US20200190370A1 - Double-sided pressure-sensitive adhesive tape - Google Patents

Double-sided pressure-sensitive adhesive tape Download PDF

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Publication number
US20200190370A1
US20200190370A1 US16/621,014 US201816621014A US2020190370A1 US 20200190370 A1 US20200190370 A1 US 20200190370A1 US 201816621014 A US201816621014 A US 201816621014A US 2020190370 A1 US2020190370 A1 US 2020190370A1
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United States
Prior art keywords
pressure
sensitive adhesive
adhesive tape
resin
styrene
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Abandoned
Application number
US16/621,014
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English (en)
Inventor
Daisuke Watanabe
Takamine Sugiura
Akira Yamakami
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DIC Corp
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DIC Corp
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Assigned to DIC CORPORATION reassignment DIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUGIURA, TAKAMINE, WATANABE, DAISUKE, YAMAKAMI, AKIRA
Publication of US20200190370A1 publication Critical patent/US20200190370A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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
    • C08G18/80—Masked polyisocyanates
    • C08G18/8003—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen
    • C08G18/8006—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32
    • 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
    • B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
    • B32B43/006—Delaminating
    • 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
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • 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
    • C09J125/00—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 an aromatic carbocyclic ring; Adhesives based on derivatives of such polymers
    • C09J125/02—Homopolymers or copolymers of hydrocarbons
    • C09J125/04—Homopolymers or copolymers of styrene
    • C09J125/08—Copolymers of styrene
    • C09J125/10—Copolymers of styrene with conjugated dienes
    • 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
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • 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
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/383—Natural or synthetic rubber
    • 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
    • C08G2170/00—Compositions for adhesives
    • C08G2170/40—Compositions for pressure-sensitive adhesives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C09J2205/114—
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
    • 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
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
    • 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
    • C09J2415/00—Presence of rubber derivatives
    • 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
    • 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
    • C09J2453/00—Presence of block copolymer
    • 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
    • C09J2493/00—Presence of natural resin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
    • Y10T156/1168—Gripping and pulling work apart during delaminating

Definitions

  • the present invention relates to a double-sided pressure-sensitive adhesive tape.
  • a pressure-sensitive adhesive tape is widely used for fixing and the like of components configuring electronic equipment.
  • the pressure-sensitive adhesive tape is used for fixing sheet metals configuring comparatively large-sized electronic equipment such as flat-panel televisions, household electric appliances, or OA equipment to each other, or fixing an exterior component and a housing to each other, and fixing a rigid component such as an exterior component or a battery to comparatively small-sized electronic equipment such as portable electronic terminals, cameras, or personal computers.
  • a rugged shape may be formed or distortion may be generated, and it is necessary that the pressure-sensitive adhesive tape has conformity so that it can conform to the surface shapes thereof while exhibiting strong adhesion.
  • a reusable component which is used in a product is decomposed and reused after the usage in many cases for resource saving from a viewpoint of environmental harmony.
  • the pressure-sensitive adhesive tape it is necessary to peel off the pressure-sensitive adhesive tape bonded to a component, and the pressure-sensitive adhesive may remain on an adherend at the time of the peeling off, the pressure-sensitive adhesive tape may be cut, or a double-sided pressure-sensitive adhesive tape may break between non-woven fabric layers.
  • An object of the invention is to provide a pressure-sensitive adhesive tape having excellent conformity and adhesion with respect to an adherend, particularly, a hard adherend, and having excellent re-peeling properties of being capable of being stretched and peeled off in a horizontal direction of the pressure-sensitive adhesive tape, without the necessity for embrittling the pressure-sensitive adhesive tape by heating or by using an organic solvent or the like or without remaining of the pressure-sensitive adhesive on the adherends, in a case of peeling the pressure-sensitive adhesive tape.
  • the invention provides a pressure-sensitive adhesive tape including a pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive tape has a thickness greater than 150 ⁇ m and smaller than 1,500 ⁇ m, an elongation at break of 600% to 3,000%, and a stress at break of 2.5 to 80.0 MPa.
  • the pressure-sensitive adhesive tape of the invention has excellent conformity and can be strongly bonded, even in a case where hard adherends such as metal or plastic are bonded to each other, and can be cleanly peeled off by stretching in a horizontal direction, without any necessity for embrittling the pressure-sensitive adhesive tape by heating or by using an organic solvent or the like and without residue of the pressure-sensitive adhesive on the adherends, in a case of peeling the both adherends.
  • a pressure-sensitive adhesive tape of the invention is a pressure-sensitive adhesive tape having a thickness greater than 150 ⁇ m and smaller than 1,500 ⁇ m, an elongation at break of 600% to 3,000%, and a stress at break of 2.5 to 80.0 MPa.
  • the thickness of the pressure-sensitive adhesive tape is preferably greater than 150 ⁇ m, more preferably equal to or greater than 170 ⁇ m, even more preferably equal to or greater than 200 ⁇ m, and particularly preferably equal to or greater than 250 ⁇ m.
  • the thickness of the pressure-sensitive adhesive tape is preferably smaller than 1,500 ⁇ m, more preferably equal to or smaller than 1,400 ⁇ m, even more preferably equal to or smaller than 1,300 ⁇ m, and particularly preferably equal to or smaller than 1,200 ⁇ m.
  • the thickness of the pressure-sensitive adhesive tape is set in the range described above, because distortion or the like of an adherend is easily followed, excellent bonding strength is easily obtained, a stress necessary in a case of stretching and re-peeling off the pressure-sensitive adhesive tape in a horizontal direction is not excessively great.
  • a case where the pressure-sensitive adhesive tape of the invention has an adherend that is a hard material such as metal or plastic and has a large area is also assumed. In general, the larger the area of an adherend, it is more difficult to perform molding by suppressing distortion. By following distortion of such an adherend with the pressure-sensitive adhesive tape, it is possible to more accurately complete a fine mechanism such as electronic equipment, for example.
  • the elongation at break of the pressure-sensitive adhesive tape is preferably 600% to 3,000%, more preferably 650% to 2,800%, even more preferably 700% to 2,700%, and still preferably 750% to 2,600%.
  • the pressure-sensitive adhesive tape of the invention is a comparatively thick pressure-sensitive adhesive tape having a thickness greater than 150 ⁇ m and smaller than 1, 500 ⁇ m as described above, and has strong adhesion.
  • the peeling can be performed at a suitable tensile stress, even in a case where the pressure-sensitive adhesive tape is strongly bonded to the adherend, and the pressure-sensitive adhesive tape can be easily peeled off, without excessively stretching the pressure-sensitive adhesive tape in a peeling step, by setting the elongation at break in the range described above.
  • the stress at break of the pressure-sensitive adhesive tape is preferably 2.5 to 80.0 MPa, more preferably 3.0 to 60.0 MPa, even more preferably 3.5 to 30.0 MPa, and still preferably 4.0 to 20.0 MPa.
  • the pressure-sensitive adhesive tape is not torn and the pressure-sensitive adhesive tape is suitably easily stretched, even in a case of stretching and peeling off the pressure-sensitive adhesive tape, and a re-peeling operation by peeling is easily performed.
  • power necessary for stretching the pressure-sensitive adhesive tape for deformation also depends on the thickness of the pressure-sensitive adhesive tape. For example, in a case of stretching and re-peeling the pressure-sensitive adhesive tape having a great thickness and a high stress at break, the pressure-sensitive adhesive cannot be sufficiently stretched and cannot be re-peeled off.
  • the stress at 25% elongation of the pressure-sensitive adhesive tape is preferably 0.05 to 10.0 MPa, more preferably 0.1 to 5.0 MPa, even more preferably 0.15 to 3.0 MPa, and still preferably 0.2 to 2.0 MPa.
  • the stress at 25% elongation thereof is smaller than the range described above, the pressure-sensitive adhesive tape may be peeled off, in a case where a load is applied in a shear direction of the pressure-sensitive adhesive tape, while fixing hard adherends to each other.
  • the stress at 25% elongation thereof is greater than the range described above, the power necessary for stretching the pressure-sensitive adhesive tape becomes excessive, in a peeling step of the pressure-sensitive adhesive tape.
  • the stress at 50% elongation of the pressure-sensitive adhesive tape is preferably 0.05 to 10.5 MPa, more preferably 0.1 to 5.5 MPa, even more preferably 0.15 to 3.5 MPa, and still preferably 0.2 to 2.5 MPa.
  • the stress at 50% elongation of the pressure-sensitive adhesive tape in the range described above, it is possible to obtain a suitable bonding strength for the pressure-sensitive adhesive tape, and comparatively easy peel off even in the re-peeling step.
  • the stress at 50% elongation thereof is smaller than the range described above, the pressure-sensitive adhesive tape may be peeled off in a case where a load is applied in a shear direction of the pressure-sensitive adhesive tape, while fixing hard adherends to each other.
  • the stress at 50% elongation thereof is greater than the range described above, the power necessary for stretching the pressure-sensitive adhesive tape becomes excessive in a peeling step of the pressure-sensitive adhesive tape.
