WO2014046167A1 - Feuille adhésive double face pour un élément électronique - Google Patents

Feuille adhésive double face pour un élément électronique Download PDF

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Publication number
WO2014046167A1
WO2014046167A1 PCT/JP2013/075269 JP2013075269W WO2014046167A1 WO 2014046167 A1 WO2014046167 A1 WO 2014046167A1 JP 2013075269 W JP2013075269 W JP 2013075269W WO 2014046167 A1 WO2014046167 A1 WO 2014046167A1
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Prior art keywords
sensitive adhesive
double
pressure
adhesive sheet
adhesive layer
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PCT/JP2013/075269
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English (en)
Japanese (ja)
Inventor
那須　健司
和明 森田
晃司 土渕
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リンテック株式会社
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Priority to CN201380048908.3A priority Critical patent/CN104640948B/zh
Publication of WO2014046167A1 publication Critical patent/WO2014046167A1/fr

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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
    • C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
    • C08G18/6225—Polymers of esters of acrylic or methacrylic acid
    • C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
    • C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
    • 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
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • 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
    • 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 double-sided pressure-sensitive adhesive sheet, and more particularly, to a double-sided pressure-sensitive adhesive sheet that has a reduced possibility of releasing a gas component that may adversely affect the operation of a component incorporated in a device such as a hard disk and has excellent adhesiveness.
  • sheet includes the concept of tape and the concept of film.
  • component incorporated in the device includes a component that is not directly related to the operation of the device, such as a display label.
  • a gas component released from a double-sided PSA sheet attached to a component incorporated in a device during the manufacturing process, storage and / or use is also referred to as “outgas”.
  • HDD hard disk drives
  • relays various switches, connectors, and motors
  • a double-sided pressure-sensitive adhesive sheet in which both main surfaces are composed of the surface of the pressure-sensitive adhesive layer is used for the purpose of temporarily fixing at the time of assembly, fixing of the component, displaying the content of the component, and the like.
  • the device usage environment for example, HDD is in use
  • a substance also referred to as “low molecular weight component” in this specification
  • a low molecular weight component may be generated in the adhesive layer in the course of composition change of the adhesive over time. When such a low molecular weight component becomes outgas and diffuses into the device, the low molecular weight component may adhere to the surface of a component incorporated in the device.
  • Patent Document 1 discloses a pressure-sensitive adhesive part provided with a pressure-sensitive adhesive layer on both sides of a plastic film substrate having a thickness of 20 ⁇ m or less, and both sides of the pressure-sensitive adhesive part.
  • a double-sided pressure-sensitive adhesive sheet composed of a non-silicone release liner provided on the surface of the adhesive, wherein the pressure-sensitive adhesive portion has a thickness of 60 ⁇ m or less and an outgas amount of 1 ⁇ g / cm 2 when heated at 120 ° C. for 10 minutes.
  • the following double-sided pressure-sensitive adhesive sheet for fixing HDD components is disclosed.
  • FIG. 1 is a partial cross-sectional view conceptually showing a housing of an HDD to which an FPC is attached via a double-sided adhesive sheet for explaining the “floating” phenomenon.
  • FIG. 1A when the “floating” phenomenon occurs when the laminated body 4 of the FPC 2 and the double-sided pressure-sensitive adhesive sheet 3 is attached so as to include the step portion in the housing 1 of the HDD, In the step portion, as shown in FIG. 1B, separation occurs at the interface between the double-sided pressure-sensitive adhesive sheet 3 and the HDD housing 1, and the laminate 4 is lifted from the housing at this portion.
  • Such a phenomenon that the double-sided pressure-sensitive adhesive sheet attached to the adherend having a stepped portion partially peels off the adherend so as to include the stepped portion is referred to as “floating” (partial peeling) in the present specification. .
  • floating partial peeling
  • increasing the adhesiveness of the double-sided pressure-sensitive adhesive sheet 3 increases the possibility of outgas generation from the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive sheet 3, and is not a preferable solution.
  • the present invention is less likely to cause peeling even when the surface of the hard-to-lift portion, such as a stepped portion of the HDD housing, is generated, and the possibility of generating outgas is reduced. It aims at providing the coating material for forming the double-sided adhesive sheet and the adhesive layer with which a double-sided adhesive sheet is provided.
  • the present inventors have studied the above-mentioned factors that cause the float.
  • the restoring force of the FPC in addition to the restoring force of the FPC when the FPC is bent along the surface of the stepped portion of the casing, It was found that the restoring force of the pressure-sensitive adhesive layer in response to the bending of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet along the surface of the stepped part is one of the factors that cause the floating.
  • the present invention based on such knowledge is firstly a double-sided pressure-sensitive adhesive sheet comprising at least one pressure-sensitive adhesive layer having a residual stress ratio of less than 40%, wherein the pressure-sensitive adhesive layer comprises a crosslinking agent and a crosslinkable polymer.
  • the double-sided pressure-sensitive adhesive sheet (Invention 1) is provided, wherein the cross-linking agent contains a tolylene diisocyanate-based cross-linking agent.
  • the stress residual value of the pressure-sensitive adhesive layer is less than 40%, the restoring force of the sheet when the double-sided pressure-sensitive adhesive sheet according to the invention is deformed so as to be bent can be reduced. Even if the double-sided pressure-sensitive adhesive sheet having such characteristics is affixed to a surface having a high degree of bending, such as the surface of the stepped portion of the HDD housing, the pressure-sensitive adhesive layer is difficult to peel off. Moreover, it becomes easy to control the stress residual value of an adhesive layer in said range because the crosslinking agent concerning the adhesive layer of a double-sided adhesive sheet contains a tolylene diisocyanate type crosslinking agent.
