WO2011083726A1 - シート状スイッチ部材 - Google Patents
シート状スイッチ部材 Download PDFInfo
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- WO2011083726A1 WO2011083726A1 PCT/JP2010/073688 JP2010073688W WO2011083726A1 WO 2011083726 A1 WO2011083726 A1 WO 2011083726A1 JP 2010073688 W JP2010073688 W JP 2010073688W WO 2011083726 A1 WO2011083726 A1 WO 2011083726A1
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Images
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Definitions
- the present invention relates to a sheet-like switch member used for an input part of an electric / electronic device or an optical device, and more particularly to an optical sheet-like switch member that requires transparency such as a key top sheet and a light guide sheet.
- a switch member used for an input part of an electrical / electronic device or optical device a sheet-like switch member formed of a thin film sheet, For example, a key top sheet, a key mat sheet, a light guide sheet, a reflection sheet, and the like for constituting a push button switch, a membrane switch, a sensor switch, a touch panel, etc. are widely used.
- sheet-like switch members include formability, operability (click feeling, etc.), mechanical strength (durability against repeated operations, etc.), durability (water resistance, hydrolysis resistance, etc.), printability (operation panel)
- the key top sheet used for the operation panel of a mobile phone is required to have elasticity and flexibility to be bent by being pressed by a hand. Sheets composed mainly of plastics or elastomers are used.
- Patent Document 1 discloses a thin-walled portion and a base portion made of drawn polyethylene terephthalate and a high-hardness resin having a Shore D hardness of 40 degrees or more.
- a cover member for a push button switch formed by integrating a key top portion made of the above is disclosed.
- the high-hardness resin may be selected from general resins such as silicone, urethane, epoxy, acrylic, and polyethylene terephthalate (PET).
- Patent Document 2 integrally forms a film in which a display portion curved in the same shape is printed on the upper surface side of a key top body made of a thermoplastic material molded by a mold.
- the film is a multilayer elastic film having two or more layers, and the display portion is printed on the key top body side of the multilayer elastic film to form the display portion printed layer.
- a sheet-like key top structure is disclosed.
- This document discloses a multilayer elastic film in which an elastic film composed of various thermoplastic elastomers and a base material composed of various hard thermoplastic resins are laminated.
- a key top sheet in which polyamide is laminated on both sides of a thermoplastic elastomer film is described.
- the switch structure of a light-emitting key of a thin mobile phone in recent years is a type in which a light-emitting diode (LED) light source 6 or the like illuminates from the side of the operation surface for thinning.
- a click dome 4 that is a spring member made of metal or the like is formed on the flexible printed wiring board 5, and the light from the light source 6 is guided on the click dome 4.
- a light guide sheet 3 is formed.
- an embossed key top sheet 1 and a key mat sheet 2 are laminated on the light guide sheet 3 as an operation panel (operation surface) of an illumination type key.
- the key mat sheet 2 laminated on the back surface of the key top sheet 1 comes into contact with the light guide sheet 3 and the click dome 4 is pressed. That is, in this switch structure, the key top sheet 1, the key mat sheet 2, and the light guide sheet 3 need to be bent by clicking. Furthermore, since the light from the light source 6 is guided by the light guide sheet 3 and passes through the key mat sheet 2 and the key top sheet 1, these sheets are required to have transparency. However, when these sheets are composed of the sheets of the above-mentioned literature, transparency and weather resistance are not sufficient.
- Patent Document 3 a layer containing a cyclic olefin copolymer having a glass transition temperature of 30 ° C. or lower, a synthetic polymer, a natural polymer, a metal, a metal oxide, and A multilayer material comprising a layer or a molded body made of at least one material selected from these mixtures has been proposed.
- This document describes various thermoplastic resins, thermoplastic elastomers, and thermosetting resins as synthetic polymers.
- a cyclic olefin copolymer film having a crystallinity of 1%, a glass transition temperature of 2 ° C. or 3 ° C., a melting point of 81 ° C. or 73 ° C., and an LLDPE sheet, a polyamide 6 sheet, a polyimide sheet, or an aluminum plate is thermally laminated.
- multilayer materials can be used in various fields such as films, sheets, containers, packaging materials, automobile parts, electrical / electronic parts, building materials, civil engineering materials, etc.
- the members are not described.
- JP-A-8-112822 (Claim 1, paragraph [0012]) JP 10-172379 A (Claims 1 to 3, paragraph [0012], Examples) Japanese Patent No. 3274702 (claims, paragraphs [0019] [0057], Examples)
- an object of the present invention is to provide a sheet-like switch member that is excellent in operability such as clickability (balance between elasticity, flexibility, and waist) and has high moldability.
- Another object of the present invention is to provide a sheet-like switch member having high transparency and excellent durability such as water resistance and weather resistance (particularly light resistance).
- Still another object of the present invention is to provide a sheet-like switch member having high mechanical properties such as strength, durability against repeated use, and excellent printability.
- Another object of the present invention is to provide a sheet-like switch member provided with a protective layer that can effectively protect the sheet-like member and can be easily peeled and removed without causing contamination or surface roughness.
- the present inventors have found a laminated sheet formed of a hard layer formed of a resin component and a soft layer formed of a chain olefin-cyclic olefin copolymer.
- a switch member When used as a switch member, it has been found that it has excellent operability such as clickability and high moldability, and has completed the present invention.
- the sheet-like switch member of the present invention is a sheet-like switch member used for an input part of a device, and is laminated on at least one surface of a hard layer formed of a resin component, and the hard layer, and And a soft layer formed of a chain olefin-cyclic olefin copolymer.
- the hard layer may be formed of a stretched film (particularly a stretched polyester film).
- the resin component may be at least one selected from the group consisting of a polyester resin, a polycarbonate resin, and an acrylic resin.
- the hard layer and the soft layer may be laminated via an adhesive layer.
- the adhesive layer may be formed of a two-component curable urethane resin.
- a soft layer may be formed on one surface of the hard layer, and a peelable protective layer may be formed on the soft layer.
- the protective layer may be formed of a polyester resin or an olefin resin.
- the chain olefin-cyclic olefin copolymer may have a crystallinity of 20% or less.
- the chain olefin-cyclic olefin copolymer may have a glass transition temperature of 30 ° C. or lower.
- the chain olefin-cyclic olefin copolymer may be a copolymer having an elongation at break of 500% or more and no yield point in a tensile test (film having a thickness of 100 ⁇ m) according to JIS K7127. .
- the haze of the soft layer may be 5% or less in a method (thickness: 100 ⁇ m) based on JIS K7105.
- the chain olefin-cyclic olefin copolymer is a copolymer having an ⁇ -chain C 2-4 olefin and a polycyclic olefin as polymerization components, and the molar ratio between the two is ⁇ -chain C 2.
- the sheet-like switch member of the present invention may be embossed.
- the sheet-like switch member of the present invention is used for a sheet-like switch member for forming a push button switch, a membrane switch, a sensor switch, or a touch panel (for example, a key top sheet, a key mat sheet, a light guide sheet, or a reflective sheet). it can.
- a laminated sheet formed of a hard layer formed of a resin component and a soft layer formed of a chain olefin-cyclic olefin copolymer is used as the sheet-like switch member.
- this sheet-like switch member has high transparency, is excellent in durability such as water resistance (or hydrolysis resistance) and weather resistance, and has mechanical properties such as strength and durability against repeated use. And high printability.
- the sheet-like member can be effectively protected,
- the protective layer can be easily removed without causing contamination or surface roughness.
- FIG. 1 is a schematic diagram showing a switch structure of a lighted key of a thin cellular phone.
