WO2011055689A1 - 剥離シート付両面粘着剤シート - Google Patents
剥離シート付両面粘着剤シート Download PDFInfo
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- WO2011055689A1 WO2011055689A1 PCT/JP2010/069273 JP2010069273W WO2011055689A1 WO 2011055689 A1 WO2011055689 A1 WO 2011055689A1 JP 2010069273 W JP2010069273 W JP 2010069273W WO 2011055689 A1 WO2011055689 A1 WO 2011055689A1
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- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- sheet
- pressure
- release sheet
- release
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
- C09J7/403—Adhesives in the form of films or foils characterised by release liners characterised by the structure of the release feature
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1476—Release layer
Definitions
- the present invention relates to a double-sided pressure-sensitive adhesive sheet to which two members (adhered bodies) can be attached, and relates to a double-sided pressure-sensitive adhesive sheet with a release sheet formed by laminating release sheets on both upper and lower sides of an adhesive layer. .
- Double-sided with release sheet formed by forming a pressure-sensitive adhesive into a sheet and laminating release sheets on both the upper and lower sides of the pressure-sensitive adhesive layer for bonding various optical members used in display devices such as liquid crystal panels, PDPs, and EL displays
- Many adhesive sheets are used.
- this type of double-sided pressure-sensitive adhesive sheet with a release sheet is used to sequentially laminate an antireflection film, a toning film and an electromagnetic wave shielding film on a glass plate.
- a space layer between a polarizing plate and an upper member thereof is filled with an adhesive sheet.
- a double-sided pressure-sensitive adhesive sheet with a release sheet is used.
- a double-sided pressure-sensitive adhesive sheet with a release sheet is frequently used for bonding and fixing members.
- materials made of plastic such as various optical members, adhesives, and release sheets have high electrical insulation, so static electricity is generated when the members are rubbed together or when the release sheet is peeled off from the adhesive sheet. It can be charged and cause various problems. For example, if surrounding dust or dust adheres to the adhesive surface of the adhesive sheet due to static electricity, defects will occur at the adhesive interface with the adherend, and the adhesive force will decrease over time, or in a static state When a voltage is applied to the liquid crystal, problems such as loss of alignment of the liquid crystal molecules and loss of the liquid crystal panel may occur.
- Patent Document 1 discloses that an antistatic performance is imparted to the pressure-sensitive adhesive sheet by blending an ionic liquid in the pressure-sensitive adhesive composition.
- Patent Document 2 discloses an antistatic composition comprising an acrylic copolymer (A) having a hydroxyl group and an alkylene oxide chain in the side chain, an ionic compound (B), a curing agent (C), and an antioxidant (D).
- An adhesive is disclosed.
- Patent Document 3 discloses an antistatic photosensitive laminate having an antistatic cover film, a polyvinyl alcohol-based anti-adhesion layer, a photosensitive resin layer, and a support film.
- Patent Document 4 discloses an adhesive composition
- an ionic liquid in which an anionic component is a sulfonate anion or a sulfate ester anion, and a polymer having a glass transition temperature (Tg) of 0 ° C. or less as a base polymer.
- Tg glass transition temperature
- the pressure-sensitive adhesive layer cross-linked with this pressure-sensitive adhesive composition can prevent static charge on the object to be protected (adhered body) when peeled off, reduce contamination on the object to be protected, and achieve adhesive properties. It will be excellent.
- Patent Document 5 discloses a pressure-sensitive adhesive that contains a pressure-sensitive resin and a conductive material, and the voltage on the surface of the pressure-sensitive adhesive layer when the release film is peeled from the pressure-sensitive adhesive layer is a specific value or less.
- the conventionally proposed antistatic measures for the double-sided pressure-sensitive adhesive sheet with release sheet do not charge the pressure-sensitive adhesive sheet itself, so that the static electricity generated when the release sheet is peeled off from the pressure-sensitive adhesive sheet is not charged. It was to make.
- the release sheet for example, when a double-sided pressure-sensitive adhesive sheet with a release sheet is used as a winding body, cutting, or double-sided pressure-sensitive adhesive sheets with a release sheet are stacked together during storage or transportation In some cases, static electricity was generated and charged, which hindered various operations.
- the present invention is not only when the release sheet is peeled from the pressure-sensitive adhesive sheet, but also, for example, a double-sided pressure-sensitive adhesive sheet with a release sheet is used as a winding body, cut, or double-sided pressure-sensitive adhesive sheets with a release sheet are overlapped with each other.
- a double-sided pressure-sensitive adhesive sheet with a release sheet is used as a winding body, cut, or double-sided pressure-sensitive adhesive sheets with a release sheet are overlapped with each other.
- the present invention is a double-sided pressure-sensitive adhesive sheet with a release sheet comprising a pressure-sensitive adhesive layer and two release sheets laminated on both upper and lower sides of the pressure-sensitive adhesive layer, and one release sheet
- the double-sided pressure-sensitive adhesive sheet with a release sheet at least any one of the release sheets has conductivity, so even if static electricity is generated when the release sheet is peeled from the pressure-sensitive adhesive sheet, the adhesive Since the static electricity can be discharged through the agent layer side and discharged, the double-sided pressure-sensitive adhesive sheet with release sheet is not charged.
- the surface opposite to the pressure-sensitive adhesive layer of at least one of the release sheets, that is, the back surface has conductivity, for example, a double-sided pressure-sensitive adhesive sheet with a release sheet is used as a winding body, or cut, Even if static electricity is generated when the double-sided pressure-sensitive adhesive sheets with release sheets are overlapped with each other, static electricity can be discharged through the back surface and the static electricity can be removed, so the double-sided pressure-sensitive adhesive sheet with release sheet is not charged.
- the double-sided pressure-sensitive adhesive sheet with release sheet of the present invention not only when the release sheet is peeled from the pressure-sensitive adhesive sheet, but also the double-sided pressure-sensitive adhesive sheet with release sheet is used as a winding body, cut, or release sheet. It is possible to prevent the double-sided pressure-sensitive adhesive sheet with release sheet from being charged with static electricity even when the double-sided pressure-sensitive adhesive sheets are stacked. Therefore, the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention is used in applications that dislike static electricity in particular, such as mobile phones, PHS machines, PDA terminals, portable game machines, personal computers, automobile navigators, digital cameras, and the like. It can be suitably used for the automobile industry that requires environmental reliability.
