WO2014181853A1 - 積層粘着シート及び積層体 - Google Patents

積層粘着シート及び積層体 Download PDF

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Publication number
WO2014181853A1
WO2014181853A1 PCT/JP2014/062431 JP2014062431W WO2014181853A1 WO 2014181853 A1 WO2014181853 A1 WO 2014181853A1 JP 2014062431 W JP2014062431 W JP 2014062431W WO 2014181853 A1 WO2014181853 A1 WO 2014181853A1
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Prior art keywords
pressure
sensitive adhesive
adhesive layer
laminated
dielectric constant
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PCT/JP2014/062431
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English (en)
French (fr)
Japanese (ja)
Inventor
山本　真之
絵美 高草木
立治 石田
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王子ホールディングス株式会社
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Application filed by 王子ホールディングス株式会社 filed Critical 王子ホールディングス株式会社
Priority to CN201480025770.XA priority Critical patent/CN105229100B/zh
Priority to KR1020157034897A priority patent/KR101894734B1/ko
Priority to JP2015515901A priority patent/JP6354752B2/ja
Publication of WO2014181853A1 publication Critical patent/WO2014181853A1/ja

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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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • 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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • 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
    • C09J7/22—Plastics; Metallised plastics
    • 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]
    • 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
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C09J2301/1242—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • the present invention relates to a laminated adhesive sheet and a laminated body. Specifically, the present invention relates to a laminated pressure-sensitive adhesive sheet having a controlled dielectric constant and capable of exhibiting desired adhesiveness.
  • LCD liquid crystal display
  • input devices used in combination with a display device such as a touch panel
  • transparent double-sided pressure-sensitive adhesive sheets are used for bonding optical members
  • transparent double-sided pressure-sensitive adhesive sheets are also used for bonding between display devices and input devices.
  • Patent Document 4 discloses a laminated pressure-sensitive adhesive sheet having different dielectric constants.
  • Patent Document 5 discloses a single-layer type pressure-sensitive adhesive sheet having a specific dielectric constant and dielectric loss tangent. As described above, it has been proposed to improve the operation performance of the touch panel by controlling the dielectric constant of the adhesive sheet.
  • the dielectric constant of the pressure-sensitive adhesive sheet is required to be controlled within a predetermined range according to the performance required for the display device and the input device.
  • the relative dielectric constant is a physical property value specific to a substance, it is not always easy to control with high accuracy, and it has been desired to find a method for controlling the relative dielectric constant more accurately.
  • the present inventors have found a method for controlling the relative permittivity more accurately in order to solve the problems of the conventional technology, and provide an adhesive sheet whose relative permittivity is controlled by the control method. We proceeded with a study for this purpose.
  • the present inventors have determined that the ratio of the first pressure-sensitive adhesive layer in the laminated pressure-sensitive adhesive sheet having at least the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer. It was found that the relative dielectric constant of the laminated adhesive sheet can be adjusted by adjusting the dielectric constant and thickness and the relative dielectric constant and thickness of the second pressure-sensitive adhesive layer to satisfy specific conditions. Thus, the present inventors succeeded in obtaining a laminated pressure-sensitive adhesive sheet having a controlled relative dielectric constant, and completed the present invention. Specifically, the present invention has the following configuration.
  • a laminated pressure-sensitive adhesive sheet having at least a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer, wherein a difference in relative dielectric constant between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a frequency of 1 MHz
  • a laminated pressure-sensitive adhesive sheet having an absolute value of 0.5 or more.
  • a laminated pressure-sensitive adhesive sheet having at least a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer, a first pressure-sensitive adhesive layer having a relative dielectric constant at a frequency of 1 MHz of less than 4, and a relative dielectric constant at a frequency of 1 MHz Has 4 or more 2nd adhesive layers, The laminated adhesive sheet as described in [1] characterized by the above-mentioned.
  • a relative dielectric constant adjusting method wherein the relative dielectric constant of the laminated adhesive sheet is adjusted by adjusting the rate and the thickness, respectively.
  • the relative dielectric constant and thickness of the first pressure-sensitive adhesive layer at a frequency of 1 MHz and the relative dielectric constant and thickness of the second pressure-sensitive adhesive layer at a frequency of 1 MHz are adjusted using the following formula (1).
  • n the number of layers of the pressure-sensitive adhesive layer.
  • a method for producing a laminated pressure-sensitive adhesive sheet comprising:
  • the present invention it is possible to provide a method for controlling the relative dielectric constant more accurately in the laminated adhesive sheet. For this reason, in this invention, the lamination adhesive sheet which has a desired dielectric constant can be obtained. Further, in the present invention, since the relative dielectric constant can be accurately controlled in the laminated adhesive sheet, the production efficiency of the laminated adhesive sheet can be increased, and the detailed needs required when producing a laminate are met. I can do things.
  • FIG. 1 is a schematic cross-sectional view of the laminated pressure-sensitive adhesive sheet of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing another aspect of the laminated pressure-sensitive adhesive sheet of the present invention.
