WO2017022749A1 - Adhesive tape, heat-dissipating sheet, electronic apparatus, and method of manufacturing adhesive tape - Google Patents
Adhesive tape, heat-dissipating sheet, electronic apparatus, and method of manufacturing adhesive tape Download PDFInfo
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- WO2017022749A1 WO2017022749A1 PCT/JP2016/072622 JP2016072622W WO2017022749A1 WO 2017022749 A1 WO2017022749 A1 WO 2017022749A1 JP 2016072622 W JP2016072622 W JP 2016072622W WO 2017022749 A1 WO2017022749 A1 WO 2017022749A1
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- Prior art keywords
- pressure
- adhesive tape
- adhesive
- sensitive adhesive
- parts
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
- H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
- H05K7/20472—Sheet interfaces
- H05K7/20481—Sheet interfaces characterised by the material composition exhibiting specific thermal properties
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/204—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive coating being discontinuous
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
Definitions
- the present invention relates to a thin adhesive tape that can be used, for example, in the production scene of electronic devices and the like.
- Adhesive tapes are widely used in the production scenes of electronic devices such as OA equipment and home appliances because they are excellent in workability and have high adhesion reliability.
- the electronic devices have been required to have high functionality, downsizing, and thinning, and in particular, portable electronic devices such as personal computers, digital video cameras, electronic notebooks, mobile phones, PHSs, smartphones, game devices, electronic books, and the like. Terminals are required to be further reduced in size and thickness. Accordingly, the adhesive tape and the like constituting the portable electronic terminal are also required to be thin.
- an acrylic acid ester copolymer having a weight average molecular weight of 700,000 or more and a butyl acrylate unit content of 90% by mass or more, and a tackifier are the main components
- a double-sided pressure-sensitive adhesive tape having a thickness of 2 to 10 ⁇ m on each side is known (see, for example, Patent Document 1).
- the heat radiating property may be lowered.
- the problem to be solved by the present invention is to provide a pressure-sensitive adhesive tape that is capable of preventing bubbles from being rapidly removed from the interface with the adherend, preventing bubbles from remaining at the interface, and having excellent adhesion. .
- the present inventors are adhesive tapes having two or more adhesive parts (B) on at least one surface (a) side of the support (A), and between the two or more adhesive parts (B).
- the problem is solved by an adhesive tape characterized in that there is a region having no adhesive part (B), and the region communicates with an end of the adhesive tape.
- the pressure-sensitive adhesive tape of the present invention is very thin, bubbles are quickly removed from the interface with the adherend, bubbles are not easily left at the interface, and the adhesive strength is excellent. It can be suitably used for adhesion between a casing constituting a device, a heat radiating member such as a graphite sheet, and a heat generating member such as a rechargeable battery.
- the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape having two or more pressure-sensitive adhesive parts (B) on at least one surface (a) side of the support (A), and is between the two or more pressure-sensitive adhesive parts (B). There is a region that does not have the adhesive part (B), and the region communicates with an end of the adhesive tape.
- the pressure-sensitive adhesive tape of the present invention having two or more pressure-sensitive adhesive portions (B) directly on at least one surface (a) side of the support (A), or the support
- the adhesive tape which has the said adhesion part (B) through the other layer on the at least one surface (a) side of a body (A) is mentioned.
- the support (A) When using a double-sided pressure-sensitive adhesive tape as the pressure-sensitive adhesive tape, the support (A) has two or more specific pressure-sensitive adhesive parts (B) on both sides (a), and the two or more pressure-sensitive adhesive parts (B). There is a region that does not have an adhesive part (B), and the double-sided adhesive tape has a configuration in which the region communicates with an end of the adhesive tape, or one side of the support (A) (a ) Side has two or more of the specific adhesive part (B), and there is an area not having the adhesive part (B) between the two or more adhesive parts (B).
- a double-sided pressure-sensitive adhesive tape having a configuration leading to the end and having an adhesive layer on the entire surface of the other surface of the support (A) can be used.
- the adhesive tape of the present invention is observed from the side surface direction, it is observed that the adhesive part (B) forms a convex shape with respect to the surface (a) of the support (A). .
- the adhesive tape of this invention has the structure which the area
- the pressure-sensitive adhesive tape of the present invention preferably uses a tape having a total thickness of 50 ⁇ m or less, particularly preferably a tape having a thickness of 20 ⁇ m or less, more preferably a tape having a thickness of 2 ⁇ m to 15 ⁇ m, It is more preferable to use a material having a thickness of 3 ⁇ m to 10 ⁇ m, and it is particularly preferable to use a material having a thickness of 3 ⁇ m to 6 ⁇ m, for example, in order to contribute to thinning of a portable electronic terminal or the like. Even if the pressure-sensitive adhesive tape of the present invention is very thin as described above, it retains excellent ease of air bubble removal and has excellent adhesive strength and thermal conductivity.
- the total thickness of the adhesive tape was measured in accordance with JIS K6783 under the condition that the dial gauge contact surface was flat, the diameter was 5 mm, and the load was 1.23 N. Refers to the thickness of the tape and does not include the thickness of the release liner. The thickness can be measured, for example, with a thickness meter TH-102 manufactured by Tester Sangyo.
- a tape having an adhesive strength of 1 N / 20 mm to 12 N / 20 mm is preferably used, and a tape having an adhesive strength of 1.5 N / 20 mm to 10 N / 20 mm is more preferably used. It is easy to remove bubbles from the interface between the adherend and the pressure-sensitive adhesive tape, and it has excellent adhesive strength even if it is thin, using a material having an adhesive strength of 3N / 20mm to 8N / 20mm. It is preferable for obtaining a pressure-sensitive adhesive tape.
- a pressure-sensitive adhesive tape having an adhesive strength of 4 N / 20 mm to 10 N / 20 mm, and 4.5 N / 20 mm to 8 N / It is more preferable to use one having an adhesive strength of 20 mm.
- the adhesive strength is a value measured according to JISZ0237. Specifically, the adhesive force is obtained by overlapping a surface having an adhesive part (B) of an adhesive tape lined with a polyethylene terephthalate film having a thickness of 25 ⁇ m and a clean and smooth stainless steel plate (BA plate) on its upper surface. Is pressed by reciprocating once using a 2 kg roller, and left for 1 hour or 24 hours under the conditions of 23 ° C. and 50% RH, and then at a speed of 0.3 m / min in the 180 ° direction. It is a value measured by peeling off the adhesive tape.
- the said backing was performed with respect to the surface which does not have the said adhesion part (B), and was not performed with respect to the surface which has the adhesion part (B) which is a structural requirement of this invention.
- the said adhesive tape has the said adhesive part (B) on both surfaces, the surface which has any one adhesive part (B) was lined.
- the pressure-sensitive adhesive tape of the present invention even if it is thin, it can be prevented from peeling off over time due to the repulsive force of the adherend and the support (A), part falling off, etc., and is used particularly at a relatively high temperature.
- the said adhesion retention strength points out the value measured according to JISZ0237.
- the adhesion holding force is obtained by overlapping a surface having an adhesive portion (B) of an adhesive tape lined with an aluminum foil having a thickness of 50 ⁇ m and a clean and smooth stainless steel plate (hairline), A test piece is a sample that is pressed by reciprocating once using a 2 kg roller and left for 1 hour under conditions of 23 ° C. and 50% RH. Next, after the stainless steel plate constituting the test piece is fixed in a vertical direction in an environment of 100 ° C., and left for 24 hours with a load of 100 g applied to the lower end portion of the adhesive tape constituting the test piece. This is a value obtained by measuring the displacement distance between the stainless steel plate and the adhesive tape with a caliper.
- the support (A) constituting the pressure-sensitive adhesive tape of the present invention preferably has a thickness of 1 ⁇ m to 20 ⁇ m, more preferably a thickness of 1 ⁇ m to 10 ⁇ m, and more preferably 1 ⁇ m to 4 ⁇ m. It is preferable to use a material having a thickness of 1.5 ⁇ m to 2.5 ⁇ m, so that the adhesive tape can be made thin and the surface having the adhesive part (B) and the surface to be covered Air bubbles can be easily removed from the interface with the adherend, and as a result, it is possible to more effectively prevent poor appearance due to swelling of the adhesive tape and performance degradation such as thermal conductivity and adhesive strength. More preferred.
- the support (A) for example, a sheet-like material obtained using a resin can be used.
- polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyamide (nylon), wholly aromatic polyamide (Amide resins such as aramid), acrylic resins such as polybutyl acrylate, polyethyl acrylate, polymethyl methacrylate (PMMA), polystyrene, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer ( ABS resins) and other styrenic resins, polyether ether ketone (PEEK), polyether ketone ketone and other polyether ketones, polyether sulfone (PES), polysulfone, polyvinyl chloride (PVC), Rephenylene sulfide (PPS), polyimide (PI), polyamideimide, polyetherimide (PET), polyethylene naphthalate (PEN), polybutylene
- the support (A) it is preferable to use a polyester film because there is little variation in thickness, excellent tensile strength and workability, and economical (cost), and a polyethylene terephthalate film is used. More preferably it is used. It is preferable to use a biaxially stretched polyester film because the strength of the support (A) and the pressure-sensitive adhesive tape obtained using the support can be further increased.
- the support (A) can be produced by molding the resin described above into a sheet shape.
- the said support body (A) can be manufactured with the following method, for example.
- a dry or undried polyester chip and, if necessary, a colorant or a masterbatch containing a colorant at a high concentration are melt-kneaded using a kneading extruder or the like.
- the kneaded product is extruded from a die and rapidly cooled and solidified on a rotary cooling drum to obtain an unstretched polyester film that is substantially in an amorphous state.
- the water content is preferably 50 ppm or less, more preferably When using a raw material such as polyester dried to be 30 ppm or less, or when using a twin screw extruder, a vent port is provided, preferably 40 hectopascals or less, more preferably 30 hectopascals or less, and even more preferably 20
- the method include a method performed under a reduced pressure environment below hectopascal, and a method employing an electrostatic application adhesion method and a liquid application adhesion method, for example, in order to improve the adhesion between the polyester film and the rotary cooling drum.