  • the stress at 50% elongation of the pressure-sensitive adhesive tape is preferably 100% to 160%, more preferably 103% to 150%, even more preferably 105% to 140%, and still preferably 110% to 130% of the stress at 25% elongation.
  • the storage elastic modulus E′ (23° C.) at 23° C. of the pressure-sensitive adhesive tape is preferably 1.0 ⁇ 10 4 to 1.0 ⁇ 10 8 Pa, more preferably 5.0 ⁇ 10 4 to 5.0 ⁇ 10 7 Pa, even more preferably 1.0 ⁇ 10 5 to 1.0 ⁇ 10 7 Pa, still preferably 3.0 ⁇ 10 5 to 8.0 ⁇ 10 6 Pa.
  • the pressure-sensitive adhesive tape of the invention is obtained by assuming a case where an adherend is a hard material such as metal or plastic and has a large area.
  • an adherend has a large area, it is difficult to perform molding by suppressing distortion.
  • the pressure-sensitive adhesive tape having the storage elastic modulus such distortion of the adherend described above can be followed with the pressure-sensitive adhesive tape and suitable adhesion can be obtained.
  • the 180° peel strength of the pressure-sensitive adhesive tape is preferably equal to or more than 5 N/20 nm, more preferably equal to or more than 7 N/20 mm, even more preferably equal to or more than 9 N/20 mm, and still preferably equal to or more than 12 N/20 mm.
  • the 180° peel strength of the pressure-sensitive adhesive tape is in the range described above, excellent adhesion is easily obtained, even in a case where the adherends are both rigid bodies.
  • the 180° peel strength which is less than the range described above shows a low interface bonding strength to the adherend. Accordingly, in a case where the pressure-sensitive adhesive tape is used for bonding the rigid bodies to each other, sufficient adhesive behavior may not be obtained.
  • the pressure-sensitive adhesive tape of the invention includes a pressure-sensitive adhesive layer.
  • a pressure-sensitive adhesive layer a pressure-sensitive adhesive known in the related art can be used.
  • the thickness of the pressure-sensitive adhesive layer varies depending on the configuration of the pressure-sensitive adhesive tape of the invention.
  • the thickness thereof is preferably greater than 150 ⁇ m, more preferably equal to or greater than 170 ⁇ m, even more preferably equal to or greater than 200 ⁇ m, and particularly preferably equal to or greater than 250 ⁇ m, under the condition of satisfying the thickness range of the pressure-sensitive adhesive tape of the invention.
  • the thickness of the pressure-sensitive adhesive tape is preferably smaller than 1,500 ⁇ m, more preferably equal to or smaller than 1,400 ⁇ m, even more preferably equal to or smaller than 1,300 ⁇ m, and particularly preferably equal to or smaller than 1,200 ⁇ m.
  • the thickness of the pressure-sensitive adhesive layer is preferably 1 ⁇ 2 to 1/500, more preferably 1 ⁇ 3 to 1/300, even more preferably 1 ⁇ 5 to 1/200, and still preferably 1/10 to 1/50, with respect to a thickness of a base material layer.
  • the cohesive force of the pressure-sensitive adhesive layer is lower than the cohesive force of the base material, and accordingly, in a case where the thickness of the pressure-sensitive adhesive layer is greater than the range described above, only the pressure-sensitive adhesive layer may remain on the adherend in the re-peeling step of the pressure-sensitive adhesive tape. In addition, in a case where the thickness of the pressure-sensitive adhesive layer is smaller than the range described above, the pressure-sensitive adhesive layer cannot be followed and the bonding strength may not be significantly deteriorated, in a case where the surface of the adherend has a rugged shape or the like.
  • the stress at break of the pressure-sensitive adhesive layer is preferably 0.5 to 25.0 MPa, more preferably 0.8 to 20.0 MPa, even more preferably 1.0 to 17.0 MPa, and still preferably 1.2 to 15.0 MPa. It is preferable that the stress at break of the pressure-sensitive adhesive layer is in the range described above, because excellent pressure-sensitive adhesion can be obtained, and in a case where the pressure-sensitive adhesive tape of the invention is stretched in a horizontal direction and peeled off, the pressure-sensitive adhesive component hardly remains on the adherend.
  • Examples of the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer include an acryl-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive such as a synthesis rubber-based pressure-sensitive adhesive or a natural rubber-based pressure-sensitive adhesive, and a silicone-based pressure-sensitive adhesive.
  • a pressure-sensitive adhesive containing an acrylic polymer and, if necessary, an additive such as a pressure-sensitive adhesive applying resin or a crosslinking agent can be used.
  • the acrylic polymer can be, for example, produced by polymerizing a monomer mixture containing a (meth)acrylic monomer.
  • alkyl (meth)acrylate and the like including an alkyl group having 1 to 12 carbon atoms can be used, and, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-hexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, cyclohexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate can be used alone or in combination of two or more kinds thereof.
  • alkyl (meth)acrylate including an alkyl group having 1 to 12 carbon atoms alkyl (meth)acrylate including an alkyl group having 4 to 12 carbon atoms is preferably used, alkyl (meth)acrylate including an alkyl group having 4 to 8 carbon atoms is more preferably used, and n-butyl acrylate is particularly preferably used, from a viewpoint of ensuring excellent adhesion to the adherend.
  • the content of the alkyl (meth)acrylate including an alkyl group having 1 to 12 carbon atoms is preferably 80% to 98.5% by mass and more preferably 90% to 98.5% by mass, with respect to a total amount of the monomer used in the producing of the acrylic polymer.
  • a high-polar vinyl monomer can be used, if necessary, other than the examples described above.
  • (meth)acrylic monomers such as a (meth)acrylic monomer including a hydroxyl group, a (meth)acrylic monomer including a carboxyl group, and a (meth)acrylic monomer including an amide group can be used alone or in combination of two or more kinds thereof.
  • a (meth)acrylic monomer such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, or 6-hydroxyhexyl (meth)acrylate can be used.
  • (meth)acrylic monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth)acrylic acid dimer, crotonic acid, and ethylene oxide-modified oxalic acid acrylate can be used, and among these, acrylic acid is preferably used.
  • (meth)acrylic monomers such as N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acrylamide, and N,N-dimethylacrylamide can be used.
  • sulfonic acid group-containing monomers such as vinyl acetate, ethylene oxide-modified succinic acid acrylate, and 2-acrylamido-2-methylpropane sulfonic acid can be used, in addition to the examples described above.
  • the content of the high-polar vinyl monomer is more preferably 1.5% to 20% by mass, more preferably 1.5% to 10% by mass, and even more preferably 2% to 8% by mass, with respect to a total amount of the monomers used in the producing of the acrylic polymer, because a pressure-sensitive adhesive layer having a good balance between a cohesive force, a holding force, and adhesion can be formed.
  • the vinyl monomer including a hydroxyl group is preferably used, in a case of using an element containing an isocyanate-based crosslinking agent as the pressure-sensitive adhesive.
  • the vinyl monomer including a hydroxyl group 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth) acrylate, or 6-hydroxyhexyl (meth) acrylate is preferably used.
  • the content of the vinyl monomer including a hydroxyl group is preferably 0.01% to 1.0% by mass and more preferably 0.03% to 0.3% by mass, with respect to a total amount of the monomers used in the producing of the acrylic polymer.
  • the acrylic polymer can be produced by polymerizing the monomer described above by a well-known polymerization method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, or an emulsion polymerization method, and is preferably produced by a solution polymerization method or a bulk polymerization method.
  • a well-known polymerization method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, or an emulsion polymerization method, and is preferably produced by a solution polymerization method or a bulk polymerization method.
  • a peroxide-based thermal polymerization initiator such as benzoyl peroxide or lauroyl peroxide, an azo thermal polymerization initiator such as azobisisobutylnitrile, an acetophenone-based photopolymerization initiator, a benzoin ether-based photopolymerization initiator, a benzyl ketal-based photopolymerization initiator, an acylphosphine oxide-based photopolymerization initiator, a benzoin-based photopolymerization initiator, or a benzophenone-based photopolymerization initiator can be used.
  • a peroxide-based thermal polymerization initiator such as benzoyl peroxide or lauroyl peroxide
  • an azo thermal polymerization initiator such as azobisisobutylnitrile
  • an acetophenone-based photopolymerization initiator such as benzoin ether-based photopolymerization initiator, a benz
  • the weight average molecular weight of the acrylic polymer obtained by the method described above is preferably 300,000 to 3,000,000 and more preferably 500,000 to 2,500,000, in terms of standard styrene measured by gel permeation chromatograph (GPC).
  • a value obtained in the measurement of the molecular weight by the GPC method is a standard polystyrene conversion value measured by a GPC device (HLC-8329GPC) manufactured by Tosoh Corporation, and the measurement conditions are as follows.
  • Standard polystyrene molecular weight 10,000 to 20,000,000 (manufactured by Tosoh Corporation)
  • a pressure-sensitive adhesive containing a pressure-sensitive adhesive applying resin is preferably used, in order to improve adhesion or surface bonding strength to an adherend.