  • the gel fraction of the pressure-sensitive adhesive layer is preferably 10% or more and 70% or less (Invention 2).
  • the amount of the crosslinking agent containing the tolylene diisocyanate-based crosslinking agent so that the gel fraction of the pressure-sensitive adhesive layer is in the above range, the residual stress ratio of the obtained pressure-sensitive adhesive layer is in the above range. It becomes easier to control.
  • the stress residual ratio is less than 40% for all the adhesive layers provided in the double-sided PSA sheet (Invention 3). In this case, even if it is attached to a surface with a high degree of bending, such as the surface of the stepped portion of the HDD housing, the adhesive layer is particularly difficult to peel off.
  • the crosslinkable polymer contains an acrylic polymer having no carboxyl group (Invention 4).
  • the possibility that outgas is generated from the adhesive layer is further reduced, it is more stable that the malfunction of the device may occur even when the double-sided adhesive sheet is stuck inside the HDD housing.
  • the acrylic polymer having no carboxyl group is an ethylenic polymer having a structural unit based on an alkyl (meth) acrylate having 4 or less carbon atoms in the alkyl group and the reactive functional group. It is preferable that the structural unit based on a saturated compound is included (invention 5). By including a structural unit based on such an ethylenically unsaturated compound, it becomes easier to improve both the adhesive properties of the pressure-sensitive adhesive layer and to reduce the outgas amount.
  • the acrylic polymer having no carboxyl group preferably further includes a structural unit based on a morpholine compound having an ethylenically unsaturated group (Invention 6).
  • a structural unit based on such a morpholine-based compound it becomes easier to increase both the density of cross-linking bonds existing in the pressure-sensitive adhesive layer and the amount of outgas.
  • the double-sided pressure-sensitive adhesive sheet comprises a core material having two main surfaces, and the pressure-sensitive adhesive layer is laminated on each main surface (Invention 7).
  • the pressure-sensitive adhesive layer is not easily peeled off even when the double-sided pressure-sensitive adhesive sheet is attached to a surface having a high degree of bending, and the handleability of the double-sided pressure-sensitive adhesive sheet is improved.
  • the thickness of the core material is preferably 2 ⁇ m or more and 15 ⁇ m or less (Invention 8).
  • the function of the double-sided pressure-sensitive adhesive sheet according to the above invention can be more stably exhibited while enjoying the benefits of providing the core material.
  • this invention is a coating material for forming the adhesive layer with which the double-sided adhesive sheet which concerns on the said invention (invention 1-8) is provided, Comprising: A crosslinkable polymer and a tolylene diisocyanate type crosslinking agent And a coating material having fluidity (Invention 9).
  • the double-sided pressure-sensitive adhesive sheet according to the present invention has a low stress residual ratio of the pressure-sensitive adhesive layer, the restoring force when deformed to bend the sheet is low. For this reason, when the double-sided pressure-sensitive adhesive sheet according to the present invention is applied to a surface having a high degree of bending (also referred to as “highly-bent surface” in the present specification), such as the surface of the stepped portion of the housing of the HDD. The force acting on the pressure-sensitive adhesive layer on the side facing the highly bent surface of the sheet to peel the pressure-sensitive adhesive layer from the adhesive surface of the pressure-sensitive adhesive layer is reduced.
  • the double-sided pressure-sensitive adhesive sheet according to the present invention it is possible to reduce both the possibility of outgassing and the possibility of floating even when the adherend surface has a highly bent surface.
  • Double-sided pressure-sensitive adhesive sheet The other structure of the double-sided pressure-sensitive adhesive sheet according to one embodiment of the present invention is not particularly limited as long as both main surfaces thereof are constituted by a surface of a specific pressure-sensitive adhesive layer. Both main surfaces of the single pressure-sensitive adhesive layer may constitute both main surfaces of the double-sided pressure-sensitive adhesive sheet, or the double-sided pressure-sensitive adhesive sheet is composed of a laminate of a plurality of pressure-sensitive adhesive layers, The main surface may be comprised from the surface of the same kind or different kind of adhesive layer.
  • the double-sided pressure-sensitive adhesive sheet may include a member other than the pressure-sensitive adhesive layer (a core material described later as a specific example), and a plurality of pressure-sensitive adhesive layers may sandwich a member such as the core material.
  • the two main surfaces of the double-sided pressure-sensitive adhesive sheet may be composed of surfaces of the same type of pressure-sensitive adhesive layer, or may be composed of surfaces of different types of pressure-sensitive adhesive layers.
  • Pressure-sensitive adhesive layer (1-1) Stress relaxation rate At least one of the pressure-sensitive adhesive layers provided in the double-sided pressure-sensitive adhesive sheet according to this embodiment has a stress residual rate defined below of less than 40%. About all the adhesive layers with which the double-sided adhesive sheet which concerns on this embodiment is provided, it is preferable that a stress residual rate is less than 40%.