- FIG. 1 A) to (F) are exploded cross-sectional views each showing a configuration example of a double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention.
- the surface shown as “xxx” in the drawing is a surface having conductivity. It is decomposition
- a double-sided pressure-sensitive adhesive sheet with a release sheet according to the present embodiment has a configuration in which a release sheet 1, an adhesive layer 2, and a release sheet 3 are sequentially laminated.
- a double-sided pressure-sensitive adhesive sheet with a release sheet which is at least one of the release sheet 1 and the release sheet 3 (1a, 3a) and at least one of the release sheet 1 and the release sheet 3
- the surface opposite to the one adhesive layer that is, the back surface (1b, 3b) has conductivity.
- the pressure-sensitive adhesive layer 2 itself or the pressure-sensitive adhesive surfaces (2a, 2b) of the pressure-sensitive adhesive layer 2 may or may not have conductivity.
- the pressure-sensitive adhesive sheet may include a layer other than the release sheet 1, the pressure-sensitive adhesive layer 2, and the release sheet 3.
- FIG. 1 (A) it can also comprise so that only the adhesive layer side 3a and its back surface 3b of the adhesive layer 3 may have electroconductivity, and also it shows to FIG. 1 (B).
- it can also comprise so that only the adhesive layer side 1a of the peeling sheet 1 and the surface on the opposite side to the adhesive layer of the other peeling sheet 3, ie, the back surface 3b, may have electroconductivity.
- the pressure-sensitive adhesive layer 1 is configured such that the pressure-sensitive adhesive layer side 1a and its back surface 1b and the pressure-sensitive adhesive layer 3 pressure-sensitive adhesive layer side 3a and its back surface 3b have conductivity. You can also.
- FIG. 1 (A) it can also comprise so that only the adhesive layer side 3a and its back surface 3b of the adhesive layer 3 may have electroconductivity, and also it shows to FIG. 1 (B).
- the pressure-sensitive adhesive layer 1 is configured such that the pressure-sensitive adhesive layer side 1a and its back surface 1b and the pressure-sensitive adhesive layer 3 pressure-sensitive adhesive layer side
- the surface on the opposite side to the adhesive layer of the peeling sheet 1, ie, the back surface 1b, the adhesive layer side 3a of the adhesive layer 3, and its back surface 3b have electroconductivity. It can also be configured as follows. Furthermore, as shown in FIG. 1 (E), the pressure-sensitive adhesive layer side 1a of the release sheet 1, the pressure-sensitive adhesive layer side 3a of the release sheet 3, and the back surface 3b thereof can be configured to have conductivity. Moreover, as shown to FIG. 1 (F), it can also comprise so that the back surface 1b of the peeling sheet 1 and the adhesive layer side 3a of the peeling sheet 3 may have electroconductivity.
- the peel strength between the release sheet 1 and the pressure-sensitive adhesive layer 2 is preferably different from the peel strength between the other release sheet 3 and the pressure-sensitive adhesive layer 2.
- the peel strength between the other release sheet 3 and the pressure-sensitive adhesive layer 2 is made larger than the peel strength between the release sheet 1 and the pressure-sensitive adhesive layer 2 and making the release sheet 1 easier to peel off than the release sheet 3
- a series of operations of peeling the release sheet 3 after peeling the release sheet 1 and sticking the pressure-sensitive adhesive layer 2 to the adherend can be performed efficiently. In this way, when the peel strength between the other release sheet 3 and the pressure-sensitive adhesive layer 2 is made larger than the peel strength between the release sheet 1 and the pressure-sensitive adhesive layer 2, the back surface 3b of the release sheet 3 having a higher peel strength.
- the pressure-sensitive adhesive layer side 3a of the sheet 3 is configured to have conductivity. If the release sheet 3 having a higher peel strength, that is, the pressure-sensitive adhesive layer side 3a of the release sheet 3 remaining after the two release sheets 1 and 3, is made conductive, for example, the release sheet 1 is peeled off. When the adhesive sheet is attached to the adherend, the static electricity generated when the release sheet 1 is peeled off can be released through the adhesive layer side 3a of the release sheet 3, and then the release sheet 3 is peeled off. Even if static electricity is generated at this time, it is preferable in that it can escape through the pressure-sensitive adhesive layer side 3a.
- the adhesive layer side 3a of the adhesive layer 3 of the release sheet 3 having a higher peel strength and the back surface 3b have conductivity. It is even more preferable to have such a configuration. In this way, if the back surface 3b of the release sheet 3 that remains later is conductive, for example, the release sheet 1 is peeled off, and the adhesive sheet is adhered to the adherend and then cut or stacked. Even if this occurs, static electricity can be released through the back surface 3b, so that the pressure-sensitive adhesive layer 2 is not charged.
- a conductive layer may be formed on one side or both sides of the release sheets 1 and 3.
- the peeling layer is formed on the outer side of the conductive layer on the side where the peeling layer is formed.
- the release sheet 1 and the release sheet 3 are formed by kneading a conductive material, and the release sheet 1 and the entire release sheet 3 are electrically conductive.
- the release sheet 1 and the release sheet 3 themselves can be formed to be conductive layers. Details will be described below.
- the conductive layer may be formed as a layer containing a conductive material.
- a conductive material For example, it can be formed by coating the surface of the release sheet with a conductive material and a composition containing a binder and a crosslinking agent.
- the conductive material examples include ionic conductive agents, ionic liquids, and surfactants.
- ionic conductive agents ionic liquids, and surfactants.
- Organic antistatic compounds having nonionic functional groups such as anionic conductive agents having anionic functional groups such as bases, amphoteric conductive agents such as amino acids and aminosulfate esters, polyols, polyglycerols, polyethylene glycols, etc.
- preferred examples include conductive polymers such as polyaniline, polypyrrole, and polythiophene, and inorganic conductive fillers such as tin, antimony fillers, and indium oxides.
