WO2015151223A1 - 両面粘着シート及び両面粘着シートの製造方法 - Google Patents
両面粘着シート及び両面粘着シートの製造方法 Download PDFInfo
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- WO2015151223A1 WO2015151223A1 PCT/JP2014/059603 JP2014059603W WO2015151223A1 WO 2015151223 A1 WO2015151223 A1 WO 2015151223A1 JP 2014059603 W JP2014059603 W JP 2014059603W WO 2015151223 A1 WO2015151223 A1 WO 2015151223A1
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- sensitive adhesive
- pressure
- adhesive layer
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- release sheet
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
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- 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
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- 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
- C08G18/625—Polymers of alpha-beta ethylenically unsaturated carboxylic acids; hydrolyzed polymers of esters of these acids
- C08G18/6254—Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
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- 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
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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- 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
- C08G18/8009—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203
- C08G18/8022—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203 with polyols having at least three hydroxy groups
- C08G18/8029—Masked aromatic polyisocyanates
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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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
- C09J7/30—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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
- C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner
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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
- 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
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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
- 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
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- 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
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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
- C09J2433/00—Presence of (meth)acrylic polymer
Definitions
- the present invention relates to a double-sided pressure-sensitive adhesive sheet and a method for producing a double-sided pressure-sensitive adhesive sheet.
- the double-sided pressure-sensitive adhesive sheet generally has a structure in which a laminate (adhesive laminate) in which a base material (core material) is interposed between two pressure-sensitive adhesive layers is sandwiched between two release sheets.
- a laminate adheresive laminate
- core material core material
- one of the two release sheets is a light release release sheet having a low release force
- the other is a heavy release release sheet having a high release force (see Patent Document 1).
- the light release-type release sheet is peeled off, the exposed pressure-sensitive adhesive layer is attached to the adherend, and then the heavy release-type release sheet is peeled off.
- the heavy release-type release sheet is peeled off.
- a double-sided pressure-sensitive adhesive sheet is sometimes used to laminate and bond each member, and a thin double-sided pressure-sensitive adhesive sheet having a pressure-sensitive adhesive laminate is desired with the above-mentioned thinning.
- the pressure-sensitive adhesive laminate of the double-sided pressure-sensitive adhesive sheet is thin, there is a problem that the above-mentioned floating is likely to occur.
- the release sheet may be replaced depending on the purpose of use.
- a release sheet of the double-sided pressure-sensitive adhesive sheet a release sheet subjected to a back cracking process (cut or half cut) for enabling split release may be used.
- the pressure-sensitive adhesive layer of the double-sided PSA sheet is thick, it can be back-cut by half-cutting while the release sheet is laminated on the double-sided PSA sheet. Since there exists a possibility of cutting a laminated body, it is necessary to replace a normal peeling sheet with the peeling sheet which gave the back crack process previously.
- the double-sided pressure-sensitive adhesive sheet usually protects one surface with a release sheet having a high peel strength and the other surface with a release sheet having a low peel strength. And when replacing with a release sheet that has been subjected to the back cracking process as described above, the release sheet on the side having the lower peeling force is peeled off and the release sheet that has been subjected to the back cracking process is laminated on the exposed adhesive surface. .
- the release sheet on the side that has not been subjected to the back crack process is first peeled off and applied to the adherend. Usage may be required.
- the release sheet on the side not subjected to back cracking is already a release sheet having a high release force. For this reason, if the release sheet with the back cracking process has a lower peeling force, it can be peeled only from the side of the release sheet with the back cracking process. Floating or peeling occurs at the interface between the release sheet subjected to cracking and the double-sided pressure-sensitive adhesive sheet. That is, in order to correspond to the above-described use mode, in the double-sided pressure-sensitive adhesive sheet, the release sheet subjected to the back cracking process needs to have a higher peeling force than the release sheet on the side not subjected to the back cracking process. There is.
- the present invention has been made in view of such circumstances, and is a double-sided pressure-sensitive adhesive sheet that has a thin adhesive laminate, is unlikely to float when the release sheet is peeled off, and has a degree of freedom in reattaching the release sheet. And it aims at providing the manufacturing method of the double-sided adhesive sheet.
- the present invention is laminated on a base material, a first pressure-sensitive adhesive layer laminated on one surface side of the base material, and the other surface side of the base material.
- a pressure-sensitive adhesive laminate including the second pressure-sensitive adhesive layer, a first release sheet laminated on the surface of the first pressure-sensitive adhesive layer opposite to the base, and the second pressure-sensitive adhesive.
- a double-sided pressure-sensitive adhesive sheet comprising a second release sheet laminated on the side of the layer opposite to the base material, wherein the base material has a thickness of 1 to 5 ⁇ m, and the first pressure-sensitive adhesive layer And the thickness of the second pressure-sensitive adhesive layer is 1 to 5 ⁇ m, respectively, and the peeling force of the first release sheet and the second release sheet is 10 to 30 mN / 25 mm. The difference between the peeling force and the peeling force of the second release sheet is 5 mN / 25 mm or less.
- An adhesive sheet is provided (Invention 1). In this specification, “sheet” includes the concept of a tape.
- the base material, the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer, the first release sheet, and the second release sheet are defined as described above.
- the pressure-sensitive adhesive laminate can be thinned.
- a floating that causes the pressure-sensitive adhesive laminate to be peeled off from the second release sheet may occur.