  • the “stress residual ratio” in this specification is a value obtained as follows. That is, the pressure-sensitive adhesive to be measured is formed in a pressure-sensitive adhesive layer having a thickness of 50 ⁇ m, cut into 50 mm ⁇ 50 mm, and rounded into a cylindrical shape to obtain a sample for tensile test. This cylindrical tensile test sample was pulled at a tensile rate of 200 mm / min and a distance between chucks of 30 mm with a universal tensile tester in an environment of 23 ° C. and 50% relative humidity. The stress A (N) when the 30 mm portion between them is extended by 5% and the stress B (N) after 5 minutes from the extension stop are measured. B / A ⁇ 100 (%) is calculated from these measured stresses A and B, and the value is defined as a residual stress rate (%).
  • the double-sided pressure-sensitive adhesive sheet When a double-sided pressure-sensitive adhesive sheet is applied to a highly bent surface such as a stepped portion of the housing of the HDD, the double-sided pressure-sensitive adhesive sheet also deforms along the highly bent surface, and the adhesive layer near the bent portion has A compressive force or tensile force based on deformation acts.
  • the pressure-sensitive adhesive layer provided in the double-sided pressure-sensitive adhesive sheet according to the present embodiment has a stress residual ratio of less than 40%, the pressure-sensitive adhesive layer in the vicinity of the bending point tends to be restored against deformation during application. It is hard to generate power.
  • the stress residual rate of the PSA layer is preferably 35% or less, more preferably 30% or less, and 25% or less. It is particularly preferred.
  • the lower limit of the residual stress rate is not particularly limited, but when the residual stress rate is excessively low, the density of the crosslinked structure existing in the pressure-sensitive adhesive layer (also referred to as “crosslink density” in this specification) is particularly low. Therefore, there is a concern that it is difficult to control the adhesive properties (tackiness, adhesiveness, removability, etc.). From the viewpoint of reducing the possibility that such a problem occurs, the stress residual rate of the pressure-sensitive adhesive layer is preferably 1% or more, and more preferably 10% or more.
  • the double-sided pressure-sensitive adhesive sheet according to the present embodiment includes a pressure-sensitive adhesive layer having the above-described characteristics relating to the stress residual ratio, and includes a crosslinking agent and a reactive functional group that is a functional group capable of reacting with the crosslinking agent. It includes a crosslinked structure formed by a reaction with a polymer (also referred to as “crosslinkable polymer” in this specification).
  • the crosslinkable polymer according to the pressure-sensitive adhesive layer of this embodiment is an acrylic polymer with a reduced amount of carboxyl groups.
  • the content of the carboxyl group in the crosslinkable polymer is such that the structural unit having a carboxyl group is 1.0 part by mass or less with respect to 100 parts by mass of the total amount of monomers for forming the crosslinkable polymer. It is preferable that it is 0.5 mass part or less.
  • the crosslinkable polymer is preferably an acrylic polymer having no carboxyl group (also referred to as “carboxyl free polymer” in the present specification).
  • the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive sheet of the present embodiment preferably has a low carboxyl group content, and preferably does not substantially contain a component having a carboxyl group.
  • the structural unit having a carboxyl group include acrylic acid, methacrylic acid, and itaconic acid.
  • the structural unit of the crosslinkable polymer is not particularly limited.
  • a compound having a (meth) acryloyl group and a derivative thereof may be composed of only a structural unit based on an acrylic compound which is one or two or more compounds, or a structure based on an acrylic compound
  • the structural unit based on compounds other than a unit and an acryl-type compound may be included.
  • the “(meth) acryloyl group” means both an acryloyl group and a metalloyl group. The same applies to other similar terms.
  • compounds other than said acrylic compound may be comprised from one type of compound, and may be comprised from multiple types of compound.
  • (Meth) acrylic acid ester is mentioned as a preferred example of the acrylic compound.
  • Specific examples of (meth) acrylic acid esters include chain skeletons such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate.
  • (Meth) acrylate having: cyclohexyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) ) (Meth) acrylates having a cyclic skeleton such as acrylate, tetrahydrofurfuryl (meth) acrylate, imide acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, -(Meth) acrylates having a hydroxyl group such as hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate; N-methylaminoethyl ( (Meth) acryl
  • the crosslinkable polymer preferably includes a structural unit based on an alkyl (meth) acrylate having an alkyl group having 4 or less carbon atoms (hereinafter also referred to as “lower alkyl compound”).
  • lower alkyl compounds include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth). Examples thereof include acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate and the like.
  • n-butyl (meth) acrylate and methyl (meth) acrylate are preferable from the viewpoint of facilitating an appropriate balance between increasing the adhesive properties of the pressure-sensitive adhesive layer and reducing the outgas amount.
  • a lower alkyl compound may be used individually by 1 type, and may be used in combination of 2 or more type.
  • Monomers that give structural units based on compounds other than acrylic compounds include ethylene, norbornene and other olefins, vinyl acetate and other carboxylic acid vinyl esters, and styrene and other ethylenic polymers.
  • An aromatic compound having a saturated bond is exemplified.
  • the reactive functional group possessed by the crosslinkable polymer according to the pressure-sensitive adhesive layer of the present embodiment is a functional group capable of reacting with an isocyanate group since the crosslinking agent contains a tolylene diisocyanate compound as described later. preferable.
  • Examples of such functional groups other than the carboxyl group include a hydroxyl group, an amino group, and an amide group.
  • the type of compound that provides the structural unit having a reactive functional group in the crosslinkable polymer there are no particular limitations on the type of compound that provides the structural unit having a reactive functional group in the crosslinkable polymer.
  • the above-mentioned (meth) acrylate having a hydroxyl group or (meth) acrylate having an amino group may be mentioned.