- the pressure-sensitive adhesive layer can be formed using a currently known pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive layer is preferably formed from a transparent material. .
- the adhesive layer is more preferably a substrate-less type having no substrate.
- the baseless type is preferable because there is no layering step between the base material layer and the pressure-sensitive adhesive layer, and there is no possibility of foreign matter entering the stacking interface that may occur during stacking.
- the flexibility of the pressure-sensitive adhesive layer is not impaired, and not only the flexibility and followability to the adherend are excellent, but also transmitted light that can occur when a laminate having a different refractive index is formed. This is preferable because there is no fear of optical quality deterioration such as the isotropic property or transparency of the pressure-sensitive adhesive sheet being impaired by the interference of the substrate, the anisotropy or haze derived from the substrate.
- examples of the base polymer (main agent) of the pressure-sensitive adhesive layer include polymers such as acrylic, silicone, polyurethane, styrene, polyester, polyether, and epoxy.
- the property (form) various properties such as a liquid material, a high-viscosity material, and an elastomer material can be used.
- Such a base polymer can be appropriately selected to form an adhesive layer.
- acrylic monomers and methacrylic monomers used to synthesize (meth) acrylic acid ester polymers include 2-ethylhexyl acrylate, n-octyl acrylate, n-butyl acrylate, and ethyl acrylate.
- These main monomers include cross-linkable monomers such as hydroxyethyl acrylate, acrylic acid, itaconic acid, glycidyl acrylate, glycidyl methacrylate, methylol acrylamide, maleic anhydride, methyl methacrylate, methyl acrylate, acrylamide, acrylonitrile, methacrylonitrile, vinyl acetate.
- Highly agglomerated monomers and functional group-containing monomers such as styrene, fluorine acrylate, and silicone acrylate can be appropriately added.
- These monomers are polymerized by a known polymerization method such as solution polymerization, emulsion polymerization, bulk polymerization or suspension polymerization.
- a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator may be used depending on the polymerization method.
- crosslinking agent which comprises an adhesive layer
- an isocyanate type crosslinking agent As a crosslinking agent which comprises an adhesive layer, an isocyanate type crosslinking agent, an epoxy-type crosslinking agent, etc. can be mentioned, These can be used 1 type or 2 types or more.
- Isocyanate-based crosslinking agents include tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate and the like.
- Urethane prepolymers obtained by the addition reaction of isocyanate compounds, isocyanurates, burette-type compounds, and known polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, etc., obtained by adding these isocyanate monomers with trimethylolpropane, etc. Examples of the type of isocyanate may be mentioned.
- Epoxy crosslinking agents include ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N, N ', N'-tetraglycidyl-m-xylylenediamine, N, N, N', N'-tetraglycidylaminophenylmethane, triglycidyl isocyanurate, m-N, N-diglycidylaminophenylglycidyl ether, N, N-diglycidyl toluidine, N, N-diglycidyl aniline and the like can be mentioned.
- aziridine crosslinking agents examples include diphenylmethane-4,4′-bis (1-aziridinecarboxamide), trimethylolpropane tri- ⁇ -aziridinylpropionate, tetramethylolmethanetri- ⁇ -aziridinyl Propionate, toluene-2,4-bis (1-aziridinecarboxamide), triethylenemelamine, bisisophthaloyl-1- (2-methylaziridine), tris-1- (2-methylaziridine) phosphine, And trimethylolpropane tri- ⁇ - (2 methylaziridine) propionate.
- a crosslinking monomer may be used in place of the crosslinking agent.
- the cross-linking monomer it is preferable to use an acrylic cross-linking monomer.
- polyfunctional such as bifunctional (meth) acrylate, trifunctional (meth) acrylate, and tetrafunctional (meth) acrylate rather than monofunctional (meth) acrylate.
- a (meth) acrylate or a mixture of two or more monofunctional to tetrafunctional (meth) acrylates is preferred.
- Monofunctional (meth) acrylates include (meth) acrylic acids such as acrylic acid, methacrylic acid, and crotonic acid, lauryl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and tetrahydrofurfuryl. Examples include acrylate, 1,6-hexanediol monoacrylate, and dicyclopentanediene acrylate.
- Bifunctional (meth) acrylates include 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, diethylene glycol diacrylate, polyethylene Examples include glycol 400 diacrylate and tripropylene glycol diacrylate.
- Examples of the trifunctional (meth) acrylate include triacrylates such as pentaerythritol triacrylate, trimethylolpropane triacrylate, trimethylolpropane PO-modified triacrylate, trimethylolpropane EO-modified triacrylate, and trimethacrylates thereof. it can.
- Examples of the tetrafunctional (meth) acrylate include ditrimethylolpropane tetraacrylate and pentaerythritol tetraacrylate.
- the crosslinking monomer is not limited to the (meth) acrylate exemplified above, and for example, a (meth) acrylate monomer containing an organic functional group can also be suitably used.
- the addition amount of the crosslinking monomer is preferably in the range of 0.5 to 25 parts by mass with respect to 100 parts by mass of the base polymer.
- a photoinitiator or a thermal polymerization initiator can be used as various crosslinking initiators, and a photoinitiator is particularly preferable.
- a photoinitiator either a cleavage type photoinitiator or a hydrogen abstraction type photoinitiator can be used, and among these, a hydrogen abstraction type photoinitiator is preferable.
- a hydrogen abstraction type photoinitiator for example, a benzophenone, Michler's ketone, dibenzosuberone, 2-ethylanthraquinone, isobutylthioxanthone, or a derivative thereof, or a mixed component composed of a combination of two or more of these is used.
- the hydrogen abstraction type photoinitiator is not limited to the substances listed above. Further, the hydrogen abstraction type and the cleavage type may be used in various proportions.
- the addition amount of the photoinitiator is not particularly limited, and it is generally preferable to adjust within a range of 0.1 to 5 parts by mass with respect to 100 parts by mass of the base polymer. However, this range may be exceeded in balance with other elements.
- pigments such as pigments and dyes having near-infrared absorption characteristics, tackifiers, antioxidants, antioxidants, hygroscopic agents, ultraviolet absorbers, silane coupling agents, natural products, Various additives such as synthetic resins can be appropriately blended.
