WO2004033540A1 - メンブレンスイッチ用基材フィルムおよびメンブレンスイッチ - Google Patents
メンブレンスイッチ用基材フィルムおよびメンブレンスイッチ Download PDFInfo
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- WO2004033540A1 WO2004033540A1 PCT/JP2003/011303 JP0311303W WO2004033540A1 WO 2004033540 A1 WO2004033540 A1 WO 2004033540A1 JP 0311303 W JP0311303 W JP 0311303W WO 2004033540 A1 WO2004033540 A1 WO 2004033540A1
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Classifications
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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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/032—Organic insulating material consisting of one material
- H05K1/0326—Organic insulating material consisting of one material containing O
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/002—Materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/072—High temperature considerations
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0393—Flexible materials
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/91—Product with molecular orientation
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24917—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including metal layer
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/266—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or substrate
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
Definitions
- the present invention relates to a base film for a membrane switch comprising a biaxially oriented polyester film containing polyethylene-1,6-naphthylene dicarboxylate as a main component. More specifically, a base film for membrane switches that is excellent in durability and durability, particularly a base film for membrane switches that is suitable for use in equipment in automobiles that may be exposed to high temperatures. About.
- a membrane switch is one in which opposing contacts (electrodes) are arranged on opposing surfaces of two base film with a spacer in between. Then, by pressing the base film, that is, by changing the interval between the base films, a switching action such as conduction and insulation can be easily performed.
- membrane switches have been widely used as key pads for mobile phones and portable personal computers, and various control panel switches for household electric appliances such as VTRs and microwave ovens.
- PET polyethylene terephthalate
- Japanese Patent Publication No. 4-75610 proposes to use a base film made of polyethylene naphthalenedicarboxylate (hereinafter sometimes abbreviated as “PEN”), which has a higher glass transition temperature than PET film. ing.
- PEN polyethylene naphthalenedicarboxylate
- Japanese Patent Publication No. 75610/1992 discloses that a membrane switch in which opposing contacts are arranged on two opposing surfaces of two base films has an F-5 value (elongation of 5%) as at least one base film. stress) is not less 1 1 kg / mm 2 or more, a density of 1. is a 375 gZcm 3 below, and thermal shrinkage factor when heated for 30 minutes at 120 ° C is 1. or less 0% biaxially oriented polyethylene
- F-5 value elongation of 5%
- Japanese Patent Publication No. 6-4276 states that the haze increase rate defined by the following equation when heat-treated at 150 for 2 hours
- Haze increase rate ⁇ (H2-H1) / H1 ⁇ X 100 (%)
- H 1 is the haze value before heat treatment
- H 2 is the haze value after heat treatment
- the heat shrinkage rate at that time is The direction in which the film is formed during continuous film formation, sometimes referred to as the longitudinal direction, longitudinal direction, continuous film forming direction or MD direction of the film, and the width direction (the direction perpendicular to the film forming direction in the in-plane direction of the film). And may also be referred to as TD or transverse direction.
- a polyester film for a membrane switch which is made of polyethylene naphthalate and has a content of 0.5% or less, is disclosed.
- a first object of the present invention is to solve the above-mentioned problems of the prior art, and to be used in equipment in a vehicle, which is excellent in film handling and durability, and which is particularly likely to be exposed to high temperatures.
- the present invention relates to a base film suitable for a membrane switch.
- a second object of the present invention relates to a substrate film for a membrane switch which has excellent workability when punching a film into a shape of a membrane switch.
- Polyethylene is composed of a biaxially oriented polyester film containing 2,6-naphthalenedicarboxylate as a main component, and has a refractive index of 1.7 on both surfaces in at least one direction in the film forming direction and the width direction. This is attained by a base film for a membrane switch having a refractive index difference between the two surfaces of from 0.70 to 1.790 and an absolute value of not more than 0.015.
- Polyethylene is composed of a biaxially oriented polyester film containing 2,6-naphthalenedicarboxylate as a main component.
- the film has a melting subpeak temperature of at least 220 ° C measured by a differential scanning calorimeter (DSC). This can also be achieved by a membrane switch base film having a temperature of 0 ° C or less and a difference between the melting subpeak temperature on one surface and the melting subpeak temperature on the other surface of 6 ° C or less in absolute value. .
- DSC differential scanning calorimeter
- a membrane switch comprising the first, second or third membrane switch base film of the present invention, a spacer and an electrode.
- the polymer constituting the biaxially oriented polyester film of the present invention is polyethylene-2,6-naphthylene dicarboxylate (hereinafter sometimes referred to as PEN). ) As a main component, and may be a copolymer or a mixture.
- PEN polyethylene-2,6-naphthylene dicarboxylate
- the term “principal” as used herein means that ethylene 2,6-naphthalenedicarboxylate is at least 8 Omo 1% of all repeating units of the polymer, more preferably at least 9 Omo 1%, particularly preferably at least 95 mo 1%. It is. That is, it suffices that the permanent properties of the biaxially oriented polyester film of the present invention can be ensured without extremely losing the original properties and the permanent deformation resistance when used at high temperatures.
- a compound having two ester-forming functional groups in a molecule can be used as a copolymerization component constituting a copolymer other than the main component ethylene-2,6-naphthalenedicarboxylate.
- Such compounds include oxalic acid, adipic acid, fluoric acid, sebacic acid, dodecanedicarboxylic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, Dicarboxylic acids such as phenylindanedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, tetralindicarboxylic acid, decalindicarboxylic acid, and diphenyletherdicarboxylic acid can be preferably used. Also, oxycarboxylic acids such as P-oxybenzoic acid and p-oxyethoxybenzoic acid can be preferably used.
- the acid components are isophthalic acid, terephthalic acid, 4,4'-diphenyldicarboxylic acid, 2,7-naphthalenedicarboxylic acid and p-oxybenzoic acid, and the dalicol component is triglyceride.
- Preferred are ethylene oxide adducts of methylene glycol, hexamethylene glycol neopentyl diol and bisphenolsulfone.
- the PEN used in the present invention may be one obtained by blocking a terminal hydroxyl group and Z or a carboxyl group partially or entirely with a monofunctional compound such as benzoic acid or methoxypolyalkylene glycol.
- the PEN used in the present invention was copolymerized with a very small amount of an ester-forming compound having three or more functions such as glycerin and pen-erythritol within a range where a substantially linear polymer can be obtained. It may be something.
- the polymer constituting the substrate film for a membrane switch of the present invention may be a mixture of PEN and another organic polymer.
