WO2010004678A1 - 電子ペーパーの製造方法、及び電子ペーパー形成工程用両面粘着テープ - Google Patents
電子ペーパーの製造方法、及び電子ペーパー形成工程用両面粘着テープ Download PDFInfo
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- WO2010004678A1 WO2010004678A1 PCT/JP2009/002194 JP2009002194W WO2010004678A1 WO 2010004678 A1 WO2010004678 A1 WO 2010004678A1 JP 2009002194 W JP2009002194 W JP 2009002194W WO 2010004678 A1 WO2010004678 A1 WO 2010004678A1
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- 125000004494 ethyl ester group Chemical group 0.000 description 1
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- 239000003063 flame retardant Substances 0.000 description 1
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- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
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- 125000005843 halogen group Chemical group 0.000 description 1
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- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
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- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
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- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
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- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- ZQXSMRAEXCEDJD-UHFFFAOYSA-N n-ethenylformamide Chemical class C=CNC=O ZQXSMRAEXCEDJD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
- H01L27/1266—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
-
- 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
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
-
- 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
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2848—Three or more layers
Definitions
- the present invention relates to a method for producing electronic paper expected as a next-generation display device, and a double-sided pressure-sensitive adhesive tape for an electronic paper forming process used in the method for producing electronic paper.
- Patent Document 1 As a means of paperless, for example, use of a display can be mentioned, but the display is difficult to carry and breaks when dropped. In addition, a problem is that a power supply is required during display and it takes time to start up. Thus, electronic paper has attracted attention as a next-generation display device (Patent Document 1).
- the electronic paper can be displayed without a power source after input, and the startup time is zero. In addition, it is light and thin, can be bent, and is not easily broken when dropped. Furthermore, it is a display that can be rewritten while having a clear display, allowing a plurality of pages to be freely viewed, and having literally “paper-like” portability, visibility, and flexibility.
- Electronic paper has a structure in which a display layer (front panel) having a function of displaying images and characters and a driver layer for controlling the display layer are bonded together.
- a thin film transistor hereinafter sometimes referred to as “TFT” (Thin Film Transistor)
- TFT Thin Film Transistor
- it can be obtained by forming a TFT on a support film.
- a support film is temporarily fixed to a support plate with wax or an adhesive, and then a TFT is formed on the support film to produce a driver layer, which is further displayed on the driver layer.
- Many methods of laminating layers have been used.
- the thickness of the support film is particularly important in pursuing the lightness, thinness, and flexibility of electronic paper, and it is preferable that the thickness is thinner. That is, even if a thin support film is used, TFTs can be formed without wrinkles on the support film, and an electronic paper can be formed by laminating a display layer. At present, no electronic paper manufacturing method has been found.
- an object of the present invention is to form a TFT without forming wrinkles on a support film even when a thin support film is used, and to form an electronic paper by laminating a display layer.
- An object of the present invention is to provide an electronic paper manufacturing method that does not require a cleaning step.
- the present inventors have obtained a driver layer by forming a TFT on the support film in a state where the support film is temporarily fixed with a double-sided adhesive tape, and further, the driver layer By laminating a display layer having an image display function on top, even if the electronic paper support film is thinned, a driver layer can be obtained by easily forming TFTs without causing wrinkles in the support film.
- the driver layer and the display layer can be bonded together without any wrinkles, and the double-sided adhesive tape can be peeled off without leaving glue after the electronic paper is formed, and the back side of the electronic paper is washed after peeling
- the present invention has been completed by finding out that there is no need to do so.
- the present invention provides a driver layer by forming a thin film transistor on the electronic paper support film in a state where the electronic paper support film is temporarily fixed to a support plate with a double-sided adhesive tape, and further displays an image on the driver layer.
- an electronic paper manufacturing method including an electronic paper forming step of bonding a display layer having a function.
- the electronic paper forming step it is preferable to have a step of peeling the electronic paper from the support plate.
- At least one surface is preferably a heat-peelable pressure-sensitive adhesive layer surface, and in particular, a heat-peelable double-sided pressure-sensitive adhesive having a heat-peelable pressure-sensitive adhesive layer containing thermally expandable microspheres on both surfaces of the base material layer.
- a tape is preferred.
- the present invention also provides a double-sided pressure-sensitive adhesive tape for an electronic paper forming process used in the above-described electronic paper manufacturing method.
- the electronic paper support film is temporarily fixed with the double-sided adhesive tape, even if a thin electronic paper support film is used, the electronic paper support film is easily wrinkled.
- a TFT can be formed without any problem.
- the electronic paper support film can be easily bonded without wrinkles.
- the electronic paper can be easily and cleanly peeled off from the double-sided adhesive tape used for temporary fixing, and the forming process and the peeling process can be automated. It is.
- FIG. 1 is a schematic cross-sectional view showing an example of a double-sided pressure-sensitive adhesive tape used in the method for producing electronic paper according to the present invention.
- Adhesive layers 3A and 3B are provided on both surfaces of a base material layer 1, and the pressure-sensitive adhesive layer A separator 4 is laminated on the top.
- FIG. 2 is a schematic cross-sectional view showing another example of the double-sided pressure-sensitive adhesive tape used in the method for producing electronic paper according to the present invention, and is adhered to both surfaces of the base material layer 1 via rubbery organic elastic layers 2A or 2B.
- Adhesive layers 3A and 3B are provided, and a separator 4 is laminated on the adhesive layer.
- FIG. 3 is a schematic view (cross-sectional view) showing an example of a method for producing electronic paper according to the present invention.
- the electronic paper manufacturing method shown in FIG. 3 includes the following steps. That is, 1. One side of the double-sided pressure-sensitive adhesive tape 5 is bonded to the support plate 6. 2. An electronic paper support film 7 is bonded to the opposite surface of the double-sided pressure-sensitive adhesive tape 5 to which the support plate 6 is bonded. 3. A TFT 8 is formed on the bonded electronic paper support film 7. 4). A display layer (front panel) 9 is bonded onto the electronic paper support film 7 on which the TFT 8 is formed. 5). Heat treatment is performed to expand and / or foam the pressure-sensitive adhesive layers 3A and 3B of the double-sided pressure-sensitive adhesive tape 5, and the obtained electronic paper 10 and the support plate 6 are peeled off.
- the method for producing an electronic paper according to the present invention includes a step of forming a thin film transistor on the electronic paper support film in a state where the electronic paper support film is temporarily fixed to a support plate with a double-sided adhesive tape, and further obtaining the driver layer.
- the double-sided pressure-sensitive adhesive tape of the present invention only needs to be peelable from the electronic paper and the support plate.