- the release sheet can be formed by providing a release layer (also referred to as “release layer”) on one surface of the release support film.
- a known resin film can be arbitrarily used as the release support film, and a film having particularly high transparency is preferable.
- a film having particularly high transparency examples thereof include a polyester film, a polycarbonate film, a triacetyl cellulose film, a polypropylene film, and a polyethylene film.
- a polyester film excellent in productivity and workability is preferable, and a biaxially stretched polyethylene terephthalate film is particularly preferable.
- the thickness of the support film is preferably 25 ⁇ m to 250 ⁇ m, more preferably 50 ⁇ m to 125 ⁇ m.
- the release layer is made of, for example, a resin such as silicone resin, fluororesin, aminoalkyd resin, polyester resin, paraffin wax, acrylic resin, urethane resin, melamine resin, urea resin, urea-melamine, cellulose, benzoguanamine, and surfactant.
- a resin such as silicone resin, fluororesin, aminoalkyd resin, polyester resin, paraffin wax, acrylic resin, urethane resin, melamine resin, urea resin, urea-melamine, cellulose, benzoguanamine, and surfactant.
- the equilibrium voltage on the back surface of at least one of the release sheets is 100 V or less.
- the equilibrium voltage on the back surface of the release sheet having a higher peel strength is 100 V or less. Is preferred.
- This balanced voltage is an index indicating the property of being hardly charged with static electricity, and if it is 100 V or less, it can be evaluated that it is difficult to be charged with static electricity.
- the charged voltage half-life time of the pressure-sensitive adhesive layer exposed when peeling at least one of the release sheets is less than 60 seconds.
- the pressure-sensitive adhesive exposed when the release sheet having a higher peel strength is peeled off
- the half-charge time of the adhesive surface of the layer is less than 60 seconds.
- This charged voltage half time is an index that is excellent in the static elimination effect, and can be evaluated as excellent in the static elimination effect if it is less than 60 seconds. From this viewpoint, it is more preferably less than 40 seconds, and more preferably less than 30 seconds.
- the pressure-sensitive adhesive layer 2 is formed from a transparent material, for example, in a liquid crystal display member, the space layer between the polarizing plate and its upper member is filled with a pressure-sensitive adhesive sheet to improve the visibility. It can be suitably used when manufacturing an image display device.
- Example 1 Of a polyethylene terephthalate film (Nippa PET “75-1-K0-ASI5”, thickness 75 ⁇ m) 5A (: support 1 in Table 1) in which a conductive layer 5C and a release layer 5D are laminated in this order on one side of the film
- a conductive material paint (“Neocon Coat 567” manufactured by Dainichi Seika Kogyo Co., Ltd.) was applied and dried to form a conductive layer 5B, thereby creating a release sheet 5.
- a polyethylene terephthalate film (Nippa PET “38-1-A3”, thickness 38 ⁇ m) 7A (support 2 in Table 1) having a release layer 7B formed on one side of the film is provided. Using.
- an adhesive polymer (A) obtained by copolymerizing 75 parts by weight of 2-ethylhexyl acrylate, 22 parts by weight of methyl acrylate and 3 parts by weight of acrylic acid, 1 part by weight of pentaerythritol triacrylate as a crosslinking agent and photopolymerization
- a pressure-sensitive adhesive composition prepared by mixing 3 parts by weight of 2-benzoylbenzoic acid as an initiator was applied to a thickness of 150 ⁇ m with an applicator, and as shown in FIG.
- the pressure-sensitive adhesive layer is crosslinked by irradiating ultraviolet rays from both sides through the release sheet 5 and the release sheet 7, and a double-sided pressure-sensitive adhesive sheet with release sheet (conductive layer / PET / conductive layer / release layer // A pressure-sensitive adhesive layer // release layer / PET) was prepared.
- the peeling strength when peeling sheet 5 and peeling sheet 7 were peeled from adhesive 6 at a peeling angle of 90 ° and a peeling speed of 300 mm / min were 95 g / 50 mm and 52 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 7 and the pressure-sensitive adhesive layer 6.
- Example 2 Polyethylene terephthalate film kneaded with conductive material ("Lumirror X53" manufactured by Toray, thickness 100 ⁇ m) 8A (: Support 1 in Table 1) 100 parts by weight of addition type silicone (Toray Dow Corning SD7320)
- a release agent composition formed by mixing 0.5 parts by weight of a platinum catalyst for curing (NC-25 manufactured by Toray Dow Corning Co., Ltd.) is applied and dried to form a release layer 8B, thereby creating a release sheet 8 did.
- the release sheet 8 was used instead of the release sheet 7, the double-sided pressure-sensitive adhesive sheet with release sheet (PET / release layer kneaded with conductive material / / Adhesive layer // Peel layer / PET).
- the peeling strength when peeling sheet 8 and peeling sheet 7 were peeled from adhesive 6 at a peeling angle of 90 ° and a peeling speed of 300 mm / min were 180 g / 50 mm and 50 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 7 and the pressure-sensitive adhesive layer 6.
- Example 3 As one release sheet 9, a polyethylene terephthalate film in which a conductive layer 9B and a release layer 9C are laminated in this order on one side of the film (Nippa PET “75-1-K2-ASI5”, thickness 75 ⁇ m) (: Table 1) 1) was used. On the other hand, on the surface of the polyethylene terephthalate film (Panacle “Panaclea AS-F”, 75 ⁇ m) (: Support 2 in Table 1) on which the conductive layer is not formed, the silicone resin (KS manufactured by Shin-Etsu Silicone Co., Ltd.) is provided.
- the silicone resin KS manufactured by Shin-Etsu Silicone Co., Ltd.
- Conductive layer / release layer // adhesive layer // release layer / PET / conductive layer).
- the peeling strength when peeling sheet 9 and peeling sheet 10 were peeled from adhesive 6 at a peeling angle of 90 ° and a peeling speed of 300 mm / min were 130 g / 50 mm and 60 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 10 and the pressure-sensitive adhesive layer 6.