- Organic polymers to be mixed with PEN include polyethylene terephthalate, polyethylene isophthalate, polytrimethylene terephthalate, polyethylene 1,4,4'-tetramethylenediphenyl dicarboxylate, polyethylene-2 , 7-Naphthalenediol Rupoxylate, polytrimethylene-1,2,6-naphthylenedicarboxylate, polyneopenthylene-2,6-naphthalenedicarboxylate, poly (bis (4-ethyleneoxyphenyl) sulfone ) —2,6-naphthalenedicarboxylate.
- the organic polymer mixed with these PENs may be used alone or in combination of two or more.
- the proportion of the organic polymer to be mixed with PEN is at most 20 mol%, preferably at most 10 mol%, particularly preferably at most 5 mol 1%, in the repeating unit of the polymer.
- the production of such a mixture can be carried out by a generally known method for producing a polyester composition.
- the polyester constituting the base film in the present invention can be obtained by a conventionally known method.
- the polymerization reaction may be performed in the presence of a catalyst.
- transesterification catalyst examples include compounds containing sodium, magnesium, magnesium, calcium, zinc, strontium, titanium, zirconium, manganese, and cobalt. These may be used alone or in combination of two or more.
- the polymerization catalyst include antimony compounds such as antimony trioxide and antimony pentoxide, germanium compounds typified by germanium dioxide, tetraethyl titanate, tetrapropyl titanate, tetraphenyl titanate and the like. Titanium compounds such as partially hydrolyzed products, titanyl ammonium oxalate, potassium titanyl oxalate, and titanium trisacetyl acetate.
- phosphorus compounds such as trimethyl phosphate, triethyl phosphate, tri-n-butyl phosphate and orthophosphoric acid are used to deactivate the transesterification catalyst before the polymerization reaction. Is added.
- the content of the phosphorus compound is preferably from 20 to 100 weight ppm in PEN as a phosphorus element from the viewpoint of the thermal stability of the polyester.
- polyester can be formed into chips after melt polymerization and solid-phase polymerized under reduced pressure by heating or in an inert gas stream such as nitrogen.
- the polyester having PEN as a main component preferably has an intrinsic viscosity of 0.40 dZg or more and 0.90 d1 Zg or less. More preferably 0.43-0. 85 d1Zg, particularly preferably 0.45 to 0.80 dlZg. If the intrinsic viscosity is less than the lower limit, the film becomes brittle, and the film may be easily broken at the time of film formation. If the intrinsic viscosity of the film exceeds the upper limit, the intrinsic viscosity of the polymer needs to be considerably increased, and the ordinary synthesis method requires a long time for polymerization and may lower productivity.
- the intrinsic viscosity is a value (unit: d1 / g) measured at 35 ° C using o-chlorophenol as a solvent.
- the film for a membrane switch of the present invention preferably contains a small proportion of inert particles in order to impart slipperiness to the film.
- inert particles include inorganic particles such as spherical silica, porous silica, calcium carbonate, alumina, titanium dioxide, kaolin clay, barium sulfate, and zeolite, or organic particles such as silicone resin particles and cross-linked polystyrene particles. Can be mentioned. It is preferable that the inorganic particles be synthetic rather than natural products because of their uniform particle size.
- the crystal form, hardness, specific gravity, and color of the inorganic particles are not particularly limited, and can be used according to the purpose.
- Specific inorganic particles include calcium carbonate, porous silica, spherical silica, calcium phosphate, talc, magnesium carbonate, barium carbonate, calcium sulfate, platinum sulfate, lithium phosphate, calcium phosphate, magnesium phosphate, and aluminum oxide.
- Examples include aluminum, silicon oxide, titanium oxide, zirconium oxide, and lithium fluoride.
- calcium carbonate particles, spherical silica particles, porous silica particles, and plate-like aluminum silicate are particularly preferable.
- organic particles examples include organic salt particles and crosslinked polymer particles.
- organic salt particles include terephthalates such as calcium oxalate, calcium, barium, zinc, manganese, and magnesium.
- crosslinked polymer particles include homopolymers and copolymers of vinyl monomers such as divinylbenzene, styrene, acrylic acid, and methacrylic acid.
- polytetrafluoroethylene, silicone tree benzoguanamine, thermosetting epoxy resin, unsaturated polyester resin, thermosetting urea resin, thermosetting phenol resin Organic particles such as are preferred.
- silicone resin particles and crosslinked polystyrene particles are particularly preferred.
- the average particle diameter of each type of particles is preferably 0.05 m or more and 5 m or less, and 0.08 zm or more and 3.5 m or less. m, more preferably 0.1010 or more and 3111 or less.
- the total amount of inert particles contained in the film is preferably 0.05% by weight or more and 3% by weight or less, more preferably 0.08% by weight or more and 2.5% by weight or less. It is particularly preferred that the content be 0.1% by weight or more and 2.0% by weight or less.
- the inert particles to be added to the film may be a single component selected from those exemplified above, or may be a multicomponent including two or more components. In the case of a single component, two or more types of particles having different average particle sizes may be contained.
- the average particle size of the inert particles was measured using a Shimadzu CP-50 type centrifugal particle size analyzer (Cen trifuga l Particle Size Analyzer 1 yzer). This is a value obtained by reading the particle size corresponding to 50% by weight from the integrated curve of particles of each particle size and its abundance calculated based on the obtained centrifugal sedimentation curve. , 1975, pages 242-247).
- the substrate film of the present invention comprises calcium carbonate particles having an average particle size of 0.3 // m or more and 0.8 m or less, from 0.1% by weight to 0.4% by weight, and / or an average particle size.
- spherical silica particles having a particle size of not less than 0. lim and not more than 0.6 / m and silicone particles having a Z or average particle size of not less than 0. It is particularly preferred that the content is not less than 0.03% by weight and not more than 0.4% by weight.
- particles of the same type of inert fine particles having different particle diameters may be contained at the same time, and in such a case, the content of the whole inert particles of the same type may be within the above range.
- the substrate film of the present invention may contain a nucleating agent, an antioxidant, a heat stabilizer, a lubricant, a flame retardant, an antistatic agent, a polysiloxane, and the like, depending on the application.
- a nucleating agent an antioxidant, a heat stabilizer, a lubricant, a flame retardant, an antistatic agent, a polysiloxane, and the like.
- the timing of adding the inert particles and other additives as long as it is a stage before the formation of the polyester containing PEN as a main component.For example, it may be added at the polymerization stage. May be added. From the viewpoint of uniform dispersion, it is necessary to add inert particles and other additives to ethylene glycol and add them at a high concentration during polymerization to obtain a mass chip, and dilute the obtained master chip with an additive-free chip. I like it.