- the unstretched sheet is preferably stretched 2 to 6 times at 70 ° C. to 145 ° C. in the machine direction, and uniaxially stretched in the machine direction, The film is stretched 2 to 6 times at 90 ° C. to 160 ° C. in the transverse direction, and the heat setting process is performed.
- the polyester film is preferably relaxed by 0.1% to 20% in the vertical direction and / or the horizontal direction in the maximum temperature zone for heat treatment and / or the cooling zone at the heat treatment outlet.
- the stretched polyester film obtained by the above method may be relonged and restretched as necessary.
- the support (A) obtained by the above method may be composed of a single layer, or may be composed of multiple layers made of the same or different resins.
- said support body (A) in order to further improve the adhesiveness with the said adhesion part (B) and another adhesion layer, etc., on one side or both surfaces, for example, chromic acid treatment, ozone exposure treatment Those having been subjected to oxidation treatment such as flame exposure treatment, high piezoelectric impact exposure treatment, ionizing radiation treatment, etc., and those having a primer layer formed by using a coating agent or the like can be used.
- Adhesive part (B) Next, the adhesive part (B) which comprises the adhesive tape of this invention is demonstrated.
- the adhesive part (B) is provided on one side or both sides of the support (A) directly or via another layer as described above.
- the shape of the pressure-sensitive adhesive part (B) is substantially square, substantially hexagonal, or substantially circular when the pressure-sensitive adhesive tape of the present invention is observed from one side (a) of the support (A). It is preferable to have a substantially circular shape because air bubbles can be easily removed from the interface with the adherend (air release property) and a good adhesive force can be maintained.
- the substantially circular shape is not particularly limited, but the ratio of the maximum diameter to the minimum diameter [maximum diameter / minimum diameter] of any one adhesive part is preferably 1 to 4. More preferably, it is 1 to 2, and most preferably 1 to 1.5.
- An example of a substantially circular shape is a shape as shown in FIG.
- the adhesive portions having the above shapes are basically independent of each other, but there may be a portion where two or more adhesive portions are partially connected as shown in FIG.
- the substantially quadrangular shape examples include shapes such as a substantially square shape, a substantially rectangular shape, a substantially trapezoidal shape, and a substantially rhombus shape, and it is easy to remove bubbles from the interface with the adherend (air release property). In addition, it is preferable because a good adhesive force can be maintained.
- the “substantially” such as the substantially square shape and the substantially hexagonal shape is, for example, when a release liner or the like is attached to the surface of the adhesive portion (B), or when the adhesive tape is wound around a roll.
- the adhesive part (B) By pressing the adhesive part (B), it is shown that the corners of the quadrangular and hexagonal shapes are rounded and the straight part includes a curved part.
- the corners of the substantially square shape are preferably substantially rhombus with the angle of the corners facing the flow direction of the adhesive tape being less than 90 °, and the range of 45 ° to 70 ° It is more preferable because air bubbles can be easily removed from the interface with the body (air release property) and a good adhesive force can be maintained.
- the arbitrary adhesive part (b1) and the adhesive part (b2) constituting the two or more adhesive parts (B) do not face each other with respect to the flow direction and the width direction of the adhesive tape.
- the adhesive tape is often used after being cut into an arbitrary shape depending on the application.
- the adhesive part (b1) and the adhesive part (b2) are arranged so as not to face each other in the flow direction and the width direction, when the adhesive tape is cut at an arbitrary position, its end part Since the adhesive part (B) is present in a part of the adhesive tape, it is possible to suppress peeling of the adhesive tape.
- the distance between an arbitrary adhesive part (b1) selected from the two or more adhesive parts (B) and another adhesive part (b2) close to (adjacent to) the adhesive part (b1) is: It is preferably 0.5 mm or less, more preferably 0.05 mm to 0.2 mm, further preferably 0.06 mm to 0.15 mm, and 0.08 mm to 0.13 mm. It is particularly preferable because air bubbles can be easily removed from the interface with the adherend (air release property) and can maintain a good adhesive force.
- the size per arbitrary adhesive part (b1) selected from the adhesive parts (B) is preferably 0.001 mm 2 to 100 mm 2 and 0.01 mm 2 to 25 mm 2. More preferably, 0.015 mm 2 to 16 mm 2 is more preferable, and 0.02 mm 2 to 5 mm 2 is easy to remove air bubbles from the interface with the adherend (air release property) and good. This is particularly preferable because the adhesive strength can be maintained.
- the pressure-sensitive adhesive part (B) is preferably present in the range of 10 to 1000000, more preferably 1000 to 50000 in the area of the pressure-sensitive adhesive tape of the present invention (square of 5 cm in the flow direction and 5 cm in the width direction). More preferably, 5,000 to 40,000 are particularly preferable because air bubbles can be easily removed from the interface with the adherend (air releasing property) and good adhesive force can be maintained.
- the adhesive tape bubbles can be easily removed from the interface with the adherend during application (air release property), can maintain a good adhesive force, and the adherend such as a graphite sheet can be made thinner. Even in such a case, from the viewpoint of effectively preventing appearance defects due to the shape of the adhesive part, 120 to a predetermined area of the adhesive tape (1 cm in the flow direction and 1 cm in the width direction) It is preferable to use one having 2000 adhesive parts, more preferably one having 280 to 1600 adhesive parts, more preferably one having 520 to 1200 adhesive parts. Further preferred.
- the number of the above-mentioned adhesion parts is any by observing and counting an arbitrary range (1 cm in the flow direction and 1 cm in the width direction) or (a square in the flow direction of 5 cm and 5 cm in the width direction) with an electron microscope. Can be sought.
- the peak temperature of the loss tangent based on the dynamic viscoelastic spectrum measured at a frequency of 1 Hz of the adhesive part (B) is not particularly limited, but is preferably ⁇ 30 ° C. to 20 ° C., More preferably, it is 20 ° C. to 10 ° C., and ⁇ 10 ° C. to 5 ° C. allows air bubbles to easily escape from the interface with the adherend (air release properties) and can maintain a good adhesive force. As a result, it is more preferable because it is possible to more effectively prevent poor appearance due to swelling of the pressure-sensitive adhesive tape and the like, and performance degradation such as thermal conductivity, heat resistance, and adhesive strength.
- a viscoelasticity tester manufactured by Rheometrics, trade name: Ares 2KSTD
- a test piece is sandwiched between parallel disks which are measurement units of the tester and stored at a frequency of 1 Hz.
- An elastic modulus (G ′) and a loss elastic modulus (G ′′) are measured.
- the peak temperature refers to the peak temperature confirmed in the spectrum of tan ⁇ with respect to the measurement temperature range ( ⁇ 50 ° C. to 150 ° C.).
- a pressure-sensitive adhesive layer having a thickness of 0.5 mm to 2.5 mm formed using the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive part (B) can be used.
- the pressure-sensitive adhesive part (B) is preferably one having a gel fraction of 10% by mass to 60% by mass, more preferably one having a gel fraction of 20% by mass to 55% by mass.
- a material having a gel fraction of 30% by mass to 50% by mass prevents the change over time because the surface shape of the adhesive part (B) is easily maintained even if it is thin. Air bubbles can be easily removed from the interface between the adherend and the adhesive part (B). As a result, poor appearance due to swelling of the adhesive tape, thermal conductivity, heat resistance and adhesive strength. It is more preferable because it is possible to more effectively prevent such performance degradation.
- the said gel fraction points out the value measured with the following method.
- the said gel fraction points out the value measured by the method shown below.
- a pressure-sensitive adhesive layer was formed by aging under for 2 days.
- the test piece was prepared by cutting the pressure-sensitive adhesive layer into a square having a length of 50 mm and a width of 50 mm.
- the insoluble component in toluene was extracted by filtering the mixture of the test piece and toluene using a 300 mesh wire net.
- the mass (G2) of the insoluble component dried at 110 ° C. for 1 hour was measured.
- the gel fraction was calculated based on the mass (G1), mass (G2) and the following formula.
- the adhesive part (B) one having a thickness of 1 ⁇ m to 6 ⁇ m is preferably used, and one having a thickness of 2 ⁇ m to 5 ⁇ m is preferably used from the interface between the adherend and the adhesive part (B). Can be easily removed, and as a result, poor appearance due to swelling of the pressure-sensitive adhesive tape and performance degradation such as thermal conductivity, heat resistance and adhesive strength can be more effectively prevented.
- the thickness of the adhesive part (B) is measured by a method using a dial gauge in accordance with JIS K6783 under the condition that the contact surface of the dial gauge is flat, the diameter thereof is 5 mm, and the load is 1.23N. Refers to the thickness of double-sided adhesive tape.
- the adhesive part (B) is, for example, an acrylic adhesive, a rubber adhesive, a silicone adhesive, a urethane adhesive, a polyester adhesive, a styrene-diene block copolymer adhesive, a vinyl alkyl ether adhesive. It can be formed using a known pressure-sensitive adhesive such as a polyamide-based pressure-sensitive adhesive, a fluorine-based pressure-sensitive adhesive, a creep property-improving pressure-sensitive adhesive, or a radiation curable pressure-sensitive adhesive. Especially, as said adhesive part (B), since it is excellent in adhesive reliability, it is preferable to use the adhesive part obtained using an acrylic adhesive.
- the pressure-sensitive adhesive portion or pressure-sensitive adhesive layer has the same composition or gel fraction, but has a different composition or gel content. You may use the adhesion part or adhesion layer which is rate.
- acrylic pressure-sensitive adhesive one containing an acrylic polymer can be used.
- acrylic polymer a polymer obtained by polymerizing a monomer component containing a (meth) acrylic monomer such as a (meth) acrylic acid alkyl ester can be used.
- Examples of the (meth) acrylic acid alkyl ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, (meth ) Isobutyl acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate , 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, (meth
- (meth) acrylic acid alkyl ester it is preferable to use a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group, and the alkyl group having 4 to 18 carbon atoms. It is more preferable to use (meth) acrylic acid alkyl ester.
