WO2014156642A1 - Adhesive tape and electronic equipment - Google Patents
Adhesive tape and electronic equipment Download PDFInfo
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- WO2014156642A1 WO2014156642A1 PCT/JP2014/056467 JP2014056467W WO2014156642A1 WO 2014156642 A1 WO2014156642 A1 WO 2014156642A1 JP 2014056467 W JP2014056467 W JP 2014056467W WO 2014156642 A1 WO2014156642 A1 WO 2014156642A1
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- adhesive tape
- pressure
- sensitive adhesive
- foam
- thickness
- Prior art date
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/08—Polyesters modified with higher fatty oils or their acids, or with resins or resin acids
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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
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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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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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
- C09J7/22—Plastics; Metallised plastics
- C09J7/26—Porous or cellular plastics
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
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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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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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
- C09J2423/00—Presence of polyolefin
- C09J2423/006—Presence of polyolefin in the substrate
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
Definitions
- the present invention relates to an adhesive tape used for fixing a touch panel device having a touch feedback function.
- a so-called touch feedback function is known in which it is possible to easily and clearly confirm whether or not an input operation performed on the touch panel is accepted by an electronic device.
- touch feedback function for example, when an electronic device accepts an operation on the touch panel, the electronic device or the touch panel unit vibrates, and the vibration causes the operator to recognize that the input operation has been accepted (tactile sense). (Feedback function) has been studied (see, for example, Patent Documents 1 and 2).
- a vibration generation source such as a piezoelectric element (also referred to as a piezo element), a vibration motor, or a linear vibration actuator is attached to a touch panel or a display module with a touch panel function, and the entire touch panel device or a part thereof.
- a vibration generation source such as a piezoelectric element (also referred to as a piezo element), a vibration motor, or a linear vibration actuator is attached to a touch panel or a display module with a touch panel function, and the entire touch panel device or a part thereof.
- This function can directly transmit vibration to the fingertip that touches the surface of the touch panel to operate the touch panel, etc., and gives the operator a feel similar to that of clicking when a conventional button is pressed. There is an advantage that you can.
- the adhesive tape usually used for fixing to the touch panel unit and the case is very slightly corresponding to the indentation displacement of the touch panel part when the surface of the touch panel part is pushed in very slightly. Since it does not have the characteristic of being displaced (compressed), there is a case where vibrations corresponding to the pressing cannot be given to the operator.
- vibrations generated by detecting the pressing are transmitted to the fingertips as well as the touch panel portion through the adhesive tape.
- the transmission of the vibration is inhibited or the vibration is applied to the touch panel.
- the opposite side (case side) of the part There is a problem that it may be transmitted to the opposite side (case side) of the part.
- the problem to be solved by the present invention is provided with a so-called touch feedback characteristic that is displaceable (compressible) and does not hinder the transmission of vibration to the touch panel part and the fingertip in response to the pressing of the touch panel part. It is to provide an adhesive tape.
- the second problem to be solved by the present invention is excellent in the above-mentioned touch feedback characteristics, impact resistance at a level that can be used for manufacturing the mobile device, and followability to the uneven surface of the adherend. Is to provide an adhesive tape.
- the present inventor is an adhesive tape having a foam base material layer and an adhesive layer, and is used for fixing a touch panel device having a touch feedback function that senses contact of an object and gives tactile feedback. It has been found that the above-mentioned problems can be solved if the pressure-sensitive adhesive tape has a displacement amount of 130 ⁇ m or more when compressed in the direction with a compressive load of 5 N / cm 2 .
- the pressure-sensitive adhesive tape of the present invention has a so-called touch feedback characteristic that can be displaced (compressible) in response to the pressing of the touch panel portion and does not hinder the transmission of vibration to the touch panel portion and the fingertip.
- the touch panel device having a feedback function can be used for fixing to a casing.
- the adhesive tape of the present invention is excellent in impact resistance, follow-up to unevenness on the surface of the adherend, and peeling resistance in addition to the touch feedback characteristics described above. It can be suitably used for the manufacture of portable electronic devices such as smartphones, tablet computers, notebook computers, and game machines, which are increasingly screened and have a high demand for impact resistance.
- the pressure-sensitive adhesive tape of the present invention has a foam base material layer and a pressure-sensitive adhesive layer, and has a displacement amount of 130 ⁇ m or more when compressed with a compression load of 5 N / cm 2 in the thickness direction. is there.
- the adhesive tape can be used exclusively for fixing a touch panel device having a touch feedback function.
- the adhesive tape one having a displacement of 130 ⁇ m or more when compressed with a load of 5 N / cm 2 in the thickness direction is used.
- the amount of displacement is more preferably 140 ⁇ m or more, and further preferably 150 ⁇ m or more, in order to impart even more excellent touch feedback characteristics.
- the upper limit of the displacement amount is not particularly limited, but is preferably 400 ⁇ m or less, and 300 ⁇ m or less is a float or the like caused by excessive deformation of the adhesive tape, such as a part fixed by the adhesive tape. It is preferable because peeling can be prevented.
- the amount of displacement when compressed with the compression load of 5 N / cm 2 indicates a value measured by the following methods (1) and (2).
- (1) At 23 ° C., apply a 2 cm square pressure-sensitive adhesive tape to a smooth aluminum plate having a thickness of 9 mm and a 10 cm square, and leave it at 23 ° C. for 24 hours to obtain a test piece.
- (2) Next, with a tensile tester equipped with a stainless steel probe having a diameter of 7 mm, the displacement amount when the center of the surface of the adhesive tape is compressed with a force of 5 N / cm 2 at a speed of 0.5 mm / min. Ask.
- the amount of displacement refers to the distance between the reference surface and the deepest depth when pressed in the thickness direction with the smooth surface of the pressure-sensitive adhesive tape before compression as the reference surface.
- the amount of displacement per unit thickness is 0.13 or more. It is preferable to use, and it is more preferable to use what is 0.15 or more.
- the adhesive tape preferably has a loss tangent (tan ⁇ ) peak value of 0.53 or less at a frequency of 1 Hz, preferably 0.1 to 0.53. Therefore, it is preferable for imparting more excellent touch feedback characteristics.
- a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan Co., Ltd.)
- a test piece is sandwiched between parallel disks with a diameter of 8 mm, which is the measuring part of the machine, and the loss tangent (tan ⁇ ) from -50 ° C. to 150 ° C. is measured at a frequency of 1 Hz and a heating rate of 2 ° C./min. Ask. If there are two or more maximum values, the one with the larger value is adopted.
- the surface adhesive strength measured under the following measurement conditions is preferably 90 N / 4 cm 2 or more, and more preferably 130 N / 4 cm 2 or more.
- the measurement conditions of the surface adhesive strength are as follows (3) to (5).
- (3) Two double-sided pressure-sensitive adhesive tapes having a width of 5 mm and a length of 4 cm are attached in parallel to an acrylic plate having a thickness of 2 mm and a square of 5 cm at 23 ° C.
- the acrylic plate with the double-sided adhesive tape created in (3) is acrylic on a rectangular smooth ABS plate having a thickness of 2 mm, a width of 10 cm and a length of 15 cm with a 1 cm diameter hole in the center. Affixed so that the center of the plate and the center of the acrylonitrile-butadiene-styrene plate (ABS plate) coincide with each other, press once with a 2 kg roller, and let stand at 23 ° C.
- ABS plate acrylonitrile-butadiene-styrene plate
- the thickness of the adhesive tape may be appropriately adjusted depending on the mode of use, but is preferably 350 ⁇ m to 2000 ⁇ m.
- the adhesive tape is used for fixing electronic device parts, particularly for fixing small and thin portable electronic device parts, a relatively thin adhesive tape is required. Therefore, the adhesive tape has a thickness of 400 ⁇ m to 1900 ⁇ m. It is preferable to use one having a thickness of 400 ⁇ m to 1600 ⁇ m, which can be suitably applied to a thin and small portable electronic device and can provide a good waterproof function. .
- the pressure-sensitive adhesive tape of the present invention can be produced by laminating a foam base material and a pressure-sensitive adhesive layer.
- the said foam base material comprises the foam base material layer of the adhesive tape of this invention.
- the foam base material it is preferable to use one having a thickness of 300 ⁇ m or more, more preferably one having a thickness of 350 ⁇ m to 1800 ⁇ m, and one having a thickness of 450 ⁇ m to 1500 ⁇ m. It is more preferable to use it in order to obtain a pressure-sensitive adhesive tape that can fix various components satisfactorily and has a more suitable touch feedback characteristic. Further preferred. When manufacturing the adhesive tape which has a 2 or more foam base material layer as said adhesive tape, it is preferable that the sum total of the thickness of the said foam base material layer is the thickness of the said range.
- the foam substrate it is easy to adjust the amount of compression displacement of the adhesive tape to a suitable range, and more suitable touch feedback characteristics, excellent impact resistance, and excellent adhesion to the adherend.
- the apparent density is a value calculated by preparing a foam base material cut into a 4 cm ⁇ 5 cm rectangle according to JIS K6767 for about 15 cm 3 minutes and measuring its mass.
- the 25% compressive strength of the foam base material is preferably 10 kPa to 300 kPa, more preferably 20 kPa to 200 kPa, further preferably 20 kPa to 150 kPa, and more preferably 20 kPa to 100 kPa. It is more preferable because an adhesive tape having both more suitable touch feedback characteristics and followability to unevenness of the adherend surface can be obtained.
- test piece for 25% compressive strength, in accordance with JISK6767, prepare a test piece in which a foam base material cut into 25 mm squares is stacked to a thickness of about 10 mm, and use a stainless steel plate with a larger area than the test piece. It is a value obtained by measuring the strength when the test piece is compressed about 2.5 mm (25% of the original thickness) at 23 ° C. at a speed of 10 mm / min.
- the foam base material it is preferable to use those whose average cell diameter in the flow direction and width direction is adjusted in the range of 10 ⁇ m to 700 ⁇ m, and those adjusted in the range of 30 ⁇ m to 500 ⁇ m are used. It is more preferable to use the one adjusted to the range of 50 ⁇ m to 400 ⁇ m, and it is easy to secure a certain number of closed cells per unit width of the foam base material, and the pressure-sensitive adhesive tape is displaced when compressed. Since it is easy to make the amount into a suitable range and it is easy to obtain a pressure-sensitive adhesive tape having more excellent adhesion and impact resistance, it is further preferable.
- the ratio of the average bubble diameter in the flow direction and the width direction is not particularly limited, but is preferably 0.25 to 4 times, preferably 0.33 to It is more preferably 3 times, more preferably 0.5 to 2.3 times, and particularly preferably 0.7 to 1.3 times. Within the above ratio range, variations in flexibility and tensile strength in the flow direction and width direction of the foam substrate are unlikely to occur.
- the average cell diameter in the thickness direction of the foam substrate is preferably 10 ⁇ m to 150 ⁇ m, and more preferably 15 ⁇ m to 100 ⁇ m. By setting the average cell diameter in the thickness direction within this range, suitable followability and cushioning properties can be realized, and excellent adhesion can be easily achieved even when joining rigid bodies.
- the average cell diameter in the thickness direction is 1/2 or less, preferably 1/3 or less of the thickness of the foam base material, and the apparent density and strength in the preferable range described above are provided. Since it is easy to obtain a foam base material, it is preferable. Moreover, it is easy to ensure a suitable strength even when the displacement amount when compressed with a load of 5 N / cm 2 in the thickness direction of the obtained adhesive tape is 130 ⁇ m or more.
- the ratio of the average bubble diameter in the width direction of the foam substrate to the average bubble diameter in the thickness direction (average bubble diameter in the width direction / average bubble diameter in the thickness direction) is preferably both 1 to 15, It is more preferably 1.5 to 10, and further preferably 2 to 8.
- the average cell diameter in the width direction, flow direction, and thickness direction of the foam substrate is measured as follows. First, the foam base material is cut to about 1 cm in both the width method and the flow direction. Next, after the foam cell part was enlarged 200 times by a digital microscope (trade name “KH-7700”, manufactured by HiROX) at the center of the cut surface of the foam base material, The cross section in the width direction or the flow direction is taken so that the cross section in the width direction or the flow direction fits in the photograph over the entire length in the thickness direction of the base material.
- the cell structure of the foam base material used in the present invention is preferably a closed cell structure because water or dust from the cut surface of the foam base material can be effectively prevented.
- the shape of the bubbles forming the closed cell structure is moderate following by using closed cells with a longer average bubble size in the flow direction, width direction, or both than the average bubble size in the thickness direction of the foam. It is preferable because it has a good cushioning property.
- the foam base material used in the present invention is not particularly limited in the tensile strength in the flow direction and the width direction, but is preferably 50 N / cm 2 or more and 50 N / cm 2 to 700 N / cm 2 respectively. Is more preferable.
- the tensile elongation at the time of cutting in the tensile test is not particularly limited, but the tensile elongation in the flow direction is preferably 100% to 1200%, more preferably 200% to 1000%, and more preferably 200% to More preferably, it is 600%.
- the tensile strength in the flow direction and the width direction of the foam base material is an environment of 23 ° C. and 50% RH in accordance with JISK6767 using a sample with a marked length of 2 cm and a width of 1 cm using a Tensilon tensile tester. Below, it is the maximum intensity
- Compressive strength, density, interlayer strength, tensile strength, etc. of the foam base material can be appropriately adjusted depending on the material and foam structure of the foam base material to be used.
- foam base material examples include polyolefin-based foams, polyurethane-based foams, and acrylic-based foams obtained using polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and the like. Other rubber-based foams can be used.
- a foam base having a closed cell structure that is easy to adjust the amount of displacement within a predetermined range, and has excellent conformability to the unevenness of the adherend surface, buffer absorbability, and the like. Since it is easy to produce a material, it is preferable to use a polyolefin-based foam.
- the polyolefin-based foam base material using the polyolefin-based resin it is possible to use a foam base material obtained using a polyethylene-based resin with a relatively uniform thickness and a more suitable flexibility. It is preferable because it has the characteristics.
- the content of the polyethylene resin contained in the polyolefin resin is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 60% by mass or more, and 100% by mass. % Is particularly preferred.
- polyethylene resin examples include linear low density polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene, and ethylene- ⁇ containing 50% by weight or more of ethylene.
- An olefin copolymer, an ethylene-vinyl acetate copolymer containing 50% by weight or more of ethylene can be used alone or in combination of two or more.
- Examples of the ⁇ -olefin constituting the ethylene- ⁇ -olefin copolymer include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. Is mentioned.
- the polypropylene resin is not particularly limited, and examples thereof include polypropylene and a propylene- ⁇ -olefin copolymer containing 50% by weight or more of propylene. These may be used alone or in combination of two or more. You may use together.
- Examples of the ⁇ -olefin constituting the propylene- ⁇ -olefin copolymer include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. Can be mentioned.
- the polyethylene resin it is preferable to use a polyethylene resin having a narrow molecular weight distribution obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst.
- the polyethylene resin obtained by the above method can adjust the copolymerization ratio of the copolymerization component to be almost equal even if it is a polyethylene resin having any molecular weight.
- a polyolefin foam can be obtained.
- the substantially uniformly crosslinked polyolefin-based foam can be easily stretched, and the thickness thereof can be easily uniformed as a whole.
- the polyolefin-based foam substrate may have a crosslinked structure.
- a polyolefin-based foam by foaming a polyolefin-based resin sheet with a pyrolytic foaming agent or the like, it is preferable to design to form the crosslinked structure.
- the degree of cross-linking is preferably in the range of 5% by mass to 60% by mass, and in the range of 10% by mass to 55% by mass is good adhesion to the adhesive layer, touch feedback characteristics, and impact resistance. It is more preferable for further improving the properties.
- the degree of crosslinking can be measured by the following method. A set of five 40 mm ⁇ 50 mm square foam base materials is used as a sample, and the total mass (G1) is measured. Next, after immersing the sample in xylene at 120 ° C. for 24 hours, the xylene-insoluble matter was separated by filtration through a 300 mesh wire net, and the residue mass (G2) after drying at 110 ° C. for 1 hour was measured. To do. The xylene-insoluble content determined according to the following formula is defined as the degree of crosslinking.
- the method for producing the polyolefin foam is not particularly limited.
- a polyolefin resin containing 40% by weight or more of a polyethylene resin obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst and A polyolefin-based resin composition containing a pyrolytic foaming agent, a foaming aid, and a colorant for coloring the foam in black or white is supplied to an extruder and melt-kneaded.
- a method comprising a step of stretching a foam sheet by stretching in either or both of the width directions And the like.
- stretching a foam sheet should just be performed as needed, and may be performed in multiple times.
- the pyrolytic foaming agent is not particularly limited as long as it is conventionally used in the production of foams.
- azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, p-toluenesulfonyl Semicarbazide and the like can be mentioned, and among them, azodicarbonamide is preferable.
- a thermal decomposition type foaming agent may be individual, or 2 or more types may be used together.
- the amount of the pyrolytic foaming agent added may be appropriately determined according to the foaming ratio of the polyolefin foam, but is preferably 1 part by weight to 40 parts by weight with respect to 100 parts by weight of the polyolefin resin.
- the amount of 1 to 30 parts by mass is preferable because it is easy to adjust to a desired foaming ratio and the amount of displacement of the adhesive tape is easily adjusted to a predetermined range.
- a colored foam base material may be used in order to obtain an adhesive tape having design properties, light shielding properties, concealing properties, light reflectivity, light resistance, and the like.
- a conventionally known coloring agent can be used individually or in combination of 2 or more types.
- the light-shielding property, the concealing property and the light resistance are imparted to the adhesive tape, it is preferable to use a material colored black as the foam base material.
- the black colorant examples include carbon black, graphite, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, cyanine black, activated carbon, ferrite, magnetite, chromium oxide, iron oxide, molybdenum disulfide, and chromium complex.
- Complex oxide black dyes, anthraquinone organic black dyes, and the like can be used.
- carbon black it is preferable to use carbon black from the viewpoint of cost, availability, insulation, and heat resistance at a level that can withstand the temperature of the process of extruding the polyolefin resin composition and the heating and foaming process. .
- the design and light reflectivity are imparted to the adhesive tape, it is preferable to use a white colored one as the foam base material.
- the white colorant examples include titanium oxide, zinc oxide, aluminum oxide, silicon oxide, magnesium oxide, zirconium oxide, calcium oxide, tin oxide, barium oxide, cesium oxide, yttrium oxide, magnesium carbonate, calcium carbonate, barium carbonate, Zinc carbonate, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc hydroxide, aluminum silicate, calcium silicate, barium sulfate, calcium sulfate, barium stearate, zinc white, talc, silica, alumina, clay, kaolin, Inorganic white colorants such as titanium phosphate, mica, gypsum, white carbon, diatomaceous earth, bentonite, lithopone, zeolite, sericite, silicone resin particles, acrylic resin particles, urethane resin particles, melamine resin particles And the like can be used organic white colorants such as.
- titanium oxide, aluminum oxide, and zinc oxide are used as the colorant from the viewpoint of cost, availability, color tone, heat resistance that can withstand the temperature of the process of extruding the foamable polyolefin resin composition and the heating foaming process. It is preferable to do.
- the foam base material may be a plasticizer, an antioxidant, a foaming aid such as zinc oxide, a cell core modifier, a heat stabilizer, a flame retardant such as aluminum hydroxide or magnesium hydroxide, and an antistatic agent. It may contain known agents such as agents, fillers such as glass or plastic hollow balloons / beads, metal powders, metal compounds, conductive fillers, and heat conductive fillers.
- the colorant, the thermally decomposable foaming agent, the foaming auxiliary agent, etc. in order to prevent poor appearance such as uneven color shading, and poor foaming such as excessive foaming and non-foaming, a polyolefin resin, or It is preferable that the masterbatch is made of another thermoplastic resin that is easily compatible with the polyolefin resin.
- Examples of the method of crosslinking the polyolefin foam substrate include, for example, a method of irradiating the polyolefin foam substrate with ionizing radiation, an organic peroxide blended in advance in the foamable polyolefin resin composition, The method of heating the obtained polyolefin-type foam base material and decomposing
- ionizing radiation examples include electron beams, ⁇ rays, ⁇ rays, and ⁇ rays.
- the dose of ionizing radiation can be appropriately adjusted so that the cross-linking degree of the polyolefin-based foam substrate is within the above preferred range, but is preferably in the range of 5 kGy to 200 kGy.
- organic peroxide examples include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 2,2-bis ( t-butylperoxy) octane, n-butyl-4,4-bis (t-butylperoxy) valerate, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, ⁇ , ⁇ ′ -Bis (t-butylperoxy-m-isopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butyl) Peroxy) hexyne-3, benzoyl peroxide, cumyl peroxyneodecanate, t-butyl peroxybenzoate, 2,5
- the organic peroxide is preferably in the range of 0.01 parts by mass to 5 parts by mass, and in the range of 0.1 parts by mass to 3 parts by mass with respect to 100 parts by mass of the polyolefin resin. Since the residue of the decomposition
- the method of foaming the polyolefin resin sheet is not particularly limited, and examples thereof include a method of heating with hot air, a method of heating with infrared rays, a method using a salt bath, a method using an oil bath, and the like. May be. Among them, the method of heating with hot air or the method of heating with infrared rays is preferable because the difference in appearance between the front and back surfaces of the polyolefin-based foam substrate is reduced.
- the foam base material may be stretched.
- the stretching may be performed after foaming the polyolefin resin sheet to obtain a foam substrate, or may be performed when foaming the polyolefin resin sheet.
- the foam base material After foaming a polyolefin resin sheet to obtain a foam base material, when the foam base material is stretched, the foam base material is continuously maintained while maintaining the molten state at the time of foaming without cooling the foam base material. Even after stretching, the foam base material may be stretched after cooling the foam base material and heating the foam sheet again to a molten or softened state.
- the molten state of the foam base material means a state in which the foam base material is heated to a melting point or higher of the polyolefin resin constituting the foam base material.
- the softening of the foam base material refers to a state where the foam base material is heated to a temperature not lower than the melting point and lower than the melting point of the polyolefin resin constituting the foam base material.
- the stretching direction of the foam substrate is preferably in the flow direction or the width direction of the long polyolefin resin sheet, or in the flow direction and the width direction.
- the foam base material may be stretched simultaneously in the flow direction and the width direction, or may be stretched separately one by one. .
- a method of stretching the foam base material in the flow direction for example, a long polyolefin resin sheet after foaming is used rather than a speed (supply speed) at which the long polyolefin resin sheet is supplied to the foaming process.
- a method of stretching the foam base material in the flow direction by increasing the winding speed (winding speed) while cooling, foaming rather than the speed (supply speed) of supplying the obtained foam base material to the stretching process Examples include a method of stretching the foam base material in the flow direction by increasing the speed of winding the body base material (winding speed).
- the polyolefin resin sheet easily expands in the flow direction due to its own foaming, when the foam base material obtained using the polyolefin resin sheet is stretched in the flow direction, the polyolefin resin sheet Considering the amount of expansion in the flow direction due to foaming, it is preferable to adjust the supply speed and winding speed of the foam substrate so that the polyolefin resin sheet is stretched in the flow direction more than the expansion amount. .
- both ends in the width direction of the foam base material are gripped by a pair of gripping members, and the pair of gripping members are gradually moved in directions away from each other.
- a method of stretching the foam base material in the width direction is preferred. Since the polyolefin resin sheet expands in the width direction by its own foaming, when the foam base material is stretched in the width direction, the expansion in the width direction due to the foaming of the polyolefin resin sheet is taken into account. Above, it is preferable to adjust so that a foam base material may be extended
- the draw ratio in the flow direction of the foam substrate is preferably 1.1 to 5 times, more preferably 1.3 to 3.5 times.
- the draw ratio in the width direction is preferably 1.2 to 4.5 times, and more preferably 1.5 to 3.5 times.
- foam base material surface treatment such as corona treatment, flame treatment, plasma treatment, hot air treatment, ozone treatment, ultraviolet treatment, and easy adhesion treatment is performed in order to improve the adhesion with the pressure-sensitive adhesive layer and other layers.