- the sheet-like switch member of the present invention includes a hard layer formed of a resin component, and a soft layer laminated on at least one surface of the hard layer and formed of a chain olefin-cyclic olefin copolymer. .
- a hard layer formed of a resin component
- a soft layer laminated on at least one surface of the hard layer and formed of a chain olefin-cyclic olefin copolymer.
- thermoplastic resins olefin resins, cyclic olefin resins, halogen-containing resins (including fluorine resins), vinyl alcohol resins, vinyl ester resins, vinyl ether resins, (meth) acrylic resins.
- Resin styrene resin, polyester resin, polyamide resin, polycarbonate resin, thermoplastic polyurethane resin, polysulfone resin (polyethersulfone, polysulfone, etc.), polyphenylene ether resin (polymer of 2,6-xylenol, etc.) , Cellulose derivatives (cellulose esters, cellulose carbamates, cellulose ethers, etc.), silicone resins (polydimethylsiloxane, polymethylphenylsiloxane, etc.), rubbers or elastomers (polybutadiene, polyiso Diene rubber such as len, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, acrylic rubber, urethane rubber, silicone rubber, etc.), thermosetting resin (epoxy resin, unsaturated polyester resin, diallyl phthalate resin, silicone) Resin, etc.).
- These resin components can be used alone or in combination of two
- these resin components from the viewpoint of moldability and transparency, olefin resins (polypropylene, etc.), acrylic resins (polymethyl methacrylate, etc.), styrene resins (polystyrene, etc.), polyamide resins (polyamide 6) , Polyamide 66, polyamide 610, etc.), polyester resins (polyethylene terephthalate (PET), etc.), and polycarbonate resins (bisphenol A type polycarbonate, etc.) are preferred. Furthermore, these transparent resins may be acrylic resins such as polymethyl methacrylate resins, polyester resins, and polycarbonate resins because of their excellent balance of transparency, mechanical properties, heat resistance, and the like.
- the hard layer formed of the resin component is a stretched film such as a stretched polyolefin resin film (for example, a stretched polypropylene film) or a stretched styrene resin film (for example, stretched) from the viewpoint of dimensional stability or strength.
- a stretched polyolefin resin film for example, a stretched polypropylene film
- a stretched styrene resin film for example, stretched
- stretched polyester resin film for example, stretched PET film
- stretched polyamide film etc.
- These stretched films may be uniaxially stretched or biaxially stretched. From the viewpoint of improving dimensional stability, biaxial stretching may be used.
- the draw ratio can be selected from the range of about 1.1 to 20 times depending on the type of the resin component, but for example, about 1.2 to 10 times, preferably 1.3 to 6 times, more preferably 1. It may be about 5 to 6 times (particularly 2 to 4 times).
- the above-mentioned properties are maintained in a well-balanced manner, and the stretched polyester resin film is excellent in flexibility and durability required in a click operation as a switch member. Is particularly preferred.
- a polyalkylene arylate resin As the polyester resin constituting the stretched polyester resin film, a polyalkylene arylate resin is preferable.
- the polyalkylene arylate resin has, as a main component, an alkylene arylate unit, for example, at a ratio of 50 mol% or more, preferably 75 to 100 mol%, more preferably 80 to 100 mol% (particularly 90 to 100 mol%). Containing homo or copolyesters are included.
- Examples of the copolymerizable monomer constituting the copolyester include dicarboxylic acid components (for example, C 8-20 aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 2,7-naphthalenedicarboxylic acid, and 2,5-naphthalenedicarboxylic acid).
- dicarboxylic acid components for example, C 8-20 aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 2,7-naphthalenedicarboxylic acid, and 2,5-naphthalenedicarboxylic acid).
- Acid adipic acid, azelaic acid, C 4-12 alkane dicarboxylic acid such as sebacic acid, C 4-12 cycloalkane dicarboxylic acid such as 1,4-cyclohexanedicarboxylic acid, etc.
- diol component eg, ethylene glycol, propylene glycol
- butanediol C 2-10 alkanediol such as neopentyl glycol
- diethylene glycol diethylene glycol
- C 4-12 cycloalkane diols such as poly C 2-4 alkylene glycol
- 1,4-cyclohexanedimethanol such as polyethylene glycol, bisphenol And aromatic diols such as
- hydroxycarboxylic acid component e.g., p- hydroxybenzoic acid, p- hydroxyethoxy benzoic acid
- hydroxycarboxylic acid component e.g., p- hydroxybenzoic acid, p- hydroxy
- the polyalkylene arylate-series resin for example, polyethylene terephthalate, polypropylene terephthalate, poly C 2-4 alkylene terephthalate-series resin such as polybutylene terephthalate, polyethylene naphthalate, polypropylene naphthalate, poly C 2-4, such as a polybutylene naphthalate
- Examples include alkylene naphthalate resins.
- polyethylene arylate resins such as polyethylene terephthalate and polyethylene naphthalate, in particular, homopolyesters of ethylene arylate units, or ethylene arylates from the viewpoint of high dimensional stability after stretching.
- a copolyester having a unit content of 80 mol% or more (particularly 90 mol% or more) may be mentioned.
- the copolymerizable monomer constituting the copolyester include the aforementioned dicarboxylic acid component, diol component, and hydroxycarboxylic acid component.
- the average molecular weight of the polyester resin can be selected, for example, from the range of about 5,000 to 1,000,000 in terms of number average molecular weight, for example, 10,000 to 500,000, preferably 12,000 to 300,000, and more preferably about 15,000 to 100,000.
- the hard layer may have high transparency, and the total light transmittance measured according to JIS K7136 is, for example, 80 to 100%, preferably 85 to 100%, more preferably 90 to 100%. It may be a degree.
- the hard layer may contain conventional additives, for example, stabilizers such as antioxidants and heat stabilizers, plasticizers, antistatic agents, flame retardants, ultraviolet absorbers and the like.
- the thickness of the hard layer can be selected from the range of about 1 to 500 ⁇ m depending on the application, for example, 5 to 300 ⁇ m, preferably 10 to 200 ⁇ m, and more preferably about 30 to 100 ⁇ m.
- the chain olefin-cyclic olefin copolymer is a copolymer containing a chain olefin and a cyclic olefin as polymerization components.
- chain olefin examples include chain C such as ethylene, propylene, 1-butene, isobutene, 1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-hexene and 1-octene. And 2-10 olefins. These chain olefins can be used alone or in combination of two or more. Of these chain olefins, ⁇ -chain C 2-8 olefins are preferable, and ⁇ -chain C 2-4 olefins (particularly ethylene) are more preferable.
- the cyclic olefin may be any polymerizable cyclic olefin having an ethylenic double bond in the ring, and may be a monocyclic olefin (for example, cyclic C 4-12 cycloolefins such as cyclobutene, cyclopentene, cycloheptene, cyclooctene, etc. However, polycyclic olefins are preferred.
- Typical polycyclic olefins include, for example, norbornene, norbornene having a substituent (2-norbornene), a multimer of cyclopentadiene, a multimer of cyclopentadiene having a substituent, and the like.
- substituent include an alkyl group, an alkenyl group, an aryl group, a hydroxyl group, an alkoxy group, a carboxyl group, an alkoxycarbonyl group, an acyl group, a cyano group, an amide group, and a halogen atom.
- examples of the polycyclic olefin include 2-norbornene; 5-methyl-2-norbornene, 5,5-dimethyl-2-norbornene, 5-ethyl-2-norbornene, and 5-butyl-2-norbornene.