  • the ethylenically unsaturated compound having such a reactive functional group also referred to herein as “reactive compound” include an ethylenically unsaturated compound containing an amide group and an alcohol having a vinyl group. .
  • reactive compounds include acrylamide, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, 5-hexen-1-ol, and 5-hexene-3. -Ol, 4-penten-1-ol and the like.
  • the reactive functional group possessed by the reactive compound is preferably a hydroxyl group that hardly changes color due to heat. Accordingly, the reactive compound is preferably a (meth) acrylate having a hydroxyl group and / or an alcohol having a vinyl group.
  • the content ratio of monomers in the crosslinkable polymer of the structural unit (lower alkyl compound) : Reactive compound) is preferably 90:10 to 99.9: 0.1, more preferably 95: 5 to 99.5: 0.5.
  • the pressure-sensitive adhesive layer including a crosslinked structure based on the obtained crosslinkable polymer can easily have the stress residual ratio within the above-described range.
  • the crosslinkable polymer according to the present embodiment may further include a structural unit based on an ethylenically unsaturated group-containing morpholine compound (hereinafter also referred to as “morpholine compound”). Since the morpholine group has a function of accelerating the reaction of the crosslinking agent described later, the crosslinkable polymer becomes a polymer having a functional group having a crosslinking accelerating function by including a structural unit based on a morpholine compound. . In this case, the crosslink density of the pressure-sensitive adhesive layer can be increased while reducing the possibility of outgassing compared to the case where a low molecular weight crosslinking accelerator described later is contained.
  • morpholine compound ethylenically unsaturated group-containing morpholine compound
  • the morpholine compound examples include N-vinylmorpholine, N-allylmorpholine, N- (meth) acryloylmorpholine, and the like.
  • N- (meth) acryloylmorpholine which is also an acrylic compound, is preferable from the viewpoint of good copolymerizability with compounds related to other structural units.
  • One type of morpholine compound may be used, or a plurality of types may be used.
  • the content of the structural unit based on the morpholine compound in the crosslinkable polymer according to the present embodiment is the lower alkyl compound from the viewpoint of easily preventing outgassing while keeping the stress residual ratio within the above range. It is preferably 2 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the total amount of the content of the lower alkyl compound based on the structural unit based on the reactive compound and the content of the reactive compound based on the reactive compound. More preferably, it is 4 parts by mass or more and 25 parts by mass or less.
  • the crosslinkable polymer according to the present embodiment is based on a compound having an ethylenically unsaturated bond other than the structural unit based on the lower alkyl compound, the structural unit based on the reactive compound, and the structural unit based on the morpholine compound. Units may be included. Specific examples of the monomer that provides such a structural unit include olefins, carboxylic acid vinyl esters, and aromatics having an ethylenically unsaturated bond, as in the case of the other polymerizable compounds described above. Or the compound which has a functional group provided with the crosslinking promotion function like a morpholine type compound like an ethylenically unsaturated group containing imidazole type compound, for example is illustrated.
  • the content rate of the structural unit based on such a compound is not particularly limited, when it is excessively large, there is a concern that it is difficult to control the stress residual rate within the above-described range. Therefore, the content is 10 parts by mass with respect to a total of 100 parts by mass of the content of the lower alkyl compound based on the lower alkyl compound in terms of mass of the lower alkyl compound and the content of the reactive compound based on the reactive compound in terms of mass. Is preferably the upper limit, and more preferably 5 parts by mass.
  • cross-linking agent according to the pressure-sensitive adhesive layer of the present embodiment is one or two or more compounds selected from the group consisting of tolylene diisocyanate (TDI) and derivatives thereof (in the present specification, “tolylene diisocyanate type”). It is also referred to as a “crosslinking agent” and may be abbreviated as “TDI-based crosslinking agent”.
  • the cross-linking agent according to the pressure-sensitive adhesive layer of the present embodiment is preferably composed mainly of a TDI-based cross-linking agent, more preferably composed of a TDI-based cross-linking agent, and particularly preferably substantially composed of TDI.
  • TDI-based cross-linking agents include polyisocyanate compounds, isocyanurates, burette-type compounds obtained by addition reaction with trimethylolpropane, and other known polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols. And the like, and urethane prepolymer type polyisocyanate obtained by addition reaction.
  • the cross-linking agent contains a TDI-based cross-linking agent, the double-sided pressure-sensitive adhesive sheet is folded compared to the case where it contains other polyisocyanate compounds such as xylylene diisocyanate (XDI) or hexamethylene diisocyanate (HMDI). Even if an external force is applied to the pressure-sensitive adhesive layer, stress hardly remains in the pressure-sensitive adhesive layer.
  • XDI xylylene diisocyanate
  • HMDI hexamethylene diisocyanate
  • the pressure-sensitive adhesive layer according to this embodiment preferably has a gel fraction of 10% to 70%, and more preferably 20% to 60%.
  • the amount of the crosslinking agent used so that the gel fraction of the pressure-sensitive adhesive layer falls within this range, the stress residual rate can be easily set within the above-described range.
  • the content of the cross-linking agent in the pressure-sensitive adhesive layer before the reaction for forming a cross-linked structure proceeds is 0.1 part by mass or more and 10 parts by mass with respect to 100 parts by mass of the cross-linkable polymer. By adjusting in the range below mass parts, it becomes easy to make the gel fraction of an adhesive layer into said range.
  • the pressure-sensitive adhesive layer can contain various components as long as the residual stress ratio is in the above-described range.
