WO2013047764A1 - Adhesive tape - Google Patents
Adhesive tape Download PDFInfo
- Publication number
- WO2013047764A1 WO2013047764A1 PCT/JP2012/075112 JP2012075112W WO2013047764A1 WO 2013047764 A1 WO2013047764 A1 WO 2013047764A1 JP 2012075112 W JP2012075112 W JP 2012075112W WO 2013047764 A1 WO2013047764 A1 WO 2013047764A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- optical film
- adhesive tape
- mass
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/1805—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
-
- 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
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
Definitions
- This invention relates to the adhesive tape which fixes the optical film used for image display apparatuses, such as a liquid crystal display and an organic EL (Electro Luminescence) display.
- image display apparatuses such as a liquid crystal display and an organic EL (Electro Luminescence) display.
- Image display devices such as liquid crystal displays are used in a wide range of fields including word processors and personal computers, and in particular, electronic notebooks, mobile phones, PHS, smartphones, game machines, electronic books, and the like have become increasingly smaller. It has come to be used as a display device for electronic equipment.
- image display devices in an image display module such as an LCD module, a configuration in which a backlight module and a display panel such as an LCD panel provided on the surface are fixed with an adhesive tape is widely used.
- An optical film such as a prism sheet is often provided on the surface layer fixed to the display panel.
- a reflector, a light guide plate, a diffusion sheet, etc. are generally laminated, an optical film such as a prism sheet is provided on the surface layer, and a lamp reflector is provided on the side of the light guide plate.
- a backlight module in which a light source such as an LED (Light Emitting Diode) or a cold cathode tube is disposed, and an LCD panel are stacked.
- a double-sided adhesive tape (usually punched into a frame shape, and its width is usually about 0.5 mm to about 10 mm) is sandwiched between the LCD panel and the backlight module.
- the double-sided adhesive tape may be in contact with only the prism sheet on the surface of the backlight module, or it may be in contact with the prism sheet on the surface of the backlight module and the casing containing the backlight module. It also has a role of fixing a diffusion sheet or the like installed on the lower side of the sheet and a role of preventing the entry of dust and a cushioning property to prevent the above-described parts from cracking due to an impact.
- the adhesive tape is strongly required to have both light shielding properties and light reflection properties in order to block light leaked from the light source and effectively use light.
- Such an adhesive tape has been studied for improving the characteristics, and an adhesive tape for an LCD module that is thin and has both light-shielding properties and light-reflecting properties is disclosed (see Patent Document 1).
- the subject of this invention is the adhesive tape which can fix a member suitably and can suppress the distortion of an optical film, even when using the water-based adhesive which reduced VOC in the adhesive tape which fixes the optical film which produces distortion easily. Is to provide.
- the pressure-sensitive adhesive tape used for fixing the optical film, the pressure-sensitive adhesive layer in contact with the optical film is a pressure-sensitive adhesive layer made of a water-dispersed acrylic pressure-sensitive adhesive composition, and the glass transition of the pressure-sensitive adhesive layer
- an adhesive tape having a temperature of ⁇ 5 ° C. or lower and a gel fraction of 25 to 45%.
- the pressure-sensitive adhesive tape of the present invention has a glass transition temperature of ⁇ 5 ° C. or lower and a gel fraction of 25 to 45 as a pressure-sensitive adhesive layer to be attached to an optical film while using a water-based pressure-sensitive adhesive layer with reduced VOC. % Of the pressure-sensitive adhesive layer can be used to fix the parts satisfactorily, have good repulsion resistance, and suitably suppress the distortion of the optical film.
- the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape used for fixing an optical film
- the pressure-sensitive adhesive layer in contact with the optical film is a pressure-sensitive adhesive layer made of a water-dispersed acrylic pressure-sensitive adhesive composition
- the glass of the pressure-sensitive adhesive layer The transition temperature is ⁇ 5 ° C. or lower, and the gel fraction is 25 to 45%.
- the pressure-sensitive adhesive layer attached to the optical film is a pressure-sensitive adhesive layer formed from a water-dispersed acrylic pressure-sensitive adhesive composition in which acrylic copolymer emulsion particles are dispersed in an aqueous medium.
- the pressure-sensitive adhesive layer has a glass transition temperature (Tg) of ⁇ 5 ° C. or lower, preferably ⁇ 10 ° C. or lower, more preferably ⁇ 15 ° C. or lower. To do. Thereby, even when distortion arises in an optical film, distortion can be controlled, following the distortion suitably. Further, when the pressure sensitive adhesive is sufficiently wetted with the adherend, adhesion between the adherend and the pressure sensitive adhesive is ensured, and suitable rebound resistance can be realized.
- Tg glass transition temperature
- the glass transition temperature of the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention is the peak temperature of the loss tangent (tan ⁇ ) of the dynamic viscoelastic spectrum.
- the measurement of dynamic viscoelasticity is performed by, for example, using a viscoelasticity tester (Rheometrics, trade name: Ares 2KFRTN1), inserting a test piece between parallel disks as measurement units of the tester, and a frequency of 1 Hz. Then, the storage elastic modulus (G ′) and loss elastic modulus (G ′′) from ⁇ 50 ° C. to 150 ° C. are measured at a rate of temperature rise of 2 ° C./min. Tan ⁇ is calculated from the following calculation formula.
- an adhesive having a thickness of 0.5 to 2.5 mm may be sandwiched between parallel disks alone, or a laminate of a base material and an adhesive may be stacked in layers and sandwiched between parallel disks. In the latter case, even if the base material is sandwiched in the middle, the peak temperature of the loss tangent of the dynamic viscoelastic spectrum of the adhesive is not affected.
- the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive layer having a gel fraction of 25 to 45%.
- the gel fraction of the pressure-sensitive adhesive layer is a gel fraction represented by the mass fraction ratio before and behind immersion after measuring the insoluble matter after immersing an adhesive layer in toluene for 24 hours.
- the pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer having the above glass transition temperature and gel fraction.
- the glass transition temperature of the pressure-sensitive adhesive layer is the glass transition of the acrylic copolymer used in the pressure-sensitive adhesive composition. It is appropriately adjusted depending on the temperature, the glass transition temperature of the tackifying resin, the softening point, the blending amount and the like.
- the gel fraction can be appropriately adjusted depending on the amount of the crosslinking agent and the crosslinking agent added to the pressure-sensitive adhesive composition, and the functional group monomer and the amount of the functional group monomer introduced into the acrylic copolymer that reacts with the crosslinking agent.
- the acrylic copolymer As the water-dispersed acrylic pressure-sensitive adhesive composition used for the pressure-sensitive adhesive layer, a composition in which emulsion particles of an acrylic copolymer are dispersed in an aqueous medium can be used.
- the acrylic copolymer preferably has a glass transition temperature of ⁇ 45 ° C. to ⁇ 25 ° C., more preferably ⁇ 40 ° C. to ⁇ 30 ° C., as measured by a dynamic viscoelastic spectrum.
- the glass transition temperature of the acrylic copolymer By setting the glass transition temperature of the acrylic copolymer within the range, it becomes easy to sufficiently secure the flexibility of the pressure-sensitive adhesive. Thereby, even when distortion occurs in the optical film, it becomes easy to suppress the distortion while suitably following the distortion.
- the pressure-sensitive adhesive is sufficiently wetted with the adherend, it is easy to ensure adhesion between the adherend and the pressure-sensitive adhesive, and it is easy to realize suitable repulsion resistance.
- the glass transition temperature of the acrylic copolymer constituting the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of the present invention is the peak temperature of the loss tangent (tan ⁇ ) of the dynamic viscoelastic spectrum.
- a sheet composed only of an acrylic copolymer is prepared and can be measured in the same manner as the pressure-sensitive adhesive layer.
- the (meth) acrylate monomer used for the acrylic copolymer can be used as appropriate, and in particular, the (meth) acrylate monomer having an alkyl group having 4 to 8 carbon atoms. Can be preferably used as the main monomer component.
- the (meth) acrylate monomer having 4 to 8 carbon atoms include n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and isooctyl (meth).
- (Meth) acrylates such as acrylate and n-octyl (meth) acrylate can be used.
- n-butyl acrylate and / or 2-ethylhexyl acrylate can be preferably used, and 2-ethylhexyl acrylate is particularly preferable because the glass transition temperature of the obtained pressure-sensitive adhesive layer can be easily controlled to be low. Further, the compatibility with the tackifier resin is easily improved, and the adhesion with the substrate or the adherend is easily improved.
- the content of the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms is preferably 50 to 98% by mass, and preferably 80 to 98% by mass in the monomer component used for the acrylic copolymer. Particularly preferred.
- the content of the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms in this range, it becomes easy to sufficiently secure the flexibility of the pressure-sensitive adhesive. Thereby, even when distortion occurs in the optical film, it becomes easy to suppress the distortion while suitably following the distortion.
- the pressure-sensitive adhesive is sufficiently wetted with the adherend, it is easy to ensure adhesion between the adherend and the pressure-sensitive adhesive, and it is easy to realize suitable repulsion resistance.
- 2-ethylhexyl acrylate which can be particularly preferably used is used, it is preferably 40% by mass or more, more preferably 60% by mass or more, based on the monomer component used in the acrylic copolymer. It is more preferable to set it as mass% or more, and it is still more preferable to set it as 90 mass% or more. By setting it as the said range, it becomes easy to ensure the softness
- (meth) acrylate monomers other than those described above may be used in combination as the (meth) acrylate monomer that forms the acrylic copolymer.
- examples of other (meth) acrylate monomers include (meth) acrylate monomers such as methyl (meth) acrylate and ethyl (meth) acrylate, and one or more of these may be used in combination.
- carboxyl group-containing monomer in order to increase the cohesive force within and between the acrylic copolymer emulsion particles.
- carboxyl group-containing monomer one or more selected from carboxyl group-containing vinyl monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, phthalic acid, phthalic anhydride, and crotonic acid are used. It can. Among them, acrylic acid and methacrylic acid are easy to ensure cohesive force by interaction between carboxyl groups, and there are many means for increasing cohesive force with many reactive crosslinking agents, and can express interaction with nitrogen-containing vinyl monomer described later. And the like.
- the content of the carboxyl group-containing monomer is 0.5 to 10% by mass, preferably 0.5 to 5% by mass, more preferably 1.5 to 3.5% by mass in the monomer component forming the acrylic copolymer. % Is preferred.
- a nitrogen-containing vinyl monomer as the monomer component of the acrylic copolymer.
- the nitrogen-containing vinyl monomer is presumed to produce an effect of drawing a carboxyl group that is easily oriented on the particle surface into the particle by interacting with an acid group, particularly a carboxyl group, in the acrylic copolymer emulsion particles.
- the content of the nitrogen-containing vinyl monomer is 0.1 to 4.5% by mass, preferably 0.5 to 4% by mass, more preferably 0.5 to 3.5% by mass.
- a nitrogen-containing monomer having an amide group can be preferably used. Compared with amine-based nitrogen-containing monomer groups, nitrogen-containing monomers having an amide group do not have too strong interaction with acid groups, and can suitably maintain cohesive force in emulsion particles and interaction between particles, Since cohesive force as an adhesive is easily obtained, suitable adhesiveness and reworkability are easily obtained.
- the nitrogen-containing monomer having an amide group for example, one or more selected from N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acrylonitrile, acrylamide, and N, N-dimethylacrylamide can be used.
- the ratio of the nitrogen-containing vinyl monomer and the vinyl monomer having a carboxyl group in the acrylic copolymer is not particularly limited, but the number of moles of the nitrogen-containing vinyl monomer in the monomer component constituting the acrylic copolymer.
- X and Y is the number of moles of the vinyl monomer having a carboxyl group
- the molar ratio X / Y is preferably 1/1 to 1/20, more preferably 1/1 to 1/5, 1 to 1/3 is more preferable. If it is in the said range, reaction with the vinyl monomer which has a carboxyl group, and the crosslinking agent mentioned later will advance easily.
- acrylic copolymer used in the present invention monomers other than those described above can be used as necessary.
- examples of such monomers include (meth) acrylic acid 2-hydroxyate as a hydroxyl group-containing monomer.
- Alcoholic hydroxyl group-containing monomers such as ethyl, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like can be used as appropriate.
- keto group or aldehyde group-containing monomers diacetone acrylamide, diacetone methacrylamide, acrolein, formyl styrene, vinyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, diacetone acrylate, diacetone methacrylate, acetonitrile acrylate, 2-hydroxypropyl
- examples include acrylate acetoacetate and butanediol acrylate acetate.
- 3-methacryloxypropylmethyldimethoxysilane for example, KBM-502 manufactured by Shin-Etsu Chemical Co., Ltd.
- 3-methacryloxypropyltrimethoxysilane for example, KBM-503 manufactured by Shin-Etsu Chemical Co., Ltd.
- 3 -Methacryloxypropylmethyldiethoxysilane for example, KBE-502 manufactured by Shin-Etsu Chemical Co., Ltd.
- 3-methacryloxypropyltriethoxysilane for example, KBE-503 manufactured by Shin-Etsu Chemical Co., Ltd.