- Norbornenes having an alkyl group such as: norbornenes having an alkenyl group such as 5-ethylidene-2-norbornene; alkoxycarbonyls such as 5-methoxycarbonyl-2-norbornene and 5-methyl-5-methoxycarbonyl-2-norbornene
- Norbornenes having a group norbornenes having a cyano group such as 5-cyano-2-norbornene; norbornenes having an aryl group such as 5-phenyl-2-norbornene and 5-phenyl-5-methyl-2-norbornene; Dicyclopentadiene; 2,3-dihydro Derivatives such as cyclopentadiene, methanooctahydrofluorene, dimethanooctahydronaphthalene, dimethanocyclopentadienonaphthalene, methanooctahydrocyclopentadienonaphthalene; derivatives having substituents such as 6-
- cyclic olefins can be used alone or in combination of two or more.
- polycyclic olefins such as norbornenes are preferred.
- chain olefins especially ⁇ -chain C 2-4 olefins such as ethylene
- cyclic olefins particularly norbornene, etc.
- copolymerizable monomers include, for example, vinyl ester monomers (eg, vinyl acetate, vinyl propionate, etc.); diene monomers (eg, butadiene, isoprene, etc.); (meth) acrylic monomers Monomer [for example, (meth) acrylic acid or derivatives thereof ((meth) acrylic acid ester etc.)] etc. can be illustrated. These other copolymerizable monomers may be used alone or in combination of two or more. The content of these other copolymerizable monomers is, for example, 5 mol% or less, preferably 1 mol% or less, based on the copolymer.
- the chain olefin-cyclic olefin copolymer may be a resin obtained by addition polymerization or a resin obtained by ring-opening polymerization (such as ring-opening metathesis polymerization).
- the polymer obtained by ring-opening metathesis polymerization may be a hydrogenated hydrogenated resin.
- the chain olefin-cyclic olefin copolymer is polymerized by a conventional method, for example, ring-opening metathesis polymerization using a metathesis polymerization catalyst, addition polymerization using a Ziegler type catalyst, or addition polymerization using a metallocene catalyst (usually , Ring-opening metathesis polymerization using a metathesis polymerization catalyst) can be used.
- the degree of crystallinity of the chain olefin-cyclic olefin copolymer can be selected from the range of about 20% or less, for example, 0.1 to 20%, preferably 1 to 18%, more preferably 2 to 15% (particularly 3 ⁇ 10%).
- the glass transition temperature (Tg) of the chain olefin-cyclic olefin copolymer can be selected from a range of about 30 ° C. or less, for example, ⁇ 25 ° C. to 30 ° C., preferably ⁇ 20 ° C. to 20 ° C., more preferably ⁇ 15 About 10 ° C. to 10 ° C. (especially ⁇ 10 ° C. to 5 ° C.).
- the melting point (Tm) of the chain olefin-cyclic olefin copolymer can be selected from the range of about 50 ° C. or more, for example, 50 to 200 ° C., preferably 60 to 150 ° C., more preferably 70 to 120 ° C. (especially 75 to 110 ° C.).
- the glass transition temperature and the melting point can be controlled by adjusting the ratio of the monomer, the substituent of the monomer, the molecular weight of the polymer, and the like.
- the chain olefin-cyclic olefin copolymer in the present invention is excellent in elasticity and flexibility, and even when the elongation at break is about 500% or more in a tensile test (film having a thickness of 100 ⁇ m) based on JIS K7127. For example, it may be about 500 to 2500%, preferably about 600 to 2000%, more preferably about 800 to 1800% (particularly about 1000 to 1500%). Furthermore, since the chain olefin-cyclic olefin copolymer in the present invention exhibits elastic deformability, it is excellent in clickability (operability and durability) and does not exhibit a yield point in the tensile test.
- the number average molecular weight of the chain olefin-cyclic olefin copolymer is, for example, about 15,000 to 200,000, preferably about 20,000 to 100,000, more preferably about 30,000 to 80,000 (particularly about 40,000 to 70,000).
- the soft layer also has excellent transparency, and the haze (cloudiness value) may be, for example, 5% or less in a method (thickness 100 ⁇ m) based on JIS K7105, preferably 0.1 to 5%, More preferably, it is about 0.3 to 3% (particularly 0.5 to 2%).
- the soft layer may contain conventional additives, for example, stabilizers such as antioxidants and heat stabilizers, plasticizers, antistatic agents, flame retardants, ultraviolet absorbers and the like.
- stabilizers such as antioxidants and heat stabilizers
- plasticizers such as plasticizers, antistatic agents, flame retardants, ultraviolet absorbers and the like.
- the thickness of the soft layer can be selected from the range of about 20 to 700 ⁇ m depending on the application, and is, for example, about 20 to 600 ⁇ m, preferably about 30 to 500 ⁇ m, and more preferably about 50 to 300 ⁇ m.
- the sheet-like switch member of the present invention is not limited to two layers as long as the soft layer and the hard layer are laminated, and may be a laminate of three or more layers.
- the outer layer may be either a hard layer or a soft layer.
- a soft layer and a hard layer are usually laminated. It is a two-layer sheet.
- Such a laminated sheet can be produced by a conventional method according to the type of the resin component, and can be produced by a method such as a co-extrusion method, a melt extrusion lamination method, a heat lamination method, or a dry lamination method.
- a method such as a co-extrusion method, a melt extrusion lamination method, a heat lamination method, or a dry lamination method.
- the dry laminating method is preferable because the adhesive strength between the layers can be improved.
- a hard layer and a soft layer are laminated via an adhesive layer formed of an adhesive or a pressure-sensitive adhesive.
- Adhesive layer A conventional adhesive or pressure-sensitive adhesive can be used as the adhesive or pressure-sensitive adhesive constituting the adhesive layer.
- adhesives include vinyl adhesives (acrylic adhesives, vinyl acetate adhesives, etc.), polyolefin adhesives (anhydrous carboxylic acids such as maleic anhydride grafted polypropylene and (meth) acrylic acid grafted polypropylene).
- Modified polyolefin adhesives olefin- (meth) acrylic acid copolymer adhesives such as ethylene- (meth) acrylic acid copolymers and propylene- (meth) acrylic acid copolymers, etc.)], polyamide adhesives (Aliphatic polyamide adhesive, etc.), polyester adhesive (aliphatic polyester adhesive, etc.), urethane adhesive (thermoplastic polyurethane adhesive, two-component curable polyurethane resin, etc.), cellulose adhesive , Rubber adhesives (rubber-modified styrene adhesives such as ABS resin and MBS resin, natural rubber Adhesives, styrene - butadiene rubber based adhesive, nitrile rubber adhesive, chloroprene rubber-based adhesive, butyl rubber adhesive, etc.), etc.], and others.
- the pressure-sensitive adhesive include rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, and olefin-based pressure-sensitive adhesives (modified olefin-based
- urethane adhesives are preferable because they have high adhesiveness and flexibility.
- the urethane-based adhesive is composed of a urethane-based resin obtained by a reaction between polyisocyanates and polyols.
- the polyisocyanate is not particularly limited as long as it has two or more isocyanate groups in the molecule.
- aliphatic polyisocyanate, alicyclic polyisocyanate, araliphatic polyisocyanate, aromatic polyisocyanate, heterocyclic type examples thereof include polyisocyanates and derivatives of these polyisocyanates.
- aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, polyisocyanate derivatives, and the like are often used.
- aliphatic polyisocyanate examples include diisocyanates (eg, C 2-16 alkane diisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, 2 , 6-diisocyanatomethylcaproate), polyisocyanates having 3 or more isocyanate groups in the molecule (for example, C 6-20 alkane triisocyanate such as lysine ester triisocyanate), and the like.