- Tsm melting sub-peak temperature
- DSC differential scanning calorimeter
- the melting sub-peak temperature (Tsm) is more preferably 225 or more and 245 or less, and particularly preferably 230 or more and 245 or less.
- the absolute value of the difference between the melting sub-peak temperatures (Tsm) of the front and back surfaces of the film (I Tsm (front surface) -Tsm (back surface) I) is more preferably 5t: or less, particularly preferably 4 ° C or less. is there.
- the refractive index in at least one direction in the film forming direction and the width direction needs to be 1.770 or more and 1.790 or less. More preferably, it is 1.772 or more and 1.788 or less. In the present invention, it is not particularly noted.
- the film forming direction is the direction in which the film is continuously formed, and may be referred to as the longitudinal direction, longitudinal direction, continuous film forming direction, or MD direction of the film.
- the width direction is a direction perpendicular to the film forming direction in the in-plane direction of the film, and may be referred to as a lateral direction or TD.
- both the refractive index in the film forming direction and the refractive index in the width direction are less than the lower limits, the durability of the film deteriorates.
- the refractive index in both the film forming direction and the width direction exceeds the upper limit, cutting frequently occurs in the production of the film.
- the refractive index of the film was measured for each surface of the film using a laser refractometer (measuring wavelength: 633 nm) using the principle of Abbe refractometer.
- the refractive index on one surface (temporarily “surface”) of the film and the other surface in at least one direction having a refractive index of 1.770 or more and 1.790 or less needs to be 0.015 or less. It is more preferably at most 0.013, particularly preferably at most 0.011. If the absolute value of the difference between the refractive index of the front and back surfaces of the film in at least one direction with a refractive index of 1.770 or more and 1.790 or less exceeds 0.015, the film is cut into a sheet. Small cracks and burrs are likely to be generated on the cut end face, and the film tends to be curled after the film is wound up and stored for a while as a roll.
- the refractive index in the width direction on each surface of the base film of the present invention is preferably 1.770 or more and 1.790 or less. It is more preferably 1.772 or more and 1.7788 or less.
- the refractive index was measured for each surface of the film using a laser refractometer (measuring wavelength: 633 nm) using the Abbe refractometer principle. If the refractive index in the width direction of the film is less than the lower limit, the durability of the film may be deteriorated. On the other hand, if the refractive index of the film exceeds the upper limit, the frequency of cutting in the production of the film increases.
- the base film of the present invention preferably contains a phosphorus compound.
- phosphorus compounds include phosphoric acid, phosphorous acid, phosphonic acid, phosphonate compounds and derivatives thereof, and these may be used alone or in combination of two or more.
- a phosphonate compound represented by the following formula (I) is preferable as the phosphorus compound.
- R 1 and R 2 are an alkyl group having 1 to 4 carbon atoms
- X is —CH 2 — or one CH (Y) — (Y represents a phenyl group).
- R 1 and R 2 may be the same or different.
- Particularly preferred phosphorus compounds are carpomethoxymethanephosphonic acid, carboxymethanephosphonic acid, carboxypropoxymethanephosphonic acid, carboxymethoxyphosphonic acid, carboxymethoxyphosphonophenylacetic acid, carbethoxy-phosphonophenylacetic acid, and carboxymethoxyphosphonophenylacetic acid.
- these phosphonate compounds are preferred because the reaction with the titanium compound proceeds relatively slowly as compared with the phosphorus compound which is usually used as a stabilizer. This is because the duration of the activity is long, and as a result, the amount of catalyst added to the polyester can be reduced, and even if a large amount of a stabilizer is added to the catalyst, the thermal stability of the polyester is not easily impaired.
- These phosphorus compounds may be added at any time after the transesterification reaction is substantially completed, for example, under atmospheric pressure before starting the polycondensation reaction, or under reduced pressure after starting the polycondensation reaction. May be added at the end of the polycondensation reaction or after the completion of the polycondensation reaction, that is, after the polymer is obtained.
- the catalyst used for the production of PEN is preferably a titanium compound which is substantially soluble in PEN, for the purpose of reducing foreign matter caused by the catalyst. That is, the amount of each of the antimony element and the germanium element derived from the antimony compound or the germanium compound generally used as a conventional catalyst is the following. It is preferably at most 5 mmo 1% based on the number of moles of the styrene-2,61-naphthalenedicarboxylate component. If the contents of the antimony element and the germanium element exceed 5 mmol%, problems such as the deposition of foreign substances caused by these catalysts will occur.
- Such a titanium compound is not particularly limited as long as it is soluble in the polymer, and includes a general titanium compound as a polycondensation catalyst for a polyester, for example, titanium acetate / tetra-n-butoxytitanium.
- a reaction product of a compound represented by the following formula (II) or a compound represented by the formula (II) and an aromatic polycarboxylic acid or an anhydride thereof represented by the following formula (III) is obtained. preferable.
- R 3 , R 4 , R 5 , and R 6 in the formula (II) each have 2 or more carbon atoms; L represents an alkyl group and / or a phenyl group.
- n in the above formula (III) represents an integer of 2 to 4.
- the tetraalkoxide titanium represented by the above formula ( ⁇ ) is not particularly limited as long as R 3 , R 4 , R 5 and R 6 are each an alkyl group and / or a phenyl group having 2 to 10 carbon atoms.
- Particularly preferred tetraalkoxytitanium represented by the above formula ( ⁇ ⁇ ) is tetraisopropoxytitanium, tetrapropoxytitanium, tetran-butoxytitanium, tetraethoxytitanium, and tetraphenoxytitanium.
- aromatic polycarboxylic acid represented by the above formula (III) phthalic acid, trimellitic acid, hemimelittic acid, and pyromellitic acid are preferred, and the aromatic polycarboxylic acid represented by the general formula ( ⁇ ) is preferable.
- the aromatic polycarboxylic acid may be an anhydride thereof. Titanium above In order to react the compound with the aromatic polycarboxylic acid, a part of the aromatic polycarboxylic acid or its anhydride is dissolved in a solvent, and the titanium compound is added dropwise thereto, and the temperature is 0 to 200 ° C. And let it react for at least 30 minutes.
- the content of the titanium compound as a catalyst is preferably 4 mmo 1% or more and 15 mmo 1% or less as a titanium element based on the number of moles of the ethylene-2,6-naphthylene dicarboxylate component. More preferably, it is 6 mmo 1% or more and 12 mmo 1% or less, particularly preferably 6 mmo 1% or more and 1 Ommo 1% or less. If the content of the titanium compound is less than the lower limit, the productivity of PEN decreases, and it is difficult to obtain PEN having a desired molecular weight.