  • a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • the present invention relates to a laminated pressure-sensitive adhesive sheet having at least a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer.
  • the absolute value of the difference in relative dielectric constant at a frequency of 1 MHz between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is 0.5 or more.
  • the dielectric constant in the frequency 1MHz of the 1st adhesive layer of the laminated adhesive sheet of this invention is less than 4, and the dielectric constant in the frequency 1MHz of the 2nd adhesive layer is 4 or more.
  • the laminated pressure-sensitive adhesive sheet of the present invention can function as a double-sided pressure-sensitive adhesive sheet having at least a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer.
  • the laminated pressure-sensitive adhesive sheet 10 has a first pressure-sensitive adhesive layer 1 and a second pressure-sensitive adhesive layer 2.
  • the laminated pressure-sensitive adhesive sheet 10 is composed of only the first pressure-sensitive adhesive layer 1 and the second pressure-sensitive adhesive layer 2, but has other functional layers and pressure-sensitive adhesive layers. It may be.
  • the laminated pressure-sensitive adhesive sheet 10 of the present invention includes a third pressure-sensitive adhesive layer 3 in addition to the first pressure-sensitive adhesive layer 1 and the second pressure-sensitive adhesive layer 2. You may have.
  • the laminated pressure-sensitive adhesive sheet 10 has a functional layer other than the pressure-sensitive adhesive layer, at least one of the first pressure-sensitive adhesive layer 1, the second pressure-sensitive adhesive layer 2, and the third pressure-sensitive adhesive layer 3 is the outermost layer. Placed in.
  • the absolute value of the difference in relative dielectric constant between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is 0.5 or more.
  • the absolute value of the difference in relative dielectric constant between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is preferably 1 or more, and more preferably 2 or more.
  • the relative permittivity of the first pressure-sensitive adhesive layer at a frequency of 1 MHz is preferably less than 4, more preferably less than 3, further preferably less than 2.5, and less than 2. Even more preferably.
  • the relative dielectric constant of the first pressure-sensitive adhesive layer can be controlled more efficiently. It is also possible to keep the relative dielectric constant of the entire laminated adhesive sheet low.
  • the relative dielectric constant at a frequency of 1 MHz of the second pressure-sensitive adhesive layer is preferably 4 or more, more preferably 4.5 or more, further preferably 5 or more, and 5.5 or more. Is even more preferable.
  • the relative dielectric constant of the first pressure-sensitive adhesive layer at a frequency of 1 MHz and the relative dielectric constant of the second pressure-sensitive adhesive layer at a frequency of 1 MHz are set to a specific range, thereby controlling the relative dielectric constant of the entire laminated adhesive sheet. can do.
  • the relative dielectric constant ( ⁇ ) in the present invention can be obtained by a method defined in JIS-C-2138.
  • the ratio of the thickness of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is preferably 1:99 to 99: 1.
  • the relative dielectric constant of the entire laminated pressure-sensitive adhesive sheet can be controlled.
  • the relative dielectric constant of the whole laminated pressure-sensitive adhesive sheet can be controlled by providing the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer under specific conditions.
  • the relative permittivity of the laminated adhesive sheet can be controlled by adjusting the relative permittivity and thickness of the first adhesive layer and the relative permittivity and thickness of the second adhesive layer, respectively. it can.
  • the relative dielectric constant and thickness of the first pressure-sensitive adhesive layer and the relative dielectric constant and thickness of the second pressure-sensitive adhesive layer can be adjusted using the following formula (1).
  • ⁇ represents the relative dielectric constant of the entire laminated adhesive sheet
  • d represents the thickness of the entire laminated adhesive sheet.
  • epsilon n represents the dielectric constant of the adhesive layer
  • d n represents the thickness of each adhesive layer. Note that n represents the number of pressure-sensitive adhesive layers.
  • the dielectric constant and thickness of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer using the above formula (1)
  • the relative dielectric constant and thickness can be calculated. That is, if the relative dielectric constant required for the laminated adhesive sheet is determined and the thickness of the required laminated adhesive sheet is determined, the relative dielectric constant and thickness of the first adhesive layer and the second adhesive layer are calculated. be able to.
  • the dielectric constant is preferably adjusted under the following conditions.
  • d 1 to d n can be determined so as to be a specific ⁇ under conditions where ⁇ 1 to ⁇ n are fixed.
  • epsilon n and d n are fixed, and ⁇ 1 ⁇ ⁇ n-1, it is possible to determine the d 1 ⁇ d n-1.
  • a desired dielectric constant can be obtained while selecting a pressure-sensitive adhesive having an adhesive property according to the adherend using the above formula (1).
  • a laminated pressure-sensitive adhesive sheet having the following can be formed.
  • n is preferably 2 to 6, more preferably 2 to 4, and still more preferably 2 or 3.
  • the laminated pressure-sensitive adhesive sheet of the present invention may have a third pressure-sensitive adhesive layer.