- Example 1 As shown in FIG. 5, in Example 1, instead of the release sheet 5, a release sheet comprising a polyethylene terephthalate film 11 ⁇ / b> A (support 1 in Table 1) and a release layer 11 ⁇ / b> B (“PET75-1-KX0 made by Nippers”). A double-sided pressure-sensitive adhesive sheet with a release sheet (PET / release layer // pressure-sensitive adhesive layer // release layer / PET) was prepared in the same manner as in Example 1 except that the thickness of 75 ⁇ m) 11 was used.
- a release sheet comprising a polyethylene terephthalate film 11 ⁇ / b> A (support 1 in Table 1) and a release layer 11 ⁇ / b> B (“PET75-1-KX0 made by Nippers”).
- a double-sided pressure-sensitive adhesive sheet with a release sheet (PET / release layer // pressure-sensitive adhesive layer // release layer / PET) was prepared in the same manner as in Example 1 except that the thickness of 75 ⁇ m) 11 was used.
- the release strength when the release sheet 11 and the release sheet 7 were peeled from the adhesive 6 at a release angle of 90 ° and a release speed of 300 mm / min were 100 g / 50 mm and 48 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 7 and the pressure-sensitive adhesive layer 6.
- Example 2 As shown in FIG. 6, in Example 3, a double-sided pressure-sensitive adhesive sheet with a release sheet (PET / PET) was used in the same manner as in Example 3 except that the release sheet 11 used in Comparative Example 1 was formed instead of the release sheet 9. Release layer // adhesive layer // release layer / PET / conductive layer).
- the peeling strength when peeling sheet 11 and peeling sheet 10 were peeled from adhesive 6 at a peeling angle of 90 ° and a peeling speed of 300 mm / min were 90 g / 50 mm and 60 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 10 and the pressure-sensitive adhesive layer 6.
- Example 3 As shown in FIG. 7, in Example 1, a double-sided pressure-sensitive adhesive sheet with a release sheet (PET / PET) was used in the same manner as in Example 1 except that the release sheet 9 used in Example 3 was used instead of the release sheet 5.
- the peeling strength when peeling sheet 9 and peeling sheet 7 were peeled from adhesive 6 at a peeling angle of 90 ° and a peeling speed of 300 mm / min were 143 g / 50 mm and 50 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 7 and the pressure-sensitive adhesive layer 6.
- Example 4 As shown in FIG. 8, in Example 1, the release sheet 9 used in Example 3 was used instead of the release sheet 5, while the polyethylene terephthalate film 12 ⁇ / b> A (: support of Table 1 was used instead of the release sheet 7). 2) With release sheet as in Example 1 except that a release sheet (PET “75-1-HSP-ASI5”, thickness 75 ⁇ m) 12 having a conductive layer 12B and a release layer 12C on one side was used. A double-sided pressure-sensitive adhesive sheet (PET / conductive layer / release layer // pressure-sensitive adhesive layer // release layer / conductive layer / PET) was prepared.
- the peeling strength when peeling sheet 9 and peeling sheet 12 were peeled from adhesive 6 at a peeling angle of 90 ° and a peeling speed of 300 mm / min were 180 g / 50 mm and 52 g / 50 mm, respectively. It was confirmed that the peel strength between the pressure-sensitive adhesive layers 6 was larger than the peel strength between the release sheet 12 and the pressure-sensitive adhesive layer 6.
- the pressure-sensitive adhesive layer side of any one release sheet and at least one release If the surface opposite to the pressure-sensitive adhesive layer of the sheet, that is, the back surface is electrically conductive, even if static electricity is generated when the release sheet is peeled off, the pressure-sensitive adhesive layer can be prevented from being charged. It was found that even when static electricity is generated due to friction, charging of the pressure-sensitive adhesive layer can be prevented. Above all, when the peel strength between one release sheet and the adhesive layer is different from the peel strength between the other release sheet and the adhesive layer, the release sheet or adhesive layer has a larger peel strength. It was found that charging can be more effectively prevented by imparting conductivity to the agent layer side.
- the charged voltage on the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer exposed when the balance voltage on the back surface of at least one of the release sheets is 100 V or less and at least one of the release sheets is peeled off. It has been found that a half-time of less than 60 seconds is preferable in terms of static electricity decay behavior. In consideration of the release charge, the half of the equilibrium voltage of the pressure-sensitive adhesive surface exposed by peeling the release sheet (support 2) is less than 60 seconds, and any one release sheet is released for 15 seconds. It has been found that the subsequent charging voltage is preferably less than 2.0 kV.