  • crosslinking accelerators for example, crosslinking accelerators; coloring materials such as dyes and pigments; antioxidants such as anilides and phenols; ultraviolet absorbers such as benzophenones and benzotriazoles; filler components such as talc, titanium dioxide, silica, and starch; Examples include plasticizers; antioxidants; light stabilizers; dispersants; leveling agents.
  • these components are preferably those which do not easily generate outgas.
  • the thickness of the pressure-sensitive adhesive layer provided in the double-sided pressure-sensitive adhesive sheet according to this embodiment is not particularly limited. If it is excessively thin, it is feared that desired adhesive properties cannot be obtained. If it is excessively thick, there is a concern that it is disadvantageous from the viewpoint of workability. Therefore, the thickness of the pressure-sensitive adhesive layer is generally selected in the range of 4 to 30 ⁇ m, preferably in the range of 6 to 25 ⁇ m, as the whole pressure-sensitive adhesive layer.
  • the double-sided pressure-sensitive adhesive sheet according to the present embodiment may include a core material.
  • the double-sided pressure-sensitive adhesive sheet according to this embodiment includes a core material in which a pressure-sensitive adhesive layer is laminated on each main surface.
  • the material constituting the core material according to the present embodiment is not particularly limited as long as it has a basic function to be possessed as a core material, such as higher tensile strength than the material constituting the pressure-sensitive adhesive layer. It is preferable that the organic gas is not easily generated.
  • Specific examples of the material constituting the core material include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate and polybutylene terephthalate; polyimides; resin sheets such as polyamide. You may use what gave metal vapor deposition, such as aluminum, to these resin sheets.
  • papers made of synthetic paper, impregnated paper, and the like, and metal foils such as aluminum foil and copper foil can also be given as specific examples of the material constituting the core material.
  • the surface on the side that should face the pressure-sensitive adhesive layer such as an oxidation method or an uneven method
  • Surface treatment can be performed.
  • the oxidation method include corona discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment and the like, and examples of the unevenness method include sand blast method and solvent treatment method. Is mentioned.
  • These surface treatment methods are appropriately selected according to the type of the core material, but generally, the corona discharge treatment method is preferably used from the viewpoints of effects and operability.
  • primer treatment for providing a primer layer specifically examples include silane coupling treatment
  • the thickness of the core material according to this embodiment is not particularly limited. If it is excessively thin, it may be difficult to handle the core material, or it may be difficult to enjoy the benefits of providing the core material (eg, the double-sided pressure-sensitive adhesive sheet is less likely to break). There is a concern to do. On the other hand, when the core is excessively thick, there is a concern that the entire double-sided PSA sheet becomes thick. Accordingly, the thickness of the core material is usually preferably in the range of about 2 to 50 ⁇ m, and preferably in the range of about 3 to 20 ⁇ m.
  • the thickness of the entire double-sided pressure-sensitive adhesive sheet is preferably about 100 ⁇ m or less, and more preferably 65 ⁇ m or less.
  • the thickness of the entire double-sided PSA sheet is preferably 10 ⁇ m or more, and more preferably 20 ⁇ m or more.
  • the release material is provided with a sheet-like support base material and has at least one release surface having release properties.
  • the release surface may be a surface opposite to the side facing the support substrate of the release agent layer provided on the surface of the support substrate that does not have releasability, or a support group having releasability. It may be one side of the material.
  • Examples of the support material for the release material include paper, synthetic paper, and resin film.
  • Examples of the paper include glassine paper and polyethylene laminated paper.
  • Examples of the resin film include polyolefin resins such as polyethylene resin and polypropylene resin, polyester resins such as polybutylene terephthalate resin and polyethylene terephthalate resin, acetate resin, polystyrene. Examples thereof include a resin film and a vinyl chloride resin film.
  • rubber containing elastomers such as olefin resins, isoprene resins, butadiene resins, long chain alkyl resins, alkyd resins, fluorine resins, silicone resins, etc. Is exemplified.
  • the thickness of the release agent layer formed on the support substrate is not particularly limited, but is preferably 0.05 to 2.0 ⁇ m, more preferably 0 when the release agent is applied in a solution state. .1 to 1.5 ⁇ m.
  • the thickness of the release agent layer is preferably 3 to 50 ⁇ m, and more preferably 5 to 40 ⁇ m.
  • Examples of the supporting substrate having a peelable surface include polyolefin resin films such as polypropylene resin films and polyethylene resin films, and films obtained by laminating these polyolefin resin films on paper or other films.
  • the thickness of the support base material for the release material is not particularly limited, it is usually about 15 ⁇ m or more and 300 ⁇ m or less.
  • the double-sided pressure-sensitive adhesive sheet according to this embodiment preferably does not contain a silicone-based material because the vaporized silicone compound adversely affects the operation of the HDD. It is preferable not to contain.
  • the release material attached to one side of the double-sided pressure-sensitive adhesive sheet can be easily peeled off from the other side It is possible to make the release material to be peeled off from the double-sided pressure-sensitive adhesive sheet different from each other, that is, to use a light release material and a heavy release material as the release material. Since workability
  • the pressure-sensitive adhesive layer-forming coating material is a material that contains a component for forming the pressure-sensitive adhesive layer and is used in the coating process for forming the pressure-sensitive adhesive layer. Means a fluid that has fluidity when placed in an environment of 23 ° C. and 50% relative humidity, and is not only a low-viscosity liquid when applied, but also a viscous material having a certain degree of viscosity. Including cases.
  • the component for forming an adhesive layer may be contained as a solute, and may be contained as a dispersoid.