- diisocyanates eg, C 2-16 alkane diisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, 2 , 6-diisocyanatomethylcaproate
- polyisocyanates having 3 or more isocyanate groups in the molecule for
- alicyclic polyisocyanates examples include diisocyanates (for example, 1,4-cyclohexane diisocyanate, isophorone diisocyanate (IPDI), 4,4′-methylenebis (cyclohexyl isocyanate), hydrogenated xylylene diisocyanate, norbornane diisocyanate, etc.) And a polyisocyanate having three or more isocyanate groups (for example, 1,3,5-trimethylisocyanatocyclohexane, 2- (3-isocyanatopropyl) -2,5-di (isocyanatomethyl) -bicyclo [2.
- diisocyanates for example, 1,4-cyclohexane diisocyanate, isophorone diisocyanate (IPDI), 4,4′-methylenebis (cyclohexyl isocyanate), hydrogenated xylylene diisocyanate, norbornane diisocyanate, etc.
- araliphatic polyisocyanate examples include diisocyanates [eg, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate, etc.], polyisocyanates having 3 or more isocyanate groups in the molecule (eg, 1,3,5- And triisocyanates such as triisocyanatomethylbenzene).
- diisocyanates eg, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate, etc.
- polyisocyanates having 3 or more isocyanate groups in the molecule eg, 1,3,5- And triisocyanates such as triisocyanatomethylbenzene.
- aromatic polyisocyanate examples include diisocyanates (for example, phenylene diisocyanate, 1,5-naphthylene diisocyanate (NDI), diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), 4,4′-toluidine diisocyanate, 4,4.
- diisocyanates for example, phenylene diisocyanate, 1,5-naphthylene diisocyanate (NDI), diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), 4,4′-toluidine diisocyanate, 4,4.
- polyisocyanates having 3 or more isocyanate groups in the molecule eg, triisocyanate such as triphenylmethane-4,4', 4 ''-triisocyanate, eg, 4,4'- And tetraisocyanates such as diphenylmethane-2,2 ′, 5,5′-tetraisocyanate.
- polyisocyanate derivatives examples include dimer, trimer, biuret, allophanate of polyisocyanate, polyisocyanate having a 2,4,6-oxadiazine trione ring which is a polymer of carbon dioxide and the polyisocyanate monomer. Isocyanates, carbodiimides, uretdiones and the like.
- aliphatic diisocyanates such as HDI
- alicyclic diisocyanates such as IPDI and hydrogenated XDI
- araliphatic diisocyanates such as XDI
- aromatic diisocyanates such as TDI, MDI and NDI
- non-yellowing type diisocyanates or derivatives thereof such as non-aromatic polyisocyanates
- aliphatic diisocyanates such as HDI
- alicyclic diisocyanates such as IPDI and hydrogenated XDI ( A trimer having an isocyanurate ring, etc.) may be used.
- These polyisocyanates may be used alone or in combination of two or more.
- polyols examples include aliphatic diols [alkanediol (ethylene glycol, propylene glycol, trimethylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,5-pentanediol, neopentyl glycol, C 2-10 alkane diol such as 1,6-hexanediol)], alicyclic diols (cycloalkane diols such as 1,4-cyclohexane diol, 1,4-cyclohexane dimethanol, hydrogenated bisphenol A, etc.
- alkanediol ethylene glycol, propylene glycol, trimethylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,5-pentanediol, neopentyl glycol, C 2-10 alkane diol such as 1,6-hexanediol
- alicyclic diols cycloal
- the polymer polyols include polyester polyols, polyether polyols, polyether ester polyols, polycarbonate polyols, polyester amide polyols, acrylic polymer polyols, and the like.
- the polyester polyol may be, for example, a reaction product of a polycarboxylic acid (or its anhydride) and a polyol, or a reaction product obtained by ring-opening addition polymerization of a lactone with respect to an initiator.
- Polycarboxylic acids include dicarboxylic acids [for example, aromatic dicarboxylic acids or anhydrides thereof (terephthalic acid, isophthalic acid, phthalic anhydride, etc.), alicyclic dicarboxylic acids or anhydrides thereof (tetrahydrophthalic anhydride, het anhydride, etc. , Hymic anhydride, etc.), aliphatic dicarboxylic acid or its anhydride (succinic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid and other C 4-20 alkanedicarboxylic acid, maleic anhydride, fumaric acid, etc.
- dicarboxylic acids for example, aromatic dicarboxylic acids or anhydrides thereof (terephthalic acid, isophthalic acid, phthalic anhydride, etc.), alicyclic dicarboxylic acids or anhydrides thereof (tetrahydrophthalic anhydride, het anhydride, etc
- polycarboxylic acids for example, trimellitic acid, trimellitic anhydride, pyromellitic anhydride, etc.
- aliphatic dicarboxylic acids or anhydrides thereof C 6-20 alkane dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, etc.
- These polycarboxylic acids can be used alone or in combination of two or more.
- the polyol include the aliphatic diol, the alicyclic diol, and the aromatic diol. These polyols can be used alone or in combination of two or more.
- lactones examples include C such as ⁇ -butyrolactone (GBL), ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -methyl- ⁇ -valerolactone, ⁇ -caprolactone, and enanthlactone (7-hydroxyheptanoic acid lactone). And 3-10 lactone. These lactones can be used alone or in combination of two or more. Of these lactones, C 4-8 lactones such as valerolactone and caprolactone are preferred.
- Initiators for lactones include, for example, water, oxirane compounds (eg, C 2-6 alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, etc.) or copolymers [eg, polyethylene glycol (PEG) , Polypropylene glycol (PPG), polytetramethylene ether glycol (PTMG), etc.], low molecular weight polyols (ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexamethylene glycol, trimethylolpropane, glycerin, penta Erythritol, bisphenol A, etc.), compounds having an amino group (for example, ethylenediamine, hexamethylenediamine, hydrazine, xylylenediamine, isophoronediamine). Which diamine compounds, polyamine compounds such as diethylenetriamine, etc.). These initiators can be used alone or in combination of
- polyether polyol examples include a ring-opening polymer of the oxirane compound (for example, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, etc.).
- polyether ester polyol examples include a polyether which is a polymer of the dicarboxylic acid (aromatic dicarboxylic acid, alicyclic dicarboxylic acid, aliphatic dicarboxylic acid, etc.) or a dialkyl ester thereof and the polyether polyol.
- examples include ester polyols.
- polycarbonate polyol examples include glycols (alkane diols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol; diethylene glycol, dipropylene glycol).
- (Poly) oxyalkylene glycols such as: 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, hydrogenated bisphenol A and other alicyclic diols; bisphenols such as bisphenol A, alkylene oxide adducts of bisphenols, etc.
- polyesteramide polyol in the reaction of the polyester polyol (polymerization of dicarboxylic acid and diol, etc.), a terminal carboxyl group-containing polyester and a diamine (for example, an aliphatic group having an amino group such as ethylenediamine, propylenediamine, hexamethylenediamine, etc.) And polyester amide polyol having a diamine as a reaction component.
- acrylic polyol a polymerizable monomer having a hydroxyl group (for example, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, etc.) and a hydroxyl group-free (meth)
- a polymerizable monomer having a hydroxyl group for example, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, etc.
- an acrylic polyol which is a polymer with an acrylic monomer (for example, (meth) acrylic acid or an ester thereof) may be used.
- polyester polyols polyols
- polyether polyols polyether polyols
- polycarbonate polyols polycarbonate polyols
- acrylic polyols are preferable from the viewpoints of flexibility and versatility.
- polyether polyols for example, the polyether polyols such as polytetramethylene ether glycol
- water resistance is preferable from the viewpoint of water resistance.