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Abstract
Description
また最近では、このような光学部材を単に貼り合せる目的だけではなく、視認性を向上させるため、例えば液晶表示部材においては、偏光板とその上部の部材との空間層を粘着剤シートで充填して視認性を向上させる目的でも、剥離シート付両面粘着剤シートが用いられている。
その他、多くの分野において、部材同士の貼合や固定の為に、剥離シート付両面粘着剤シートが多用されている。
特許文献2には、側鎖に水酸基及びアルキレンオキサイド鎖を有するアクリル系共重合体(A)、イオン化合物(B)、硬化剤(C)及び酸化防止剤(D)を含有してなる帯電防止粘着剤が開示されている。
特許文献3には、帯電防止性カバーフィルム、ポリビニルアルコール系の粘着防止層、感光性樹脂層および支持フィルムを有する帯電防止性感光性積層体が開示されている。
しかし、剥離シートを剥離する以外の場合、例えば剥離シート付両面粘着剤シートを巻取体としたり、裁断したり、保管時や運搬時に剥離シート付両面粘着剤シート同士を重ねたりした際にも静電気が生じて帯電して様々な作業の支障となることがあった。
また、少なくとも何れか一方の剥離シートの粘着剤層とは反対側の面すなわち背面が導電性を有していれば、例えば剥離シート付両面粘着剤シートを巻取体としたり、裁断したり、剥離シート付両面粘着剤シート同士を重ねたりした際に静電気が発生しても、当該背面を通じて静電気を逃がして除電することができるから、剥離シート付両面粘着剤シートは帯電することがない。
よって、本発明の剥離シート付両面粘着剤シートによれば、粘着剤シートから剥離シートを剥離した時ばかりではなく、剥離シート付両面粘着剤シートを巻取体としたり、裁断したり、剥離シート付両面粘着剤シート同士を重ねたりした時にも、剥離シート付両面粘着剤シートが静電気を帯電することのないようにすることができる。
したがって、本発明の剥離シート付両面粘着剤シートは、特に静電気を嫌う用途、例えば携帯電話機、PHS機、PDA端末、ポータブル・ゲーム機、パソコン、自動車用ナビゲーター、デジタルカメラ等の電子機器や、高い環境信頼性を求める自動車産業用などに好適に用いることができる。
この際、粘着剤層2自体、或いは粘着剤層2の粘着面(2a、2b)は、導電性を有していてもよいし、有していなくてもよい。
また、本粘着シートは、剥離シート1、粘着剤層2及び剥離シート3以外の層を備えていてもよい。
例えば、図1(A)に示すように、粘着剤層3の粘着剤層側3a及びその背面3bのみが導電性を有するように構成することもできるし、また、図1(B)に示すように、剥離シート1の粘着剤層側1aと、他方の剥離シート3の粘着剤層とは反対側の面すなわち背面3bのみが導電性を有するように構成することもできる。図1(C)に示すように、粘着剤層1の粘着剤層側1a及びその背面1bと、粘着剤層3の粘着剤層側3a及びその背面3bが導電性を有するように構成することもできる。また、図1(D)に示すように、剥離シート1の粘着剤層とは反対側の面すなわち背面1bと、粘着剤層3の粘着剤層側3a及びその背面3bとが導電性を有するように構成することもできる。さらには、図1(E)に示すように、剥離シート1の粘着剤層側1aと、剥離シート3の粘着剤層側3a及びその背面3bが導電性を有するように構成することもできるし、また、図1(F)に示すように、剥離シート1の背面1bと、剥離シート3の粘着剤層側3aが導電性を有するように構成することもできる。
このように剥離シート1、粘着剤層2間の剥離強度よりも、他方の剥離シート3、粘着剤層2間の剥離強度を大きくする場合には、剥離強度のより大きな剥離シート3の背面3bが導電性を有するように構成するようにしてもよいが、それよりも、図1(A)(C)(D)(E)及び(F)に示されるように、剥離強度のより大きな剥離シート3の粘着剤層側3aが導電性を有するように構成するのがより一層好ましい。
剥離強度のより大きな剥離シート3、すなわち2枚の剥離シート1,3のうちの後に残る方の剥離シート3の粘着剤層側3aに導電性を持たせておれば、例えば剥離シート1を剥がして被着体に本粘着シートを貼着する際、剥離シート1を剥がした際に生じる静電気を、剥離シート3の粘着剤層側3aを通じて逃がすことができるばかりか、次いで、剥離シート3を剥がした際に静電気が生じたとしても、粘着剤層側3aを通じて逃がすことができる点で好ましい。
このように、後に残る剥離シート3の背面3bが導電性を有していれば、例えば剥離シート1を剥がして被着体に本粘着シートを粘着した状態で裁断したり、重ねたりして静電気が発生しても、当該背面3bを通じて静電気を逃がすことができるから、粘着剤層2を帯電させることがない。
剥離シート1及び剥離シート3の一側又は両側が導電性を有するように形成するには、剥離シート1及び3の一側又は両側に導電層を形成するようにすればよい。この際、剥離層を形成する側は、導電層の外側に剥離層が形成されることになるが、剥離層は薄いために表面に導電層が位置しなくても、この表面は導電性を有することになる。
また、剥離シート1及び剥離シート3の両側が導電性を有するように形成するには、導電材料を練り込んで剥離シート1及び剥離シート3を成形し、剥離シート1及び剥離シート3全体が導電性を有するように、言い換えれば剥離シート1及び剥離シート3自体が導電層となるように形成することもできる。
以下、詳細に説明する。
導電層は、導電材を含有する層として形成すればよい。例えば導電材と、バインダーや架橋剤を含有する組成物を、剥離シートの表面にコーティングして形成することができる。
粘着剤層は、現在公知の粘着剤組成物を用いて形成することができ、例えば一体型画像表示装置などの光学材料を接着するのに用いる場合には、透明な材料から形成するのが好ましい。
また、基材レスとすることで、粘着材層のもつ柔軟性が損なわれず、屈曲性や被着体への追随性に優れるばかりか、屈折率の異なる積層体とした際に起こり得る透過光の干渉や、基材由来の異方性やヘイズによって粘着シートの等方性や透明性が損なわれるなどの光学的な品質低下のおそれがなく、好ましい。
上記ベースポリマーの中でも、アクリル系、特に(メタ)アクリル酸エステル重合体(共重合体を含む)をベースポリマーとして用い、これを架橋して粘着剤層を形成するのが好ましい。