- the alkyl group include linear or branched alkyl groups.
- the (meth) acrylic acid alkyl ester having 4 to 18 carbon atoms for the acrylic group it is easy to maintain the surface shape of the pressure-sensitive adhesive layer (B) by using butyl (meth) acrylate, It is preferable for obtaining a pressure-sensitive adhesive tape that can easily prevent a change with time, can easily remove bubbles from the interface with the adherend (air release property), and can maintain a good adhesive force.
- a monomer having a carboxyl group such as (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, or the anhydride thereof
- a monomer having a sulfonic acid group such as sodium vinyl sulfonate; a monomer having a cyano group such as acrylonitrile; an amide group such as acrylamide, methacrylamide, N-vinylpyrrolidone, N, N-dimethyl (meth) acrylamide
- a monomer having a hydroxyl group such as hydroxyalkyl (meth) acrylate and glycerin dimethacrylate
- a monomer having an amino group such as aminoethyl (meth) acrylate and (meth) acryloylmorpholine
- Imides such as cyclohexylmaleimide and isopropylmaleimide
- the monomer includes aromatic vinyl compounds such as styrene and substituted styrene; olefins such as ethylene, propylene, and butadiene; vinyl esters such as vinyl acetate; Vinyl chloride or the like can also be used.
- aromatic vinyl compounds such as styrene and substituted styrene
- olefins such as ethylene, propylene, and butadiene
- vinyl esters such as vinyl acetate
- Vinyl chloride or the like can also be used.
- the acrylic polymer can be produced by polymerizing the monomer by a method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, or an emulsion polymerization method, and a solution polymerization method may be employed. It is preferable for improving the production efficiency of the acrylic polymer.
- polymerization initiator examples include peroxides such as benzoyl peroxide and lauryl peroxide, azo thermal polymerization initiators such as azobisisobutylnitrile, acetophenone photopolymerization initiators, benzoin ether photopolymerization initiators, benzyl A ketal photopolymerization initiator, an acyl phosphine oxide photopolymerization initiator, a benzoin photopolymerization initiator, a benzophenone photopolymerization initiator, or the like can be used.
- peroxides such as benzoyl peroxide and lauryl peroxide
- azo thermal polymerization initiators such as azobisisobutylnitrile
- acetophenone photopolymerization initiators benzoin ether photopolymerization initiators
- benzoin ether photopolymerization initiators benzyl A ketal photopolymerization initiator
- the acrylic polymer obtained by the above method may be in a state of being dissolved or dispersed in an organic solvent, for example, when produced by a solution polymerization method.
- acrylic polymer obtained by the above method those having a weight average molecular weight of 300,000 to 1,200,000 are preferably used, and those having a weight average molecular weight of 400,000 to 1,100,000 are more preferably used. It is preferable to use one having a weight average molecular weight of 500,000 to 1,000,000 in order to obtain a pressure-sensitive adhesive tape having even better adhesive strength and ease of air bubble removal even if it is thin.
- the weight average molecular weight is a value measured by gel permeation chromatography (GPC method) and calculated in terms of standard polystyrene. Specifically, the weight average molecular weight can be measured using a GPC apparatus (HLC-8329GPC) manufactured by Tosoh Corporation under the following conditions.
- a pressure-sensitive adhesive containing a tackifying resin is used to form a pressure-sensitive adhesive part having even better adhesive strength, tensile strength, and tensile breaking strength. It is preferable.
- the tackifying resin examples include a rosin tackifying resin, a polymerized rosin tackifying resin, a polymerized rosin ester tackifying resin, a rosin phenol tackifying resin, a stabilized rosin ester tackifying resin, and a disproportionated rosin ester. It is possible to use petroleum resin-based tackifiers such as styrene-based tackifier resins, hydrogenated rosin ester-based tackifier resins, terpene-based tackifier resins, terpene phenol-based tackifier resins, and styrene-based tackifier resins.
- the tackifying resin a combination of a rosin-based tackifying resin and a petroleum resin-based tackifying resin is used, and the pressure-sensitive adhesive tape has an even better adhesive force and ease of removing bubbles. Is preferable in obtaining.
- the rosin-based tackifying resin and petroleum resin-based tackifying resin are particularly preferably used in combination with the acrylic polymer, and an acrylic polymer obtained by polymerizing a monomer containing butyl (meth) acrylate; Use in combination is preferable in order to obtain a pressure-sensitive adhesive tape having even better adhesive strength and ease of air bubble removal even if it is thin.
- the tackifying resin it is preferable to use a tackifying resin that is liquid at room temperature in order to further improve the initial adhesive strength of the pressure-sensitive adhesive part (B).
- the tackifying resin that is liquid at room temperature include low-molecular-weight liquid rubbers such as process oil, polyester plasticizer, and polybutene, and terpene phenol resins can be used.
- the tackifying resin is preferably used in the range of 20 to 60 parts by mass, more preferably in the range of 30 to 55 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is more preferable for obtaining a pressure-sensitive adhesive tape having a high adhesive strength.
- an adhesive which comprises the said adhesion part (B) what contains a softener, a plasticizer, a filler, anti-aging agent, a coloring agent etc. as needed other than the said acrylic polymer Can be used.
- the use of a crosslinking agent can adjust the gel fraction of the adhesive part (B) to a suitable range, and as a result, the shape of the adhesive part (B) is easily maintained. This is preferable because it is easy to prevent a change, air bubbles can be easily removed from the interface between the adherend and the pressure-sensitive adhesive layer (B), and a pressure-sensitive adhesive tape with excellent adhesive strength can be obtained. .
- crosslinking agent for example, an isocyanate crosslinking agent or an epoxy crosslinking agent is preferably used.
- isocyanate crosslinking agent examples include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane modified tolylene diisocyanate, and the like. It is preferable to use a toluene diisocyanate adduct such as trimethylolpropane-modified tolylene diisocyanate.
- the toluene diisocyanate adduct has a structure derived from toluene diisocyanate in the molecule, and examples of commercially available products include Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.).
- the isocyanate crosslinking agent it is preferable to use an acrylic polymer having a hydroxyl group as the acrylic polymer.
- the acrylic polymer having a hydroxyl group is a monomer used for the production thereof, such as 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, etc. It is more preferable to use 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate.
- epoxy crosslinking agent for example, Tetrad X or Tetrad C manufactured by Mitsubishi Gas Chemical Co., Ltd., or E-05X manufactured by Soken Chemical Co., Ltd. can be used.
- an acrylic polymer having an acid group As the acrylic polymer, it is preferable to use an acrylic polymer having an acid group as the acrylic polymer.
- the acrylic polymer having an acid group preferably uses, for example, (meth) acrylic acid, acrylic acid dimer, itaconic acid, crotonic acid, maleic acid, maleic anhydride, etc. It is more preferable to use (meth) acrylic acid.
- the pressure-sensitive adhesive that can be used for forming the pressure-sensitive adhesive part (B), it is preferable to use a pressure-sensitive adhesive containing a solvent as necessary.
- the pressure-sensitive adhesive preferably has a viscosity adjusted to a range of 0.1 mPa ⁇ s to 1000 mPa ⁇ s, and preferably has a viscosity adjusted to a range of 1 mPa ⁇ s to 200 mPa ⁇ s. More preferably, it is more preferable to use one adjusted to a range of 10 mPa ⁇ s to 100 mPa ⁇ s because the adhesive part (B) having a predetermined shape can be easily formed.
- the pressure-sensitive adhesive tape of the present invention is produced, for example, by applying the pressure-sensitive adhesive intermittently on at least one surface (a) side of the support (A) and drying it to form a pressure-sensitive adhesive part (B). Can do.
- the pressure-sensitive adhesive tape can also be produced by applying the pressure-sensitive adhesive intermittently on both sides of the support (A) and drying it.
- the pressure-sensitive adhesive is preferably applied intermittently to at least one surface (a) of the support (A) by a coating method such as a gravure coating method or a slot die coating method. It is preferable to apply by a coating method.
- the pressure-sensitive adhesive tape may be formed by, for example, applying the pressure-sensitive adhesive on the surface of a release liner and drying the pressure-sensitive adhesive portion (B), and then forming the pressure-sensitive adhesive portion (B) on at least one of the supports (A). It can manufacture by transferring to the surface (a) side.
- the pressure-sensitive adhesive tape of the present invention may be prepared, for example, using a release liner as described above, and then the release liner is peeled off as necessary and another release liner is affixed.
- the pressure-sensitive adhesive tape of the present invention has an excellent adhesive force even if it is very thin, it can be suitably used, for example, in the production scene of electronic devices such as portable electronic terminals that are required to be thin.
- the clearance between adherends adheresive site of the adhesive tape
- the adherends can be firmly bonded.
- seat which is concerned about the fall of the performance resulting from the said bubble remaining, fixation of a magnetic sheet It can be suitably used for applications and the like.
- the heat-generating member or a member adjacent to the heat-generating member is radiated by a heat-dissipating sheet or the like for the purpose of diffusing the heat. Members are often affixed.
- heat dissipating member for example, a graphite sheet or a graphene sheet is preferably used.
- the graphite sheet includes two types, an artificial graphite sheet and a natural graphite sheet.
- Examples of the artificial graphite sheet include a pyrolytic graphite sheet obtained by pyrolyzing an organic film such as a polyimide film in a high-temperature inert gas atmosphere.
- the graphite sheet it is preferable to use a sheet having less wrinkles from the standpoint of further improving heat dissipation, and it is more preferable to use an artificial graphite sheet having less wrinkles.
- the thickness of the graphite sheet is preferably 10 ⁇ m to 100 ⁇ m, and more preferably 15 ⁇ m to 50 ⁇ m, in order to contribute to thinning of electronic devices such as portable electronic terminals.
- the graphite sheet is relatively brittle, it is generally used in the form of a graphite composite sheet having an adhesive tape attached to one or both sides thereof.
- the graphite composite sheet for example, as shown in FIG. 5, it is possible to use a graphite composite sheet having a configuration sealed with a single-sided adhesive tape and a double-sided adhesive tape, to increase the strength and insulation of the graphite sheet. It is preferable to achieve both.