- the release force of the other release sheet may be at least higher than the release force of the first release sheet or the second release sheet, and may be suppressed lower than usual. Therefore, there is a degree of freedom in the replacement of the release sheet, and it can be replaced with various release sheets. Moreover, also when it replaces repeatedly, it can suppress that the peeling force of a peeling sheet becomes high too much, and can maintain the peelability of a peeling sheet favorably. Furthermore, since the difference in peel force is small as described above, there is no problem in workability regardless of which of the first release sheet and the second release sheet is removed first. There is no advantage.
- the first release sheet and the second release sheet are made of the same material (Invention 2).
- the first adhesive layer and the second adhesive layer are preferably made of the same adhesive (Invention 3).
- the adhesive forming the first adhesive layer and the second adhesive layer is an acrylic adhesive (Invention 4).
- the adhesive forming the first adhesive layer and the second adhesive layer contains a tackifier (Invention 5).
- the adhesive preferably contains a polymerized rosin ester and an aromatic petroleum resin as the tackifier (Invention 6).
- the present invention is a method for producing the above double-sided pressure-sensitive adhesive sheet (Invention 1 to 6), the step of forming a first pressure-sensitive adhesive layer on the release surface of the first release sheet; And laminating the first pressure-sensitive adhesive layer formed on the release surface of the release sheet on one surface side of the substrate, and forming a second pressure-sensitive adhesive layer on the release surface of the second release sheet And a step of laminating the second pressure-sensitive adhesive layer formed on the release surface of the second release sheet on the other surface side of the substrate.
- Invention 7 Provided (Invention 7)
- the double-sided pressure-sensitive adhesive sheet of the present invention has a thin pressure-sensitive adhesive laminate, is less likely to float when any release sheet is peeled off, and has a degree of freedom in re-attaching the release sheet.
- Various release sheets can be attached.
- the above double-sided adhesive sheets can be manufactured easily.
- FIG. 1 is a cross-sectional view of a double-sided pressure-sensitive adhesive sheet according to the present embodiment.
- FIG. 1 shows a cross-sectional view of a double-sided PSA sheet 1 according to this embodiment.
- the double-sided pressure-sensitive adhesive sheet 1 according to an embodiment of the present invention includes a base material 20 and a first pressure-sensitive adhesive layer 21 provided on one surface (upper side in FIG. 1) of the base material 20.
- the second pressure-sensitive adhesive layer 22 provided on the other surface (lower side in FIG. 1) of the base material 20 and the surface of the first pressure-sensitive adhesive layer 21 opposite to the base material 20 (in FIG. 1).
- the thickness of the base material 20 in the double-sided pressure-sensitive adhesive sheet 1 according to this embodiment is 1 to 5 ⁇ m, and the thickness of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 is 1 to 5 ⁇ m, respectively.
- the thickness of each layer is in the above range, the pressure-sensitive adhesive laminate 2 can be thinned, the interval between two adherends bonded by the pressure-sensitive adhesive laminate 2 can be narrowed, and the resulting product is thin. Can contribute.
- the peel force of the first release sheet 31 and the second release sheet 32 in the double-sided pressure-sensitive adhesive sheet 1 according to the present embodiment is 10 to 30 mN / 25 mm, preferably 15 to 30 mN / 25 mm, In particular, it is preferably 20 to 30 mN / 25 mm.
- both the peeling force of the first release sheet 31 and the second release sheet 32 are as low as 30 mN / 25 mm or less, when the release sheet 31 (or 32) is peeled, the other side is peeled off. It is possible to effectively prevent floating and peeling at the interface between the sheet 32 (or 31) and the pressure-sensitive adhesive layer.
- the release force of the other release sheet is at least the first release sheet 31 or the second release sheet. What is necessary is just to make it higher than the peeling force of the sheet
- the 1st peeling sheet 31 and the 2nd peeling sheet 32 are in process, conveyance, etc. by the peeling force of the 1st peeling sheet 31 and the 2nd peeling sheet 32 being 10 mN / 25mm or more.
- the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 can be in close contact with each other to protect them.
- the difference (absolute value) between the peel force of the first release sheet 31 and the peel force of the second release sheet 32 in the double-sided pressure-sensitive adhesive sheet 1 according to this embodiment is 5 mN / 25 mm or less, and is 4 mN / 25 mm or less. In particular, it is preferably 2 mN / 25 mm or less.
- the difference in peel force between the first release sheet 31 and the second release sheet 32 is as small as 5 mN / 25 mm or less.
- the difference in peeling force is small as described above, there is no problem in workability regardless of which of the first peeling sheet 31 and the second peeling sheet 32 is peeled first, and therefore the peeling order is distinguished. There is an advantage that it is not necessary.
- the difference of the said peeling force is an absolute value, and either the peeling force of the 1st peeling sheet 31 and the peeling force of the 2nd peeling sheet 32 may be large or small.
- the measuring method of the said peeling force is as showing to the test example mentioned later.
- the base material 20 of the double-sided pressure-sensitive adhesive sheet 1 supports the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 and gives a predetermined rigidity to the pressure-sensitive adhesive laminate 2.
- the rigidity of the pressure-sensitive adhesive laminate 2 as a whole is increased, and when this occurs, one of the release sheets is peeled off at the interface between the other release sheet and the pressure-sensitive adhesive layer. It is possible to effectively prevent floating and peeling.