イソシアネート系架橋剤としては、トリレンジイソシアネート、クロルフェニレンジイソシアナート、ヘキサメチレンジイソシアナート、テトラメチレンジイソシアナート、イソホロンジイソシアネート、キシリレンジイソシアネート、ジフェニルメタンジイソシアネート、水添されたジフェニルメタンジイソシアネートなどのイソシアネートモノマー及びこれらイソシアネートモノマーをトリメチロールプロパンなどと付加したイソシアネート化合物やイソシアヌレート化物、ビュレット型化合物、さらには公知のポリエーテルポリオールやポリエステルポリオール、アクリルポリオール、ポリブタジエンポリオール、ポリイソプレンポリオールなど付加反応させたウレタンプレポリマー型のイソシアネートなどを挙げることができる。
架橋モノマーとしては、アクリル系架橋モノマーを用いるのが好ましく、中でも、単官能(メタ)アクリレートよりは、2官能(メタ)アクリレート、3官能(メタ)アクリレート、4官能(メタ)アクリレートなどの多官能(メタ)アクリレート、若しくは、単官能~4官能(メタ)アクリレートの2種以上が混合してなる混合物が好ましい。
単官能(メタ)アクリレートとしては、アクリル酸、メタタクリル酸及びクロトン酸等の(メタ)アクリル酸類、ラウリルアクリレート、2-エチルヘキシルアクリレート、2-ヒドロキシエチルアクリレート、2-ヒドロキシプオピルアクリレート、テトラヒドロフルフリールアクリレート、1,6-ヘキサンジオールモノアクリレートおよびジシクロペンタンジエンアクリレート等を挙げることができる。
3官能(メタ)アクリレートとしては、ペンタエリスリトールトリアクリレート、トリメチロールプロパントリアクリレート、トリメチロールプロパンPO変性トリアクリレート、トリメチロールプロパンEO変性トリアクリレート等のトリアクリレートや、それらのトリメタクリレート等を挙げることができる。
4官能(メタ)アクリレートとしては、ジトリメチロールプロパンテトラアクリレート、ペンタエリスリトールテトラアクリレート等を挙げることができる。
光開始剤としては、開裂型の光開始剤及び水素引抜型の光開始剤のいずれを用いることもでき、中でも水素引抜型光開始剤が好ましい。水素引抜型光開始剤としては、例えばベンゾフェノン、ミヒラーケトン、ジベンゾスベロン、2-エチルアントラキノン、イソブチルチオキサンソンやなどのいずれかもしくはその誘導体、或いはこれらの二種類以上の組み合わせからなる混合成分を用いることができる。但し、水素引抜型の光開始剤として前記に挙げた物質に限定するものではない。また、水素引抜型と開裂型とを種々の割合で併用してもよい。
光開始剤の添加量は、特に制限されるものではなく、一般的にはベースポリマー100質量部に対し0.1~5質量部の割合の範囲内で調整するのがよい。但し、他の要素とのバランスでこの範囲を超えてもよい。
剥離シートは、離型支持フィルムの何れか一面に離型層(「剥離層」とも称する)を設けて形成することができる。
支持フィルムの厚みは好ましくは25μm~250μm、より好ましくは50μm~125μmである。
本粘着シートは、JIS L1094に準じて測定される剥離シート付両面粘着剤シートの帯電圧が、以下の条件(1)及び(2)を満たすのが好ましい。
中でも、一方の剥離シート、粘着剤層間の剥離強度と、他方の剥離シート、粘着剤層間の剥離強度とを異ならしめる場合には、剥離強度のより大きな剥離シートの背面の平衡帯電圧が100V以下であるのが好ましい。
この平衡帯電圧は、静電気を帯び難い性質を示す指標であり、100V以下であれば静電気を帯び難いと評価することができる。
中でも、一方の剥離シート、粘着剤層間の剥離強度と、他方の剥離シート、粘着剤層間の剥離強度とを異ならしめる場合には、剥離強度のより大きな剥離シートを剥離した際に露出する粘着剤層の粘着面の帯電圧半減時間が60秒未満であるのが好ましい。
この帯電圧半減時間は、除電効果に優れている指標であり、60秒未満であれば除電効果に優れていると評価することができる。かかる観点から、40秒未満であるのがより好ましく、特に30秒未満であるのがより好ましい。
本粘着シートは、粘着剤シートから剥離シートを剥離した際に静電気が発生しても、静電気を逃がして除電することができるから、帯電することがない。また、本粘着シートを巻取体としたり、裁断したり、本粘着シート同士を重ねたりした際に静電気が発生しても、静電気を逃がして除電することができるから、帯電することがない。
よって、本粘着シートは、特に静電気を嫌う用途、例えば携帯電話機、PHS機、PDA端末、ポータブル・ゲーム機、パソコン、自動車用ナビゲーター、デジタルカメラ等の電子機器や、高い環境信頼性を求める自動車産業用などに好適に用いることができる。
特に粘着剤層2を透明な材料から形成することにより、例えば液晶表示部材においては、偏光板とその上部の部材との空間層を粘着剤シートで充填して視認性を向上させるなど、一体型画像表示装置を製造する際に好適に用いることができる。
フィルムの一側に導電層5C及び剥離層5Dがこの順に積層されたポリエチレンテレフタレートフィルム(ニッパ製PET「75-1-K0-ASI5」、厚さ75μm)5A(:表1の支持体1)の他側面に、導電材塗料(大日精化工業株式会社製「ネオコンコート567」)を塗布乾燥して導電層5Bを形成して剥離シート5を作成した。
他方の剥離シート7には、フィルムの一側に剥離層7Bが形成されたポリエチレンテレフタレートフィルム(ニッパ製PET「38-1-A3」、厚さ38μm)7A(:表1の支持体2)を用いた。
導電材を練り込んでなるポリエチレンテレフタレートフィルム(東レ製「ルミラーX53」、厚さ100μm)8A(:表1の支持体1)の片面に、付加型シリコーン(東レダウコーニング社製SD7320)100重量部に対し、硬化用白金触媒(東レダウコーニング社製NC-25)0.5重量部を混合してなる離型剤組成物を塗布乾燥して剥離層8Bを形成して、剥離シート8を作成した。
図3に示すように、実施例1において、剥離シート7の代わりに剥離シート8を用いた以外は、実施例1と同様に剥離シート付両面粘着剤シート(導電材練り込みPET/剥離層//粘着剤層//剥離層/PET)を作成した。
一方の剥離シート9として、フィルムの一側に導電層9B及び剥離層9Cがこの順に積層されたポリエチレンテレフタレートフィルム(ニッパ製PET「75-1-K2-ASI5」、厚さ75μm)(:表1の支持体1)を用いた。