- surface treatment such as corona treatment, flame treatment, plasma treatment, hot air treatment, ozone treatment, ultraviolet treatment, and easy adhesion treatment is performed in order to improve the adhesion with the pressure-sensitive adhesive layer and other layers.
- the applied one can be used.
- the surface of the surface-treated foam base material preferably has a wetting index by a wetting reagent of 36 mN / m or more, preferably 40 mN / m or more, and 48 mN / m or more. It is further preferable for maintaining good adhesion with a layer or the like.
- the foam base material with improved adhesion may be bonded to the adhesive layer in a continuous process. Further, the foam base material with improved adhesion may be temporarily wound up and stored, and then bonded to the adhesive layer at a later date.
- the foam base material having improved adhesion when winding up the foam base material having improved adhesion, it is preferable to wind it through a film made of paper, polyethylene, polypropylene, polyester, or the like in order to prevent blocking of the foam base material.
- the film is preferably a polypropylene film or a polyester film having a thickness of 25 ⁇ m or less.
- the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention can be formed using a pressure-sensitive adhesive.
- the pressure-sensitive adhesive examples include (meth) acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, natural rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives.
- a (meth) acrylic pressure-sensitive adhesive containing an acrylic polymer obtained by polymerizing the body and additives such as a tackifier resin and a crosslinking agent as required can be preferably used.
- Examples of the (meth) acrylate constituting the (meth) acrylic polymer include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl ( (Meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, decyl (meth)
- One or more (meth) acrylates having an alkyl group having 1 to 12 carbon atoms, such as acrylate and lauryl (meth) acrylate, are used.
- (meth) acrylate having an alkyl group having 4 to 12 carbon atoms it is preferable to use (meth) acrylate having an alkyl group having 4 to 12 carbon atoms, and (meth) acrylate having a linear or branched alkyl group having 4 to 8 carbon atoms is used. More preferably.
- n-butyl acrylate is preferable for obtaining a pressure-sensitive adhesive that is easy to ensure adhesion to an adherend and has excellent cohesive strength and resistance to sebum.
- the (meth) acrylate is preferably used in the range of 80% by mass to 98.5% by mass with respect to the total amount of monomers used for the production of the acrylic polymer, and 90% by mass to 98.%. It is more preferable to use in the range of 5% by mass.
- a polar vinyl monomer can be used as the monomer.
- the polar vinyl monomer one or more vinyl monomers having a hydroxyl group, vinyl monomers having a carboxyl group, vinyl monomers having an amide group, and the like can be used.
- vinyl monomer having a hydroxyl group examples include hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate.
- (Meth) acrylates having the following can be used.
- acrylic acid methacrylic acid, itaconic acid, maleic acid, (meth) acrylic acid dimer, crotonic acid, ethylene oxide-modified succinic acid acrylate, etc.
- acrylic acid Is preferably used.
- Examples of the vinyl monomer having an amide group include N-vinylpyrrolidone, N-vinylcaprolactam, (meth) acryloylmorpholine, acrylamide, N, N-dimethyl (meth) acrylamide, and the like.
- polar vinyl monomers include sulfonic acid group-containing monomers such as vinyl acetate and 2-acrylamido-2-methylpropane sulfonic acid.
- the polar vinyl monomer is preferably used in the range of 1.5% by mass to 20% by mass with respect to the total amount of monomers used for the production of the acrylic polymer, and 1.5% by mass to 10% by mass. % Is more preferable, and the content is more preferably 2% by mass to 8% by mass. By containing in the said range, it is easy to adjust the cohesive force, holding force, and adhesiveness of an adhesive to a suitable range.
- the vinyl monomer having a hydroxyl group is preferable as the vinyl monomer having a functional group that reacts therewith, such as 2-hydroxyethyl (meth) acrylate, 4-hydroxy Butyl (meth) acrylate and 6-hydroxyhexyl (meth) acrylate are particularly preferred.
- the vinyl monomer having a hydroxyl group that reacts with the isocyanate-based crosslinking agent should be used in the range of 0.01% by mass to 1.0% by mass with respect to the total amount of monomers used for the production of the acrylic polymer. It is preferable to use in the range of 0.03% by mass to 0.3% by mass.
- the acrylic polymer can be produced by polymerizing the monomer by a known polymerization method such as a solution polymerization method, a cage polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- a solution polymerization method such as a solution polymerization method, a cage polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- it is preferably produced by a solution polymerization method or a bulk polymerization method.
- the polymerization initiation method includes a method using a polymerization initiator.
- the polymerization initiator include peroxide-based polymerization initiators such as benzoyl peroxide and lauroyl peroxide, azo-based thermal polymerization initiators such as azobisisobutylnitrile, acetophenone-based photopolymerization initiators, and benzoin ether-based light.
- a polymerization initiator, a benzyl ketal photopolymerization initiator, an acylphosphine oxide photopolymerization initiator, a benzoin photopolymerization initiator, or a benzophenone photopolymerization initiator can be used.
- the molecular weight of the acrylic polymer is 400,000 to 3 million, preferably 800,000 to 2.5 million, based on standard polystyrene as measured by gel permeation chromatography (GPC).
- the molecular weight measurement by the GPC method is a standard polystyrene conversion value measured using a GPC apparatus (HLC-8329GPC) manufactured by Tosoh Corporation, and the measurement conditions are as follows.
- the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer it is preferable to use a tackifying resin for the purpose of further improving the adhesion to the adherend and the surface adhesion strength.
- the tackifying resin examples include a rosin-based tackifying resin, a polymerized rosin-based tackifying resin, a polymerized rosin ester-based tackifying resin, a rosin phenol-based tackifying resin, a stabilized rosin ester-based tackifying resin, and a disproportionated rosin ester-based resin.
- a tackifier resin, a hydrogenated rosin ester tackifier resin, a terpene tackifier resin, a terpene phenol tackifier resin, a petroleum resin tackifier resin, a (meth) acrylate tackifier resin, or the like can be used.
- an emulsion type adhesive is used as the adhesive
- an emulsion type tackifying resin is preferably used.
- tackifying resin examples include disproportionated rosin ester tackifying resin, polymerized rosin ester tackifying resin, rosin phenol tackifying resin, hydrogenated rosin ester tackifying resin, (meth) acrylate, among others. It is preferable to use one type or two or more types of tackifier resins and terpene phenol tackifier resins.
- the softening point of the tackifying resin is not particularly specified, but is 30 ° C to 180 ° C, preferably 70 ° C to 140 ° C.
- the glass transition temperature is 30 ° C. to 200 ° C., preferably 50 ° C. to 160 ° C.
- the amount of the tackifying resin used relative to 100 parts by mass of the acrylic polymer is preferably 5 parts by mass to 65 parts by mass, and more preferably 8 parts by mass to 55 parts by mass.
- the adhesive is preferably used in combination with a crosslinking agent for the purpose of further improving the cohesive force of the adhesive layer.
- the crosslinking agent examples include an isocyanate crosslinking agent, an epoxy crosslinking agent, a metal chelate crosslinking agent, and an aziridine crosslinking agent.
- a crosslinking agent of a type that can be added after the completion of the polymerization of the acrylic polymer and promotes a crosslinking reaction.
- Examples of the isocyanate-based crosslinking agent include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane-modified tolylene diisocyanate, and the like. Particularly preferred are trifunctional polyisocyanate compounds. Examples of the trifunctional isocyanate compound include tolylene diisocyanate, trimethylolpropane adducts thereof, and triphenylmethane isocyanate.
- a gel fraction value for measuring the insoluble content after the pressure-sensitive adhesive layer is immersed in toluene for 24 hours is used.
- the gel fraction is preferably 25% by mass to 70% by mass. More preferably in the range of 30% by mass to 60% by mass, and still more preferably in the range of 30% by mass to 55% by mass, both cohesion and adhesiveness are good.
- the gel fraction is measured by the following method.
- a pressure-sensitive adhesive containing a crosslinking agent was applied on the release sheet as needed so that the thickness after drying was 50 ⁇ m, dried at 100 ° C. for 3 minutes, and aged at 40 ° C. for 2 days. A thing is cut into a 50-mm square and this is made into a sample.
- the sample is immersed in a toluene solution at 23 ° C. for 24 hours.
- the toluene-insoluble matter of the sample after the immersion is separated by filtering through a 300 mesh wire mesh, and the mass (G2) of the residue after drying at 110 ° C. for 1 hour is measured, and the gel fraction is obtained according to the following formula. It is done.
- a plasticizer e.g., ethylene glycol dimethacrylate copolymer (ethylene glycol dimethacrylate), ethylene glycol dimethacrylate (PE), ethylene glycol dimethacrylate (PE), ethylene glycol dimethacrylate (PE), ethylene glycol dimethacrylate (PE), ethylene glycol dimethacrylate (PE), ethylene glycol dimethacrylate (PE), ethylene glycol dimethacrylate, ethylene glycol dime, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate (ethylene glycol dimethacrylate), ethylene glycol dimethacrylate (ethylene glycol dimethacrylate), ethylene glycol dimethacrylate (ethylene glycol dimethacrylate), ethylene glycol dimethacrylate (ethylene glycol dimethacrylate), ethylene glycol dimethacrylate (ethylene glycol dimethacryl
- the temperature of the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention is preferably -40 ° C. to 15 ° C., preferably at a temperature showing a peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz.
- a pressure-sensitive adhesive layer formed to a thickness of about 2 mm was used using a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan).
- a test piece is sandwiched between parallel disks having a diameter of 8 mm, which is a measuring part, and a storage elastic modulus (G ′) and a loss elastic modulus (G ′′) from ⁇ 50 ° C. to 150 ° C. are measured at a frequency of 1 Hz.
- the thickness of the pressure-sensitive adhesive layer is preferably in the range of 10 ⁇ m to 100 ⁇ m, more preferably in the range of 10 ⁇ m to 100 ⁇ m, in order to further improve the adhesion to the adherend and to ensure even better touch feedback characteristics.
- a range of 80 ⁇ m is more preferable.
- the pressure-sensitive adhesive tape of the present invention is, for example, a direct copy method in which a pressure-sensitive adhesive is applied and dried directly on a foam substrate or on the surface of another layer laminated on the foam substrate, and a pressure-sensitive adhesive on a release sheet.
- a transfer method in which is applied and dried and then bonded to the surface of the foam base material or other layer.
- the aging step is preferably 2 to 7 days in an environment of 20 ° C. to 50 ° C., more preferably 23 ° C. to 45 ° C. If it performs, the adhesiveness and adhesive physical property of a foam base material and an adhesive layer can be stabilized.
- the release sheet is not particularly limited, but is adhered to at least one surface of a base material such as a synthetic resin film such as polyethylene, polypropylene, or polyester film, paper, nonwoven fabric, cloth, foam sheet or metal foil, and a laminate thereof.
- a base material such as a synthetic resin film such as polyethylene, polypropylene, or polyester film, paper, nonwoven fabric, cloth, foam sheet or metal foil, and a laminate thereof.
- a material that has been subjected to a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment for improving the releasability from the agent can be used.
- release sheet high-quality paper laminated on both sides with polyethylene having a thickness of 10 to 40 ⁇ m, or one having both sides of a polyester film base material subjected to silicone-based release treatment may be used. preferable.
- the pressure-sensitive adhesive tape of the present invention obtained by the above method or the like is a touch panel device provided with a vibration generating device that provides tactile feedback by having the pressure-sensitive adhesive layer on at least one surface, preferably both surfaces of the foam substrate. Even if it is a case where it uses for fixation with a body, a touch feedback characteristic can be provided suitably. Therefore, the adhesive tape of the present invention is a smartphone or tablet type that improves operability and has a large screen among electronic devices including a liquid crystal display (LCD), an organic EL display (OELD), a plasma display panel (PDP), and the like. It can be suitably used in the production scene of electronic devices such as personal computers, notebook computers, electronic notebooks, mobile phones, PHS, digital cameras, music players, televisions, game machines, and electronic paper.
- LCD liquid crystal display
- OELD organic EL display
- PDP plasma display panel
- the foam base material constituting the adhesive tape absorbs the impact even when an impact is applied by dropping or the like. Therefore, it has good impact resistance. Therefore, the adhesive tape can be suitably used for fixing a touch panel device having a diagonal size of 3.5 inches or more, particularly for fixing a touch panel device having a heavy mass per unit bonding area.
- the adhesive tape of the present invention has suitable adhesion and followability with the adherend, it is possible to effectively prevent infiltration of water and dust from the adhesion gap, and excellent waterproof and drip-proof, Has dust-proof function.
- An embodiment of the pressure-sensitive adhesive tape of the present invention has a basic structure in which a foam base material is a core, and a pressure-sensitive adhesive layer is provided on at least one surface, preferably both surfaces of the foam base material.
- the foam substrate and the pressure-sensitive adhesive layer may be directly laminated or may be laminated via another layer.
- the adhesive tape may have other layers as required in addition to the foam base material and the adhesive layer.
- laminate layers such as a polyester film.
- a metal You may have the layer which consists of a nonwoven fabric plated with foil or a metal mesh electroconductive metal.
- a film such as a polyester film such as polyethylene terephthalate, a polyethylene film, or a polypropylene film can be used.
- the thickness of the laminate layer is not particularly defined, but is preferably in the range of 1 ⁇ m to 25 ⁇ m, and more preferably in the range of 2 ⁇ m to 12 ⁇ m, in order to ensure good followability to the foam substrate. .
- a conventionally known pressure-sensitive adhesive or an adhesive for dry lamination can be used.
- the light shielding layer examples include a layer printed with an ink containing a colorant such as a pigment, and a layer printed with black ink can be preferably used.
- the reflective layer examples include a layer printed with an ink containing a colorant such as a pigment, and a layer printed with white ink can be preferably used.
- the thickness of the light-shielding layer and the reflective layer is preferably 2 ⁇ m to 20 ⁇ m, and preferably 4 ⁇ m to 6 ⁇ m because curling of the adhesive tape due to the curing shrinkage of the ink can be suppressed.
- Example 1 Preparation of double-sided adhesive tape 100 parts by mass of the pressure-sensitive adhesive composition (A) and 1.1 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content: 45% by mass) were mixed for 15 minutes.
- the agitated material is coated on the release-treated surface of a 75 ⁇ m-thick polyethylene terephthalate film (PET film) that has been subjected to a release treatment so that the thickness after drying is 50 ⁇ m, and is dried at 80 ° C. for 3 minutes. A layer was formed.
- the pressure-sensitive adhesive layer was aged at 40 ° C. for 48 hours, the pressure-sensitive adhesive layer had a gel fraction of 48 mass% and a temperature showing a peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz was ⁇ 17 ° C. It was.
- black polyolefin-based foam (1) (thickness 500 ⁇ m, apparent density 0.10 g / cm 3 , 25% compressive strength: 39 kPa, flow direction tensile strength: 219 N / cm 2 , width direction tensile strength
- the surface of the foam made by Sekisui Chemical Co., Ltd., which is 178 N / cm 2, with a wetting index of 60 mN / m by corona treatment), one adhesive layer before aging on each side of the substrate After bonding, the laminate was laminated with a roll having an underline pressure of 5 kg / cm at 23 ° C. Thereafter, aging was performed at 40 ° C. for 48 hours to obtain a double-sided pressure-sensitive adhesive tape having a thickness of 600 ⁇ m.
- the thickness of the foam was measured using a dial series gauge G type manufactured by Ozaki Seisakusho.
- the thickness of the double-sided pressure-sensitive adhesive tape was measured using a dial series gauge G type manufactured by Ozaki Seisakusho with the release film removed.
- the tensile strength of the foam was determined by cutting a test piece obtained by cutting the foam into a size of 2 cm between the marked lines (flow direction and width direction of the foam base material) and 1 cm in width. The strength at the time of cutting by cutting at / min was measured.
- the thickness and tensile strength of the foam used in Example 2 and later, and the thickness of the double-sided adhesive tape were also measured by the same method as described above.
- Example 2 The pressure-sensitive adhesive composition (B) was used in place of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used.
- a double-sided pressure-sensitive adhesive tape having a thickness of 600 ⁇ m was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.33 parts by mass.
- the gel fraction of the pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours was 37% by mass, and the temperature showing the peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz was 2 ° C.
- Example 3 The pressure-sensitive adhesive composition (C) was used in place of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used.
- a double-sided adhesive tape having a thickness of 600 ⁇ m was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.0 part by mass.
- the pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours had a gel fraction of 42% by mass and a temperature showing a peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz was ⁇ 28 ° C.
- Example 4 The pressure-sensitive adhesive composition (D) was used instead of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used.
- a double-sided adhesive tape having a thickness of 600 ⁇ m was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.6 parts by mass.
- the pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours had a gel fraction of 40% by mass and a temperature showing a peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz was ⁇ 5 ° C.
- Black polyolefin foam (2) instead of black polyolefin foam (1) (thickness: 500 ⁇ m, apparent density 0.07 g / cm 3 , 25% compressive strength: 32 kPa, tensile strength in the flow direction: 160 N / cm 2, a tensile strength in the width direction: 132N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment
- a double-sided pressure-sensitive adhesive tape having a thickness of 600 ⁇ m was obtained in the same manner as in No. 4.
- Example 6 instead of the black polyolefin foam (1), the white polyolefin foam (1) (thickness: 600 ⁇ m, apparent density 0.10 g / cm 3 , 25% compression strength: 52 kPa, tensile strength in the flow direction: 215 N / cm 2, a tensile strength in the width direction: 115N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 700 ⁇ m was obtained in the same manner as in Example 1.
- Example 7 Black polyolefin foam (3) instead of black polyolefin foam (1) (thickness: 800 ⁇ m, apparent density 0.13 g / cm 3 , 25% compression strength: 74 kPa, tensile strength in the flow direction: 262 N / cm 2, a tensile strength in the width direction: 167N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 900 ⁇ m was obtained in the same manner as in Example 1.
- Example 8 Black ethylene-vinyl acetate copolymer foam (1) instead of black polyolefin foam (1) (thickness: 1100 ⁇ m, apparent density 0.13 g / cm 3 , 25% compressive strength: 59 kPa, tensile in the flow direction strength: 202N / cm 2, tensile strength in the width direction: 145N / cm 2, a is manufactured by Toray Industries, Inc.
- a double-sided pressure-sensitive adhesive tape having a thickness of 1250 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer was changed from 50 ⁇ m to 75 ⁇ m.
- Example 9 Black ethylene-vinyl acetate copolymer foam (2) instead of black polyolefin foam (1) (thickness: 800 ⁇ m, apparent density 0.13 g / cm 3 , 25% compressive strength: 52 kPa, tensile in the flow direction strength: 223N / cm 2, tensile strength in the width direction: 164N / cm 2, a is Toray surface of Co. foam which was wetting index 54 mN / m corona treatment) except for using the A double-sided pressure-sensitive adhesive tape having a thickness of 950 ⁇ m was obtained in the same manner as in Example 8.
- Example 10 Black polyolefin foam (4) instead of black polyolefin foam (1) (thickness: 400 ⁇ m, apparent density 0.12 g / cm 3 , 25% compression strength: 43 kPa, tensile strength in the flow direction: 223 N / cm 2, a tensile strength in the width direction: 164N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 500 ⁇ m was obtained in the same manner as in Example 1.
- Comparative Example 3 A double-sided pressure-sensitive adhesive tape having a thickness of 750 ⁇ m was obtained in the same manner as in Comparative Example 2, except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 50 ⁇ m to 75 ⁇ m.
- Foam substrate and adhesive tape thickness The thickness of the foam base material was measured using a dial series gauge G type manufactured by Ozaki Seisakusho. The thickness of the pressure-sensitive adhesive tape was measured by using a dial thickness gauge G type after peeling the release film.
- the foam base material was cut to about 1 cm in both the flow direction and the width direction, and the center part of the cut surface of the foam base material was enlarged 200 times with a microscope (trade name “KH-7700”, manufactured by HIROX). Then, the cross section of the width direction of a foam base material or the flow direction was photographed so that the cut surface of a foam base material might fit in a photograph over the full length of the base material thickness direction. In the obtained photograph, all the bubble diameters existing on the cut surface having an actual length of 2 mm before expansion in the flow direction or the width direction were measured, and the average bubble diameter was calculated from the average value. This was measured at 10 arbitrary points, and the average value was taken as the average cell diameter in the flow direction (MD) and the width direction (CD).
- a U-shaped measuring table (made of aluminum with a thickness of 5 mm) having a length of 150 mm, a width of 100 mm and a height of 45 mm is installed on the base of the DuPont impact tester (manufactured by Tester Sangyo Co., Ltd.). The test piece was placed on top with the acrylic plate facing down (FIG. 3). A stainless steel striker with a diameter of 15 mm, a mass of 300 g, and a striking end with a curvature of 3/16 inch is dropped from the height of 10 cm from the ABS plate side to the center part of the ABS plate side at intervals of 10 seconds 5 times. The test piece was evaluated for tape peeling and breakage. When the tape was not peeled off or broken, the falling height was increased at 10 cm intervals, and continuous dropping was repeated 5 times, and the height when peeling or breaking of the tape was observed was measured.
- the adhesive tape of the present invention can realize a suitable tactile feedback function when used for fixing a touch panel device having a tactile feedback function. Moreover, it had excellent drop impact resistance and followability. On the other hand, the adhesive tapes of Comparative Examples 1 to 3 did not have vibration characteristics or sufficient resistance.
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Abstract
The present invention addresses the problem of providing an adhesive tape having so-called touch feedback properties that allow displacement (allow compression) in response to a touch panel section being pressed and do not interfere with transmission of vibrations to the touch panel section and fingertips, etc. The present invention is adhesive tape characterized: in being used for fixing touch panel devices, which have a touch feedback function of sensing the contact of an object and giving tactile feedback; and in the amount of displacement when compressed in the thickness direction with a compression load of 5 N/cm2 being at least 130 µm.
Description
本発明は、タッチフィードバック機能を有するタッチパネル装置の固定に用いられる粘着テープに関する。
The present invention relates to an adhesive tape used for fixing a touch panel device having a touch feedback function.
近年、電子手帳、携帯電話、PHS、スマートフォン、デジタルカメラ、音楽プレーヤー、テレビ、ノート型パソコン、タブレット型パソコン、ゲーム機、カーナビゲーションシステム等の小型電子機器としては、タッチパネル機能を備えたものが広く普及している。
In recent years, small electronic devices such as electronic notebooks, mobile phones, PHS, smart phones, digital cameras, music players, TVs, notebook computers, tablet computers, game consoles, car navigation systems, etc. have been widely equipped with touch panel functions. It is popular.
しかし、上記電子機器を使用したことがない初心者や高齢者は、タッチパネルの操作に不慣れな場合が多く、上記電子機器の操作を誤る場合があった。
However, beginners and elderly people who have never used the electronic device are often unfamiliar with the operation of the touch panel, and sometimes operate the electronic device incorrectly.
上記操作の誤りを防止する機能としては、タッチパネルに対してした入力操作が、電子機器に受け入れられたか否かを簡単かつ明確に確認することができる、いわゆるタッチフィードバック機能が知られている。
As a function for preventing an error in the above operation, a so-called touch feedback function is known in which it is possible to easily and clearly confirm whether or not an input operation performed on the touch panel is accepted by an electronic device.
前記タッチフィードバック機能としては、例えばタッチパネルへの操作を電子機器が受け入れた際に、前記電子機器またはタッチパネル部が振動し、その振動によって操作者に入力操作が受け入れられたことを認識させる機能(触覚フィードバック機能)が検討されている(例えば、特許文献1~2参照)。
As the touch feedback function, for example, when an electronic device accepts an operation on the touch panel, the electronic device or the touch panel unit vibrates, and the vibration causes the operator to recognize that the input operation has been accepted (tactile sense). (Feedback function) has been studied (see, for example, Patent Documents 1 and 2).