- the thickness of the substrate 20 is 1 to 5 ⁇ m, preferably 1 to 4 ⁇ m, and particularly preferably 1 to 2 ⁇ m.
- the thickness of the base material 20 exceeds 5 ⁇ m, the thinness required for the pressure-sensitive adhesive laminate 2 cannot be obtained.
- the function as a base material of the adhesion laminated body 2 cannot fully be performed as the thickness of the base material 20 is less than 1 micrometer.
- the substrate 20 is not particularly limited as long as it satisfies the above thickness and can laminate the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22.
- Examples of the base material 20 include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyolefin films such as polyethylene film and polypropylene film, cellulose films such as triacetyl cellulose, polyvinyl chloride films, and polyvinylidene chloride.
- polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate
- polyolefin films such as polyethylene film and polypropylene film
- cellulose films such as triacetyl cellulose
- polyvinyl chloride films polyvinylidene chloride
- a plastic film that can be easily thinned and has high smoothness is preferable, among which polyolefin film and polyester excellent in mechanical strength and economy are preferable, and polyethylene terephthalate film is particularly preferable.
- a surface treatment by an oxidation method, a roughening method or the like, or a primer for the purpose of improving the adhesion between the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 provided on the surface thereof.
- Processing can be performed.
- the oxidation method include corona discharge treatment, plasma discharge treatment, chromium oxidation treatment (wet), flame treatment, hot air treatment, ozone, ultraviolet irradiation treatment, and the like.
- Examples include a thermal spraying method.
- These surface treatment methods are appropriately selected according to the type of the resin film, but generally, a corona discharge treatment method is preferably used from the viewpoints of effects and operability.
- the thicknesses of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 in the double-sided pressure-sensitive adhesive sheet 1 according to this embodiment are as described above. 1 to 5 ⁇ m, preferably 1 to 4 ⁇ m, and particularly preferably 1.5 to 2.5 ⁇ m.
- the thickness of the 1st adhesive layer 21 or the 2nd adhesive layer 22 exceeds 5 micrometers, the thinness required about the adhesion laminated body 2 is not obtained.
- the thickness of the 1st adhesive layer 21 or the 2nd adhesive layer 22 is less than 1 micrometer, adhesive force will become low too much and the function as an adhesive cannot be exhibited stably.
- the pressure-sensitive adhesive forming the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 is not particularly limited as long as it exhibits a desired pressure-sensitive adhesive force with the above thickness.
- Such an adhesive may be, for example, an acrylic adhesive, a silicone adhesive, a polyester adhesive, a polyurethane adhesive, a rubber adhesive, or the like.
- the pressure-sensitive adhesive may be any of an emulsion type, a solvent type, or a solventless type, and may be a crosslinked type or a non-crosslinked type.
- an acrylic pressure-sensitive adhesive excellent in adhesiveness and handling property in a thin film is preferable.
- acrylic pressure-sensitive adhesive those containing a (meth) acrylic acid ester polymer (A) are preferable, and the (meth) acrylic acid ester polymer (A) is further crosslinked by a crosslinking agent (B). It is preferable to contain.
- (meth) acrylic acid ester means both acrylic acid ester and methacrylic acid ester. The same applies to other similar terms.
- the “polymer” includes the concept of “copolymer”.
- the (meth) acrylic acid ester polymer (A) preferably contains a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as a monomer constituting the polymer. Thereby, the obtained adhesive can express preferable adhesiveness.
- the (meth) acrylic acid ester polymer (A) is a monomer having a functional group that reacts with a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms and a crosslinking agent (B) (reactive property). Particularly preferred is a copolymer of a functional group-containing monomer) and other monomers used as desired.
- Examples of (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and n- (meth) acrylate.
- examples thereof include n-dodecyl, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like.
- (meth) acrylic acid esters having an alkyl group having 1 to 8 carbon atoms are preferred, and n-butyl (meth) acrylate is particularly preferred.
- these may be used independently and may be used in combination of 2 or more type.
- the (meth) acrylic acid ester polymer (A) contains 60 to 100% by mass of a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as a monomer unit constituting the polymer. It is particularly preferably 70 to 98% by mass, more preferably 80 to 96% by mass.
- a monomer having a hydroxyl group in the molecule hydroxyl group-containing monomer
- a monomer having a carboxyl group in the molecule carboxyl group in the molecule
- a monomer having an amino group in the molecule amino group-containing monomer
- hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, (meth And (meth) acrylic acid hydroxyalkyl esters such as 3-hydroxybutyl acrylate and 4-hydroxybutyl (meth) acrylate.
- 2-hydroxyethyl (meth) acrylate is preferable from the viewpoint of the reactivity of the hydroxyl group in the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (B) and the copolymerizability with other monomers. Is preferred. These may be used alone or in combination of two or more.
- carboxyl group-containing monomer examples include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.
- carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.
- acrylic acid is preferable from the viewpoint of the reactivity of the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (B) of the carboxyl group and the copolymerizability with other monomers. These may be used alone or in combination of two or more.
- amino group-containing monomer examples include aminoethyl (meth) acrylate, n-butylaminoethyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.
- the (meth) acrylic acid ester polymer (A) preferably contains 0 to 25% by mass of a reactive functional group-containing monomer as the monomer unit constituting the polymer, particularly 0.1 to 10% by mass. It is preferable to contain 0.3 to 5% by mass.