- the urethane adhesive composed of such a urethane resin may be a two-component curable polyurethane resin.
- the two-component curable polyurethane resin may be composed of a cured product of a polyisocyanate prepolymer and an active hydrogen compound.
- the polyisocyanate prepolymer is a prepolymer having a plurality of isocyanate groups (for example, a prepolymer having two or more isocyanate groups at the terminal), and includes a polyurethane prepolymer, a multimer of polyisocyanates, a base and It can be any of the curing agents.
- examples of the polyisocyanate prepolymer include a multimer of the polyisocyanates, a bullet-modified multimer of the polyisocyanates, an adduct of the polyisocyanates and the polyols, and an excessive amount of the polyisocyanates.
- Examples include polyurethane prepolymers obtained by reacting polyisocyanates. These prepolymers can be used alone or in combination of two or more.
- Preferred polyisocyanate prepolymers include, for example, multimers of the polyisocyanates (trimers, pentamers, heptamers, etc.), burette multimers of the polyisocyanates (burette-modified products), and the polyisocyanates.
- Adducts with polyols such as glycerin and trimethylolpropane
- polyurethane prepolymers of the diisocyanate and polyester polyol polyurethane prepolymers of the diisocyanate and polyether polyol, particularly the diisocyanate and polyether polyol or
- a polyurethane prepolymer with a polyester polyol is preferred.
- the number average molecular weight of the polyisocyanate prepolymer can be selected from a range of about 100 to 20,000. In the case of a curing agent, for example, it is about 100 to 10,000, preferably about 200 to 5,000, more preferably about 300 to 2,000. May be. In the case of a base, the molecular weight may be, for example, about 2,000 to 20,000, preferably 2,500 to 15,000, and more preferably about 3,000 to 10,000.
- the active hydrogen compound only has to have a plurality of active hydrogen atoms and can be cured by reacting with the polyisocyanate prepolymer.
- the active hydrogen compound include polyols exemplified in the polyisocyanate prepolymer (eg, low molecular weight polyols such as aliphatic diols), alkanolamines (eg, diethanolamine), diamines [aliphatic diamines (eg, ethylenediamine, C 2-8 alkane diamines such as propylene diamine, tetramethylene diamine and hexamethylene diamine) and alicyclic diamines (eg 1,4-cyclohexylenediamine, 3-aminomethyl-3,5,5-trimethylcyclohexyl) Amine, isophorone diamine, 4,4′-dicyclohexylmethane diamine, 1,3-bis (aminomethyl) cyclohexane, norbornane diamine, etc.
- active hydrogen compounds include polyols (such as a polymer having a hydroxyl group at a terminal in the polyurethane prepolymer exemplified as the polyisocyanate prepolymer).
- active hydrogen compounds can be used alone or in combination of two or more.
- Active hydrogen compounds include, for example, C 1-24 monoalcohols such as methanol, ethanol, isopropanol or alkylene oxide adducts thereof (for example, C 2-4 alkylene oxide adducts such as ethylene oxide), oximes such as methyl ethyl ketoxime. , Lactams such as ⁇ -caprolactam, secondary amines such as dibutylamine, and the like.
- polyols such as polyester polyol, polyether polyol, polycarbonate polyol, acrylic polyol, and polyurethane polyol are preferable, and in the case of a polyol constituting a part of the polyisocyanate prepolymer, For the same reason, polyether polyol and polyether type polyurethane polyol are particularly preferable.
- the curing agent aliphatic diols such as ethylene glycol and butylene glycol, aromatic diamines, and the like are widely used.
- the ratio of the active hydrogen compound can be selected, for example, from the range of about 0.1 to 50 parts by weight, preferably 0.5 to 10 parts by weight, more preferably 1 to 8 parts, per 100 parts by weight of the polyisocyanate prepolymer. About parts by weight (particularly 2 to 7 parts by weight).
- the thickness of the adhesive layer can be selected from the range of, for example, about 0.5 to 50 ⁇ m, for example, 1 to 20 ⁇ m, preferably 1.5 to 10 ⁇ m, and more preferably about 2 to 5 ⁇ m.
- a soft layer may be formed on one surface of the hard layer, and a peelable protective layer may be formed on the soft layer.
- This protective layer is a layer that is peeled off and removed before mounting the sheet-like switch member on the device.
- a protective layer is formed on the soft layer, handling of the sheet during unwinding and the like can be improved, and surface contamination and scratches can be prevented during distribution, storage and processing, and workability such as punching and cutting can also be achieved. improves.
- a protective layer may be formed on the hard layer.
- the protective layer may be a plastic film, but a thermoplastic resin film is preferable because it can be laminated on the soft layer by a co-extrusion method or a heat laminating method.
- the thermoplastic resin include olefin resins, acrylic resins, styrene resins, polyester resins, polyamide resins, polyurethane resins, and polycarbonate resins.
- olefin resins and polyester resins are widely used because they are excellent in moldability such as punching, and olefin resins are preferred because they are easy to coextrusion.
- the olefin-based resin may be a polymer containing an ⁇ -olefin unit as a main unit, and may be a polyethylene-based resin or a polymethylpentene-based resin, but has excellent heat resistance and releasability from a soft layer, and Polypropylene resins are preferred because they are excellent in moldability such as punching and cutting.
- the polypropylene resin may be a propylene copolymer (propylene copolymer) as well as a propylene copolymer (propylene homopolymer).
- Copolymers include propylene and ⁇ -olefins [eg, ethylene, 1-butene, 2-butene, 1-pentene, 1-hexene, 3-methylpentene, 4-methylpentene, 4-methyl-1-butene, 1 - ⁇ -C 2-16 olefins other than propylene such as hexene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, etc.
- propylene-ethylene random copolymer propylene-butene random copolymer, propylene-ethylene-butene random terpolymer.
- the polypropylene resin may be an atactic polymer or a structure having stereoregularity such as isotactic or syndiotactic. Furthermore, the polypropylene resin may be a polymer using a Ziegler catalyst or the like, or a metallocene resin using a metallocene catalyst.
- polypropylene resins can be used alone or in combination of two or more.
- a propylene homopolymer is preferable from the viewpoint of peelability from the soft layer.
- the protective layer may also contain conventional additives in the same manner as the hard layer and the soft layer.
- the thickness of the protective layer is, for example, about 10 to 300 ⁇ m, preferably about 20 to 200 ⁇ m, more preferably about 30 to 150 ⁇ m (particularly about 50 to 100 ⁇ m).
- the thickness ratio between the soft layer and the protective layer is within this range, the soft layer is effectively protected by the protective layer and has excellent peelability.
- the method for laminating the soft layer and the hard layer can use a conventional method as described above, and in particular, when the hard layer is formed of a stretched film, although a protective layer can be formed, a soft layer and a protective layer may be previously stacked by a conventional method.
- the laminating method of the soft layer and the protective layer can also be selected from a co-extrusion method, a melt extrusion laminating method, a heat laminating method, a dry laminating method, etc., but the surface of the soft layer can be smoothed and an adhesive or pressure-sensitive adhesive can be applied to the surface.
- the coextrusion method is preferable from the viewpoint that no remaining.
- a method of coextrusion a conventional method, for example, a resin composition for a layer constituting a soft layer and a protective layer, a uniaxial or biaxial type provided with a general-purpose feedblock die, a multi-manifold die or the like is used.
- a method of co-extrusion with an extruder can be used.
- the sheet-like switch member of the present invention is used as a sheet-like switch member used for an input part of various electric / electronic devices or optical devices.
- a protective layer is formed, the sheet-like switch member is used as a device.