他方、導電層10Bを有するポリエチレンテレフタレートフィルム(パナック製「パナクレア AS-F」、75μm)(:表1の支持体2)の導電層が形成されていない面に、シリコーン樹脂(信越シリコーン社製KS-779H)100重量部に対し硬化剤(信越シリコーン社製CAT-PL-50T)1重量部を混合して得た離型剤組成物を塗布乾燥して剥離層10Cを形成し、剥離シート10を作成した。
図4に示すように、実施例1において、剥離シート5及び剥離シート7の代わりに剥離シート9及び剥離シート10を用いた以外は、実施例1と同様に剥離シート付両面粘着剤シート(PET/導電層/剥離層//粘着剤層//剥離層/PET/導電層)を作成した。
図5に示すように、実施例1において、剥離シート5の代わりに、ポリエチレンテレフタレートフィルム11A(:表1の支持体1)と剥離層11Bとからなる剥離シート(ニッパ製「PET75-1-KX0」、厚さ75μm)11を用いた以外は、実施例1と同様に剥離シート付両面粘着剤シート(PET/剥離層//粘着剤層//剥離層/PET)を作成した。
図6に示すように、実施例3において、剥離シート9の代わりに、比較例1で用いた剥離シート11を形成した以外は、実施例3と同様に剥離シート付両面粘着剤シート(PET/剥離層//粘着剤層//剥離層/PET/導電層)を作成した。
図7に示すように、実施例1において、剥離シート5の代わりに、実施例3で用いた剥離シート9を用いた以外は、実施例1と同様に剥離シート付両面粘着剤シート(PET/導電層/剥離層//粘着剤層//剥離層/PET)を作成した。
剥離シート9及び剥離シート7を、粘着剤6から、剥離角90°、剥離速度300mm/分にて剥離した際の剥離強度は、其々143g/50mm、50g/50mmであり、剥離シート9、粘着剤層6間の剥離強度は、剥離シート7、粘着剤層6間の剥離強度よりも大きいことが確認された。
図8に示すように、実施例1において、剥離シート5の代わりに、実施例3で用いた剥離シート9を用いる一方、剥離シート7の代わりに、ポリエチレンテレフタレートフィルム12A(:表1の支持体2)の一面に導電層12B及び剥離層12Cを有する剥離シート(ニッパ製PET「75-1-HSP-ASI5」、厚さ75μm)12を用いた以外は、実施例1と同様に剥離シート付両面粘着剤シート(PET/導電層/剥離層//粘着剤層//剥離層/導電層/PET)を作成した。
剥離シート9及び剥離シート12を、粘着剤6から、剥離角90°、剥離速度300mm/分にて剥離した際の剥離強度は、其々180g/50mm、52g/50mmであり、剥離シート9、粘着剤層6間の剥離強度は、剥離シート12、粘着剤層6間の剥離強度よりも大きいことが確認された。
実施例1~3及び比較例1~4にて用いた支持体と、作成した剥離シート付両面粘着剤シートとについて以下の測定を行った。結果は表1に示す。
支持体1及び2の外側表面(すなわち背面)、及び、剥離強度が低い側の剥離シート(支持体2)を剥離して露出した粘着剤層の粘着面に、+10kVの電圧を印加した時の平衡帯電圧と、その印加を停止した後の帯電圧半減時間を、シシド静電気株式会社製スタティックオネストメータH-0110を用いて測定した。
剥離シート付両面粘着剤シートを200mm×50mmの短冊状に裁断し、剥離強度が低い側の剥離シート(支持体2)を剥離角90°、剥離速度300mm/分にて剥離し、次いで、剥離強度が高い側の剥離シート(支持体1)を剥離角90°、剥離速度300mm/分にて剥離し、それぞれ露出した粘着剤層の粘着面の15秒後の帯電圧を、シムコジャパン株式会社製静電気測定機FMX-003を用いて、測定距離25mmにて測定した。
摩擦帯電については、測定1において、何れか一方の剥離シートの平衡帯電圧が100V以下であれば、「○」と判定し、100Vを超える場合を「×」と判定した。
剥離帯電については、測定1において、剥離シート(支持体2)を剥離して露出した粘着面の平衡帯電圧の半減時間が60秒未満であり、且つ測定2において、何れか一方の剥離シートを剥離15秒後の帯電圧が2.0kV未満であれば「○」、それ以外を「×」と判定した。
中でも、一方の剥離シート、粘着剤層間の剥離強度と、他方の剥離シート、粘着剤層間の剥離強度とが異なる場合に、剥離シート、粘着剤層間の剥離強度がより大きい方の剥離シートの粘着剤層側に、導電性を持たせることで、より一層効果的に帯電を防ぐことができることが分かった。
また、剥離帯電についても考慮すると、剥離シート(支持体2)を剥離して露出した粘着面の平衡帯電圧の半減時間が60秒未満であり、且つ、何れか一方の剥離シートを剥離15秒後の帯電圧が2.0kV未満であるのが好ましいことが分かった。
Claims (6)
- 粘着剤層と、粘着剤層の上下両側に積層してなる2枚の剥離シートとを備えた剥離シート付両面粘着剤シートであって、
一方の剥離シート、粘着剤層間の剥離強度と、他方の剥離シート、粘着剤層間の剥離強度とが異なり、
少なくとも何れか一方の剥離シートの粘着剤層側と、少なくとも何れか一方の剥離シートの粘着剤層とは反対側の面すなわち背面とが、導電性を有することを特徴とする剥離シート付両面粘着剤シート。 - 剥離シート、粘着剤層間の剥離強度がより大きい方の剥離シートの粘着剤層側が、導電性を有することを特徴とする請求項1記載の剥離シート付両面粘着剤シート。
- 剥離シート、粘着剤層間の剥離強度がより大きい方の剥離シートの粘着剤層側と、何れか一方の剥離シートの背面とが、導電性を有することを特徴とする請求項1又は2に記載の剥離シート付両面粘着剤シート。
- JIS L1094に準じて測定される剥離シート付両面粘着剤シートの帯電圧が、以下の条件(1)及び(2)を満たすことを特徴とする請求項1~3の何れかに記載の剥離シート付両面粘着剤シート。
(1) 少なくとも何れか一方の剥離シートの背面の平衡帯電圧が100V以下である。
(2) 少なくとも何れか一方の剥離シートを剥離した際に露出する粘着剤層の粘着面の帯電圧半減時間が60秒未満である。 - 粘着剤層が、透明な材料からなることを特徴とする請求項1~4のいずれか記載の剥離シート付両面粘着剤シート。
- 請求項1~5の何れかに記載の剥離シート付両面粘着剤シートを用いて、一体型画像表示装置を製造することを特徴とする、一体型画像表示装置の製造方法。
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KR101427617B1 (ko) | 2014-08-07 |
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