- Examples of the other monomer include aliphatic rings such as (meth) acrylic acid alkoxyalkyl esters such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, and cyclohexyl (meth) acrylate (meth)
- Non-crosslinkable acrylamide such as acrylic ester, acrylamide, methacrylamide, etc.
- Non-crosslinkable tertiary such as N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate
- examples thereof include (meth) acrylic acid ester having an amino group, vinyl acetate, and styrene.
- the (meth) acrylic acid ester polymer (A) contains vinyl acetate as a monomer unit constituting the polymer, it preferably contains 0 to 10% by mass of vinyl acetate, particularly 0.1 to 8% by mass. %, Preferably 1 to 5% by mass.
- the polymerization mode of the (meth) acrylic acid ester polymer (A) may be a random copolymer or a block copolymer.
- the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 200,000 to 3,000,000, particularly preferably 400,000 to 2,000,000, and more preferably 600,000 to 1,200,000. preferable.
- the weight average molecular weight in this specification is the value of polystyrene conversion measured by the gel permeation chromatography (GPC) method.
- (meth) acrylic acid ester polymer (A) may be used individually by 1 type, and may be used in combination of 2 or more type.
- the crosslinking agent (B) may be any one that reacts with the reactive functional group of the (meth) acrylic acid ester polymer (A).
- an isocyanate crosslinking agent for example, an isocyanate crosslinking agent, an epoxy crosslinking agent, and an amine crosslinking agent.
- Melamine crosslinking agent aziridine crosslinking agent, hydrazine crosslinking agent, aldehyde crosslinking agent, oxazoline crosslinking agent, metal alkoxide crosslinking agent, metal chelate crosslinking agent, metal salt crosslinking agent, ammonium salt crosslinking agent, etc. Is mentioned.
- the reactive functional group of the (meth) acrylic acid ester polymer (A) is a hydroxyl group
- an isocyanate-based crosslinking agent that is excellent in reactivity with the hydroxyl group
- (meth) acrylic acid when the reactive functional group which the ester polymer (A) has is a carboxyl group, it is preferable to use an epoxy-based crosslinking agent having excellent reactivity with the carboxyl group.
- a crosslinking agent (B) can be used individually by 1 type or in combination of 2 or more types.
- the isocyanate-based crosslinking agent contains at least a polyisocyanate compound.
- the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate, etc.
- biuret bodies, isocyanurate bodies, and adduct bodies that are a reaction product with low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.
- low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.
- trimethylolpropane-modified aromatic polyisocyanate particularly trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate are preferable from the viewpoint of reactivity with hydroxyl groups.
- epoxy-based crosslinking agent examples include 1,3-bis (N, N′-diglycidylaminomethyl) cyclohexane, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine, ethylene glycol diglycidyl.
- examples include ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, diglycidyl amine and the like.
- the amount of the crosslinking agent (B) used is preferably 0.1 to 10 parts by weight, particularly 0.3 to 5 parts by weight, based on 100 parts by weight of the (meth) acrylic acid ester polymer (A). It is preferable that the amount is 0.3 to 3 parts by mass.
- a tackifier may be added to the pressure-sensitive adhesive that forms the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22.
- the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 of the thin film can easily exhibit a desired pressure-sensitive adhesive force.
- the tackifier is not particularly limited.
- examples thereof include indene resins, aliphatic petroleum resins, aromatic petroleum resins and their hydrides, aliphatic / aromatic copolymer petroleum resins, and low molecular mass coalesces of styrene or substituted styrene. These may be used individually by 1 type and may be used in combination of 2 or more type.
- the content of the tackifier is preferably 2 with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A) from the viewpoint of achieving both high adhesive strength and low peeling strength. Is 90 parts by mass, more preferably 15-70 parts by mass.
- polymerized rosin ester and rosin resin excluding aromatic modified terpene resin, terpene phenol resin, aliphatic petroleum resin, aromatic petroleum resin, aliphatic / aromatic copolymer petroleum resin, and polymerized rosin ester It is preferable to use a combination with at least one selected, and it is particularly preferable to use a combination of a polymerized rosin ester and an aromatic petroleum resin. Thereby, the characteristic outstanding in both surfaces, such as adhesive force and curved surface sticking property, can be exhibited.
- the polymerized rosin ester is preferably added in an amount of 1 to 50 parts by mass, more preferably 10 to 40 parts by mass with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A).
- the aromatic petroleum resin is preferably added in an amount of 1 to 40 parts by mass, more preferably 5 to 30 parts by mass with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A).
- the pressure-sensitive adhesive forming the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 may contain other components.
- examples of such components include additives such as antistatic agents, antioxidants, ultraviolet absorbers, light stabilizers, softeners, silane coupling agents, and fillers.
- the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 may be formed from different pressure-sensitive adhesives, but are preferably formed from the same pressure-sensitive adhesive.
- the difference between the peeling force of the first peeling sheet 31 and the peeling force of the second peeling sheet 32 is determined.
- the release force of the first release sheet 31 and the release force of the second release sheet 32 can be reduced. The difference with can be eliminated.
- the adhesive force of the 1st adhesive layer 21 and the adhesive force of the 2nd adhesive layer 22 can be made easy to be the same, and when using the double-sided adhesive sheet 1, the 1st adhesive layer 21 and the 2nd There is no need to use the adhesive layer 22 separately.