- 3-acryloxypropyltri Examples include methoxysilane [for example, KBM-5103 manufactured by Shin-Etsu Chemical Co., Ltd.].
- N methylol acrylamide etc. are mentioned as a methylol group containing monomer.
- the phosphoric acid group-containing monomer include Sipomer PAM-100, PAM-200, and PAM-300 manufactured by Rhodia Nikka Co., Ltd., and 20% by mass or less in the monomer component forming the acrylic copolymer. It can be used at a ratio of 1 type or 2 types or more.
- the weight average molecular weight of the acrylic copolymer used in the present invention is preferably 500 to 1,200,000, more preferably 60 to 1,000,000. By making it within this range, the flexibility to develop sufficient wettability and adhesion to the adherend is improved, while the cohesive force that can withstand stress is improved, thereby improving the distortion of the optical film. It can be suppressed and it is easy to realize suitable repulsion resistance.
- the said weight average molecular weight is standard polystyrene conversion by a gel permeation chromatography (GPC).
- TSKgel GMHXL manufactured by Tosoh
- the column temperature is 40 ° C.
- the eluent is tetrahydrofuran
- the flow rate is 1.0 mL / min
- the standard polystyrene is TSK standard polystyrene.
- a chain transfer agent may be used for the polymerization.
- the chain transfer agent include known chain transfer agents such as lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, and 2,3-dimethylcapto-1-propanol. Can be used.
- tackifying resin In the water-dispersed acrylic pressure-sensitive adhesive composition used in the present invention, a tackifying resin should be used to develop sufficient wettability and adhesion to an adherend and to improve cohesive strength to withstand stress. Is preferred.
- the glass transition temperature of the tackifying resin is preferably 30 to 120 ° C, more preferably 40 to 100 ° C, still more preferably 45 to 80 ° C, and still more preferably 50 to 60 ° C.
- the glass transition temperature of the tackifying resin used in the pressure-sensitive adhesive constituting the pressure-sensitive adhesive tape of the present invention is the midpoint glass transition in JIS K 7121 at the stepwise change portion of the glass transition of the DSC curve measured using a DSC measuring device. It is a temperature defined as a temperature.
- a specific measurement method is, for example, a value obtained by analyzing a DSC curve measured using a DSC measurement apparatus (trade name: DSC822, manufactured by METTLER TOLEDO Co., Ltd.) using software attached to the apparatus. The sample is dried at 60 ° C. for 2 days or more under vacuum using a vacuum dryer. The range from ⁇ 50 ° C. to 200 ° C. is continuously measured twice at a temperature increase rate of 2 ° C./min, and the glass transition temperature is calculated by analyzing the second measurement data.
- an emulsion-type tackifying resin can be preferably used from the viewpoint of use in a water-dispersed pressure-sensitive adhesive composition.
- the emulsion type tackifying resin include rosin, polymerized rosin, polymerized rosin ester, rosin phenol, stabilized rosin ester, disproportionated rosin ester, terpene, terpene phenol, petroleum resin, etc. Can be illustrated.
- the polymerized rosin ester-based tackifier resins are Superester E-650 (Arakawa Chemical Industries, Ltd.), Superester E-788 (Arakawa Chemical Industries, Ltd.), Superester E-786- 60 [Arakawa Chemical Industries, Ltd.], Super Ester E-865 [Arakawa Chemical Industries, Ltd.], Super Ester E-865NT [Arakawa Chemical Industries, Ltd.], Harrier Star SK-508 [Harima Kasei ( Co., Ltd.] Harrier Star SK-508H [manufactured by Harima Kasei Co., Ltd.], Harrier Star SK-816E [manufactured by Harima Kasei Co., Ltd.], Harrier Star SK-822E [manufactured by Harima Kasei Co., Ltd.], Harrier Star SK- 3
- Crosslinking agent In the water-dispersed acrylic pressure-sensitive adhesive composition used in the present invention, it is preferable to use a crosslinking agent for the purpose of improving the cohesive strength of the resulting pressure-sensitive adhesive layer.
- the crosslinking agent include known isocyanate crosslinking agents, epoxy crosslinking agents, aziridine crosslinking agents, polyvalent metal salt crosslinking agents, metal chelate crosslinking agents, keto-hydrazide crosslinking agents, oxazoline crosslinking agents, and carbodiimide crosslinking agents.
- a crosslinking agent, a silane crosslinking agent, a glycidyl (alkoxy) epoxysilane crosslinking agent, or the like can be used.
- crosslinking agent that is added after the completion of polymerization and causes the crosslinking reaction to proceed is preferable.
- examples thereof include an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an oxazoline-based crosslinking agent, a carbodiimide-based crosslinking agent, and a glycidyl (alkoxy) epoxysilane-based crosslinking agent.
- Vernock DNW-5000 (manufactured by DIC Corporation), Vernock DNW-5010 (manufactured by DIC Corporation), Vernock DNW-5100 (manufactured by DIC Corporation), Vernock DNW- 5500 [manufactured by DIC Corporation], Aquanate 100 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 105 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 110 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 120 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 130 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 200 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 210 [manufactured by DIC Corporation), Aquanate 210 [manufacture
- Manufactured by Nippon Shokubai Co., Ltd., and carbodiimide-based cross-linking agents include Carbodilite SV-02 [Nisshinbo Co., Ltd.], Carbodilite V-02 [Nisshinbo ( )], Carbodilite V-02-L2 [Nisshinbo Co., Ltd.], Carbodilite V-04 [Nisshinbo Co., Ltd.], Carbodilite E-01 [Nisshinbo Co., Ltd.], Carbodilite E-02 [Nisshinbo Co., Ltd.] )], Carbodilite E-03A [Nisshinbo Co., Ltd.], Carbodilite E-04 [Nisshinbo Co., Ltd.], and glycidyl (alkoxy) epoxysilane crosslinking agents, 2- (3,4-epoxycyclohexylethyltrimethoxy Silane [KBM-303; manufactured by Shin-Etsu
- a crosslinking agent that reacts with a vinyl monomer having an acid group it is preferable to use a crosslinking agent that reacts with a vinyl monomer having an acid group, and the above-mentioned isocyanate crosslinking agent, epoxy compound, oxazoline compound, carbodiimide crosslinking agent, glycidyl (alkoxy) epoxysilane compound, and the like are preferable.
- a crosslinking agent that reacts with these acid groups an improvement in cohesive force can be suitably expressed.
- a base such as aqueous ammonia
- the thickness of the pressure-sensitive adhesive layer is preferably 5 to 50 ⁇ m, more preferably 10 to 30 ⁇ m. If it is 5 ⁇ m or more, sufficient adhesiveness can be obtained, and if it is 50 ⁇ m or less, it can be suitably applied to a display device and the like that are becoming lighter and thinner.
- the support used in the present invention is not particularly limited, and various supports used for fixing the image display device peripheral member can be used.
- the support body in which the colored layer was provided in the support body which consists only of a resin film, for example may be sufficient.
- a support in which a colored layer is provided on a resin film can be preferably used.
- resin film used for the support a known and commonly used resin film can be used, and examples thereof include cellophane, polyethylene, polypropylene, nylon, polystyrene, polyimide, and polyester.
- polyester is preferably used because it is excellent in strength and insulation.
- Polyethylene terephthalate can be preferably used because it has good adhesion to an ink layer using a polyurethane resin.
- the thickness of the resin film serving as a support is preferably 6 to 100 ⁇ m.
- the thickness is 6 ⁇ m or more, the film is hardly cracked at the time of peeling, and when it is 100 ⁇ m or less, peeling is hardly generated at the time of application to the adherend. More preferably, it is 12 to 50 ⁇ m.
- the resin film itself may be colored white or black, and when the resin film is a light-reflecting white resin film, the brightness of the image display can be reduced when used for the image display unit of the image display device. Since it can raise, it is preferable.
- white polyethylene terephthalate having insulating properties and light diffuse reflection properties is most preferred.
- a resin film is a black resin film which has light-shielding property.
- black polyethylene terephthalate is preferable because it can provide excellent light shielding properties.
- the colored ink used for the colored layer a colored ink used for a colored tape such as a light-shielding tape or a light reflecting tape used for fixing the peripheral member of the image display device can be appropriately used.
- the halogen content of a colored layer is 0.3 mass% or less, Preferably it is 0.05 mass% or less, and the thing which does not contain a halogen substantially is especially preferable.
- Such a colored layer with a reduced halogen content uses colored ink that does not use halogen- or sulfur-containing resins such as vinyl chloride resin as the binder resin, and therefore, anchoring of the adhesive layer is particularly obtained.
- the above-mentioned pressure-sensitive adhesive layer used in the present invention is suitable for adhesion and reworking even if it is a colored layer having a low halogen content.
- the halogen content is a detection amount when analyzed by fluorescent X-rays.
- fluorescent X-rays For example, as a fluorescent X-ray analyzer, “ZSX Primus”, “ZSX Primus II”, etc. manufactured by Rigaku are listed.
- a colored ink having a reduced halogen content a colored ink that does not use a halogen- or sulfur-containing resin such as a vinyl chloride-based resin as a binder resin can be preferably used.
- a binder resin for example, polyurethane resin, polyester resin, polyamide resin, acrylic resin, nitrocellulose and the like can be used.
- a polyurethane resin can be preferably used and a polyester urethane resin can be particularly preferably used from the viewpoint of the adhesiveness with the pressure-sensitive adhesive layer and the adhesiveness with the resin film on which the colored layer is laminated.
- the glass transition temperature of the polyester urethane resin is preferably ⁇ 30 ° C. to 30 ° C., more preferably ⁇ 20 ° C. to 30 ° C., and ⁇ 15 ° C. More preferably, the temperature is -25 ° C, and particularly preferably -10 ° C to 25 ° C.
- the tan ⁇ peak temperature of the polyester urethane resin is within this range, the colored layer has suitable flexibility and hardness, so that the occurrence of cracks in the colored layer during rework is particularly unlikely, and the flow of ink at high temperatures Is unlikely to occur.
- the glass transition temperature of the polyester urethane resin is defined as the glass transition temperature, which is the tan ⁇ peak temperature of the dynamic viscoelastic spectrum at a frequency of 1 Hz measured as follows.
- Polyester urethane resin is formed to a thickness of 50 ⁇ m with a bar coater.
- a test piece (sample length 20 mm, film thickness 50 ⁇ ) cut to a sample length of 20 mm is used from a ⁇ 150 ° C. to 250 ° C. condition with a frequency of 1 Hz and a temperature increase time of 3 ° C./1 minute using a viscoelasticity testing machine
- the storage elastic modulus (G ′) and the loss elastic modulus (G ′′) are measured.
- the colored ink used in the colored layer contains a curing agent used in ordinary inks, but it is also preferable to contain an aliphatic or alicyclic isocyanate curing agent as the curing agent.
- an aliphatic or alicyclic isocyanate curing agent as the curing agent.
- Aliphatic or alicyclic isocyanates include hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, trimethylhexamethylene isocyanate, 1,6,11-undecane triisocyanate, lysine diisocyanate, lysine ester triisocyanate, 1,8-diisocyanate-4 -Isocyanate methyl octane, 1,3,6-hexamethylene triisocyanate, bicycloheptane triisocyanate are used.
- trimers of these isocyanates can be preferably used, and among them, diisocyanate adducts, biurets, and nurates are preferable.
- diisocyanate adducts, biurets, and nurates are preferable because the elastic modulus is easily controlled, and biuret or nurate is particularly preferable.
- curing agent may be added independently and may add 2 or more types.
- the colorant for coloring the color ink known and conventional pigments and dyes not containing halogen can be used.
- black carbon black
- red red pepper
- cyan blue
- blue aluminum powder
- pearl mica titanium powder from the viewpoint of weather resistance, heat resistance, and dispersibility in ink resins.
- the colored layer is a light shielding layer, those capable of forming a black ink layer are preferred, and carbon black is preferred because of its excellent light shielding properties.
- a titanium oxide can be used preferably.
- the addition amount of the colorant may be appropriately adjusted according to the use and the like, and is preferably 10 to 70% in the ink solid content containing the colorant. More preferably, it is 40 to 50%. If it is 10% or more, it preferably shows light shielding properties, and if it is 70% or less, the dispersion is good.
- the thickness of the colored layer may be appropriately adjusted according to desired characteristics.
- the colored layer is a light shielding layer, it is preferably from 1 to 10 ⁇ m, more preferably from 3 to 7 ⁇ m, from the viewpoints of light shielding properties and workability at the time of tape punching.
- the colored layer may be a single layer, but two or more layers may be laminated depending on the desired concealing property, light reflecting property, and light shielding property.
- the colored layer is a light shielding layer, it is preferable to provide two or more colored layers in order to improve the light shielding property and prevent light leakage due to pinholes.
- the colored tape shielding tape or shielding reflective tape of the present invention preferably has a light transmission amount of when irradiated with light of 10000 cd / m 2 on the support is 1 cd / m 2 or less, 0.1 cd / M 2 or less is more preferable.