- the double-sided pressure-sensitive adhesive tape of the present invention is preferably a double-sided pressure-sensitive adhesive tape with a base material layer from the viewpoints of handling properties, workability, and the like.
- the double-sided pressure-sensitive adhesive tape of the present invention preferably has a rubbery organic elastic layer in addition to the above-mentioned pressure-sensitive adhesive layer and base material layer.
- the adhesive surface of the double-sided pressure-sensitive adhesive tape of the present invention may be protected with a separator (release liner) adhered until use.
- the double-sided pressure-sensitive adhesive tape of the present invention has pressure-sensitive adhesive layers on both sides of the pressure-sensitive adhesive tape.
- the pressure-sensitive adhesive layer include a pressure-sensitive adhesive layer that does not contain heat-expandable microspheres, an active energy ray-curable pressure-sensitive adhesive layer, and a heat-peelable pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape of the present invention is different on one surface (for example, a surface to be attached to an electronic paper support film) and the other surface (for example, a surface to be attached to a support plate).
- the pressure-sensitive adhesive layer may be included, or the same type of pressure-sensitive adhesive layer may be included.
- the pressure-sensitive adhesive layer on one surface for example, the surface to be bonded to the electronic paper support film
- the pressure-sensitive adhesive layer on the other surface for example, the surface to be bonded to the support plate
- thermal peeling Type pressure-sensitive adhesive layer / active energy ray-curable pressure-sensitive adhesive layer for example, thermal peeling Type pressure-sensitive adhesive layer / active energy ray-curable pressure-sensitive adhesive layer, heat-peelable pressure-sensitive adhesive layer / pressure-sensitive adhesive layer, heat-peelable pressure-sensitive adhesive layer / heat-peelable pressure-sensitive adhesive layer, active energy ray-curable pressure-sensitive adhesive layer /
- thermal peeling Type pressure-sensitive adhesive layer / active energy ray-curable pressure-sensitive adhesive layer for example, thermal peeling Type pressure-sensitive adhesive layer / active energy ray-curable pressure-sensitive adhesive layer, heat-peelable pressure-sensitive adhesive layer / pressure-sensitive adhesive layer, heat-peelable pressure-sensitive adhesive layer / heat-peelable pressure-sensitive adhesive layer
- a heat-peelable double-sided pressure-sensitive adhesive tape in which the pressure-sensitive adhesive layer on at least one surface (particularly the surface to be attached to the electronic paper support film) is a heat-peelable pressure-sensitive adhesive layer is preferable.
- the heat-releasable double-sided pressure-sensitive adhesive tape whose both surfaces are heat-releasable pressure-sensitive adhesive layers is easy to adjust the adhesive force and requires adhesive force. In such a situation, it is possible to exert a strong adhesive force, and when unnecessary, it is preferable in that the adhesive force can be remarkably reduced by a simple method.
- the heat-peelable pressure-sensitive adhesive layer contains a pressure-sensitive adhesive for imparting tackiness, and a heat-expandable microsphere (microcapsule) for imparting thermal expansibility. Since the microspheres expand and / or foam and the adhesion area between the adherend and the pressure-sensitive adhesive layer is remarkably reduced, the adhesive force can be rapidly reduced. Thereby, it is possible to easily peel off by heating when peeling is required while having strong adhesiveness in an unheated state. Note that the microencapsulated foaming agent can stably exhibit good peelability.
- the pressure-sensitive adhesive is preferably one that does not restrain the expansion and / or foaming of the heat-expandable microspheres as much as possible during heating.
- a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a vinyl alkyl ether pressure-sensitive adhesive , Silicone adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, styrene-diene block copolymer adhesives, and these adhesives were blended with a hot-melt resin having a melting point of about 200 ° C. or less.
- One or a combination of two or more known pressure-sensitive adhesives such as a creep property-improving pressure-sensitive adhesive can be used (for example, Japanese Patent Laid-Open Nos.
- the adhesive is a crosslinking agent (eg, polyisocyanate, alkyl etherified melamine compound, etc.), tackifier (eg, rosin derivative resin, polyterpene resin, petroleum resin, oil) Suitable additives such as a soluble phenol resin), a plasticizer, a filler, and an anti-aging agent.
- a crosslinking agent eg, polyisocyanate, alkyl etherified melamine compound, etc.
- tackifier eg, rosin derivative resin, polyterpene resin, petroleum resin, oil
- Suitable additives such as a soluble phenol resin
- a plasticizer e.g., a plasticizer, a filler, and an anti-aging agent.
- the pressure-sensitive adhesive is a rubber-based pressure-sensitive adhesive based on natural rubber or various synthetic rubbers; (meth) acrylic acid alkyl esters (for example, methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, Isobutyl ester, s-butyl ester, t-butyl ester, pentyl ester, hexyl ester, heptyl ester, octyl ester, 2-ethylhexyl ester, isooctyl ester, isodecyl ester, dodecyl ester, tridecyl ester, pentadecyl ester, hexa decyl ester, heptadecyl ester, octadecyl ester, nonadecyl ester, Accession used as monomer components one or more of C, such as 1-20 alky
- the acrylic polymer may be mixed with other monomer components copolymerizable with the (meth) acrylic acid alkyl ester as necessary for the purpose of modifying cohesion, heat resistance, crosslinkability, and the like. Corresponding units may be included.
- monomer components include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; maleic anhydride, itaconic anhydride Acid anhydride monomers such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, hydroxyhexyl (meth) acrylate, hydroxyoctyl (meth) acrylate, (meth) Hydroxyl group-containing monomers such as hydroxydecyl acrylate, hydroxylauryl (meth) acryl
- (Meta) Acry Acid alkoxyalkyl monomers maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, N-phenylmaleimide; N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N -Itacimide monomers such as octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, N-laurylitaconimide; N- (meth) acryloyloxymethylenesuccinimide, N- (meth) acryloyl-6-oxy Succinimide monomers such as hexamethylene succinimide and N- (meth) acryloyl-8-oxyoctamethylene succinimide; vinyl acetate, vinyl propionate, N-vinyl pyrrolide ,
- crosslinking agent When a crosslinking agent is added to the adhesive component (base polymer), the addition amount is preferably 0.01 to 10 parts by weight, more preferably 0.01 to 8 parts by weight with respect to 100 parts by weight of the base polymer. Part.
- crosslinking agents such as an isocyanate type crosslinking agent, an epoxy type crosslinking agent, a melamine type crosslinking agent, a thiuram type crosslinking agent, a resin type crosslinking agent, a metal chelate, can be used.