- the content of the titanium compound soluble in PEN refers to the titanium compound used as a transesterification catalyst and the titanium compound used as a polycondensation reaction catalyst when transesterification is used. Shows the sum of the compounds.
- the base film of the present invention preferably contains the above-mentioned titanium compound as a catalyst and a phosphorus compound as a stabilizer at the stage of producing the resin composition. It is preferable that the contents of the titanium compound and the phosphorus compound satisfy the following formulas (1) to (3) in combination with the above conditions.
- Ti is a value obtained by dividing the number of moles of the titanium compound as a titanium element by the number of moles of the ethylene-1,2,6-naphthalenedicarboxylate component in the composition (mmo 1 P is a value (mmo 1%) obtained by dividing the number of moles of the phosphorus compound as a phosphorus element by the number of moles of ethylene-1,6-naphthalenedicarboxylate component in the composition.
- (P / T i) is less than the lower limit, the thermal stability of the obtained PEN deteriorates, and the thermally degraded material precipitates near the die slit and contaminates the exit of the slit and the periphery of the die. There are cases.
- (PZT i) exceeds the upper limit, the reactivity during the polymerization of PEN is greatly reduced, and it may be difficult to obtain PEN having a desired molecular weight.
- the more preferable range of (P / T i) is 2 or more and 10 or less.
- (T i + P) is less than the lower limit, the productivity in the film forming process by the electrostatic coating method may decrease, and the uniformity of the film thickness may deteriorate.
- (T i + P) exceeds the upper limit, foreign substances due to the catalyst are likely to be generated in a small amount, but foreign substances due to the catalyst are deposited near the die slit of the melt extruder during film production, and the film is formed. It may cause streak-like surface defects along the direction.
- the more preferable range of (T i + P) is 25 or more and 100 or less.
- the PEN in the present invention can be obtained by using 2,6-naphthalenedicarboxylic acid and ethylene glycol as raw materials, and can form an ester of 2,6-naphthalenedicarboxylic acid represented by 2,6-dimethylnaphthalate.
- Derivatives and ethylene glycol may be used as raw materials.
- a production method via an ester exchange reaction in which at least 8% of the total dicarbonic acid component used as a raw material is 2,6-dimethylnaphthalate at 8% or more of Omo is preferable.
- At least a part of the titanium compound is added before the start of the ester exchange reaction, and the two catalysts, the ester exchange reaction catalyst and the polycondensation reaction catalyst, are used. This method is more preferable because the amount of the titanium compound added can be reduced. Further, it is preferable to carry out the transesterification under a pressure of not less than 0.05 MPa and not more than 0.2 OMPa because the addition amount of the titanium compound can be further reduced.
- the heat shrinkage in the film forming direction and the width direction is preferably 0.2% or more and 1.4% or less, and 0.3% or less. % Or more and 1.3% or less is more preferable. If the heat shrinkage after heating at 200 ° C for 10 minutes exceeds the upper limit, the dimensional change will increase, and the pre-heating before processing into a membrane switch may deteriorate the flatness of the film. On the other hand, if the heat shrinkage ratio is less than the lower limit, the durability of the membrane switch may be deteriorated.
- the difference between the heat shrinkage in the film forming direction and the width direction after heat treatment at 20 O ⁇ C for 10 minutes is not particularly limited.
- the difference between the heat shrinkage in the film forming direction and the heat shrinkage in the width direction is ⁇ 1.0% or more and 0.5% or less.
- the thickness of the substrate film for a membrane switch of the present invention is preferably 40 111 to 190 m, more preferably 45 m to 175 m, and particularly preferably 50 m to 160 m. If the thickness of the film is less than the lower limit, the durability against repeated pressing may be insufficient. On the other hand, if the thickness of the film exceeds the upper limit, it becomes very difficult to bend, which is not preferable for membrane switches.
- the variation in the thickness of the film of the present invention at an arbitrary position is preferably 10% or less, more preferably 8% or less, with respect to the center thickness of the film.
- the surface roughness of the substrate film for a membrane switch of the present invention is preferably at least one surface of 10 nm or more and 45 nm or less. It is more preferably from 10 nm to 40 nm, particularly preferably from 12 nm to 35 nm. If SR a is less than the lower limit, a large number of sheet-like films are piled up, and when one film is sequentially sent out to the switch manufacturing process, a slippage between the films may occur, leading to poor feeding. There is. On the other hand, if the SR a exceeds the upper limit, the film may slip too much when a large number of sheet-like films are piled up, resulting in frequent misalignment during film stacking.
- the density of the base film of the present invention is preferably 1.3508 ⁇ 111 3 or more 1. is 367 g / cm 3 or less. More preferably 1.3528 (: 111 3 or more and 1.365 gZcm 3 or less, particularly preferably 1.354 1 01 3 or more and 1.363 g / cm 3 It is as follows. If the density is less than the lower limit, the durability against repeated pressing may be deteriorated. If the upper limit is exceeded, the crystallinity becomes too high and the toughness of the film is lost, so that the processability of the membrane switch may be deteriorated.
- the density of the film is a value measured by a floatation method at 25 ° C in a density gradient tube using an aqueous solution of calcium nitrate as a solvent.
- the base film of the present invention may be provided with a coating layer on at least one surface thereof for the purpose of improving the easy adhesion to the printing paste. .
- the coating layer is preferably made of at least one water-soluble or water-dispersible polymer resin selected from polyester resin, urethane resin, acrylic resin, and vinyl resin, and particularly preferably contains both polyester resin and acrylic resin. preferable.
- the polyester resin of the coating layer used in the present invention has a glass transition point (T g) of 0 to 100: and more preferably 10 to 90.
- the polyester resin is preferably a water-soluble or dispersible polyester, but may contain some organic solvent.
- Such a polyester resin comprises the following polybasic acid or an ester-forming derivative thereof and a polyol or an ester-forming derivative thereof.
- polybasic acid components include terephthalic acid, isophthalic acid, phthalic acid, phthalic anhydride, 2,6-naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, adipic acid, sebacic acid, Examples include trimellitic acid, pyromellitic acid, dimeric acid, 5-sodium sulfoisophthalic acid, and the like.
- a copolymer polyester resin is synthesized using two or more of these acid components.
- hydroxycarboxylic acids such as maleic acid, itaconic acid and the like and p-hydroxybenzoic acid which are unsaturated polybasic acid components can be used in a small amount.
- the polyol components include ethylene glycol, 1,4-butanediol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, xylen glycol, and dimethylolpropane.
- the polyester resin used as the coating layer is formed of, for example, these monomers, but is not limited to the above-mentioned monomers.