- the pressure-sensitive adhesive tape of the present invention can be suitably used when pouching the graphite sheet.
- the bonding of the graphite composite sheet and the member is performed, for example, by placing the graphite composite sheet on the surface of the member and temporarily bonding them by lightly pressing them, after the temporary bonding, using a roller or the like. It can be carried out through a step of pressing and firmly bonding them.
- bubbles are usually present at the interface between the member and the graphite composite sheet.
- it is a graphite composite sheet using the adhesive tape of this invention, when it pressurizes with the said roller etc., the said bubble will be removed from the said interface rapidly.
- a surface protective film is often attached to the graphite composite sheet for the purpose of preventing scratches on the surface thereof.
- the surface protective film is usually removed after attaching the graphite composite sheet and the member.
- the pressure-sensitive adhesive tape of the present invention it is possible to firmly adhere to an adherend such as a member after the bubbles are removed. Therefore, when removing the surface protective film from the graphite composite sheet, the member of the graphite composite sheet Difficult to cause floating or peeling off.
- the graphite composite sheet obtained using the pressure-sensitive adhesive tape of the present invention can prevent air bubbles from existing at the interface with the adherend such as a member. Therefore, the thermal resistance of the pressure-sensitive adhesive tape due to the presence of the air bubbles The increase in value can be effectively prevented, and as a result, the thermal conductivity in the thickness direction of the adhesive tape can be improved.
- the magnetic sheet is used to block the leakage of electromagnetic waves emitted from the members constituting the electronic device to the outside, and to prevent the electromagnetic waves generated outside from affecting the electronic device. It is often affixed to.
- the magnetic sheet examples include Ni-based ferrite magnetic powder, Mg-based ferrite magnetic powder, Mn-based ferrite magnetic powder, Ba-based ferrite magnetic powder, Sr-based ferrite magnetic powder, Fe—Si alloy powder, Fe— Sheets obtained using Ni alloy powder, Fe—Co alloy powder, Fe—Si—Al alloy powder, Fe—Si—Cr alloy powder, iron powder, Fe-based amorphous, Co-based amorphous, Fe-based nanocrystals, etc. Can be used.
- the pressure-sensitive adhesive tape of the present invention is very thin as described above, the magnetic sheet having a maximum thickness can be used.
- the magnetic sheet is preferably used in the form of a magnetic composite sheet in which an adhesive tape is attached on one or both sides for the purpose of imparting good insulation and high strength.
- the pressure-sensitive adhesive solution and 2.0 parts by mass of “NC40” (manufactured by DIC Corporation, isocyanate crosslinking agent) were mixed and stirred to obtain pressure-sensitive adhesive a.
- the peak temperature of tan ⁇ of the pressure-sensitive adhesive layer obtained using the pressure-sensitive adhesive a was 0 ° C., and the gel fraction thereof was 40% by mass.
- the pressure-sensitive adhesive b was obtained by mixing and stirring the pressure-sensitive adhesive solution and 0.6 part by mass of “NC40” (manufactured by DIC Corporation, isocyanate crosslinking agent).
- the peak temperature of tan ⁇ of the pressure-sensitive adhesive layer obtained using the pressure-sensitive adhesive b was 0 ° C., and the gel fraction thereof was 10% by mass.
- the pressure-sensitive adhesive solution and “NC40” manufactured by DIC Corporation, isocyanate cross-linking agent 3.3 parts by mass were mixed and stirred to obtain pressure-sensitive adhesive c.
- the peak temperature of tan ⁇ of the pressure-sensitive adhesive layer obtained using the pressure-sensitive adhesive c was 0 ° C., and the gel fraction thereof was 46% by mass.
- the pressure-sensitive adhesive d was obtained by mixing and stirring the pressure-sensitive adhesive solution and 1.2 parts by weight of “NC40” (manufactured by DIC Corporation, isocyanate-based crosslinking agent).
- the peak temperature of tan ⁇ of the pressure-sensitive adhesive layer obtained using the pressure-sensitive adhesive d was 0 ° C., and the gel fraction thereof was 20% by mass.
- the pressure-sensitive adhesive e was obtained by mixing and stirring the pressure-sensitive adhesive solution and 1.3 parts by mass of “NC40” (manufactured by DIC Corporation, isocyanate crosslinking agent).
- the peak temperature of tan ⁇ of the pressure-sensitive adhesive layer obtained using the pressure-sensitive adhesive e was ⁇ 15 ° C., and the gel fraction was 40% by mass.
- Adhesive f 44.9 parts by mass of n-butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of vinyl acetate, 2 parts by mass of acrylic acid, and 0.1 part by mass of 4-hydroxybutyl acrylate were mixed with azobisiso
- An acrylic polymer having a weight average molecular weight of 800,000 was obtained by performing solution polymerization at 70 ° C. for 10 hours in an ethyl acetate solution using 0.1 part by mass of butyronitrile as a polymerization initiator.
- the pressure-sensitive adhesive f was obtained by mixing and stirring the pressure-sensitive adhesive solution and 1.3 parts by mass of “NC40” (manufactured by DIC Corporation, isocyanate crosslinking agent).
- the peak temperature of tan ⁇ of the pressure-sensitive adhesive layer obtained using the pressure-sensitive adhesive f was ⁇ 25 ° C., and the gel fraction was 40% by mass.
- Example 1 “PET25 ⁇ 1J0L” (manufactured by Nipper Co., Ltd., coated with the pressure-sensitive adhesive a using a roll coater on a release liner having a silicone release surface on the surface of a smooth PET film, and then at 100 ° C. for 1 minute. By drying, an adhesive layer having a thickness of 1 ⁇ m was produced.
- the pressure-sensitive adhesive layer was transferred to one side of “K100-2.0W” (Mitsubishi Resin, polyester film, thickness 2 ⁇ m) as a support to obtain a single-sided tape.
- K100-2.0W Mitsubishi Resin, polyester film, thickness 2 ⁇ m
- the pressure-sensitive adhesive a is dot-printed on the other surface of the support constituting the single-sided tape using a gravure coater and dried at 100 ° C. for 1 minute, thereby forming a substantially rhombus shape shown in FIG.
- An adhesive tape with a total thickness of 6 ⁇ m having an adhesive part with a thickness of 3 ⁇ m was obtained.
- the distance of the arbitrary adhesion part and the adhesion part adjacent to it was 0.1 mm among the said adhesion parts.
- PET25 ⁇ 1J0L (manufactured by Nipper Co., Ltd., release liner having a silicone-based release treatment surface on the surface of a smooth PET film) is laminated on the surface of the adhesive tape obtained above with a laminator. Affixed at 3 N / mm.
- Examples 2 to 12 A pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the shape and area of the pressure-sensitive adhesive part (B) and the thickness of the pressure-sensitive adhesive part (B) were changed to those shown in Tables 1 to 3.
- Example 13 “PET25 ⁇ 1J0L” (manufactured by Nipper Co., Ltd., release liner having a silicone-based release treatment surface on the surface of a smooth PET film) is dot-printed with the adhesive a using a gravure coater, and 100 ° C. for 1 minute. By drying, an adhesive part having a thickness of 3 ⁇ m and a substantially rhombus shape (the angle of the corner part facing the flow direction of the adhesive tape was 60 °) shown in FIG. 1 was formed. In addition, the distance of the arbitrary adhesion part and the adhesion part adjacent to it was 0.1 mm among the said adhesion parts.
- the adhesive part was transferred to one side of “K100-2.0W” (Mitsubishi Resin Co., Ltd., polyester film, thickness 2 ⁇ m) as a support to obtain a single-sided tape.
- “K100-2.0W” Mitsubishi Resin Co., Ltd., polyester film, thickness 2 ⁇ m
- the pressure-sensitive adhesive a is dot-printed on the other surface of the support constituting the single-sided tape using a gravure coater and dried at 100 ° C. for 1 minute, thereby forming a substantially rhombus shape (
- a pressure-sensitive adhesive portion having a thickness of 3 ⁇ m and an angle of the corner portion facing the flow direction of the pressure-sensitive adhesive tape was 60 °.
- the distance of the arbitrary adhesion part and the adhesion part adjacent to it was 0.1 mm among the said adhesion parts.
- Example 14 An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive b was used instead of the adhesive a.
- Example 15 An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive c was used instead of the adhesive a.
- Example 16 An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive d was used instead of the adhesive a.
- Example 17 An adhesive tape was obtained in the same manner as in Example 1 except that adhesive e was used instead of adhesive a.
- Example 18 An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive f was used in place of the adhesive a.
- Example 19 to 25 An adhesive tape was prepared in the same manner as in Example 1 except that the shape and area of the adhesive part (B) and the thickness of the adhesive part (B) were changed to those shown in Tables 4 and 5. Moreover, the surface which has a substantially circular adhesion part of the adhesive tape obtained in Example 20 was observed at 200-times multiplication factor using the optical microscope (FIG. 6).
- the pressure-sensitive adhesive layer was transferred to one side of “K100-2.0W” (Mitsubishi Resin, polyester film, thickness 2 ⁇ m) as a support to obtain a single-sided tape.
- K100-2.0W Mitsubishi Resin, polyester film, thickness 2 ⁇ m
- the pressure-sensitive adhesive layer having a thickness of 3 ⁇ m is formed by drying at 100 ° C. for 1 minute. Produced.
- PET25 ⁇ 1J0L manufactured by Nipper Co., Ltd., with a release liner having a silicone release treatment surface on the surface of a smooth surface PET film is laminated on the surface of the pressure-sensitive adhesive tape obtained above with a laminator. Affixed at / mm.
- the pressure-sensitive adhesive a was coated on a single-sided tape support using a roll coater, and then dried at 100 ° C. for 1 minute to prepare a pressure-sensitive adhesive layer having a thickness of 2 ⁇ m.
- the pressure of the laminator used when transferring the pressure-sensitive adhesive layer to the support was set to a linear pressure of 3 N / mm.