前記触覚フィードバック機能としては、具体的にはタッチパネルまたはタッチパネル機能つきのディスプレイモジュールなどに圧電素子(ピエゾ素子ともいう)や振動モーター、リニア振動アクチュエーターなどの振動発生源を取り付けて、タッチパネル装置全体または一部を振動させる方法が知られている(例えば特許文献3参照。)。この機能は、タッチパネル等を操作すべくその表面に接触した指先等に、直接振動を伝えることができ、また、従来のボタンを押したときの様なクリック感に近い感触を、操作者に与えることができるという利点がある。
Specifically, as the tactile feedback function, a vibration generation source such as a piezoelectric element (also referred to as a piezo element), a vibration motor, or a linear vibration actuator is attached to a touch panel or a display module with a touch panel function, and the entire touch panel device or a part thereof. Is known (see, for example, Patent Document 3). This function can directly transmit vibration to the fingertip that touches the surface of the touch panel to operate the touch panel, etc., and gives the operator a feel similar to that of clicking when a conventional button is pressed. There is an advantage that you can.
一方、上記振動やクリック感に近い感触は、操作者が単にタッチパネル部に触れた際に与えるのではなく、操作者が微小な圧力でタッチパネル部を押し込んだ(入力した)際に与えることが、操作者の誤認や誤操作等を防止するうえで好ましい。
On the other hand, a feeling close to the above vibration or click feeling is not given when the operator simply touches the touch panel part, but when the operator pushes in (inputs) the touch panel part with a minute pressure, This is preferable for preventing misidentification or misoperation of the operator.
しかし、タッチパネル部ときょう体との固定に、通常、使用される粘着テープは、上記タッチパネル部の表面がごくわずかに押し込まれた際に、そのタッチパネル部の押込み変位に対応して、ごくわずかに変位する(圧縮される)特性を備えていないため、前記押込みに対応した振動等を、操作者に与えることができない場合があった。
However, the adhesive tape usually used for fixing to the touch panel unit and the case is very slightly corresponding to the indentation displacement of the touch panel part when the surface of the touch panel part is pushed in very slightly. Since it does not have the characteristic of being displaced (compressed), there is a case where vibrations corresponding to the pressing cannot be given to the operator.
また、前記押込みを感知し発生した振動等は、前記粘着テープを介して、タッチパネル部はもとより指先等に伝えられるところ、従来の粘着テープでは、前記振動の伝達を阻害したり、前記振動をタッチパネル部とは逆側(きょう体側)に伝えたりしてしまう場合がある等の問題があった。
In addition, vibrations generated by detecting the pressing are transmitted to the fingertips as well as the touch panel portion through the adhesive tape. However, in the conventional adhesive tape, the transmission of the vibration is inhibited or the vibration is applied to the touch panel. There is a problem that it may be transmitted to the opposite side (case side) of the part.
本発明が解決しようとする課題は、タッチパネル部の押込みに対応して、変位可能(圧縮可能)で、かつ、タッチパネル部及び指先等への振動の伝達を阻害しない、いわゆるタッチフィードバック特性を備えた粘着テープを提供することである。
The problem to be solved by the present invention is provided with a so-called touch feedback characteristic that is displaceable (compressible) and does not hinder the transmission of vibration to the touch panel part and the fingertip in response to the pressing of the touch panel part. It is to provide an adhesive tape.
また、本発明が解決しようとする第二の課題は、上記タッチフィードバック特性とともに、前記モバイル機器の製造に使用可能なレベルの耐衝撃性と、被着体の凹凸表面への追従性とに優れた粘着テープを提供することである。
In addition, the second problem to be solved by the present invention is excellent in the above-mentioned touch feedback characteristics, impact resistance at a level that can be used for manufacturing the mobile device, and followability to the uneven surface of the adherend. Is to provide an adhesive tape.
本発明者は、発泡体基材層と粘着剤層とを有する粘着テープであって、物体の接触を感知して、触覚フィードバックを与えるタッチフィードバック機能を有するタッチパネル装置の固定に用いられ、厚さ方向に圧縮荷重5N/cm2で圧縮した際の変位量が130μm以上であることを特徴とする粘着テープであれば、前記課題を解決できることを見出した。
The present inventor is an adhesive tape having a foam base material layer and an adhesive layer, and is used for fixing a touch panel device having a touch feedback function that senses contact of an object and gives tactile feedback. It has been found that the above-mentioned problems can be solved if the pressure-sensitive adhesive tape has a displacement amount of 130 μm or more when compressed in the direction with a compressive load of 5 N / cm 2 .
本発明の粘着テープは、タッチパネル部の押込みに対応して変位可能(圧縮可能)で、かつ、タッチパネル部及び指先等への振動の伝達を阻害しない、いわゆるタッチフィードバック特性を備えることから、もっぱらタッチフィードバック機能を備えたタッチパネル装置ときょう体との固定等に使用することができる。
The pressure-sensitive adhesive tape of the present invention has a so-called touch feedback characteristic that can be displaced (compressible) in response to the pressing of the touch panel portion and does not hinder the transmission of vibration to the touch panel portion and the fingertip. The touch panel device having a feedback function can be used for fixing to a casing.
また、本発明の粘着テープは、上記タッチフィードバック特性とともに、耐衝撃性や被着体表面の凹凸への追従性、耐剥がれ性にも優れることから、落下の生じやすい携帯電子機器、特に、大画面化が進み耐衝撃性の要請の高いスマートフォン、タブレット型パソコン、ノート型パソコンあるいはゲーム機等の携帯型の電子機器の製造に好適に使用することができる。
In addition, the adhesive tape of the present invention is excellent in impact resistance, follow-up to unevenness on the surface of the adherend, and peeling resistance in addition to the touch feedback characteristics described above. It can be suitably used for the manufacture of portable electronic devices such as smartphones, tablet computers, notebook computers, and game machines, which are increasingly screened and have a high demand for impact resistance.
本発明の粘着テープは、発泡体基材層と粘着剤層とを有し、厚さ方向に圧縮荷重5N/cm2で圧縮した際の変位量が130μm以上であることを特徴とするものである。前記粘着テープは、もっぱらタッチフィードバック機能を備えたタッチパネル装置の固定に使用することができる。
The pressure-sensitive adhesive tape of the present invention has a foam base material layer and a pressure-sensitive adhesive layer, and has a displacement amount of 130 μm or more when compressed with a compression load of 5 N / cm 2 in the thickness direction. is there. The adhesive tape can be used exclusively for fixing a touch panel device having a touch feedback function.
前記粘着テープとしては、厚さ方向に5N/cm2の荷重で圧縮した際の変位量が130μm以上であるものを使用する。
As the adhesive tape, one having a displacement of 130 μm or more when compressed with a load of 5 N / cm 2 in the thickness direction is used.
前記変位量は、より一層優れたタッチフィードバック特性を付与するうえで、140μm以上であることがより好ましく、150μm以上であることがさらに好ましい。前記変位量の上限は、特に制限はないが、400μm以下であることが好ましく、300μm以下であることが、前記粘着テープによって固定された部品等の、粘着テープの過度な変形に起因した浮きや剥がれを防止できるため好ましい。
The amount of displacement is more preferably 140 μm or more, and further preferably 150 μm or more, in order to impart even more excellent touch feedback characteristics. The upper limit of the displacement amount is not particularly limited, but is preferably 400 μm or less, and 300 μm or less is a float or the like caused by excessive deformation of the adhesive tape, such as a part fixed by the adhesive tape. It is preferable because peeling can be prevented.
なお、上記圧縮荷重5N/cm2で圧縮した際の変位量とは、以下の(1)及び(2)の方法で測定した値を指す。
(1)23℃で、厚さ9mmで10cm角の平滑なアルミニウム板に、2cm角の粘着テープを貼付して、23℃24時間放置して試験片とする。
(2)次に、直径7mmのステンレス製プローブを取り付けた引張試験機で、粘着テープの表面の中心を0.5mm/分の速度で、5N/cm2の力で圧縮した際の変位量を求める。前記変位量は、前記圧縮前の粘着テープの平滑な表面を基準面とし、その基準面と、その厚さ方向に押込まれた際の最深さとの距離をさす。 In addition, the amount of displacement when compressed with the compression load of 5 N / cm 2 indicates a value measured by the following methods (1) and (2).
(1) At 23 ° C., apply a 2 cm square pressure-sensitive adhesive tape to a smooth aluminum plate having a thickness of 9 mm and a 10 cm square, and leave it at 23 ° C. for 24 hours to obtain a test piece.
(2) Next, with a tensile tester equipped with a stainless steel probe having a diameter of 7 mm, the displacement amount when the center of the surface of the adhesive tape is compressed with a force of 5 N / cm 2 at a speed of 0.5 mm / min. Ask. The amount of displacement refers to the distance between the reference surface and the deepest depth when pressed in the thickness direction with the smooth surface of the pressure-sensitive adhesive tape before compression as the reference surface.
(1)23℃で、厚さ9mmで10cm角の平滑なアルミニウム板に、2cm角の粘着テープを貼付して、23℃24時間放置して試験片とする。
(2)次に、直径7mmのステンレス製プローブを取り付けた引張試験機で、粘着テープの表面の中心を0.5mm/分の速度で、5N/cm2の力で圧縮した際の変位量を求める。前記変位量は、前記圧縮前の粘着テープの平滑な表面を基準面とし、その基準面と、その厚さ方向に押込まれた際の最深さとの距離をさす。 In addition, the amount of displacement when compressed with the compression load of 5 N / cm 2 indicates a value measured by the following methods (1) and (2).
(1) At 23 ° C., apply a 2 cm square pressure-sensitive adhesive tape to a smooth aluminum plate having a thickness of 9 mm and a 10 cm square, and leave it at 23 ° C. for 24 hours to obtain a test piece.
(2) Next, with a tensile tester equipped with a stainless steel probe having a diameter of 7 mm, the displacement amount when the center of the surface of the adhesive tape is compressed with a force of 5 N / cm 2 at a speed of 0.5 mm / min. Ask. The amount of displacement refers to the distance between the reference surface and the deepest depth when pressed in the thickness direction with the smooth surface of the pressure-sensitive adhesive tape before compression as the reference surface.
前記粘着テープとしては、その単位厚さあたりの前記変位量[厚さ方向に圧縮荷重5N/cm2で圧縮した際の変位量/粘着テープの厚さ]が、0.13以上であるものを使用することが好ましく、0.15以上であるものを使用することがさらに好ましい。
As the adhesive tape, the amount of displacement per unit thickness [the amount of displacement when compressed with a compressive load of 5 N / cm 2 in the thickness direction / the thickness of the adhesive tape] is 0.13 or more. It is preferable to use, and it is more preferable to use what is 0.15 or more.
また、前記粘着テープとしては、周波数1Hzにおける損失正接(tanδ)のピーク値が、0.53以下であるものを使用することが好ましく、0.1~0.53であるものを使用することが、より一層優れたタッチフィードバック特性を付与するうえで好ましい。
The adhesive tape preferably has a loss tangent (tan δ) peak value of 0.53 or less at a frequency of 1 Hz, preferably 0.1 to 0.53. Therefore, it is preferable for imparting more excellent touch feedback characteristics.
なお、前記周波数1Hzにおける損失正接(tanδ)は、温度分散による動的粘弾性測定で得られた貯蔵弾性率(G’)、損失弾性率(G”)から、tanδ=G”/G’の式より求められる。動的粘弾性の測定においては、粘弾性試験機(ティ・エイ・インスツルメント・ジャパン社製、商品名:ARES G2)を用いて、直径8mmの円形に加工した粘着テープ1枚を同試験機の測定部である直径8mmの平行円盤の間に試験片を挟み込み、周波数1Hz、昇温速度2℃/分で-50℃から150℃までの損失正接(tanδ)を測定して極大値を求める。なお、極大値が2つ以上存在する場合は、値が大きい方を採用する。
The loss tangent (tan δ) at the frequency of 1 Hz is calculated from the storage elastic modulus (G ′) and loss elastic modulus (G ″) obtained by the dynamic viscoelasticity measurement by temperature dispersion, and tan δ = G ″ / G ′. It is obtained from the formula. In the measurement of dynamic viscoelasticity, using a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan Co., Ltd.), one piece of adhesive tape processed into a circle with a diameter of 8 mm was tested. A test piece is sandwiched between parallel disks with a diameter of 8 mm, which is the measuring part of the machine, and the loss tangent (tan δ) from -50 ° C. to 150 ° C. is measured at a frequency of 1 Hz and a heating rate of 2 ° C./min. Ask. If there are two or more maximum values, the one with the larger value is adopted.
本発明の粘着テープは、下記測定条件により測定される面接着強度が、90N/4cm2以上であることが好ましく、130N/4cm2以上であることがより好ましい。
In the pressure-sensitive adhesive tape of the present invention, the surface adhesive strength measured under the following measurement conditions is preferably 90 N / 4 cm 2 or more, and more preferably 130 N / 4 cm 2 or more.
上記面接着強度の測定条件は以下の(3)~(5)とおりである。
(3)23℃で、厚さ2mmで5cm角のアクリル板に、幅5mm及び長さ4cmの2枚の両面粘着テープを平行に貼付する。
(4)次に、中心部に直径1cmの穴を設けた厚さ2mm、幅10cm及び長さ15cmの長方形の平滑なABS板に、(3)で作成した両面粘着テープつきアクリル板を、アクリル板の中心とアクリロニトリル-ブタジエン-スチレン板(ABS板)の中心とが一致するように貼付して、2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とする。
(5)前記試験片を構成するABS板側から、ABS板の穴を通して、直径7mmのステンレス製プローブを取り付けた引張試験機でアクリル板を10mm/分で押し、前記ABS板と前記アクリル板とが剥がれる強度を測定する。 The measurement conditions of the surface adhesive strength are as follows (3) to (5).
(3) Two double-sided pressure-sensitive adhesive tapes having a width of 5 mm and a length of 4 cm are attached in parallel to an acrylic plate having a thickness of 2 mm and a square of 5 cm at 23 ° C.
(4) Next, the acrylic plate with the double-sided adhesive tape created in (3) is acrylic on a rectangular smooth ABS plate having a thickness of 2 mm, a width of 10 cm and a length of 15 cm with a 1 cm diameter hole in the center. Affixed so that the center of the plate and the center of the acrylonitrile-butadiene-styrene plate (ABS plate) coincide with each other, press once with a 2 kg roller, and let stand at 23 ° C. for 1 hour to obtain a test piece.
(5) From the ABS plate side constituting the test piece, through the hole in the ABS plate, push the acrylic plate at 10 mm / min with a tensile tester equipped with a stainless steel probe having a diameter of 7 mm, and the ABS plate and the acrylic plate Measure the strength to peel off.
(3)23℃で、厚さ2mmで5cm角のアクリル板に、幅5mm及び長さ4cmの2枚の両面粘着テープを平行に貼付する。
(4)次に、中心部に直径1cmの穴を設けた厚さ2mm、幅10cm及び長さ15cmの長方形の平滑なABS板に、(3)で作成した両面粘着テープつきアクリル板を、アクリル板の中心とアクリロニトリル-ブタジエン-スチレン板(ABS板)の中心とが一致するように貼付して、2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とする。
(5)前記試験片を構成するABS板側から、ABS板の穴を通して、直径7mmのステンレス製プローブを取り付けた引張試験機でアクリル板を10mm/分で押し、前記ABS板と前記アクリル板とが剥がれる強度を測定する。 The measurement conditions of the surface adhesive strength are as follows (3) to (5).
(3) Two double-sided pressure-sensitive adhesive tapes having a width of 5 mm and a length of 4 cm are attached in parallel to an acrylic plate having a thickness of 2 mm and a square of 5 cm at 23 ° C.
(4) Next, the acrylic plate with the double-sided adhesive tape created in (3) is acrylic on a rectangular smooth ABS plate having a thickness of 2 mm, a width of 10 cm and a length of 15 cm with a 1 cm diameter hole in the center. Affixed so that the center of the plate and the center of the acrylonitrile-butadiene-styrene plate (ABS plate) coincide with each other, press once with a 2 kg roller, and let stand at 23 ° C. for 1 hour to obtain a test piece.
(5) From the ABS plate side constituting the test piece, through the hole in the ABS plate, push the acrylic plate at 10 mm / min with a tensile tester equipped with a stainless steel probe having a diameter of 7 mm, and the ABS plate and the acrylic plate Measure the strength to peel off.
前記粘着テープの厚さは、使用する態様によって適宜調整すれば良いが、350μm~2000μmであることが好ましい。電子機器の部品固定用、特に小型、薄型の携帯電子機器の部品固定用に前記粘着テープを使用する場合、比較的薄い粘着テープが求められるため、前記粘着テープとしては、400μm~1900μmの厚さのものを使用することが好ましく、400μm~1600μmの厚さのものを使用することが、薄型で小型の携帯電子機器に対して好適に適用でき、良好な防水機能を付与することが可能となる。
The thickness of the adhesive tape may be appropriately adjusted depending on the mode of use, but is preferably 350 μm to 2000 μm. When the adhesive tape is used for fixing electronic device parts, particularly for fixing small and thin portable electronic device parts, a relatively thin adhesive tape is required. Therefore, the adhesive tape has a thickness of 400 μm to 1900 μm. It is preferable to use one having a thickness of 400 μm to 1600 μm, which can be suitably applied to a thin and small portable electronic device and can provide a good waterproof function. .
本発明の粘着テープは、発泡体基材と粘着剤層とを積層することによって製造することができる。
The pressure-sensitive adhesive tape of the present invention can be produced by laminating a foam base material and a pressure-sensitive adhesive layer.
[発泡体基材]
前記発泡体基材は、本発明の粘着テープの発泡体基材層を構成する。 [Foam substrate]
The said foam base material comprises the foam base material layer of the adhesive tape of this invention.
前記発泡体基材は、本発明の粘着テープの発泡体基材層を構成する。 [Foam substrate]
The said foam base material comprises the foam base material layer of the adhesive tape of this invention.
前記発泡体基材としては、300μm以上の厚さであるものを使用することが好ましく、350μm~1800μmの厚さであるものを使用することがより好ましく、450μm~1500μmの厚さであるものを使用することが、各種部品を良好に固定でき、かつ、より一層好適なタッチフィードバック特性を備えた粘着テープを得るうえでさらに好ましい。さらに好ましい。前記粘着テープとして、2以上の発泡体基材層を有する粘着テープを製造する場合には、前記発泡体基材層の厚さの合計が前記範囲の厚さであることが好ましい。
As the foam base material, it is preferable to use one having a thickness of 300 μm or more, more preferably one having a thickness of 350 μm to 1800 μm, and one having a thickness of 450 μm to 1500 μm. It is more preferable to use it in order to obtain a pressure-sensitive adhesive tape that can fix various components satisfactorily and has a more suitable touch feedback characteristic. Further preferred. When manufacturing the adhesive tape which has a 2 or more foam base material layer as said adhesive tape, it is preferable that the sum total of the thickness of the said foam base material layer is the thickness of the said range.
前記発泡体基材としては、粘着テープの圧縮変位量を好適な範囲に調整しやすく、より一層好適なタッチフィードバック特性と、優れた耐衝撃性と、被着体との優れた密着性とを両立するうえで、0.03g/cm3~0.25g/cm3の見かけ密度を有するものを使用することが好ましく、0.06g/cm3~0.25g/cm3の見かけ密度を有するものを使用することがより好ましく、0.1g/cm3~0.21g/cm3の見かけ密度を有するものを使用することがさらに好ましい。なお、前記見かけ密度は、JISK6767に準じ、4cm×5cmの長方形に切断した発泡体基材を約15cm3分用意し、その質量を測定することによって算出した値である。
As the foam substrate, it is easy to adjust the amount of compression displacement of the adhesive tape to a suitable range, and more suitable touch feedback characteristics, excellent impact resistance, and excellent adhesion to the adherend. In order to achieve both, it is preferable to use a material having an apparent density of 0.03 g / cm 3 to 0.25 g / cm 3 , and a material having an apparent density of 0.06 g / cm 3 to 0.25 g / cm 3 Is more preferable, and one having an apparent density of 0.1 g / cm 3 to 0.21 g / cm 3 is more preferable. The apparent density is a value calculated by preparing a foam base material cut into a 4 cm × 5 cm rectangle according to JIS K6767 for about 15 cm 3 minutes and measuring its mass.
前記発泡体基材の25%圧縮強度は、10kPa~300kPaであることが好ましく、20kPa~200kPaであることがより好ましく、20kPa~150kPaであることがさらに好ましく、20kPa~100kPaであることが、より一層好適なタッチフィードバック特性と、被着体表面の凹凸への追従性とを両立した粘着テープを得ることができるためさらに好ましい。
The 25% compressive strength of the foam base material is preferably 10 kPa to 300 kPa, more preferably 20 kPa to 200 kPa, further preferably 20 kPa to 150 kPa, and more preferably 20 kPa to 100 kPa. It is more preferable because an adhesive tape having both more suitable touch feedback characteristics and followability to unevenness of the adherend surface can be obtained.
なお、25%圧縮強度は、JISK6767に準じ、25mm角に切断した発泡体基材を厚さ約10mmになるまで重ね合わせた試験片を用意し、前記試験片より大きな面積のステンレス板でそれをはさみ、23℃下で10mm/分の速度で、前記試験片を約2.5mm(もとの厚さの25%分)圧縮した時の強度を測定することによって得られた値である。
For 25% compressive strength, in accordance with JISK6767, prepare a test piece in which a foam base material cut into 25 mm squares is stacked to a thickness of about 10 mm, and use a stainless steel plate with a larger area than the test piece. It is a value obtained by measuring the strength when the test piece is compressed about 2.5 mm (25% of the original thickness) at 23 ° C. at a speed of 10 mm / min.
前記発泡体基材としては、その流れ方向および幅方向の平均気泡径が10μm~700μmの範囲に調整されたものを使用することが好ましく、30μm~500μmの範囲に調整されたものを使用することがより好ましく、50μm~400μmの範囲に調整されたものを使用することが、発泡体基材の単位幅あたりに存在する独立気泡の数を一定量確保しやすく、前記粘着テープの圧縮時の変位量を好適な範囲としやすく、より一層優れた密着性及び耐衝撃性を備えた粘着テープを得やすいためさらに好ましい。
As the foam base material, it is preferable to use those whose average cell diameter in the flow direction and width direction is adjusted in the range of 10 μm to 700 μm, and those adjusted in the range of 30 μm to 500 μm are used. It is more preferable to use the one adjusted to the range of 50 μm to 400 μm, and it is easy to secure a certain number of closed cells per unit width of the foam base material, and the pressure-sensitive adhesive tape is displaced when compressed. Since it is easy to make the amount into a suitable range and it is easy to obtain a pressure-sensitive adhesive tape having more excellent adhesion and impact resistance, it is further preferable.
前記流れ方向と幅方向の平均気泡径の比(流れ方向における平均気泡径/厚さ方向における平均気泡径)は特に限定されないが、0.25~4倍であることが好ましく、0.33~3倍であることがより好ましく、0.5~2.3倍であることがさらに好ましく、0.7~1.3倍であることが特に好ましい。上記比率範囲であると発泡体基材の流れ方向と幅方向の柔軟性や引張強度のばらつきが生じにくい。
The ratio of the average bubble diameter in the flow direction and the width direction (average bubble diameter in the flow direction / average bubble diameter in the thickness direction) is not particularly limited, but is preferably 0.25 to 4 times, preferably 0.33 to It is more preferably 3 times, more preferably 0.5 to 2.3 times, and particularly preferably 0.7 to 1.3 times. Within the above ratio range, variations in flexibility and tensile strength in the flow direction and width direction of the foam substrate are unlikely to occur.