- the acrylic resin of the coating layer used in the present invention has a glass transition point (T g) of ⁇ 50 to 50, more preferably ⁇ 50 to 25.
- the acrylic resin is preferably acryl, which is soluble or dispersible in water, but may contain some organic solvent. Such an acryl resin can be copolymerized from the following acryl monomers.
- acrylic monomer examples include alkyl acrylate, alkyl methacrylate (alkyl groups include methyl group, ethyl group, n-propyl group, isopropyl group, n_butyl group, isobutyl group, t-butyl group, 2_ Hydroxyl-containing monomers such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and 2-hydroxypropyl methacrylate.
- An epoxy group-containing monomer such as glycidyl acrylate, dalicydyl methacrylate, or aryldylicidyl ether; acrylic acid, mesyacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, styrenesulfonic acid and salts thereof (Sodium salt, potassium salt, ammonium salt, Tertiary amine salts, etc.) or a monomer containing the same or a salt thereof; acrylamide, methylacrylamide, N-alkylacrylamide, N_alkyl methacrylamide, N, N-dialkylacrylamide, N, N-dialkyl Metalates (alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl, cyclohexyl, etc.), N-alkoxyacrylamide, N-al
- the composition used in the present invention is preferably used in the form of an aqueous coating solution such as an aqueous solution, an aqueous dispersion or an emulsion for forming a coating film.
- an aqueous coating solution such as an aqueous solution, an aqueous dispersion or an emulsion for forming a coating film.
- a resin other than the above-mentioned composition for example, a polymer having an oxazoline group, a crosslinking agent such as melamine, epoxy, and aziridine, an antistatic agent, a coloring agent, and a surfactant Agents, UV absorbers, lubricants (filaments, waxes), etc. can be added. Such a lubricant can be added as needed for the purpose of improving the slipperiness or blocking resistance of the film.
- the solid content concentration of the aqueous coating liquid is usually 20% by weight or less, and preferably 1 to 10% by weight. If the proportion is less than 1% by weight, the coatability to the polyester film is insufficient, while if it exceeds the upper limit, the stability of the paint and the appearance of the paint may be deteriorated.
- the coating layer can be firmly provided on the film by applying an aqueous coating solution to an unstretched film or a film that has been uniaxially stretched, and then stretching the film in two or one direction and heat fixing the film.
- a coating method a roll coating method, a gravure coating method, a roll brushing method, a spray method, an air-knife coating method, an impregnation method, a curtain coating method, or the like can be used alone or in combination.
- the substrate film for a membrane switch of the present invention is a biaxially oriented film mainly composed of PEN.
- This biaxially oriented film is melted at a temperature not lower than the melting point of the biaxially oriented film, and extruded from a die slit onto a casting drum adjusted to around 60 ° C. to be tightly cooled and solidified to obtain an unstretched film.
- the unstretched film can be manufactured by stretching it biaxially in the machine direction and the transverse direction, heat setting it, and relaxing it in the machine direction and the Z or transverse direction as necessary.
- Film stretching is public Known roll-type longitudinal stretching machine, infrared heating longitudinal stretching machine, ten-crib horizontal stretching machine, multi-stage stretching machine that divides these into multiple stages, tubular stretching machine, oven-type vertical stretching machine, It can be performed using a simultaneous biaxial stretching machine or the like, but is not particularly limited.
- sequential biaxial stretching or simultaneous biaxial stretching may be used as long as the refractive index in at least one of the film forming direction and the width direction can be controlled to 1.770 or more and 1.790 or less.
- the vertical stretching mechanism of the simultaneous biaxial stretching machine uses the conventional method of placing a clip in the groove of a screw to increase the interval between clips, the Pan-Yu graph method of increasing the interval between clips using a pantograph, and the like.
- the linear motor method is preferable because the film forming speed is higher than that of the screw method or the pantograph method, and the conditions such as the stretching ratio can be easily changed.
- Simultaneous biaxial stretching does not use a longitudinal stretching roller as in sequential biaxial stretching, and thus has the advantage of reducing scratches on the film surface.
- the unstretched film is generally stretched simultaneously in the machine direction and the transverse direction, there is an advantage that the control of the machine direction and the transverse direction is easier than the sequential biaxial stretching. Since these characteristics match the characteristics required for the film for a membrane switch of the present invention, simultaneous biaxial stretching can be employed in the present invention.
- Simultaneous biaxial stretching referred to in the present invention refers to stretching for simultaneously giving the orientation in the machine direction and the transverse direction of the film.
- the film is conveyed while holding both ends of the film with clips using a simultaneous biaxial stretching machine.
- a method of stretching simultaneously and a method of further stretching independently in the horizontal or vertical direction after simultaneous biaxial stretching are also included in the scope of the present invention, for example, a method of stretching simultaneously and a method of further stretching independently in the horizontal or vertical direction after simultaneous biaxial stretching.
- a PEN film melt extruded at a temperature of 280 to 330 ° C is rapidly cooled on the surface of a rotary cooling drum with a surface temperature set to 30 to 70 ° C, and the intrinsic viscosity is increased. Is 0.40 to 0.90 d1 Zg. Drying before melt extrusion is preferably performed at 160 to 190 at 4 to 7 hours.
- the ratio of the thickness of the end portion to the center portion of the unstretched film is desirably 1 or more and 10 or less, preferably 1 or more, less than 5, and more preferably 1 or more. , Less than 3. If the ratio of the thickness is less than 1 or exceeds the upper limit, film tearing or clip detachment frequently occurs, which is not preferable.
- the unstretched film is guided to a simultaneous biaxial stretching machine by gripping both ends of the film with clips, and heated to 80 to 170 ° C. in a preheating zone, followed by one step or one step.
- Simultaneous biaxial stretching with an area magnification of 9 to 20 times (longitudinal magnification of 2 to 4.5 times) is performed at 120 to 170 ° C in two or more steps.
- the film may be further biaxially stretched at an area magnification of 2 to 5 times in a temperature range of 140 to 245, in one step or in two or more steps.
- heat setting is performed in the temperature range of 190 to 250, and relaxation treatment is performed while performing heat setting if necessary or during the cooling process after the heat setting.
- a temperature range of 140 to 240 is preferable, and the relaxation treatment is performed in the vertical and horizontal directions, preferably in the range of 1 to 10% in each direction.
- the preheating temperature is preferably about 130
- the stretching temperature is about 144
- the heat setting temperature is preferably about 240.
- a polyester film is used before or after the simultaneous biaxial stretching.
- the coating of the coating agent can be preferably performed on the surface.
- the film of the present invention can be produced by ordinary sequential biaxial stretching.