  • a rosin-based pressure-sensitive adhesive applying resin a polymerized rosin-based pressure-sensitive adhesive applying resin, a polymerized rosin ester-based pressure-sensitive adhesive applying resin, a rosin phenol-based pressure-sensitive adhesive applying resin, a stabilized rosin ester-based pressure-sensitive adhesive applying resin, a disproportionated rosin ester-based pressure-sensitive adhesive applying resin, a hydrogenated rosin ester-based pressure-sensitive adhesive applying resin, a terpene-based pressure-sensitive adhesive applying resin, a terpene phenol-based pressure-sensitive adhesive applying resin, a petroleum resin-based pressure-sensitive adhesive applying resin, a (meth)acrylate-based pressure-sensitive adhesive applying resin, or the like can be used.
  • the pressure-sensitive adhesive applying resin the disproportionated rosin ester-based pressure-sensitive adhesive applying resin, the polymerized rosin ester-based pressure-sensitive adhesive applying resin, the rosin phenol-based pressure-sensitive adhesive applying resin, the hydrogenated rosin ester-based pressure-sensitive adhesive applying resin, the (meth)acrylate-based pressure-sensitive adhesive applying resin, and the terpene phenol-based pressure-sensitive adhesive applying resin, are preferably used alone or in combination of two or more kinds thereof.
  • the softening point of the pressure-sensitive adhesive applying resin is preferably 30° C. to 180° C., and more preferably 70° C. to 140° C., from a viewpoint of forming the pressure-sensitive adhesive layer having high adhesive performance.
  • the glass transition temperature thereof is preferably 30° C. to 200° C. and more preferably 50° C. to 160° C.
  • the content of the pressure-sensitive adhesive applying resin is preferably 5 parts by mass to 65 parts by mass and more preferably 8 parts by mass to 55 parts by mass with respect to 100 parts by mass of the acrylic polymer, from a viewpoint of easily ensuring adhesion to the adherend.
  • the acrylic pressure-sensitive adhesive it is preferable to use a pressure-sensitive adhesive containing a crosslinking agent, in order to further improving the cohesive force of the pressure-sensitive adhesive layer.
  • a crosslinking agent an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a metal chelate-based crosslinking agent, an aziridine-based crosslinking agent, or the like can be used.
  • the crosslinking agent a crosslinking agent which is mixed after producing the acrylic polymer to allow a crosslinking reaction to proceed is preferable, and the isocyanate-based crosslinking agent and the epoxy-based crosslinking agent having high reactivity with the acrylic polymer are preferably used.
  • Examples of the isocyanate-based crosslinking agent include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and trimethylolpropane-modified tolylene diisocyanate.
  • a trifunctional polyisocyanate-based compound is particularly preferable.
  • Examples of the trifunctional polyisocyanate-based compound include tolylene diisocyanate and a trimethylolpropane adduct thereof, and triphenylmethane isocyanate.
  • the gel fraction of the pressure-sensitive adhesive layer is preferably 10% to 70% by mass, more preferably 25% to 65% by mass, and even more preferably 35% to 60% by mass, from a viewpoint of obtaining a pressure-sensitive adhesive layer having excellent cohesiveness and adhesion.
  • the gel fraction indicates a value measured by the method described above.
  • a pressure-sensitive adhesive composition is applied on a release sheet so as to have a thickness after the drying of 50 ⁇ m, the release sheet which is dried at 100° C. for 3 minutes and aged at 40° C. for 2 days is cut to have a size of 50 mm ⁇ 50 mm, and this is set as a sample.
  • the mass (G1) of the sample before the toluene immersion is measured in advance
  • the toluene insoluble matter of the sample after the immersion in the toluene solution at 23° C. for 24 hours is separated by filtering with a 300 mesh wire net, the mass (G2) of a residue after the drying at 110° C. for 1 hour
  • the gel fraction is obtained by the following equation.
  • the weight (G3) of conductive fine particles in the sample is calculated from the mass (G1) of the sample and the composition of the pressure-sensitive adhesive.
  • a rubber material which can be normally used as a pressure-sensitive adhesive can be used, and as one particularly preferable aspect, a block copolymer of a polyaromatic vinyl compound and a conjugated diene compound can be suitably used, and particularly, a styrene-based resin such as a styrene-isoprene-styrene copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butylene copolymer, or a styrene-ethylene-propylene copolymer can be used.
  • a styrene-based resin such as a styrene-isoprene-styrene copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butylene copolymer, or a s
  • styrene-based resin used in the pressure-sensitive adhesive of the pressure-sensitive adhesive tape of the invention a styrene-isoprene copolymer or/and a styrene-isoprene-styrene copolymer or/and a mixture of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer can be used.
  • the styrene-based resin configured with the component applies excellent adhesive physical properties and a holding force to the pressure-sensitive adhesive tape of the invention.
  • the content of a structural unit represented by Chemical Formula (1) is preferably 10% to 80% by mass, more preferably 12% to 60% by mass, even more preferably 15% to 40% by mass, and still preferably 17% to 35% by mass, with respect to a total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. Therefore, it is possible to obtain excellent adhesion and heat resistance.
  • styrene resin a component containing two or more kinds of copolymers having different structures is used, and a component containing a combination of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer can be used.
  • the content of the styrene-isoprene copolymer is preferably 0% to 80% by mass, more preferably 0% to 77% by mass, even more preferably 0% to 75% by mass, and still preferably 0% to 70% by mass, with respect to a total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer.
  • the weight average molecular weight measured by using the gel permeation chromatograph (GPC) in terms of standard polystyrene is preferably 10,000 to 800,000, more preferably 30,000 to 500,000, and even more preferably 50,000 to 300,000. It is more preferable that the weight average molecular weight is in the range described above, because heat fluidity or compatibility during solvent dilution can be ensured, and accordingly, the pressure-sensitive adhesive tape having thermal durability with excellent workability in a manufacturing step can be obtained.
  • the styrene-based resin for example, a resin having a single structure such as a linear structure, a branched structure, or a multi-branched structure can be used, and a resin having a mixed structure of different structures can also be used.
  • the styrene-based resin having abundant linear structures is used in the pressure-sensitive adhesive layer, excellent adhesive performance is applied to the pressure-sensitive adhesive tape of the invention.
  • the styrene resin having a branched structure or a multi-branched structure in which a styrene block is provided on a molecular terminal can have a pseudo crosslinked structure, and excellent cohesive force can be applied, and accordingly, a high holding force can be applied. These are preferably used as a mixture in accordance with necessary properties.
  • a producing method of the styrene-isoprene-styrene copolymer is not particularly limited, a well-known producing method of the related art can be used, and the styrene-isoprene-styrene copolymer can be produced by the same method as that disclosed regarding the base material.
  • the pressure-sensitive adhesive applying resin can be used, and among these, a pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C. is preferably used. Therefore, it is possible to obtain a pressure-sensitive adhesive and a pressure-sensitive adhesive tape having excellent initial adhesion and thermal durability.
  • the softening point indicates a value measured by a method (dry bulb type) based on JISK 2207.
  • the pressure-sensitive adhesive applying resin for example, a pressure-sensitive adhesive applying resin which is solid at room temperature (23° C.) is preferably used, and petroleum resin such as a C 5 petroleum resin, a C 5 /C 9 petroleum resin, or an alicyclic petroleum resin can be used.
  • the petroleum resin is easily soluble with a polyisoprene structure configuring the styrene-based resin, and as a result, it is possible to further improve initial adhesive force and thermal durability of the pressure-sensitive adhesive and the pressure-sensitive adhesive tape.
  • the C 5 petroleum resin for example, the alicyclic petroleum resin can be used, and ESCOREZ 1202, 1304, 1401 (manufactured by Tonen Chemical Corporation), Wingtack 95 (manufactured by The Goodyear Tire & Rubber Company), Quintone K100, R100, F100 (manufactured by Zeon Corporation), and Picotac 95, Pico Pale 100 (manufactured by Rika Hercules Inc.) can be used.
  • ESCOREZ 1202, 1304, 1401 manufactured by Tonen Chemical Corporation
  • Wingtack 95 manufactured by The Goodyear Tire & Rubber Company
  • Quintone K100, R100, F100 manufactured by Zeon Corporation
  • Picotac 95, Pico Pale 100 manufactured by Rika Hercules Inc.
  • C 5 /C 9 petroleum resin a copolymer of the C 5 petroleum resin and the C 9 petroleum resin can be used, and for example, ESCOREZ 2101 (Tonex Co., Ltd.), Quintone G115 (manufactured by Zeon Corporation), and Hercotack 1149 (manufactured by Rika Hercules Inc.) can be used.
  • ESCOREZ 2101 Teonex Co., Ltd.
  • Quintone G115 manufactured by Zeon Corporation
  • Hercotack 1149 manufactured by Rika Hercules Inc.
  • the alicyclic petroleum resin is obtained by hydrogenation with respect to the C 9 petroleum resin described above, and, for example ESCOREZ 5300 (Tonex Co., Ltd.), ARKON P-100 (manufactured by Arakawa Chemical Industries, Ltd.), and Rigalite R101 (manufactured by Rika Hercules Inc.) can be used.