  • the coating material for forming an adhesive layer according to the present embodiment has a particularly limited composition as long as the stress residual ratio is in the above-described range and contains a component for forming an adhesive layer including a crosslinked structure.
  • a solvent which may be a dispersion medium at the same time may be contained.
  • the pressure-sensitive adhesive layer-forming coating material does not have a carboxyl group as a component for providing a cross-linked structure included in the pressure-sensitive adhesive layer formed by the coating material. It contains a cross-linkable polymer including an acrylic polymer (carboxyl group-free acrylic polymer) and a TDI cross-linking agent.
  • a cross-linkable polymer including an acrylic polymer (carboxyl group-free acrylic polymer) and a TDI cross-linking agent.
  • the relationship between the content of the crosslinkable polymer and the TDI crosslinker in the coating material for forming the adhesive layer is such that the TDI crosslinker is 0.1 parts by mass or more and 10 parts by mass with respect to 100 parts by mass of the crosslinkable polymer. The following is preferable.
  • the gel fraction of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive layer-forming coating material is likely to be within the above-described range. It becomes easy to control the stress residual ratio of the pressure-sensitive adhesive layer formed of the material to less than 40%.
  • the pressure-sensitive adhesive layer-forming coating material may contain a crosslinking agent other than the TDI-based crosslinking agent as long as the residual stress ratio of the obtained pressure-sensitive adhesive layer is in the above range.
  • the coating material for forming the pressure-sensitive adhesive layer may contain components such as a coloring material, an antioxidant, and an ultraviolet absorber according to the components that the pressure-sensitive adhesive layer should contain.
  • the method for preparing the coating material for forming the pressure-sensitive adhesive layer is not limited, and it may be only necessary to mix the components for forming the pressure-sensitive adhesive layer, or the component and the solvent (there may be a dispersion medium at the same time). In some cases.
  • the component for forming an adhesive layer contains what should be melt
  • a first laminate and a second laminate each of which is a laminate of a release material and an adhesive layer, are prepared.
  • the above-mentioned pressure-sensitive adhesive layer-forming coating material is applied onto the surface on the release surface side of the first release material, and the coating film of the pressure-sensitive adhesive layer-forming coating material Is formed on the release material.
  • This coating method is not particularly limited, and conventionally known methods such as a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, and the like can be used.
  • the coating film of the adhesive layer-forming coating material on the release material is dried to obtain a first laminate in which the adhesive layer is laminated on the first release material.
  • This drying condition is arbitrary and may be left at room temperature, or the above-mentioned coating film may be heated to about 80 ° C., for example. What is necessary is just to set drying time suitably according to the thickness of a coating film, drying temperature, etc. For example, when heating the coating film to 80 ° C., the heating time can be set to about several minutes or less.
  • a core material is bonded to the pressure-sensitive adhesive surface of the first laminate to obtain a single-sided pressure-sensitive adhesive sheet.
  • the 2nd laminated body which consists of a 2nd peeling material and the adhesive layer laminated
  • the surface on the core material side of the single-sided pressure-sensitive adhesive sheet thus obtained and the surface on the pressure-sensitive adhesive layer side of the second laminate are bonded together and laminated in the order of the pressure-sensitive adhesive layer, the core material, and the pressure-sensitive adhesive layer.
  • the double-sided pressure-sensitive adhesive sheet is obtained in a state where the first release material and the second release material are respectively attached to the pressure-sensitive adhesive layer.
  • first release material and the second release material may have the same configuration or different configurations. As described above, if one is a light release material and the other is a heavy release material, a double-sided pressure-sensitive adhesive sheet excellent in workability can be obtained.
  • the drying conditions of the drying process for forming the adhesive layer in the first laminate and the second laminate are appropriately set (specifically, the coating film is heated to about 60 ° C. or more).
  • the reaction between the crosslinking agent in the coating film and the crosslinkable polymer can be advanced.
  • the implementation time is arbitrary and may be immediately after the drying process for forming the adhesive layer of each laminated body, or the first laminated body and the second laminated body may be directly or cored. It may be after carrying out the process of laminating via a material and forming a double-sided adhesive sheet.
  • the double-sided pressure-sensitive adhesive sheet according to the present embodiment is used to attach a component incorporated in a device such as an HDD or a relay to another component (may be temporarily attached). .
  • the device includes a part that does not allow foreign matters to adhere to at least a part of its surface, such as a hard disk or magnetic head in an HDD, or an electrical contact part in a relay.
  • the device includes such a component
  • the substance and / or precursor thereof that forms the above foreign substance from the PSA layer of the double-sided PSA sheet include organic substances such as carboxylic acids, inorganic substances such as silicone compounds, etc.
  • Probability is high.
  • the double-sided pressure-sensitive adhesive sheet according to the present embodiment is suitable for a device in which a part that dislikes the adhesion of foreign matter is incorporated because the possibility that these foreign matters and the outgas as a precursor thereof are released is reduced. Can be used for
  • the method for using the double-sided pressure-sensitive adhesive sheet according to the present embodiment will be specifically described by taking as an example the case where such a device is an HDD and an FPC is attached to a housing of the HDD (hereinafter abbreviated as “housing”). To do.
  • the adhesion surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet is the surface of the HDD housing (housing surface) and the surface of the FPC.
  • the casing is obtained by subjecting a member formed by die-casting or pressing a metal material such as an aluminum alloy to a surface treatment for improving corrosion resistance and appearance.