- the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape for fixing an optical film, and is a pressure-sensitive adhesive tape provided with the pressure-sensitive adhesive layer attached to the optical film on at least one surface of a support.
- the form of the pressure-sensitive adhesive tape may be a single-sided pressure-sensitive adhesive tape provided with a pressure-sensitive adhesive layer on one side of the support, or a double-sided pressure-sensitive adhesive tape provided with pressure-sensitive adhesive layers on both sides of the support.
- a double-sided pressure-sensitive adhesive tape is preferable for fixing between the components for fixing the other members.
- the pressure-sensitive adhesive layer attached to the optical film has suitable adhesion to various adherends, particularly transparent panels such as glass panels. It is also preferable to use an adhesive layer.
- Each pressure-sensitive adhesive layer may be a single-layer pressure-sensitive adhesive layer or a plurality of pressure-sensitive adhesive layers laminated, or may be used in a form in which a plurality of pressure-sensitive adhesive tapes are laminated.
- it can also be applied to fixing between parts by using a separate double-sided adhesive tape on the surface that does not have an adhesive layer or by applying an adhesive. .
- the pressure-sensitive adhesive layer can be formed on a resin film or a light-shielding layer by a method generally used for applying a pressure-sensitive adhesive tape.
- the composition for forming the pressure-sensitive adhesive layer can be directly applied to the support and dried, or it can be applied on the separator, dried, and then bonded to the support.
- the thickness of the pressure-sensitive adhesive tape of the present invention is preferably 20 to 100 ⁇ m, and more preferably 30 to 75 ⁇ m. Of these, a thickness of 40 to 65 ⁇ m is particularly preferable. Those having a thickness in this range can be suitably used for fixing components of an image display device, particularly for an image display device of a small electronic device.
- the 180 degree peel adhesive strength of the pressure-sensitive adhesive tape of the present invention to the optical film and glass is preferably 7 to 15 N / 20 mm, more preferably 8 to 13 N / 20 mm.
- the components can be suitably fixed when fixing the components of the image display device.
- the adhesive tape of the present invention preferably has a halogen (chlorine / bromine / fluorine / iodine) content of 0.3% by mass or less, more preferably 0.05% by mass or less. Particularly preferred are those which do not substantially contain.
- the adhesive tape with reduced halogen is suitable for suppressing malfunction of the image display device.
- the pressure-sensitive adhesive layer is provided on the support as at least the pressure-sensitive adhesive layer to be attached to the optical film.
- the structure which has an adhesive layer affixed on an optical film in a colored layer surface can be used preferably.
- Preferred examples include a form having an adhesive layer on both sides of a support having a colored layer on one side of the resin film, a form having an adhesive layer on both sides of a support having a colored layer on both sides of the resin film, and the like. It can be illustrated.
- the colored layer is a light shielding layer made of black ink
- it can be used as a light shielding tape
- it is a light reflection layer made of white ink
- it can be used as a light reflecting tape.
- a light-shielding reflective tape can be used.
- the double-sided pressure-sensitive adhesive tape of the present invention is used for fixing an optical film, fixing an optical film and another member, and sticking an adhesive layer formed from the water-dispersed acrylic pressure-sensitive adhesive composition to the optical film.
- the pressure-sensitive adhesive tape of the present invention has a suitable adhesive force to the adherend, and can suppress distortion of the optical film even when deformation occurs in the optical film after fixing the optical film to other members. It is suitable for an image display device that requires fixing of an optical film and another member. Moreover, it has good adhesiveness and is particularly excellent in resilience resistance. For this reason, the optical film is likely to be distorted, and the adhesive tape is likely to be peeled off due to deformation such as twisting of the housing.
- a component fixing tape used for fixing an optical film of a display device It can be suitably used as a component fixing tape used for fixing an optical film of a display device.
- a light-shielding tape, light-reflecting tape, and light-shielding reflective tape for fixing the optical film and transparent panel of a thin image display device that requires suitable light-shielding / reflecting performance and requires reworkability at the time of defect or repair It can be suitably used.
- optical film examples include a prism sheet, a diffusion film, a light shielding film, and a reflective film.
- an optical film that is particularly susceptible to distortion includes a prism sheet in which a prism layer is provided on a film having a polarization reflection function.
- optical film examples include 3EF BEF-RP2RC and BEF-RP3.
- the double-sided pressure-sensitive adhesive tape of the present invention can suitably suppress distortion of the optical film, and is particularly suitable for an optical film having a size of about 2.5 to 7 inches (diagonal). There is a distortion suppression effect.
- the pressure-sensitive adhesive tape of the present invention can suppress distortion even with the optical film.
- the optical film has a prism layer and the ridge line of the prism layer obliquely intersects the flow direction of the adhesive tape, distortion of the optical film is likely to occur. Can be suitably suppressed.
- Other members that are fixed to the optical film by the double-sided adhesive tape of the present invention may be various members that are fixed to the optical film in the image display device.
- liquid crystal provided on the surface layer of the image display device (LC) panel, electroluminescence panel, plasma display panel, electronic paper display panel, and other display panels. These display panels are used alone with glass or plastic, or with a functional film such as a polarizing film attached thereto.
- a functional film such as a polarizing film attached thereto.
- the double-sided pressure-sensitive adhesive tape of the present invention when the pressure-sensitive adhesive layer using the above water-dispersed acrylic pressure-sensitive adhesive composition is used on both surfaces, the adhesiveness with a glass panel or a polarizing film is particularly excellent.
- the aspect of fixing the optical film and the other member is not particularly limited as long as the image display area of the image display device can be secured, but preferably a double-sided pressure-sensitive adhesive tape having a frame shape by punching or the like
- the aspect of fixing the edge peripheral area of two or more sides of the rectangular optical film with a rectangular double-sided adhesive tape, the edge peripheral area of the rectangular optical film A mode of fixing with a small piece of double-sided adhesive tape at an arbitrary gap can be exemplified.
- a backlight type LCD etc.
- a reflection plate, a light guide plate, a diffusion sheet, etc. are laminated, and an optical film such as a prism sheet is provided on the surface layer
- a backlight module in which a light reflector such as a light emitting diode (LED) having a lamp reflector provided on the side of the light guide plate and a cold cathode tube and a display panel (LCD panel) are sequentially stacked.
- a preferable embodiment of the pressure-sensitive adhesive tape of the present invention is a mode in which the adhesive tape is punched out and sandwiched between the display panel and the optical film on the surface of the backlight module.
- the double-sided pressure-sensitive adhesive tape is attached to the optical film on the surface of the backlight module.
- casing in which the light module was accommodated may be sufficient.
- the double-sided pressure-sensitive adhesive tape for fixing a glass panel optical film of the present invention can suppress malfunction of peripheral devices and gives a highly reliable product. Therefore, various electronic devices, particularly electronic notebooks, mobile phones, smartphones (high function Mobile phone), PHS, game device, electronic book, multi-function data terminal, mobile personal computer, etc., can be suitably used for fixing a glass panel of a display device of a miniaturized portable electronic device.
- Mn polyester diol
- a polyester urethane resin (A) having a concentration of 30.0%, Gardner viscosity UV (25 ° C.), amine value 0, mass average molecular weight (hereinafter referred to as Mw) 67,000 was obtained.
- Mw mass average molecular weight
- a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of the emulsion (1), 5.0 g ammonium persulfate aqueous solution [3% active ingredient], 5.0 g sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour.
- the remaining emulsion (1) 629.5 g and ammonium persulfate aqueous solution 40 g [active ingredient 1.25%] were dropped and polymerized over 8 hours while keeping the reaction vessel at 60 ° C. using separate funnels. .
- the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (active ingredient 10%) so that the pH was 7.5. This was filtered through a 200-mesh wire mesh to obtain 1013.5 g of an acrylic copolymer (1) emulsion.
- the emulsion of the obtained acrylic copolymer (1) had a solid content concentration of 50% and an average particle size of 341 nm.
- Emulsion (2) 632.7 g was obtained.
- ⁇ Preparation of emulsion of acrylic copolymer (2)> In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of emulsion (2), 5.0 g ammonium persulfate aqueous solution [3% active ingredient] and 5.0 g sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour.
- Emulsion (3) 632.7 g was obtained.
- the remaining emulsion (1) 629.5 g and ammonium persulfate aqueous solution 40 g [active ingredient 1.25%] were dropped and polymerized over 8 hours while keeping the reaction vessel at 60 ° C. using separate funnels. .
- the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (active ingredient 10%) so that the pH was 7.5. This was filtered through a 200-mesh wire mesh to obtain 1013.5 g of an acrylic copolymer (3) emulsion.
- the emulsion of the obtained acrylic copolymer (3) had a solid content concentration of 50% and an average particle size of 330 nm.
- Production Example 2 A water-dispersed acrylic pressure-sensitive adhesive similar to Production Example 1 except that the amount of the crosslinking agent 0.15 g (0.03 parts by mass) in Production Example 1 was changed to 0.2 g (0.04 parts by mass). Composition (2) was produced.
- Production Example 3 A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 1 except that the amount of the crosslinking agent 0.15 g (0.03 parts by mass) in Production Example 1 was changed to 0.25 g (0.05 parts by mass). A composition (3) was produced.
- Production Example 6 Water-dispersed acrylic pressure-sensitive adhesive as in Production Example 5 except that the amount of the crosslinking agent in Production Example 5 was changed to 0.25 g (0.05 parts by mass) and 0.4 g (0.08 parts by mass). A composition (6) was produced.
- Production Example 8 A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 7, except that the amount of the crosslinking agent in Production Example 7 was changed to 0.4 g (0.08 parts by mass) from 0.5 g (0.1 parts by mass). A composition (8) was produced.
- Example 1 The water-dispersed acrylic pressure-sensitive adhesive composition (1) obtained in Production Example 1 was coated on a 75 ⁇ m-thick polyester film subjected to a release treatment so that the thickness after drying was 20 ⁇ m, and 85 ° C. And dried for 2 minutes to obtain an adhesive layer. The obtained pressure-sensitive adhesive layer was transferred to both sides of the ink coat film (A), laminated with a heat roll of 80 ° C. at a pressure of 4 kgf / cm, and further cured at 40 ° C. for 2 days. A double-sided adhesive tape was obtained.
- Example 2 to 14 Double-sided pressure-sensitive adhesive tapes of Examples 2 to 14 were obtained in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive compositions (2) to (14) obtained in Production Examples 2 to 14 were used. .
- Comparative Examples 1 to 6 The double-sided pressure-sensitive adhesive tapes of Comparative Examples 1 to 6 were prepared in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive compositions (H1) to (H6) obtained in Comparative Production Examples 1 to 6 were used. Obtained.
- the tackifying resin was dried at 60 ° C. for 2 days or more under vacuum using a vacuum dryer to obtain a test sample having a dry weight of 10 mg.
- the test sample was measured twice continuously in a temperature range of ⁇ 50 ° C. to 200 ° C. at a temperature rising rate of 2 ° C./min. And the glass transition temperature was measured from the second measurement data.
- a pressure-sensitive adhesive layer prepared according to the production conditions for the pressure-sensitive adhesive tape was laminated to a thickness of 5 mm to prepare a test piece.
- a viscoelasticity tester (trade name: Ares 2KFRTN1 manufactured by Rheometrix Co., Ltd.)
- a test piece is sandwiched between parallel disks that are measuring units of the tester, and the frequency is 1 Hz and the heating rate is 2 ° C./min.
- the storage elastic modulus (G ′) and loss elastic modulus (G ′′) from 50 ° C. to 150 ° C. were measured, and tan ⁇ was calculated based on the following formula to obtain the glass transition temperature.
- tan ⁇ G ′′ / G ′
- the adhesive tapes of the present invention of Examples 1 to 14 can suitably suppress the waviness and distortion of the optical film while using the water-based adhesive with reduced VOC, and It had good resilience resistance.
- the pressure-sensitive adhesive tape of the comparative example cannot achieve both the suppression of the undulation and distortion of the optical film and the resilience resistance.