  • the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C. for example, a polymerized rosin resin, a C 9 petroleum resin, a terpene resin, rosin resin, terpene-phenol resin, a styrene resin, a coumarone-indene resin, a xylene resin, and a phenol resin can be used, in addition to the C 5 petroleum resin, the C 5 /C 9 petroleum resin, and the alicyclic petroleum resin.
  • the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C. a combination of the C 5 petroleum resin and the polymerized rosin resin is preferably used, from a viewpoint of both satisfying more excellent initial adhesion and thermal durability.
  • the content of the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C. is preferably 3% to 100% by mass, and more preferably 5% to 80% by mass, with respect to a total amount of the styrene-based resin, and it is preferable to use 5% to 80% by mass of the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C., from a viewpoint of obtaining a pressure-sensitive adhesive and a pressure-sensitive adhesive tape satisfying both excellent adhesion and excellent thermal durability.
  • a pressure-sensitive adhesive applying resin having a softening point equal to or lower than ⁇ 5° C. can also be used in combination with the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C.
  • a softening point indicates a value measured by a method based on the method regulated in JISK 2269.
  • a pressure-sensitive adhesive applying resin which is liquid at room temperature is preferably used as the pressure-sensitive adhesive applying resin having a softening point equal to or lower than ⁇ 5° C.
  • a pressure-sensitive adhesive applying resin which is liquid at room temperature is preferably used as the pressure-sensitive adhesive applying resin having a softening point equal to or lower than ⁇ 5° C.
  • Such a pressure-sensitive adhesive applying resin which is liquid at room temperature is preferably selected from the well-known pressure-sensitive adhesive applying resins.
  • liquid rubber such as process oil, polyester, or polybutene
  • polybutene is preferably used, from a viewpoint of exhibiting more excellent initial adhesion.
  • the content of the pressure-sensitive adhesive applying resin having a softening point equal to or lower than ⁇ 5° C. is preferably 0% to 40% by mass and more preferably 0% to 30% by mass, with respect to a total amount of the pressure-sensitive adhesive applying resin.
  • the content of the pressure-sensitive adhesive applying resin having a softening point equal to or lower than ⁇ 5° C. is preferably 0% to 40% by mass with respect to a total amount of the styrene-based resin, and in a case where the content thereof is 0% to 30% by mass, it is possible to improve initial adhesion to achieve excellent bonding, and to obtain sufficient thermal durability.
  • a mass ratio of the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C. and the pressure-sensitive adhesive applying resin having a softening point equal to or lower than ⁇ 5° C. is preferably 5 to 50 and more preferably 10 to 30, from a viewpoint of obtaining a pressure-sensitive adhesive and a pressure-sensitive adhesive tape satisfying both excellent initial adhesion and excellent holding force.
  • a mass ratio of the styrene-based resin and the pressure-sensitive adhesive applying resin represented by [styrene-based resin/pressure-sensitive adhesive applying resin] is preferably 0.5 to 10.0, and in a case where the mass ratio thereof is 0.6 to 9.0, it is possible to improve initial adhesion and obtain excellent thermal durability.
  • the mass ratio [styrene-based resin/pressure-sensitive adhesive applying resin] is preferably greater than 1, from a viewpoint of preventing the peeling (repulsion resistance) caused by a repulsive force of the pressure-sensitive adhesive tape, in a case where the pressure-sensitive adhesive tape is bonded to a curved surface or the like of an adherend, for example.
  • the age resistor a component which can be normally used for the pressure-sensitive adhesive can be used, and the components described in the section of the base material are used as an example.
  • Examples of a producing method of the pressure-sensitive adhesive layer include a cast method using an extrusion die, a uniaxial stretching method, a sequential quadratic stretching method, a simultaneously biaxial stretching method, an inflation method, a tube method, a calender method, and a solution method.
  • the producing method by the cast method using an extrusion die or the solution method can be suitably used, and the method may be selected in accordance with the controlling of the thickness of the pressure-sensitive adhesive layer and compatibility of the laminating method of the base material.
  • a method of performing direct coating on a base material with a roll coater or the like or a method using a pressure-sensitive adhesive layer which is temporarily formed on and peeled off from a release liner is used.
  • the release liner examples include paper such as Kraft paper, glassine paper, or fine paper; a resin film such as polyethylene, polypropylene (OPP, CPP), or polyethylene terephthalate; laminated paper obtained by laminating the paper and the resin film, and paper filled with clay or polyvinyl alcohol, one surface or both surfaces thereof are subjected to a peeling treatment such as a silicone-based resin.
  • a resin film such as polyethylene, polypropylene (OPP, CPP), or polyethylene terephthalate
  • the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of the invention may contain a filler.
  • filler configuring the pressure-sensitive adhesive tape of the invention one or more kinds of filler selected from the group consisting of various inorganic fillers such as metal, metal hydroxide, metal oxide, silicate, carbon, and silica, and organic beads can be used.
  • various inorganic fillers such as metal, metal hydroxide, metal oxide, silicate, carbon, and silica, and organic beads.
  • Examples of the metal include aluminum, magnesium, zirconium, calcium, barium, tin, nickel, titanium, copper, silver, and gold.
  • metal hydroxide examples include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide.
  • metal oxide examples include silicon oxide, magnesium oxide, zinc oxide, titanium oxide, zirconium oxide, iron oxide, aluminum oxide, and calcium oxide.
  • silicate examples include talc and mica.
  • the kind of the filler can be selected in accordance with the performance required for the pressure-sensitive adhesive tape, and for example, carbon is preferably used, in a case of applying coloring, concealing properties, and weather resistance.
  • the shape of the filler may be any of a regular shape or irregular shape, and a filler having a non-plate shape or a non-flake shape is preferably used.
  • the non-plate shape or the non-flake shape indicates a shape having an aspect ratio of approximately 1 to 10.
  • the shape having an aspect ratio of 1 to 10 is preferable, the shape having an aspect ratio of 1 to 9 is more preferable, and the shape having an aspect ratio of 1 to 8 is even more preferable.
  • a filler having an average particle diameter of 0.01 ⁇ m to 70 ⁇ m is preferably used, and a filler having an average particle diameter of 0.02 ⁇ m to 50 ⁇ m is more preferably used.
  • the average particle diameter is preferably 0.02 ⁇ m to 2 ⁇ m, more preferably 0.03 ⁇ m to 1 ⁇ m, even more preferably 0.03 ⁇ m to 0.5 ⁇ m, and still preferably 0.05 ⁇ m to 0.1 ⁇ m.
  • the carbon used an aggregate in which a plurality of primary particles are aggregated is formed, and a degree of development of the aggregate (structure) is shown with an oil absorption amount.
  • the oil absorption amount of the carbon as the filler is preferably 50 to 200 cc/100 g, more preferably 55 to 150 cc/100 g, even more preferably 60 to 120 cc/100 g, and still preferably 65 to 100 cc/100 g.
  • the content of the filler is preferably 1% by mass to 50% by volume, more preferably 2% to 40% by volume, more preferably 3% to 30% by volume, and even more preferably 5% to 25% by volume, with respect to a total mass of the components configuring the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of the invention.
  • an additive such as other polymer components, a crosslinking agent, an age resistor, an ultraviolet light absorber, a filler, a polymerization inhibitor, a surface modifier, an antistatic agent, an antifoaming agent, a viscosity modifier, a light stabilizer, a weather stabilizer, a heat stabilizer, an antioxidant, a leveling agent, an organic pigment, an inorganic pigment, a pigment dispersant, a plasticizer, a softener, a flame retardant, a metal deactivator, silica beads, or organic beads; or an inorganic filler such as silicon oxide, aluminum oxide, titanium oxide, zirconia, or antimony pentoxide can be used, if necessary, within a range not negatively affecting the properties.
  • an additive such as other polymer components, a crosslinking agent, an age resistor, an ultraviolet light absorber, a filler, a polymerization inhibitor, a surface modifier, an antistatic agent, an antifoaming agent, a visco
  • a base material is provided separately from the pressure-sensitive adhesive layer for bonding to an adherend.
  • the pressure-sensitive adhesive layer may be provided on one surface of the base material or may be provided on both surfaces, and it is preferable that the pressure-sensitive adhesive layer is provided on both surfaces.
  • the thickness thereof is preferably 100 to 1, 490 ⁇ m, more preferably 120 to 1,390 ⁇ m, even more preferably 150 to 1,290 ⁇ m, and still preferably 200 ⁇ m to 1,190 ⁇ m.
  • the thickness of the base material is set in the range described above, because the pressure-sensitive adhesive tape easily follows a distortion on an adherend, a high bonding strength is easily obtained, and a stress necessary for the re-peeling while stretching the pressure-sensitive adhesive tape in a horizontal direction is not excessively great.
  • the elongation at break of the base material of the pressure-sensitive adhesive tape is preferably 600% to 3,000%, more preferably 650% to 2,800%, even more preferably 700% to 2,700%, and still preferably 750% to 2,600%.
  • the elongation at break of the base material is equal to or smaller than the upper limit of the range described above, because an stretching distance in a tape horizontal direction, in a case of the re-peeling of the pressure-sensitive adhesive tape, is not excessively long, and the operation in a small space can be performed.