- the release paper subjected to the grid-like embossing treatment is bonded to the pressure-sensitive adhesive layer and cured at 40 ° C. for 2 days to provide a pressure-sensitive adhesive layer having an uneven shape as shown in FIG. 7 on the surface of the pressure-sensitive adhesive layer.
- An adhesive tape was obtained.
- FIG. 7 shows the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape obtained in Comparative Example 2 observed using an optical microscope at a magnification of 100 times.
- the pressure-sensitive adhesive layer having a thickness of 2 ⁇ m was prepared by drying at 100 ° C. for 1 minute.
- the pressure-sensitive adhesive layer was transferred to the other surface of the support to obtain a pressure-sensitive adhesive tape having a total thickness of 6 ⁇ m.
- the pressure of the laminator used when transferring the pressure-sensitive adhesive layer to the support was set to a linear pressure of 3 N / mm.
- the test piece After measuring the mass (G1) of the test piece, the test piece was immersed in toluene in a 23 ° C. environment for 24 hours. After the immersion, the mixture of the test piece and toluene was filtered using a 300 mesh wire net to extract insoluble components in toluene. The mass (G2) of the insoluble component dried at 110 ° C. for 1 hour was measured.
- the gel fraction was calculated based on the mass (G1), mass (G2) and the following formula.
- the pressure-sensitive adhesives a to f were each applied to the surface of the release liner so as to have a dry thickness of 50 ⁇ m and dried to form a pressure-sensitive adhesive layer, which was then cured in an environment of 40 ° C. for 2 days.
- a test piece was prepared by laminating the adhesive layer after curing until the total thickness was 2 mm.
- the test piece was sandwiched between parallel disk-shaped measuring parts having a diameter of 7.9 mm, a frequency of 1 Hz, and a heating time of 1 ° C./1.
- the storage elastic modulus (G ′) and loss elastic modulus (G ′′) were measured from ⁇ 50 ° C. to 150 ° C. under the condition of min.
- the loss tangent tan ⁇ was calculated from the following calculation formula.
- a single-sided adhesive tape “IL-05G” manufactured by DIC Corporation having a length of 104 mm, a width of 104 mm and a thickness of 5 ⁇ m is bonded to one side of a graphite sheet having a length of 100 mm ⁇ width of 100 mm ⁇ thickness of 25 ⁇ m.
- the adhesive tapes obtained in Examples and Comparative Examples were cut into a size of 104 mm length ⁇ 104 mm width, and bonded together.
- the pressure-sensitive adhesive layer having a smooth surface was in contact with the graphite sheet.
- the pressure-sensitive adhesive tapes obtained in Examples and Comparative Examples were cut into a width of 20 mm, and a test piece was prepared by backing one side of the pressure-sensitive adhesive layer with a polyethylene terephthalate film having a thickness of 25 ⁇ m.
- the backing is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a constituent of the present invention.
- test piece was affixed to the surface of a clean and smooth stainless steel plate and pressurized by reciprocating a 2 kg roller on its upper surface under conditions of 23 ° C. and 50% RH according to JISZ-0237. After leaving for 1 hour, peel adhesion (peeling direction: 180 °, tensile speed: 0.3 m / min) was measured using a Tensilon tensile tester in an atmosphere of 23 ° C. and 50% RH. The measurement results are shown in the column of “Adhesive strength (1 hour after sticking)” in the table.
- the pressure-sensitive adhesive tapes obtained in Examples and Comparative Examples were cut into a width of 20 mm, and a test piece was prepared by backing one side of the pressure-sensitive adhesive layer with a polyethylene terephthalate film having a thickness of 25 ⁇ m. The backing is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a constituent of the present invention.
- test piece was affixed to the surface of a clean and smooth stainless steel plate, and was pressed by reciprocating once using a 2 kg roller on the upper surface, under conditions of 23 ° C. and 50% RH according to JISZ-0237. After being left for 24 hours, peel adhesion (peeling direction: 180 °, tensile speed: 0.3 m / min) was measured using a Tensilon tensile tester in an atmosphere of 23 ° C. and 50% RH. The measurement results are shown in the column of “Adhesive strength (24 hours after application)” in the table.
- the pressure-sensitive adhesive tapes obtained in Examples and Comparative Examples were cut to a width of 20 mm, and a test piece was prepared by backing the pressure-sensitive adhesive layer on one side with an aluminum foil having a thickness of 50 ⁇ m. The backing is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a constituent of the present invention.
- test piece was affixed to the surface of a clean and smooth stainless steel plate so as to have an affixing area of 20 mm ⁇ 20 mm, and pressurized by reciprocating once using a 2 kg roller on the upper surface thereof to JISZ-0237.
- a load of 100 g was applied in the shear direction under an atmosphere of 100 ° C., and the deviation distance of the tape after 24 hours was measured.
- the measurement results are shown in the “holding force” column of the table.
- the number of adhesive parts was determined by observing and counting an arbitrary range (5 cm in the flow direction and 5 cm width) or (a square in the flow direction 1 cm and 1 cm width) range of the adhesive tape.
- substantially rhombus 1 in the table refers to a rhombus-shaped pressure-sensitive adhesive portion in which the angle of the corner portion facing the flow direction of the adhesive tape is 60 ° (the angle of the corner portion facing the width direction is 120 °) ( Fig. 1)
- substantially rhombus 2 refers to a rhombus-shaped adhesive portion in which the angle of the corner portion facing the flow direction of the adhesive tape is 30 ° (the angle of the corner portion facing the width direction is 150 °).
- “Substantially square shape” refers to a square-shaped adhesive portion having an angle of 90 ° in the flow direction of the adhesive tape (an angle of the corner portion in the width direction is 90 °).
- Shape refers to the adhesive portion having the shape shown in FIG. 2
- substantially hexagonal (hatched) refers to the adhesive portion having the shape illustrated in FIG. 3
- substantially square (hatched) refers to the adhesive portion having the shape illustrated in FIG. Point to.
- each of the adhesive tapes of the examples has a plurality of independent adhesive layers on one surface, it is excellent in ease of air bubble removal.
- the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of Comparative Example 1 is smooth, there is no bubble passage and the ease of bubble removal is extremely poor.
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Abstract
Description
本発明の粘着テープを構成する支持体(A)としては、1μm~20μmの厚さのものを使用することが好ましく、1μm~10μmの厚さのものを使用することがより好ましく、1μm~4μmの厚さのものを使用することが好ましく、1.5μm~2.5μmの厚さのものを使用することが、粘着テープを薄型化でき、かつ、前記粘着部(B)を有する面と被着体との界面から気泡を容易に除去することができ、その結果、前記粘着テープの膨れ等に起因した外観不良や、熱伝導性や接着力等の性能低下をより効果的に防止できるためより好ましい。 [Support (A)]
The support (A) constituting the pressure-sensitive adhesive tape of the present invention preferably has a thickness of 1 μm to 20 μm, more preferably a thickness of 1 μm to 10 μm, and more preferably 1 μm to 4 μm. It is preferable to use a material having a thickness of 1.5 μm to 2.5 μm, so that the adhesive tape can be made thin and the surface having the adhesive part (B) and the surface to be covered Air bubbles can be easily removed from the interface with the adherend, and as a result, it is possible to more effectively prevent poor appearance due to swelling of the adhesive tape and performance degradation such as thermal conductivity and adhesive strength. More preferred.
次に、本発明の粘着テープを構成する粘着部(B)について説明する。 [Adhesive part (B)]
Next, the adhesive part (B) which comprises the adhesive tape of this invention is demonstrated.
なお、上記粘着部の数は、いずれも、粘着テープの任意の範囲(流れ方向1cm及び幅方向1cmの正方形)または(流れ方向5cm及び幅方向5cmの正方形)を電子顕微鏡で観察し数えることによって求めることができる。 In addition, as the adhesive tape, bubbles can be easily removed from the interface with the adherend during application (air release property), can maintain a good adhesive force, and the adherend such as a graphite sheet can be made thinner. Even in such a case, from the viewpoint of effectively preventing appearance defects due to the shape of the adhesive part, 120 to a predetermined area of the adhesive tape (1 cm in the flow direction and 1 cm in the width direction) It is preferable to use one having 2000 adhesive parts, more preferably one having 280 to 1600 adhesive parts, more preferably one having 520 to 1200 adhesive parts. Further preferred.
In addition, the number of the above-mentioned adhesion parts is any by observing and counting an arbitrary range (1 cm in the flow direction and 1 cm in the width direction) or (a square in the flow direction of 5 cm and 5 cm in the width direction) with an electron microscope. Can be sought.
サンプル注入量:100μl
溶離液:テトラヒドロフラン
流速:1.0ml/分
測定温度:40℃
本カラム:TSKgel GMHHR-H(20)2本
ガードカラム:TSKgel HXL-H
検出器:示差屈折計
標準ポリスチレンの重量平均分子量:1万~2000万(東ソー株式会社製) Sample concentration: 0.5% by mass (tetrahydrofuran solution)
Sample injection volume: 100 μl
Eluent: Tetrahydrofuran Flow rate: 1.0 ml / min Measuring temperature: 40 ° C
This column: TSKgel GMHHR-H (20) 2 Guard column: TSKgel HXL-H
Detector: Differential refractometer Weight average molecular weight of standard polystyrene: 10,000 to 20 million (manufactured by Tosoh Corporation)
本発明の粘着テープは、例えば前記支持体(A)の少なくとも一方の面(a)側に、前記粘着剤を間欠状に塗布し乾燥等させ粘着部(B)を形成することによって製造することができる。 [Production method of adhesive tape]
The pressure-sensitive adhesive tape of the present invention is produced, for example, by applying the pressure-sensitive adhesive intermittently on at least one surface (a) side of the support (A) and drying it to form a pressure-sensitive adhesive part (B). Can do.
携帯電子端末等の電子機器には、使用により熱を発する部材が搭載されたものが多い。発熱部材としては、例えば充電池、回路基板等が挙げられる。 (Use for fixing heat dissipation sheet)
Many electronic devices such as portable electronic terminals are equipped with a member that generates heat when used. Examples of the heat generating member include a rechargeable battery and a circuit board.