- Double-sided adhesive tape 11 Double-sided adhesive tape 11: Optical film 12: Glass 20: Adhesive tape 21: PC board 22: PET film 23: Double-sided tape
Abstract
Description
本発明の粘着テープにおいて、光学フィルムに貼り付けられる粘着剤層は、水性媒体中にアクリル系共重合体エマルジョン粒子が分散した水分散型アクリル系粘着剤組成物から形成される粘着剤層である。本発明においては、当該粘着剤層のガラス転移温度(Tg)を-5℃以下、好ましくは-10℃以下、さらに好ましくは-15℃以下とすることで、粘着剤の柔軟性を十分に確保する。これにより、光学フィルムに歪みが生じた場合にも当該歪みに好適に追従しつつ歪みを抑制できる。また、粘着剤が被着体へ十分に濡れることにより、被着体と粘着剤の密着が確保され、好適な耐反発性を実現できる。 [Adhesive layer]
In the pressure-sensitive adhesive tape of the present invention, the pressure-sensitive adhesive layer attached to the optical film is a pressure-sensitive adhesive layer formed from a water-dispersed acrylic pressure-sensitive adhesive composition in which acrylic copolymer emulsion particles are dispersed in an aqueous medium. . In the present invention, the pressure-sensitive adhesive layer has a glass transition temperature (Tg) of −5 ° C. or lower, preferably −10 ° C. or lower, more preferably −15 ° C. or lower. To do. Thereby, even when distortion arises in an optical film, distortion can be controlled, following the distortion suitably. Further, when the pressure sensitive adhesive is sufficiently wetted with the adherend, adhesion between the adherend and the pressure sensitive adhesive is ensured, and suitable rebound resistance can be realized.
tanδ=G”/G’
試験片は厚み0.5~2.5mmの粘着剤を単独で平行円盤の間に挟んでも良いが、基材と粘着剤の積層体を幾重にも重ねて平行円盤の間に挟んでも良い。なお、後者の場合は中間に基材が挟まっていても粘着剤の動的粘弾性スペクトルの損失正接のピーク温度に影響はない。 The glass transition temperature of the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention is the peak temperature of the loss tangent (tan δ) of the dynamic viscoelastic spectrum. The measurement of dynamic viscoelasticity is performed by, for example, using a viscoelasticity tester (Rheometrics, trade name: Ares 2KFRTN1), inserting a test piece between parallel disks as measurement units of the tester, and a frequency of 1 Hz. Then, the storage elastic modulus (G ′) and loss elastic modulus (G ″) from −50 ° C. to 150 ° C. are measured at a rate of temperature rise of 2 ° C./min. Tan δ is calculated from the following calculation formula.
tan δ = G ″ / G ′
In the test piece, an adhesive having a thickness of 0.5 to 2.5 mm may be sandwiched between parallel disks alone, or a laminate of a base material and an adhesive may be stacked in layers and sandwiched between parallel disks. In the latter case, even if the base material is sandwiched in the middle, the peak temperature of the loss tangent of the dynamic viscoelastic spectrum of the adhesive is not affected.
粘着剤層に使用する水分散型アクリル系粘着剤組成物としては、水性媒体中にアクリル系共重合体のエマルジョン粒子が分散した組成物を使用できる。当該アクリル系共重合体としては、動的粘弾性スペクトルにて測定されるガラス転移温度が-45℃~-25℃であることが好ましく、-40℃~-30℃であることがより好ましい。アクリル系共重合体のガラス転移温度を当該範囲とすることで、粘着剤の柔軟性を十分に確保し易くなる。これにより、光学フィルムに歪みが生じた場合にも当該歪みに好適に追従しつつ歪みを抑制し易くなる。また、粘着剤が被着体へ十分に濡れることにより、被着体と粘着剤の密着が確保され易くなり、好適な耐反発性を実現し易くなる。 (Acrylic copolymer)
As the water-dispersed acrylic pressure-sensitive adhesive composition used for the pressure-sensitive adhesive layer, a composition in which emulsion particles of an acrylic copolymer are dispersed in an aqueous medium can be used. The acrylic copolymer preferably has a glass transition temperature of −45 ° C. to −25 ° C., more preferably −40 ° C. to −30 ° C., as measured by a dynamic viscoelastic spectrum. By setting the glass transition temperature of the acrylic copolymer within the range, it becomes easy to sufficiently secure the flexibility of the pressure-sensitive adhesive. Thereby, even when distortion occurs in the optical film, it becomes easy to suppress the distortion while suitably following the distortion. In addition, when the pressure-sensitive adhesive is sufficiently wetted with the adherend, it is easy to ensure adhesion between the adherend and the pressure-sensitive adhesive, and it is easy to realize suitable repulsion resistance.
本発明に使用する水分散型アクリル系粘着剤組成物においては、被着体への十分な濡れ性、密着性を発現、応力に耐えうる凝集力が向上のために粘着付与樹脂を使用することが好ましい。当該粘着付与樹脂のガラス転移温度は、30~120℃であることが好ましく、より好ましくは40~100℃であり、さらに好ましく45~80℃であり、一層好ましくは50~60℃である。アクリル系共重合体よりもガラス転移温度の高い粘着付与樹脂を配合することで、強接着性が向上する。 (Tackifying resin)
In the water-dispersed acrylic pressure-sensitive adhesive composition used in the present invention, a tackifying resin should be used to develop sufficient wettability and adhesion to an adherend and to improve cohesive strength to withstand stress. Is preferred. The glass transition temperature of the tackifying resin is preferably 30 to 120 ° C, more preferably 40 to 100 ° C, still more preferably 45 to 80 ° C, and still more preferably 50 to 60 ° C. By adding a tackifier resin having a glass transition temperature higher than that of the acrylic copolymer, the strong adhesiveness is improved.
本発明に使用する水分散型アクリル系粘着剤組成物においては、得られる粘着剤層の凝集力を向上させる目的で、架橋剤を使用することが好ましい。架橋剤としては、公知のイソシアネート系架橋剤、エポキシ系架橋剤、アジリジン系架橋剤、多価金属塩系架橋剤、金属キレート系架橋剤、ケト・ヒドラジド系架橋剤、オキサゾリン系架橋剤、カルボジイミド系架橋剤、シラン系架橋剤、グリシジル(アルコキシ)エポキシシラン系架橋剤等が使用できる。その中でも、重合終了後に添加し、架橋反応を進行させるタイプの架橋剤が好ましい。例えば、イソシアネート系架橋剤、エポキシ系架橋剤、オキサゾリン系架橋剤、カルボジイミド系架橋剤、グリシジル(アルコキシ)エポキシシラン系架橋剤等が挙げられる。具体的には、イソシアネート系架橋剤では、バーノック DNW-5000[DIC(株)製]、バーノック DNW-5010[DIC(株)製]、バーノック DNW-5100[DIC(株)製]、バーノック DNW-5500[DIC(株)製]、アクアネート100[日本ポリウレタン工業(株)製]、アクアネート105[日本ポリウレタン工業(株)製]、アクアネート110[日本ポリウレタン工業(株)製]、アクアネート120[日本ポリウレタン工業(株)製]、アクアネート130[日本ポリウレタン工業(株)製]、アクアネート200[日本ポリウレタン工業(株)製]、アクアネート210[日本ポリウレタン工業(株)製]、LS2319[住化バイエルウレタン(株)製]、LS2336[住化バイエルウレタン(株)製]、Bayhydur3100[住化バイエルウレタン(株)製]等が挙げられ、エポキシ系架橋剤では、デナコール EX-832[ナガセ化成工業(株)製]、デナコール EX-841[ナガセ化成工業(株)製]、テトラッドC[三菱瓦斯化学(株)製]、テトラッドX[三菱瓦斯化学(株)製]等が挙げられ、オキサゾリン系架橋剤では、エポクロスWS-500[(株)日本触媒製]、エポクロスWS-700[(株)日本触媒製]、エポクロスK-2010E[(株)日本触媒製]、エポクロスK-2020E[(株)日本触媒製]、エポクロスK-2030E[(株)日本触媒製]が挙げられ、カルボジイミド系架橋剤では、カルボジライトSV-02[日清紡績(株)]、カルボジライトV-02[日清紡績(株)]、カルボジライトV-02-L2[日清紡績(株)]、カルボジライトV-04[日清紡績(株)]、カルボジライトE-01[日清紡績(株)]、カルボジライトE-02[日清紡績(株)]、カルボジライトE-03A[日清紡績(株)]、カルボジライトE-04[日清紡績(株)]、グリシジル(アルコキシ)エポキシシラン系架橋剤では、2-(3,4-エポキシシクロヘキシルエチルトリメトキシシラン[KBM-303;信越シリコーン(株)製]、γ-グリシドキシプロピルトリメトキシシラン[KBM-403;信越シリコーン(株)製]、γ-グリシドキシプロピルメチルジエトキシシラン[KBE-402;信越シリコーン(株)製]、γ-グリシドキシプロピルトリエトキシシラン[KBE-403;信越シリコーン(株)製]等が挙げられる。 (Crosslinking agent)
In the water-dispersed acrylic pressure-sensitive adhesive composition used in the present invention, it is preferable to use a crosslinking agent for the purpose of improving the cohesive strength of the resulting pressure-sensitive adhesive layer. Examples of the crosslinking agent include known isocyanate crosslinking agents, epoxy crosslinking agents, aziridine crosslinking agents, polyvalent metal salt crosslinking agents, metal chelate crosslinking agents, keto-hydrazide crosslinking agents, oxazoline crosslinking agents, and carbodiimide crosslinking agents. A crosslinking agent, a silane crosslinking agent, a glycidyl (alkoxy) epoxysilane crosslinking agent, or the like can be used. Among them, a type of crosslinking agent that is added after the completion of polymerization and causes the crosslinking reaction to proceed is preferable. Examples thereof include an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an oxazoline-based crosslinking agent, a carbodiimide-based crosslinking agent, and a glycidyl (alkoxy) epoxysilane-based crosslinking agent. Specifically, for the isocyanate-based crosslinking agent, Vernock DNW-5000 (manufactured by DIC Corporation), Vernock DNW-5010 (manufactured by DIC Corporation), Vernock DNW-5100 (manufactured by DIC Corporation), Vernock DNW- 5500 [manufactured by DIC Corporation], Aquanate 100 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 105 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 110 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 120 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 130 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 200 [manufactured by Nippon Polyurethane Industry Co., Ltd.], Aquanate 210 [manufactured by Nippon Polyurethane Industry Co., Ltd.], LS2319 [manufactured by Sumika Bayer Urethane Co., Ltd.], LS2336 [Sumika Bayer Ure Tanhy Co., Ltd.], Bayhydur 3100 [manufactured by Sumika Bayer Urethane Co., Ltd.], etc., and epoxy-based crosslinking agents include Denacol EX-832 [Nagase Kasei Kogyo Co., Ltd.], Denacol EX-841 [Nagase Kasei] Kogyo Co., Ltd.], Tetrad C [Mitsubishi Gas Chemical Co., Ltd.], Tetrad X [Mitsubishi Gas Chemical Co., Ltd.], etc., and for oxazoline-based crosslinking agents, Epocros WS-500 [Japan Co., Ltd.] Catalysts], Epocross WS-700 [Nippon Shokubai Co., Ltd.], Epocross K-2010E [Nippon Shokubai Co., Ltd.], Epocross K-2020E [Nippon Shokubai Co., Ltd.], Epocross K-2030E [Co., Ltd. ) Manufactured by Nippon Shokubai Co., Ltd., and carbodiimide-based cross-linking agents include Carbodilite SV-02 [Nisshinbo Co., Ltd.], Carbodilite V-02 [Nisshinbo ( )], Carbodilite V-02-L2 [Nisshinbo Co., Ltd.], Carbodilite V-04 [Nisshinbo Co., Ltd.], Carbodilite E-01 [Nisshinbo Co., Ltd.], Carbodilite E-02 [Nisshinbo Co., Ltd.] )], Carbodilite E-03A [Nisshinbo Co., Ltd.], Carbodilite E-04 [Nisshinbo Co., Ltd.], and glycidyl (alkoxy) epoxysilane crosslinking agents, 2- (3,4-epoxycyclohexylethyltrimethoxy Silane [KBM-303; manufactured by Shin-Etsu Silicone Co., Ltd.], γ-glycidoxypropyltrimethoxysilane [KBM-403; manufactured by Shin-Etsu Silicone Co., Ltd.], γ-glycidoxypropylmethyldiethoxysilane [KBE-402 ; Shin-Etsu Silicone Co., Ltd.], γ-glycidoxypropyltriethoxysilane [KBE-403; Shin-Etsu Silico Manufactured by Co., Ltd.] and the like.
本発明に使用する水分散型アクリル系粘着剤組成物においては、添加剤として、必要に応じて本発明の所望の効果を阻害しない範囲で、pHを調整するための塩基(アンモニア水など)や酸、可塑剤、軟化剤、酸化防止剤、ガラスやプラスチック製の繊維・バルーン・ビーズ・金属粉末等の充填剤、顔料・染料等の着色剤、pH調整剤、皮膜形成補助剤、レベリング剤、増粘剤、撥水剤、消泡剤等の公知のものを粘着剤組成物に任意で添加することがで (Additive)
In the water-dispersed acrylic pressure-sensitive adhesive composition used in the present invention, as an additive, a base (such as aqueous ammonia) for adjusting the pH within a range that does not impair the desired effect of the present invention, if necessary, Acids, plasticizers, softeners, antioxidants, fillers such as glass and plastic fibers, balloons, beads, and metal powders, colorants such as pigments and dyes, pH adjusters, film formation aids, leveling agents, Known agents such as thickeners, water repellents and antifoaming agents can be optionally added to the adhesive composition.