  • the stress at break of the base material is preferably 2.5 to 80.0 MPa, more preferably 3.0 to 60.0 MPa, even more preferably 3.5 to 30.0 MPa, and still preferably 4.0 to 20.0 MPa.
  • the pressure-sensitive adhesive tape is prevented from being torn and such that a load for stretching the pressure-sensitive adhesive tape is not excessive, even in a case of stretching and peeling off the pressure-sensitive adhesive tape, and accordingly, a re-peeling operation by peeling is easily performed.
  • power necessary for stretching the pressure-sensitive adhesive tape for deformation also depends on the thickness of the pressure-sensitive adhesive tape. For example, in a case of stretching and re-peeling the pressure-sensitive adhesive tape having a great thickness and a high stress at break, the pressure-sensitive adhesive cannot be sufficiently stretched and cannot be re-peeled off.
  • the stress at 25% elongation of the base material is preferably 0.15 to 10.0 MPa, more preferably 0.25 to 7.0 MPa, even more preferably 0.35 to 5.0 MPa, and still preferably 0.45 to 2.0 MPa.
  • the stress at 25% elongation of the pressure-sensitive adhesive tape in the range described above, it is possible to obtain a suitable bonding strength for the pressure-sensitive adhesive tape, and comparatively easy peel off even in a re-peeling step.
  • the stress at 25% elongation thereof is smaller than the range described above, the pressure-sensitive adhesive tape may be peeled off, in a case where a load is applied in a shear direction of the pressure-sensitive adhesive tape, while fixing hard adherends to each other.
  • the stress at 25% elongation thereof is greater than the range described above, the power necessary for stretching the pressure-sensitive adhesive tape becomes excessive in a peeling step of the pressure-sensitive adhesive tape.
  • the stress at 50% elongation of the base material is preferably 0.15 to 10.0 MPa, more preferably 0.25 to 7.0 MPa, even more preferably 0.35 to 5.0 MPa, and still preferably 0.50 to 2.0 MPa.
  • the stress at 50% elongation of the pressure-sensitive adhesive tape in the range described above, it is possible to obtain a suitable bonding strength for the pressure-sensitive adhesive tape, and comparatively easy peel off even in the re-peeling step.
  • the stress at 50% elongation thereof is smaller than the range described above, the pressure-sensitive adhesive tape may be peeled off, in a case where a load is applied in a shear direction of the pressure-sensitive adhesive tape, while fixing hard adherends to each other.
  • the stress at 50% elongation thereof is greater than the range described above, the power necessary for stretching the pressure-sensitive adhesive tape becomes excessive, in a peeling step of the pressure-sensitive adhesive tape.
  • the stress at 50% elongation of the base material of the pressure-sensitive adhesive tape is preferably 100% to 160%, more preferably 103% to 150%, even more preferably 105% to 140%, and still preferably 110% to 130% of the stress at 25% elongation.
  • the storage elastic modulus E′ (23° C.) at 23° C. of the base material is preferably 1.0 ⁇ 10 4 to 1.0 ⁇ 10 8 Pa, more preferably 5.0 ⁇ 10 4 to 5.0 ⁇ 10 7 Pa, even more preferably 1.0 ⁇ 10 5 to 1.0 ⁇ 10 7 Pa, still preferably 3.0 ⁇ 10 5 to 8.0 ⁇ 10 6 Pa.
  • the pressure-sensitive adhesive tape of the invention is obtained by assuming a case where an adherend is a hard material such as metal or plastic and has a large area.
  • an adherend has a large area, it is difficult to perform molding by suppressing distortion.
  • the pressure-sensitive adhesive tape having the storage elastic modulus such distortion of the adherend described above can be followed with the pressure-sensitive adhesive tape and suitable adhesion can be obtained.
  • a material which can exhibit the properties described above may be used, and for example, a block copolymer of a polyaromatic vinyl compound and a conjugated diene compound can be used, and particularly, a styrene-based resin such as a styrene-isoprene-styrene copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butylene copolymer, or a styrene-ethylene propylene copolymer can be used.
  • a styrene-based resin such as a styrene-isoprene-styrene copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butylene copolymer, or a styrene-ethylene propylene copolymer
  • a polyurethane resin such as ester polyurethane or ether polyurethane
  • a polyolefin resin such as polyethylene or polypropylene
  • a polyester resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate
  • a polyurethane resin such as ester polyurethane or ether polyurethane
  • a polyolefin resin such as polyethylene or polypropylene
  • a polyester resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate
  • polystyrene polycarbonate, polymethylpentene, polysulfone, polyetheretherketone, polyethersulfone, polyetherimide,
  • the styrene-based resin such as the styrene-isoprene-styrene copolymer, the styrene-butadiene-styrene copolymer, the styrene-ethylene-butylene copolymer, or a styrene-ethylene-propylene copolymer; and the polyurethane resin such as ester-based polyurethane or ether-based polyurethane can be suitably used, because suitable elongation at break or stress at break is easily obtained, and particularly, the styrene-based resin such as the styrene isoprene styrene copolymer, the styrene butadiene styrene copolymer, the styrene ethylene butylene copolymer, or a styrene ethylene propylene copolymer can be suitably used.
  • a styrene-based resin film in which a main component of a resin component is a styrene-based resin is preferable, and the styrene-based resin film in which the styrene-based resin occupies greater than 50% in terms of the resin composition percentage can be generally used.
  • the styrene-based resin is a resin showing thermoplasticity, excellent molding properties such as extrusion molding or injection molding is obtained, and accordingly, the base material for configuring the pressure-sensitive adhesive tape of the invention is easily molded.
  • the resin group generally called a thermoplastic resin
  • the styrene-based resin easily exhibits particularly excellent elongation at break and can be suitably used as the base material of the pressure-sensitive adhesive tape of the invention.
  • a percentage of the styrene-based resin occupying the resin component included in the styrene-based resin film is preferably 50% to 100%, more preferably 60% to 100%, even more preferably 65% to 100%, and still preferably 70% to 100%. By setting the percentage thereof in the range described above, it is possible to obtain excellent elongation at break and stress at break of the styrene-based resin film.
  • various thermoplastic resin such as polyolefin or polycarbonate can be used, and one kind or a plurality of kinds can be used at the same time.
  • the styrene-based resin used in the base material of the pressure-sensitive adhesive tape is the styrene-isoprene copolymer or/and the styrene-isoprene-styrene copolymer or/and a mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer.
  • the content of a structural unit represented by Chemical Formula (2) is preferably 13% to 60% by mass, more preferably 15% to 50% by mass, even more preferably 16% to 45% by mass, and still preferably 17% to 35% by mass, with respect to a total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. Therefore, the elongation at break or the stress at break is easily obtained in the suitable ranges.
  • styrene resin a component containing two or more kinds of copolymers having different structures is used, and a component containing a combination of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer can be used.
  • the content of the styrene-isoprene copolymer is preferably 0% to 80% by mass, more preferably 0% to 70% by mass, even more preferably 0% to 50% by mass, and still preferably 0% to 30% by mass, with respect to a total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer.
  • the content thereof in the range described above, it is possible to satisfy both excellent elongation at break or stress at break, and thermal durability.
  • the weight average molecular weight measured by using the gel permeation chromatograph (GPC) in terms of standard polystyrene is preferably 10,000 to 800,000, more preferably 30,000 to 500,000, and even more preferably 50,000 to 300,000. It is more preferable that the weight average molecular weight is in the range described above, because heat fluidity or compatibility during solvent dilution can be ensured, and accordingly, the pressure-sensitive adhesive tape having thermal durability with excellent workability in a manufacturing step can be obtained.
  • the styrene-based resin for example, a resin having a single structure such as a linear structure, a branched structure, or a multi-branched structure can be used, and a resin having a mixed structure of different structures can also be used.
  • the styrene-based resin having a large number of linear structures applies excellent elongation at break to the pressure-sensitive adhesive tape of the invention.
  • the styrene resin having a branched structure or a multi-branched structure in which a styrene block is provided on a molecular terminal can have a pseudo crosslinked structure, and excellent cohesive force can be applied. Therefore, these are preferably used as a mixture in accordance with necessary properties.
  • a producing method of the styrene-isoprene-styrene copolymer is not particularly limited, and a well-known producing method of the related art can be used. For example, a method of sequentially polymerizing a styrene block and an isoprene block by an anionic living polymerization method, or a method of producing a block copolymer which is reacted and coupled with a coupling agent, after producing a block copolymer including a living active terminal is used.
  • the producing method of the styrene-isoprene copolymer is not particularly limited, and a well-known producing method of the related art can be used. For example, a method of sequentially polymerizing a styrene block and an isoprene block by an anionic living polymerization method is used.
  • the producing method of the mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer is not particularly limited, and a well-known producing method of the related art can be used. For example, a method mixing and using the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer produced as described above is used. In addition, the mixture can also be produced at the same time in one polymerization step.
  • anionic living polymerization method first, a styrene monomer is polymerized using an anionic polymerization initiator, and a polystyrene block having a living active terminal is formed. Secondly, isoprene is polymerized from the living active terminal of the polystyrene block, and a styrene-isoprene diblock copolymer including a living active terminal is obtained.