前記発泡体基材の厚さ方向の平均気泡径は、10μm~150μmであることが好ましく、15μm~100μmであることがより好ましい。厚さ方向の平均気泡径を当該範囲とすることで、好適な追従性とクッション性を実現でき、剛体同士の接合においても優れた密着性を実現しやすくなる。また、当該厚さ方向の平均気泡径は、発泡体基材の厚さに対して1/2以下、好ましくは1/3以下であることが、前記した好ましい範囲の見かけ密度や強度を備えた発泡体基材を得やすいため好ましい。また、得られる粘着テープの厚さ方向に5N/cm2の荷重で圧縮した際の変位量が130μm以上である場合であっても、好適な強度を確保しやすい。
The average cell diameter in the thickness direction of the foam substrate is preferably 10 μm to 150 μm, and more preferably 15 μm to 100 μm. By setting the average cell diameter in the thickness direction within this range, suitable followability and cushioning properties can be realized, and excellent adhesion can be easily achieved even when joining rigid bodies. In addition, the average cell diameter in the thickness direction is 1/2 or less, preferably 1/3 or less of the thickness of the foam base material, and the apparent density and strength in the preferable range described above are provided. Since it is easy to obtain a foam base material, it is preferable. Moreover, it is easy to ensure a suitable strength even when the displacement amount when compressed with a load of 5 N / cm 2 in the thickness direction of the obtained adhesive tape is 130 μm or more.
発泡体基材の厚さ方向における平均気泡径に対する発泡体基材の流れ方向における平均気泡径の比(流れ方向における平均気泡径/厚さ方向における平均気泡径)、および、発泡体基材の厚さ方向における平均気泡径に対する、発泡体基材の幅方向における平均気泡径の比(幅方向における平均気泡径/厚さ方向における平均気泡径)は、ともに1~15であることが好ましく、1.5~10であることがより好ましく、2~8であることがさらに好ましい。前記範囲の比率とすることで、落下衝撃時の発泡体層間破壊に対する耐久性を向上させやすく、また、厚さ方向に好適な追従性とクッション性を確保しやすくなり、剛体同士の接合においても、水や粉じんが入り込む隙間を生じさせない良好な密着性を実現しやすくなる。また、得られる粘着テープを圧縮した際の変位量を前記した範囲に調整しやすい。
The ratio of the average bubble diameter in the flow direction of the foam substrate to the average bubble diameter in the thickness direction of the foam substrate (average bubble diameter in the flow direction / average bubble diameter in the thickness direction), and The ratio of the average bubble diameter in the width direction of the foam substrate to the average bubble diameter in the thickness direction (average bubble diameter in the width direction / average bubble diameter in the thickness direction) is preferably both 1 to 15, It is more preferably 1.5 to 10, and further preferably 2 to 8. By setting the ratio in the above range, it is easy to improve the durability against foam interlaminar fracture at the time of a drop impact, and it becomes easy to ensure suitable followability and cushioning properties in the thickness direction, even in the joining of rigid bodies It becomes easy to realize good adhesion without causing a gap for water and dust to enter. Moreover, it is easy to adjust the displacement amount at the time of compressing the obtained adhesive tape to the above-mentioned range.
なお、発泡体基材の幅方向と流れ方向、厚さ方向の平均気泡径は、下記の要領で測定する。まず、発泡体基材を幅方法、流れ方向とも約1cmに切断する。次に、切断した発泡体基材の切断面中央部分をデジタルマイクロスコープ(商品名「KH-7700」、HiROX社製)により、発泡体気泡部分を200倍に拡大したのち、発泡体基材の幅方向または流れ方向の断面を発泡体基材の切断面がその基材厚さ方向の全長に亘って写真に収まるように発泡体基材の幅方向または流れ方向の断面を撮影する。得られた拡大画像において、流れ方向または幅方向の拡大前の実際の長さが2mm分の切断面に存在する気泡の気泡径を全て測定し、その平均値から観察した部分の平均気泡径を算出する。任意の10カ所で測定した結果から発泡体基材の平均気泡径を求める。
The average cell diameter in the width direction, flow direction, and thickness direction of the foam substrate is measured as follows. First, the foam base material is cut to about 1 cm in both the width method and the flow direction. Next, after the foam cell part was enlarged 200 times by a digital microscope (trade name “KH-7700”, manufactured by HiROX) at the center of the cut surface of the foam base material, The cross section in the width direction or the flow direction is taken so that the cross section in the width direction or the flow direction fits in the photograph over the entire length in the thickness direction of the base material. In the obtained enlarged image, measure all the bubble diameters of the bubbles existing on the cut surface of the actual length before the enlargement in the flow direction or the width direction for 2 mm, and the average bubble diameter of the portion observed from the average value calculate. The average cell diameter of the foam substrate is determined from the results of measurement at any 10 locations.
本発明に使用する発泡体基材の気泡構造は独立気泡構造とすることにより、発泡体基材の切断面からの浸水または粉じんを効果的に防ぐことができるため好ましい。独立気泡構造を形成する気泡の形状は、発泡体の厚さ方向の平均気泡径より、流れ方向や幅方向、もしくはその両方の平均気泡径が長い形状の独立気泡とすることにより、適度な追従性とクッション性を有するので好ましい。
The cell structure of the foam base material used in the present invention is preferably a closed cell structure because water or dust from the cut surface of the foam base material can be effectively prevented. The shape of the bubbles forming the closed cell structure is moderate following by using closed cells with a longer average bubble size in the flow direction, width direction, or both than the average bubble size in the thickness direction of the foam. It is preferable because it has a good cushioning property.
本発明に使用する発泡体基材は、流れ方向と幅方向の引張強さは特に限定されないが、それぞれ50N/cm2以上であることが好ましく、50N/cm2~700N/cm2であることがより好ましい。また、引張試験における切断時の引張伸度は特に限定されないが、流れ方向の引張伸度が100%~1200%であることが好ましく、200%~1000%であることがより好ましく、200%~600%であることがさらに好ましい。前記した範囲の引張強さ及び引張伸度を備えた発泡体基材を使用することによって、
粘着テープの良好な加工性や貼付作業性を維持することができる。 The foam base material used in the present invention is not particularly limited in the tensile strength in the flow direction and the width direction, but is preferably 50 N / cm 2 or more and 50 N / cm 2 to 700 N / cm 2 respectively. Is more preferable. Further, the tensile elongation at the time of cutting in the tensile test is not particularly limited, but the tensile elongation in the flow direction is preferably 100% to 1200%, more preferably 200% to 1000%, and more preferably 200% to More preferably, it is 600%. By using a foam substrate with a tensile strength and tensile elongation in the ranges described above,
Good processability and sticking workability of the adhesive tape can be maintained.
粘着テープの良好な加工性や貼付作業性を維持することができる。 The foam base material used in the present invention is not particularly limited in the tensile strength in the flow direction and the width direction, but is preferably 50 N / cm 2 or more and 50 N / cm 2 to 700 N / cm 2 respectively. Is more preferable. Further, the tensile elongation at the time of cutting in the tensile test is not particularly limited, but the tensile elongation in the flow direction is preferably 100% to 1200%, more preferably 200% to 1000%, and more preferably 200% to More preferably, it is 600%. By using a foam substrate with a tensile strength and tensile elongation in the ranges described above,
Good processability and sticking workability of the adhesive tape can be maintained.
なお、前記発泡体基材の流れ方向と幅方向の引張強さは、JISK6767に準じ、標線長さ2cm、幅1cmのサンプルを、テンシロン引張試験機を用い、23℃及び50%RHの環境下において、引張速度300mm/minの測定条件で測定した最大強度である。
In addition, the tensile strength in the flow direction and the width direction of the foam base material is an environment of 23 ° C. and 50% RH in accordance with JISK6767 using a sample with a marked length of 2 cm and a width of 1 cm using a Tensilon tensile tester. Below, it is the maximum intensity | strength measured on the measurement conditions of 300 mm / min of tensile speeds.
発泡体基材の圧縮強度、密度、層間強度および引張強さなどは、使用する発泡体基材の素材や発泡構造により適宜調整することができる。
Compressive strength, density, interlayer strength, tensile strength, etc. of the foam base material can be appropriately adjusted depending on the material and foam structure of the foam base material to be used.
前記発泡体基材としては、例えばポリエチレン、ポリプロピレン、エチレン-プロピレン共重合体、エチレン-酢酸ビニル共重合体等からなるポリオレフィンを用いて得られるポリオレフィン系発泡体、ポリウレタン系発泡体、アクリル系発泡体、その他のゴム系発泡体等を使用することができる。
Examples of the foam base material include polyolefin-based foams, polyurethane-based foams, and acrylic-based foams obtained using polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and the like. Other rubber-based foams can be used.
前記発泡体基材としては、前記したなかでも、前記変位量を所定の範囲に調整しやすく、被着体表面の凹凸への追従性や緩衝吸収性等に優れた独立気泡構造の発泡体基材を作製しやすいため、ポリオレフィン系発泡体を使用することが好ましい。
Among the above-mentioned foam base materials, among the above-mentioned, a foam base having a closed cell structure that is easy to adjust the amount of displacement within a predetermined range, and has excellent conformability to the unevenness of the adherend surface, buffer absorbability, and the like. Since it is easy to produce a material, it is preferable to use a polyolefin-based foam.
前記ポリオレフィン系樹脂を使用したポリオレフィン系発泡体基材としては、ポリエチレン系樹脂を用いて得られた発泡体基材を使用することが、比較的均一な厚さで、かつ、より一層好適な柔軟性を備えるため好ましい。
As the polyolefin-based foam base material using the polyolefin-based resin, it is possible to use a foam base material obtained using a polyethylene-based resin with a relatively uniform thickness and a more suitable flexibility. It is preferable because it has the characteristics.
前記ポリオレフィン系樹脂に含まれる前記ポリエチレン系樹脂の含有量は、40質量%以上であることが好ましく、50質量%以上であることがより好ましく、60質量%以上であることが更に好ましく、100質量%であることが特に好ましい。
The content of the polyethylene resin contained in the polyolefin resin is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 60% by mass or more, and 100% by mass. % Is particularly preferred.
また、前記ポリオレフィン系発泡体の製造に使用可能なポリエチレン系樹脂としては、例えば直鎖状低密度ポリエチレン、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、エチレンを50重量%以上含有するエチレン-α-オレフィン共重合体、エチレンを50重量%以上含有するエチレン-酢酸ビニル共重合体等を、単独で使用または二種以上併用することができる。
Examples of the polyethylene resin that can be used in the production of the polyolefin foam include linear low density polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene, and ethylene-α containing 50% by weight or more of ethylene. An olefin copolymer, an ethylene-vinyl acetate copolymer containing 50% by weight or more of ethylene can be used alone or in combination of two or more.
前記エチレン-α-オレフィン共重合体を構成するα-オレフィンとしては、例えば、プロピレン、1-ブテン、1-ペンテン、4-メチル-1-ペンテン、1-ヘキセン、1-ヘプテン、1-オクテンなどが挙げられる。
Examples of the α-olefin constituting the ethylene-α-olefin copolymer include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. Is mentioned.
前記ポリプロピレン系樹脂としては、特には限定されず、例えば、ポリプロピレン、プロピレンを50重量%以上含有するプロピレン-α-オレフィン共重合体などが挙げられ、これらは単独で使用されても二種以上が併用されてもよい。プロピレン-α-オレフィン共重合体を構成するα-オレフィンとしては、例えば、エチレン、1-ブテン、1-ペンテン、4-メチル-1-ペンテン、1-ヘキセン、1-ヘプテン、1-オクテンなどが挙げられる。
The polypropylene resin is not particularly limited, and examples thereof include polypropylene and a propylene-α-olefin copolymer containing 50% by weight or more of propylene. These may be used alone or in combination of two or more. You may use together. Examples of the α-olefin constituting the propylene-α-olefin copolymer include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. Can be mentioned.
前記ポリエチレン系樹脂としては、前記したなかでも重合触媒として四価の遷移金属を含むメタロセン化合物を用いて得られる分子量分布の狭いポリエチレン系樹脂を使用することが好ましい。また、前記方法で得られるポリエチレン系樹脂は、いずれの分子量を有するポリエチレン系樹脂であっても、その共重合成分の共重合割合をほぼ等しく調整することができ、その結果、ほぼ均一に架橋されたポリオレフィン系発泡体を得ることができる。前記ほぼ均一に架橋されたポリオレフィン系発泡体は、延伸させやすく、また、その厚さを全体的に均一なものとしやすい。
As the polyethylene resin, it is preferable to use a polyethylene resin having a narrow molecular weight distribution obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst. In addition, the polyethylene resin obtained by the above method can adjust the copolymerization ratio of the copolymerization component to be almost equal even if it is a polyethylene resin having any molecular weight. A polyolefin foam can be obtained. The substantially uniformly crosslinked polyolefin-based foam can be easily stretched, and the thickness thereof can be easily uniformed as a whole.
前記ポリオレフィン系発泡体基材は、架橋構造を有していてもよい。ポリオレフィン系樹脂シートを熱分解型発泡剤などで発泡させることによってポリオレフィン系発泡体を製造する場合は、前記架橋構造を形成すべく設計することが好ましい。架橋度は5質量%~60質量%の範囲であることが好ましく、10質量%~55質量%の範囲であることが、粘着剤層との良好な密着性と、タッチフィードバック特性と、耐衝撃性とをより一層向上するうえでより好ましい。
The polyolefin-based foam substrate may have a crosslinked structure. When producing a polyolefin-based foam by foaming a polyolefin-based resin sheet with a pyrolytic foaming agent or the like, it is preferable to design to form the crosslinked structure. The degree of cross-linking is preferably in the range of 5% by mass to 60% by mass, and in the range of 10% by mass to 55% by mass is good adhesion to the adhesive layer, touch feedback characteristics, and impact resistance. It is more preferable for further improving the properties.
前記架橋度の測定は以下の方法で行うことができる。40mm×50mm角の発泡体基材5枚一組を試料とし、その合計質量(G1)を測定する。次に、試料をキシレン中に120℃で24時間浸漬した後、キシレン不溶解分を300メッシュ金網で濾過することにより分離し、110℃で1時間乾燥した後の残渣の質量(G2)を測定する。以下の式に従って求めるキシレン不溶分を架橋度とする。
The degree of crosslinking can be measured by the following method. A set of five 40 mm × 50 mm square foam base materials is used as a sample, and the total mass (G1) is measured. Next, after immersing the sample in xylene at 120 ° C. for 24 hours, the xylene-insoluble matter was separated by filtration through a 300 mesh wire net, and the residue mass (G2) after drying at 110 ° C. for 1 hour was measured. To do. The xylene-insoluble content determined according to the following formula is defined as the degree of crosslinking.
架橋度(質量%)=(G2/G1)×100
Degree of crosslinking (% by mass) = (G2 / G1) × 100
前記ポリオレフィン系発泡体の製造方法としては、特に限定されず、例えば、重合触媒として四価の遷移金属を含むメタロセン化合物を用いて得られたポリエチレン系樹脂を40重量%以上含有するポリオレフィン系樹脂及び熱分解型発泡剤と発泡助剤、発泡体を黒色や白色などに着色するための着色剤等を含有するポリオレフィン系樹脂組成物を押出機に供給して溶融混練し、押出機からシート状に押出すことによってポリオレフィン系樹脂シートを製造する工程と、前記ポリオレフィン系樹脂シートを架橋させる工程と、前記ポリオレフィン系樹脂シートを発泡させる工程と、得られた発泡シートを溶融又は軟化させ、流れ方向或いは幅方向の何れか一方又は双方の方向に向かって延伸させて発泡シートを延伸する工程を含有する方法が挙げられる。なお、発泡シートを延伸する工程は必要に応じて行われればよく、複数回行われてもよい。
The method for producing the polyolefin foam is not particularly limited. For example, a polyolefin resin containing 40% by weight or more of a polyethylene resin obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, and A polyolefin-based resin composition containing a pyrolytic foaming agent, a foaming aid, and a colorant for coloring the foam in black or white is supplied to an extruder and melt-kneaded. From the extruder into a sheet form A step of producing a polyolefin-based resin sheet by extrusion, a step of crosslinking the polyolefin-based resin sheet, a step of foaming the polyolefin-based resin sheet, and melting or softening the obtained foamed sheet, A method comprising a step of stretching a foam sheet by stretching in either or both of the width directions And the like. In addition, the process of extending | stretching a foam sheet should just be performed as needed, and may be performed in multiple times.
前記熱分解型発泡剤としては、従来から発泡体の製造に用いられているものであれば特に限定されず、例えば、アゾジカルボンアミド、N,N‘-ジニトロソペンタメチレンテトラミン、p-トルエンスルホニルセミカルバジドなどが挙げられ、中でもアゾジカルボンアミドが好ましい。なお、熱分解型発泡剤は単独でも二種類以上が併用されていてもよい。
The pyrolytic foaming agent is not particularly limited as long as it is conventionally used in the production of foams. For example, azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, p-toluenesulfonyl Semicarbazide and the like can be mentioned, and among them, azodicarbonamide is preferable. In addition, a thermal decomposition type foaming agent may be individual, or 2 or more types may be used together.
前記熱分解型発泡剤の添加量は、ポリオレフィン系発泡体の発泡倍率に応じて適宜決定してよいが、ポリオレフィン系樹脂100質量部に対して1質量部~40質量部であることが好ましく、1質量部~30質量部であることが、所望の発泡倍率に調整することが容易で、粘着テープの前記変位量を所定範囲に調整しやすいため好ましい。
The amount of the pyrolytic foaming agent added may be appropriately determined according to the foaming ratio of the polyolefin foam, but is preferably 1 part by weight to 40 parts by weight with respect to 100 parts by weight of the polyolefin resin. The amount of 1 to 30 parts by mass is preferable because it is easy to adjust to a desired foaming ratio and the amount of displacement of the adhesive tape is easily adjusted to a predetermined range.
前記発泡体基材としては、意匠性、遮光性、隠蔽性、光反射性、耐光性等を備えた粘着テープを得るうえで、着色された発泡体基材を使用してもよい。前記着色の際には、従来知られる着色剤を、単独または2種類以上組み合わせて用いることができる。
As the foam base material, a colored foam base material may be used in order to obtain an adhesive tape having design properties, light shielding properties, concealing properties, light reflectivity, light resistance, and the like. In the case of the said coloring, a conventionally known coloring agent can be used individually or in combination of 2 or more types.
粘着テープに遮光性や隠蔽性や耐光性を付与する場合、前記発泡体基材としては、黒色に着色されたものを使用することが好ましい。
When the light-shielding property, the concealing property and the light resistance are imparted to the adhesive tape, it is preferable to use a material colored black as the foam base material.
前記黒色の着色剤としては、例えばカーボンブラック、グラファイト、酸化銅、二酸化マンガン、アニリンブラック、ペリレンブラック、チタンブラック、シアニンブラック、活性炭、フェライト、マグネタイト、酸化クロム、酸化鉄、二硫化モリブデン、クロム錯体、複合酸化物系黒色色素、アントラキノン系有機黒色色素などを用いることができる。なかでも、前記着色剤としては、コスト、入手性、絶縁性、ポリオレフィン系樹脂組成物を押し出す工程や加熱発泡工程の温度に耐えうるレベルの耐熱性の観点から、カーボンブラックを使用することが好ましい。
Examples of the black colorant include carbon black, graphite, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, cyanine black, activated carbon, ferrite, magnetite, chromium oxide, iron oxide, molybdenum disulfide, and chromium complex. , Complex oxide black dyes, anthraquinone organic black dyes, and the like can be used. Among these, as the colorant, it is preferable to use carbon black from the viewpoint of cost, availability, insulation, and heat resistance at a level that can withstand the temperature of the process of extruding the polyolefin resin composition and the heating and foaming process. .
また、前記粘着テープに意匠性や光反射性などを付与する場合、前記発泡体基材としては、白色に着色されたものを使用することが好ましい。
In addition, when the design and light reflectivity are imparted to the adhesive tape, it is preferable to use a white colored one as the foam base material.
前記白色着色剤としては、例えば酸化チタン、酸化亜鉛、酸化アルミニウム、酸化ケイ素、酸化マグネシウム、酸化ジルコニウム、酸化カルシウム、酸化スズ、酸化バリウム、酸化セシウム、酸化イットリウム、炭酸マグネシウム、炭酸カルシウム、炭酸バリウム、炭酸亜鉛、水酸化アルミニウム、水酸化マグネシウム、水酸化カルシウム、水酸化亜鉛、ケイ酸アルミニウム、ケイ酸カルシウム、硫酸バリウム、硫酸カルシウム、ステアリン酸バリウム、亜鉛華、タルク、シリカ、アルミナ、クレー、カオリン、リン酸チタン、マイカ、石膏、ホワイトカーボン、珪藻土、ベントナイト、リトポン、ゼオライト、セリサイト、などの無機系白色着色剤やシリコーン系樹脂粒子、アクリル系樹脂粒子、ウレタン系樹脂粒子、メラミン系樹脂粒子などの有機系白色着色剤などを用いることができる。なかでも、前記着色剤としては、コスト、入手性、色調、発泡性ポリオレフィン系樹脂組成物を押し出す工程や加熱発泡工程の温度に耐える耐熱性の観点から、酸化チタンや酸化アルミニウムや酸化亜鉛を使用することが好ましい。
Examples of the white colorant include titanium oxide, zinc oxide, aluminum oxide, silicon oxide, magnesium oxide, zirconium oxide, calcium oxide, tin oxide, barium oxide, cesium oxide, yttrium oxide, magnesium carbonate, calcium carbonate, barium carbonate, Zinc carbonate, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc hydroxide, aluminum silicate, calcium silicate, barium sulfate, calcium sulfate, barium stearate, zinc white, talc, silica, alumina, clay, kaolin, Inorganic white colorants such as titanium phosphate, mica, gypsum, white carbon, diatomaceous earth, bentonite, lithopone, zeolite, sericite, silicone resin particles, acrylic resin particles, urethane resin particles, melamine resin particles And the like can be used organic white colorants such as. Among these, as the colorant, titanium oxide, aluminum oxide, and zinc oxide are used from the viewpoint of cost, availability, color tone, heat resistance that can withstand the temperature of the process of extruding the foamable polyolefin resin composition and the heating foaming process. It is preferable to do.
前記発泡体基材は、必要に応じて、可塑剤、酸化防止剤、酸化亜鉛などの発泡助剤、気泡核調整材、熱安定剤、水酸化アルミニウムや水酸化マグネシウムなどの難燃剤、帯電防止剤、ガラス製やプラスチック製の中空バルーン・ビーズ、金属粉末、金属化合物等の充填材、導電性フィラー、熱伝導性フィラーなどの公知のものを含有するものであってもよい。
If necessary, the foam base material may be a plasticizer, an antioxidant, a foaming aid such as zinc oxide, a cell core modifier, a heat stabilizer, a flame retardant such as aluminum hydroxide or magnesium hydroxide, and an antistatic agent. It may contain known agents such as agents, fillers such as glass or plastic hollow balloons / beads, metal powders, metal compounds, conductive fillers, and heat conductive fillers.
なお、前記着色剤や熱分解性発泡剤や発泡助剤等は、色の濃淡ムラなどの外観不良や、過剰な発泡や無発泡などの発泡不良を防止するうえで、ポリオレフィン系樹脂、または、前記ポリオレフィン系樹脂と相溶しやすい他の熱可塑性樹脂によってマスターバッチ化されていることが好ましい。
In addition, the colorant, the thermally decomposable foaming agent, the foaming auxiliary agent, etc., in order to prevent poor appearance such as uneven color shading, and poor foaming such as excessive foaming and non-foaming, a polyolefin resin, or It is preferable that the masterbatch is made of another thermoplastic resin that is easily compatible with the polyolefin resin.
ポリオレフィン系発泡体基材を架橋させる方法としては、例えば、ポリオレフィン系発泡体基材に電離性放射線を照射する方法、発泡性ポリオレフィン系樹脂組成物に予め有機過酸化物を配合しておき、得られたポリオレフィン系発泡体基材を加熱して有機過酸化物を分解させる方法などが挙げられ、これらの方法は併用されてもよい。
Examples of the method of crosslinking the polyolefin foam substrate include, for example, a method of irradiating the polyolefin foam substrate with ionizing radiation, an organic peroxide blended in advance in the foamable polyolefin resin composition, The method of heating the obtained polyolefin-type foam base material and decomposing | disassembling an organic peroxide etc. is mentioned, These methods may be used together.