磁性シートは、電子機器を構成する部材から発せられた電磁波の外部への漏えいを遮断したり、外部で発生した電磁波が電子機器に影響を与えることを防止することを目的として、電子機器の内部に貼付されていることが多い。 (Use for fixing magnetic sheets)
The magnetic sheet is used to block the leakage of electromagnetic waves emitted from the members constituting the electronic device to the outside, and to prevent the electromagnetic waves generated outside from affecting the electronic device. It is often affixed to.
n-ブチルアクリレート97.98質量部と、アクリル酸2質量部と、4-ヒドロキシブチルアクリレート0.02質量部とを、アゾビスイソブチロニトリル0.2質量部を重合開始剤として、酢酸エチル溶液中で、80℃で8時間溶液重合させることによって、重量平均分子量90万のアクリル重合体を得た。 (Preparation Example 1) Adhesive a
Ethyl acetate using 97.98 parts by mass of n-butyl acrylate, 2 parts by mass of acrylic acid, 0.02 parts by mass of 4-hydroxybutyl acrylate, 0.2 parts by mass of azobisisobutyronitrile as a polymerization initiator An acrylic polymer having a weight average molecular weight of 900,000 was obtained by solution polymerization in solution at 80 ° C. for 8 hours.
n-ブチルアクリレート97.98質量部と、アクリル酸2質量部と、4-ヒドロキシブチルアクリレート0.02質量部とを、アゾビスイソブチロニトリル0.3質量部を重合開始剤として、酢酸エチル溶液中で、90℃で6時間溶液重合させることによって、重量平均分子量50万のアクリル重合体を得た。 (Preparation Example 2) Adhesive b
Ethyl acetate using 97.98 parts by mass of n-butyl acrylate, 2 parts by mass of acrylic acid, 0.02 parts by mass of 4-hydroxybutyl acrylate, 0.3 parts by mass of azobisisobutyronitrile as a polymerization initiator An acrylic polymer having a weight average molecular weight of 500,000 was obtained by solution polymerization in solution at 90 ° C. for 6 hours.
n-ブチルアクリレート97.98質量部と、アクリル酸2質量部と、4-ヒドロキシブチルアクリレート0.02質量部とを、アゾビスイソブチロニトリル0.3質量部を重合開始剤として、酢酸エチル溶液中で、90℃で6時間溶液重合させることによって、重量平均分子量50万のアクリル重合体を得た。 (Preparation Example 3) Adhesive c
Ethyl acetate using 97.98 parts by mass of n-butyl acrylate, 2 parts by mass of acrylic acid, 0.02 parts by mass of 4-hydroxybutyl acrylate, 0.3 parts by mass of azobisisobutyronitrile as a polymerization initiator An acrylic polymer having a weight average molecular weight of 500,000 was obtained by solution polymerization in solution at 90 ° C. for 6 hours.
n-ブチルアクリレート97.98質量部と、アクリル酸2質量部と、4-ヒドロキシブチルアクリレート0.02質量部とを、アゾビスイソブチロニトリル0.3質量部を重合開始剤として、酢酸エチル溶液中で、90℃で6時間溶液重合させることによって、重量平均分子量50万のアクリル重合体を得た。 (Preparation Example 4) Adhesive d
Ethyl acetate using 97.98 parts by mass of n-butyl acrylate, 2 parts by mass of acrylic acid, 0.02 parts by mass of 4-hydroxybutyl acrylate, 0.3 parts by mass of azobisisobutyronitrile as a polymerization initiator An acrylic polymer having a weight average molecular weight of 500,000 was obtained by solution polymerization in solution at 90 ° C. for 6 hours.
n-ブチルアクリレート96.4質量部と、アクリル酸3.5質量部と、4-ヒドロキシ-エチルアクリレート0.1質量部とを、アゾビスイソブチロニトリル0.2質量部を重合開始剤として、酢酸エチル溶液中で、80℃で8時間溶液重合させることによって、重量平均分子量80万のアクリル重合体を得た。 (Preparation Example 5) Adhesive e
96.4 parts by mass of n-butyl acrylate, 3.5 parts by mass of acrylic acid, 0.1 part by mass of 4-hydroxy-ethyl acrylate, 0.2 part by mass of azobisisobutyronitrile as a polymerization initiator Then, an acrylic polymer having a weight average molecular weight of 800,000 was obtained by solution polymerization in an ethyl acetate solution at 80 ° C. for 8 hours.
n-ブチルアクリレート44.9質量部と、2-エチルヘキシルアクリレート50質量部と、酢酸ビニル3質量部と、アクリル酸2質量部と、4-ヒドロキシブチルアクリレート0.1質量部とを、アゾビスイソブチロニトリル0.1質量部を重合開始剤として、酢酸エチル溶液中で、70℃で10時間溶液重合させることによって、重量平均分子量80万のアクリル重合体を得た。 (Preparation Example 6) Adhesive f
44.9 parts by mass of n-butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of vinyl acetate, 2 parts by mass of acrylic acid, and 0.1 part by mass of 4-hydroxybutyl acrylate were mixed with azobisiso An acrylic polymer having a weight average molecular weight of 800,000 was obtained by performing solution polymerization at 70 ° C. for 10 hours in an ethyl acetate solution using 0.1 part by mass of butyronitrile as a polymerization initiator.
「PET25×1J0L」(ニッパ株式会社製、表面平滑なPETフィルムの表面にシリコーン系剥離処理面を有する剥離ライナーに、ロールコーターを用いて前記粘着剤aを塗工した後、100℃で1分間乾燥させることによって、厚さ1μmの粘着剤層を作製した。 Example 1
“PET25 × 1J0L” (manufactured by Nipper Co., Ltd., coated with the pressure-sensitive adhesive a using a roll coater on a release liner having a silicone release surface on the surface of a smooth PET film, and then at 100 ° C. for 1 minute. By drying, an adhesive layer having a thickness of 1 μm was produced.
粘着部(B)の形状、面積及び粘着部(B)の厚さを、表1~3に記載のものに変更したこと以外は、実施例1と同様の方法で粘着テープを作製した。 (Examples 2 to 12)
A pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the shape and area of the pressure-sensitive adhesive part (B) and the thickness of the pressure-sensitive adhesive part (B) were changed to those shown in Tables 1 to 3.
「PET25×1J0L」(ニッパ株式会社製、表面平滑なPETフィルムの表面にシリコーン系剥離処理面を有する剥離ライナー)に、グラビアコーターを用いて前記粘着剤aをドット印刷し、100℃で1分間乾燥させることによって、図1に示す略ひし形形状(粘着テープの流れ方向に向いた角部の角度は60°)の厚さ3μmの粘着部を形成した。なお、前記粘着部のうち、任意の粘着部とそれに近接する粘着部との距離は、0.1mmであった。 (Example 13)
“PET25 × 1J0L” (manufactured by Nipper Co., Ltd., release liner having a silicone-based release treatment surface on the surface of a smooth PET film) is dot-printed with the adhesive a using a gravure coater, and 100 ° C. for 1 minute. By drying, an adhesive part having a thickness of 3 μm and a substantially rhombus shape (the angle of the corner part facing the flow direction of the adhesive tape was 60 °) shown in FIG. 1 was formed. In addition, the distance of the arbitrary adhesion part and the adhesion part adjacent to it was 0.1 mm among the said adhesion parts.
粘着剤aの代わりに粘着剤bを用いたこと以外は、実施例1と同様の方法で粘着テープを得た。 (Example 14)
An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive b was used instead of the adhesive a.
粘着剤aの代わりに粘着剤cを用いたこと以外は、実施例1と同様の方法で粘着テープを得た。 (Example 15)
An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive c was used instead of the adhesive a.
粘着剤aの代わりに粘着剤dを用いたこと以外は、実施例1と同様の方法で粘着テープを得た。 (Example 16)
An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive d was used instead of the adhesive a.
粘着剤aの代わりに粘着剤eを用いたこと以外は、実施例1と同様の方法で粘着テープを得た。 (Example 17)
An adhesive tape was obtained in the same manner as in Example 1 except that adhesive e was used instead of adhesive a.
粘着剤aの代わりに粘着剤fを用いたこと以外は、実施例1と同様の方法で粘着テープを得た。 (Example 18)
An adhesive tape was obtained in the same manner as in Example 1 except that the adhesive f was used in place of the adhesive a.
粘着部(B)の形状、面積及び粘着部(B)の厚さを、表4及び5に記載のものに変更したこと以外は、実施例1と同様の方法で粘着テープを作成した。また、実施例20で得た粘着テープの略円形状の粘着部を有する面を、光学顕微鏡を用い倍率200倍で観察した(図6)。 (Examples 19 to 25)
An adhesive tape was prepared in the same manner as in Example 1 except that the shape and area of the adhesive part (B) and the thickness of the adhesive part (B) were changed to those shown in Tables 4 and 5. Moreover, the surface which has a substantially circular adhesion part of the adhesive tape obtained in Example 20 was observed at 200-times multiplication factor using the optical microscope (FIG. 6).
「PET25×1J0L」(ニッパ株式会社製、表面平滑なPETフィルムの表面にシリコーン系剥離処理面を有する剥離ライナー)に、ロールコーターを用いて前記粘着剤aを塗工した後、100℃で1分間乾燥させることによって、厚さ1μmの粘着剤層を作製した。 (Comparative Example 1)
After applying the pressure-sensitive adhesive a to “PET25 × 1J0L” (manufactured by Nipper Co., Ltd., release liner having a silicone-type release treatment surface on the surface of a smooth PET film) using a roll coater, 1 at 100 ° C. By drying for 1 minute, an adhesive layer having a thickness of 1 μm was produced.