  • a part of the styrene-isoprene diblock copolymer including a living active terminal and a coupling agent are reacted with each other, and a coupled styrene-isoprene-styrene copolymer is formed.
  • a living active terminal of a residue of the styrene-isoprene diblock copolymer including a living active terminal is deactivated with a polymerization terminator, and the styrene-isoprene diblock copolymer is formed.
  • the pressure-sensitive adhesive applying resin can be used, in order to increase adhesion to the pressure-sensitive adhesive layer or increase heat resistance.
  • the pressure-sensitive adhesive applying resin having a softening point equal to or higher than 80° C. can be suitably used, and the softening point thereof is more preferably equal to or higher than 90° C., even more preferably equal to or higher than 100° C., and still preferably equal to or higher than 110° C.
  • the softening point indicates a value measured by a method (dry bulb type) based on JISK 2207.
  • a pressure-sensitive adhesive applying resin for example, a pressure-sensitive adhesive applying resin which is solid at room temperature (23° C.) is preferably used, and petroleum resin such as a C 5 petroleum resin, a C 5 /C 9 petroleum resin, or an alicyclic petroleum resin can be used.
  • the petroleum resin is easily soluble with a polyisoprene structure configuring the styrene-isoprene copolymer or the styrene-isoprene-styrene copolymer, and as a result, it is possible to further improve initial adhesive force and thermal durability of the pressure-sensitive adhesive tape.
  • the C 5 petroleum resin for example, the alicyclic petroleum resin can be used, and ESCOREZ 1202, 1304, 1401 (manufactured by Tonen Chemical Corporation), Wingtack 95 (manufactured by The Goodyear Tire & Rubber Company), Quintone K100, R100, F100 (manufactured by Zeon Corporation), and Picotac 95, Pico Pale 100 (manufactured by Rika Hercules Inc.) can be used.
  • ESCOREZ 1202, 1304, 1401 manufactured by Tonen Chemical Corporation
  • Wingtack 95 manufactured by The Goodyear Tire & Rubber Company
  • Quintone K100, R100, F100 manufactured by Zeon Corporation
  • Picotac 95, Pico Pale 100 manufactured by Rika Hercules Inc.
  • C 5 /C 9 petroleum resin a copolymer of the C 5 petroleum resin and the C 9 petroleum resin can be used, and for example, ESCOREZ 2101 (Tonex Co., Ltd.), Quintone G115 (manufactured by Zeon Corporation), and Hercotack 1149 (manufactured by Rika Hercules Inc.) can be used.
  • ESCOREZ 2101 Teonex Co., Ltd.
  • Quintone G115 manufactured by Zeon Corporation
  • Hercotack 1149 manufactured by Rika Hercules Inc.
  • the alicyclic petroleum resin is obtained by hydrogenation with respect to the C 9 petroleum resin described above, and, for example ESCOREZ 5300 (Tonex Co., Ltd.), ARKON P-100 (manufactured by Arakawa Chemical Industries, Ltd.), and Rigalite R101 (manufactured by Rika Hercules Inc.) can be used.
  • a polymerized rosin resin, a C 9 petroleum resin, a terpene resin, rosin resin, terpene-phenol resin, a styrene resin, a coumarone-indene resin, a xylene resin, and a phenol resin can be used, in addition to the C 5 petroleum resin, the C 5 /C 9 petroleum resin, and the alicyclic petroleum resin.
  • the pressure-sensitive adhesive applying resin a combination of the C 5 petroleum resin and the polymerized rosin resin is preferably used, from a viewpoint of both satisfying more excellent initial adhesion and thermal durability.
  • the content of the pressure-sensitive adhesive applying resin is preferably 0% to 100% by mass, and more preferably 0% to 70% by mass, even more preferably 0% to 50% by mass, and still preferably 0% to 30% by mass with respect to a total amount of the styrene-isoprene copolymer or the styrene-isoprene-styrene copolymer.
  • an additive such as other polymer components, a crosslinking agent, an age resistor, an ultraviolet light absorber, a filler, a polymerization inhibitor, a surface modifier, an antistatic agent, an antifoaming agent, a viscosity modifier, a light stabilizer, a weather stabilizer, a heat stabilizer, an antioxidant, a leveling agent, an organic pigment, an inorganic pigment, a pigment dispersant, silica beads, or organic beads; or an inorganic filler such as silicon oxide, aluminum oxide, titanium oxide, zirconia, or antimony pentoxide can be used, if necessary, within a range not negatively affecting the properties.
  • an additive such as other polymer components, a crosslinking agent, an age resistor, an ultraviolet light absorber, a filler, a polymerization inhibitor, a surface modifier, an antistatic agent, an antifoaming agent, a viscosity modifier, a light stabilizer, a weather stabilizer, a heat stabilizer, an antioxidant
  • the age resistor for example, a phenol-based age resistor is preferably used, because it is possible to effectively improve thermal stability of the styrene-isoprene copolymer, and as a result, it is possible to obtain a pressure-sensitive adhesive and a pressure-sensitive adhesive tape maintaining excellent initial adhesion and having more excellent thermal durability.
  • a phenol-based age resistor including a steric hindrance group is generally used, and a monophenol type, a bisphenol type, or a polyphenol type are representatives.
  • the content of the phenol-based age resistor is preferably 0.1 parts by mass to 5 parts by mass with respect to the 100 parts by mass of the styrene-isoprene block copolymer, and in a case where the content thereof is 0.5 parts by mass to 3 parts by mass, it is possible to effectively improve thermal stability of the styrene-isoprene copolymer, and as a result, it is possible to obtain a pressure-sensitive adhesive maintaining excellent initial adhesion and having more excellent thermal durability.
  • the age resistor a combination of the phenol-based age resistor and other phenol-based age resistor such as a phosphorus-based age resistor (referred to as a processing stabilizer), an amine-based age resistor, or an imidazole-based age resistor may be used, and particularly, in a case where a combination of the phenol-based age resistor and the phosphorus-based age resistor is used, it is possible to obtain a pressure-sensitive adhesive maintaining excellent initial adhesion and having more excellent thermal durability.
  • a processing stabilizer phosphorus-based age resistor
  • an amine-based age resistor referred to as a processing stabilizer
  • imidazole-based age resistor an imidazole-based age resistor
  • the phosphorus-based age resistor may be slightly discolored (turned into yellow) over time in a high temperature environment, and accordingly, the used amount thereof is preferably suitably set by considering a balance between the initial adhesion, thermal durability, and discoloring prevention.
  • polyurethane As the material used in the base material of the pressure-sensitive adhesive tape of the invention, polyurethane can also be suitably used.
  • a reactant of polyol (b1-1) and polyisocyanate (b1-2) can be suitably used.
  • polyether polyol for example, polyether polyol, polyester polyol, and polycarbonate polyol can be used.
  • polyester polyol and polyether polyol can be used alone or in combination of two or more kinds thereof.
  • polyester polyol is preferably used, and in a case where water resistance or biodegradation resistance is necessary, polyether polyol is preferably used.
  • polyester polyol which can be used as the polyol (b1-1), for example, a component obtained by esterification reaction between a low-molecular-weight polyol and polycarboxylic acid, polyester obtained by a ring-opening polymerization reaction of a cyclic ester compound such as ⁇ -caprolactone, and a copolymerization polyester thereof can be used.
  • low-molecular-weight polyol for example, aliphatic alkyl glycol such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, or 1,3-butanediol having a molecular weight of approximately 50 to 300, or cyclohexane dimethanol can be used.
  • aliphatic alkyl glycol such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, or 1,3-butanediol having a molecular weight of approximately 50 to 300, or cyclohexane dimethanol
  • polycarboxylic acid which can be used in the producing of the polyester polyol
  • aliphatic dicarboxylic acid such as succinic acid, adipic acid, sebacic acid, or dodecanedicarboxylic acid
  • aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, phthalic acid, or naphthalenedicarboxylic acid, and anhydride or esterified product thereof can be used.
  • polyether polyol can be used as the polyol (b1-1).
  • polyether polyol for example, a component obtained by additional polymerization of alkylene oxide using one kind or two or more kinds of a compound having two or more active hydrogen atoms as an initiator can be used.
  • polycarbonate polyol can be used.
  • a component obtained by reacting carbonate ester and/or phosgene and a low-molecular polyol which will be described later with each other can be used.
  • carbonate ester for example, methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, or diphenyl carbonate can be used.
  • low-molecular polyol which can be reacted with carbonate ester or phosgene
  • ethylene glycol for example, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, tripropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 2,5-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol,
  • polystyrene resin b1-1
  • other polyols can be used, in addition to the examples described above.
  • acrylic polyol is used as the other polyols.
  • polyisocyanate (b1-2) alicyclic polyisocyanate, aliphatic polyisocyanate, or aromatic polyisocyanate can be used, and alicyclic polyisocyanate is preferably used.
  • alicyclic polyisocyanate for example, isophorone diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, 4,4′-dicyclohexylmethane diisocyanate, 2,4- and/or 2,6-methylcyclohexane diisocyanate, cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, bis (2-isocyanatoethyl)-4-cyclohexylene-1,2-dicarboxylate and 2,5- and/or 2,6-norbornane diisocyanate, dimer acid diisocyanate, and bicycloheptane triisocyanate can be used alone or in combination of two or more kinds thereof.