本発明に使用する支持体は、特に制限されず、画像表示装置周辺部材固定に使用される各種支持体を使用できる。当該支持体としては、例えば、樹脂フィルムのみからなる支持体や、樹脂フィルムに着色層が設けられた支持体であってもよい。光学フィルムと他の部材の固定、特に光学フィルムと透明パネルとの固定に際しては、遮光性能や光反射性能が求められることが多いため、良好な遮光性能や光反射性能を実現する際には、樹脂フィルムに着色層が設けられた支持体を好ましく使用できる。 [Support]
The support used in the present invention is not particularly limited, and various supports used for fixing the image display device peripheral member can be used. As the said support body, the support body in which the colored layer was provided in the support body which consists only of a resin film, for example may be sufficient. When fixing the optical film and other members, especially when fixing the optical film and the transparent panel, light shielding performance and light reflection performance are often required, so when realizing good light shielding performance and light reflection performance, A support in which a colored layer is provided on a resin film can be preferably used.
バーコーターにてポリエステルウレタン樹脂を厚さ50μmに製膜する。次に試料長さ20mmにカットした試験片(試料長20mm、膜厚50μ)を粘弾性試験機を用いて、周波数1Hz、昇温時間3℃/1分の条件で-150℃から250℃までの貯蔵弾性率(G’)と損失弾性率(G”)を測定する。損失正接tanδは、以下の計算式より算出する。
損失正接tanδ=G”/G’
粘弾性試験機としては例えば、セイコーインスツル社製DMS210、DMS220、DMS6100等があげられる。 The glass transition temperature of the polyester urethane resin is defined as the glass transition temperature, which is the tan δ peak temperature of the dynamic viscoelastic spectrum at a frequency of 1 Hz measured as follows.
Polyester urethane resin is formed to a thickness of 50 μm with a bar coater. Next, a test piece (
Loss tangent tan δ = G ″ / G ′
Examples of the viscoelasticity tester include DMS210, DMS220, and DMS6100 manufactured by Seiko Instruments Inc.
本発明の粘着テープは、光学フィルムを固定する粘着テープであり、支持体の少なくとも片面に光学フィルムに貼り付けられる上記粘着剤層が設けられた粘着テープである。当該構成により、VOCの低減による優れた環境対応性を有しつつ、歪みの生じやすい光学フィルムを好適に固定でき、良好な耐反発性を有すると共に、光学フィルムの歪みを好適に抑制できる。 [Adhesive tape]
The pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape for fixing an optical film, and is a pressure-sensitive adhesive tape provided with the pressure-sensitive adhesive layer attached to the optical film on at least one surface of a support. With this configuration, it is possible to suitably fix an optical film that is likely to be distorted while having excellent environmental compatibility due to VOC reduction, and it is possible to suitably suppress distortion of the optical film while having good repulsion resistance.
本発明の両面粘着テープは、光学フィルムの固定、光学フィルムと他の部材との固定に使用され、上記水分散型アクリル系粘着剤組成物から形成される粘着剤層を光学フィルムに貼り付けて使用される。本発明の粘着テープは、被着体への好適な接着力を有し、光学フィルムを他の部材と固定した後に、光学フィルムに変形が生じた場合にも光学フィルムの歪みを抑制できることから、光学フィルムと他の部材との固定が求められる画像表示装置に好適である。また、良好な接着性を有し、特に耐反発性に優れる。このため、光学フィルムの歪みが生じやすく、筐体のねじれ等の変形により粘着テープの剥がれが生じやすい画像表示装置の光学フィルムの固定用、特に省スペースにて部品固定がなされている薄型の画像表示装置の光学フィルム固定に用いられる部品固定テープとして好適に使用できる。また、好適な遮光反射性能が求められ、かつ不良時や修理時にリワーク性の要求される薄型の画像表示装置の光学フィルムと透明パネルとを固定する遮光テープ、光反射テープ、遮光反射テープとしても好適に使用できる。 [Usage]
The double-sided pressure-sensitive adhesive tape of the present invention is used for fixing an optical film, fixing an optical film and another member, and sticking an adhesive layer formed from the water-dispersed acrylic pressure-sensitive adhesive composition to the optical film. used. The pressure-sensitive adhesive tape of the present invention has a suitable adhesive force to the adherend, and can suppress distortion of the optical film even when deformation occurs in the optical film after fixing the optical film to other members. It is suitable for an image display device that requires fixing of an optical film and another member. Moreover, it has good adhesiveness and is particularly excellent in resilience resistance. For this reason, the optical film is likely to be distorted, and the adhesive tape is likely to be peeled off due to deformation such as twisting of the housing. It can be suitably used as a component fixing tape used for fixing an optical film of a display device. In addition, as a light-shielding tape, light-reflecting tape, and light-shielding reflective tape for fixing the optical film and transparent panel of a thin image display device that requires suitable light-shielding / reflecting performance and requires reworkability at the time of defect or repair It can be suitably used.
外形変化率=[(静置後長さ-静置前長さ)/(静置前長さ)]×100(%) The greater the rate of change in the outer shape of the optical film, the more likely the distortion occurs, and the more the distortion occurs when the behavior changes in the flow direction and the width direction. Distortion occurs particularly when the rate of change is greater than ± 0.05% in the flow direction or width direction, especially when the rate of change is greater than + 0.06% in the flow direction and greater than -0.06% in the width direction. It's easy to do. The pressure-sensitive adhesive tape of the present invention can suppress distortion even with the optical film. In addition, the external shape change rate of an optical film is represented by the following formula before and behind standing at 85 degreeC for 5 minutes.
External form change rate = [(length after standing−length before standing) / (length before standing)] × 100 (%)
(ポリエステルウレタン樹脂(A))
攪拌機,温度計,還流冷却器および窒素ガス導入管を備えた四つロフラスコにアジピン酸/テレフタル酸=50/50なる酸成分と3一メチル‐1,5ペンタンジオールから得られる数平均分子量(以下Mnという)2,000のポリエステルジオール256.3部とイソホロンジイソシアネート36.5部を仕込み、窒素気流下に90℃で15時間反応させた。次いでイソホロンジアミン5.0部、ジ‐n‐ブチルアミン2.2部、トルエン175部、メチルエチルケトン350部、イソプロピレンアルコール175部を添加し、攪枠下に40℃で3時間反応させ、樹脂固形分濃度30.0%、ガードナー粘度U-V(25℃)、アミン価=0、質量平均分子量(以下Mwという)67,000のポリエステルウレタン樹脂(A)を得た。得られた樹脂のtanδのピーク温度は-8℃であった。 [Production example of polyester urethane]
(Polyester urethane resin (A))
Number average molecular weight obtained from acid component of adipic acid / terephthalic acid = 50/50 and trimethyl-1,5-pentanediol (below) in a four-flask equipped with stirrer, thermometer, reflux condenser and nitrogen gas introduction tube 256.3 parts of 2,000 polyester diol (referred to as Mn) and 36.5 parts of isophorone diisocyanate were charged and reacted at 90 ° C. for 15 hours under a nitrogen stream. Next, 5.0 parts of isophoronediamine, 2.2 parts of di-n-butylamine, 175 parts of toluene, 350 parts of methyl ethyl ketone, and 175 parts of isopropylene alcohol were added and reacted under a stirring frame at 40 ° C. for 3 hours to obtain a resin solid content. A polyester urethane resin (A) having a concentration of 30.0%, Gardner viscosity UV (25 ° C.), amine value = 0, mass average molecular weight (hereinafter referred to as Mw) 67,000 was obtained. The peak temperature of tan δ of the obtained resin was −8 ° C.
(黒色インキの製造例1)
デグサ社製「カーボンデグサスペシャル4A」を4部、デグサ社製「カーボンスペシャル250P」6部、ポリエステルウレタン樹脂(A)(tanδピーク温度=-8℃)を40部、メチルエチルケトンを23部、トルエンを13部、酢酸エチルを6部、N-プロピルアセテートを3部、イソプロピルアルコール3部を添加し、サンドミルで約1時間湿式分散した物に、DIC社製硬化剤「KR90」(ヘキサメチレンジジイソシアネートのビウレット体)を4部、DIC社製希釈剤「ダイレジューサーV No.20」を35部添加して黒色インキ(A)を作成した。なお、樹脂は固形分比を表す。 [Black ink production example]
(Black ink production example 1)
4 parts of Degussa “Carbon Degussa Special 4A”, 6 parts of Degussa “Carbon Special 250P”, 40 parts of polyester urethane resin (A) (tan δ peak temperature = −8 ° C.), 23 parts of methyl ethyl ketone, toluene 13 parts, 6 parts of ethyl acetate, 3 parts of N-propyl acetate and 3 parts of isopropyl alcohol were added, and the mixture was wet-dispersed with a sand mill for about 1 hour, and a curing agent “KR90” (hexamethylene diisocyanate A black ink (A) was prepared by adding 4 parts of biuret body) and 35 parts of DIC Corporation diluent “Direducer V No. 20”. In addition, resin represents solid content ratio.
(インキコートフィルム(A))
帝人デュポンフィルム(株)製テフレックスFW2#13(厚さ:13μm、引張強度23N/20mm)に表面状態が50ダイン以上になるようコロナ処理を行い、その上に黒色インキ(A)を乾燥厚みが4μmになるよう2回グラビアコートした。尚、乾燥は常温で2分間放置した。その後40℃で2日間養生し、インキコートフィルム(A)を得た。 [Production of support]
(Ink coat film (A))
A Terajin DuPont Films Co., Ltd. Teflex FW2 # 13 (thickness: 13 μm, tensile strength 23 N / 20 mm) is subjected to corona treatment so that the surface state becomes 50 dynes or more, and then the black ink (A) is dried to a thickness. Was twice gravure coated so that the thickness of the film became 4 μm. The drying was left at room temperature for 2 minutes. Thereafter, the film was cured at 40 ° C. for 2 days to obtain an ink coat film (A).
