃で1時間保持した後、ヒーターの電源を切り室温まで撹拌下で自然冷却し、冷却後、水性媒体から有機溶剤を除去するために、ロータリーエバポレーターを用い、水を添加しながら、浴温80℃で水性媒体の一部を留去した。その後、空冷にて室温(25℃)まで冷却したあと、300メッシュのステンレス製フィルター(線径0.035mm、平織)で加圧濾過(空気圧0.2MPa)し、乳白色の均一な酸変性ポリオレフィン水性分散体O-3(固形分濃度:20質量%、IPA:0質量%、DMEA:2.0質量%)を得た。数平均粒子径は90nmであった。
上記酸変性ポリオレフィン樹脂水性分散体O-1の製造において、ロータリーエバポレーターを用いた有機溶剤の除去を行わなかった以外は同様の方法によって、乳白色の均一な酸変性ポリオレフィン樹脂水性分散体O-4(固形分濃度:20質量%、IPA:30質量%、DMEA:1.0質量%)を得た。数平均粒子径は80nmであった。
<樹脂層形成用液状物U-10の製造>
水性分散体O-1と、ポリビニルアルコール水溶液(日本酢ビ・ポバール社製VC-10、平均重合度:1,000、固形分濃度:10質量%)と、オキサゾリン化合物の水性溶液(日本触媒社製エポクロスWS-700、固形分濃度:25質量%)とを、各成分の固形分質量比率が100:300:5になるように混合し、その後、水で希釈して固形分濃度8質量%の液状物U-10を得た。
<離型フィルムの製造>
ポリエチレンテレフタレート(日本エステル社製UT-UBR、固有粘度:0.62、ガラス転移温度:78℃、融点:255℃)をスクリュー径90mmの押出機に投入して280℃で溶融したA層形成用の樹脂と、シリカ粒子(日揮触媒社製OSCAL(EN-5001SIV)、粒径1.0μm)を含有量が0.030質量%になるように添加したポリエチレンテレフタレート(固有粘度:0.62、ガラス転移温度:78℃、融点:255℃)をスクリュー径65mmの押出機に投入して280℃で溶融したB層形成用の樹脂とを、2層フィードブロック内で合流させ、総厚みが380μm、厚みの比(A層/B層)が22/3となるよう調整してTダイ出口より押出し、急冷固化してA層とB層とからなる未延伸フィルムを得た。
この未延伸フィルムをロール式縦延伸機で85℃の条件下、3.5倍に延伸し、その後、樹脂層形成用液状物U-10を、120メッシュのグラビアロールで2.7g/m2となるように、A層表面に塗布し、50℃の熱風乾燥炉を20秒通過させた。
その後、連続的にシート端部をフラット式延伸機のクリップに把持させ、100℃の条件下、横4.5倍に延伸を施し、その後、横方向の弛緩率を3%として、200~210℃で2秒間以上熱処理した後で、230℃で3秒間の熱処理を施して、厚さ25μmの2軸延伸ポリエステルフィルムの一方の面に、厚さ0.05μmの樹脂層が設けられた離型フィルムを得た。
得られた離型フィルムは、表面にハードクロムメッキが施された接圧ロール(最大高さSRmaxが7μm)を用いて、外径が10.5cmの紙管の上に巾800mm、巻取り張力118N/m、巻取り接圧118N/m、巻取り速度100m/分の条件で、長さ500mのロールに巻取った。接圧ロールの摩擦係数は0.3であり、フィルムの抱き角度は120゜とした。
架橋剤としてカルボジイミド化合物(日清紡社製カルボジライトSV-02)を使用し、酸変性ポリオレフィン樹脂100質量部に対して19質量部となるようにした以外は実施例1と同様にして、離型フィルムを得た。
樹脂層形成用液状物における酸変性ポリオレフィン樹脂水性分散体の種類、および、酸変性ポリオレフィン樹脂100質量部に対するポリビニルアルコールや、オキサゾリン化合物の質量部を表1に記載したように変更した以外は実施例1と同様にして、離型フィルムを得た。
樹脂層形成用液状物を塗布しなかった以外は実施例1と同様にして巻き取られたフィルムに対して、マイヤーバーを用いて、表1に記載の組成の樹脂層形成用液状物を塗布した後、120℃で30秒間乾燥させてフィルム上に厚さ0.2μmの樹脂層を形成させ、50℃で2日間エージングを行い、離型フィルムを得た。
樹脂層形成用液状物を塗布しなかった以外は実施例1と同様にしてフィルムロールを巻き取った。
Claims (4)
- ポリエステルフィルムの一方の面に樹脂層が設けられた離型フィルムであって、
樹脂層が、酸変性成分の割合が1~10質量%である酸変性ポリオレフィン樹脂と、ポリビニルアルコールと、架橋剤とを含有し、
酸変性ポリオレフィン樹脂100質量部に対して、ポリビニルアルコールの含有量が、200質量部を超え、1000質量部以下であり、架橋剤の含有量が1~20質量部であり、
ゴム系被着体を樹脂層に貼り付けて測定したときの樹脂層と被着体との間の剥離力が0.5N/cm以下であることを特徴とする離型フィルム。 - 酸変性ポリオレフィン樹脂のオレフィン成分が、エチレンおよび/またはプロピレンを含むことを特徴とする請求項1に記載の離型フィルム。
- 樹脂層が設けられた面の反対面における水の接触角が80°以下であることを特徴とする請求項1または2に記載の離型フィルム。
- 請求項1に記載の離型フィルムを製造するための方法であって、酸変性成分の割合が1~10質量%である酸変性ポリオレフィン樹脂と、ポリビニルアルコールと、架橋剤と、液状媒体とを含有し、酸変性ポリオレフィン樹脂100質量部に対して、ポリビニルアルコールの含有量が、200質量部を超え、1000質量部以下であり、架橋剤の含有量が1~20質量部である液状物をポリエステルフィルムに塗布する工程と、液状物の塗布されたポリエステルフィルムを乾燥、延伸および熱処理する工程を含むことを特徴とする離型フィルムの製造方法。
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JP2017132162A (ja) * | 2016-01-28 | 2017-08-03 | 三井化学東セロ株式会社 | 外観性能に優れたプロセス用離型フィルム、その用途、及びそれを用いた樹脂封止半導体の製造方法 |
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JP2020055307A (ja) * | 2018-09-27 | 2020-04-09 | ユニチカ株式会社 | 離型フィルム |
JP2021028177A (ja) * | 2015-12-03 | 2021-02-25 | 三井化学東セロ株式会社 | プロセス用離型フィルム、その用途、及びそれを用いた樹脂封止半導体の製造方法 |
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TW201435007A (zh) | 2014-09-16 |
KR20150105943A (ko) | 2015-09-18 |
JP5818958B2 (ja) | 2015-11-18 |
HK1211543A1 (en) | 2016-05-27 |
US20150322278A1 (en) | 2015-11-12 |
JPWO2014109340A1 (ja) | 2017-01-19 |
CN104768759B (zh) | 2017-10-20 |
JP5697807B2 (ja) | 2015-04-08 |
EP2944463A1 (en) | 2015-11-18 |
JP2015061764A (ja) | 2015-04-02 |
TWI600723B (zh) | 2017-10-01 |
EP2944463A4 (en) | 2016-08-24 |
EP2944463B1 (en) | 2017-07-05 |
CN104768759A (zh) | 2015-07-08 |
KR102322398B1 (ko) | 2021-11-05 |
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