電離性放射線としては、電子線、α線、β線、γ線などが挙げられる。電離性放射線の線量は、ポリオレフィン系発泡体基材の架橋度が前記の好ましい範囲になるように適宜調整できるが、5kGy~200kGyの範囲であることが好ましい。また、電離性放射線の照射は、均一な発泡状態を得やすいことから、ポリオレフィン系発泡体基材の両面に照射するのが好ましく、両面に照射する線量を同じにするのがより好ましい。
Examples of ionizing radiation include electron beams, α rays, β rays, and γ rays. The dose of ionizing radiation can be appropriately adjusted so that the cross-linking degree of the polyolefin-based foam substrate is within the above preferred range, but is preferably in the range of 5 kGy to 200 kGy. Moreover, since it is easy to obtain a uniform foamed state, it is preferable to irradiate both surfaces of the polyolefin-based foam base material, and it is more preferable that the radiation dose to both surfaces be the same.
有機過酸化物としては、例えば、1,1-ビス(t-ブチルパーオキシ)3,3,5-トリメチルシクロヘキサン、1,1-ビス(t-ブチルパーオキシ)シクロヘキサン、2,2-ビス(t-ブチルパーオキシ)オクタン、n-ブチル-4,4-ビス(t-ブチルパーオキシ)バレレート、ジ-t-ブチルパーオキサイド、t-ブチルクミルパーオキサイド、ジクミルパーオキサイド、α,α’-ビス(t-ブチルパーオキシ-m-イソプロピル)ベンゼン、2,5-ジメチル-2,5-ジ(t-ブチルパーオキシ)ヘキサン、2,5-ジメチル-2,5-ジ(t-ブチルパーオキシ)ヘキシン-3、ベンゾイルパーオキサイド、クミルパーオキシネオデカネート、t-ブチルパーオキシベンゾエート、2,5-ジメチル-2,5-ジ(ベンゾイルパーオキシ)ヘキサン、t-ブチルパーオキシイソプロピルカーボネート、t-ブチルパーオキシアリルカーボネートなどが挙げられ、これらは単独で用いられても二種以上が併用されてもよい。
Examples of the organic peroxide include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 2,2-bis ( t-butylperoxy) octane, n-butyl-4,4-bis (t-butylperoxy) valerate, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, α, α ′ -Bis (t-butylperoxy-m-isopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butyl) Peroxy) hexyne-3, benzoyl peroxide, cumyl peroxyneodecanate, t-butyl peroxybenzoate, 2,5-dimethyl-2,5-di Nzoylperoxy) hexane, t-butylperoxyisopropyl carbonate, t-butylperoxyallyl carbonate, and the like. These may be used alone or in combination of two or more.
前記有機過酸化物は、前記ポリオレフィン系樹脂100質量部に対し、0.01質量部~5質量部の範囲であることが好ましく、0.1質量部~3質量部の範囲であることが、前記有機過酸化物の分解残渣の残留を抑制でき、粘着テープの厚さ方向に圧縮した際の前記変位量を所定の範囲に設定しやすいため好ましい。
The organic peroxide is preferably in the range of 0.01 parts by mass to 5 parts by mass, and in the range of 0.1 parts by mass to 3 parts by mass with respect to 100 parts by mass of the polyolefin resin. Since the residue of the decomposition | disassembly residue of the said organic peroxide can be suppressed and it is easy to set the said displacement amount at the time of compressing to the thickness direction of an adhesive tape, it is preferable.
また、ポリオレフィン系樹脂シートを発泡させる方法としては、特には限定されず、例えば、熱風により加熱する方法、赤外線により加熱する方法、塩浴による方法、オイルバスによる方法などが挙げられ、これらは併用してもよい。なかでも熱風により加熱する方法や赤外線により加熱する方法が、ポリオレフィン系発泡体基材の表裏面の外観の差異が少なくなるため好ましい。
The method of foaming the polyolefin resin sheet is not particularly limited, and examples thereof include a method of heating with hot air, a method of heating with infrared rays, a method using a salt bath, a method using an oil bath, and the like. May be. Among them, the method of heating with hot air or the method of heating with infrared rays is preferable because the difference in appearance between the front and back surfaces of the polyolefin-based foam substrate is reduced.
前記発泡体基材は、延伸されていてもよい。前記延伸は、ポリオレフィン系樹脂シートを発泡させて発泡体基材を得た後に行ってもよいし、ポリオレフィン系樹脂シートを発泡させる際に行ってもよい。
The foam base material may be stretched. The stretching may be performed after foaming the polyolefin resin sheet to obtain a foam substrate, or may be performed when foaming the polyolefin resin sheet.
ポリオレフィン系樹脂シートを発泡させて発泡体基材を得た後、発泡体基材を延伸する場合、発泡体基材を冷却することなく発泡時の溶融状態を維持したまま続けて発泡体基材を延伸しても、発泡体基材を冷却した後、再度、発泡シートを加熱して溶融又は軟化状態とした上で発泡体基材を延伸してもよい。
After foaming a polyolefin resin sheet to obtain a foam base material, when the foam base material is stretched, the foam base material is continuously maintained while maintaining the molten state at the time of foaming without cooling the foam base material. Even after stretching, the foam base material may be stretched after cooling the foam base material and heating the foam sheet again to a molten or softened state.
前記発泡体基材の溶融状態とは、発泡体基材を、発泡体基材を構成しているポリオレフィン系樹脂の融点以上に加熱した状態をいう。また、発泡体基材の軟化とは、発泡体基材を構成しているポリオレフィン系樹脂の軟化点以上融点未満までの温度に加熱した状態をいう。上記発泡体基材を延伸することによって、発泡体基材の気泡を所定方向に延伸し変形させて、気泡のアスペクト比が所定範囲内となったポリオレフィン系発泡体を製造することができる。
The molten state of the foam base material means a state in which the foam base material is heated to a melting point or higher of the polyolefin resin constituting the foam base material. Further, the softening of the foam base material refers to a state where the foam base material is heated to a temperature not lower than the melting point and lower than the melting point of the polyolefin resin constituting the foam base material. By stretching the foam base material, the foam of the foam base material can be produced by stretching the foam base material in a predetermined direction and deforming the foam base material so that the aspect ratio of the foam is within a predetermined range.
前記発泡体基材の延伸方向は、長尺状のポリオレフィン系樹脂シートの流れ方向若しくは幅方向に向かって、又は、流れ方向および幅方向であることが好ましい。なお、発泡体基材を流れ方向および幅方向に向かって延伸させる場合、発泡体基材を流れ方向および幅方向に向かって同時に延伸してもよいし、一方向ずつ別々に延伸してもよい。
The stretching direction of the foam substrate is preferably in the flow direction or the width direction of the long polyolefin resin sheet, or in the flow direction and the width direction. When the foam base material is stretched in the flow direction and the width direction, the foam base material may be stretched simultaneously in the flow direction and the width direction, or may be stretched separately one by one. .
上記発泡体基材を流れ方向に延伸する方法としては、例えば、長尺状のポリオレフィン系樹脂シートを発泡工程に供給する速度(供給速度)よりも、発泡後に長尺状のポリオレフィン系樹脂シートを冷却しながら巻き取る速度(巻取速度)を速くすることによって発泡体基材を流れ方向に延伸する方法、得られた発泡体基材を延伸工程に供給する速度(供給速度)よりも、発泡体基材を巻き取る速度(巻取速度)を速くすることによって発泡体基材を流れ方向に延伸する方法などが挙げられる。
As a method of stretching the foam base material in the flow direction, for example, a long polyolefin resin sheet after foaming is used rather than a speed (supply speed) at which the long polyolefin resin sheet is supplied to the foaming process. A method of stretching the foam base material in the flow direction by increasing the winding speed (winding speed) while cooling, foaming rather than the speed (supply speed) of supplying the obtained foam base material to the stretching process Examples include a method of stretching the foam base material in the flow direction by increasing the speed of winding the body base material (winding speed).
前記ポリオレフィン系樹脂シートは、それ自身の発泡によって流れ方向に膨張しやすいため、前記ポリオレフィン系樹脂シートを用いて得られた発泡体基材を流れ方向に延伸する場合には、ポリオレフィン系樹脂シートの発泡による流れ方向への膨張分を考慮し、その膨張分以上に、ポリオレフィン系樹脂シートが流れ方向に延伸されるように、発泡体基材の供給速度と巻取り速度とを調整することが好ましい。
Since the polyolefin resin sheet easily expands in the flow direction due to its own foaming, when the foam base material obtained using the polyolefin resin sheet is stretched in the flow direction, the polyolefin resin sheet Considering the amount of expansion in the flow direction due to foaming, it is preferable to adjust the supply speed and winding speed of the foam substrate so that the polyolefin resin sheet is stretched in the flow direction more than the expansion amount. .
前記発泡体基材を幅方向に延伸する方法としては、発泡体基材の幅方向の両端部を一対の把持部材によって把持し、この一対の把持部材を互いに離間する方向に徐々に移動させることによって発泡体基材を幅方向に延伸させる方法が好ましい。なお、ポリオレフィン系樹脂シートは、それ自身の発泡によって幅方向に膨張するので、発泡体基材を幅方向に延伸する場合には、ポリオレフィン系樹脂シートの発泡による幅方向への膨張分を考慮した上で、その膨張分以上に発泡体基材が幅方向に延伸されるように調整することが好ましい。
As a method of stretching the foam base material in the width direction, both ends in the width direction of the foam base material are gripped by a pair of gripping members, and the pair of gripping members are gradually moved in directions away from each other. A method of stretching the foam base material in the width direction is preferred. Since the polyolefin resin sheet expands in the width direction by its own foaming, when the foam base material is stretched in the width direction, the expansion in the width direction due to the foaming of the polyolefin resin sheet is taken into account. Above, it is preferable to adjust so that a foam base material may be extended | stretched in the width direction more than the expansion | swelling part.
前記発泡体基材の流れ方向における延伸倍率は1.1~5倍が好ましく、1.3~3.5倍がより好ましい。また、その幅方向における延伸倍率は1.2~4.5倍が好ましく、1.5~3.5倍がより好ましい。
The draw ratio in the flow direction of the foam substrate is preferably 1.1 to 5 times, more preferably 1.3 to 3.5 times. The draw ratio in the width direction is preferably 1.2 to 4.5 times, and more preferably 1.5 to 3.5 times.
前記発泡体基材としては、粘着剤層や他の層との密着性を向上させるため、コロナ処理、火炎処理、プラズマ処理、熱風処理、オゾン処理、紫外線処理、易接着処理等の表面処理の施されたものを使用することができる。
As the foam base material, surface treatment such as corona treatment, flame treatment, plasma treatment, hot air treatment, ozone treatment, ultraviolet treatment, and easy adhesion treatment is performed in order to improve the adhesion with the pressure-sensitive adhesive layer and other layers. The applied one can be used.
前記表面処理された発泡体基材の表面は、ぬれ試薬によるぬれ指数が36mN/m以上であることが好ましく、40mN/m以上であることが好ましく、48mN/m以上であることが、粘着剤層等との良好な密着性を維持するうえでさらに好ましい。
The surface of the surface-treated foam base material preferably has a wetting index by a wetting reagent of 36 mN / m or more, preferably 40 mN / m or more, and 48 mN / m or more. It is further preferable for maintaining good adhesion with a layer or the like.
密着性を向上させた発泡体基材は、連続工程で粘着剤層と貼り合わされてもよい。また、密着性を向上させた発泡体基材は一旦巻き取り加工をして保管したのち、後日粘着剤層と貼り合わされてもよい。
The foam base material with improved adhesion may be bonded to the adhesive layer in a continuous process. Further, the foam base material with improved adhesion may be temporarily wound up and stored, and then bonded to the adhesive layer at a later date.
なお、密着性を向上させた発泡体基材を一旦巻き取る場合、前記発泡体基材のブロッキングを防止するうえで、紙やポリエチレンやポリプロピレンやポリエステル等からなるフィルムを介して巻き取ることが好ましい。前記フィルムは、厚さ25μm以下のポリプロピレンフィルムやポリエステルフィルムであることが好ましい。
In addition, when winding up the foam base material having improved adhesion, it is preferable to wind it through a film made of paper, polyethylene, polypropylene, polyester, or the like in order to prevent blocking of the foam base material. . The film is preferably a polypropylene film or a polyester film having a thickness of 25 μm or less.
[粘着剤層]
本発明の粘着テープを構成する粘着剤層は、粘着剤を用いて形成することができる。 [Adhesive layer]
The pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention can be formed using a pressure-sensitive adhesive.
本発明の粘着テープを構成する粘着剤層は、粘着剤を用いて形成することができる。 [Adhesive layer]
The pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention can be formed using a pressure-sensitive adhesive.
前記粘着剤としては、例えば(メタ)アクリル系粘着剤、ウレタン系粘着剤、合成ゴム系粘着剤、天然ゴム系粘着剤、シリコーン系粘着剤などが挙げられるが、(メタ)アクリレートを含む単量体を重合して得られるアクリル系重合体と、必要に応じて粘着付与樹脂や架橋剤等の添加剤とを含有する(メタ)アクリル系粘着剤を好ましく使用できる。
Examples of the pressure-sensitive adhesive include (meth) acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, natural rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. A (meth) acrylic pressure-sensitive adhesive containing an acrylic polymer obtained by polymerizing the body and additives such as a tackifier resin and a crosslinking agent as required can be preferably used.
前記(メタ)アクリル系重合体を構成する(メタ)アクリレートとしては、例えば、メチル(メタ)アクリレート、エチル(メタ)アクリレート、n-ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、t-ブチル(メタ)アクリレート、n-ヘキシル(メタ)アクリレート、n-オクチル(メタ)アクリレート、イソオクチル(メタ)アクリレート、イソノニル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、デシル(メタ)アクリレート、ラウリル(メタ)アクリレート等の、炭素原子数1~12のアルキル基を有する(メタ)アクリレートを1種または2種以上が用いられる。なかでも、炭素原子数4~12のアルキル基を有する(メタ)アクリレートを使用することが好ましく、炭素原子数が4~8の直鎖または分岐状のアルキル基を有する(メタ)アクリレートを使用することが更に好ましい。特にn-ブチルアクリレートは、被着体との密着性を確保しやすく、凝集力や皮脂類への耐性に優れる粘着剤を得るうえで好ましい。
Examples of the (meth) acrylate constituting the (meth) acrylic polymer include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl ( (Meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, decyl (meth) One or more (meth) acrylates having an alkyl group having 1 to 12 carbon atoms, such as acrylate and lauryl (meth) acrylate, are used. Among them, it is preferable to use (meth) acrylate having an alkyl group having 4 to 12 carbon atoms, and (meth) acrylate having a linear or branched alkyl group having 4 to 8 carbon atoms is used. More preferably. In particular, n-butyl acrylate is preferable for obtaining a pressure-sensitive adhesive that is easy to ensure adhesion to an adherend and has excellent cohesive strength and resistance to sebum.
前記(メタ)アクリレートは、前記アクリル系重合体の製造に使用する単量体の全量に対して、80質量%~98.5質量%の範囲で使用することが好ましく、90質量%~98.5質量%の範囲で使用することがより好ましい。
The (meth) acrylate is preferably used in the range of 80% by mass to 98.5% by mass with respect to the total amount of monomers used for the production of the acrylic polymer, and 90% by mass to 98.%. It is more preferable to use in the range of 5% by mass.
また、本発明に使用するアクリル系重合体を製造する際には、前記単量体として極性ビニル単量体を使用することができる。前記極性ビニル単量体としては、水酸基を有するビニル単量体、カルボキシル基を有するビニル単量体、アミド基を有するビニル単量体等を1種または2種以上使用することができる。
Further, when the acrylic polymer used in the present invention is produced, a polar vinyl monomer can be used as the monomer. As the polar vinyl monomer, one or more vinyl monomers having a hydroxyl group, vinyl monomers having a carboxyl group, vinyl monomers having an amide group, and the like can be used.
水酸基を有するビニル単量体としては、例えば、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、6-ヒドロキシヘキシル(メタ)アクリレート等の水酸基を有する(メタ)アクリレートを使用できる。
Examples of the vinyl monomer having a hydroxyl group include hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate. (Meth) acrylates having the following can be used.
カルボキシル基を有するビニル単量体としては、アクリル酸、メタクリル酸、イタコン酸、マレイン酸、(メタ)アクリル酸2量体、クロトン酸、エチレンオキサイド変性琥珀酸アクリレート等を使用でき、なかでもアクリル酸を使用することが好ましい。
As vinyl monomers having a carboxyl group, acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth) acrylic acid dimer, crotonic acid, ethylene oxide-modified succinic acid acrylate, etc. can be used, among which acrylic acid Is preferably used.
また、アミド基を有するビニル単量体としては、N-ビニルピロリドン、N-ビニルカプロラクタム、(メタ)アクリロイルモルホリン、アクリルアミド、N,N-ジメチル(メタ)アクリルアミド、等が挙げられる。
Examples of the vinyl monomer having an amide group include N-vinylpyrrolidone, N-vinylcaprolactam, (meth) acryloylmorpholine, acrylamide, N, N-dimethyl (meth) acrylamide, and the like.
その他の極性ビニル単量体として、酢酸ビニル、2-アクリルアミド-2-メチルプロパンスルフォン酸等のスルホン酸基含有単量体等があげられる。
Other polar vinyl monomers include sulfonic acid group-containing monomers such as vinyl acetate and 2-acrylamido-2-methylpropane sulfonic acid.
極性ビニル単量体は、前記アクリル系重合体の製造に使用する単量体の全量に対し1.5質量%~20質量%の範囲で使用することが好ましく、1.5質量%~10質量%の範囲で使用することがより好ましく、2質量%~8質量%であることが更に好ましい。当該範囲で含有することにより、粘着剤の凝集力や保持力、接着性を好適な範囲に調整しやすい。
The polar vinyl monomer is preferably used in the range of 1.5% by mass to 20% by mass with respect to the total amount of monomers used for the production of the acrylic polymer, and 1.5% by mass to 10% by mass. % Is more preferable, and the content is more preferably 2% by mass to 8% by mass. By containing in the said range, it is easy to adjust the cohesive force, holding force, and adhesiveness of an adhesive to a suitable range.
なお、架橋剤としてイソシアネート系架橋剤を用いる場合は、これと反応する官能基を有するビニル単量体としては水酸基を有するビニル単量体が好ましく、2-ヒドロキシエチル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、6-ヒドロキシヘキシル(メタ)アクリレートが特に好ましい。イソシアネート系架橋剤と反応する水酸基を有するビニル単量体は、前記アクリル系重合体の製造に使用する単量体の全量に対し0.01質量%~1.0質量%の範囲で使用することが好ましく、0.03質量%~0.3質量%の範囲で使用することがより好ましい。
When an isocyanate-based crosslinking agent is used as the crosslinking agent, the vinyl monomer having a hydroxyl group is preferable as the vinyl monomer having a functional group that reacts therewith, such as 2-hydroxyethyl (meth) acrylate, 4-hydroxy Butyl (meth) acrylate and 6-hydroxyhexyl (meth) acrylate are particularly preferred. The vinyl monomer having a hydroxyl group that reacts with the isocyanate-based crosslinking agent should be used in the range of 0.01% by mass to 1.0% by mass with respect to the total amount of monomers used for the production of the acrylic polymer. It is preferable to use in the range of 0.03% by mass to 0.3% by mass.
アクリル系重合体は、前記単量体を、溶液重合法、隗状重合法、懸濁重合法、乳化重合法等の公知の重合方法で重合することによって製造することができる。粘着剤の耐水性をより一層向上するうえで、溶液重合法や塊状重合法で製造することが好ましい。
The acrylic polymer can be produced by polymerizing the monomer by a known polymerization method such as a solution polymerization method, a cage polymerization method, a suspension polymerization method, or an emulsion polymerization method. In order to further improve the water resistance of the pressure-sensitive adhesive, it is preferably produced by a solution polymerization method or a bulk polymerization method.
前記重合の開始方法としては、重合開始剤を使用する方法が挙げられる。前記重合開始剤としては、過酸化ベンゾイルや過酸化ラウロイル等の過酸化物系の重合開始剤、アゾビスイソブチルニトリル等のアゾ系の熱重合開始剤、アセトフェノン系光重合開始剤、ベンゾインエーテル系光重合開始剤、ベンジルケタール系光重合開始剤、アシルフォスフィンオキシド系光重合開始剤、ベンゾイン系光重合開始剤、ベンゾフェノン系の光重合開始剤を使用することができる。
The polymerization initiation method includes a method using a polymerization initiator. Examples of the polymerization initiator include peroxide-based polymerization initiators such as benzoyl peroxide and lauroyl peroxide, azo-based thermal polymerization initiators such as azobisisobutylnitrile, acetophenone-based photopolymerization initiators, and benzoin ether-based light. A polymerization initiator, a benzyl ketal photopolymerization initiator, an acylphosphine oxide photopolymerization initiator, a benzoin photopolymerization initiator, or a benzophenone photopolymerization initiator can be used.
上記アクリル系重合体の分子量は、ゲルパーミエッションクロマトグラフ(GPC)で測定される標準ポリスチレン換算での重量平均分子量が、40万~300万、好ましくは80万~250万である。
The molecular weight of the acrylic polymer is 400,000 to 3 million, preferably 800,000 to 2.5 million, based on standard polystyrene as measured by gel permeation chromatography (GPC).
ここで、GPC法による分子量の測定は、東ソー株式会社製GPC装置(HLC-8329GPC)を用いて測定される、スタンダードポリスチレン換算値であり、測定条件は以下のとおりである。
Here, the molecular weight measurement by the GPC method is a standard polystyrene conversion value measured using a GPC apparatus (HLC-8329GPC) manufactured by Tosoh Corporation, and the measurement conditions are as follows.
サンプル濃度:0.5質量%(テトラヒドロフラン溶液)
サンプル注入量:100μl
溶離液:THF(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
スタンダードポリスチレン分子量: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: THF (tetrahydrofuran)
Flow rate: 1.0 ml / min Measurement temperature: 40 ° C
This column: TSKgel GMHHR-H (20) 2 Guard column: TSKgel HXL-H
Detector: differential refractometer Standard polystyrene molecular weight: 10,000 to 20 million (manufactured by Tosoh Corporation)
サンプル注入量:100μl
溶離液:THF(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
スタンダードポリスチレン分子量: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: THF (tetrahydrofuran)
Flow rate: 1.0 ml / min Measurement temperature: 40 ° C
This column: TSKgel GMHHR-H (20) 2 Guard column: TSKgel HXL-H
Detector: differential refractometer Standard polystyrene molecular weight: 10,000 to 20 million (manufactured by Tosoh Corporation)
前記粘着剤層の形成に使用する粘着剤としては、被着体との密着性や面接着強度をより一層向上することを目的として、粘着付与樹脂を使用することが好ましい。
As the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer, it is preferable to use a tackifying resin for the purpose of further improving the adhesion to the adherend and the surface adhesion strength.
前記粘着付与樹脂としては、ロジン系粘着付与樹脂、重合ロジン系粘着付与樹脂、重合ロジンエステル系粘着付与樹脂、ロジンフェノール系粘着付与樹脂、安定化ロジンエステル系粘着付与樹脂、不均化ロジンエステル系粘着付与樹脂、水添ロジンエステル系粘着付与樹脂、テルペン系粘着付与樹脂、テルペンフェノール系粘着付与樹脂、石油樹脂系粘着付与樹脂、(メタ)アクリレート系粘着付与樹脂等を使用することができる。前記粘着剤としてエマルジョン型の粘着剤を使用する場合には、エマルジョン型の粘着付与樹脂を使用することが好ましい。
Examples of the tackifying resin include a rosin-based tackifying resin, a polymerized rosin-based tackifying resin, a polymerized rosin ester-based tackifying resin, a rosin phenol-based tackifying resin, a stabilized rosin ester-based tackifying resin, and a disproportionated rosin ester-based resin. A tackifier resin, a hydrogenated rosin ester tackifier resin, a terpene tackifier resin, a terpene phenol tackifier resin, a petroleum resin tackifier resin, a (meth) acrylate tackifier resin, or the like can be used. When an emulsion type adhesive is used as the adhesive, an emulsion type tackifying resin is preferably used.