「PET25×1J0L」(ニッパ株式会社製、表面平滑なPETフィルムの表面にシリコーン系剥離処理面を有する剥離ライナー)に、ロールコーターを用いて前記粘着剤aを塗工した後、100℃で1分間乾燥させることによって、厚さ2μmの粘着剤層を作製した。
次に、前記粘着剤層を、支持体である「K100-2.0W」(三菱樹脂株式会社製、ポリエステルフィルム、厚さ2μm)の片面に転写することによって片面テープを得た。
さらに、片面テープの支持体上にロールコーターを用いて前記粘着剤aを塗工した後、100℃で1分間乾燥させることによって、厚さ2μmの粘着剤層を作製した。粘着剤層を前記支持体に転写する際に使用したラミネーターの圧力は線圧3N/mmとした。
その後、格子状のエンボス処理をした剥離紙を粘着剤層に貼りあわせ、40℃で2日養生することによって、粘着剤層の表面に図7に示すような凹凸形状を有する粘着剤層を備えた粘着テープを得た。図7は、比較例2で得た粘着テープの粘着剤層の表面を、光学顕微鏡を用い倍率100倍で観察したものである。 (Comparative Example 2)
After applying the pressure-sensitive adhesive a to “PET25 × 1J0L” (manufactured by Nipper Co., Ltd., release liner having a silicone-type release treatment surface on the surface of a smooth PET film) using a roll coater, 1 at 100 ° C. By drying for 2 minutes, a pressure-sensitive adhesive layer having a thickness of 2 μm was produced.
Next, the pressure-sensitive adhesive layer was transferred onto one side of “K100-2.0W” (Mitsubishi Resin Co., Ltd., polyester film, thickness 2 μm) as a support to obtain a single-sided tape.
Further, the pressure-sensitive adhesive a was coated on a single-sided tape support using a roll coater, and then dried at 100 ° C. for 1 minute to prepare a pressure-sensitive adhesive layer having a thickness of 2 μm. The pressure of the laminator used when transferring the pressure-sensitive adhesive layer to the support was set to a linear pressure of 3 N / mm.
Thereafter, the release paper subjected to the grid-like embossing treatment is bonded to the pressure-sensitive adhesive layer and cured at 40 ° C. for 2 days to provide a pressure-sensitive adhesive layer having an uneven shape as shown in FIG. 7 on the surface of the pressure-sensitive adhesive layer. An adhesive tape was obtained. FIG. 7 shows the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape obtained in Comparative Example 2 observed using an optical microscope at a magnification of 100 times.
「PET25×1J0L」(ニッパ株式会社製、表面平滑なPETフィルムの表面にシリコーン系剥離処理面を有する剥離ライナー)に、ロールコーターを用いて前記粘着剤aを塗工した後、100℃で1分間乾燥させることによって、厚さ2μmの粘着剤層を作製した。
次に、前記粘着剤層を、支持体である「K100-2.0W」(三菱樹脂株式会社製、ポリエステルフィルム、厚さ2μm)の一方の面に転写することによって片面テープを得た。
次に、「PSM100GS」(リンテック株式会社製、サンドマット処理されたPETフィルムの表面にシリコーン系剥離処理面を有する剥離ライナー、中心線平均表面粗さRa=0.36μm)に、ロールコーターを用いて前記粘着剤aを塗工した後、100℃で1分間乾燥させることによって、厚さ2μmの粘着剤層を作製した。次に、前記粘着剤層を、前記支持体の他方の面に転写することによって、総厚さ6μmの粘着テープを得た。粘着剤層を前記支持体に転写する際に使用したラミネーターの圧力は線圧3N/mmとした。 (Comparative Example 3)
After applying the pressure-sensitive adhesive a to “PET25 × 1J0L” (manufactured by Nipper Co., Ltd., release liner having a silicone-type release treatment surface on the surface of a smooth PET film) using a roll coater, 1 at 100 ° C. By drying for 2 minutes, a pressure-sensitive adhesive layer having a thickness of 2 μm was produced.
Next, the pressure-sensitive adhesive layer was transferred onto one surface of “K100-2.0W” (Mitsubishi Resin Co., Ltd., polyester film, thickness 2 μm) as a support to obtain a single-sided tape.
Next, a roll coater is used for “PSM100GS” (manufactured by Lintec Corporation, a release liner having a silicone-based release treatment surface on the surface of a PET film that has been sand-matted, centerline average surface roughness Ra = 0.36 μm). After coating the pressure-sensitive adhesive a, the pressure-sensitive adhesive layer having a thickness of 2 μm was prepared by drying at 100 ° C. for 1 minute. Next, the pressure-sensitive adhesive layer was transferred to the other surface of the support to obtain a pressure-sensitive adhesive tape having a total thickness of 6 μm. The pressure of the laminator used when transferring the pressure-sensitive adhesive layer to the support was set to a linear pressure of 3 N / mm.
前記粘着剤a~fを、それぞれ剥離ライナーの離型処理面に、乾燥後の厚さが50μmになるように、前記粘着剤を塗工したものを、100℃の環境下で3分間乾燥した後、40℃の環境下で2日間エージングさせることによって粘着剤層を形成した。前記粘着剤層を縦50mm及び横50mmの正方形に裁断したものを試験片とした。 (Measurement method of gel fraction of adhesive part)
Each of the pressure-sensitive adhesives a to f was coated on the release treatment surface of the release liner so that the thickness after drying was 50 μm, and dried for 3 minutes in an environment of 100 ° C. Thereafter, an adhesive layer was formed by aging in an environment of 40 ° C. for 2 days. A test piece was prepared by cutting the pressure-sensitive adhesive layer into a square of 50 mm length and 50 mm width.
前記粘着剤a~fを、それぞれ剥離ライナーの表面に、乾燥厚さ50μmとなるよう塗工し乾燥させることによって粘着剤層を形成し、40℃の環境下に2日間養生した。前記養生後の粘着剤層を総厚さが2mmとなるまで重ねあわせたものを試験片とした。 (Measurement of dynamic viscoelasticity)
The pressure-sensitive adhesives a to f were each applied to the surface of the release liner so as to have a dry thickness of 50 μm and dried to form a pressure-sensitive adhesive layer, which was then cured in an environment of 40 ° C. for 2 days. A test piece was prepared by laminating the adhesive layer after curing until the total thickness was 2 mm.
縦100mm×横100mm×厚さ25μmのグラファイトシートの一方の面に、縦104mm×横104mm×厚さ5μmの片面粘着テープ「IL-05G」(DIC株式会社製)を貼り合せ、前記グラファイトシートの他方の面に、実施例及び比較例で得た粘着テープを縦104mm×横104mmの大きさに裁断したものを貼り合わせた。 (Production of graphite composite sheet)
A single-sided adhesive tape “IL-05G” (manufactured by DIC Corporation) having a length of 104 mm, a width of 104 mm and a thickness of 5 μm is bonded to one side of a graphite sheet having a length of 100 mm × width of 100 mm × thickness of 25 μm. On the other surface, the adhesive tapes obtained in Examples and Comparative Examples were cut into a size of 104 mm length × 104 mm width, and bonded together.
実施例及び比較例で得た粘着テープを20mm幅に切断し、その片側の粘着剤層を、厚さ25μmのポリエチレンテレフタレートフィルムで裏打ちしたものを試験片とした。前記裏打ちは、表面が平滑な粘着剤層の表面に対して行い、本発明の構成要件である粘着部(B)に相当する粘着剤層に対して行わないようにした。 (Adhesive strength (1 hour after application))
The pressure-sensitive adhesive tapes obtained in Examples and Comparative Examples were cut into a width of 20 mm, and a test piece was prepared by backing one side of the pressure-sensitive adhesive layer with a polyethylene terephthalate film having a thickness of 25 μm. The backing is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a constituent of the present invention.
実施例及び比較例で得た粘着テープを20mm幅に切断し、その片側の粘着剤層を、厚さ25μmのポリエチレンテレフタレートフィルムで裏打ちしたものを試験片とした。前記裏打ちは、表面が平滑な粘着剤層の表面に対して行い、本発明の構成要件である粘着部(B)に相当する粘着剤層に対して行わないようにした。 (Adhesive strength (24 hours after application))
The pressure-sensitive adhesive tapes obtained in Examples and Comparative Examples were cut into a width of 20 mm, and a test piece was prepared by backing one side of the pressure-sensitive adhesive layer with a polyethylene terephthalate film having a thickness of 25 μm. The backing is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a constituent of the present invention.
実施例及び比較例で得た粘着テープを20mm幅に切断し、その片側の粘着剤層を、厚さ50μmのアルミ箔で裏打ちしたものを試験片とした。前記裏打ちは、表面が平滑な粘着剤層の表面に対して行い、本発明の構成要件である粘着部(B)に相当する粘着剤層に対して行わないようにした。 (Holding power)
The pressure-sensitive adhesive tapes obtained in Examples and Comparative Examples were cut to a width of 20 mm, and a test piece was prepared by backing the pressure-sensitive adhesive layer on one side with an aluminum foil having a thickness of 50 μm. The backing is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a constituent of the present invention.
グラファイト複合シートの剥離ライナーを剥離し、23℃及び50%RH雰囲気下、前記粘着部の表面に縦200mm×横200mmのアルミニウム板を置き、アルミニウム板の上から10Nを荷重した状態で5秒放置することによって仮貼付物を得た。 [Evaluation Method for Ease of Bubble Removal 1 (Ease of Removal)]
The release liner of the graphite composite sheet is peeled off, and an aluminum plate measuring 200 mm in length and 200 mm in width is placed on the surface of the adhesive part in an atmosphere of 23 ° C. and 50% RH, and left for 5 seconds under a load of 10 N from the top of the aluminum plate. By doing so, a temporary patch was obtained.
グラファイト複合シートの剥離ライナーを剥離することによって現れた粘着部の表面に、「PET25X1J0L」(ニッパ株式会社製、離型処理面が平滑な離型ライナー、Ra=0.03μm)を貼付し、ラミネータ―を用いて線圧3N/mmの条件で加圧した後、23℃の環境下に1日放置した。 [Evaluation Method for Ease of Bubble Removal 2 (Ease of Removal)]
A “PET25X1J0L” (manufactured by Nipper Co., Ltd., release liner with a smooth release treatment surface, Ra = 0.03 μm) is pasted on the surface of the adhesive part that appears by peeling off the release liner of the graphite composite sheet, and a laminator -Was used under the condition of a linear pressure of 3 N / mm and then left in an environment at 23 ° C for 1 day.