(調製例1)
<乳化液(1)の調製>
容器にイオン交換水75.0gと界面活性剤アクアロンKH-1025[第一工業製薬(株)製;有効成分25%]20.0gと界面活性剤ラテムルPD-104[花王(株)製;有効成分20%]37.5gを入れ、均一に溶解した。そこに、n-ブチルアクリレート227.5g、2-エチルヘキシルアクリレート227.5g、メチルメタクリレート25.0g、N-ビニルピロリドン7.5g、アクリル酸1.5g、メタクリル酸11.0g、ラウリルメルカプタン0.2gを加えて乳化し、乳化液(1)632.7gを得た。 [Preparation method of acrylic copolymer emulsion]
(Preparation Example 1)
<Preparation of emulsion (1)>
In the container, 75.0 g of ion-exchanged water and surfactant Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25%] 20.0 g and surfactant Latemul PD-104 [manufactured by Kao Corp .;
攪拌機、還流冷却管、窒素導入管、温度計、滴下漏斗を備えた反応容器に、イオン交換水340gを入れ、窒素を吹き込みながら60℃まで昇温した。攪拌下、乳化液(1)の一部[3.2g]、過硫酸アンモニウム水溶液5.0g[有効成分3%]、亜硫酸水素ナトリウム水溶液5.0g[有効成分3%]を添加し、60℃を保ちながら1時間で重合させた。引き続き、残りの乳化液(1)629.5gと、過硫酸アンモニウム水溶液40g[有効成分1.25%]を別々の漏斗を使用して、反応容器を60℃に保ちながら8時間かけて滴下重合した。滴下終了後、反応容器を60℃に保ちながら2時間攪拌した後、内容物を冷却し、引き続き、pHが7.5になるようにアンモニア水(有効成分10%)で調製した。これを200メッシュ金網で濾過し、アクリル系共重合体(1)のエマルジョン1013.5gを得た。ここで、得られたアクリル系共重合体(1)のエマルジョンは固形分濃度50%、平均粒子径は341nmであった。 <Preparation of emulsion of acrylic copolymer (1)>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of the emulsion (1), 5.0 g ammonium persulfate aqueous solution [3% active ingredient], 5.0 g sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour. Subsequently, the remaining emulsion (1) 629.5 g and ammonium persulfate aqueous solution 40 g [active ingredient 1.25%] were dropped and polymerized over 8 hours while keeping the reaction vessel at 60 ° C. using separate funnels. . After completion of the dropwise addition, the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (
<乳化液(2)の調製>
容器にイオン交換水75.0gと界面活性剤アクアロンKH-1025[第一工業製薬(株)製;有効成分25%]20.0gと界面活性剤ラテムルPD-104[花王(株)製;有効成分20%]37.5gを入れ、均一に溶解した。そこに、n-ブチルアクリレート227.5g、2-エチルヘキシルアクリレート227.5g、メチルメタクリレート25.0g、N-ビニルピロリドン7.5g、アクリル酸12.5g、ラウリルメルカプタン0.20gを加えて乳化し、乳化液(2)632.7gを得た。 (Preparation Example 2)
<Preparation of emulsion (2)>
In the container, 75.0 g of ion-exchanged water and surfactant Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25%] 20.0 g and surfactant Latemul PD-104 [manufactured by Kao Corp .;
攪拌機、還流冷却管、窒素導入管、温度計、滴下漏斗を備えた反応容器に、イオン交換水340gを入れ、窒素を吹き込みながら60℃まで昇温した。攪拌下、乳化液(2)の一部[3.2g]、過硫酸アンモニウム水溶液5.0g[有効成分3%]、亜硫酸水素ナトリウム水溶液5.0g[有効成分3%]を添加し、60℃を保ちながら1時間で重合させた。引き続き、残りの乳化液(2)629.5gと、過硫酸アンモニウム水溶液40g[有効成分1.25%]を別々の漏斗を使用して、反応容器を60℃に保ちながら8時間かけて滴下重合した。滴下終了後、反応容器を60℃に保ちながら2時間攪拌した後、内容物を冷却し、引き続き、pHが7.5になるようにアンモニア水(有効成分10%)で調製した。これを200メッシュ金網で濾過し、アクリル系共重合体(2)のエマルジョン1013.5gを得た。ここで、得られたアクリル系共重合体(2)のエマルジョンは固形分濃度50%、平均粒子径は338nmであった。 <Preparation of emulsion of acrylic copolymer (2)>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of emulsion (2), 5.0 g ammonium persulfate aqueous solution [3% active ingredient] and 5.0 g sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour. Subsequently, 629.5 g of the remaining emulsion (2) and 40 g of an aqueous ammonium persulfate solution (active ingredient 1.25%) were dropped and polymerized using a separate funnel over 8 hours while maintaining the reaction vessel at 60 ° C. . After completion of the dropwise addition, the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (
<乳化液(3)の調製>
容器にイオン交換水75.0gと界面活性剤アクアロンKH-1025[第一工業製薬(株)製;有効成分25%]20.0gと界面活性剤ラテムルPD-104[花王(株)製;有効成分20%]37.5gを入れ、均一に溶解した。そこに、n-ブチルアクリレート50.0g、2-エチルヘキシルアクリレート405.0g、メチルメタクリレート25.0g、N-ビニルピロリドン7.5g、アクリル酸12.5g、ラウリルメルカプタン0.20gを加えて乳化し、乳化液(3)632.7gを得た。 (Preparation Example 3)
<Preparation of emulsion (3)>
In the container, 75.0 g of ion-exchanged water and surfactant Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25%] 20.0 g and surfactant Latemul PD-104 [manufactured by Kao Corp .;
攪拌機、還流冷却管、窒素導入管、温度計、滴下漏斗を備えた反応容器に、イオン交換水340gを入れ、窒素を吹き込みながら60℃まで昇温した。攪拌下、乳化液(3)の一部[3.2g]、過硫酸アンモニウム水溶液5.0g[有効成分3%]、亜硫酸水素ナトリウム水溶液5.0g[有効成分3%]を添加し、60℃を保ちながら1時間で重合させた。引き続き、残りの乳化液(1)629.5gと、過硫酸アンモニウム水溶液40g[有効成分1.25%]を別々の漏斗を使用して、反応容器を60℃に保ちながら8時間かけて滴下重合した。滴下終了後、反応容器を60℃に保ちながら2時間攪拌した後、内容物を冷却し、引き続き、pHが7.5になるようにアンモニア水(有効成分10%)で調製した。これを200メッシュ金網で濾過し、アクリル系共重合体(3)のエマルジョン1013.5gを得た。ここで、得られたアクリル系共重合体(3)のエマルジョンは固形分濃度50%、平均粒子径は330nmであった。 <Preparation of emulsion of acrylic copolymer (3)>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of emulsion (3), 5.0 g of ammonium persulfate aqueous solution [3% active ingredient] and 5.0 g of sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour. Subsequently, the remaining emulsion (1) 629.5 g and ammonium persulfate aqueous solution 40 g [active ingredient 1.25%] were dropped and polymerized over 8 hours while keeping the reaction vessel at 60 ° C. using separate funnels. . After completion of the dropwise addition, the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (
<乳化液(4)の調製>
容器にイオン交換水75.0gと界面活性剤アクアロンKH-1025[第一工業製薬(株)製;有効成分25%]20.0gと界面活性剤ラテムルPD-104[花王(株)製;有効成分20%]37.5gを入れ、均一に溶解した。そこに、n-ブチルアクリレート231.25g、2-エチルヘキシルアクリレート231.25g、メチルメタクリレート25.0g、アクリル酸1.5g、メタクリル酸11.0g、ラウリルメルカプタン0.2gを加えて乳化し、乳化液(4)632.7gを得た。 (Adjustment Example 4)
<Preparation of emulsion (4)>
In the container, 75.0 g of ion-exchanged water and surfactant Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25%] 20.0 g and surfactant Latemul PD-104 [manufactured by Kao Corp .;
攪拌機、還流冷却管、窒素導入管、温度計、滴下漏斗を備えた反応容器に、イオン交換水340gを入れ、窒素を吹き込みながら60℃まで昇温した。攪拌下、乳化液(4)の一部[3.2g]、過硫酸アンモニウム水溶液5.0g[有効成分3%]、亜硫酸水素ナトリウム水溶液5.0g[有効成分3%]を添加し、60℃を保ちながら1時間で重合させた。引き続き、残りの乳化液(2)629.5gと、過硫酸アンモニウム水溶液40g[有効成分1.25%]を別々の漏斗を使用して、反応容器を60℃に保ちながら8時間かけて滴下重合した。滴下終了後、反応容器を60℃に保ちながら2時間攪拌した後、内容物を冷却し、引き続き、pHが7.5になるようにアンモニア水(有効成分10%)で調製した。これを200メッシュ金網で濾過し、アクリル系共重合体(4)のエマルジョン1013.5gを得た。ここで、得られたアクリル系共重合体(4)のエマルジョンは固形分濃度50%、平均粒子径は345nmであった。 <Preparation of emulsion of acrylic copolymer (4)>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of emulsion (4), 5.0 g ammonium persulfate aqueous solution [3% active ingredient], 5.0 g sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour. Subsequently, 629.5 g of the remaining emulsion (2) and 40 g of an aqueous ammonium persulfate solution (active ingredient 1.25%) were dropped and polymerized using a separate funnel over 8 hours while maintaining the reaction vessel at 60 ° C. . After completion of the dropwise addition, the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (
<乳化液(5)の調製>
容器にイオン交換水75.0gと界面活性剤アクアロンKH-1025[第一工業製薬(株)製;有効成分25%]20.0gと界面活性剤ラテムルPD-104[花王(株)製;有効成分20%]37.5gを入れ、均一に溶解した。そこに、n-ブチルアクリレート240g、2-エチルヘキシルアクリレート240g、N-ビニルピロリドン7.5g、アクリル酸1.5g、メタクリル酸11.0g、ラウリルメルカプタン0.2gを加えて乳化し、乳化液(5)632.7gを得た。 (Adjustment Example 5)
<Preparation of emulsion (5)>
In the container, 75.0 g of ion-exchanged water and surfactant Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25%] 20.0 g and surfactant Latemul PD-104 [manufactured by Kao Corp .;
攪拌機、還流冷却管、窒素導入管、温度計、滴下漏斗を備えた反応容器に、イオン交換水340gを入れ、窒素を吹き込みながら60℃まで昇温した。攪拌下、乳化液(5)の一部[3.2g]、過硫酸アンモニウム水溶液5.0g[有効成分3%]、亜硫酸水素ナトリウム水溶液5.0g[有効成分3%]を添加し、60℃を保ちながら1時間で重合させた。引き続き、残りの乳化液(2)629.5gと、過硫酸アンモニウム水溶液40g[有効成分1.25%]を別々の漏斗を使用して、反応容器を60℃に保ちながら8時間かけて滴下重合した。滴下終了後、反応容器を60℃に保ちながら2時間攪拌した後、内容物を冷却し、引き続き、pHが7.5になるようにアンモニア水(有効成分10%)で調製した。これを200メッシュ金網で濾過し、アクリル系共重合体(5)のエマルジョン1013.5gを得た。ここで、得られたアクリル系共重合体(5)のエマルジョンは固形分濃度50%、平均粒子径は340nmであった。 <Preparation of emulsion of acrylic copolymer (4)>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 340 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part [3.2 g] of the emulsion (5), 5.0 g ammonium persulfate aqueous solution [3% active ingredient], 5.0 g sodium hydrogen sulfite aqueous solution [3% active ingredient] were added, While maintaining, polymerization was carried out in 1 hour. Subsequently, 629.5 g of the remaining emulsion (2) and 40 g of an aqueous ammonium persulfate solution (active ingredient 1.25%) were dropped and polymerized using a separate funnel over 8 hours while maintaining the reaction vessel at 60 ° C. . After completion of the dropwise addition, the reaction vessel was stirred for 2 hours while maintaining the temperature at 60 ° C., and then the contents were cooled, and subsequently prepared with ammonia water (
(製造例1)
前記のアクリル系共重合体(1)のエマルジョン1000g[dry;500g]に、レベリング剤としてサーフィノールPSA-336[エアー・プロダクツ・ジャパン(株)製;有効成分100%]2.5g、消泡剤としてサーフィノールDF-110D[エアー・プロダクツ・ジャパン(株)製;有効成分100%]2.5g、粘着付与樹脂としてスーパーエステルNS-100H[荒川化学工業(株)製;ガラス転移温度50℃]固形分で125g、、架橋剤としてエポキシ化合物テトラッドC[三菱瓦斯化学(株)製]0.15g(0.03質量部)を添加し、200メッシュ金網で濾過し、水分散型アクリル系粘着剤組成物(1)を得た。 [Production of water-dispersed acrylic pressure-sensitive adhesive composition]
(Production Example 1)
1000 g [dry; 500 g] of the above acrylic copolymer (1), Surfynol PSA-336 [produced by Air Products Japan Co., Ltd .; active ingredient 100%] 2.5 g as a leveling agent, antifoaming Surfynol DF-110D [Air Products Japan Co., Ltd .; active ingredient 100%] 2.5 g as an agent, Superester NS-100H [Arakawa Chemical Industries, Ltd .; glass transition temperature 50 ° C. as a tackifier resin ] 125 g in solid content, 0.15 g (0.03 parts by mass) of epoxy compound tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd.] as a cross-linking agent, filtered through a 200-mesh wire mesh, and water-dispersed acrylic adhesive An agent composition (1) was obtained.
製造例1における架橋剤の配合量0.15g(0.03質量部)を、0.2g(0.04質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(2)を製造した。 (Production Example 2)
A water-dispersed acrylic pressure-sensitive adhesive similar to Production Example 1 except that the amount of the crosslinking agent 0.15 g (0.03 parts by mass) in Production Example 1 was changed to 0.2 g (0.04 parts by mass). Composition (2) was produced.
製造例1における架橋剤の配合量0.15g(0.03質量部)を、0.25g(0.05質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(3)を製造した。 (Production Example 3)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 1 except that the amount of the crosslinking agent 0.15 g (0.03 parts by mass) in Production Example 1 was changed to 0.25 g (0.05 parts by mass). A composition (3) was produced.
製造例1において使用した粘着付与樹脂スーパーエステルNS-100H固形分125gに代えて、スーパーエステルE-865NT[荒川化学工業(株)製;ガラス転移温度100℃]を固形分で62.5g、スーパーエステルE-200NT[荒川化学工業(株)製;ガラス転移温度90℃]を固形分で62.5g使用し、架橋剤の配合量0.15g(0.03質量部)を、0.35g(0.07質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(4)を製造した。 (Production Example 4)
Superester E-865NT (manufactured by Arakawa Chemical Industry Co., Ltd .; glass transition temperature 100 ° C.) instead of 125 g of solid content NS-100H solid content of tackifier resin used in Production Example 1 62.5 g of ester E-200NT (manufactured by Arakawa Chemical Industries, Ltd .; glass transition temperature 90 ° C.) was used as the solid content, and 0.15 g (0.03 parts by mass) of the crosslinking agent was added to 0.35 g (0.03 parts by mass). A water-dispersed acrylic pressure-sensitive adhesive composition (4) was produced in the same manner as in Production Example 1 except that the amount was 0.07 parts by mass).
製造例3において使用したアクリル系共重合体(1)のエマルジョン1000g[dry;500g]に代えて、前記のアクリル系共重合体(2)を使用した以外は、製造例3と同様にして、水分散型アクリル系粘着剤組成物(5)を製造した。 (Production Example 5)
Instead of the acrylic copolymer (1) emulsion 1000 g [dry; 500 g] used in Production Example 3, the same procedure as in Production Example 3 was used except that the acrylic copolymer (2) was used. A water-dispersed acrylic pressure-sensitive adhesive composition (5) was produced.
製造例5における架橋剤の配合量0.25g(0.05質量部)を、0.4g(0.08質量部)とした以外は、製造例5と同様にして水分散型アクリル系粘着剤組成物(6)を製造した。 (Production Example 6)
Water-dispersed acrylic pressure-sensitive adhesive as in Production Example 5 except that the amount of the crosslinking agent in Production Example 5 was changed to 0.25 g (0.05 parts by mass) and 0.4 g (0.08 parts by mass). A composition (6) was produced.
製造例6において使用したアクリル系共重合体(2)のエマルジョン1000g[dry;500g]に代えて、前記のアクリル系共重合体(3)を使用した以外は、製造例6と同様にして、水分散型アクリル系粘着剤組成物(7)を製造した。 (Production Example 7)
In the same manner as in Production Example 6 except that the acrylic copolymer (3) was used in place of the 1000 g [dry; 500 g] emulsion of the acrylic copolymer (2) used in Production Example 6, A water-dispersed acrylic pressure-sensitive adhesive composition (7) was produced.