- the adhesive strength of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 to a stainless steel plate (# 360 polished surface) in accordance with JIS Z0237: 2009 is preferably 2000 to 30000 mN / 25 mm, respectively. It is preferably 3000 to 20000 mN / 25 mm, and more preferably 5000 to 15000 mN / 25 mm. Moreover, it is preferable that the adhesive force of the 1st adhesive layer 21 and the adhesive force of the 2nd adhesive layer 22 are the same.
- the first release sheet 31 is formed so that the release surface is in contact with the first pressure-sensitive adhesive layer 21.
- the second release sheet 32 is laminated with the second pressure-sensitive adhesive layer 22 so that the release surface is in contact with the second pressure-sensitive adhesive layer 22.
- the release surface of the release sheet in this specification refers to a surface having peelability in the release sheet, and includes both a surface that has been subjected to a release treatment and a surface that exhibits peelability without being subjected to a release treatment. .
- the first release sheet 31 and the second release sheet 32 in the double-sided pressure-sensitive adhesive sheet 1 according to the present embodiment are not particularly limited as long as they have the aforementioned peeling force and peeling force difference.
- first release sheet 31 and the second release sheet 32 examples include a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, a vinyl chloride copolymer film, and a polyethylene terephthalate.
- the release surface of the first release sheet 31 and the second release sheet 32 is preferably subjected to a release treatment.
- the release agent used for the release treatment include silicone-based, fluorine-based, alkyd-based, unsaturated polyester-based, polyolefin-based, and wax-based release agents.
- a silicone type release agent is preferable among the above. According to the silicone release agent, the first release sheet 31 and the second release sheet 32 are likely to have the above-described peeling force and peeling force difference.
- silicone release agent examples include a first organopolysiloxane having at least two alkenyl groups (for example, a vinyl group) in one molecule and a second organopolysiloxane having at least two hydrosilyl groups in one molecule.
- Those containing an addition reaction type silicone resin obtained from siloxane (corresponding to a crosslinking agent) and a silicone resin can be preferably used.
- the silicone resin for example, an MQ resin composed of an M unit which is a monofunctional siloxane unit [(CH 3 ) 3 SiO 1/2 ] and a Q unit which is a tetrafunctional siloxane unit [SiO 4/2 ] is used.
- the desired release force can be obtained by adjusting the hardness of the release agent layer by the skeleton of the addition reaction type silicone resin and adjusting the surface polarity by the blending amount of the silicone resin. Can do.
- the thickness of the first release sheet 31 and the second release sheet 32 is not particularly limited, but is preferably a thickness corresponding to the thin film adhesive laminate 2, preferably 12 to 100 ⁇ m, In particular, the thickness is preferably 20 to 75 ⁇ m, and more preferably 25 to 38 ⁇ m.
- the first release sheet 31 and the second release sheet 32 may be made of different materials, but are preferably made of the same material.
- the difference between the release force of the first release sheet 31 and the release force of the second release sheet 32 can be easily reduced.
- the peeling force of the first peeling sheet 31 and the peeling force of the second peeling sheet 32 Can eliminate the difference.
- the double-sided pressure-sensitive adhesive sheet 1 according to the present embodiment can be produced by a conventional method, but in order to control the adhesive force of the first adhesive layer 21 and the adhesive force of the second adhesive layer 22, the following It is preferable to manufacture by a method.
- the first pressure-sensitive adhesive layer 21 is formed on the release surface of the first release sheet 31, and the formed first pressure-sensitive adhesive layer 21 is laminated (transferred) on one surface of the substrate 20. Further, the second pressure-sensitive adhesive layer 22 is formed on the release surface of the second release sheet 32, and the formed second pressure-sensitive adhesive layer 22 is laminated (transferred) on the other surface of the substrate 20.
- the first pressure-sensitive adhesive layer 21 is a roll coater, knife coater, roll knife coater, air knife coater, which is prepared by preparing a coating agent containing the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer 21 and, if desired, a solvent. It can be formed by applying to the release surface of the first release sheet 31 with a coating machine such as a die coater, bar coater, gravure coater or curtain coater and drying. Similarly, the second pressure-sensitive adhesive layer 22 can be formed by applying to the release surface of the second release sheet 32 and drying.
- the second pressure-sensitive adhesive layer 22 was directly formed on the other surface of the substrate 20.
- the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer 22 is applied to the other surface of the substrate 20 and dried, the first pressure-sensitive adhesive layer formed on one surface of the substrate 20 is applied to the first pressure-sensitive adhesive layer. Also, heat was applied, whereby the adhesive strength of the first adhesive layer was reduced.
- the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 are formed separately, so that the first problem does not occur with the above-described problem of lowering the pressure-sensitive adhesive force.
- the adhesive force of the adhesive layer 21 and the adhesive force of the second adhesive layer 22 can be controlled. That is, when the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer 21 and the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer 22 are the same, the pressure-sensitive adhesive force of the first pressure-sensitive adhesive layer 21 and the pressure-sensitive adhesive The adhesive strength of the two adhesive layers 22 can be made the same.
- the first pressure-sensitive adhesive layer 21 is first laminated on the base material 20 and the second pressure-sensitive adhesive layer 22 is laminated on the base material 20 later.
- Two pressure-sensitive adhesive layers 22 may be laminated on the base material 20, and the first pressure-sensitive adhesive layer 21 may be laminated on the base material 20 later.