  • the third pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer having the same dielectric constant as the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer that is not adjacent to each other.
  • it may be a pressure-sensitive adhesive layer having the same dielectric constant as the adjacent first pressure-sensitive adhesive layer or second pressure-sensitive adhesive layer. That is, the third pressure-sensitive adhesive layer may have the same dielectric constant as that of the adjacent pressure-sensitive adhesive layer, or may have a different relative dielectric constant.
  • the dielectric constant of the 1st adhesive layer and the 3rd adhesive layer is It may be the same.
  • the third pressure-sensitive adhesive layer may be a pressure-sensitive adhesive layer having a relative dielectric constant different from any of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer.
  • the absolute difference between the relative dielectric constant of the third pressure-sensitive adhesive layer and the relative dielectric constant of the adjacent first pressure-sensitive adhesive layer or second pressure-sensitive adhesive layer is preferably 0.5 or more, more preferably 1 or more, and even more preferably 2 or more.
  • the absolute value of the difference in relative dielectric constant between all the adhesive layers is also preferably within the above range.
  • the absolute value of the difference between the relative dielectric constant of the first pressure-sensitive adhesive layer and the relative dielectric constant of the second pressure-sensitive adhesive layer is preferably within the above range, and the relative dielectric constant of the second pressure-sensitive adhesive layer
  • the absolute value of the difference in relative dielectric constant of the pressure-sensitive adhesive layer 3 is preferably within the above range, and the absolute value of the difference in relative dielectric constant between the first pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer is within the above range. It is preferable that
  • the laminated pressure-sensitive adhesive sheet having a three-layered or more pressure-sensitive adhesive layer, in the above formula (1) under conditions epsilon 1 and epsilon n, d 1 and d n are fixed, ⁇ 2 ⁇ ⁇ n-1 and , D 2 to d n-1 can also be determined.
  • a laminated pressure-sensitive adhesive sheet having a desired relative dielectric constant can be formed by adjusting the relative dielectric constant and thickness of the pressure-sensitive adhesive layer present inside the laminated pressure-sensitive adhesive sheet.
  • a pressure-sensitive adhesive having appropriate pressure-sensitive adhesive properties according to the adherend as an adhesive layer in contact with the adherend (hereinafter referred to as the outermost pressure-sensitive adhesive layer) and a thickness are set in advance.
  • the thickness of layers other than the outermost pressure-sensitive adhesive layer for obtaining the desired dielectric constant of the entire laminated pressure-sensitive adhesive sheet can be obtained by using the above formula (1). it can. Thereby, the laminated adhesive sheet which can achieve a desired adhesive physical property and a dielectric constant simultaneously is obtained.
  • each of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer of the laminated pressure-sensitive adhesive sheet of the present invention is preferably 10 ⁇ m or more. If it is more than the said lower limit, the relative dielectric constant of the whole lamination adhesive sheet can be adjusted with sufficient accuracy.
  • the total thickness of the laminated pressure-sensitive adhesive sheet is preferably 20 to 1000 ⁇ m, particularly the thickness of the outermost pressure-sensitive adhesive layer is preferably 10 to 100 ⁇ m, and more preferably 25 to 50 ⁇ m.
  • the present invention is a method for adjusting the relative dielectric constant of a laminated adhesive sheet having at least two pressure-sensitive adhesive layers, and also relates to a relative dielectric constant adjusting method using the above formula (1).
  • laminated adhesive sheets having various relative dielectric constants can be easily formed. Thereby, the relative dielectric constant of the entire laminated adhesive sheet can be controlled with high accuracy.
  • the present invention is a method for producing a laminated pressure-sensitive adhesive sheet having at least two pressure-sensitive adhesive layers, and a step of adjusting the relative dielectric constant of the laminated pressure-sensitive adhesive sheet by the relative dielectric constant adjusting method using the above formula (1). It is also related with the manufacturing method of the lamination adhesive sheet containing this. By using such a manufacturing method, the production efficiency of a laminated adhesive sheet can also be improved.
  • Adhesive As the adhesive main agent that forms the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, it is preferable to use a transparent material so as not to lower the visibility of a display device or the like.
  • known pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and polyurethane-based pressure-sensitive adhesives can be used.
  • an acrylic pressure-sensitive adhesive is preferably used, and an acrylic pressure-sensitive adhesive containing an acrylic polymer as a base polymer is preferable.
  • the acrylic polymer contains a non-crosslinkable (meth) acrylic acid ester unit and an acrylic monomer unit having a crosslinkable functional group.
  • the “monomer unit” is a repeating unit constituting the polymer.
  • An “acrylic monomer” is a compound having a (meth) acryloyl group.
  • (Meth) acryloyl group” means an acryloyl group or a methacryloyl group.
  • the non-crosslinkable acrylic monomer is an acrylic monomer having no crosslinkable group
  • the crosslinkable monomer is a monomer having a crosslinkable group.
  • the crosslinkable monomer may be an acrylic monomer or a non-acrylic monomer as long as it is polymerizable with the non-crosslinkable acrylic monomer, and is preferably an acrylic monomer.