製造例7における架橋剤の配合量0.4g(0.08質量部)を、0.5g(0.1質量部)とした以外は、製造例7と同様にして水分散型アクリル系粘着剤組成物(8)を製造した。 (Production Example 8)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 7, except that the amount of the crosslinking agent in Production Example 7 was changed to 0.4 g (0.08 parts by mass) from 0.5 g (0.1 parts by mass). A composition (8) was produced.
製造例1において使用した粘着付与樹脂スーパーエステルNS-100H固形分125gに代えて、スーパーエステルE-200NT[荒川化学工業(株)製;ガラス転移温度90℃]を固形分で125g使用し、架橋剤の配合量0.15g(0.03質量部)を、0.35g(0.07質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(9)を製造した。 (Production Example 9)
Instead of 125 g of the tackifier resin superester NS-100H solid content used in Production Example 1, 125 g of superester E-200NT (manufactured by Arakawa Chemical Industry Co., Ltd .; glass transition temperature 90 ° C.) was used in the solid content for crosslinking. A water-dispersed acrylic pressure-sensitive adhesive composition (9) in the same manner as in Production Example 1, except that 0.15 g (0.03 parts by mass) of the agent was changed to 0.35 g (0.07 parts by mass). Manufactured.
製造例1において使用した粘着付与樹脂スーパーエステルNS-100H固形分125gに代えて、スーパーエステルE-865NT[荒川化学工業(株)製;ガラス転移温度100℃]を固形分で125g使用し、架橋剤の配合量0.15g(0.03質量部)を、0.35g(0.07質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(10)を製造した。 (Production Example 10)
Instead of 125 g of the tackifier resin superester NS-100H solid content used in Production Example 1, 125 g of superester E-865NT (manufactured by Arakawa Chemical Industry Co., Ltd .; glass transition temperature 100 ° C.) was used in the solid content for crosslinking. Water-dispersed acrylic pressure-sensitive adhesive composition (10) in the same manner as in Production Example 1, except that 0.15 g (0.03 parts by mass) of the agent was changed to 0.35 g (0.07 parts by mass). Manufactured.
製造例1において使用した粘着付与樹脂スーパーエステルNS-100H固形分125gに代えて、50g使用し、架橋剤の配合量0.15g(0.03質量部)を、0.35g(0.07質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(11)を製造した。 (Production Example 11)
Instead of the tackifier resin superester NS-100H solid content of 125 g used in Production Example 1, 50 g was used, and 0.15 g (0.03 parts by mass) of the crosslinking agent was added to 0.35 g (0.07 parts by mass). A water-dispersed acrylic pressure-sensitive adhesive composition (11) was produced in the same manner as in Production Example 1 except that the composition was changed to (Part).
製造例1において使用した粘着付与樹脂スーパーエステルNS-100H固形分125gに代えて、200g使用し、架橋剤の配合量0.15g(0.03質量部)を、0.5g(0.1質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(12)を製造した。 (Production Example 12)
Instead of the tackifier resin superester NS-100H solid content of 125 g used in Production Example 1, 200 g was used, and 0.15 g (0.03 parts by mass) of the crosslinking agent was added to 0.5 g (0.1 parts by mass). A water-dispersed acrylic pressure-sensitive adhesive composition (12) was produced in the same manner as in Production Example 1 except that the composition was changed to (Part).
製造例4において使用したアクリル系共重合体(1)のエマルジョン1000g[dry;500g]に代えて、前記のアクリル系共重合体(4)を使用した以外は、製造例4と同様にして、水分散型アクリル系粘着剤組成物(13)を製造した。 (Production Example 13)
Instead of the acrylic copolymer (1) emulsion 1000 g [dry; 500 g] used in Production Example 4, the same procedure as in Production Example 4 was used, except that the acrylic copolymer (4) was used. A water-dispersed acrylic pressure-sensitive adhesive composition (13) was produced.
製造例4において使用したアクリル系共重合体(1)のエマルジョン1000g[dry;500g]に代えて、前記のアクリル系共重合体(5)を使用した以外は、製造例4と同様にして、水分散型アクリル系粘着剤組成物(14)を製造した。 (Production Example 14)
Instead of the acrylic copolymer (1) emulsion 1000 g [dry; 500 g] used in Production Example 4, the same procedure as in Production Example 4 was used, except that the acrylic copolymer (5) was used. A water-dispersed acrylic pressure-sensitive adhesive composition (14) was produced.
製造例4における架橋剤の配合量0.35g(0.07質量部)を、0.15g(0.03質量部)とした以外は、製造例4と同様にして水分散型アクリル系粘着剤組成物(H1)を製造した。 (Comparative Production Example 1)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 4 except that the amount of the crosslinking agent in Production Example 4 was changed to 0.35 g (0.07 parts by mass) and 0.15 g (0.03 parts by mass). A composition (H1) was produced.
製造例1における架橋剤の配合量0.15g(0.03質量部)を、0.4g(0.08質量部)とした以外は、製造例1と同様にして水分散型アクリル系粘着剤組成物(H2)を製造した。 (Comparative Production Example 2)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 1 except that the amount of the crosslinking agent 0.15 g (0.03 parts by mass) in Production Example 1 was changed to 0.4 g (0.08 parts by mass). A composition (H2) was produced.
製造例5における架橋剤の配合量0.25g(0.05質量部)を、0.15g(0.03質量部)とした以外は、製造例5と同様にして水分散型アクリル系粘着剤組成物(H3)を製造した。 (Comparative Production Example 3)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 5 except that the amount of the crosslinking agent in Production Example 5 was changed to 0.25 g (0.05 parts by mass) and 0.15 g (0.03 parts by mass). A composition (H3) was produced.
製造例5における架橋剤の配合量0.25g(0.05質量部)を、0.2g(0.04質量部)とした以外は、製造例5と同様にして水分散型アクリル系粘着剤組成物(H4)を製造した。 (Comparative Production Example 4)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 5 except that the amount of the crosslinking agent in Production Example 5 was changed to 0.25 g (0.05 parts by mass). A composition (H4) was produced.
製造例5における架橋剤の配合量0.25g(0.05質量部)を、0.5g(0.1質量部)とした以外は、製造例5と同様にして水分散型アクリル系粘着剤組成物(H5)を製造した。 (Comparative Production Example 5)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 5, except that the amount of the crosslinking agent in Production Example 5 was changed to 0.25 g (0.05 parts by mass) and 0.5 g (0.1 parts by mass). A composition (H5) was produced.
製造例7における架橋剤の配合量0.4g(0.08質量部)を、0.6g(0.03質量部)とした以外は、製造例7と同様にして水分散型アクリル系粘着剤組成物(H6)を製造した。 (Comparative Production Example 6)
A water-dispersed acrylic pressure-sensitive adhesive as in Production Example 7 except that the amount of the crosslinking agent in Production Example 7 was changed to 0.4 g (0.08 parts by mass) from 0.6 g (0.03 parts by mass). A composition (H6) was produced.
(実施例1)
製造例1で得た水分散型アクリル系粘着剤組成物(1)を、離型処理した厚さ75μmのポリエステルフィルム上に、乾燥後の厚さが20μmとなるよう塗工して、85℃で2分間乾燥して粘着剤層を得た。得られた粘着剤層をインキコートフィルム(A)の両面に、転写し、80℃の熱ロールで4kgf/cmの圧力でラミネートし、さらに、40℃で2日間養生して、実施例1の両面粘着テープを得た。 [Production of adhesive tape]
Example 1
The water-dispersed acrylic pressure-sensitive adhesive composition (1) obtained in Production Example 1 was coated on a 75 μm-thick polyester film subjected to a release treatment so that the thickness after drying was 20 μm, and 85 ° C. And dried for 2 minutes to obtain an adhesive layer. The obtained pressure-sensitive adhesive layer was transferred to both sides of the ink coat film (A), laminated with a heat roll of 80 ° C. at a pressure of 4 kgf / cm, and further cured at 40 ° C. for 2 days. A double-sided adhesive tape was obtained.
製造例2~14で得た水分散型アクリル系粘着剤組成物(2)~(14)を使用した以外は、実施例1と同様にして、実施例2~14の両面粘着テープを得た。 (Examples 2 to 14)
Double-sided pressure-sensitive adhesive tapes of Examples 2 to 14 were obtained in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive compositions (2) to (14) obtained in Production Examples 2 to 14 were used. .
比較製造例1~6で得た水分散型アクリル系粘着剤組成物(H1)~(H6)を使用した以外は、上記実施例1と同様にして、比較例1~6の両面粘着テープを得た。 (Comparative Examples 1 to 6)
The double-sided pressure-sensitive adhesive tapes of Comparative Examples 1 to 6 were prepared in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive compositions (H1) to (H6) obtained in Comparative Production Examples 1 to 6 were used. Obtained.
アクリル系共重合体のエマルジョンを用いて、上記粘着テープの製造条件に準じてシートを作成し、5mm厚みまで重ね合わせて試験片を作製した。粘弾性試験機(レオメトリックス社製、商品名:アレス2KFRTN1)を用いて、同試験機の測定部である平行円盤の間に試験片を挟み込み、周波数1Hz、昇温速度2℃/minで-50℃から150℃までの貯蔵弾性率(G’)と損失弾性率(G’’)を測定し、以下の式に基づきtanδを算出してガラス転移温度とした。 (Measurement of glass transition temperature of acrylic copolymer)
Using an acrylic copolymer emulsion, a sheet was prepared in accordance with the production conditions of the adhesive tape, and a test piece was prepared by superimposing the sheet to a thickness of 5 mm. Using a viscoelasticity tester (trade name: Ares 2KFRTN1 manufactured by Rheometrix Co., Ltd.), a test piece is sandwiched between parallel disks that are measuring units of the tester, and the frequency is 1 Hz and the heating rate is 2 ° C./min. The storage elastic modulus (G ′) and loss elastic modulus (G ″) from 50 ° C. to 150 ° C. were measured, and tan δ was calculated based on the following formula to obtain the glass transition temperature.
粘着付与樹脂を真空乾燥器を用いて真空下、60℃、2日間以上乾燥させて、乾燥重量10mgの試験試料を得た。当該試験試料を、DSC測定装置(メトラー・トレド(株)製、商品名:DSC822)を用いて、-50℃から200℃の温度範囲で、昇温速度2℃/minで連続2回DSC曲線を測定し、2回目の測定データからガラス転移温度を測定した。 (Measurement of glass transition temperature of tackifying resin)
The tackifying resin was dried at 60 ° C. for 2 days or more under vacuum using a vacuum dryer to obtain a test sample having a dry weight of 10 mg. Using the DSC measuring device (trade name: DSC822, manufactured by METTLER TOLEDO Co., Ltd.), the test sample was measured twice continuously in a temperature range of −50 ° C. to 200 ° C. at a temperature rising rate of 2 ° C./min. And the glass transition temperature was measured from the second measurement data.
上記粘着テープの製造条件に準じて作成した粘着剤層を、5mm厚みまで重ね合わせて試験片を作製した。粘弾性試験機(レオメトリックス社製、商品名:アレス2KFRTN1)を用いて、同試験機の測定部である平行円盤の間に試験片を挟み込み、周波数1Hz、昇温速度2℃/minで-50℃から150℃までの貯蔵弾性率(G’)と損失弾性率(G’’)を測定し、以下の式に基づきtanδを算出してガラス転移温度とした。
tanδ=G’’/G’ (Measurement of glass transition temperature of adhesive layer)
A pressure-sensitive adhesive layer prepared according to the production conditions for the pressure-sensitive adhesive tape was laminated to a thickness of 5 mm to prepare a test piece. Using a viscoelasticity tester (trade name: Ares 2KFRTN1 manufactured by Rheometrix Co., Ltd.), a test piece is sandwiched between parallel disks that are measuring units of the tester, and the frequency is 1 Hz and the heating rate is 2 ° C./min. The storage elastic modulus (G ′) and loss elastic modulus (G ″) from 50 ° C. to 150 ° C. were measured, and tan δ was calculated based on the following formula to obtain the glass transition temperature.
tan δ = G ″ / G ′
上記粘着テープの製造条件に準じて、乾燥後の厚みが25μmになるように、ポリエステルフィルム(剥離処理したもの)の上に設けて試験片を調製した。試験片を20mm×100mmの大きさに切断し、ポリエステルフィルムを剥がして、トルエン抽出前の重量aを測定した。次に、同一試験片をトルエン中に24時間浸漬後、ゲル物を取り出し、100℃で2時間乾燥し、トルエン抽出後の重量bを測定した。ゲル分率は、以下の計算式より算出した。
ゲル分率(%)=(b/a)×100 (Measurement of gel fraction of adhesive layer)
According to the manufacturing conditions of the said adhesive tape, it provided on the polyester film (what was peel-processed) so that the thickness after drying might be set to 25 micrometers, and prepared the test piece. The test piece was cut into a size of 20 mm × 100 mm, the polyester film was peeled off, and the weight a before toluene extraction was measured. Next, after the same test piece was immersed in toluene for 24 hours, the gel was taken out and dried at 100 ° C. for 2 hours, and the weight b after toluene extraction was measured. The gel fraction was calculated from the following formula.