- the double-sided pressure-sensitive adhesive sheet 1 can be used for joining various members, and can be suitably used for joining members in products that are particularly required to be thin.
- joining of members in various electronic devices such as a mobile phone, a portable information terminal, a smartphone, a tablet terminal, a notebook personal computer, an electronic dictionary, a digital music player, a digital video player, a portable game device, a portable GPS terminal, and a camera can be used.
- the member to be joined include a substrate, various electronic components, a heat radiation sheet, an electromagnetic wave shielding sheet, and a gas barrier sheet.
- another layer may be provided between the base material 20 and the first pressure-sensitive adhesive layer 21 and / or the second pressure-sensitive adhesive layer 22 in the double-sided pressure-sensitive adhesive sheet 1.
- Example 1 Preparation of (meth) acrylic acid ester polymer 97 parts by weight of n-butyl acrylate, 1 part by weight of acrylic acid, 0.5 part by weight of 2-hydroxyethyl acrylate, and 3 parts by weight of vinyl acetate were copolymerized, A (meth) acrylic acid ester polymer was prepared. When the molecular weight of this (meth) acrylic acid ester polymer was measured by the method described later, the weight average molecular weight (Mw) was 1,000,000.
- pressure-sensitive adhesive 100 parts by mass of the (meth) acrylic acid ester polymer obtained in Step 1 above (converted to solid content; the same applies hereinafter) and trimethylolpropane-modified tolylene diisocyanate (manufactured by Nippon Polyurethane Co., Ltd.) , Trade name "Coronate L”) 1 part by mass, polymerized rosin ester as a tackifier (manufactured by Harima Kasei Co., Ltd., trade name "Halitak FK100”), and aromatic petroleum resin (Mitsui) as a tackifier Chemical Co., Ltd., trade name “FTR6100”) was mixed with 20 parts by mass, sufficiently stirred, and diluted with methyl ethyl ketone to obtain a pressure-sensitive adhesive coating solution (solid content: 10% by mass).
- first adhesive layer As a first release sheet, a release sheet (SP-PET1130, manufactured by Lintec Corporation, thickness: 25 ⁇ m) obtained by releasing one side of a polyethylene terephthalate (PET) film with a silicone release agent is used. Prepared. The pressure-sensitive adhesive coating solution obtained in step 2 above is applied to the release-treated surface of the first release sheet with a knife coater so that the thickness after drying is 2 ⁇ m, and then heated at 90 ° C. for 1 minute. It processed and formed the 1st adhesive layer.
- SP-PET1130 manufactured by Lintec Corporation, thickness: 25 ⁇ m
- PET polyethylene terephthalate
- the formed first pressure-sensitive adhesive layer is laminated on one surface of a PET film (made by Mitsubishi Plastics, trade name “Diafoil K100-2.0W”, thickness: 2 ⁇ m) as a base material. (Transfer) to obtain a laminate composed of the first release sheet / first pressure-sensitive adhesive layer / base material.
- a PET film made by Mitsubishi Plastics, trade name “Diafoil K100-2.0W”, thickness: 2 ⁇ m
- Double-sided Adhesive Sheet As a second release sheet, a release sheet (SP-PET1130, thickness: 25 ⁇ m) prepared by releasing one side of a PET film with a silicone release agent was prepared. The pressure-sensitive adhesive coating solution obtained in step 2 above is applied to the release-treated surface of the second release sheet with a knife coater so that the thickness after drying is 2 ⁇ m, and then heated at 90 ° C. for 1 minute. A second pressure-sensitive adhesive layer was formed by processing.
- the formed second pressure-sensitive adhesive layer is laminated and transferred (transferred) to the other surface (exposed surface) of the base material in the laminate obtained in the above step 3, and the first release sheet / first A double-sided PSA sheet consisting of 1 PSA layer / base material / second PSA layer / second release sheet was obtained.
- Example 2 The pressure-sensitive adhesive coating solution obtained in Step 2 of Example 1 is dried on the other surface (exposed surface) of the base material in the laminate obtained in Step 3 of Example 1 so that the thickness after drying becomes 2 ⁇ m.
- coating with a knife coater it heat-processed at 90 degreeC for 1 minute, and formed the 2nd adhesive layer.
- the second release sheet that is the same as that of Example 1 is bonded to the formed second pressure-sensitive adhesive layer so that the release-treated surface is in contact with the second pressure-sensitive adhesive layer. And laminated to obtain a double-sided pressure-sensitive adhesive sheet comprising the first release sheet / first pressure-sensitive adhesive layer / base material / second pressure-sensitive adhesive layer / second release sheet.
- Example 1 is used except that a release sheet (SP-PET1031, thickness: 25 ⁇ m, manufactured by Lintec Corporation) in which one side of a PET film is release-treated with a silicone-based release agent is used as the first release sheet and the second release sheet. Similarly, a double-sided PSA sheet was produced.
- SP-PET1031, thickness: 25 ⁇ m, manufactured by Lintec Corporation a release sheet in which one side of a PET film is release-treated with a silicone-based release agent is used as the first release sheet and the second release sheet.
- a double-sided PSA sheet was produced.
- Example 2 As the first release sheet, a double-sided pressure-sensitive adhesive sheet was used in the same manner as in Example 1 except that a release sheet (SP-PET1031, thickness: 25 ⁇ m) obtained by releasing one side of a PET film with a silicone release agent was used. was made.