  • a method of reacting the polyol (b1-1) and polyisocyanate (b1-2) with each other to produce polyurethane (b1) for example, a method of removing moisture by heating the polyol (b1-1) put in a reaction vessel under the condition of normal pressure or reduced pressure, and collectively or separately supplying and reacting the polyisocyanate (b1-2) is used.
  • an equivalent ratio of an isocyanate group including the polyisocyanate (b1-2) and a hydroxyl group including the polyol (b1-1) is preferably 1.0 to 20.0, more preferably 1.1 to 13.0, even more preferably 1.2 to 5.0, and particularly preferably 1.5 to 3.0.
  • reaction conditions temperature, time, and the like
  • a reaction temperature is preferably 70° C. to 120° C.
  • a reaction time is preferably 30 minutes to 5 hours.
  • a tertiary amine catalyst or an organic metal catalyst can be used, for example, as a catalyst, if necessary.
  • reaction may be performed in an environment without a solvent, or may be performed under the presence of an organic solvent.
  • an ester-based solvent such as methyl acetate, ethyl acetate, propyl acetate, or butyl acetate
  • a ketone-based solvent such as acetone, methyl ethyl ketone, methyl butyl ketone, or cyclohexanone
  • an ether ester-based solvent such as methyl cellosolve acetate or butyl cellosolve acetate
  • an aromatic hydrocarbon-based solvent such as toluene or xylene
  • an amide-based solvent such as dimethylformamide or dimethylacetamide
  • the organic solvent may be removed by a suitable method such as reduced pressure heating or normal pressure drying, in the middle of the producing of the polyurethane (b1) or after producing the polyurethane (b1).
  • the softening temperature is preferably equal to or higher than 40° C. and more preferably equal to or higher than 50° C.
  • the softening temperature indicates a value measured based on JIS K 2207.
  • the upper limit of the softening temperature is suitably equal to or lower than 100° C.
  • a base material on which a primer layer is provided or a base material subjected to a surface treatment such as a roughening treatment, a corona discharge treatment, a chromic acid treatment, a flame treatment, a hot air treatment, an ozone treatment, a ultraviolet irradiation treatment, or an oxidation treatment on the surface by a sand blast method or a solvent treatment method can be used.
  • a surface treatment such as a roughening treatment, a corona discharge treatment, a chromic acid treatment, a flame treatment, a hot air treatment, an ozone treatment, a ultraviolet irradiation treatment, or an oxidation treatment on the surface by a sand blast method or a solvent treatment method
  • Examples of the producing method of the base material include a cast method using an extrusion die, a uniaxial stretching method, a sequential quadratic stretching method, a simultaneously biaxial stretching method, an inflation method, a tube method, a calendar method, and a solution method.
  • the producing method by the cast method using an extrusion die, the uniaxial stretching method, the sequential quadratic stretching method, the simultaneously biaxial stretching method, the inflation method, or the tube method can be suitably used, and the method may be selected in accordance with a mechanical strength necessary for the pressure-sensitive adhesive tape of the invention.
  • the base material may have a single layer structure or a multi-layer structure having two layers or three or more layers.
  • at least one layer is preferably a layer having the resin composition described above, because necessary mechanical properties are easily exhibited.
  • a base material having a three-layer structure can be obtained by a method of coextrusion of a thermoplastic resin such as polypropylene and the styrene-isoprene-styrene copolymer. This can be used as a suitable configuration, in a case of applying suitable dimensional stability or stiffness for the pressure-sensitive adhesive tape of the invention, for example.
  • n-butyl acrylate 60 parts by mass of n-butyl acrylate, 35.95 parts by mass of 2-ethylhexyl acrylate, 4.0 parts by mass of acrylic acid, 0.05 parts by mass of 4-hydroxybutyl acrylate, and 0.2 parts by mass of 2,2′-azobisisobutylnitrile as a polymerization initiator were dissolved in a mixed solvent of 50 parts by mass of ethyl acetate and 20 parts by mass of n-hexane, and these were polymerized at 70° C.
  • a resin composition (2) (mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer, styrene-derived structural unit represented by Chemical Formula (1): 24% by mass, rate of styrene-isoprene copolymer with respect to a total amount of the resin composition 2: 67% by mass), 40 parts by mass of Quintone G115 (C 5 /C 9 petroleum resin manufactured by Zeon Corporation, softening point: 115° C.), 30 parts by mass of Pencel D-160 (polymerized rosin ester resin manufactured by manufactured by Arakawa Chemical Industries, Ltd., softening point: 150° C.
  • a resin composition (2) mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer, styrene-derived structural unit represented by Chemical Formula (1): 2
  • Nisseki Polybutene HV-50 Polybutene manufactured by JXTG Nippon Oil & Energy Corporation, softening point: ⁇ 12.5° C.
  • an age resistor tetrakis-[methylene-3-(3′ 5′-di-t-butyl-4-hydroxyphenyl) propionate]methane
  • a resin composition (1) (mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer, styrene-derived structural unit represented by Chemical Formula (1): 25% by mass, rate of styrene-isoprene copolymer with respect to a total amount of the resin composition 1: 17% by mass), 16 parts by mass of Quintone G115 (C 5 /C 9 petroleum resin manufactured by Zeon Corporation, softening point: 115° C.), 12 parts by mass of Pencel D-160 (polymerized rosin ester resin manufactured by manufactured by Arakawa Chemical Industries, Ltd., softening point: 150° C.
  • Nisseki Polybutene HV-50 Polybutene manufactured by JXTG Nippon Oil & Energy Corporation, softening point: ⁇ 12.5° C.
  • an age resistor tetrakis-[methylene-3-(3′5′-di-t-butyl-4-hydroxyphenyl) propionate]methane
  • Nisseki Polybutene HV-50 Polybutene manufactured by JXTG Nippon Oil & Energy Corporation, softening point: ⁇ 12.5° C.
  • an age resistor tetrakis-[methylene-3-(3′5′-di-t-butyl-4-hydroxyphenyl) propionate]methane
  • Nisseki Polybutene HV-50 Polybutene manufactured by JXTG Nippon Oil & Energy Corporation, softening point: ⁇ 12.5° C.
  • an age resistor tetrakis-[methylene-3-(3′5′-di-t-butyl-4-hydroxyphenyl) propionate]methane
  • Nisseki Polybutene HV-50 Polybutene manufactured by JXTG Nippon Oil & Energy Corporation, softening point: ⁇ 12.5° C.
  • an age resistor tetrakis-[methylene-3-(3′ 5′-di-t-butyl-4-hydroxyphenyl) propionate]methane
  • SK-Dyne 909A manufactured by Soken Chemical & Engineering Co., Ltd., acrylic pressure-sensitive adhesive, solid content: 24.5% by mass
  • MA220 manufactured by Mitsubishi Chemical Corporation, carbon black
  • CORONATE L-45 manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content: 45% by mass
  • Nisseki Polybutene HV-50 Polybutene manufactured by JXTG Nippon Oil & Energy Corporation, softening point: ⁇ 12.5° C.
  • an age resistor tetrakis-[methylene-3-(3′5′-di-t-butyl-4-hydroxyphenyl) propionate]methane
  • the pressure-sensitive adhesive (1) was applied on a release liner by an applicator so that a thickness after drying becomes 5 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive (1) was produced.
  • the resin composition (1) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 200 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (1) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 1, except that the thickness of the resin composition (1) was set as 400 ⁇ m.
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 1, except that the thickness of the resin composition (1) was set as 1,000 ⁇ m.
  • the resin composition (2) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 200 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (1) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • a pressure-sensitive adhesive tape was produced, in the same manner as in Example 4, except that the thickness of the resin composition (2) was set as 1,000 ⁇ m.
  • the pressure-sensitive adhesive (1) was applied on a release liner with an applicator so that a thickness after drying becomes 25 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive (2) was produced.
  • the pressure-sensitive adhesive layer (2) produced as described above was bonded to both surfaces of a sheet-like resin composition (3) (ester-based polyurethane compound) having a thickness of 100 ⁇ m, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • a sheet-like resin composition (3) esteer-based polyurethane compound
  • the pressure-sensitive adhesive (2) was applied on a surface of a release liner so that a thickness of the pressure-sensitive adhesive layer after drying becomes 5 ⁇ m, and dried at 85° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive layer (3) was produced.
  • the resin composition (1) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 200 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (3) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (3) was applied on release paper with an applicator so that a thickness after drying becomes 5 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive (4) was produced.
  • the resin composition (1) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 200 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (4) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (3) was applied on a release liner with an applicator so that a thickness after drying becomes 25 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive (5) was produced.
  • the resin composition (1) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 200 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (5) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (4) was applied on release paper with an applicator so that a thickness after drying becomes 200 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (5) was applied on release paper with an applicator so that a thickness after drying becomes 200 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (6) was applied on release paper with an applicator so that a thickness after drying becomes 200 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (7) was applied on release paper with an applicator so that a thickness after drying becomes 450 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 13, except that the thickness of the pressure-sensitive adhesive (7) was set as 750 ⁇ m.