- the protective layer is peeled off from the soft layer and used.
- the protective layer is usually processed into a desired size and used. Since the protective layer has an appropriate rigidity, the sheet-like switch member on which the protective layer is formed is excellent in formability in punching or cutting.
- the sheet-like switch member may have a surface treatment applied to the soft layer.
- the surface treatment includes printing treatment (printing treatment using heat or active energy rays such as screen printing and spray printing).
- the soft layer is formed of a chain olefin-cyclic olefin copolymer, it is excellent in printability.
- the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
- seat which comprises a soft layer, haze, a crystallinity degree, a tensile test, light resistance and hydrolysis resistance, and the embossing property of a lamination sheet were measured with the following method.
- UV irradiation experiments were performed on the plate-like test pieces obtained in the examples and comparative examples.
- a UV irradiator (“I Super UV Tester SUV-W11” manufactured by Iwasaki Electric Co., Ltd.)
- the temperature of the black panel was set to 63 ° C. and the illuminance was set to 60 mW / cm 2 for 0 hour, 50 Irradiation was performed for 100 hours and 200 hours.
- the color difference (YI) of the obtained plate-shaped test piece was calculated using a color difference meter (“Z-300A” manufactured by Nippon Denshoku Industries Co., Ltd.).
- the JIS2 dumbbell piece (width 6mm) was punched in the flow (MD) direction, and it was immersed in the hot water of 60 degreeC. After taking out for a predetermined time, water droplets on the surface were wiped off and left standing in an environment of 23 ° C./50% RH for 6 hours or more, and then the tensile test was performed. The retention after immersion was determined based on the breaking elongation before immersion in hot water.
- the polymer solution was put into 15 liters of methanol to precipitate a polymer.
- the polymer was separated by filtration and dried to obtain an ethylene-norbornene copolymer 1.
- the yield was 3.58 kg, and the polymerization activity was 52 kg / gZr (yield per gram of zirconium).
- Production Example 2 (ethylene-norbornene copolymer 2)
- ethylene and norbornene were copolymerized in the same manner as in Production Example 1 except that 0.75 mmol of bis (cyclopentadienyl) dichlorozirconium was used instead of zirconium tetrachloride.
- 3.30 kg of the obtained ethylene-norbornene copolymer 2 had a norbornene content of 10 mol%, a glass transition temperature of 2.0 ° C., and a melting point of 81 ° C.
- Production Example 3 (Ethylene-Norbornene Copolymer 3)
- ethylene and norbornene were copolymerized in the same manner as in Reference Example 1 except that the amount of the toluene solution containing 70% by weight of norbornene was changed to 1.0 liter.
- the yield was 2.50 kg
- the norbornene content of the obtained ethylene-norbornene copolymer 3 was 6.2 mol%
- the glass transition temperature was ⁇ 5.0 ° C.
- the melting point was 97 ° C.
- Example 1 The ethylene-norbornene copolymer 1 obtained in Production Example 1 was subjected to a cavity of 60 ⁇ 60 ⁇ 3 mm using a compression molding press (“Mini Test Press MP-SNL” manufactured by Toyo Seiki Seisakusho Co., Ltd.). After being held at 230 ° C. for 5 minutes, it was sandwiched between aluminum blocks and rapidly cooled, and a 60 ⁇ 60 ⁇ 3 mm plate-shaped test piece was press-molded to evaluate the glass transition temperature, melting point, crystallinity, and light resistance. .
- a compression molding press (“Mini Test Press MP-SNL” manufactured by Toyo Seiki Seisakusho Co., Ltd.). After being held at 230 ° C. for 5 minutes, it was sandwiched between aluminum blocks and rapidly cooled, and a 60 ⁇ 60 ⁇ 3 mm plate-shaped test piece was press-molded to evaluate the glass transition temperature, melting point, crystallinity, and light resistance. .
- a test piece as a soft layer and a stretched polyester film (“Ester Film E5100” manufactured by Toyobo Co., Ltd., thickness 38 ⁇ m) excellent in transparency as a hard layer
- a two-component curable urethane adhesive Mitsubishi Chemicals
- both layers were bonded together to produce a laminated sheet.
- the thickness of the adhesive layer after drying was 0.2 ⁇ m.
- Example 2 A plate-like test piece, a film-like test piece, and a laminated sheet were produced in the same manner as in Example 1 except that the ethylene-norbornene copolymer 2 was used instead of the ethylene-norbornene copolymer 1.
- Example 3 A plate-like test piece, a film-like test piece, and a laminated sheet were prepared in the same manner as in Example 1 except that the ethylene-norbornene copolymer 3 was used instead of the ethylene-norbornene copolymer 1.
- Comparative Example 1 A plate-shaped test piece, a film-shaped test piece, and a laminated sheet were prepared in the same manner as in Example 1 except that thermoplastic polyurethane (“Elastollan 1190ATR” manufactured by BASF Japan) was used instead of the ethylene-norbornene copolymer 1. Produced.
- thermoplastic polyurethane “Elastollan 1190ATR” manufactured by BASF Japan
- Comparative Example 2 A plate-like test piece, a film-like test piece, and a laminated sheet were used in the same manner as in Example 1 except that a styrene elastomer resin (“Septon 2104” manufactured by Kuraray Co., Ltd.) was used instead of the ethylene-norbornene copolymer 1. Was made.
- a styrene elastomer resin (“Septon 2104” manufactured by Kuraray Co., Ltd.) was used instead of the ethylene-norbornene copolymer 1.
- Comparative Example 3 A plate-shaped test piece, a film-shaped test piece, and a laminated sheet were used in the same manner as in Example 1 except that a polyester elastomer (“Perprene P70B” manufactured by Toyobo Co., Ltd.) was used instead of the ethylene-norbornene copolymer 1. Was made.
- a polyester elastomer (“Perprene P70B” manufactured by Toyobo Co., Ltd.) was used instead of the ethylene-norbornene copolymer 1.
- Comparative Example 4 In place of the ethylene-norbornene copolymer 1, an ethylene-norbornene copolymer ("TOPAS 8007" manufactured by Topas Advanced Polymers GmbH, a norbornene content of 36 mol%) was used in the same manner as in Example 1, except that a plate-like test piece was used. A film-like test piece and a laminated sheet were prepared.
- TOPAS 8007 ethylene-norbornene copolymer manufactured by Topas Advanced Polymers GmbH, a norbornene content of 36 mol%) was used in the same manner as in Example 1, except that a plate-like test piece was used. A film-like test piece and a laminated sheet were prepared.
- Comparative Example 5 A plate-like test piece, a film-like test piece, and a laminate were prepared in the same manner as in Example 1 except that linear low-density polyethylene (“SP2320” manufactured by Prime Polymer Co., Ltd.) was used instead of the ethylene-norbornene copolymer 1. A sheet was produced.
- SP2320 linear low-density polyethylene
- Tables 1 to 4 show the evaluation results of the plate-like test pieces, film-like test pieces, and laminated sheets obtained in Examples and Comparative Examples.
- the films and laminated sheets of the examples are excellent in various properties, whereas the films and laminated sheets of the comparative examples have strength, light resistance, hydrolysis resistance, embossing. Processability cannot be compatible.
- the sheet-like switch member of the present invention can be used as a switch member for various electric / electronic devices or optical devices such as portable devices, home appliances, and control devices.
- a sheet-like switch member of a push button switch (or operation panel) a membrane switch, a sensor switch, or a touch panel of a mobile phone, gaming device, mobile device, car navigation system, clock, calculator, television, personal computer, etc. Available.