- the unstretched film of PEN obtained by a known method is heated to 80 to 170 ° C in the preheating zone, 120 to 180 ° C, more preferably 125 to 180 ° C
- At 170 ° C., particularly preferably at 130 to 160 it is more preferably 3.0 to 4.5 times with an infrared heating type longitudinal stretching machine in the machine direction.
- it is stretched 3.2 to 4.2 times.
- a roll-type vertical stretching machine may be used, and in order to perform the stretching in the longitudinal stretching without difficulty, it is preferable to divide the stretching into a plurality of times and perform the multi-stage stretching.
- a desired PEN film can be obtained by performing longitudinal stretching, transverse stretching, and, if necessary, heat setting or relaxation treatment.
- the sheet is heated again to 80 to 150 ° C. in the preheating zone, and then further 120 to 180 times in the stenter and 3.0 to 4.5 times in the transverse direction.
- a more preferred transverse stretching temperature is from 125 to 170, especially from 130 to 160 ° C. Further, the more preferred transverse stretching ratio is 3.3 to 4.2 times.
- the heat setting is preferably performed at 195 to 250 for 0.3 to 50 seconds.
- a more preferred heat setting temperature is in the range of 205-245 ° C.
- the horizontal stretching may be multi-stage stretching that is divided into a plurality of stages.
- the absolute value of the difference between the melting subpeak temperatures (T sm) of the front and back surfaces of the film (I Tsm (front surface In order to make one Tsm (rear surface) I) less than 6 it is necessary to check and adjust the temperature at which the upper and lower surfaces of the film are actually heated in the heat setting zone. Adjustment here does not mean simply setting the upper and lower temperatures of the heat setting zone to the same temperature.
- the melting sub-peak temperature (Tsm) of the front and back surfaces of the film may be affected by the handling and processing properties in the membrane switch manufacturing process.
- the present invention has found that the difference has a great effect, and has solved the problem.
- the refractive index in at least one direction in the film forming direction and the width direction is 1.770 or more.
- the temperature of the upper and lower surfaces of the film in each preheating zone before longitudinal stretching and transverse stretching must be adjusted. It is better to adjust the balance.
- a good balance means that, taking into account the temperature difference between the upper and lower surfaces of the film in each stretching zone, the film is stretched in the preheating zone so that it can be stretched over the entire film thickness without difficulty. It means adjusting the temperature of the upper and lower surfaces. Therefore, it does not mean that the upper and lower temperatures of the preheating zone are simply set to the same temperature. Conventionally, much attention has been paid to the temperature of the preheating zone, but especially for thick films whose unstretched film thickness is more than 700 m or whose film thickness after uniaxial stretching is more than 300 m, Temperature greatly affects subsequent stretching.
- the temperature difference between the upper surface and the lower surface of the film of the preheating zone is preferably 8 ° C or less, more preferably. 6 or less, particularly preferably 5 mm or less.
- the temperature of the preheating zone is preferably 10'0 ° C to 16 Ot.
- the heat relaxation treatment temperature in the vertical and / or horizontal directions after the heat setting is adjusted to the upper and lower surfaces of the film. It is preferable to adjust the temperature difference within 12 within the surface, and more preferably to adjust the temperature difference within 7 or less. For example, when comparing the refractive indices of the front surface and the back surface of the film, if the heat relaxation treatment temperature on the surface side having the smaller refractive index is set to a higher value, the difference in the refractive index between the film front surface and the back surface tends to become smaller.
- the substrate film for a membrane switch of the present invention obtained in this manner has excellent performance that is hardly deteriorated (moisture heat deterioration) under a severe environment (high temperature and high humidity) in a vehicle. Therefore, the film of the present invention is preferably used in a vehicle as a film that can withstand the years of use of the vehicle. It is considered that the manifestation of the above-mentioned properties that are not easily deteriorated by wet heat is related to the extreme orientation in at least one direction.
- the substrate film for a membrane switch of the present invention exhibits excellent deformation recovery after being released from the deformation, even when the film is forcibly deformed for a long time, and is particularly good even at a high temperature of about 80 ° C. It shows a great deformation recovery. Therefore, when embedded as the base material of the membrane switch inside the seat surface of the car seat, even if the weight of the seated occupant is received, When the occupant leaves the seat, the deformation of the film recovers and always functions as a normal switch. Therefore, it is particularly preferably used as a base material for an occupant's seat sensor switch.
- the film of the present invention can be suitably used as a base film of a membrane switch used as a sensor for detecting a seating position by detecting pressure at each position of a seating surface. It is thought that the elastic strength of the film that is extremely oriented in at least one direction is involved in the development of such deformation recovery.
- the membrane film for a membrane switch of the present invention is excellent in handling properties and durability of the film.
- it is suitable as a membrane switch used in equipment in a vehicle which may be exposed to high temperatures.
- an energy dispersive X-ray micro analyzer (XMA, HORIBA EMAX-7000) was used to set a dried film sample on a scanning electron microscope (SEM, Hitachi Instrument Service S570) and connected to it. Quantitative analysis was performed at.
- IV Intrinsic viscosity
- Measurements were taken at 10 cm intervals in the longitudinal and width directions of the film using a micro-mechanical instrument (A-Ritsu Co., Ltd., product name “K-402 B”), and the film thickness at a total of 300 locations was measured. Measure. The average value of the obtained film thicknesses at 300 locations is calculated as the film thickness.
- the film was measured over a length of 2 m in both the vertical and horizontal directions at a stylus pressure of 30 g and a running speed of 25 mm / sec. Obtain a continuous thickness chart. The maximum thickness and minimum thickness are read from this chart, and the thickness variation is calculated from the following equation in combination with the above film thickness.
- Thickness variation (%) ((maximum thickness-minimum thickness) Z film thickness) X I 00
- a film sample for DSC measurement was collected from the remaining film (back side sample or front side sample), using a differential scanning calorimeter DSC 220 manufactured by Seiko Denshi Kogyo KK at a heating rate of 2 O / min, the sample amount is 10mg, and measure by the method of obtaining the sub-peak temperature under the measurement conditions in a nitrogen stream.
- a prism is brought into contact with each of the two films to determine the film refractive index in each in-plane direction. That is, using a prism coupler (Metricon's Model 2010), the refractive index in the film forming direction and the width direction at a wavelength of 633 nm (represented as nMD and nTD, respectively) are measured on the front and back surfaces of the film. Are measured respectively. In the direction where the value of the refractive index is 1.770 or more and 1.790 or less, the absolute value of the difference in the refractive index between the front surface and the back surface is determined. (7) Heat shrinkage
- the film is held in an oven set at a temperature of 20 Ot: for 10 minutes without tension, and the dimensional change before and after the heat treatment is calculated as the heat shrinkage ratio by the following formula.