- a more preferable pressure-sensitive adhesive has a dynamic elastic modulus in the range of 5000 to 1,000,000 Pa from room temperature to 150 ° C.
- a pressure sensitive adhesive based on a polymer is preferable.
- the heat-expandable microsphere may be, for example, a microsphere in which a material that is easily gasified and expanded by heating, such as isobutane, propane, or pentane, is encapsulated in an elastic shell.
- the shell is often formed of a hot-melt material or a material that is destroyed by thermal expansion.
- the substance forming the shell include vinylidene chloride-acrylonitrile copolymer, polyvinyl alcohol, polyvinyl butyral, polymethyl methacrylate, polyacrylonitrile, polyvinylidene chloride, and polysulfone.
- Thermally expandable microspheres can be produced by a conventional method such as a coacervation method or an interfacial polymerization method.
- commercially available products such as “Matsumoto Microsphere F30D, F50D” manufactured by Matsumoto Yushi Seiyaku Co., Ltd. can be used as “Matsumoto Microsphere F30D, F50D” manufactured by Matsumoto Yu
- a thermally expandable microscopic material having an appropriate strength that does not rupture until the volume expansion coefficient is 5 times or more, especially 7 times or more, particularly 10 times or more.
- a sphere is preferred.
- the amount of thermally expandable microspheres can be appropriately set according to the expansion ratio of the heat-peelable pressure-sensitive adhesive layer or the decrease in adhesive strength (adhesive strength), but generally forms a heat-peelable pressure-sensitive adhesive layer.
- the amount is, for example, 1 to 150 parts by weight, preferably 5 to 100 parts by weight with respect to 100 parts by weight of the base polymer (for example, acrylic polymer in the case of an acrylic adhesive). If the amount of the heat-expandable microspheres is less than 1 part by weight, sufficient peelability may not be exhibited. On the other hand, if the amount exceeds 150 parts by weight, the surface of the heat-peelable pressure-sensitive adhesive layer May be uneven, resulting in a decrease in adhesiveness.
- the electronic paper in the present invention, it is sufficient if the electronic paper can be easily peeled to such an extent that it does not break down, and when forming a thin heat-peelable pressure-sensitive adhesive layer, it is possible to suppress the amount of thermally expansible microspheres to a certain extent. Is preferable for stably forming. From this point, the blending amount (30 to 80 parts by weight) which is about half of the blending amount necessary for complete peeling (adhesion becomes zero) is optimal.
- the thermal expansion start temperature of the heat-peelable pressure-sensitive adhesive layer of the present invention is appropriately determined according to the heat resistance of the electronic paper and is not particularly limited, but is generally 70 to 160 ° C., preferably 75. ⁇ 110 ° C.
- the thermal expansion start temperature is less than 70 ° C., for example, when the TFT is exposed to a high temperature environment when forming a TFT on a temporarily fixed electronic paper support film, the thermal exfoliation-type pressure-sensitive adhesive layer undergoes thermal expansion and has an adhesive strength. May decrease, and the adhesion reliability in a high-temperature environment may decrease.
- thermal expansion start temperature in the present invention refers to a thermal expansion apparatus (product name “TMA / SS6100” manufactured by SII / Nanotechnology Co., Ltd.) using a thermal expansion microsphere, and an expansion method (load: This is the temperature at which expansion of the thermally expandable microsphere started when measured at 19.6 N, probe: 3 mm ⁇ .
- the above-mentioned thermal expansion start temperature can be appropriately controlled depending on the type of the thermally expandable microsphere, the particle size distribution, and the like. In particular, it can be easily controlled by classifying the thermally expandable microspheres and sharpening the particle size distribution of the thermally expandable microspheres used.
- a classification method a known method can be used, and either a dry method or a wet method may be used.
- the classification device include known classification devices such as a gravity classifier, an inertia classifier, and a centrifugal classifier. Can be used.
- the heat-peelable pressure-sensitive adhesive layer is preferably located on the surface layer (outermost layer) of the double-sided pressure-sensitive adhesive tape, but may be located on an inner layer other than the surface layer. In that case, if it is a layer which has a role which gives heat peelability to the outermost layer of a sheet
- the heat-peelable pressure-sensitive adhesive layers on one side of the double-sided pressure-sensitive adhesive tape (for example, the surface to be attached to the electronic paper support film) and the other surface (for example, the surface to be attached to the support plate) are the same.
- Thermally expandable microspheres that expand and / or foam at different temperatures may be included, and thermally expandable microspheres that expand and / or foam at different temperatures.
- a coating liquid containing a pressure-sensitive adhesive and thermally expandable microspheres is prepared using a solvent as necessary, and this is applied to a base material layer or a rubbery organic elastic layer (dry coating).
- Method a method in which the coating agent is applied onto an appropriate separator (such as release paper) to form an adhesive layer, and this is transferred (transferred) onto the base material layer or rubber-like organic elastic layer (dry lamination).
- Method a resin composition containing the constituent material of the base material layer and a resin composition containing the pressure-sensitive adhesive layer forming material can be co-extruded (coextrusion method).
- the pressure-sensitive adhesive layer may be either a single layer or multiple layers.
- the thickness of the pressure-sensitive adhesive layer is, for example, about 5 to 300 ⁇ m, preferably about 10 to 100 ⁇ m. In the case of a heat-peelable pressure-sensitive adhesive layer containing thermally expandable microspheres, it may be thicker than the maximum particle size of the thermally expandable microspheres contained. If the thickness is excessive, cohesive failure may occur at the time of peeling after the heat treatment, adhesive residue may be generated on the electronic paper, and the peelability may be lowered. On the other hand, if the thickness is too small, the adhesive strength is insufficient, and it may be difficult to hold the adherend during temporary fixing.
- the unevenness of the thermally expandable microspheres impairs the surface smoothness and lowers the adhesiveness, so that there is a risk of falling off during temporary fixing.
- the degree of deformation of the heat-peelable pressure-sensitive adhesive layer due to heat treatment is small, the adhesive force is difficult to smoothly decline, and in addition, in order to maintain the adhesiveness during temporary fixation, It may be necessary to make the particle size too small.
- the adhesive force between the support plate and the adhesive layer of the double-sided adhesive tape and the adhesive force between the support film and the adhesive layer are both preferably about 0.5 to 7.0 N / 20 mm, more preferably 0.5 to 5.0 N / 20 mm.
- a support plate and an adhesive layer and a support film and an adhesive layer may peel off.
- the pressure-sensitive adhesive force is too high, the pressure-sensitive adhesive force does not decrease when the pressure-sensitive adhesive layer is foamed and peeled off from the support film and the support plate, and the adhesion between the support plate and the pressure-sensitive adhesive layer, and the support film and the pressure-sensitive adhesive layer. Since the adhesiveness with the agent layer remains, the formed TFT may be damaged.