前記グラファイト複合シートを構成する片面粘着テープ「IL-05G」(DIC株式会社製)の表面に、微粘着フィルム(厚さ75μmのPETフィルムの片面にシリコーン系微粘着層を有するもの:粘着力=0.05N/20mm)を貼り合せた積層品を、アルミニウム板に載置し、2kgローラーでその表面を1往復させることによってそれらを貼付した。 (Whether or not the graphite composite sheet floats when the slightly adhesive film is peeled off)
On the surface of the single-sided adhesive tape “IL-05G” (manufactured by DIC Corporation) constituting the graphite composite sheet, a fine-adhesive film (with a silicone-based fine-adhesive layer on one side of a 75 μm-thick PET film: adhesive strength = The laminated product with 0.05 N / 20 mm) was placed on an aluminum plate and pasted by reciprocating the surface once with a 2 kg roller.
前記グラファイト複合シートをアルミニウム板に貼付し、蛍光灯下で、前記グラファイト複合シートの上面30cmの位置から観察したときに、粘着部の形状(上記略ひし形状、略丸形状等)を視認できるか否かを基準に評価した。前記粘着部の形状がまったく視認できなかったものを「◎」、前記形状の一部をわずかに視認できたものを「○」、前記形状を明確に視認で来たものを「×」と評価した。なお、比較例1で示すように支持体の全面に粘着剤を塗布し粘着剤層が形成されたものについては、粘着部が所定の形状を形成しておらず、したがってその形状を上記方法で視認できないことから、評価せず「-」とした。
[粘着部の個数]
粘着部の個数は、粘着テープの任意の範囲(流れ方向5cm及び幅5cmの正方形)または(流れ方向1cm及び幅方向1cmの正方形)の範囲を電子顕微鏡で観察し数えることによって求めた。 (Appearance evaluation method)
When the graphite composite sheet is affixed to an aluminum plate and observed from a position 30 cm above the top of the graphite composite sheet under a fluorescent lamp, can the shape of the adhesive part (such as the above approximate rhombus shape, substantially round shape) be visually recognized? Evaluation was based on whether or not. The case where the shape of the adhesive part was not visible at all was evaluated as “◎”, the part of the shape slightly visible as “◯”, and the case where the shape was clearly visible was evaluated as “X”. did. In addition, as shown in Comparative Example 1, in the case where the pressure-sensitive adhesive was applied to the entire surface of the support and the pressure-sensitive adhesive layer was formed, the pressure-sensitive adhesive portion did not form a predetermined shape. Since it was not visually recognized, it was evaluated as “-” without evaluation.
[Number of adhesive parts]
The number of adhesive parts was determined by observing and counting an arbitrary range (5 cm in the flow direction and 5 cm width) or (a square in the flow direction 1 cm and 1 cm width) range of the adhesive tape.
2 粘着部
3 粘着テープ
4 グラファイトシート
5 片面粘着テープ
6 両面粘着テープ DESCRIPTION OF SYMBOLS 1 Support body 2 Adhesive part 3 Adhesive tape 4
Claims (12)
- 支持体(A)の少なくとも一方の面(a)側に2以上の粘着部(B)を有する粘着テープであって、前記2以上の粘着部(B)の間には粘着部(B)を有しない領域が存在し、前記領域が前記粘着テープの端部に通じたものであることを特徴とする粘着テープ。 An adhesive tape having two or more adhesive parts (B) on at least one surface (a) side of the support (A), wherein the adhesive part (B) is interposed between the two or more adhesive parts (B). There is a region that does not have, and the region communicates with an end of the adhesive tape.
- 前記支持体(A)の一方の面(a)側から前記粘着部(B)を観察した際の前記粘着部(B)の形状が、略円形状、略四角形状または略六角形状である請求項1に記載の粘着テープ。 The shape of the adhesive part (B) when the adhesive part (B) is observed from the one surface (a) side of the support (A) is a substantially circular shape, a substantially square shape, or a substantially hexagonal shape. Item 2. The pressure-sensitive adhesive tape according to item 1.
- 前記2以上の粘着部(B)から選択される任意の粘着部(b1)と、前記粘着部(b1)に近接する粘着部(b2)との距離が0.5mm以下である請求項1または2に記載の粘着テープ。 The distance between an arbitrary adhesive part (b1) selected from the two or more adhesive parts (B) and an adhesive part (b2) adjacent to the adhesive part (b1) is 0.5 mm or less. 2. The adhesive tape according to 2.
- 前記支持体(A)の一方の面(a)の面積に占める、前記粘着部(B)を有する領域の割合が10%~99%である請求項1~3のいずれか1項に記載の粘着テープ。 The ratio of the region having the adhesive part (B) to the area of the one surface (a) of the support (A) is 10% to 99%. Adhesive tape.
- 前記粘着テープの流れ方向1cm及び幅方向1cmの範囲に、前記粘着部(B)が120個~2000個存在する請求項1~4のいずれか1項に記載の粘着テープ。 The pressure-sensitive adhesive tape according to any one of claims 1 to 4, wherein 120 to 2000 of the pressure-sensitive adhesive portions (B) are present in a range of 1 cm in the flow direction and 1 cm in the width direction of the pressure-sensitive adhesive tape.
- 総厚さが20μm以下である請求項1~5のいずれか1項に記載の粘着テープ。 6. The pressure-sensitive adhesive tape according to claim 1, wherein the total thickness is 20 μm or less.
- 前記粘着部(B)を有する面に平滑なステンレス板を載置し、2kgローラーを用い1往復させることでそれらを圧着させ、23℃及び50%RHの条件下で1時間放置して得られた試験片を用いて測定される180°ピール接着力が2N/20mm~12N/20mmの範囲である請求項1~6のいずれか1項に記載の粘着テープ。 It is obtained by placing a smooth stainless steel plate on the surface having the adhesive part (B), reciprocating it once using a 2 kg roller, and allowing them to stand for 1 hour at 23 ° C. and 50% RH. The pressure-sensitive adhesive tape according to any one of claims 1 to 6, wherein the 180 ° peel adhesive force measured using the test piece is in the range of 2 N / 20 mm to 12 N / 20 mm.
- 発熱部材と放熱部材との貼り合わせ、または、発熱部材に接する金属部材と放熱部材との貼り合わせに使用する請求項1~7のいずれか1項に記載の粘着テープ。 The pressure-sensitive adhesive tape according to any one of claims 1 to 7, which is used for bonding a heat generating member and a heat radiating member, or for bonding a metal member in contact with the heat generating member and a heat radiating member.
- 前記放熱部材がグラファイトシートまたはグラフェンシートである請求項8に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 8, wherein the heat radiating member is a graphite sheet or a graphene sheet.
- 放熱部材の一方の面側に任意の片面粘着テープが貼付され、前記放熱部材の他方の面側に請求項1~8のいずれか1項に記載の粘着テープが貼付された放熱シート。 9. A heat radiation sheet in which an arbitrary single-sided adhesive tape is affixed to one surface side of the heat dissipation member, and the adhesive tape according to any one of claims 1 to 8 is affixed to the other surface side of the heat dissipation member.
- 発熱部材、または、発熱部材に接する金属部材に、請求項10に記載の放熱シートが貼付された構成を有する電子機器であって、前記放熱シートの前記粘着部(B)を有する面が、前記発熱部材または前記金属部材に貼付された構成を有することを特徴とする電子機器。 It is an electronic device which has the composition by which the heat dissipation sheet according to claim 10 is stuck to the heat generating member or the metal member in contact with the heat generating member, and the surface having the adhesive portion (B) of the heat dissipation sheet is An electronic device having a structure attached to a heat generating member or the metal member.
- 支持体の少なくとも一方の面(a)に、グラビア塗工方法またはスロットダイ塗工方法で粘着剤を塗工することによって、略円形状、略四角形状または略六角形状の2以上の粘着部(B)形成することを特徴とする粘着テープの製造方法。 By applying an adhesive to at least one surface (a) of the support by a gravure coating method or a slot die coating method, two or more adhesive portions having a substantially circular shape, a substantially rectangular shape or a substantially hexagonal shape ( B) A method for producing a pressure-sensitive adhesive tape characterized by forming.
Priority Applications (3)
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KR1020187001306A KR102025167B1 (en) | 2015-08-06 | 2016-08-02 | Manufacturing method of adhesive tape, heat dissipation sheet, electronic equipment and adhesive tape |
JP2017533079A JPWO2017022749A1 (en) | 2015-08-06 | 2016-08-02 | Adhesive tape, heat dissipation sheet, electronic device, and method for producing adhesive tape |
CN201680042385.5A CN107849398B (en) | 2015-08-06 | 2016-08-02 | Adhesive tape, heat sink, electronic device, and method for manufacturing adhesive tape |
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JP2015-156059 | 2015-08-06 | ||
JP2015156059 | 2015-08-06 | ||
JP2015-245279 | 2015-12-16 | ||
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KR (1) | KR102025167B1 (en) |
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JP2019137715A (en) * | 2018-02-06 | 2019-08-22 | リンテック株式会社 | Adhesive sheet and graphite sheet laminate |
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TWI679123B (en) | 2018-05-29 | 2019-12-11 | 奇鋐科技股份有限公司 | A attached structure |
CN108531094B (en) * | 2018-05-30 | 2021-02-05 | 奇鋐科技股份有限公司 | Attaching structure |
JP7332147B2 (en) | 2019-08-26 | 2023-08-23 | 株式会社Joled | DISPLAY PANEL AND METHOD OF MANUFACTURING DISPLAY PANEL |
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Also Published As
Publication number | Publication date |
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JP2018127634A (en) | 2018-08-16 |
CN107849398A (en) | 2018-03-27 |
JPWO2017022749A1 (en) | 2018-02-22 |
KR102025167B1 (en) | 2019-09-25 |
CN107849398B (en) | 2020-12-22 |
JP6601522B2 (en) | 2019-11-06 |
KR20180020218A (en) | 2018-02-27 |
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