  • the crosslinkable group include a carboxy group, a hydroxy group, an amino group, an epoxy group, and a glycidyl group.
  • non-crosslinkable acrylic monomer unit examples include a (meth) acrylic acid ester unit in which a hydrogen atom of a carboxy group of (meth) acrylic acid is substituted with a hydrocarbon group.
  • each adhesive layer contains a (meth) acrylic acid ester unit.
  • the number of carbon atoms of the hydrocarbon group in the (meth) acrylate unit is preferably 1-18, and more preferably 1-8.
  • the hydrocarbon group may have a substituent, and the substituent is not particularly limited as long as it does not contain a crosslinkable group, and examples thereof include alkoxy groups such as a methoxy group and an ethoxy group.
  • (meth) acrylic acid ester examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, ( Isobutyl acrylate, t-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate , Isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isobornyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, (meth) N-und
  • n-butyl acrylate, 2-ethylhexyl acrylate, and methyl acrylate are preferably used from the viewpoint of adhesiveness. These may be used individually by 1 type and may use 2 or more types together.
  • (meth) acrylic acid means containing both “acrylic acid” and “methacrylic acid”.
  • a carboxy group-containing copolymerizable monomer unit As the crosslinkable monomer unit, a carboxy group-containing copolymerizable monomer unit, a hydroxy group-containing copolymerizable monomer unit, an amino group-containing copolymerizable monomer unit, a glycidyl group-containing copolymerizable monomer Examples include body units.
  • the carboxy group-containing copolymerizable monomer include ⁇ , ⁇ -unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, and grataconic acid, and anhydrides thereof. Such as things.
  • Examples of the hydroxy group-containing copolymerizable monomer include (meth) acrylic acid such as 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate. (Meth) acrylic acid lactones such as hydroxyalkyl, (meth) acrylic acid (meth) acrylic acid mono (diethylene glycol) [(mono, di or poly) alkylene glycol], (meth) acrylic acid monocaprolactone and the like.
  • Examples of the amino group-containing copolymerizable monomer include (meth) acrylamide and allylamide.
  • Examples of the glycidyl group-containing copolymerizable monomer include glycidyl (meth) acrylate.
  • glycidyl (meth) acrylate examples include glycidyl (meth) acrylate.
  • a hydroxy group-containing copolymerizable monomer Is preferred, hydroxyalkyl (meth) acrylate is more preferred, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate is particularly preferred.
  • the acidity becomes strong, so when a corrosive film such as a tin-doped indium oxide film or a metal film is in contact with these, May corrode the film.
  • the content is preferably less than 0.5% by mass, More preferably it is not contained at all.
  • the content rate of the carboxy group containing copolymerizable monomer unit in this acrylic polymer is less than 1.0 mass% from the point of corrosion prevention as the whole lamination adhesive sheet.
  • the acrylic polymer may have other monomer units other than the non-crosslinkable acrylic monomer unit and the crosslinkable monomer unit.
  • examples of other monomers include (meth) acrylonitrile, vinyl acetate, styrene, vinyl chloride, vinyl pyrrolidone, vinyl pyridine and the like.
  • the content of other monomer units in the acrylic polymer is preferably 0.1 to 20% by mass, and more preferably 0.5 to 10% by mass. If the content of other monomer units is not less than the above lower limit, the physical properties can be easily adjusted, and if it is not more than the above upper limit, yellowing due to deterioration with time can be prevented.
  • the relative dielectric constant of each pressure-sensitive adhesive layer can be set to a desired value by appropriately selecting the type of resin used for the pressure-sensitive adhesive.
  • (meth) acrylic acid ester units having a relatively high polarity such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, (meth) acrylic It is preferable to use isopropyl acid, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, or the like.
  • methyl (meth) acrylate and n-butyl (meth) acrylate are preferred from the viewpoints of transparency and adhesion between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer.
  • the crosslinkable monomer unit similarly, a relatively high carboxyl group-containing copolymerizable monomer unit, hydroxy group-containing copolymerizable monomer unit, amino group-containing copolymerizable monomer unit
  • the carboxy group-containing copolymerizable monomer for example, ⁇ , ⁇ -unsaturation such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, grataconic acid, etc.
  • Examples of the carboxylic acid, anhydride thereof, and hydroxy group-containing copolymerizable monomer include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate.
  • (Meth) acrylic acid ((mono, di or poly) a) such as (meth) acrylic acid hydroxyalkyl, (meth) acrylic acid mono (diethylene glycol)
  • Examples of (meth) acrylic acid lactone and amino group-containing copolymerizable monomers such as (alkylene glycol] and (meth) acrylic acid monocaprolactone include (meth) acrylamide and allylamide.
  • the proportion of polar groups in the whole molecule is high, so 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate are preferred.
  • a material having a low polarity may be used.
  • (meth)) 2-ethylhexyl (meth) acrylate, n-octy
  • a crosslinking agent may be used for each pressure-sensitive adhesive layer.