- the said adhesive force is measured based on JISZ0237.
- the gel fraction (ratio of solvent insoluble matter) of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape is preferably 50% (% by weight) or more, more preferably 70% (% by weight) or more.
- the said gel fraction is a ratio of what does not melt
- the substrate constituting the substrate layer is not particularly limited, and various substrates can be used.
- fiber-based substrates such as cloth, nonwoven fabric, felt, and net
- paper-based materials such as various papers Base materials
- Metal base materials such as metal foils and metal plates
- Plastic base materials such as films and sheets made of various resins
- Rubber base materials such as rubber sheets
- Foams such as foam sheets and laminates thereof Any suitable thin leaf body can be used.
- the material or material of the plastic base material examples include polyester (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, etc.), polyolefin (polyethylene, polypropylene, ethylene-propylene copolymer, etc.), polyvinyl, and the like. Alcohol, polyvinylidene chloride, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyamide, polyimide, cellulose, fluororesin, polyether, polystyrene resin (polystyrene, etc.), polycarbonate, polyethersulfone Etc.
- the base material layer may have a single layer form or may have a multiple layer form.
- the thickness of the base material layer is not particularly limited, but is preferably 500 ⁇ m or less, more preferably about 5 to 250 ⁇ m.
- the surface of the base material layer is subjected to a conventional surface treatment, for example, chromic acid treatment, ozone exposure, flame exposure, high-voltage impact exposure, ionizing radiation, in order to enhance the adhesion with the pressure-sensitive adhesive layer, etc., if necessary.
- a conventional surface treatment for example, chromic acid treatment, ozone exposure, flame exposure, high-voltage impact exposure, ionizing radiation, in order to enhance the adhesion with the pressure-sensitive adhesive layer, etc., if necessary.
- An oxidation treatment or the like by a chemical or physical method such as treatment may be performed.
- the double-sided pressure-sensitive adhesive tape of the present invention preferably has a rubbery organic elastic layer between the base material layer and the pressure-sensitive adhesive layer.
- the rubbery organic elastic layer has a function of increasing the adhesion area by causing the surface of the double-sided pressure-sensitive adhesive tape to follow the surface shape of the electronic paper support film well when bonding the double-sided pressure-sensitive adhesive tape to the electronic paper support film.
- the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape is a heat-peelable pressure-sensitive adhesive layer
- the heat-peelable pressure-sensitive adhesive layer undergoes a three-dimensional structural change when the double-sided pressure-sensitive adhesive tape is thermally peeled from the electronic paper and the support plate. It has a function of promoting the formation of a swell structure.
- the rubber-like organic elastic layer is provided with the above-described functions.
- natural rubber, synthetic rubber, or synthetic resin having rubber elasticity having a D-type Sure D-type hardness of 50 or less, particularly 40 or less based on ASTM D-2240. It is preferable to form.
- the synthetic rubber or synthetic resin having rubber elasticity examples include, for example, synthetic rubbers such as nitriles, dienes, and acrylics; thermoplastic elastomers such as polyolefins and polyesters; ethylene-vinyl acetate copolymers, polyurethanes, and polybutadienes. And a synthetic resin having rubber elasticity such as soft polyvinyl chloride.
- essentially a hard polymer such as polyvinyl chloride can exhibit rubber elasticity when combined with a compounding agent such as a plasticizer or a softening agent. It can be used as a constituent material of the organic elastic layer.
- the adhesive which comprises the above-mentioned adhesive layer can also be used preferably as a constituent material of a rubber-like organic elastic layer.
- the thickness of the rubbery organic elastic layer is generally about 5 to 300 ⁇ m, preferably about 5 to 100 ⁇ m. If the thickness is excessive, the pressure-sensitive adhesive layer is prevented from changing three-dimensionally in the peeling step, and the peelability tends to be lowered.
- the rubber-like organic elastic layer is formed by, for example, applying a coating liquid containing a rubber-like organic elastic layer forming material such as natural rubber, synthetic rubber, or synthetic resin having rubber elasticity onto the base material layer (coating method).
- a coating liquid containing a rubber-like organic elastic layer forming material such as natural rubber, synthetic rubber, or synthetic resin having rubber elasticity onto the base material layer
- a method of adhering a film made of the rubber-like organic elastic layer forming material or a laminated film in which a layer made of the rubber-like organic elastic layer forming material is previously formed on one or more pressure-sensitive adhesive layers to a base material layer dry Laminating method
- a method of co-extruding a resin composition containing the constituent material of the base material layer and a resin composition containing the rubber-like organic elastic layer forming material co-extrusion method.
- the rubbery organic elastic layer forming material includes, for example, a filler, a flame retardant, an anti-aging agent, an antistatic agent, a softening agent, an ultraviolet absorber, an antioxidant, a plasticizer, and a surface active agent.
- a filler for example, a flame retardant, an anti-aging agent, an antistatic agent, a softening agent, an ultraviolet absorber, an antioxidant, a plasticizer, and a surface active agent.
- a flame retardant for example, a flame retardant, an anti-aging agent, an antistatic agent, a softening agent, an ultraviolet absorber, an antioxidant, a plasticizer, and a surface active agent.
- the addition amount is preferably 0.01 to 10 parts by weight, more preferably 0 to 100 parts by weight of the rubbery organic elastic layer forming material. 0.01 to 8 parts by weight.
- a crosslinking agent well-known usual crosslinking agents, such as an isocyanate type crosslinking agent, an epoxy-type crosslinking agent, a melamine type crosslinking agent, a thiuram type crosslinking agent, a resin type crosslinking agent, a metal chelate, can be used.
- the double-sided pressure-sensitive adhesive tape of the present invention may be provided with a separator (release liner) on the surface of the pressure-sensitive adhesive layer from the viewpoint of protecting the pressure-sensitive adhesive layer surface and preventing blocking.
- the separator is peeled off when the double-sided pressure-sensitive adhesive tape is attached to the adherend, and is not necessarily provided.
- the separator to be used is not particularly limited, and a known and commonly used release paper or the like can be used.
- a substrate having a release layer such as a plastic film or paper surface-treated with a release agent such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide; polytetrafluoroethylene, polychlorotrifluoroethylene, polyfluoride Low-adhesive substrate made of a fluoropolymer such as vinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene / hexafluoropropylene copolymer, chlorofluoroethylene / vinylidene fluoride copolymer; olefin resin (eg, polyethylene, polypropylene) Etc.) and the like can be used.