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 13, except that the thickness of the pressure-sensitive adhesive (7) was set as 300 ⁇ m.
  • the pressure-sensitive adhesive (8) was applied on a release liner with an applicator so that a thickness after drying becomes 50 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive (6) was produced.
  • the resin composition (1) (mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer, styrene-derived structural unit represented by Chemical Formula (1): 25% by mass, rate of styrene-isoprene copolymer with respect to a total amount of the resin composition 1: 17% by mass) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 250 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (6) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 16, except that 1 part by mass of BLACK PEARLS 120 (manufactured by Cabot Corporation, carbon black) was blended with the resin composition (1).
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 1, except that a PET film having a thickness of 188 ⁇ m was used as the base material, instead of the resin composition (1).
  • the resin composition (4) was heat-pressed (pressure: 0.5 MPa, press plate temperature: 130° C., press time: 2 minutes), and accordingly, a base material having a thickness of 200 ⁇ m was produced.
  • the pressure-sensitive adhesive layer (1) produced as described above was bonded to both surfaces thereof, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive layer (1) produced as described above was bonded to both surfaces of the sheet-like resin composition 3 having a thickness of 100 ⁇ m, pressurized at 0.2 MPa, and laminated, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (1) was applied on a release liner by an applicator so that a thickness after drying becomes 200 ⁇ m, and dried at 65° C. for 10 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (8) was applied on release paper by an applicator so that a thickness after drying becomes 200 ⁇ m, and dried at 65° C. for 10 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • the pressure-sensitive adhesive (3) was applied on a release liner by an applicator so that a thickness after drying becomes 200 ⁇ m, and dried at 80° C. for 3 minutes, and accordingly, a pressure-sensitive adhesive tape was produced.
  • a pressure-sensitive adhesive tape was produced in the same manner as in Example 1, except that the thickness of the resin composition (1) was set as 100 ⁇ m.
  • the stress at break, the elongation at break, the stress at 25% elongation, and the stress at 50% elongation of the pressure-sensitive adhesive tape were measured by punching the pressure-sensitive adhesive tape in a dumbbell shape having a length of marked line of 20 mm and a width of 10 mm, and pulling in a length direction at a tension rate of 300 mm/min, by using a Tensilon tension tester, under the condition of a measurement atmosphere of 23° C. and 50% RH.
  • the measurement regarding the test piece was performed by a dynamic viscoelasticity measuring device RSA-II (frequency: 1 Hz, heating rate: 3° C./min) manufactured by Rheometrics, and a storage elastic modulus E′ at 23° C. was obtained.
  • RSA-II frequency: 1 Hz, heating rate: 3° C./min
  • the storage elastic modulus G′ of the invention is a value obtained by setting the pressure-sensitive adhesive overlapped to a thickness of 2 mm as a test piece, mounting a parallel plate having a diameter of 7.9 mm on a viscoelasticity tester ARES 2kSTD manufactured by Rheometrics, inserting the test piece, and measuring at a frequency of 1 Hz.
  • a pressure-sensitive adhesive tape sample having a width of 20 mm at 23° C. was bonded to a stainless steel plate and pressurized by one reciprocating of 2 kg roller. The sample was left still at 23° C. for 1 hour and pulled in 180° C. direction at a tension rate of 300 mm/min by using a Tensilon tension tester, and adhesion was measured.
  • a clean and smooth stainless steel plate hairline polishing treatment by No. 360 waterproof abrasive paper
  • the pressure-sensitive adhesive tape cut to have a width of 20 mm and a length of 20 mm was bonded on a surface of a clean and smooth stainless steel plate 1 (hairline polishing treatment by No. 360 waterproof abrasive paper) in the atmosphere of 23° C. and 50% RH, so that the size of the bonding area becomes 20 mm ⁇ 20 mm, and the opposite surface thereof was bonded to a surface of a clean and smooth stainless steel plate 2 (hairline polishing treatment by No. 360 waterproof abrasive paper), so that the size of the bonding area becomes 20 mm ⁇ 20 mm, these were bonded by reciprocating the upper surface thereof with 5 kg roller, and left still in the environment of 23° C. for 24 hours, and accordingly, a test piece was produced.
  • a clean and smooth stainless steel plate 1 hairline polishing treatment by No. 360 waterproof abrasive paper
  • the stainless steel plate 2 was pulled in a shear direction of the pressure-sensitive adhesive tape at a rate of 300 mm/min by using a Tensilon tension tester, in the atmosphere of 23° C. and 50% RH, and shear adhesion was measured.
  • the pressure-sensitive adhesive tape cut to have a width of 20 mm and a length of 20 mm was bonded to on a surface of a clean and smooth stainless steel plate 1 (A1050) in the atmosphere of 23° C. and 50% RH, so that the size of the bonding area becomes 20 mm ⁇ 20 mm, and the opposite surface thereof was bonded to a surface of a clean and smooth stainless steel plate 2 (A1050), so that the size of the bonding area becomes 20 mm ⁇ 20 mm, these were bonded by reciprocating the upper surface thereof with 5 kg roller, and left still in the environment of 23° C. for 24 hours, and accordingly, a test piece was produced.
  • the stainless steel plate 2 was pulled in a crack direction of the pressure-sensitive adhesive tape at a rate of 300 mm/min by using a Tensilon tension tester, in the atmosphere of 23° C. and 50% RH, and crack adhesion was measured.
  • the pressure-sensitive adhesive tape having a width of 10 mm and a length of 60 mm was bonded to a clean and smooth stainless steel plate, in a state where a grab having a width of 10 mm and a length of 10 mm was pulled out, the opposite surface thereof was bonded to a clean and smooth stainless steel plate, and pressurized by reciprocating with a roller while applying a 2 kg load, and this was set as a test sample. After the bonding, the test sample was left still in the atmosphere of 23° C. and 50% RH for 3 days, and the grab portion of the pressure-sensitive adhesive tape was stretched by hand in a horizontal direction of the pressure-sensitive adhesive tape at a rate of approximately 300 mm/min, at 23° C. of 50% RH.
  • the pressure-sensitive adhesive tape could not be peeled off. Alternatively, the tape was cut twice or more.
  • the pressure-sensitive adhesive tape having a width of 20 mm and a length of 20 mm was bonded to a transparent acrylic plate having a width of 30 mm and a length of 30 mm, a transparent acrylic plate having a width of 30 mm and a length of 30 mm was bonded to the opposite surface of the pressure-sensitive adhesive tape, and this was set as a test piece. After the bonding, the test sample was left still in the atmosphere of 23° C. and 50% RH for 24 hours and visually observed through the acrylic plate, and a percentage of the area (bonding area) of the portion where the pressure-sensitive adhesive tape and the acrylic plate were bonded to each other, with respect to the area of the pressure-sensitive adhesive tape was evaluated.
  • A: Bonding area is 100% to 60% of the area of the pressure-sensitive adhesive tape.
  • Bonding area is 60% to 40% of the area of the pressure-sensitive adhesive tape.
  • Bonding area is 40% to 30% of the area of the pressure-sensitive adhesive tape.
  • Bonding area is less than 30% of the area of the pressure-sensitive adhesive tape.
  • Example 17 Base Composition Resin Resin material composition composition (1) (1) Thickness [ ⁇ m] 250 250 Elastic modulus E′[Pa] (23° C.) 2.16E+06 2.34E+06 Stress at 25% Elongation [MPa] 0.95 0.9 Stress at 50% Elongation [MPa] 1.15 1.12 Stress at Break (MD)[MPa] 16.62 14.7 Elongation at Break (MD)[%] 1500 1700 Pressure- Composition Pressure- Pressure- sensitive sensitive sensitive adhesive adhesive (1) adhesive (1) Elastic modulus G′(23° C.)[Pa] 2.70E+05 2.70E+05 Stress at 25% Elongation [MPa] 0.13 0.13 Stress at 50% Elongation [MPa] 0.15 0.15 Stress at Break (MD)[MPa] 2.65 2.65 Elongation at Break (MD)[%] 1300 1300 Thickness [ ⁇ m] 50 50 Tape Elastic modulus E′(23° C.)[Pa] 2.10E+06 2.10E+06 Thickness [ ⁇ m] 350 350 350

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
US16/621,014 2017-06-26 2018-06-14 Double-sided pressure-sensitive adhesive tape Abandoned US20200190370A1 (en)

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JP2018036498 2018-03-01
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PCT/JP2018/022687 WO2019003933A1 (ja) 2017-06-26 2018-06-14 両面粘着テープ

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EP4105289A1 (de) 2022-12-21
TW201906958A (zh) 2019-02-16
JP6750739B2 (ja) 2020-09-02
EP4105289A3 (de) 2023-05-03
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CN110741057A (zh) 2020-01-31
EP3647385A4 (de) 2021-07-14
JP2020152924A (ja) 2020-09-24
JPWO2019003933A1 (ja) 2020-04-02
US20220251426A1 (en) 2022-08-11
EP3647385A1 (de) 2020-05-06
WO2019003933A1 (ja) 2019-01-03
CN110741057B (zh) 2022-12-20

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