  • the crosslinking agent include isocyanate compounds, epoxy compounds, oxazoline compounds, aziridine compounds, metal chelate compounds, butylated melamine compounds, and the like.
  • an isocyanate compound and an epoxy compound are preferable because the acrylic polymer can be easily crosslinked.
  • an isocyanate compound when the acrylic polymer contains only a hydroxy group-containing copolymerizable monomer unit as a crosslinkable monomer unit, it is preferable to use an isocyanate compound because of the reactivity of the hydroxy group.
  • Examples of the isocyanate compound include tolylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
  • Examples of the epoxy compound include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, glycerin diglycidyl ether, neopentyl glycol diglycidyl ether, and 1,6-hexanediol diester.
  • Glycidyl ether tetraglycidyl xylenediamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, trimethylolpropane polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, etc. Can be mentioned. It is preferable that the content of the crosslinking agent is appropriately selected according to the desired pressure-sensitive adhesive properties.
  • each pressure-sensitive adhesive layer may include an antioxidant, a metal corrosion inhibitor, a tackifier, a silane coupling agent, an ultraviolet absorber, a light stabilizer such as a hindered amine compound, a filler, and the like as necessary. May be included.
  • the antioxidant include phenolic antioxidants, amine-based antioxidants, lactone-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, and the like. These antioxidants may be used alone or in combination of two or more.
  • a benzotriazole-based resin is preferable because of the compatibility and high effect of the pressure-sensitive adhesive.
  • Examples of the tackifier include rosin resins, terpene resins, terpene phenol resins, coumarone indene resins, styrene resins, xylene resins, phenol resins, petroleum resins, and the like.
  • Examples of the silane coupling agent include mercaptoalkoxysilane compounds (for example, mercapto group-substituted alkoxy oligomers).
  • Examples of the ultraviolet absorber include benzotriazole compounds and benzophenone compounds.
  • the laminated pressure-sensitive adhesive sheet of the present invention may further have a resin layer in addition to the above-described first pressure-sensitive adhesive layer, second pressure-sensitive adhesive layer, and third pressure-sensitive adhesive layer.
  • the resin layer may be an adhesive layer or a non-adhesive resin layer. Further, it may be a single layer or a plurality of layers.
  • the resin used is preferably one that does not affect the optical properties, such as polycarbonate, polyethylene terephthalate, polymethyl methacrylate, polyethylene naphthalate, cycloolefin polymer, triacetyl cellulose. , Polyimide, cellulose acylate and the like.
  • the pressure-sensitive adhesive agent having a transparency that does not deteriorate the visibility of the display device is preferable, as in the case of the pressure-sensitive adhesive agent used in each pressure-sensitive adhesive layer.
  • known adhesives such as acrylic adhesives, silicone adhesives, polyester adhesives, rubber adhesives, polyurethane adhesives and the like can be used.
  • An acrylic pressure-sensitive adhesive containing, as a base polymer, an acrylic polymer containing (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms as a main monomer component is preferable.
  • the laminated pressure-sensitive adhesive sheet 10 of the present invention has a first pressure-sensitive adhesive layer 1, a second pressure-sensitive adhesive layer 2, and a resin layer 5.
  • the resin layer 5 may be provided between the first pressure-sensitive adhesive layer 1 and the second pressure-sensitive adhesive layer 2 as shown in FIG.
  • the laminated pressure-sensitive adhesive sheet can function as a double-sided pressure-sensitive adhesive sheet. Further, as shown in FIG.
  • the first pressure-sensitive adhesive layer 1 is laminated on the resin layer 5, and the second resin layer is disposed on the opposite side of the resin layer 5 through the first pressure-sensitive adhesive layer 1. 2 may be provided.
  • the second pressure-sensitive adhesive layer 2 adheres to an adherend such as an optical member, the second pressure-sensitive adhesive layer 2 preferably contains a resin excellent in adhesiveness to the adherend.
  • the relative dielectric constant of the resin layer at a frequency of 1 MHz is preferably 2 to 10.
  • the relative dielectric constant of the resin layer is preferably adjusted by appropriately selecting the type of resin used.
  • the thickness of the resin layer is preferably 10 to 500 ⁇ m, more preferably 25 to 250 ⁇ m. If the thickness of the resin layer is equal to or greater than the above lower limit, the relative dielectric constant of the entire laminated adhesive sheet can be easily controlled, and if the thickness of the resin layer is equal to or less than the above upper limit, the laminated adhesive sheet is easily manufactured. it can.
  • the laminated pressure-sensitive adhesive sheet of the present invention is formed, for example, by coating the first pressure-sensitive adhesive composition and the second pressure-sensitive adhesive composition on a release sheet to form a coating film, and heating the coating film to obtain a cured product. Can be obtained.
  • a release sheet a peelable laminate sheet having a release sheet substrate and a release agent layer provided on one side of the release sheet substrate, or a polyolefin film such as a polyethylene film or a polypropylene film as a low polarity substrate Is mentioned.