  • a surface treatment for improving corrosion resistance and appearance.
  • Specific examples of the surface treatment include anodization and electrodeposition coating using a paint containing an epoxy resin. Therefore, the housing adherend surface is composed of the surface of the layer formed by this surface treatment.
  • the adherend surface of the housing is not a flat surface but has an uneven surface for the purpose of improving the rigidity of the housing. That is, the housing adherent surface may have a highly bent surface such as a stepped portion surface.
  • the FPC is generally composed of a laminate (which may have an adhesive layer) of a resin film such as a polyimide film and a metal foil such as copper, and its main surface is the surface of the resin film.
  • a resin film such as a polyimide film
  • a metal foil such as copper
  • its main surface is the surface of the resin film.
  • the thickness of the FPC is about 10 ⁇ m to several hundred ⁇ m and has a certain degree of flexibility. Therefore, even if the housing adherend is a highly bent surface, the FPC can be deformed so as to substantially conform to the shape.
  • the FPC has a metal foil as a conductive member, when the FPC is bent so as to follow the shape of the highly bent surface of the housing adherence surface, if the minimum bending radius at the bent portion of the FPC becomes excessively small, The metal foil breaks at the part and breaks. For this reason, FPC has a bending elastic modulus of a certain degree or more to prevent the minimum bending radius from becoming too small.
  • the surface on the pressure-sensitive adhesive layer side of the laminate is applied to the case-adhered surface.
  • a restoring force based on this bending elasticity is generated in the FPC, and the force causes the laminated body to be separated from the housing adherent surface at the bent portion of the laminated body of the double-sided pressure-sensitive adhesive sheet and the FPC or in the vicinity thereof. Acts as a force. When the force is large, peeling may occur between the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet and the housing.
  • One of the measures for avoiding the occurrence of the above problem is to improve the adhesion between the housing surface and the surface of the pressure-sensitive adhesive layer facing the housing surface. What is necessary is just to raise the adhesiveness of the adhesive layer which makes the main surface of an adhesive sheet. However, if the composition of the pressure-sensitive adhesive layer is changed so as to increase the wettability of the housing to the adherend surface in order to increase the pressure-sensitive adhesive layer, there is a concern that the amount of outgas from the pressure-sensitive adhesive layer increases.
  • a restoring force similar to that of the FPC is generated in the adhesive layer constituting the double-sided adhesive sheet disposed between the housing and the FPC, and this restoring force also acts as a force that separates the FPC from the housing adherend surface.
  • the double-sided pressure-sensitive adhesive sheet according to this embodiment provided with a pressure-sensitive adhesive layer whose stress residual ratio is less than 40% is disposed between the housing and the FPC, the double-sided pressure-sensitive adhesive according to this embodiment will be described. It is possible to weaken the force acting on the laminate composed of the sheet and the FPC in the direction of separating the laminate from the housing adherend surface.
  • the double-sided pressure-sensitive adhesive sheet according to the present embodiment reduces the possibility of floating on a highly bent surface or in the vicinity thereof, and reduces the possibility of outgassing from the pressure-sensitive adhesive layer. Both are compatible.
  • Example 1 Crosslinkable polymer having butyl acrylate (BA), methyl acrylate (MA), acryloylmorpholine (ACMO) and 2-hydroxyethyl acrylate (HEA) as monomer components
  • the coating amount after drying the adhesive forming coating material using a knife coater on the release-treated surface of the first release material (light release material) [trade name “SP-PET 381031” manufactured by Lintec Corporation] was 25 g / the coating is m 2, obtained by the coating film was dried by heating at 100 ° C. for about 2 minutes to obtain a first laminate adhesive layer formed on a first release liner. Thereafter, a PET film having a thickness of 12 ⁇ m (trade name “Lumirror S10” manufactured by Toray Industries, Inc.) as a core material was laminated on the surface on the pressure-sensitive adhesive layer side of the first laminate to obtain a single-sided pressure-sensitive adhesive sheet.
  • a PET film having a thickness of 12 ⁇ m (trade name “Lumirror S10” manufactured by Toray Industries, Inc.) as a core material was laminated on the surface on the pressure-sensitive adhesive layer side of the first laminate to obtain a single-sided pressure-sensitive adhesive sheet.
  • the adhesive-forming coating material was applied to the release-treated surface of the second release material (heavy release material) [trade name “SP-PET3811” manufactured by Lintec Corporation] using a knife coater. It was applied so as to be 25 g / m 2, and the obtained coating film was dried by heating at 100 ° C. for about 2 minutes to obtain a second laminate in which an adhesive layer was formed on the second release material. It was.
  • the 2nd laminated body was bonded to the surface at the side of the core material of the said single-sided adhesive sheet, and the double-sided adhesive tape was produced.
  • Example 2 Implemented except that 0.3 parts by mass of tolylene diisocyanate crosslinking agent [trade name “BHS-8515”, solid content 37.5% by mass] manufactured by Toyo Ink Co., Ltd. was mixed to prepare a coating material for forming an adhesive.
  • a double-sided adhesive tape was prepared in the same manner as in Example 1.
  • Example 3 Implemented except that 0.6 parts by mass of tolylene diisocyanate crosslinker [trade name “BHS-8515”, solid content 37.5% by mass] manufactured by Toyo Ink Co., Ltd. was mixed to prepare a coating material for forming an adhesive.
  • a double-sided adhesive tape was prepared in the same manner as in Example 1.