- a release layer such as a plastic film or paper surface-treated with a release agent such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide
- a release agent such as silicone, long-chain alkyl, fluorine, or mo
- the separator may be provided on both surfaces of the double-sided pressure-sensitive adhesive tape of the present invention, or a separator having a back release layer is provided on one adhesive surface, and the sheet is wound on the opposite adhesive surface. You may make it the back surface peeling layer of a separator contact.
- the double-sided pressure-sensitive adhesive tape of the present invention When used as a double-sided pressure-sensitive adhesive tape for an electronic paper forming process, it can be firmly attached and temporarily fixed to an electronic paper support film during the electronic paper forming process, and after the electronic paper forming process. It can be peeled off easily and without any adhesive residue.
- a heat-peelable double-sided pressure-sensitive adhesive tape containing thermally expandable microspheres is used as a double-sided pressure-sensitive adhesive tape, it has excellent adhesive force before heat treatment and firmly fixes the electronic paper support film.
- the electronic paper can be formed smoothly.
- a double-sided pressure-sensitive adhesive tape is no longer needed, by applying heat treatment, the thermally expandable microspheres contained therein expand and / or foam, and the pressure-sensitive adhesive layer has a undulating structure due to a three-dimensional structural change. Since it forms, the adhesion area with electronic paper falls rapidly, and the adhesive force with respect to electronic paper can be reduced remarkably. Accordingly, the electronic paper can be easily peeled off without being contaminated with adhesive residue.
- the method for producing an electronic paper according to the present invention includes a step of forming a TFT on the electronic paper support film by temporarily fixing the electronic paper support film to a support plate with a double-sided adhesive tape to obtain a driver layer.
- the driver layer is obtained by first temporarily fixing an electronic paper support film to a support plate via a double-sided adhesive tape, and forming a TFT on the temporarily fixed electronic paper support film.
- the material constituting the support plate is not particularly limited as long as it can hold the electronic paper support film to be bonded, but is preferably a hard material than the electronic paper support film, for example, silicon, glass, A SUS board, a copper board, an acrylic board, etc. are mentioned.
- the thickness of the support plate is preferably, for example, 0.4 mm or more (for example, 0.4 to 5.0 mm).
- the support plate and the electronic paper support film can be adhered to each other, for example, using a roller, a spatula, or a press machine. Can be matched.
- the material constituting the electronic paper support film is not particularly limited as long as it is a material that can exhibit flexibility even after being bonded to the display layer.
- polyethylene terephthalate (PET) polyethylene naphthalate A film made of polyester such as (PEN) can be used.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- the electronic paper support film may be a transparent film or an opaque film. Further, it may be a color printing film, a color kneaded film, or a vapor deposition film vapor-deposited with gold, silver or aluminum as necessary.
- the thickness of the electronic paper support film is, for example, about 400 ⁇ m or less, preferably about 25 to 350 ⁇ m, particularly preferably about 38 to 300 ⁇ m.
- the type of TFT formed on the electronic paper support film is not particularly limited. For example, a staggered type, an inverted staggered type, a coplanar type, an inverted type is used. Coplanar (inverted coplanar) molds can be formed.
- the semiconductor layer, gate insulating film, electrode, protective insulating film, etc. that constitute the transistor are formed into a thin film on the electronic paper support film by a method such as vacuum deposition, sputtering, plasma CVD, or photoresist as in the case of normal TFT formation. Can be formed.
- the display layer is a layer having an image display function.
- the image display format of the display layer is not particularly limited as long as it has a display function using electricity and magnetism.
- a twist ball method, an electrophoresis method, a charged toner display method, or the like can be used. .
- the display layer and the electronic paper support film on which the TFT is formed can be in close contact.
- a roller, a spatula, a press Can be pasted together using a machine.
- the adhesive layer is provided on the back surface of the display layer in order to adhere to the electronic paper support film on which the TFT is formed, it is not particularly necessary, but the adhesive layer is not provided on the back surface of the display layer.
- a general adhesive can be used to bond the electronic paper support film on which the TFT is formed.
- the electronic paper peeling step it is preferable to reduce the adhesive strength of the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive tape and peel the electronic paper obtained through the electronic paper forming step from the support plate.
- the adhesive force can be reduced by irradiating active energy rays (for example, ultraviolet rays).
- active energy rays for example, ultraviolet rays.
- Irradiation conditions such as irradiation intensity and irradiation time of active energy ray irradiation are not particularly limited, and can be set as necessary.
- the adhesive strength can be reduced by heating.
- the heating means it is only necessary to heat the double-sided adhesive tape to rapidly expand and / or foam the thermally expandable microspheres contained therein.
- an electric heater; dielectric heating; magnetic heating; near infrared, mid infrared Heating by electromagnetic waves such as far infrared rays; ovens, hot plates, etc. can be used without particular limitation.
- the heating temperature may be any temperature at which the thermally expandable microspheres contained in the double-sided pressure-sensitive adhesive tape expand and / or foam, and is, for example, about 70 to 200 ° C., preferably about 100 to 160 ° C.
- Example 1 Contains 100 parts by weight of a copolymer-based pressure-sensitive adhesive (containing 1 part by weight of an isocyanate-based crosslinking agent) of 2-ethylhexyl acrylate / ethyl acrylate / methyl methacrylate (30 parts by weight / 70 parts by weight / 5 parts by weight)
- the toluene solution was applied to both sides of a polyester film (thickness: 100 ⁇ m) as a substrate so that the thickness after drying was 20 ⁇ m and dried to obtain rubber-like organic elastic layers A and B.
- a glass plate (thickness: 2.0 mm, size: 10 cm ⁇ 10 cm) and a PEN film (thickness: 50 ⁇ m) were bonded together without bubbles through the obtained double-sided adhesive tape 1.
- TFT was formed on the PEN film by the following procedure. 1.
- a gate electrode N + Si, 20 ⁇ m, 1 mm pitch
- a nitride film (thickness: 5 ⁇ m) was formed on the gate electrode.
- a channel layer (hydrogenated amorphous Si, thickness: 20 ⁇ m) was formed on the nitride film. 4).
- Aluminum electrodes were formed by vapor deposition, and a conductive organic material (5-membered cyclic hydrocarbon pentacene polymer material) was formed between the electrodes by printing.
- a PET film (thickness: 250 ⁇ m) as a substitute for the display layer is placed on the PEN film on which the TFT is formed via a pressure-sensitive double-sided adhesive tape (manufactured by Nitto Denko Corporation, trade name “No. 5000N”).
- Sample 1 was prepared by pasting.