- the sheet-like switch member includes a key top sheet, a key mat sheet, a light guide plate, a reflection plate, a retardation plate, a polarizing plate, a viewing angle expansion plate, a diffusion plate, an alignment film, and a brightness enhancement plate for constituting a switch or an operation panel. It may be.
- key top sheets key mat sheets, light guide sheets (light guide plates), and reflective sheets (reflector plates) are widely used.
- the light guide sheet or the reflective sheet is disposed on the back side of the key top sheet of a mobile phone, for example.
- seat etc. which are provided and contact the back surface of a keytop sheet
- the sheet-like switch member of the present invention is excellent in transparency and weather resistance, the key is used in an operation panel such as a mobile phone, a game machine, a mobile device, and a touch panel. It can be effectively used for a top sheet (for example, a key top sheet of a mobile phone) and a light guide sheet.
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- Engineering & Computer Science (AREA)
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- Laminated Bodies (AREA)
- Push-Button Switches (AREA)
Abstract
Description
樹脂成分としては、例えば、熱可塑性樹脂[オレフィン系樹脂、環状オレフィン系樹脂、ハロゲン含有樹脂(フッ素系樹脂を含む)、ビニルアルコール系樹脂、ビニルエステル系樹脂、ビニルエーテル系樹脂、(メタ)アクリル系樹脂、スチレン系樹脂、ポリエステル系樹脂、ポリアミド系樹脂、ポリカーボネート系樹脂、熱可塑性ポリウレタン樹脂、ポリスルホン系樹脂(ポリエーテルスルホン、ポリスルホンなど)、ポリフェニレンエーテル系樹脂(2,6-キシレノールの重合体など)、セルロース誘導体(セルロースエステル類、セルロースカーバメート類、セルロースエーテル類など)、シリコーン樹脂(ポリジメチルシロキサン、ポリメチルフェニルシロキサンなど)など]、ゴム又はエラストマー(ポリブタジエン、ポリイソプレンなどのジエン系ゴム、スチレン-ブタジエン共重合体、アクリロニトリル-ブタジエン共重合体、アクリルゴム、ウレタンゴム、シリコーンゴムなど)、熱硬化性樹脂(エポキシ樹脂、不飽和ポリエステル樹脂、ジアリルフタレート樹脂、シリコーン樹脂など)などが挙げられる。これらの樹脂成分は、単独で又は二種以上組み合わせて使用できる。
鎖状オレフィン-環状オレフィン共重合体は、鎖状オレフィンと環状オレフィンとを重合成分として含む共重合体である。
接着層を構成する接着剤又は粘着剤としては、慣用の接着剤又は粘着剤を利用できる。接着剤としては、例えば、ビニル系接着剤(アクリル系接着剤、酢酸ビニル系接着剤など)、ポリオレフィン系接着剤[無水マレイン酸グラフトポリプロピレンや(メタ)アクリル酸グラフトポリプロピレンなどの(無水)カルボン酸変性ポリオレフィン系接着剤、エチレン-(メタ)アクリル酸共重合体やプロピレン-(メタ)アクリル酸共重合体等のオレフィン-(メタ)アクリル酸共重合体系接着剤など)など]、ポリアミド系接着剤(脂肪族ポリアミド系接着剤など)、ポリエステル系接着剤(脂肪族ポリエステル系接着剤など)、ウレタン系接着剤(熱可塑性ポリウレタン系接着剤、二液硬化型ポリウレタン系樹脂など)、セルロース系接着剤、ゴム系接着剤(ABS樹脂やMBS樹脂などのゴム変性スチレン系接着剤、天然ゴム系接着剤、スチレン-ブタジエンゴム系接着剤、ニトリルゴム系接着剤、クロロプレンゴム系接着剤、ブチルゴム系接着剤など)など]などが例示できる。粘着剤としては、例えば、ゴム系粘着剤、アクリル系粘着剤、オレフィン系粘着剤(変性オレフィン系粘着剤など)などが挙げられる。
本発明のシート状スイッチ部材において、硬質層の一方の面に軟質層が形成され、かつこの軟質層の上に剥離可能な保護層が形成されていてもよい。この保護層は、シート状スイッチ部材を機器に装備するまでに剥離して除去される層である。軟質層に保護層を形成すると、巻き出しなどにおけるシートの取り扱い性が向上し、かつ流通、保存、加工過程における表面の汚れや擦傷などを防止できるとともに、打ち抜き加工や切断加工などの加工性も向上する。硬質層の汚れ防止や傷つき防止が求められる場合には、硬質層に保護層を形成してもよい。
本発明のシート状スイッチ部材において、軟質層と硬質層との積層方法は、前述のように、慣用の方法を利用でき、特に、硬質層が延伸フィルムで形成されている場合、ドライラミネート法により積層できるが、保護層を形成する場合、予め、軟質層と保護層とを慣用の方法により積層してもよい。軟質層と保護層との積層方法も、共押出法、溶融押出ラミネート法、熱ラミネート法、ドライラミネート法などから選択できるが、軟質層の表面を平滑にでき、かつ表面に接着剤や粘着剤などが残存しない点から、共押出法が好ましい。共押出の方法としては、慣用の方法、例えば、軟質層及び保護層を構成する層のための樹脂組成物を、汎用のフィードブロック付きダイやマルチマニホールドダイ等を備えた単軸又は2軸の押出機で共押出する方法を利用できる。
示差走査熱量計(セイコー電子工業(株)製「DSC6200」)を用い、窒素気流下、昇温速度10℃/分で測定を行った。
実施例及び比較例で得られたフィルム状試験片について、JIS K 7136に準拠して、ヘーズメーター(日本電色工業(株)製、NDH-500)を用いて、ヘーズを測定した。
実施例1~3及び比較例4~5で得られたプレート状試験片について、X線回折装置(XRD、(株)リガク製「RINT1500」)を用いて広角X線測定を行った。詳しくは、CuKαを用いて2θ=0°~60°の範囲で回折ピーク測定を行った。なお、Topas Advanced Polymers GmbH製「TOPAS5013」の熱プレス品を結晶性ゼロの対照サンプルとして用いた。対照サンプルは、60×60×3mmのキャビティーの中230℃で5分間保持した後、アルミブロックに挟み込み急冷してプレートにした。この対照サンプルから得られる非晶ハローと、前記プレート状試験片から得られるスペクトルの差から結晶化度を算出した。
実施例及び比較例で得られたフィルム状試験片について、流れ(MD)方向にJIS2号ダンベル片(幅6mm)を打ち抜き、23℃/50%RH、引張速度500mm/分で引張試験を行った。
実施例及び比較例で得られたプレート状試験片について、UV照射実験を行った。UV照射機(岩崎電気(株)製「アイスーパーUVテスターSUV-W11」)を用いて、黒色パネル(Black panel)の温度を63℃、照度は60mW/cm2に設定し、0時間、50時間、100時間、200時間の照射を行った。その後、得られたプレート状試験片の色差(YI)を色差計(日本電色工業(株)製「Z-300A」)を用いて算出した。
実施例及び比較例で得られたフィルム状試験片について、流れ(MD)方向にJIS2号ダンベル片(幅6mm)を打ち抜き、60℃の熱水に浸漬した。所定時間後に取り出し、表面の水滴をふき取り、23℃/50%RHの環境で6時間以上静置した後、前記引張試験を行った。熱水浸漬前の破断伸度を基準に、浸漬後の保持率を求めた。
実施例及び比較例で得られた積層シートを、自動真空包装機(新醍醐鉄工所社製「MODEL TGF」)を用いて、エンボス加工性を調べた。20mmφの円形キャビティーの深さ(絞り高さ)を3、5、10mmに変化させ、成形温度を120℃に固定し、成形時の伸び、偏肉・破れの有無を以下の基準で確認した。
△:少々偏肉あり
×:偏肉・破れあり。