  • the release sheet substrate in the peelable laminate sheet is used as the release sheet substrate in the peelable laminate sheet.
  • a general-purpose addition type or condensation type silicone release agent or a long-chain alkyl group-containing compound is used as the release agent constituting the release agent layer.
  • silicone release agents include BY24-4527 and SD-7220 manufactured by Toray Dow Corning Silicone, KS-3600, KS-774, and X62-2600 manufactured by Shin-Etsu Chemical Co., Ltd. Is mentioned.
  • the silicone release agent may contain a silicone resin which is an organosilicon compound having a SiO 2 unit and a (CH 3 ) 3 SiO 1/2 unit or CH 2 ⁇ CH (CH 3 ) SiO 1/2 unit. preferable.
  • Specific examples of the silicone resin include BY24-843, SD-7292, SHR-1404 manufactured by Toray Dow Corning Silicone, KS-3800, X92-183 manufactured by Shin-Etsu Chemical Co., Ltd., and the like.
  • the first adhesive layer side release sheet and the second adhesive layer side release sheet have different peelability. That is, when the peelability from one side and the peelability from the other are different, it becomes easy to peel only the release sheet having the higher peelability first. In that case, what is necessary is just to adjust the peelability of a 1st adhesive layer side peeling sheet and a 2nd adhesive layer side peeling sheet according to the bonding method and the bonding order.
  • the application of the pressure-sensitive adhesive composition for forming each pressure-sensitive adhesive layer can be carried out using a known coating apparatus.
  • the pressure-sensitive adhesive composition may be applied to each pressure-sensitive adhesive layer, or two or more pressure-sensitive adhesive layers may be formed by simultaneous multilayer coating of the pressure-sensitive adhesive composition.
  • the coating apparatus include a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a micro gravure coater, a rod blade coater, a lip coater, a die coater, and a curtain coater.
  • the coating liquid contains a solvent.
  • the solvent examples include methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, toluene, n-hexane, n-butyl alcohol, methyl isobutyl ketone, methyl butyl ketone, ethyl butyl ketone, cyclohexanone, ethyl acetate, butyl acetate, propylene glycol monomethyl.
  • Ether acetate, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, N-methyl-2-pyrrolidone and the like are used. These may be used alone or in combination of two or more.
  • the coating film can be heated using a known heating device such as a heating furnace or an infrared lamp.
  • the resin layer can also be formed using the above coating apparatus.
  • the resin layer when it is a non-adhesive resin layer, it can be molded by a known method and is not particularly limited, but a biaxial stretching method, a melt extrusion method, or the like is preferable.
  • a laminated body in this invention, can be produced by sticking a laminated adhesive sheet to at least one optical member.
  • the laminated adhesive sheet is a double-sided adhesive sheet, a pair of optical members can be bonded to both sides of the laminated adhesive sheet.
  • the optical member constituting the laminate is each constituent member in an optical product such as a touch panel or an image display device.
  • a constituent member of the touch panel for example, an ITO film in which an ITO film is provided on a transparent resin film, an ITO glass in which an ITO film is provided on the surface of a glass plate, a transparent conductive film in which a transparent polymer film is coated with a conductive polymer, Examples thereof include a hard coat film and an anti-fingerprint film.
  • the constituent member of the image display device include an antireflection film, an alignment film, a polarizing film, a retardation film, and a brightness enhancement film used in a liquid crystal display device.
  • Examples of materials used for these members include glass, polycarbonate, polyethylene terephthalate, polymethyl methacrylate, polyethylene naphthalate, cycloolefin polymer, triacetyl cellulose, polyimide, and cellulose acylate.
  • bonding between ITO films inside the touch panel, bonding between ITO film and ITO glass, touch panel ITO film and liquid crystal panel Examples include bonding, bonding between a cover glass and an ITO film, and bonding between a cover glass and a decorative film.
  • pressure-sensitive adhesive composition (A) contained in the first pressure-sensitive adhesive layer 80 parts by mass of 2-ethylhexyl acrylate as a non-crosslinkable acrylate unit, 17 parts by mass of isobornyl acrylate, and 3 parts by mass of 4-hydroxybutyl acrylate as an acrylic monomer unit having a crosslinkable functional group are used in a known solvent weight.
  • a polymerization reaction was performed by a legal method to obtain an acrylate copolymer solution.
  • a pressure-sensitive adhesive solution containing this acrylic acid ester copolymer solution as a pressure-sensitive adhesive was used as a pressure-sensitive adhesive composition (A).
  • a release sheet As a release sheet, a release film (38 ⁇ m RL-07 (L), manufactured by Oji F-Tex Co., Ltd.) provided with a release layer on a PET film was prepared, and the above-mentioned pressure-sensitive adhesive composition ( The solution of A) was applied with a knife coater, heated at 100 ° C. for 3 minutes to form an adhesive layer having a thickness of 100 ⁇ m, and compared with JIS-C-2138 using a dielectric constant measurement system (Toyo Technica Model 1260). When the dielectric constant was measured and detected, the relative dielectric constant ⁇ 1 at a frequency of 1 MHz was 2.6.