- Heat shrinkage% ((L 0-L) / L 0) X 100
- L 0 is the distance between gauge points before heat treatment
- L is the distance between drift points after heat treatment
- the density of the film is measured by a flotation method at 25 ° C in a density gradient tube using an aqueous solution of calcium nitrate as a solvent.
- Streaky irregularity defects occur between 36 hours and ⁇ 2 hours after the start of film formation. Continuous film formation is generally good.
- the state of the end face after cutting or punching the film was observed, and the workability was evaluated based on the following criteria. If the evaluation was 1 or 2, the film could be used as the film of the present invention, and it was judged as acceptable.
- Pass rate% (the number of samples whose load after treatment is 90% or more of the initial load) X I 00 ⁇ : The pass rate is 95% or more, and the switch durability is extremely good.
- the pass rate is 80% or more, and the durability of the switch is generally good.
- the pass rate is less than 80%, and the durability of the switch is poor.
- the film of the present invention has the required durability.
- the overall evaluation is represented by “ ⁇ ”, “ ⁇ ”, “ ⁇ ”, and “X”. Those with a rating of “ ⁇ ” to “ ⁇ ” are passed, and those with a rating of “X” are rejected.
- PEN having an intrinsic viscosity of 0.60 d1 Zg and a Tg of 121.
- This PEN polymer is dried at 175 for 5 hours, fed to an extruder, melted at a melting temperature of 300, extruded from a die slit, and cooled and solidified on a casting drum set at a surface temperature of 55.
- An unstretched film was made. This unstretched film is stretched 3.4 times in the machine direction with 14 O :. After that, the film was biaxially stretched sequentially by a factor of 3.8 in the transverse direction at 135.
- Example 1 the same operation was repeated except that the temperature on the upper side of the film in the heat setting zone was 243, and the temperature on the lower side of the film was 238 ° C.
- Table 1 shows the physical properties, evaluation results, film forming properties, and membrane switch evaluation results of the biaxially oriented film.
- TBT tetra-n-butyl titanate
- a film was formed in the same manner as in Example 1, except that the temperature on the upper side of the film in the heat setting zone was set at 220 ° C and the temperature on the lower side of the film was set at 2.17 ° C. Table 1 shows the results.
- a film was formed in the same manner as in Example 1 except that the temperature on the upper side of the film in the heat setting zone was 240 and the temperature on the lower side of the film was 232 ° C. Table 1 shows the results
- Example 2 Example 3 Comparative Example 1 Comparative Example 2 Melting surface 3 ⁇ 4 241.3 243.4 241.3 219.9 240.2 Sub-peak temperature Backside ° c 239.2 238.2 239.2 21 7.1 232.1
- 2,6-Naphthalenediamine dimethyl nolevonate 100 parts ethylene glycol 60 parts transesterification catalyst using manganese acetate tetrahydrate 0.03 parts, average particle size 0.5 ⁇ m as lubricant the carbonate Karushiumu particles 0. 2 5 wt 0/0, the average particle diameter of 0. 2 mu 0 spherical silica force particles m. 0 6 wt 0/0, and an average particle diameter of 0. spherical silica force of 1 mu m
- the particles were added so as to contain 0.1% by weight, and a transesterification reaction was carried out according to a conventional method. Then, 0.042 parts of triethylphosphonoacetate was added to substantially terminate the ester exchange reaction.
- 0.042 parts of triethylphosphonoacetate was added to substantially terminate the ester exchange reaction.
- This unstretched film is guided to a 120 ° C preheating zone before longitudinal stretching, and heated so that the temperature difference between the upper surface and the lower surface of the film is within 4 ° C.
- the film is stretched 3.2 times in the longitudinal direction. After that, the film is guided to a preheating zone of 130 ° C before horizontal stretching, and heated so that the temperature difference between the upper surface and the lower surface of the film is within 4 ° C.
- the film was successively biaxially stretched 3.9 times in the direction, and immediately thereafter, the upper and lower surfaces of the film were heat-set at 237 ° C. for 6 seconds. After the heat-setting, the upper side temperature of the film is set to 210 ° C and the lower side temperature of the film is set to 218 ° C. Was obtained and wound up on a roll.
- a silver paste as a conductive circuit and a carbon paste as a printed contact portion (electrode) were screen-printed on the PEN substrate film, dried at 140 ° C for 20 minutes, and a switch sheet was prepared.
- a styrene / butadiene resin was used as an adhesive for bonding the two sheets and a spacer for the membrane switch.
- Table 2 shows the physical properties, evaluation results, film-forming properties, and membrane switch evaluation results of the obtained biaxially oriented film.
- Example 4 the same operation was repeated except that the temperature on the upper side of the film was set at 21 ° C and the temperature on the lower side of the film was set at 221 ° C in the heat relaxation treatment in the lateral direction after the heat setting.
- Table 2 shows the physical properties, evaluation results, film-forming properties, and membrane switch evaluation results of the obtained biaxially oriented film.
- TBT tetra-n-butyl titanate
- TE PA triethylphosphonoacetate
- Example 4 the same operation was repeated except that the film was stretched 3.3 times in the longitudinal direction and then stretched 3.4 times in the transverse direction.
- Table 2 shows the physical properties, evaluation results, film forming properties, and membrane switch evaluation results of the obtained biaxially oriented film.
- Example 4 the same operation was repeated except that the temperature on the upper side of the film was set at 225 ° C and the temperature on the lower side of the film was set at 211 ° C in the heat relaxation treatment in the lateral direction after heat setting.
- Table 2 shows the results of the evaluation of Lenwich.
- Example 4 the same operation was repeated except that the film was stretched 3.0 times in the machine direction and then 4.7 times in the transverse direction. However, many breaks occurred during film formation, and continuous film formation for more than one hour was not possible. Therefore, evaluations other than film properties were not performed.
- This unstretched film is guided to a 120 ° C preheating zone before longitudinal stretching, and heated so that the temperature difference between the upper surface and the lower surface of the film is within 4 ° C. Stretch 3.2 times in the direction. After that, the film is guided to a 130 ° C preheating zone before transverse stretching, and heated so that the temperature difference between the upper surface and the lower surface of the film is within 4 ° C.
- the film was biaxially stretched successively 9 times, and immediately thereafter, it was heat-set for 6 seconds in a heat-setting zone in which the upper temperature of the film was adjusted to 241 ° C and the lower temperature of the film was adjusted to 239 ° C. After heat-setting, the upper side temperature of the film is 215 ° C and the lower side temperature of the film is 218 ° C. And rolled it up on a roll.