前記粘着付与樹脂としては、前記したなかでも不均化ロジンエステル系粘着付与樹脂、重合ロジンエステル系粘着付与樹脂、ロジンフェノール系粘着付与樹脂、水添ロジンエステル系粘着付与樹脂、(メタ)アクリレート系粘着付与樹脂、テルペンフェノール系粘着付与樹脂を、1種または2種類以上使用することが好ましい。
Examples of the tackifying resin include disproportionated rosin ester tackifying resin, polymerized rosin ester tackifying resin, rosin phenol tackifying resin, hydrogenated rosin ester tackifying resin, (meth) acrylate, among others. It is preferable to use one type or two or more types of tackifier resins and terpene phenol tackifier resins.
粘着付与樹脂の軟化点は、特に規定されないが30℃~180℃、好ましくは70℃~140℃である。軟化点の高い粘着付与樹脂を配合することで、高い接着性能が期待できる。(メタ)アクリレート系の粘着付与樹脂の場合は、ガラス転移温度が30℃~200℃、好ましくは50℃~160℃である。
The softening point of the tackifying resin is not particularly specified, but is 30 ° C to 180 ° C, preferably 70 ° C to 140 ° C. By blending a tackifying resin with a high softening point, high adhesive performance can be expected. In the case of a (meth) acrylate-based tackifying resin, the glass transition temperature is 30 ° C. to 200 ° C., preferably 50 ° C. to 160 ° C.
前記アクリル系重合体100質量部に対する粘着付与樹脂の使用量は、5質量部~65質量部であることが好ましく、8質量部~55質量部であることが好ましい。前記範囲の粘着付与樹脂を含有する粘着剤を使用することによって、被着体との密着性をより一層向上することができる。
The amount of the tackifying resin used relative to 100 parts by mass of the acrylic polymer is preferably 5 parts by mass to 65 parts by mass, and more preferably 8 parts by mass to 55 parts by mass. By using the pressure-sensitive adhesive containing the tackifying resin in the above range, the adhesion with the adherend can be further improved.
前記粘着剤は、粘着剤層の凝集力をより一層向上することを目的として、架橋剤と組み合わせ使用することが好ましい。
The adhesive is preferably used in combination with a crosslinking agent for the purpose of further improving the cohesive force of the adhesive layer.
前記架橋剤としては、イソシアネート系架橋剤、エポキシ系架橋剤、金属キレート系架橋剤、アジリジン系架橋剤等が挙げられる。なかでも、前記アクリル系重合体の重合終了後に添加でき、架橋反応を進行させるタイプの架橋剤を使用することが好ましく、(メタ)アクリル系重合体との反応性に富むイソシアネート系架橋剤及びエポキシ系架橋剤を使用することが好ましく、発泡体基材との密着性をより一層向上するうえでイソシアネート系架橋剤を使用することがより好ましい。
Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, a metal chelate crosslinking agent, and an aziridine crosslinking agent. Among these, it is preferable to use a crosslinking agent of a type that can be added after the completion of the polymerization of the acrylic polymer and promotes a crosslinking reaction. An isocyanate crosslinking agent and an epoxy that are highly reactive with (meth) acrylic polymers. It is preferable to use a cross-linking agent, and it is more preferable to use an isocyanate-based cross-linking agent in order to further improve the adhesion to the foam substrate.
イソシアネート系架橋剤としては、トリレンジイソシアネート、ナフチレン-1,5-ジイソシアネート、ヘキサメチレンジイソシアネート、ジフェニルメタンジイソシアネート、キシリレンジイソシアネート、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等が挙げられる。特に好ましいのは、3官能のポリイソシアネート系化合物である。3官能のイソシアネート系化合物としては、トリレンジイソシアネート及びこれらのトリメチロールプロパン付加体、トリフェニルメタンイソシアネート等が挙げられる。
Examples of the isocyanate-based crosslinking agent include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane-modified tolylene diisocyanate, and the like. Particularly preferred are trifunctional polyisocyanate compounds. Examples of the trifunctional isocyanate compound include tolylene diisocyanate, trimethylolpropane adducts thereof, and triphenylmethane isocyanate.
粘着剤層の架橋度合いの指標として、粘着剤層をトルエンに24時間浸漬した後の不溶分を測定するゲル分率の値が用いられる。ゲル分率は、好ましくは25質量%~70質量%である。より好ましくは30質量%~60質量%、更に好ましくは30質量%~55質量%の範囲であれば、凝集性と接着性がともに良好である。
As an index of the degree of crosslinking of the pressure-sensitive adhesive layer, a gel fraction value for measuring the insoluble content after the pressure-sensitive adhesive layer is immersed in toluene for 24 hours is used. The gel fraction is preferably 25% by mass to 70% by mass. More preferably in the range of 30% by mass to 60% by mass, and still more preferably in the range of 30% by mass to 55% by mass, both cohesion and adhesiveness are good.
なお、ゲル分率の測定は下記の方法によって行う。
The gel fraction is measured by the following method.
まず、剥離シート上に、乾燥後の厚さが50μmになるように、必要に応じて架橋剤を含有する粘着剤を塗工し、100℃で3分間乾燥し、40℃で2日エージングしたものを50mm角に切り取り、これを試料とする。
First, a pressure-sensitive adhesive containing a crosslinking agent was applied on the release sheet as needed so that the thickness after drying was 50 μm, dried at 100 ° C. for 3 minutes, and aged at 40 ° C. for 2 days. A thing is cut into a 50-mm square and this is made into a sample.
次に、上記試料の質量(G1)を測定した後、前記試料をトルエン溶液中に23℃で24時間浸漬する。前記浸漬後の試料のトルエン不溶解分を300メッシュ金網で濾過することにより分離し、110℃で1時間乾燥した後の残渣の質量(G2)を測定し、以下の式に従ってゲル分率が求められる。
Next, after measuring the mass (G1) of the sample, the sample is immersed in a toluene solution at 23 ° C. for 24 hours. The toluene-insoluble matter of the sample after the immersion is separated by filtering through a 300 mesh wire mesh, and the mass (G2) of the residue after drying at 110 ° C. for 1 hour is measured, and the gel fraction is obtained according to the following formula. It is done.
ゲル分率(質量%)=(G2/G1)×100
Gel fraction (% by mass) = (G2 / G1) × 100
前記粘着剤としては、必要に応じて、可塑剤、軟化剤、酸化防止剤、難燃剤、ガラスやプラスチック製の繊維・バルーン・ビーズ、金属粉末、金属酸化物、金属窒化物等の充填剤、顔料・染料等の着色剤、レベリング剤、増粘剤、撥水剤、消泡剤等の添加剤を使用することができる。
As the pressure-sensitive adhesive, if necessary, a plasticizer, a softener, an antioxidant, a flame retardant, a filler such as glass or plastic fibers / balloons / beads, metal powder, metal oxide, metal nitride, Additives such as colorants such as pigments and dyes, leveling agents, thickeners, water repellents, and antifoaming agents can be used.
本発明の粘着テープを構成する粘着剤層は、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度が好ましくは温度が-40℃~15℃であることが好ましい。粘着剤層の損失正接のピーク値を当該範囲とすることで、常温下での被着体との良好な密着性を付与しやすくなる。特に低温環境下での耐落下衝撃性の向上に際しては、-35℃~10℃であることがより好ましく、-30℃~6℃であることがさらに好ましい。
The temperature of the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention is preferably -40 ° C. to 15 ° C., preferably at a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz. By making the peak value of the loss tangent of the pressure-sensitive adhesive layer within the above range, it becomes easy to impart good adhesion to the adherend at room temperature. In particular, in improving the drop impact resistance in a low temperature environment, it is more preferably −35 ° C. to 10 ° C., and further preferably −30 ° C. to 6 ° C.
周波数1Hzにおける損失正接(tanδ)は、温度分散による動的粘弾性測定で得られた貯蔵弾性率(G’)、損失弾性率(G”)から、tanδ=G”/G’の式より求められる。動的粘弾性の測定においては、粘弾性試験機(ティ・エイ・インスツルメント・ジャパン社製、商品名:ARES G2)を用いて、厚さ約2mmに形成した粘着剤層を同試験機の測定部である直径8mmの平行円盤の間に試験片を挟み込み、周波数1Hzで-50℃から150℃までの貯蔵弾性率(G’)と損失弾性率(G”)を測定する。
The loss tangent (tan δ) at a frequency of 1 Hz is obtained from the equation of tan δ = G ″ / G ′ from the storage elastic modulus (G ′) and loss elastic modulus (G ″) obtained by dynamic viscoelasticity measurement by temperature dispersion. It is done. In the measurement of dynamic viscoelasticity, a pressure-sensitive adhesive layer formed to a thickness of about 2 mm was used using a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan). A test piece is sandwiched between parallel disks having a diameter of 8 mm, which is a measuring part, and a storage elastic modulus (G ′) and a loss elastic modulus (G ″) from −50 ° C. to 150 ° C. are measured at a frequency of 1 Hz.
前記粘着剤層の厚さは、被着体との密着性をより一層向上でき、かつ、より一層優れたタッチフィードバック特性を確保するうえで、10μm~100μmの範囲であることが好ましく、20μm~80μmの範囲であることがより好ましい。
The thickness of the pressure-sensitive adhesive layer is preferably in the range of 10 μm to 100 μm, more preferably in the range of 10 μm to 100 μm, in order to further improve the adhesion to the adherend and to ensure even better touch feedback characteristics. A range of 80 μm is more preferable.
本発明の粘着テープは、例えば、発泡体基材に直接、または、発泡体基材上に積層された他の層の表面に、粘着剤を塗布して乾燥させる直写法、剥離シートに粘着剤を塗布して乾燥させた後、発泡体基材や他の層表面に貼り合せる転写法が挙げられる。
The pressure-sensitive adhesive tape of the present invention is, for example, a direct copy method in which a pressure-sensitive adhesive is applied and dried directly on a foam substrate or on the surface of another layer laminated on the foam substrate, and a pressure-sensitive adhesive on a release sheet. A transfer method in which is applied and dried and then bonded to the surface of the foam base material or other layer.
前記粘着剤層を形成する際に、後述するアクリル系粘着剤を使用する場合には、好ましくは20℃~50℃、より好ましくは23℃~45℃の環境下で2~7日間の熟成工程を行うと、発泡体基材と粘着剤層との密着性や粘着物性を安定させることができる。
When an acrylic pressure-sensitive adhesive described later is used in forming the pressure-sensitive adhesive layer, the aging step is preferably 2 to 7 days in an environment of 20 ° C. to 50 ° C., more preferably 23 ° C. to 45 ° C. If it performs, the adhesiveness and adhesive physical property of a foam base material and an adhesive layer can be stabilized.
前記剥離シートとしては、特に限定されないが、ポリエチレン、ポリプロピレン、ポリエステルフィルムなどの合成樹脂フィルム、紙、不織布、布、発泡シートや金属箔、およびこれらのラミネート体などの基材の少なくとも片面に、粘着剤からの剥離性を高めるためのシリコーン系処理、長鎖アルキル系処理、フッ素系処理などの剥離処理が施されたものを使用することができる。
The release sheet is not particularly limited, but is adhered to at least one surface of a base material such as a synthetic resin film such as polyethylene, polypropylene, or polyester film, paper, nonwoven fabric, cloth, foam sheet or metal foil, and a laminate thereof. A material that has been subjected to a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment for improving the releasability from the agent can be used.
なかでも、前記剥離シートとしては、厚さ10~40μmのポリエチレンを両側にラミネートした上質紙、ポリエステルフィルムの基材の片面または両面に、シリコーン系剥離処理を施されたもの等を使用することが好ましい。
In particular, as the release sheet, high-quality paper laminated on both sides with polyethylene having a thickness of 10 to 40 μm, or one having both sides of a polyester film base material subjected to silicone-based release treatment may be used. preferable.
前記方法等で得られた本発明の粘着テープは、前記発泡体基材の少なくとも一面、好ましくは両面に前記粘着剤層を有することにより、触覚フィードバックを与える振動発生装置を備えたタッチパネル装置ときょう体との固定に使用した場合であっても、好適にタッチフィードバック特性を付与することができる。したがって、本発明の粘着テープは、液晶ディスプレイ(LCD)、有機ELディスプレイ(OELD)、プラズマディスプレイパネル(PDP)等を備えた電子機器のうち、操作性向上や大型画面化がすすむスマートフォンやタブレット型パソコン、ノート型パソコン、電子手帳、携帯電話、PHS、デジタルカメラ、音楽プレーヤー、テレビ、ゲーム機、電子ペーパー等の電子機器の製造場面で好適に使用することができる。
The pressure-sensitive adhesive tape of the present invention obtained by the above method or the like is a touch panel device provided with a vibration generating device that provides tactile feedback by having the pressure-sensitive adhesive layer on at least one surface, preferably both surfaces of the foam substrate. Even if it is a case where it uses for fixation with a body, a touch feedback characteristic can be provided suitably. Therefore, the adhesive tape of the present invention is a smartphone or tablet type that improves operability and has a large screen among electronic devices including a liquid crystal display (LCD), an organic EL display (OELD), a plasma display panel (PDP), and the like. It can be suitably used in the production scene of electronic devices such as personal computers, notebook computers, electronic notebooks, mobile phones, PHS, digital cameras, music players, televisions, game machines, and electronic paper.
また、本発明の粘着テープによってタッチパネル装置ときょう体とが固定された物品は、落下等によって衝撃が加わった場合であっても、前記粘着テープを構成する発泡体基材が前記衝撃を吸収するため、良好な耐衝撃性を備える。したがって、前記粘着テープは、対角3.5インチ以上のタッチパネル装置の固定、特に単位接着面積あたりの質量が重いタッチパネル装置の固定に、好適に使用することができる。
In addition, in the article in which the touch panel device casing is fixed by the adhesive tape of the present invention, the foam base material constituting the adhesive tape absorbs the impact even when an impact is applied by dropping or the like. Therefore, it has good impact resistance. Therefore, the adhesive tape can be suitably used for fixing a touch panel device having a diagonal size of 3.5 inches or more, particularly for fixing a touch panel device having a heavy mass per unit bonding area.
また、本発明の粘着テープは、被着体との好適な密着性と追従性とを有することから、密着隙間からの浸水や粉塵の浸入を効果的に防止でき、優れた防水および防滴、防塵機能を有する。
Further, since the adhesive tape of the present invention has suitable adhesion and followability with the adherend, it is possible to effectively prevent infiltration of water and dust from the adhesion gap, and excellent waterproof and drip-proof, Has dust-proof function.
本発明の粘着テープの実施形態としては、発泡体基材を中芯とし、発泡体基材の少なくとも一面、好ましくは両面に粘着剤層が設けられた構成を基本構成とする。発泡体基材と粘着剤層とは、直接積層されていても、他の層を介して積層されていてもよい。
An embodiment of the pressure-sensitive adhesive tape of the present invention has a basic structure in which a foam base material is a core, and a pressure-sensitive adhesive layer is provided on at least one surface, preferably both surfaces of the foam base material. The foam substrate and the pressure-sensitive adhesive layer may be directly laminated or may be laminated via another layer.
前記粘着テープは、前記発泡体基材及び粘着剤層以外に、必要に応じて他の層を有していてもよい。前記他の層としては、寸法安定性や引張強さやリワーク適性を備えた粘着テープを得る場合には、ポリエステルフィルムなどのラミネート層が挙げられる。また、前記他の層としては、遮光性または光反射性を備えた粘着テープを得る場合には印刷層、電磁波シールド特性や面方向の熱伝導性を備えた粘着テープを得る場合には、金属箔や金属メッシュ導電性の金属をメッキした不織布からなる層を有していてもよい。
The adhesive tape may have other layers as required in addition to the foam base material and the adhesive layer. As said other layer, when obtaining the adhesive tape provided with dimensional stability, tensile strength, and rework suitability, laminate layers, such as a polyester film, are mentioned. In addition, as the other layer, when obtaining a pressure-sensitive adhesive tape having a light-shielding property or a light-reflecting property, a printed layer, and when obtaining a pressure-sensitive adhesive tape having electromagnetic wave shielding characteristics or thermal conductivity in the surface direction, a metal You may have the layer which consists of a nonwoven fabric plated with foil or a metal mesh electroconductive metal.
ラミネート層としては、ポリエチレンテレフタレートなどのポリエステルフィルム、ポリエチレンフィルム、ポリプロピレンフィルム等のフィルムを使用することができる。
As the laminate layer, a film such as a polyester film such as polyethylene terephthalate, a polyethylene film, or a polypropylene film can be used.
前記ラミネート層の厚さは、特に規定されないが、発泡体基材に対する良好な追従性を確保するうえで、1μm~25μmの範囲であることが好ましく、2μm~12μmの範囲だえることがより好ましい。発泡体基材とラミネート層とを接着する場合、従来公知の粘着剤やドライラミネート用の接着剤を使用することができる。
The thickness of the laminate layer is not particularly defined, but is preferably in the range of 1 μm to 25 μm, and more preferably in the range of 2 μm to 12 μm, in order to ensure good followability to the foam substrate. . When bonding a foam base material and a laminate layer, a conventionally known pressure-sensitive adhesive or an adhesive for dry lamination can be used.
遮光層としては、顔料等の着色剤を含有するインキによって印刷された層が挙げられ、黒インキを用いて印刷された層を好ましく使用することができる。
Examples of the light shielding layer include a layer printed with an ink containing a colorant such as a pigment, and a layer printed with black ink can be preferably used.
前記反射層としては、顔料等の着色剤を含有するインキによって印刷された層が挙げられ、白色インキを用いて印刷された層を好ましく使用することができる。
Examples of the reflective layer include a layer printed with an ink containing a colorant such as a pigment, and a layer printed with white ink can be preferably used.
前記遮光層や反射層の厚さは、2μm~20μmであることが好ましく、4μm~6μmであることが、前記インキの硬化収縮に起因した粘着テープのカール発生を抑制することができるため好ましい。
The thickness of the light-shielding layer and the reflective layer is preferably 2 μm to 20 μm, and preferably 4 μm to 6 μm because curling of the adhesive tape due to the curing shrinkage of the ink can be suppressed.
(粘着剤組成物(A)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート93.8質量部、アクリル酸3.1質量部、酢酸ビニル3質量部、2-ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が160万(ポリスチレン換算)のアクリル系共重合体(1)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (A))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 93.8 parts by mass of n-butyl acrylate, 3.1 parts by mass of acrylic acid, 3 parts by mass of vinyl acetate, 2-hydroxy 0.1 part by weight of ethyl acrylate and 0.1 part by weight of 2,2′-azobisisobutyronitrile as a polymerization initiator are dissolved in a solvent consisting of 100 parts by weight of ethyl acetate and polymerized at 70 ° C. for 12 hours. Thus, a solvent solution of the acrylic copolymer (1) having a weight average molecular weight of 1,600,000 (polystyrene conversion) was obtained.
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート93.8質量部、アクリル酸3.1質量部、酢酸ビニル3質量部、2-ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が160万(ポリスチレン換算)のアクリル系共重合体(1)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (A))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 93.8 parts by mass of n-butyl acrylate, 3.1 parts by mass of acrylic acid, 3 parts by mass of vinyl acetate, 2-hydroxy 0.1 part by weight of ethyl acrylate and 0.1 part by weight of 2,2′-azobisisobutyronitrile as a polymerization initiator are dissolved in a solvent consisting of 100 parts by weight of ethyl acetate and polymerized at 70 ° C. for 12 hours. Thus, a solvent solution of the acrylic copolymer (1) having a weight average molecular weight of 1,600,000 (polystyrene conversion) was obtained.
次に、アクリル系共重合体(1)100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)9質量部と、「ハリタックPCJ」(ハリマ化成株式会社製、重合ロジンのペンタエリスリトールエステル)10質量部を添加し、酢酸エチルを加えて均一に混合し、不揮発分38質量%の粘着剤組成物(A)を得た。
Next, with respect to 100 parts by mass of the acrylic copolymer (1), 9 parts by mass of “Super Ester A100” (produced by Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “Halitak PCJ” (Harima Kasei) 10 parts by mass of pentaerythritol ester of polymerized rosin (manufactured by Co., Ltd.) was added, and ethyl acetate was added and mixed uniformly to obtain an adhesive composition (A) having a nonvolatile content of 38% by mass.
(粘着剤組成物(B)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート97.95質量部、アクリル酸2.0質量部、4-ヒドロキブチルアクリレート0.05質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が200万(ポリスチレン換算)のアクリル系共重合体(2)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (B))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 97.95 parts by mass of n-butyl acrylate, 2.0 parts by mass of acrylic acid, 0.05 mass of 4-hydroxybutyl acrylate Part, 0.1 part by mass of 2,2′-azobisisobutyronitrile as a polymerization initiator was dissolved in a solvent consisting of 100 parts by mass of ethyl acetate and polymerized at 70 ° C. for 12 hours to obtain a weight average molecular weight. A solvent solution of 2 million (polystyrene equivalent) acrylic copolymer (2) was obtained.
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート97.95質量部、アクリル酸2.0質量部、4-ヒドロキブチルアクリレート0.05質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が200万(ポリスチレン換算)のアクリル系共重合体(2)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (B))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 97.95 parts by mass of n-butyl acrylate, 2.0 parts by mass of acrylic acid, 0.05 mass of 4-hydroxybutyl acrylate Part, 0.1 part by mass of 2,2′-azobisisobutyronitrile as a polymerization initiator was dissolved in a solvent consisting of 100 parts by mass of ethyl acetate and polymerized at 70 ° C. for 12 hours to obtain a weight average molecular weight. A solvent solution of 2 million (polystyrene equivalent) acrylic copolymer (2) was obtained.
次に、アクリル系共重合体(2)100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)25質量部と、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)5質量部、FTR6100(三井化学株式会社製、スチレン系石油樹脂)20質量部を添加し、酢酸エチルを加えて均一に混合し、不揮発分40質量%の粘着剤組成物(B)を得た。
Next, 25 parts by mass of “Superester A100” (produced by Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “Pencel D135” (Arakawa Chemical Co., Ltd.) with respect to 100 parts by mass of the acrylic copolymer (2). Industrial Co., Ltd., polymer rosin pentaerythritol ester) 5 parts by mass, FTR 6100 (Mitsui Chemicals Co., Ltd., styrene petroleum resin) 20 parts by mass, ethyl acetate is added and mixed uniformly, nonvolatile content 40 mass % Pressure-sensitive adhesive composition (B) was obtained.
(粘着剤組成物(C)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート44.9質量部、2-エチルヘキシルアクリレート50質量部、酢酸ビニル3質量部、アクリル酸2質量部、4-ヒドロキシブチルアクリレート0.1質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が120万(ポリスチレン換算)のアクリル系共重合体(3)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (C))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 44.9 parts by mass of n-butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of vinyl acetate,acrylic acid 2 70 parts by mass, 0.1 part by mass of 4-hydroxybutyl acrylate and 0.1 part by mass of 2,2′-azobisisobutyronitrile as a polymerization initiator were dissolved in a solvent consisting of 100 parts by mass of ethyl acetate, Polymerization was carried out at ° C for 12 hours to obtain a solvent solution of an acrylic copolymer (3) having a weight average molecular weight of 1,200,000 (polystyrene conversion).
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート44.9質量部、2-エチルヘキシルアクリレート50質量部、酢酸ビニル3質量部、アクリル酸2質量部、4-ヒドロキシブチルアクリレート0.1質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が120万(ポリスチレン換算)のアクリル系共重合体(3)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (C))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 44.9 parts by mass of n-butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of vinyl acetate,
次に、アクリル系共重合体(3)100質量部に対し、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)10質量部を添加し、酢酸エチルを加えて均一に混合し、不揮発分45質量%の粘着剤組成物(C)を得た。
Next, 10 parts by weight of “Pencel D135” (Arakawa Chemical Industries, Ltd., polymerized rosin pentaerythritol ester) is added to 100 parts by weight of the acrylic copolymer (3), and ethyl acetate is added uniformly. By mixing, an adhesive composition (C) having a nonvolatile content of 45% by mass was obtained.