- Example 2 Instead of using the double-sided adhesive tape 1 when bonding a glass plate (thickness: 2.0 mm, size: 10 cm ⁇ 10 cm) and a PEN film (thickness: 50 ⁇ m), a pressure-sensitive double-sided adhesive tape (Nitto) Sample 2 was produced in the same manner as Example 1 except that Denko Corporation, trade name “No. 5000N”) was used.
- Example 3 In the same manner as in Example 1, a rubbery organic elastic layer was provided on one side of a polyester film having a thickness of 100 ⁇ m and bonded to an adhesive layer containing thermally expandable microspheres on a separator. Next, on the other side of the polyester film, 2-ethylhexyl acrylate / ethyl acrylate / methyl methacrylate (30 parts by weight / 70 parts by weight / 5 parts by weight) copolymer-based pressure-sensitive adhesive (isocyanate-based crosslinking agent) A toluene solution containing 3 parts by weight) was applied so that the thickness after drying was 10 ⁇ m.
- 2-ethylhexyl acrylate / ethyl acrylate / methyl methacrylate (30 parts by weight / 70 parts by weight / 5 parts by weight) copolymer-based pressure-sensitive adhesive (isocyanate-based crosslinking agent)
- a toluene solution containing 3 parts by weight was applied
- a double-sided pressure-sensitive adhesive tape 3 provided with a heat-peelable pressure-sensitive adhesive layer on one side was obtained.
- the same operation as in Example 1 was performed except that the double-sided pressure-sensitive adhesive tape 3 was used as a double-sided pressure-sensitive adhesive tape for bonding the glass plate and the PEN film, and a sample 3 was prepared (on the pressure-sensitive adhesive layer side). A PEN film was bonded to the heat-peelable pressure-sensitive adhesive layer side of the glass plate).
- Comparative Example 1 Instead of using the double-sided adhesive tape 1 when laminating a glass plate (thickness: 2.0 mm, size: 10 cm ⁇ 10 cm) and a PEN film (thickness: 50 ⁇ m), wax (Kuju Electric Co., Ltd.) Sample 4 was produced in the same manner as in Example 1 except that the product name “SLOT WAX”) was used.
- Adhesive strength measurement The pressure-sensitive adhesive tape obtained in Example 1, the pressure-sensitive double-sided pressure-sensitive adhesive tape used in Example 2 (manufactured by Nitto Denko Corporation, trade name “No. 5000N”), and the pressure-sensitive adhesive obtained in Example 3 From the tape, a sample for measuring adhesive strength of 130 mm (longitudinal direction) ⁇ 20 mm (width direction) was produced. Next, the adhesive surface of the sample was bonded to the test plate by reciprocating a 2 kg rubber roller (width: about 40 mm), and then left in an atmosphere of 23 ° C. and 50% RH for 30 minutes. Was used to perform a 180 ° peel test in accordance with JIS Z 0237 and measure the adhesive strength.
- Gel fraction measurement Adhesive by applying and drying on a silicone-treated surface of a PET separator (thickness: 38 ⁇ m) so that the toluene solution containing the pressure-sensitive adhesive prepared in Example 1 has a thickness of 30 ⁇ m after drying. A layer was formed. Next, the toluene solution containing the pressure-sensitive adhesive prepared in Example 1 and the heat-expandable microspheres was applied on the silicone-treated surface of the PET separator (thickness: 38 ⁇ m) so that the thickness after drying was 20 ⁇ m. A rubbery organic elastic layer was formed by drying.
- the sample was cut into a size of 130 mm (longitudinal direction) ⁇ 20 mm (width direction) to prepare a gel fraction measurement sample.
- a Teflon (registered trademark) sheet (trade name “Nitoflon”, manufactured by Nitto Denko Corporation) . Bind with a kite string, measure the weight at that time, and use this weight as the weight before immersion.
- the weight before immersion is the total weight of the pressure-sensitive adhesive (collected above), the Teflon (registered trademark) sheet, and the kite string.
- the total weight of the Teflon (registered trademark) sheet and the kite string is also measured, and this weight is defined as the packaging weight.
- the above-mentioned pressure-sensitive adhesive wrapped with a Teflon (registered trademark) sheet and tied with a kite string (referred to as “sample”) is placed in a 50 ml container filled with toluene, and allowed to stand at 25 ° C. for 7 days. Thereafter, the sample (after toluene treatment) is taken out from the container, transferred to an aluminum cup, dried in a dryer at 130 ° C.
- Example 2 is not measured.
- Example 3 the gel fraction was measured according to the measuring method in the case of Example 1 about both a heat-peeling type adhesive layer and a pressure sensitive adhesive layer.
- the gel fraction was measured in the same manner as in Example 1 except that 5 g of wax was used instead of the adhesive.