- a silver paste as a conductive circuit and a carbon paste as a printed contact part (electrode) are screen-printed on the PEN substrate film, dried at 140 ° C. for 20 minutes, and a switch sheet is prepared.
- a film-like styrene-butadiene resin was used as an adhesive for bonding and a spacer for the membrane switch.
- Table 3 shows the physical properties, evaluation results, film forming properties, and membrane switch evaluation results of the obtained biaxially oriented film.
- Example 7 the same operation was repeated except that the temperature on the upper side of the film in the heat setting zone was 243 ° C and the temperature on the lower side of the film was 238 ° C.
- Table 1 shows the physical properties, evaluation results, film forming properties, and membrane switch evaluation results of the biaxially oriented film.
- TBT tetra-n-butyl titanate
- TEPA tetra-n-butyl phosphonoacetate
- the reaction product was transferred to a polymerization vessel, heated to 290 ° C, and subjected to a polycondensation reaction in a high vacuum of 100 Pa to obtain a PEN having an intrinsic viscosity of 0.62 dlZg and a Tg of 121 ° C. Got. Thereafter, the same operation as in Example 7 was repeated for drying and film formation of the PEN polymer. Table 3 shows the results.
- Example 7 Example 8 Example 9 Melting surface. C 241.3 243.4 241.3 Sub peak temperature Backside ° C 239.2 238.2 239.2
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03807965A EP1535954A4 (en) | 2002-09-05 | 2003-09-04 | BASE FILM FOR MEMBRANE SWITCH AND MEMBRANE SWITCH |
JP2004542810A JP4528126B2 (ja) | 2002-09-05 | 2003-09-04 | メンブレンスイッチ用基材フィルムおよびメンブレンスイッチ |
US10/496,986 US7022397B2 (en) | 2002-09-05 | 2003-09-04 | Base film for membrane switch and membrane switch |
AU2003261933A AU2003261933A1 (en) | 2002-09-05 | 2003-09-04 | Base film for membrane switch and membrane switch |
CNB038201046A CN1311010C (zh) | 2002-09-05 | 2003-09-04 | 薄膜开关用基材薄膜和薄膜开关 |
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JP2002-259715 | 2002-09-05 | ||
JP2002259715 | 2002-09-05 | ||
JP2002-259714 | 2002-09-05 | ||
JP2002259714 | 2002-09-05 |
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US (1) | US7022397B2 (ja) |
EP (1) | EP1535954A4 (ja) |
JP (1) | JP4528126B2 (ja) |
KR (1) | KR100958553B1 (ja) |
CN (1) | CN1311010C (ja) |
AU (1) | AU2003261933A1 (ja) |
TW (1) | TW200408531A (ja) |
WO (1) | WO2004033540A1 (ja) |
Cited By (4)
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JP2007084697A (ja) * | 2005-09-22 | 2007-04-05 | Teijin Dupont Films Japan Ltd | 二軸配向ポリエステルフィルムおよびその製造方法 |
JP2007204582A (ja) * | 2006-02-01 | 2007-08-16 | Teijin Dupont Films Japan Ltd | メンブレンスイッチ用基材フィルム |
WO2011083726A1 (ja) * | 2010-01-08 | 2011-07-14 | ダイセル化学工業株式会社 | シート状スイッチ部材 |
JP2013141792A (ja) * | 2012-01-11 | 2013-07-22 | Teijin Dupont Films Japan Ltd | 離型フィルム |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE10340644B4 (de) * | 2003-09-03 | 2010-10-07 | Polyic Gmbh & Co. Kg | Mechanische Steuerelemente für organische Polymerelektronik |
CA2663929A1 (en) * | 2006-11-21 | 2008-05-29 | Fina Technology, Inc. | Polyethylene useful for producing film and molded articles in a process which uses solid state stretching |
EP2163572B1 (en) * | 2007-05-30 | 2014-08-13 | Teijin Dupont Films Japan Limited | Biaxially oriented polyester film for automobile driving motor and electrically insulating member composed of the same |
KR101468937B1 (ko) * | 2008-09-05 | 2014-12-11 | 코오롱인더스트리 주식회사 | 폴리에스테르 필름 및 이의 제조방법 |
KR101495770B1 (ko) * | 2012-12-28 | 2015-02-25 | 현대모비스 주식회사 | 승객감지센서 및 그 제조방법 |
JP7380601B2 (ja) * | 2019-02-14 | 2023-11-15 | 東洋紡株式会社 | 二軸延伸ポリエステルフィルム |
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- 2003-09-04 US US10/496,986 patent/US7022397B2/en not_active Expired - Lifetime
- 2003-09-04 CN CNB038201046A patent/CN1311010C/zh not_active Expired - Lifetime
- 2003-09-04 AU AU2003261933A patent/AU2003261933A1/en not_active Abandoned
- 2003-09-04 KR KR1020047011050A patent/KR100958553B1/ko not_active IP Right Cessation
- 2003-09-04 JP JP2004542810A patent/JP4528126B2/ja not_active Expired - Fee Related
- 2003-09-04 WO PCT/JP2003/011303 patent/WO2004033540A1/ja active Application Filing
- 2003-09-04 EP EP03807965A patent/EP1535954A4/en not_active Withdrawn
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007084697A (ja) * | 2005-09-22 | 2007-04-05 | Teijin Dupont Films Japan Ltd | 二軸配向ポリエステルフィルムおよびその製造方法 |
JP2007204582A (ja) * | 2006-02-01 | 2007-08-16 | Teijin Dupont Films Japan Ltd | メンブレンスイッチ用基材フィルム |
WO2011083726A1 (ja) * | 2010-01-08 | 2011-07-14 | ダイセル化学工業株式会社 | シート状スイッチ部材 |
JP2013141792A (ja) * | 2012-01-11 | 2013-07-22 | Teijin Dupont Films Japan Ltd | 離型フィルム |
Also Published As
Publication number | Publication date |
---|---|
KR20050039748A (ko) | 2005-04-29 |
TWI314097B (ja) | 2009-09-01 |
US7022397B2 (en) | 2006-04-04 |
KR100958553B1 (ko) | 2010-05-17 |
TW200408531A (en) | 2004-06-01 |
EP1535954A1 (en) | 2005-06-01 |
JP4528126B2 (ja) | 2010-08-18 |
AU2003261933A1 (en) | 2004-05-04 |
US20050064140A1 (en) | 2005-03-24 |
CN1678667A (zh) | 2005-10-05 |
CN1311010C (zh) | 2007-04-18 |
JPWO2004033540A1 (ja) | 2006-02-09 |
EP1535954A4 (en) | 2007-03-14 |
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