(粘着剤組成物(D)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート71.9質量部、2-エチルヘキシルアクリレート20質量部、アクリル酸5質量部、メチルアクリレート3質量部、2-ヒドロキエチルアクリレート0.1質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が120万(ポリスチレン換算)のアクリル系共重合体(4)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (D))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 71.9 parts by mass of n-butyl acrylate, 20 parts by mass of 2-ethylhexyl acrylate, 5 parts by mass of acrylic acid,methyl acrylate 3 70 parts by mass, 0.1 part by mass of 2-hydroxyethyl acrylate and 0.1 part by mass of 2,2′-azobisisobutyronitrile as a polymerization initiator were dissolved in a solvent consisting of 100 parts by mass of ethyl acetate, Polymerization was carried out at ° C for 12 hours to obtain a solvent solution of an acrylic copolymer (4) having a weight average molecular weight of 1,200,000 (polystyrene conversion).
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n-ブチルアクリレート71.9質量部、2-エチルヘキシルアクリレート20質量部、アクリル酸5質量部、メチルアクリレート3質量部、2-ヒドロキエチルアクリレート0.1質量部、重合開始剤として2、2’-アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が120万(ポリスチレン換算)のアクリル系共重合体(4)の溶剤溶液を得た。 (Preparation of pressure-sensitive adhesive composition (D))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 71.9 parts by mass of n-butyl acrylate, 20 parts by mass of 2-ethylhexyl acrylate, 5 parts by mass of acrylic acid,
次に、アクリル系共重合体(4)100質量部に対し、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)20質量部、T160(ヤスハラケミカル株式会社製、テルペンフェノール)10質量部を添加、酢酸エチルを加えて均一に混合し、不揮発分45質量%の粘着剤組成物(D)を得た。
Next, with respect to 100 parts by mass of the acrylic copolymer (4), 20 parts by mass of “Pencel D135” (manufactured by Arakawa Chemical Industries, Ltd., pentaerythritol ester of polymerized rosin), T160 (manufactured by Yashara Chemical Co., Ltd., terpene phenol) 10 parts by mass was added, and ethyl acetate was added and mixed uniformly to obtain an adhesive composition (D) having a nonvolatile content of 45% by mass.
[実施例1]
(両面粘着テープの調製)
上記粘着剤組成物(A)100質量部と、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)1.1質量部とを混合し、15分攪拌したものを、剥離処理した厚さ75μmのポリエチレンテレフタレートフィルム(PETフィルム)の剥離処理面に乾燥後の厚さが50μmとなるように塗工し、80℃で3分間乾燥することによって粘着剤層を形成した。なお、前記粘着剤層を、40℃で48時間熟成した場合のその粘着剤層のゲル分率は48質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は-17℃であった。 [Example 1]
(Preparation of double-sided adhesive tape)
100 parts by mass of the pressure-sensitive adhesive composition (A) and 1.1 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content: 45% by mass) were mixed for 15 minutes. The agitated material is coated on the release-treated surface of a 75 μm-thick polyethylene terephthalate film (PET film) that has been subjected to a release treatment so that the thickness after drying is 50 μm, and is dried at 80 ° C. for 3 minutes. A layer was formed. When the pressure-sensitive adhesive layer was aged at 40 ° C. for 48 hours, the pressure-sensitive adhesive layer had a gel fraction of 48 mass% and a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz was −17 ° C. It was.
(両面粘着テープの調製)
上記粘着剤組成物(A)100質量部と、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)1.1質量部とを混合し、15分攪拌したものを、剥離処理した厚さ75μmのポリエチレンテレフタレートフィルム(PETフィルム)の剥離処理面に乾燥後の厚さが50μmとなるように塗工し、80℃で3分間乾燥することによって粘着剤層を形成した。なお、前記粘着剤層を、40℃で48時間熟成した場合のその粘着剤層のゲル分率は48質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は-17℃であった。 [Example 1]
(Preparation of double-sided adhesive tape)
100 parts by mass of the pressure-sensitive adhesive composition (A) and 1.1 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content: 45% by mass) were mixed for 15 minutes. The agitated material is coated on the release-treated surface of a 75 μm-thick polyethylene terephthalate film (PET film) that has been subjected to a release treatment so that the thickness after drying is 50 μm, and is dried at 80 ° C. for 3 minutes. A layer was formed. When the pressure-sensitive adhesive layer was aged at 40 ° C. for 48 hours, the pressure-sensitive adhesive layer had a gel fraction of 48 mass% and a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz was −17 ° C. It was.
次に、黒色ポリオレフィン系発泡体(1)(厚さ500μm、見かけ密度0.10g/cm3、25%圧縮強度:39kPa、流れ方向の引張強さ:219N/cm2、幅方向の引張強さ:178N/cm2である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数60mN/mとしたもの)からなる基材の両面に、前記熟成前の粘着剤層を1枚ずつ貼り合わせたのち、23℃下線圧5kg/cmのロールでラミネートした。その後、40℃で48時間熟成し、厚さ600μmの両面粘着テープを得た。
Next, black polyolefin-based foam (1) (thickness 500 μm, apparent density 0.10 g / cm 3 , 25% compressive strength: 39 kPa, flow direction tensile strength: 219 N / cm 2 , width direction tensile strength The surface of the foam made by Sekisui Chemical Co., Ltd., which is 178 N / cm 2, with a wetting index of 60 mN / m by corona treatment), one adhesive layer before aging on each side of the substrate After bonding, the laminate was laminated with a roll having an underline pressure of 5 kg / cm at 23 ° C. Thereafter, aging was performed at 40 ° C. for 48 hours to obtain a double-sided pressure-sensitive adhesive tape having a thickness of 600 μm.
なお、前記発泡体の厚さは、尾崎製作所製ダイヤルシクネスゲージG型を用いて測定した。前記両面粘着テープの厚さは、離型フィルムを除去した状態で尾崎製作所製ダイヤルシクネスゲージG型を用いて測定した。また、前記発泡体の引張強さは、前記発泡体を標線間隔2cm(発泡体基材の流れ方向、幅方向)、幅1cmの大きさに裁断して得た試験片を、引張速度300mm/分で引っ張り、切断した際の強度を測定した。実施例2以降で使用した発泡体の厚さ及び引張強さ、ならびに、両面粘着テープの厚さも上記と同様の方法で測定した。
In addition, the thickness of the foam was measured using a dial series gauge G type manufactured by Ozaki Seisakusho. The thickness of the double-sided pressure-sensitive adhesive tape was measured using a dial series gauge G type manufactured by Ozaki Seisakusho with the release film removed. In addition, the tensile strength of the foam was determined by cutting a test piece obtained by cutting the foam into a size of 2 cm between the marked lines (flow direction and width direction of the foam base material) and 1 cm in width. The strength at the time of cutting by cutting at / min was measured. The thickness and tensile strength of the foam used in Example 2 and later, and the thickness of the double-sided adhesive tape were also measured by the same method as described above.
[実施例2]
粘着剤組成物(A)の代わりに粘着剤組成物(B)を使用し、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)の使用量を1.1質量部から1.33質量部に変更すること以外は、実施例1と同一の方法で、厚さ600μmの両面粘着テープを得た。なお、40℃で48時間熟成した後の粘着剤層のゲル分率は37質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は2℃であった。 [Example 2]
The pressure-sensitive adhesive composition (B) was used in place of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used. A double-sided pressure-sensitive adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.33 parts by mass. The gel fraction of the pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours was 37% by mass, and the temperature showing the peak value of loss tangent (tan δ) at a frequency of 1 Hz was 2 ° C.
粘着剤組成物(A)の代わりに粘着剤組成物(B)を使用し、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)の使用量を1.1質量部から1.33質量部に変更すること以外は、実施例1と同一の方法で、厚さ600μmの両面粘着テープを得た。なお、40℃で48時間熟成した後の粘着剤層のゲル分率は37質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は2℃であった。 [Example 2]
The pressure-sensitive adhesive composition (B) was used in place of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used. A double-sided pressure-sensitive adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.33 parts by mass. The gel fraction of the pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours was 37% by mass, and the temperature showing the peak value of loss tangent (tan δ) at a frequency of 1 Hz was 2 ° C.
[実施例3]
粘着剤組成物(A)の代わりに粘着剤組成物(C)を使用し、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)の使用量を1.1質量部から1.0質量部に変更したこと以外は、実施例1と同一の方法で、厚さ600μmの両面粘着テープを得た。なお、40℃で48時間熟成した後の粘着剤層のゲル分率は42質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は-28℃であった。 [Example 3]
The pressure-sensitive adhesive composition (C) was used in place of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used. A double-sided adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.0 part by mass. The pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours had a gel fraction of 42% by mass and a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz was −28 ° C.
粘着剤組成物(A)の代わりに粘着剤組成物(C)を使用し、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)の使用量を1.1質量部から1.0質量部に変更したこと以外は、実施例1と同一の方法で、厚さ600μmの両面粘着テープを得た。なお、40℃で48時間熟成した後の粘着剤層のゲル分率は42質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は-28℃であった。 [Example 3]
The pressure-sensitive adhesive composition (C) was used in place of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used. A double-sided adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.0 part by mass. The pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours had a gel fraction of 42% by mass and a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz was −28 ° C.
[実施例4]
粘着剤組成物(A)の代わりに粘着剤組成物(D)を使用し、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)の使用量を1.1質量部から1.6質量部に変更したこと以外は、実施例1と同一の方法で、厚さ600μmの両面粘着テープを得た。なお、40℃で48時間熟成した後の粘着剤層のゲル分率は40質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は-5℃であった。 [Example 4]
The pressure-sensitive adhesive composition (D) was used instead of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used. A double-sided adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.6 parts by mass. The pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours had a gel fraction of 40% by mass and a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz was −5 ° C.
粘着剤組成物(A)の代わりに粘着剤組成物(D)を使用し、「コロネートL-45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、固形分45質量%)の使用量を1.1質量部から1.6質量部に変更したこと以外は、実施例1と同一の方法で、厚さ600μmの両面粘着テープを得た。なお、40℃で48時間熟成した後の粘着剤層のゲル分率は40質量%、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度は-5℃であった。 [Example 4]
The pressure-sensitive adhesive composition (D) was used instead of the pressure-sensitive adhesive composition (A), and the amount of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content 45% by mass) was used. A double-sided adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1 except that the amount was changed from 1.1 parts by mass to 1.6 parts by mass. The pressure-sensitive adhesive layer after aging at 40 ° C. for 48 hours had a gel fraction of 40% by mass and a temperature showing a peak value of loss tangent (tan δ) at a frequency of 1 Hz was −5 ° C.
[実施例5]
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(2)(厚さ:500μm、見かけ密度0.07g/cm3、25%圧縮強度:32kPa、流れ方向の引張強さ:160N/cm2、幅方向の引張強さ:132N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例4と同一の方法で厚さ600μmの両面粘着テープを得た。 [Example 5]
Black polyolefin foam (2) instead of black polyolefin foam (1) (thickness: 500 μm, apparent density 0.07 g / cm 3 , 25% compressive strength: 32 kPa, tensile strength in the flow direction: 160 N / cm 2, a tensile strength in the width direction: 132N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 600 μm was obtained in the same manner as in No. 4.
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(2)(厚さ:500μm、見かけ密度0.07g/cm3、25%圧縮強度:32kPa、流れ方向の引張強さ:160N/cm2、幅方向の引張強さ:132N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例4と同一の方法で厚さ600μmの両面粘着テープを得た。 [Example 5]
Black polyolefin foam (2) instead of black polyolefin foam (1) (thickness: 500 μm, apparent density 0.07 g / cm 3 , 25% compressive strength: 32 kPa, tensile strength in the flow direction: 160 N / cm 2, a tensile strength in the width direction: 132N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 600 μm was obtained in the same manner as in No. 4.
[実施例6]
黒色ポリオレフィン系発泡体(1)の代わりに白色ポリオレフィン系発泡体(1)(厚さ:600μm、見かけ密度0.10g/cm3、25%圧縮強度:52kPa、流れ方向の引張強さ:215N/cm2、幅方向の引張強さ:115N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ700μmの両面粘着テープを得た。 [Example 6]
Instead of the black polyolefin foam (1), the white polyolefin foam (1) (thickness: 600 μm, apparent density 0.10 g / cm 3 , 25% compression strength: 52 kPa, tensile strength in the flow direction: 215 N / cm 2, a tensile strength in the width direction: 115N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 700 μm was obtained in the same manner as in Example 1.
黒色ポリオレフィン系発泡体(1)の代わりに白色ポリオレフィン系発泡体(1)(厚さ:600μm、見かけ密度0.10g/cm3、25%圧縮強度:52kPa、流れ方向の引張強さ:215N/cm2、幅方向の引張強さ:115N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ700μmの両面粘着テープを得た。 [Example 6]
Instead of the black polyolefin foam (1), the white polyolefin foam (1) (thickness: 600 μm, apparent density 0.10 g / cm 3 , 25% compression strength: 52 kPa, tensile strength in the flow direction: 215 N / cm 2, a tensile strength in the width direction: 115N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 700 μm was obtained in the same manner as in Example 1.
[実施例7]
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(3)(厚さ:800μm、見かけ密度0.13g/cm3、25%圧縮強度:74kPa、流れ方向の引張強さ:262N/cm2、幅方向の引張強さ:167N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ900μmの両面粘着テープを得た。 [Example 7]
Black polyolefin foam (3) instead of black polyolefin foam (1) (thickness: 800 μm, apparent density 0.13 g / cm 3 , 25% compression strength: 74 kPa, tensile strength in the flow direction: 262 N / cm 2, a tensile strength in the width direction: 167N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 900 μm was obtained in the same manner as in Example 1.
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(3)(厚さ:800μm、見かけ密度0.13g/cm3、25%圧縮強度:74kPa、流れ方向の引張強さ:262N/cm2、幅方向の引張強さ:167N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ900μmの両面粘着テープを得た。 [Example 7]
Black polyolefin foam (3) instead of black polyolefin foam (1) (thickness: 800 μm, apparent density 0.13 g / cm 3 , 25% compression strength: 74 kPa, tensile strength in the flow direction: 262 N / cm 2, a tensile strength in the width direction: 167N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 900 μm was obtained in the same manner as in Example 1.
[実施例8]
黒色ポリオレフィン系発泡体(1)の代わりに黒色エチレン-酢酸ビニル共重合体系発泡体(1)(厚さ:1100μm、見かけ密度0.13g/cm3、25%圧縮強度:59kPa、流れ方向の引張強さ:202N/cm2、幅方向の引張強さ:145N/cm2、である東レ株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用い、乾燥後の粘着剤層の厚さを50μmから75μmに変更したこと以外は、実施例1と同一の方法で厚さ1250μmの両面粘着テープを得た。 [Example 8]
Black ethylene-vinyl acetate copolymer foam (1) instead of black polyolefin foam (1) (thickness: 1100 μm, apparent density 0.13 g / cm 3 , 25% compressive strength: 59 kPa, tensile in the flow direction strength: 202N / cm 2, tensile strength in the width direction: 145N / cm 2, a is manufactured by Toray Industries, Inc. of what the surface of the foam was wetting index 54 mN / m at corona treatment) using, after drying A double-sided pressure-sensitive adhesive tape having a thickness of 1250 μm was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer was changed from 50 μm to 75 μm.
黒色ポリオレフィン系発泡体(1)の代わりに黒色エチレン-酢酸ビニル共重合体系発泡体(1)(厚さ:1100μm、見かけ密度0.13g/cm3、25%圧縮強度:59kPa、流れ方向の引張強さ:202N/cm2、幅方向の引張強さ:145N/cm2、である東レ株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用い、乾燥後の粘着剤層の厚さを50μmから75μmに変更したこと以外は、実施例1と同一の方法で厚さ1250μmの両面粘着テープを得た。 [Example 8]
Black ethylene-vinyl acetate copolymer foam (1) instead of black polyolefin foam (1) (thickness: 1100 μm, apparent density 0.13 g / cm 3 , 25% compressive strength: 59 kPa, tensile in the flow direction strength: 202N / cm 2, tensile strength in the width direction: 145N / cm 2, a is manufactured by Toray Industries, Inc. of what the surface of the foam was wetting index 54 mN / m at corona treatment) using, after drying A double-sided pressure-sensitive adhesive tape having a thickness of 1250 μm was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer was changed from 50 μm to 75 μm.
[実施例9]
黒色ポリオレフィン系発泡体(1)の代わりに黒色エチレン-酢酸ビニル共重合体系発泡体(2)(厚さ:800μm、見かけ密度0.13g/cm3、25%圧縮強度:52kPa、流れ方向の引張強さ:223N/cm2、幅方向の引張強さ:164N/cm2、である東レ株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例8と同一の方法で厚さ950μmの両面粘着テープを得た。 [Example 9]
Black ethylene-vinyl acetate copolymer foam (2) instead of black polyolefin foam (1) (thickness: 800 μm, apparent density 0.13 g / cm 3 , 25% compressive strength: 52 kPa, tensile in the flow direction strength: 223N / cm 2, tensile strength in the width direction: 164N / cm 2, a is Toray surface of Co. foam which was wetting index 54 mN / m corona treatment) except for using the A double-sided pressure-sensitive adhesive tape having a thickness of 950 μm was obtained in the same manner as in Example 8.
黒色ポリオレフィン系発泡体(1)の代わりに黒色エチレン-酢酸ビニル共重合体系発泡体(2)(厚さ:800μm、見かけ密度0.13g/cm3、25%圧縮強度:52kPa、流れ方向の引張強さ:223N/cm2、幅方向の引張強さ:164N/cm2、である東レ株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例8と同一の方法で厚さ950μmの両面粘着テープを得た。 [Example 9]
Black ethylene-vinyl acetate copolymer foam (2) instead of black polyolefin foam (1) (thickness: 800 μm, apparent density 0.13 g / cm 3 , 25% compressive strength: 52 kPa, tensile in the flow direction strength: 223N / cm 2, tensile strength in the width direction: 164N / cm 2, a is Toray surface of Co. foam which was wetting index 54 mN / m corona treatment) except for using the A double-sided pressure-sensitive adhesive tape having a thickness of 950 μm was obtained in the same manner as in Example 8.
[実施例10]
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(4)(厚さ:400μm、見かけ密度0.12g/cm3、25%圧縮強度:43kPa、流れ方向の引張強さ:223N/cm2、幅方向の引張強さ:164N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ500μmの両面粘着テープを得た。 [Example 10]
Black polyolefin foam (4) instead of black polyolefin foam (1) (thickness: 400 μm, apparent density 0.12 g / cm 3 , 25% compression strength: 43 kPa, tensile strength in the flow direction: 223 N / cm 2, a tensile strength in the width direction: 164N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 500 μm was obtained in the same manner as in Example 1.
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(4)(厚さ:400μm、見かけ密度0.12g/cm3、25%圧縮強度:43kPa、流れ方向の引張強さ:223N/cm2、幅方向の引張強さ:164N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ500μmの両面粘着テープを得た。 [Example 10]
Black polyolefin foam (4) instead of black polyolefin foam (1) (thickness: 400 μm, apparent density 0.12 g / cm 3 , 25% compression strength: 43 kPa, tensile strength in the flow direction: 223 N / cm 2, a tensile strength in the width direction: 164N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 500 μm was obtained in the same manner as in Example 1.
[比較例1]
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(5)(厚さ:500μm、見かけ密度0.14g/cm3、25%圧縮強度:98kPa、流れ方向の引張強さ:414N/cm2、幅方向の引張強さ:246N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ600μmの両面粘着テープを得た。 [Comparative Example 1]
Black polyolefin foam (5) instead of black polyolefin foam (1) (thickness: 500 μm, apparent density 0.14 g / cm 3 , 25% compressive strength: 98 kPa, tensile strength in the flow direction: 414 N / cm 2, a tensile strength in the width direction: 246N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1.
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(5)(厚さ:500μm、見かけ密度0.14g/cm3、25%圧縮強度:98kPa、流れ方向の引張強さ:414N/cm2、幅方向の引張強さ:246N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ600μmの両面粘着テープを得た。 [Comparative Example 1]
Black polyolefin foam (5) instead of black polyolefin foam (1) (thickness: 500 μm, apparent density 0.14 g / cm 3 , 25% compressive strength: 98 kPa, tensile strength in the flow direction: 414 N / cm 2, a tensile strength in the width direction: 246N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided adhesive tape having a thickness of 600 μm was obtained in the same manner as in Example 1.
[比較例2]
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(6)(厚さ:600μm、見かけ密度0.13g/cm3、25%圧縮強度:86kPa、流れ方向の引張強さ:380N/cm2、幅方向の引張強さ:220N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ700μmの両面粘着テープを得た。 [Comparative Example 2]
Black polyolefin foam (6) instead of black polyolefin foam (1) (thickness: 600 μm, apparent density 0.13 g / cm 3 , 25% compressive strength: 86 kPa, tensile strength in the flow direction: 380 N / cm 2, a tensile strength in the width direction: 220 N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 700 μm was obtained in the same manner as in Example 1.
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(6)(厚さ:600μm、見かけ密度0.13g/cm3、25%圧縮強度:86kPa、流れ方向の引張強さ:380N/cm2、幅方向の引張強さ:220N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同一の方法で厚さ700μmの両面粘着テープを得た。 [Comparative Example 2]
Black polyolefin foam (6) instead of black polyolefin foam (1) (thickness: 600 μm, apparent density 0.13 g / cm 3 , 25% compressive strength: 86 kPa, tensile strength in the flow direction: 380 N / cm 2, a tensile strength in the width direction: 220 N / cm 2, of Sekisui Chemical Co., Ltd. is one surface of the foam was wetting index 54 mN / m corona treatment) except for the use of the embodiment A double-sided pressure-sensitive adhesive tape having a thickness of 700 μm was obtained in the same manner as in Example 1.
[比較例3]
粘着剤層の乾燥後の厚さを50μmから75μmに変更したこと以外は、比較例2と同一の方法で厚さ750μmの両面粘着テープを得た。 [Comparative Example 3]
A double-sided pressure-sensitive adhesive tape having a thickness of 750 μm was obtained in the same manner as in Comparative Example 2, except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 50 μm to 75 μm.
粘着剤層の乾燥後の厚さを50μmから75μmに変更したこと以外は、比較例2と同一の方法で厚さ750μmの両面粘着テープを得た。 [Comparative Example 3]
A double-sided pressure-sensitive adhesive tape having a thickness of 750 μm was obtained in the same manner as in Comparative Example 2, except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 50 μm to 75 μm.
上記実施例及び比較例にて使用した発泡体基材、上記実施例及び比較例で得られた両面粘着テープについて、以下の評価を行った。得られた結果を下表に示す。
The foam substrate used in the above Examples and Comparative Examples and the double-sided pressure-sensitive adhesive tapes obtained in the above Examples and Comparative Examples were evaluated as follows. The results obtained are shown in the table below.
[発泡体基材と粘着テープ厚さ]
発泡体基材の厚さは、尾崎製作所製のダイヤルシクネスゲージG型を用いて測定した。粘着テープの厚さは、剥離フィルムを剥がしたものの厚さを、ダイヤルシクネスゲージG型を用いて測定した。 [Foam substrate and adhesive tape thickness]
The thickness of the foam base material was measured using a dial series gauge G type manufactured by Ozaki Seisakusho. The thickness of the pressure-sensitive adhesive tape was measured by using a dial thickness gauge G type after peeling the release film.
発泡体基材の厚さは、尾崎製作所製のダイヤルシクネスゲージG型を用いて測定した。粘着テープの厚さは、剥離フィルムを剥がしたものの厚さを、ダイヤルシクネスゲージG型を用いて測定した。 [Foam substrate and adhesive tape thickness]
The thickness of the foam base material was measured using a dial series gauge G type manufactured by Ozaki Seisakusho. The thickness of the pressure-sensitive adhesive tape was measured by using a dial thickness gauge G type after peeling the release film.
[引張強さ]
標線間隔2cm(発泡体基材の流れ方向、幅方向)、幅1cmの試験片に加工した発泡体基材を、引張速度300mm/分で引っ張り、切断した際の強度を測定した。 [Tensile strength]
The foam base material processed into a test piece having a marked line interval of 2 cm (flow direction and width direction of the foam base material) and a width of 1 cm was pulled at a tensile speed of 300 mm / min, and the strength when cut was measured.