窒素雰囲気下、室温において30リットルのオートクレーブに、トルエン15リットル、トリイソブチルアルミニウム(TIBA)15ミリモル、四塩化ジルコニウム0.75ミリモル、テトラキス(ペンタフルオロフェニル)硼酸アニリニウム0.75ミリモルをこの順番に投入し、続いてノルボルネンを70重量%含有するトルエン溶液1.5リットルを加えた。50℃に昇温した後、エチレン分圧が5kgf/cm2になるように、連続的にエチレンを導入しつつ、60分間の反応を行った。反応終了後ポリマー溶液を15リットルのメタノール中に投入し、ポリマーを析出させた。このポリマーを濾別、乾燥し、エチレン-ノルボルネン共重合体1を得た。収量は3.58kg、重合活性は52kg/gZr(ジルコニウム1g当りの収量)であった。
製造例1において、四塩化ジルコニウムの代わりにビス(シクロペンタジエニル)ジクロロジルコニウム0.75ミリモルを用いた以外は、製造例1と同様にエチレンとノルボルネンとの共重合を行った。その結果3.30kg、得られたエチレン-ノルボルネン共重合体2のノルボルネン含量は10モル%、ガラス転移温度は2.0℃、融点は81℃であった。
製造例1において、ノルボルネン70重量%含有するトルエン溶液の量を1.0リットルに変えた以外は、参考例1と同様にエチレンとノルボルネンとの共重合を行った。その結果、収量は2.50kg、得られたエチレン-ノルボルネ共重合体3のノルボルネン含量は6.2モル%、ガラス転移温度は-5.0℃、融点は97℃であった。
製造例1で得られたエチレン-ノルボルネン共重合体1を、圧縮成形用プレス機((株)東洋精機製作所製「ミニテストプレス MP-SNL」)を用いて、60×60×3mmのキャビティーの中に230℃で5分間保持した後、アルミブロックに挟み込み急冷して、60×60×3mmのプレート状試験片をプレス成形し、ガラス転移温度、融点、結晶化度、耐光性を評価した。
エチレン-ノルボルネン共重合体1の代わりに、エチレン-ノルボルネン共重合体2を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
エチレン-ノルボルネン共重合体1の代わりに、エチレン-ノルボルネン共重合体3を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
エチレン-ノルボルネン共重合体1の代わりに、熱可塑性ポリウレタン(BASFジャパン社製「エラストラン1190ATR」)を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
エチレン-ノルボルネン共重合体1の代わりに、スチレン系エラストマー樹脂((株)クラレ製「セプトン2104」)を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
エチレン-ノルボルネン共重合体1の代わりに、ポリエステル系エラストマー(東洋紡績(株)製「ペルプレンP70B」)を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
エチレン-ノルボルネン共重合体1の代わりに、エチレン-ノルボルネン共重合体(Topas Advanced Polymers GmbH製「TOPAS8007」、ノルボルネン含量36モル%)を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
エチレン-ノルボルネン共重合体1の代わりに、直鎖低密度ポリエチレン((株)プライムポリマー製「SP2320」)を用いる以外は実施例1と同様にして、プレート状試験片、フィルム状試験片、積層シートを作製した。
2…キーマットシート
3…導光シート
4…クリックドーム
5…フレキシブルプリント配線板
6…光源
Claims (17)
- 機器の入力部に利用されるシート状スイッチ部材であって、樹脂成分で形成された硬質層と、前記硬質層の少なくとも一方の面に積層され、かつ鎖状オレフィン-環状オレフィン共重合体で形成された軟質層とを含むシート状スイッチ部材。
- 硬質層が延伸フィルムで形成されている請求項1記載のシート状スイッチ部材。
- 樹脂成分が、ポリエステル系樹脂、ポリカーボネート系樹脂及びアクリル系樹脂からなる群から選択された少なくとも一種である請求項1記載のシート状スイッチ部材。
- 硬質層が延伸ポリエステルフィルムで形成されている請求項1~3のいずれかに記載のシート状スイッチ部材。
- 硬質層と軟質層とが接着層を介して積層している請求項1~4のいずれかに記載のシート状スイッチ部材。
- 接着層が二液硬化型ウレタン系樹脂で形成されている請求項5記載のシート状スイッチ部材。
- 硬質層の一方の面に軟質層が形成され、かつこの軟質層の上に剥離可能な保護層が形成されている請求項1~6のいずれかに記載のシート状スイッチ部材。
- 保護層がポリエステル系樹脂又はオレフィン系樹脂で形成されている請求項7記載のシート状スイッチ部材。
- 鎖状オレフィン-環状オレフィン共重合体の結晶化度が20%以下である請求項1~8のいずれかに記載のシート状スイッチ部材。
- 鎖状オレフィン-環状オレフィン共重合体のガラス転移温度が30℃以下である請求項1~9のいずれかに記載のシート状スイッチ部材。
- 鎖状オレフィン-環状オレフィン共重合体が、JIS K7127に準拠した引張試験(厚み100μmのフィルム)において、破断伸度が500%以上で、かつ降伏点を示さない請求項1~10のいずれかに記載のシート状スイッチ部材。
- 軟質層のヘーズが、JIS K7105に準拠した方法(厚み100μm)において、5%以下である請求項1~11のいずれかに記載のシート状スイッチ部材。
- 鎖状オレフィン-環状オレフィン共重合体が、α-鎖状C2-4オレフィンと多環式オレフィンとを重合成分とする共重合体であり、両者のモル比が、α-鎖状C2-4オレフィン/多環式オレフィン=80/20~99/1である請求項1~12のいずれかに記載のシート状スイッチ部材。
- 軟質層と硬質層との厚み比が、軟質層/硬質層=1/1~10/1である請求項1~13のいずれかに記載のシート状スイッチ部材。
- エンボス加工されている請求項1~14のいずれかに記載のシート状スイッチ部材。
- 押しボタンスイッチ、メンブレンスイッチ、センサースイッチ又はタッチパネルを形成するための部材である請求項1~15のいずれかに記載のシート状スイッチ部材。
- キートップシート、キーマットシート、導光シート又は反射シートである請求項16記載のシート状スイッチ部材。
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KR1020127020745A KR20120125281A (ko) | 2010-01-08 | 2010-12-28 | 시트상 스위치 부재 |
CN2010800607851A CN102782789A (zh) | 2010-01-08 | 2010-12-28 | 片状开关构件 |
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JP2010003231A JP2011142053A (ja) | 2010-01-08 | 2010-01-08 | シート状スイッチ部材 |
JP2010-003231 | 2010-01-08 |
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PCT/JP2010/073688 WO2011083726A1 (ja) | 2010-01-08 | 2010-12-28 | シート状スイッチ部材 |
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JP (1) | JP2011142053A (ja) |
KR (1) | KR20120125281A (ja) |
CN (1) | CN102782789A (ja) |
TW (1) | TW201139142A (ja) |
WO (1) | WO2011083726A1 (ja) |
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US10381177B2 (en) | 2016-03-14 | 2019-08-13 | Citizen Electronics Co., Ltd. | Push switch, method of manufacturing push switch, and electronic device including push switch |
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- 2010-12-28 KR KR1020127020745A patent/KR20120125281A/ko not_active Withdrawn
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Also Published As
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JP2011142053A (ja) | 2011-07-21 |
TW201139142A (en) | 2011-11-16 |
KR20120125281A (ko) | 2012-11-14 |
CN102782789A (zh) | 2012-11-14 |
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