  • a dielectric constant measurement system Toyo Technica Model 1260
  • a release sheet As a release sheet, a release film (38 ⁇ m RL-07 (L), manufactured by Oji F-Tex Co., Ltd.) provided with a release layer on a PET film was prepared, and the above-mentioned pressure-sensitive adhesive composition ( The solution of B) was applied with a knife coater, heated at 100 ° C. for 3 minutes to form an adhesive layer having a thickness of 100 ⁇ m, and the relative dielectric constant was measured.
  • the relative dielectric constant ⁇ 2 at a frequency of 1 MHz was 5.4. It was.
  • a release sheet As a release sheet, a release film (38 ⁇ m RL-07 (L), manufactured by Oji F-Tex Co., Ltd.) provided with a release layer on a PET film was prepared, and the above-mentioned pressure-sensitive adhesive composition ( The syrup of C) was coated with a knife coater and irradiated with an integrated light amount of 1000 mJ / cm 2 while cooling with a UV irradiator under a nitrogen atmosphere to form an adhesive layer having a thickness of 100 ⁇ m.
  • a release film 38 ⁇ m RL-07 (L), manufactured by Oji F-Tex Co., Ltd.
  • the syrup of D was applied with a knife coater and irradiated with an integrated light amount of 1000 mJ / cm 2 while cooling with a UV irradiator under a nitrogen atmosphere to form an adhesive layer having a thickness of 100 ⁇ m.
  • the relative permittivity of this pressure-sensitive adhesive layer was measured based on JIS-C-2138 using a permittivity measurement system (Toyo Technica Model 1260), the relative permittivity ⁇ 1 at a frequency of 1 MHz was 5.8. It was.
  • Example 1 Production of laminated adhesive sheet
  • a release film (Oji F-Tex Co., Ltd., 38 ⁇ m RL-07 (L)) provided with a release agent layer on a PET film was prepared, and the release agent layer of the first release sheet was The solution of the pressure-sensitive adhesive composition (A) was applied with a knife coater and heated at 100 ° C. for 3 minutes to form a first pressure-sensitive adhesive layer having a thickness of 50 ⁇ m.
  • a release film 38 ⁇ m RL-07 (L) manufactured by Oji F-Tex Co., Ltd.
  • a release agent layer on a PET film was prepared, and the release agent layer of the second release sheet was
  • the solution of the pressure-sensitive adhesive composition (B) was applied with a knife coater and heated at 100 ° C. for 3 minutes to form a second pressure-sensitive adhesive layer having a thickness of 50 ⁇ m.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer were stacked and pressed together so that they were in contact with each other.
  • the laminated adhesive sheet with a peeling sheet whose thickness of an adhesive layer is 100 micrometers was obtained.
  • Example 4 Production of laminated adhesive sheet using UV curable adhesive composition
  • adhesive compositions (C) and (D) In order to produce a laminated adhesive sheet having a relative dielectric constant of 3.5 using adhesive compositions (C) and (D).
  • the ratio of the thicknesses of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer was calculated using the formula (1).
  • An adhesive layer and a second adhesive layer were formed.
  • a release film (Oji F-Tex Co., Ltd., 38 ⁇ m RL-07 (L)) provided with a release agent layer on a PET film was prepared, and the release agent layer of the first release sheet was A syrup of the pressure-sensitive adhesive composition (C) was applied with a knife coater, and irradiated with an integrated light amount of 1000 mJ / cm 2 while being cooled with a UV irradiator in a nitrogen atmosphere to form a pressure-sensitive adhesive layer having a thickness of 45 ⁇ m.
  • a release film 38 ⁇ m RL-07 (L) manufactured by Oji F-Tex Co., Ltd.
  • a release agent layer on a PET film was prepared, and the release agent layer of the second release sheet was
  • the solution of the pressure-sensitive adhesive composition (D) was applied with a knife coater, and irradiated with an integrated light amount of 1000 mJ / cm 2 while being cooled with a UV irradiator in a nitrogen atmosphere to form a pressure-sensitive adhesive layer having a thickness of 55 ⁇ m.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer were stacked and pressed together so that they were in contact with each other.
  • the laminated adhesive sheet with a peeling sheet whose thickness of an adhesive layer is 100 micrometers was obtained.
  • a laminated pressure-sensitive adhesive sheet with a release sheet having a pressure-sensitive adhesive layer thickness of 100 ⁇ m was obtained in the same manner as in Example 4 except that the thickness of the pressure-sensitive adhesive layer was changed to 80 ⁇ m.
  • Example 6 In order to produce a laminated pressure-sensitive adhesive sheet having a relative dielectric constant of 3.0 using the pressure-sensitive adhesive compositions (C) and (D), the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are expressed using the formula (1).