標線間隔2cm(発泡体基材の流れ方向、幅方向)、幅1cmの試験片に加工した発泡体基材を、引張速度300mm/分で引っ張り、切断した際の強度を測定した。 [Tensile strength]
The foam base material processed into a test piece having a marked line interval of 2 cm (flow direction and width direction of the foam base material) and a width of 1 cm was pulled at a tensile speed of 300 mm / min, and the strength when cut was measured.
[切断伸度]
標線間隔2cm(発泡体基材の流れ方向、幅方向)、幅1cmの試験片に加工した発泡体基材を、引張速度300mm/分で引っ張り、切断した際の伸度を測定した。 [Cutting elongation]
The foam base material processed into a test piece having a mark interval of 2 cm (flow direction and width direction of the foam base material) and a width of 1 cm was pulled at a tensile speed of 300 mm / min, and the elongation was measured.
標線間隔2cm(発泡体基材の流れ方向、幅方向)、幅1cmの試験片に加工した発泡体基材を、引張速度300mm/分で引っ張り、切断した際の伸度を測定した。 [Cutting elongation]
The foam base material processed into a test piece having a mark interval of 2 cm (flow direction and width direction of the foam base material) and a width of 1 cm was pulled at a tensile speed of 300 mm / min, and the elongation was measured.
[発泡体基材の流れ方向及び幅方向の平均気泡径]
発泡体基材を流れ方向、幅方向とも約1cmに切断し、切断した発泡体基材の切断面中央部分をマイクロスコープ(商品名「KH-7700」、HIROX社製)で200倍に拡大したのち、発泡体基材の切断面がその基材厚さ方向の全長に亘って写真に納まるように、発泡体基材の幅方向または流れ方向の断面を写真撮影した。得られた写真において、流れ方向または幅方向の拡大前の実際の長さが2mm分の切断面に存在する気泡径を全て測定し、その平均値から平均気泡径を算出した。これを、任意の10カ所で測定し、その平均値を流れ方向(MD)及び幅方向(CD)の平均気泡径とした。 [Average cell diameter in the flow direction and width direction of the foam substrate]
The foam base material was cut to about 1 cm in both the flow direction and the width direction, and the center part of the cut surface of the foam base material was enlarged 200 times with a microscope (trade name “KH-7700”, manufactured by HIROX). Then, the cross section of the width direction of a foam base material or the flow direction was photographed so that the cut surface of a foam base material might fit in a photograph over the full length of the base material thickness direction. In the obtained photograph, all the bubble diameters existing on the cut surface having an actual length of 2 mm before expansion in the flow direction or the width direction were measured, and the average bubble diameter was calculated from the average value. This was measured at 10 arbitrary points, and the average value was taken as the average cell diameter in the flow direction (MD) and the width direction (CD).
発泡体基材を流れ方向、幅方向とも約1cmに切断し、切断した発泡体基材の切断面中央部分をマイクロスコープ(商品名「KH-7700」、HIROX社製)で200倍に拡大したのち、発泡体基材の切断面がその基材厚さ方向の全長に亘って写真に納まるように、発泡体基材の幅方向または流れ方向の断面を写真撮影した。得られた写真において、流れ方向または幅方向の拡大前の実際の長さが2mm分の切断面に存在する気泡径を全て測定し、その平均値から平均気泡径を算出した。これを、任意の10カ所で測定し、その平均値を流れ方向(MD)及び幅方向(CD)の平均気泡径とした。 [Average cell diameter in the flow direction and width direction of the foam substrate]
The foam base material was cut to about 1 cm in both the flow direction and the width direction, and the center part of the cut surface of the foam base material was enlarged 200 times with a microscope (trade name “KH-7700”, manufactured by HIROX). Then, the cross section of the width direction of a foam base material or the flow direction was photographed so that the cut surface of a foam base material might fit in a photograph over the full length of the base material thickness direction. In the obtained photograph, all the bubble diameters existing on the cut surface having an actual length of 2 mm before expansion in the flow direction or the width direction were measured, and the average bubble diameter was calculated from the average value. This was measured at 10 arbitrary points, and the average value was taken as the average cell diameter in the flow direction (MD) and the width direction (CD).
[圧縮変位量]
1)23℃で、厚さ9mmで10cm角の平滑なアルミ板に、2cm角の粘着テープを貼付して、剥離シートを除去した状態で23℃24時間放置して試験片とした。 [Compression displacement]
1) A 2 cm square adhesive tape was affixed to a smooth aluminum plate having a thickness of 9 mm and a 10 cm square at 23 ° C., and the test piece was left at 23 ° C. for 24 hours with the release sheet removed.
1)23℃で、厚さ9mmで10cm角の平滑なアルミ板に、2cm角の粘着テープを貼付して、剥離シートを除去した状態で23℃24時間放置して試験片とした。 [Compression displacement]
1) A 2 cm square adhesive tape was affixed to a smooth aluminum plate having a thickness of 9 mm and a 10 cm square at 23 ° C., and the test piece was left at 23 ° C. for 24 hours with the release sheet removed.
2)次に、直径7mmのステンレス製プローブを取り付けた引張試験機で、粘着テープを「0.5mm/分」の速度で押し、5N/cm2で圧縮した際の変位量を測定した。
2) Next, the amount of displacement when the adhesive tape was pressed at a speed of “0.5 mm / min” and compressed at 5 N / cm 2 was measured with a tensile tester equipped with a stainless steel probe having a diameter of 7 mm.
[粘着テープのtanδのピーク値]
粘弾性試験機(ティ・エイ・インスツルメント・ジャパン社製、商品名:ARES G2)を用いて、直径8mmの円に加工した粘着テープ1枚を同試験機の測定部である直径8mmの平行円盤の間に挟み込み、周波数1Hz、昇温速度2℃/分で-50℃から150℃までの損失正接(tanδ=損失弾性率(G”)/貯蔵弾性率(G’))を測定して極大値を求める。なお、ピークが2つ以上存在する場合は、値が大きい方を採用した。 [Peak value of tan δ of adhesive tape]
Using a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan Co., Ltd.), one piece of adhesive tape processed into a circle with a diameter of 8 mm has a diameter of 8 mm, which is a measuring part of the testing machine. It is sandwiched between parallel disks, and the loss tangent (tan δ = loss elastic modulus (G ″) / storage elastic modulus (G ′)) is measured from −50 ° C. to 150 ° C. at a frequency of 1 Hz and a heating rate of 2 ° C./min. If there are two or more peaks, the one with the larger value was adopted.
粘弾性試験機(ティ・エイ・インスツルメント・ジャパン社製、商品名:ARES G2)を用いて、直径8mmの円に加工した粘着テープ1枚を同試験機の測定部である直径8mmの平行円盤の間に挟み込み、周波数1Hz、昇温速度2℃/分で-50℃から150℃までの損失正接(tanδ=損失弾性率(G”)/貯蔵弾性率(G’))を測定して極大値を求める。なお、ピークが2つ以上存在する場合は、値が大きい方を採用した。 [Peak value of tan δ of adhesive tape]
Using a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan Co., Ltd.), one piece of adhesive tape processed into a circle with a diameter of 8 mm has a diameter of 8 mm, which is a measuring part of the testing machine. It is sandwiched between parallel disks, and the loss tangent (tan δ = loss elastic modulus (G ″) / storage elastic modulus (G ′)) is measured from −50 ° C. to 150 ° C. at a frequency of 1 Hz and a heating rate of 2 ° C./min. If there are two or more peaks, the one with the larger value was adopted.
[タッチフィードバック特性]
1)上記で得た両面粘着テープを用いて、外形64mm×43mm、幅2mmの額縁状サンプルを作成し、厚さ2mm、外形65mm×45mmのアクリル板1に貼付した。 [Touch feedback characteristics]
1) Using the double-sided pressure-sensitive adhesive tape obtained above, a frame-shaped sample having an outer shape of 64 mm × 43 mm and a width of 2 mm was prepared and attached to theacrylic plate 1 having a thickness of 2 mm and an outer shape of 65 mm × 45 mm.
1)上記で得た両面粘着テープを用いて、外形64mm×43mm、幅2mmの額縁状サンプルを作成し、厚さ2mm、外形65mm×45mmのアクリル板1に貼付した。 [Touch feedback characteristics]
1) Using the double-sided pressure-sensitive adhesive tape obtained above, a frame-shaped sample having an outer shape of 64 mm × 43 mm and a width of 2 mm was prepared and attached to the
2)次に、厚さ2mm、外形100mm×50mmのアクリル板2の中央に、両面粘着テープつきアクリル板の両面粘着テープ側をのせた後、端部から2kgローラーで1往復加圧し、23℃で24時間静置して試験片とした。
2) Next, after placing the double-sided adhesive tape side of the acrylic plate with the double-sided adhesive tape on the center of the acrylic plate 2 having a thickness of 2 mm and an outer shape of 100 mm × 50 mm, the pressure was reciprocated once by a 2 kg roller from the end, 23 ° C And left to stand as a test piece for 24 hours.
3)一方、ポリエステルフィルム中芯の両面粘着テープ(フィルム:厚さ25μm、透明、粘着剤層:乾燥後の厚さが88μmとした以外は実施例1と同じにして作成)を用いた事以外は、操作1)、2)と同様にして比較用の試験片を作成した。
3) On the other hand, except that a double-sided adhesive tape in the middle of the polyester film (film: thickness 25 μm, transparent, adhesive layer: prepared in the same manner as in Example 1 except that the thickness after drying was 88 μm) was used. Test pieces for comparison were prepared in the same manner as in operations 1) and 2).
4)アクリル板1の上面の短辺側の端部に圧電素子を接着したのち、アクリル板1を上にした状態で、試験片のアクリル板2の長辺部分を被験者の片手で把持する。把持した状態で圧電素子に通電して試験片を振動させた際の、アクリル板2の振動状態を評価した。
4) After the piezoelectric element is bonded to the short side end of the upper surface of the acrylic plate 1, the long side portion of the acrylic plate 2 of the test piece is held with one hand of the subject with the acrylic plate 1 facing up. The vibration state of the acrylic plate 2 was evaluated when the piezoelectric element was energized in the gripped state to vibrate the test piece.
5)3)で作成した比較用の試験片を振動させた際の状態と比較して、減衰効果を下記基準にて評価した。
5) The damping effect was evaluated according to the following criteria in comparison with the state when the test specimen for comparison prepared in 3) was vibrated.
◎大幅に減衰した
○:減衰した。 ◎ Attenuated significantly ○: Attenuated.
○:減衰した。 ◎ Attenuated significantly ○: Attenuated.
×:ほとんど減衰なし。
X: Almost no attenuation.
6)被験者5人により当該評価を実施し、最も多い評価結果を各試験片の評価結果とした。
6) The evaluation was carried out by five subjects, and the most frequent evaluation result was taken as the evaluation result of each test piece.
[面接着強度]
1)23℃で、厚さ2mmで、50mm角のアクリル板(三菱レイヨン(株)アクリライトMR200「商標名」、色相:透明)に、上記で得た両面粘着テープを幅5mm、長さ40mmとした両面粘着テープ2枚を40mm間隔で平行に貼付した(図1)。 [Surface bond strength]
1) The double-sided adhesive tape obtained above was 5 mm wide and 40 mm long on an acrylic plate (Mitsubishi Rayon Co., Ltd. Acrylite MR200 “trade name”, hue: transparent) having a thickness of 2 mm at 23 ° C. Two double-sided adhesive tapes were attached in parallel at intervals of 40 mm (FIG. 1).
1)23℃で、厚さ2mmで、50mm角のアクリル板(三菱レイヨン(株)アクリライトMR200「商標名」、色相:透明)に、上記で得た両面粘着テープを幅5mm、長さ40mmとした両面粘着テープ2枚を40mm間隔で平行に貼付した(図1)。 [Surface bond strength]
1) The double-sided adhesive tape obtained above was 5 mm wide and 40 mm long on an acrylic plate (Mitsubishi Rayon Co., Ltd. Acrylite MR200 “trade name”, hue: transparent) having a thickness of 2 mm at 23 ° C. Two double-sided adhesive tapes were attached in parallel at intervals of 40 mm (FIG. 1).
2)次に、中心部に直径10mmの穴がある、厚さ2mm、100×150mmの長方形のABS板(住友ベークライト(株)製タフエースR EAR003、色相:ナチュラル、シボなし)に、1)で作成した両面粘着テープつきアクリル板を、アクリル板の中心とABS板の中心が一致する様に貼付して、2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とした(図2)。
2) Next, a rectangular ABS plate (Tumace R EAR003, manufactured by Sumitomo Bakelite Co., Ltd., hue: natural, wrinkle-free) with a 2 mm thick, 100 × 150 mm thick hole with a 10 mm diameter hole in the center is 1) The prepared acrylic plate with double-sided adhesive tape was attached so that the center of the acrylic plate and the center of the ABS plate were coincident, pressed once with a 2 kg roller, and then allowed to stand at 23 ° C. for 1 hour. (FIG. 2).
3)試験片のABS側からABS板の穴を通して、直径8mmのステンレス製プローブを取り付けた引張試験機でアクリル板を10mm/分で押し、アクリル板が剥がれる強度を測定した(図3)。
3) Through the hole of the ABS plate from the ABS side of the test piece, the acrylic plate was pushed at 10 mm / min with a tensile tester equipped with a stainless steel probe having a diameter of 8 mm, and the strength at which the acrylic plate was peeled was measured (FIG. 3).
[耐衝撃性試験]
1)厚さ2mm、外形50mm×50mmのアクリル板(三菱レイヨン(株)アクリライトL「商標名」、色相:透明)に、長さ40mm、幅5mmの2枚の両面粘着テープの弱粘着面を40mmの間隔をあけて平行に貼付(図1)したのち、厚さ2mm、外形150mm×100mmのABS板(住友ベークライト社製、タフエースR「商標名」色相:ナチュラル、シボなし、以下同じ)の中央部に貼付した(図2)。2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とした。 [Impact resistance test]
1) Weak adhesive surface of two double-sided adhesive tapes 40mm long and 5mm wide on an acrylic plate (Mitsubishi Rayon Co., Ltd. Acrylite L "trade name", hue: transparent) with a thickness of 2mm and an external dimension of 50mm x 50mm Are attached in parallel with an interval of 40 mm (Fig. 1), and then an ABS plate having a thickness of 2 mm and an outer shape of 150 mm x 100 mm (manufactured by Sumitomo Bakelite Co., Ltd., Tuface R "trade name" hue: natural, no grain, the same applies hereinafter) It stuck on the center part of (FIG. 2). After reciprocating pressure with a 2 kg roller, the test piece was left at 23 ° C. for 1 hour.
1)厚さ2mm、外形50mm×50mmのアクリル板(三菱レイヨン(株)アクリライトL「商標名」、色相:透明)に、長さ40mm、幅5mmの2枚の両面粘着テープの弱粘着面を40mmの間隔をあけて平行に貼付(図1)したのち、厚さ2mm、外形150mm×100mmのABS板(住友ベークライト社製、タフエースR「商標名」色相:ナチュラル、シボなし、以下同じ)の中央部に貼付した(図2)。2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とした。 [Impact resistance test]
1) Weak adhesive surface of two double-sided adhesive tapes 40mm long and 5mm wide on an acrylic plate (Mitsubishi Rayon Co., Ltd. Acrylite L "trade name", hue: transparent) with a thickness of 2mm and an external dimension of 50mm x 50mm Are attached in parallel with an interval of 40 mm (Fig. 1), and then an ABS plate having a thickness of 2 mm and an outer shape of 150 mm x 100 mm (manufactured by Sumitomo Bakelite Co., Ltd., Tuface R "trade name" hue: natural, no grain, the same applies hereinafter) It stuck on the center part of (FIG. 2). After reciprocating pressure with a 2 kg roller, the test piece was left at 23 ° C. for 1 hour.
2)デュポン式衝撃試験機(テスター産業株式会社製)の台座の上に、長さ150mm、幅100mm、高さ45mmのコの字型測定台(厚さ5mmのアルミ製)を設置し、その上に試験片を、アクリル板を下向きにして載せた(図3)。ABS板側から直径15mm、質量300g、打撃を与える側の先端端部が曲率3/16インチのステンレス製の撃芯を、高さを10cmからABS板側の中心部分に10秒間隔で5回落下させ、試験片にテープの剥がれや破壊の有無を評価した。テープに剥がれや破壊がない場合は、落下する高さを10cm間隔で上げて5回連続落下を繰り返し、テープの剥がれや破壊が認められた時の高さを測定した。
2) A U-shaped measuring table (made of aluminum with a thickness of 5 mm) having a length of 150 mm, a width of 100 mm and a height of 45 mm is installed on the base of the DuPont impact tester (manufactured by Tester Sangyo Co., Ltd.). The test piece was placed on top with the acrylic plate facing down (FIG. 3). A stainless steel striker with a diameter of 15 mm, a mass of 300 g, and a striking end with a curvature of 3/16 inch is dropped from the height of 10 cm from the ABS plate side to the center part of the ABS plate side at intervals of 10 seconds 5 times. The test piece was evaluated for tape peeling and breakage. When the tape was not peeled off or broken, the falling height was increased at 10 cm intervals, and continuous dropping was repeated 5 times, and the height when peeling or breaking of the tape was observed was measured.
◎:高さ80cm試験後もテープの剥がれおよび破壊なし
○:高さ50~70cm試験後にテープの剥がれまたは破壊が生じた
×:高さ40cm以下の試験後にテープの剥がれ又は破壊が生じた A: No peeling or breakage of the tape even after the test with a height of 80 cm ○: Peeling or breakage of the tape occurred after a test with a height of 50 to 70 cm x: Peeling or breakage of the tape occurred after a test with a height of 40 cm or less
○:高さ50~70cm試験後にテープの剥がれまたは破壊が生じた
×:高さ40cm以下の試験後にテープの剥がれ又は破壊が生じた A: No peeling or breakage of the tape even after the test with a height of 80 cm ○: Peeling or breakage of the tape occurred after a test with a height of 50 to 70 cm x: Peeling or breakage of the tape occurred after a test with a height of 40 cm or less
[防水性試験]
1)上記で得た両面粘着テープを用いて、外形64mm×43mm、幅2mmの額縁状サンプルを作成し、厚さ2mm、外形65mm×45mmのアクリル板1に貼付した。 [Waterproof test]
1) Using the double-sided pressure-sensitive adhesive tape obtained above, a frame-shaped sample having an outer shape of 64 mm × 43 mm and a width of 2 mm was prepared and attached to theacrylic plate 1 having a thickness of 2 mm and an outer shape of 65 mm × 45 mm.
1)上記で得た両面粘着テープを用いて、外形64mm×43mm、幅2mmの額縁状サンプルを作成し、厚さ2mm、外形65mm×45mmのアクリル板1に貼付した。 [Waterproof test]
1) Using the double-sided pressure-sensitive adhesive tape obtained above, a frame-shaped sample having an outer shape of 64 mm × 43 mm and a width of 2 mm was prepared and attached to the
2)次に、もう一枚の厚さ2mm、外形65mm×45mmのアクリル板2の中央に、両面粘着テープつきアクリル板の両面粘着テープ側をのせた後、端部から2kgローラーで1往復加圧、23℃で24時間静置して試験片とした。
2) Next, after placing the double-sided adhesive tape side of the acrylic plate with double-sided adhesive tape on the center of another acrylic plate 2 with a thickness of 2 mm and external dimensions of 65 mm x 45 mm, add 1 reciprocation with a 2 kg roller from the end. The test piece was left standing at 23 ° C. under pressure for 24 hours.
3)試験片を水深1mに30分静置(JISC0920のIPX7準拠)した後に、額縁状両面粘着テープの額縁内への浸水の有無を評価した。
3) After leaving the test piece at a depth of 1 m for 30 minutes (compliant with IPX7 of JISC0920), the presence or absence of water immersion in the frame of the frame-shaped double-sided adhesive tape was evaluated.
○:浸水なし
×:浸水あり ○: No flooding ×: Flooding
×:浸水あり ○: No flooding ×: Flooding
上記実施例1~10のとおり、本発明の粘着テープは、触覚フィードバック機能を有するタッチパネル装置の固定に使用した場合に、好適な触覚フィードバック機能を実現できる。また、優れた落下衝撃耐性や追従性を有するものであった。一方、比較例1~3の粘着テープは、振動特性や充分な耐性が無いものであった。
As in Examples 1 to 10, the adhesive tape of the present invention can realize a suitable tactile feedback function when used for fixing a touch panel device having a tactile feedback function. Moreover, it had excellent drop impact resistance and followability. On the other hand, the adhesive tapes of Comparative Examples 1 to 3 did not have vibration characteristics or sufficient resistance.
1 粘着テープ
2 アクリル板
3 ABS板
4 コの字型測定台
5 撃芯 DESCRIPTION OFSYMBOLS 1 Adhesive tape 2 Acrylic board 3 ABS board 4 U-shaped measuring stand 5 Strike core
2 アクリル板
3 ABS板
4 コの字型測定台
5 撃芯 DESCRIPTION OF
Claims (10)
- 発泡体基材層と粘着剤層とを有する粘着テープであって、
物体の接触を感知して、触覚フィードバックを与えるタッチフィードバック機能を有するタッチパネル装置の固定に用いられ、厚さ方向に圧縮荷重5N/cm2で圧縮した際の変位量が130μm以上であることを特徴とする粘着テープ。 An adhesive tape having a foam substrate layer and an adhesive layer,
Used for fixing a touch panel device having a touch feedback function that senses contact of an object and gives tactile feedback, and has a displacement amount of 130 μm or more when compressed with a compressive load of 5 N / cm 2 in the thickness direction. Adhesive tape. - 厚さが350μm~2000μmである請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, having a thickness of 350 μm to 2000 μm.
- 発泡体基材層の厚さが300μm以上、見かけ密度が0.25g/cm3以下である請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the foam base material layer has a thickness of 300 µm or more and an apparent density of 0.25 g / cm 3 or less.
- 前記発泡体基材が、ポリオレフィン系発泡体基材である請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the foam substrate is a polyolefin-based foam substrate.
- 前記粘着剤層がアクリル系粘着剤を用いて形成される粘着剤層である請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer formed using an acrylic pressure-sensitive adhesive.
- 前記粘着剤層の厚さが10μm~150μmである請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive layer has a thickness of 10 袖 m to 150 袖 m.
- 前記発泡体基材の引張強さが50N/cm2~700N/cm2である請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the foam substrate has a tensile strength of 50 N / cm 2 to 700 N / cm 2 .
- 周波数1Hzにて測定される損失正接の極大値が0.53以下である請求項1に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the maximum value of loss tangent measured at a frequency of 1 Hz is 0.53 or less.
- 前記粘着剤層が、炭素原子数1~12のアルキル基を有する(メタ)アクリレート及びカルボキシル基を有するビニル単量体を含有する単量体成分を重合して得られるアクリル系重合体と、重合ロジンエステル系粘着付与樹脂とを含有するアクリル系粘着剤を用いて形成される粘着剤層である請求項1に記載の粘着テープ。 An acrylic polymer obtained by polymerizing a monomer component containing a (meth) acrylate having an alkyl group having 1 to 12 carbon atoms and a vinyl monomer having a carboxyl group; The pressure-sensitive adhesive tape according to claim 1, which is a pressure-sensitive adhesive layer formed using an acrylic pressure-sensitive adhesive containing a rosin ester-based tackifying resin.
- 前記タッチパネル装置が請求項1~9のいずれか1項に記載の粘着テープを介してきょう体に固定された電子機器。 An electronic device in which the touch panel device is fixed to the casing via the adhesive tape according to any one of claims 1 to 9.
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JP2014538554A JP5700178B2 (en) | 2013-03-25 | 2014-03-12 | Adhesive tape and electronic equipment |
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JPWO2014156642A1 (en) | 2017-02-16 |
JP5700178B2 (en) | 2015-04-15 |
TW201502230A (en) | 2015-01-16 |
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