- the above-mentioned weight average molecular weight (Mw) is a polystyrene-reduced weight average molecular weight measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).
- GPC measurement device manufactured by Tosoh Corporation, HLC-8020 GPC column (passed in the following order): TSK guard column HXL-H manufactured by Tosoh Corporation TSK gel GMHXL ( ⁇ 2) TSK gel G2000HXL ⁇ Measurement solvent: Tetrahydrofuran ⁇ Measurement temperature: 40 ° C.
- the double-sided pressure-sensitive adhesive sheets obtained in Examples 1 and 2 had the same peeling force even when the release sheet was peeled from any of them, and no lifting occurred. . Moreover, in the double-sided adhesive sheet obtained in Example 1, the 1st adhesive layer and the 2nd adhesive layer showed the same adhesive force.
- the double-sided pressure-sensitive adhesive sheet according to the present invention is suitable for manufacturing, for example, portable electronic devices that are required to be thin, such as smartphones and tablet terminals. Moreover, the manufacturing method of the double-sided adhesive sheet which concerns on this invention is suitable for manufacturing such a double-sided adhesive sheet.
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Abstract
Description
〔両面粘着シート〕
図1は、本実施形態に係る両面粘着シート1の断面図を示したものである。
本発明の一実施形態に係る両面粘着シート1は、図1に示すように、基材20と、基材20の一方の面(図1では上側)に設けられた第1の粘着剤層21と、基材20の他方の面(図1では下側)に設けられた第2の粘着剤層22と、第1の粘着剤層21の基材20とは反対側の面(図1では上側)に設けられた第1の剥離シート31と、第2の粘着剤層22の基材20とは反対側の面(図1では下側)に設けられた第2の剥離シート32とから構成される。なお、第1の粘着剤層21、基材20及び第2の粘着剤層22の積層体を、粘着積層体2という。
本実施形態に係る両面粘着シート1の基材20は、第1の粘着剤層21及び第2の粘着剤層22を支持し、粘着積層体2に所定の剛性を与える機能を有する。すなわち、両面粘着シート1が基材20を有することにより、粘着積層体2全体としての剛性が増し、これにより片方の剥離シートを剥がす際、もう一方の剥離シートと粘着剤層との界面で発生する浮きや剥がれを有効に防止することができる。
本実施形態に係る両面粘着シート1における第1の粘着剤層21及び第2の粘着剤層22の厚みは、前述した通り、それぞれ1~5μmであり、1~4μmであることが好ましく、特に1.5~2.5μmであることが好ましい。第1の粘着剤層21又は第2の粘着剤層22の厚さが5μmを超えると、粘着積層体2について必要とされる薄さが得られない。また、第1の粘着剤層21又は第2の粘着剤層22の厚さが1μm未満であると、粘着力が低くなりすぎて、粘着剤としての機能を安定して発揮することができない。
本実施形態に係る両面粘着シート1において、第1の剥離シート31は、その剥離面が第1の粘着剤層21に接触するように第1の粘着剤層21と積層されており、第2の剥離シート32は、その剥離面が第2の粘着剤層22に接触するように第2の粘着剤層22と積層されている。なお、本明細書における剥離シートの剥離面とは、剥離シートにおいて剥離性を有する面をいい、剥離処理を施した面および剥離処理を施さなくても剥離性を示す面のいずれをも含むものである。
本実施形態に係る両面粘着シート1は、常法によって製造することができるが、第1の粘着剤層21の粘着力及び第2の粘着剤層22の粘着力を制御するには、以下の方法によって製造することが好ましい。
本実施形態に係る両面粘着シート1は、種々の部材の接合に用いることができ、特に薄型化が要求されている製品における部材同士の接合に好適に用いることができる。例えば、携帯電話、携帯情報端末、スマートフォン、タブレット端末、ノート型パーソナルコンピュータ、電子辞書、デジタル音楽プレイヤー、デジタル動画プレイヤー、携帯ゲーム機器、携帯型GPS端末、カメラ等の各種電子機器における部材同士の接合に用いることができる。接合対象としての部材としては、例えば、基板、各種電子部品、放熱シート、電磁波遮蔽シート、ガスバリアシート等が挙げられる。
1.(メタ)アクリル酸エステル重合体の調製
アクリル酸n-ブチル97質量部、アクリル酸1質量部、アクリル酸2-ヒドロキシエチル0.5質量部、及び酢酸ビニル3質量部を共重合させて、(メタ)アクリル酸エステル重合体を調製した。この(メタ)アクリル酸エステル重合体の分子量を後述する方法で測定したところ、重量平均分子量(Mw)100万であった。