- a TFT thin film transistor
- Base layer 2A, 2B Rubbery organic elastic layer 3A, 3B: Adhesive layer 4: Separator 5: Double-sided adhesive tape 6: Support plate 7: Electronic paper support film 8: Thin film transistor (TFT) 9: Display layer (front panel) 10: Electronic paper
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
Description
1.両面粘着テープ5の一方の面を支持板6に貼り合わせる。
2.両面粘着テープ5の、支持板6を貼り合わせた面とは反対の面に電子ペーパー支持フィルム7を貼り合わせる。
3.貼り合わされた電子ペーパー支持フィルム7上に、TFT8を形成する。
4.TFT8が形成された電子ペーパー支持フィルム7上に、表示層(フロントパネル)9を貼り合わせる。
5.加熱処理を施して、両面粘着テープ5の粘着剤層3A、3Bを膨張及び/又は発泡させて、得られた電子ペーパー10と支持板6とを剥離する。
本発明の両面粘着テープは電子ペーパー及び支持板から剥離可能なものであればよい。また、本発明の両面粘着テープは、ハンドリング性、加工性等の観点から、基材層付きの両面粘着テープであることが好ましい。更に、本発明の両面粘着テープは、上記の粘着剤層、基材層の他に、ゴム状有機弾性層を有していることが好ましい。また、本発明の両面粘着テープの粘着面は使用までの間、セパレータ(剥離ライナー)が貼着され、保護されていてもよい。
本発明の両面粘着テープは粘着テープ両面に粘着剤層を有する。該粘着剤層としては、例えば、熱膨張性微小球を含有しない感圧接着剤層、活性エネルギー線硬化型粘着剤層、熱剥離型粘着剤層等を挙げることができる。
基材層を構成する基材としては、特に限定されず、各種基材を用いることが可能であり、例えば、布、不織布、フェルト、ネットなどの繊維系基材;各種の紙などの紙系基材;金属箔、金属板などの金属系基材;各種樹脂によるフィルムやシートなどのプラスチック系基材;ゴムシートなどのゴム系基材;発泡シートなどの発泡体や、これらの積層体等の適宜な薄葉体を用いることができる。上記プラスチック系基材の材質又は素材としては、例えば、ポリエステル(ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート、ポリブチレンナフタレートなど)、ポリオレフィン(ポリエチレン、ポリプロピレン、エチレン-プロピレン共重合体など)、ポリビニルアルコール、ポリ塩化ビニリデン、ポリ塩化ビニル、塩化ビニル-酢酸ビニル共重合体、ポリ酢酸ビニル、ポリアミド、ポリイミド、セルロース類、フッ素系樹脂、ポリエーテル、ポリスチレン系樹脂(ポリスチレンなど)、ポリカーボネート、ポリエーテルスルホンなどが挙げられる。なお、基材層は単層の形態を有していてもよく、また、複層の形態を有していてもよい。
本発明の両面粘着テープには、基材層と粘着剤層との間に、ゴム状有機弾性層を有することが好ましい。ゴム状有機弾性層は、両面粘着テープを電子ペーパー支持フィルムに接着する際に、両面粘着テープの表面を電子ペーパー支持フィルムの表面形状に良好に追従させて、接着面積を大きくするという機能を有する。また、両面粘着テープの粘着剤層が熱剥離型粘着剤層である場合、該両面粘着テープを電子ペーパー及び支持板から加熱剥離する際に、熱剥離型粘着剤層が三次元的構造変化することによるうねり構造の形成を助長する機能を有する。
本発明の両面粘着テープには、粘着剤層表面の保護、ブロッキング防止の観点などから、粘着剤層表面にセパレータ(剥離ライナー)が設けられていてもよい。セパレータは両面粘着テープを被着体に貼着する際に剥がされるものであり、必ずしも設けなくてもよい。用いられるセパレータとしては、特に限定されず、公知慣用の剥離紙などを使用できる。例えば、シリコーン系、長鎖アルキル系、フッ素系、硫化モリブデン系等の剥離剤により表面処理されたプラスチックフィルムや紙等の剥離層を有する基材;ポリテトラフルオロエチレン、ポリクロロトリフルオロエチレン、ポリフッ化ビニル、ポリフッ化ビニリデン、テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体、クロロフルオロエチレン・フッ化ビニリデン共重合体等のフッ素系ポリマーからなる低接着性基材;オレフィン系樹脂(例えば、ポリエチレン、ポリプロピレンなど)等の無極性ポリマーからなる低接着性基材などを用いることができる。
本発明に係る電子ペーパーの製造方法は、電子ペーパー支持フィルムを両面粘着テープで支持板に仮固定した状態で、該電子ペーパー支持フィルム上にTFTを形成してドライバ層を得、さらに、該ドライバ層上に画像表示機能を有する表示層を貼り合わせる電子ペーパー形成工程を有する。
ドライバ層は、まず、電子ペーパー支持フィルムを支持板に両面粘着テープを介して仮固定し、仮固定された電子ペーパー支持フィルム上にTFTを形成することにより得られる。前記支持板を構成する材料としては、貼り合わされる電子ペーパー支持フィルムを保持することができればよく、特に限定されないが、電子ペーパー支持フィルムより硬質材料のものが好ましく用いられ、例えば、シリコン、ガラス、SUS板、銅板、アクリル板などが挙げられる。支持板の厚さとしては、例えば0.4mm以上(例えば、0.4~5.0mm)が好ましい。
本発明に係る電子ペーパーの製造方法においては、電子ペーパー形成工程後に、さらに、電子ペーパーを支持板から剥離する工程を設けることが好ましい。剥離された電子ペーパーは、周知慣用の方法で回収される。
アクリル酸-2-エチルヘキシル/アクリル酸エチル/メタクリル酸メチル(30重量部/70重量部/5重量部)共重合体系感圧接着剤100重量部(イソシアネート系架橋剤を1重量部配合)を含むトルエン溶液を乾燥後の厚さが20μmとなるように基材としてのポリエステルフィルム(厚さ:100μm)の両面に塗布、乾燥し、ゴム状有機弾性層A、Bを得た。
次に、アクリル酸-2-エチルヘキシル/アクリル酸エチル/メタクリル酸メチル(30重量部/70重量部/5重量部)共重合体系感圧接着剤100重量部(イソシアネート系架橋剤を2重量部配合)に、熱膨張性微小球(松本油脂製薬(株)製、商品名「マツモトマイクロスフェアー F30D」、発泡開始温度:約80℃)30重量部を含むトルエン溶液を乾燥後の厚さが30μmとなるようにセパレータ上に塗布、乾燥し、粘着剤層A、Bを得、得られた粘着剤層A、Bを上記ゴム状有機弾性層A、B上にそれぞれ貼り合わせて、両面粘着テープ1を得た。
1.PENフィルム上にフォトリソグラフィー方式を使用してゲート電極(N+Si、20μm、1mmピッチ)を形成した。
2.ゲート電極上に窒化膜(厚さ:5μm)を形成した。
3.窒化膜上にチャネル層(水素化アモルファスSi、厚さ:20μm)を形成した。
4.蒸着方式によりアルミニウム電極を形成し、電極間に導体有機材料(5員環式炭化水素のペンタセン系高分子材料)を印刷方式で形成した。
ガラス板(厚さ:2.0mm、サイズ:10cm×10cm)と、PENフィルム(厚さ:50μm)とを貼り合わせる際に、両面粘着テープ1を使用する代わりに、感圧型両面粘着テープ(日東電工(株)製、商品名「No.5000N」)を使用した以外は実施例1と同様にして、サンプル2を作製した。