  • Example 4 Implemented except that 1.2 parts by weight of tolylene diisocyanate cross-linking agent [trade name “BHS-8515”, solid content 37.5% by mass, manufactured by Toyo Ink Co., Ltd.] was mixed to prepare a coating material for forming an adhesive.
  • a double-sided adhesive tape was prepared in the same manner as in Example 1.
  • a double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that 0.4 part by mass was mixed to prepare a coating material for forming an adhesive layer.
  • Example 1 Example 1 except that 2.0 parts by mass of a xylene diisocyanate-based cross-linking agent [manufactured by Toyo Ink Manufacturing Co., Ltd., trade name “BXX5640”, solid content: 35.0% by mass] was mixed to prepare a coating material for forming an adhesive. A double-sided adhesive tape was prepared in the same manner as described above.
  • Example 2 Example 1 except that 3.0 parts by mass of xylene diisocyanate-based cross-linking agent [manufactured by Toyo Ink Manufacturing Co., Ltd., trade name “BXX5640”, solid content 35.0% by mass] was prepared to prepare a coating material for forming an adhesive.
  • a double-sided adhesive tape was prepared in the same manner as described above.
  • [Comparative Example 3] Implemented except that 3.0 parts by mass of tolylene diisocyanate cross-linking agent [trade name “BHS-8515”, solid content 37.5% by mass, manufactured by Toyo Ink Co., Ltd.] was mixed to prepare a coating material for forming an adhesive.
  • a double-sided adhesive tape was prepared in the same manner as in Example 1.
  • the second release material (heavy release material) was bonded to the surface of the first laminate on the pressure-sensitive adhesive layer side, and then these release materials were removed to obtain only the pressure-sensitive adhesive layer.
  • This pressure-sensitive adhesive layer was rolled into a cylindrical shape to prepare a sample for a tensile test.
  • the tensile test sample was pulled with a universal tensile tester at a tensile speed of 200 mm / min and a distance between chucks of 30 mm, and the stress A when the measurement target portion of the tensile test sample (30 mm portion between chucks) was extended by 5%.
  • B / A ⁇ 100 (%) was calculated from these measured stresses A and B, and the value was defined as the residual stress rate (%).
  • Table 1 shows the calculation results of the stress residual ratio.
  • the double-sided pressure-sensitive adhesive sheet of the example satisfying the conditions of the present invention is stuck in a state where the double-sided pressure-sensitive adhesive sheet is bent because the residual stress ratio of the pressure-sensitive adhesive layer included in the sheet is less than 40%. Even if it is done, the force which tries to restore
  • the printing sheet of the present invention has a low possibility of outgas generation and is excellent in adhesiveness, a part in which a part that dislikes adhesion of foreign matter is incorporated on the surface of a device such as an HDD or a relay, and a highly bent surface is used. It can be suitably used as a member for adhering to a housing or the like having it.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une feuille adhésive double face ayant une couche d'agent adhésif comprenant une structure réticulée obtenue par réaction d'un agent de réticulation et d'un polymère réticulable, et, dans un exemple, la feuille comprend de plus une âme dans laquelle la couche d'agent adhésif est laminée sur des surfaces primaires. Le taux de contrainte résiduelle de la couche d'agent adhésif est inférieur à 40 % et l'agent de réticulation contient du tolylène diisocyanate. De préférence, la couche d'agent adhésif est formée de telle sorte que le pourcentage de gel est de 10 à 70 %. Au moyen de cette feuille adhésive double face, il est peu probable qu'un pelage ait lieu, même si la surface de l'objet d'adhérence a une surface hautement incurvée, et le potentiel de dégazage est réduit.
PCT/JP2013/075269 2012-09-20 2013-09-19 Feuille adhésive double face pour un élément électronique WO2014046167A1 (fr)

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JP6393052B2 (ja) * 2014-03-20 2018-09-19 リンテック株式会社 両面粘着シートおよび粘着剤組成物
JP6543044B2 (ja) * 2015-02-23 2019-07-10 旭化成株式会社 ペリクル
CN110556399B (zh) * 2018-05-31 2020-10-27 浙江清华柔性电子技术研究院 柔性器件的过渡装置、制备方法及柔性器件贴片的方法

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JP2004323543A (ja) * 2003-04-21 2004-11-18 Nitto Denko Corp 光学部材用粘着剤組成物、光学部材用粘着剤層、粘着型光学部材および画像表示装置
JP2005179467A (ja) * 2003-12-18 2005-07-07 Nitto Denko Corp 光学フィルム用粘着剤組成物、光学フィルム用粘着剤層、粘着型光学フィルムおよび画像表示装置
JP2009062486A (ja) * 2007-09-07 2009-03-26 Lintec Corp 両面粘着シート

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JPH0733313U (ja) * 1993-12-02 1995-06-20 積水化学工業株式会社 救急絆創膏
JPH09154933A (ja) * 1995-12-12 1997-06-17 Nitto Denko Corp 医療用粘着テ−プ及び救急絆創膏

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2004323543A (ja) * 2003-04-21 2004-11-18 Nitto Denko Corp 光学部材用粘着剤組成物、光学部材用粘着剤層、粘着型光学部材および画像表示装置
JP2005179467A (ja) * 2003-12-18 2005-07-07 Nitto Denko Corp 光学フィルム用粘着剤組成物、光学フィルム用粘着剤層、粘着型光学フィルムおよび画像表示装置
JP2009062486A (ja) * 2007-09-07 2009-03-26 Lintec Corp 両面粘着シート

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