  • ⁇ represents the relative dielectric constant of the entire laminated adhesive sheet
  • d represents the thickness of the entire laminated adhesive sheet.
  • epsilon n represents the dielectric constant of the adhesive layer
  • d n represents the thickness of each adhesive layer. Note that n represents the number of pressure-sensitive adhesive layers.
  • pressure-sensitive adhesive composition (1) 40 parts by mass of methyl acrylate and 40 parts by mass of butyl acrylate as non-crosslinkable acrylic ester units, and 20 parts by mass of 4-hydroxybutyl acrylate as an acrylic monomer unit having a crosslinkable functional group are obtained by a known solvent polymerization method. A polymerization reaction was performed to obtain an acrylate copolymer solution. A pressure-sensitive adhesive solution containing this acrylic acid ester copolymer solution as a pressure-sensitive adhesive was designated as pressure-sensitive adhesive composition (1).
  • pressure-sensitive adhesive composition (2) As a non-crosslinkable acrylic ester unit, 60 parts by mass of 2-ethylhexyl acrylate, 38 parts by mass of isobornyl acrylate, and 2 parts by mass of 4-hydroxybutyl acrylate as an acrylic monomer unit having a crosslinkable functional group are used. A polymerization reaction was performed by a legal method to obtain an acrylate copolymer solution. A pressure-sensitive adhesive solution containing the acrylic acid ester copolymer solution as a pressure-sensitive adhesive was designated as pressure-sensitive adhesive composition (2).
  • Example 7 Production of Laminated Adhesive Sheet 7 Having Three Adhesive Layers
  • Second Adhesive Layer As a first release sheet, a release film provided with a release agent layer on a PET film [Oji Ftex Co., Ltd., 38 ⁇ m RL-07 (L)] was prepared, and the adhesive (2) solution was applied to the release agent layer of the first release sheet with a knife coater at 100 ° C. for 3 minutes. Heated to form a second pressure-sensitive adhesive layer. The relative dielectric constant ⁇ r at a frequency of 100 Hz of the formed second pressure-sensitive adhesive layer was 4.5.
  • the formula (1) As a result of obtaining the optimum thickness of the second pressure-sensitive adhesive layer by using, the second pressure-sensitive adhesive (2) was applied so as to have a thickness of 51 ⁇ m.
  • first pressure-sensitive adhesive layer comprising a release agent layer having a lower release property than the first release sheet on the PET film as the second release sheet [manufactured by Oji F-Tex Co., Ltd., 38 ⁇ m RL -07 (2)], and a solution of the above-mentioned adhesive (1) was applied to the release agent layer of the second release sheet with a knife coater so as to have a thickness of 25 ⁇ m, and 100 ° C. for 3 minutes. Heated to form a first pressure-sensitive adhesive layer.
  • the relative dielectric constant ⁇ r at a frequency of 100 Hz of the formed first pressure-sensitive adhesive layer was 7.1.
  • third pressure-sensitive adhesive layer As a third release sheet, the same release film as the first release film [manufactured by Oji F-Tex Co., Ltd., 38 ⁇ m RL-07 (L)] was prepared. A solution of the pressure-sensitive adhesive (1) was applied to the release agent layer of the release sheet with a knife coater so as to have a thickness of 25 ⁇ m, and heated at 100 ° C. for 3 minutes to form a third pressure-sensitive adhesive layer. The relative dielectric constant ⁇ r at a frequency of 100 Hz of the formed third pressure-sensitive adhesive layer was 7.1.
  • the overall relative dielectric constant of the laminated pressure-sensitive adhesive sheet 7 is substantially close to the estimated value. Actual measurement values could be obtained. That is, it can be said that a laminated adhesive sheet having a desired relative dielectric constant was obtained.
  • Example 8 Production of laminated adhesive sheet 8 Adhesive (1) for the first adhesive layer, adhesive (2) for the second adhesive layer, and adhesive (3) for the third adhesive layer.
  • the laminated adhesive sheet 8 was produced by the same method as Example 7.
  • the thickness and relative dielectric constant of the first adhesive layer and the thickness and relative dielectric constant of the third adhesive layer are expressed by the formula (1).
  • the pressure-sensitive adhesive (2) was applied so as to have a thickness of 100 ⁇ m.
  • Example 9 Production of Laminated Adhesive Sheet 9
  • a laminated adhesive sheet 9 was produced in the same manner as in Example 8 except that it was used.
  • the pressure-sensitive adhesive (1) was applied so as to have a thickness of 100 ⁇ m.
  • Table 4 shows the thickness and relative dielectric constant of each layer of the laminated adhesive sheets 8 and 9.
  • the relative dielectric constant of the entire laminated adhesive sheet can be freely adjusted by controlling the relative dielectric constant and thickness of the adhesive layer even when the relative dielectric constants of all the adhesive layers are different. It was possible.
  • the laminated pressure-sensitive adhesive sheet of the present invention is useful for bonding optical members, for example, bonding of ITO films in a touch panel sensor, or bonding of a touch panel module and a liquid crystal module.

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