実施例1と同様の操作で、厚さ100μmのポリエステルフィルムの片面にゴム状有機弾性層を設け、セパレータ上の熱膨張性微小球を含む粘着剤層と貼り合わせた。次に、ポリエステルフィルムのもう一方の面に、アクリル酸2-エチルヘキシル/アクリル酸エチル/メタクリル酸メチル(30重量部/70重量部/5重量部)共重合体系感圧接着剤(イソシアネート系架橋剤3重量部配合)を含むトルエン溶液を乾燥後の厚さが10μmとなるように塗布した。このようにして、片面に熱剥離型粘着剤層が設けられた両面粘着テープ3を得た。次に、ガラス板とPENフィルムを貼り合わせる両面粘着テープとして、上記両面粘着テープ3を使用すること以外は実施例1と同様の操作を行い、サンプル3を作製した(感圧型粘着剤層側にガラス板を、熱剥離型粘着剤層側にPENフィルムを貼り合わせた)。
ガラス板(厚さ:2.0mm、サイズ:10cm×10cm)と、PENフィルム(厚さ:50μm)とを貼り合わせる際に、両面粘着テープ1を使用する代わりに、ワックス(九重電気(株)製、商品名「SLOT WAX」)を使用した以外は実施例1と同様にして、サンプル4を作製した。
実施例及び比較例で得られた、疑似電子ペーパーがガラス板に貼り合わされたサンプル1~4において、疑似電子ペーパーをガラス板から剥離するのに要する時間(秒)、剥離後、疑似電子ペーパー背面を洗浄する必要がある場合は、その洗浄に要する時間(秒)、及び洗浄に使用した溶剤(トルエン)の量(g)を測定した。なお、剥離する際には、100℃に設定したホットプレートを使用して加熱処理を施した。
実施例1で得られた粘着テープ、実施例2で用いた感圧型両面粘着テープ(日東電工(株)製、商品名「No.5000N」)、及び実施例3で得られた粘着テープから、130mm(長手方向)×20mm(幅方向)の粘着力測定用サンプルを作製した。次いで、サンプルの粘着面を、試験板に2kgのゴムローラー(幅:約40mm)を一往復させることにより貼り合わせた後、23℃、50%RHの雰囲気中で30分放置し、引張試験機を用いて、JIS Z 0237に準拠して180°剥離試験を行い、粘着力を測定した。なお、粘着力の測定は以下の条件で行った。
装置 :SHIMAZU社製、商品名「オートグラフ」
サンプル幅 :20mm
引張速度 :300mm/分
剥離角度 :180°
温湿度環境 :23℃、50%RH
繰り返し数 :n=3回
試験板として、ステンレス板(SUS304)を用いた。
なお、比較例1においては、粘着力は測定できない。
実施例1で調製した感圧接着剤を含むトルエン溶液を乾燥後の厚みが30μmとなるようにPETセパレータ(厚さ:38μm)のシリコーン処理表面上に塗布・乾燥させて粘着剤層を形成した。
次に、実施例1で調製した感圧接着剤と熱膨張性微小球を含むトルエン溶液を乾燥後の厚みが20μmとなるようにPETセパレータ(厚さ:38μm)のシリコーン処理表面上に塗布・乾燥させてゴム状有機弾性層を形成した。
上記粘着剤層とゴム状有機弾性層を貼り合わせた後、130mm(長手方向)×20mm(幅方向)のサイズに切断して、ゲル分率測定用サンプルを作製した。
上記サンプルの粘着剤層側のPETセパレータを剥離し、粘着剤層から、粘着剤を5g採取し、テフロン(登録商標)シート(商品名「ニトフロン」、日東電工(株)製)に包んだ後、凧糸で縛り、その際の重量を測定し、該重量を浸漬前重量とする。なお、該浸漬前重量は、粘着剤(上記で採取したもの)と、テフロン(登録商標)シートと、凧糸との総重量である。また、テフロン(登録商標)シートと凧糸との合計重量も測定しておき、該重量を包袋重量とする。
次に、上記の粘着剤をテフロン(登録商標)シートで包み凧糸で縛ったもの(「試料」と称する)を、トルエンで満たした50ml容器に入れ、25℃にて7日間静置する。その後、容器から試料(トルエン処理後)を取り出して、アルミニウム製カップに移し、130℃で2時間、乾燥機中で乾燥してトルエンを除去した後、重量を測定し、該重量を浸漬後重量とする。
そして、下記の式からゲル分率を算出する。
ゲル分率(重量%)=(a-b)/(c-b)×100 (1)
(式(1)において、aは浸漬後重量であり、bは包袋重量であり、cは浸漬前重量である。)
実施例2については未測定である。実施例3については、熱剥離型粘着剤層、感圧型粘着剤層の両方について、実施例1の場合の測定法に準じてゲル分率を測定した。
比較例1においては、粘着剤に換えてワックスを5g用いた以外は、実施例1と同様にしてゲル分率を測定した。
ワックスを使用して仮固定した場合(比較例1)は、剥離後に電子ペーパーの背面に付着したワックスを洗浄することが必要であった。洗浄には長時間を要し、且つ洗浄用溶剤を多量に使用した。
2A、2B:ゴム状有機弾性層
3A、3B:粘着剤層
4:セパレータ
5:両面粘着テープ
6:支持板
7:電子ペーパー支持フィルム
8:薄膜トランジスタ(TFT)
9:表示層(フロントパネル)
10:電子ペーパー
Claims (5)
- 電子ペーパー支持フィルムを両面粘着テープで支持板に仮固定した状態で、該電子ペーパー支持フィルム上に薄膜トランジスタを形成してドライバ層を得、さらに、該ドライバ層上に画像表示機能を有する表示層を貼り合わせる電子ペーパー形成工程を有する電子ペーパーの製造方法。
- 電子ペーパー形成工程後に、電子ペーパーを支持板から剥離する工程を有する請求項1に記載の電子ペーパーの製造方法。
- 両面粘着テープの少なくとも片面が熱剥離型粘着剤層面である請求項1又は2に記載の電子ペーパーの製造方法。
- 熱剥離型両面粘着テープが、基材層の両面に熱膨張性微小球を含有する熱剥離型粘着剤層を有することを特徴とする請求項1~3の何れかの項に記載の電子ペーパーの製造方法。
- 請求項1~4の何れかの項に記載の電子ペーパーの製造方法に使用する電子ペーパー形成工程用両面粘着テープ。
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US20130335879A1 (en) * | 2011-01-19 | 2013-12-19 | Nitto Denko Corporation | Double-sided adhesive tape or sheet, and adherend processing method |
WO2013146707A1 (ja) * | 2012-03-27 | 2013-10-03 | 日東電工株式会社 | 電子部品切断用加熱剥離型粘着シート及び電子部品加工方法 |
JP2013203800A (ja) * | 2012-03-27 | 2013-10-07 | Nitto Denko Corp | 電子部品切断用加熱剥離型粘着シート及び電子部品加工方法 |
JP2018093598A (ja) * | 2016-12-01 | 2018-06-14 | トヨタ自動車株式会社 | コイルの絶縁材 |
CN108630116A (zh) * | 2018-06-01 | 2018-10-09 | 深圳市深科达智能装备股份有限公司 | 全自动电子纸贴合机 |
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Also Published As
Publication number | Publication date |
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TW201013605A (en) | 2010-04-01 |
CN102077135A (zh) | 2011-05-25 |
JP2010039472A (ja) | 2010-02-18 |
US20110094675A1 (en) | 2011-04-28 |
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