Gel fraction (%) = (b / a) × 100
上記にて調製した粘着テープを23℃下で図1のように額縁状に打ち抜き加工した粘着テープ(外形:32mm×42mm、幅:2mm)の黒色インキ側をガラスに貼付し、白色インキ側を3M社製の薄型光学フィルム「BEFRP2RC」(120μm)(外形:30mm×40mm、85℃の乾燥器中に5分間静置した際の外形変化率/流れ方向:+0.08%,幅方向:-0.08%)に貼付した(図1)。なお、粘着テープと光学フィルムが接する幅は各辺とも1mmとした。この部品を85℃に72時間静置し、その後23℃に1時間静置して、85℃静置前後での外観変化を観察した。
○:光学フィルムに歪みが発生しなかった
△:光学フィルムに歪みが発生した
×:光学フィルムに大きな歪みが発生した (Waviness / distortion test of optical film)
The black ink side of the pressure-sensitive adhesive tape (outer shape: 32 mm × 42 mm, width: 2 mm) obtained by punching the pressure-sensitive adhesive tape prepared above into a frame shape as shown in FIG. Thin optical film “BEFRP2RC” (120 μm) manufactured by 3M Co., Ltd. (external shape: 30 mm × 40 mm, external shape change rate when left in a dryer at 85 ° C. for 5 minutes / flow direction: + 0.08%, width direction: − 0.08%) (FIG. 1). In addition, the width | variety with which an adhesive tape and an optical film contact | connected was 1 mm on each side. This part was left to stand at 85 ° C. for 72 hours, and then left to stand at 23 ° C. for 1 hour.
○: No distortion occurred in the optical film Δ: Distortion occurred in the optical film ×: Large distortion occurred in the optical film
図2のように100μmのPETフィルム(ユニチカ製エンブレットSA#100)と2mm厚さのポリカーボネート(PC)板を3mm幅のテープで貼付する。その後、2kgローラー1往復の条件で加圧し、60℃90%RH72時間放置後の浮きはがれを観察する。0.5mm以上の浮きが発生した場合は厚み較差が厳しい液晶モジュール固定用テープには適さない。
○:浮き剥がれが0.5mm未満
×:浮き剥がれが0.5mm以上 (Repulsion resistance test)
As shown in FIG. 2, a 100 μm PET film (Unite Emblet SA # 100) and a 2 mm thick polycarbonate (PC) plate are attached with a 3 mm wide tape. Then, pressurization is performed under the condition of one reciprocation of the 2 kg roller, and the floating peeling after observing at 60 ° C. and 90% RH for 72 hours is observed. When the float of 0.5 mm or more occurs, it is not suitable for a liquid crystal module fixing tape having a severe thickness difference.
○: Floating peeling is less than 0.5 mm ×: Floating peeling is 0.5 mm or more
11:光学フィルム
12:ガラス
20:粘着テープ
21:PC板
22:PETフィルム
23:両面テープ 10: Double-sided adhesive tape 11: Optical film 12: Glass 20: Adhesive tape 21: PC board 22: PET film 23: Double-sided tape
Claims (5)
- 光学フィルムの固定に使用する粘着テープであって、
光学フィルムと接する粘着剤層が、水分散型アクリル系粘着剤組成物からなる粘着剤層であり、
前記粘着剤層のガラス転移温度が-5℃以下であり、ゲル分率が25~45%であることを特徴とする粘着テープ。 An adhesive tape used for fixing an optical film,
The pressure-sensitive adhesive layer in contact with the optical film is a pressure-sensitive adhesive layer made of a water-dispersed acrylic pressure-sensitive adhesive composition,
A pressure-sensitive adhesive tape, wherein the pressure-sensitive adhesive layer has a glass transition temperature of −5 ° C. or lower and a gel fraction of 25 to 45%. - 前記水分散型アクリル系粘着剤組成物が、ガラス転移温度が-45~-25℃のアクリル系共重合体と、ガラス転移温度が30~120℃の粘着付与樹脂とを含有する請求項1に記載の粘着テープ。 2. The water-dispersed acrylic pressure-sensitive adhesive composition contains an acrylic copolymer having a glass transition temperature of −45 to −25 ° C. and a tackifying resin having a glass transition temperature of 30 to 120 ° C. The adhesive tape as described.
- 前記アクリル系共重合体100質量部に対する粘着付与樹脂の含有量が10~40質量部である請求項1又は2に記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1 or 2, wherein the content of the tackifying resin with respect to 100 parts by mass of the acrylic copolymer is 10 to 40 parts by mass.
- 前記アクリル系共重合体が、2-エチルヘキシルアクリレートをアクリル共重合体に使用するモノマー成分中の40質量%以上含有する請求項1~3のいずれかに記載の粘着テープ。 The pressure-sensitive adhesive tape according to any one of claims 1 to 3, wherein the acrylic copolymer contains 40% by mass or more of 2-ethylhexyl acrylate in a monomer component used for the acrylic copolymer.
- 前記光学フィルムがプリズムシートである請求項1~4のいずれかに記載の粘着テープ。 The pressure-sensitive adhesive tape according to any one of claims 1 to 4, wherein the optical film is a prism sheet.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201280048113.8A CN103842462B (en) | 2011-09-30 | 2012-09-28 | Self adhesive tape |
JP2013534107A JP5541552B2 (en) | 2011-09-30 | 2012-09-28 | Adhesive tape |
KR1020147009139A KR101917906B1 (en) | 2011-09-30 | 2012-09-28 | Adhesive tape |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-216926 | 2011-09-30 | ||
JP2011216926 | 2011-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013047764A1 true WO2013047764A1 (en) | 2013-04-04 |
Family
ID=47995787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/075112 WO2013047764A1 (en) | 2011-09-30 | 2012-09-28 | Adhesive tape |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP5541552B2 (en) |
KR (1) | KR101917906B1 (en) |
CN (1) | CN103842462B (en) |
TW (1) | TWI627254B (en) |
WO (1) | WO2013047764A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014177573A (en) * | 2013-03-15 | 2014-09-25 | Dic Corp | Pressure-sensitive adhesive tape |
JP2020094224A (en) * | 2014-01-15 | 2020-06-18 | 日東電工株式会社 | Double-sided adhesive sheet |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101657356B1 (en) * | 2013-09-30 | 2016-09-19 | 주식회사 엘지화학 | Opticla film including coated functional layer, polarizing plate and image display device comprising the same |
KR102312515B1 (en) * | 2014-11-25 | 2021-10-13 | 엘지디스플레이 주식회사 | Organic light emitting diode display |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002309212A (en) * | 2001-04-18 | 2002-10-23 | Nitto Denko Corp | Aqueous-dispersion-type pressure-sensitive adhesive sheet for glass plate, pressure-sensitive adhesive optical film, and liquid crystal display |
JP2005082634A (en) * | 2003-09-04 | 2005-03-31 | Soken Chem & Eng Co Ltd | Functional adhesive sheet and flat panel-type display device |
WO2008111412A1 (en) * | 2007-03-09 | 2008-09-18 | Sekisui Chemical Co., Ltd. | Adhesive, double-sided adhesive sheet and display |
JP2008274243A (en) * | 2007-03-30 | 2008-11-13 | Dic Corp | Adhesive tape and lcd module |
JP2010065095A (en) * | 2008-09-09 | 2010-03-25 | Sekisui Chem Co Ltd | Self-adhesive, double-sided pressure-sensitive adhesive sheet, and display |
JP2011213788A (en) * | 2010-03-31 | 2011-10-27 | Dic Corp | Emulsion-type pressure-sensitive adhesive composition and pressure-sensitive adhesive tape |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3134347B2 (en) * | 1990-08-10 | 2001-02-13 | 日本合成化学工業株式会社 | Acrylic acid decyl ester composition |
JP2007051271A (en) * | 2005-07-21 | 2007-03-01 | Nitto Denko Corp | Adhesive composition, pressure sensitive adhesive double coated tape, adhesion method and portable electronic device |
CN101981150B (en) | 2008-03-28 | 2013-05-01 | Dic株式会社 | Aqueous dispersion type acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive tape |
JP5519917B2 (en) * | 2008-09-26 | 2014-06-11 | 積水化学工業株式会社 | Double-sided adhesive tape for fixing abrasive cloth |
JP5578835B2 (en) * | 2009-11-16 | 2014-08-27 | 日東電工株式会社 | Adhesive tape |
-
2012
- 2012-09-27 TW TW101135501A patent/TWI627254B/en active
- 2012-09-28 JP JP2013534107A patent/JP5541552B2/en active Active
- 2012-09-28 CN CN201280048113.8A patent/CN103842462B/en active Active
- 2012-09-28 KR KR1020147009139A patent/KR101917906B1/en active IP Right Grant
- 2012-09-28 WO PCT/JP2012/075112 patent/WO2013047764A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002309212A (en) * | 2001-04-18 | 2002-10-23 | Nitto Denko Corp | Aqueous-dispersion-type pressure-sensitive adhesive sheet for glass plate, pressure-sensitive adhesive optical film, and liquid crystal display |
JP2005082634A (en) * | 2003-09-04 | 2005-03-31 | Soken Chem & Eng Co Ltd | Functional adhesive sheet and flat panel-type display device |
WO2008111412A1 (en) * | 2007-03-09 | 2008-09-18 | Sekisui Chemical Co., Ltd. | Adhesive, double-sided adhesive sheet and display |
JP2008274243A (en) * | 2007-03-30 | 2008-11-13 | Dic Corp | Adhesive tape and lcd module |
JP2010065095A (en) * | 2008-09-09 | 2010-03-25 | Sekisui Chem Co Ltd | Self-adhesive, double-sided pressure-sensitive adhesive sheet, and display |
JP2011213788A (en) * | 2010-03-31 | 2011-10-27 | Dic Corp | Emulsion-type pressure-sensitive adhesive composition and pressure-sensitive adhesive tape |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014177573A (en) * | 2013-03-15 | 2014-09-25 | Dic Corp | Pressure-sensitive adhesive tape |
JP2020094224A (en) * | 2014-01-15 | 2020-06-18 | 日東電工株式会社 | Double-sided adhesive sheet |
Also Published As
Publication number | Publication date |
---|---|
CN103842462A (en) | 2014-06-04 |
JP5541552B2 (en) | 2014-07-09 |
KR20140075705A (en) | 2014-06-19 |
JPWO2013047764A1 (en) | 2015-03-30 |
CN103842462B (en) | 2016-03-30 |
TWI627254B (en) | 2018-06-21 |
TW201323567A (en) | 2013-06-16 |
KR101917906B1 (en) | 2018-11-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5760571B2 (en) | Colored adhesive tape for fixing polarizing film | |
JP5760572B2 (en) | Double-sided adhesive tape | |
JP5311108B2 (en) | Light-shielding adhesive tape and LCD module using the same | |
JP5277553B2 (en) | Image display module for electronic terminal and pressure sensitive adhesive sheet | |
JP5896208B2 (en) | Colored film and colored adhesive tape | |
JP5891663B2 (en) | Colored adhesive tape | |
JP5760570B2 (en) | Colored adhesive tape for fixing glass panels | |
JP5970821B2 (en) | Colored film and colored adhesive tape | |
JP2008248226A (en) | Adhesive tape and lcd module | |
JP6945091B1 (en) | Adhesive sheet, display device, structure and adhesive sheet with light transmissive member | |
JP5541552B2 (en) | Adhesive tape | |
JP2008247960A (en) | Light-shielding adhesive tape and lcd module produced by using the same | |
JP5760573B2 (en) | Double-sided adhesive tape | |
JP5760574B2 (en) | Colored adhesive tape | |
JP5545513B2 (en) | Adhesive tape and LCD module | |
JP5590380B2 (en) | Emulsion type adhesive composition and adhesive tape | |
KR20180092802A (en) | Adhesive and adhesive sheet | |
TWI729798B (en) | (meth)acrylate adhesive composition | |
JP2010190950A (en) | Light shielding reflective tape and lcd module | |
JP6094664B2 (en) | Colored film and colored adhesive tape | |
JP7116229B2 (en) | Adhesive layer and adhesive film | |
JP7303355B2 (en) | Adhesive film and polarizing plate with adhesive layer | |
JP2013199579A (en) | Acrylic adhesive, adhesive for optical member, optical member with adhesive layer using the same, image display device, method of producing acrylic adhesive, and acrylic adhesive composition | |
WO2022168714A1 (en) | Adhesive agent, adhesive sheet, optical film provided with adhesive agent, and optical laminate | |
JP6884258B1 (en) | Adhesive sheet |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201280048113.8 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12834848 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2013534107 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20147009139 Country of ref document: KR Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12834848 Country of ref document: EP Kind code of ref document: A1 |