上記の工程1で得られた(メタ)アクリル酸エステル重合体100質量部(固形分換算値;以下同じ)と、架橋剤としてのトリメチロールプロパン変性トリレンジイソシアネート(日本ポリウレタン社製,商品名「コロネートL」)1質量部と、粘着付与剤としての重合ロジンエステル(ハリマ化成社製,商品名「ハリタックFK100」)30質量部と、粘着付与剤としての芳香族石油樹脂(三井化学社製,商品名「FTR6100」)20質量部とを混合し、十分に撹拌し、メチルエチルケトンで希釈することにより、粘着剤の塗布溶液(固形分10質量%)を得た。
第1の剥離シートとして、ポリエチレンテレフタレート(PET)フィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP-PET1130,厚み:25μm)を用意した。上記の工程2で得られた粘着剤の塗布液を、上記第1の剥離シートの剥離処理面に、乾燥後の厚みが2μmになるようにナイフコーターで塗布したのち、90℃で1分間加熱処理して第1の粘着剤層を形成した。
第2の剥離シートとして、PETフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP-PET1130,厚み:25μm)を用意した。上記の工程2で得られた粘着剤の塗布液を、上記第2の剥離シートの剥離処理面に、乾燥後の厚みが2μmになるようにナイフコーターで塗布したのち、90℃で1分間加熱処理して第2の粘着剤層を形成した。
実施例1の工程2で得られた粘着剤の塗布液を、実施例1の工程3で得られた積層体における基材の他方の面(露出面)に、乾燥後の厚みが2μmになるようにナイフコーターで塗布したのち、90℃で1分間加熱処理して第2の粘着剤層を形成した。
第1の剥離シート及び第2の剥離シートとして、PETフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP-PET1031,厚み:25μm)を使用する以外、実施例1と同様にして両面粘着シートを作製した。
第1の剥離シートとして、PETフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP-PET1031,厚み:25μm)を使用する以外、実施例1と同様にして両面粘着シートを作製した。
<測定条件>
・GPC測定装置:東ソー社製,HLC-8020
・GPCカラム(以下の順に通過):東ソー社製
TSK guard column HXL-H
TSK gel GMHXL(×2)
TSK gel G2000HXL
・測定溶媒:テトラヒドロフラン
・測定温度:40℃
実施例及び比較例で得られた両面粘着シートを125mm×25mmに裁断し、23℃、50%RHの環境下で、上記両面粘着シートから第2の剥離シートを剥離し、露出した第2の粘着剤層を、PETフィルム(東レ社製,商品名「ルミラーT-61M」,厚み:25μm)に貼付した。そして、得られた積層体のPETフィルム側を、ステンレススチール板に固定した。
実施例及び比較例で得られた両面粘着シートにおいて、第1の剥離シートと第1の粘着剤層との間に剥離の起点部分を作り、第1の剥離シートを第1の粘着剤層から剥離した。このとき、粘着剤層(第2の粘着剤層)と第2の剥離シートとの間で浮きが発生するかどうか、目視にて確認した。その結果、浮きが無かったものを○、浮きがあったものを×と評価した。
実施例及び比較例で得られた両面粘着シートを250mm×25mmに裁断し、23℃、50%RHの環境下で、上記両面粘着シートから第2の剥離シートを剥離し、露出した第2の粘着剤層を、PETフィルム(東レ社製,商品名「ルミラーT-61M」,厚み:25μm)に貼付した。次いで、上記両面粘着シートから第1の剥離シートを剥離し、露出した第1の粘着剤層を、ステンレススチール板(#360研磨面)に貼付した。
2…粘着積層体
20…基材
21…第1の粘着剤層
22…第2の粘着剤層
31…第1の剥離シート
32…第2の剥離シート
Claims (7)
- 基材と、前記基材の一方の面側に積層された第1の粘着剤層と、前記基材の他方の面側に積層された第2の粘着剤層とを備えた粘着積層体と、
前記第1の粘着剤層における前記基材とは反対の面側に積層された第1の剥離シートと、
前記第2の粘着剤層における前記基材とは反対の面側に積層された第2の剥離シートと
を備えた両面粘着シートであって、
前記基材の厚みは1~5μmであり、
前記第1の粘着剤層及び前記第2の粘着剤層の厚みはそれぞれ1~5μmであり、
前記第1の剥離シート及び前記第2の剥離シートの剥離力は10~30mN/25mmであり、
前記第1の剥離シートの剥離力と前記第2の剥離シートの剥離力との差は5mN/25mm以下である
ことを特徴とする両面粘着シート。 - 前記第1の剥離シート及び前記第2の剥離シートは同一の材料からなることを特徴とする請求項1に記載の両面粘着シート。
- 前記第1の粘着剤層及び前記第2の粘着剤層は同一の粘着剤からなることを特徴とする請求項1又は2に記載の両面粘着シート。
- 前記第1の粘着剤層及び前記第2の粘着剤層を形成する粘着剤はアクリル系粘着剤であることを特徴とする請求項1~3のいずれか一項に記載の両面粘着シート。
- 前記第1の粘着剤層及び前記第2の粘着剤層を形成する粘着剤は粘着付与剤を含有することを特徴とする請求項1~4のいずれか一項に記載の両面粘着シート。
- 前記粘着剤は、前記粘着付与剤として重合ロジンエステル及び芳香族石油樹脂を含有することを特徴とする請求項5に記載の両面粘着シート。
- 請求項1~6のいずれか一項に記載の両面粘着シートを製造する方法であって、
前記第1の剥離シートの剥離面に第1の粘着剤層を形成する工程と、
前記第1の剥離シートの剥離面に形成された前記第1の粘着剤層を前記基材の一方の面側に積層する工程と、
前記第2の剥離シートの剥離面に第2の粘着剤層を形成する工程と、
前記第2の剥離シートの剥離面に形成された前記第2の粘着剤層を前記基材の他方の面側に積層する工程と
を備えたことを特徴とする両面粘着シートの製造方法。
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JP2018158960A (ja) * | 2017-03-22 | 2018-10-11 | 荒川化学工業株式会社 | 粘着付与樹脂エマルジョン及び水系粘・接着剤組成物 |
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