WO2012070791A2 - 양면 점착 시트 및 이를 포함하는 터치 패널 표시장치 - Google Patents
양면 점착 시트 및 이를 포함하는 터치 패널 표시장치 Download PDFInfo
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- WO2012070791A2 WO2012070791A2 PCT/KR2011/008601 KR2011008601W WO2012070791A2 WO 2012070791 A2 WO2012070791 A2 WO 2012070791A2 KR 2011008601 W KR2011008601 W KR 2011008601W WO 2012070791 A2 WO2012070791 A2 WO 2012070791A2
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- double
- adhesive layer
- pressure
- adhesive sheet
- sensitive adhesive
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
- C09J2301/1242—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- 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
- C09J2433/006—Presence of (meth)acrylic polymer in the substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
- Y10T428/24959—Thickness [relative or absolute] of adhesive layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2843—Web or sheet containing structurally defined element or component and having an adhesive outermost layer including a primer layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2848—Three or more layers
Definitions
- Embodiments of the present invention relate to a double-sided adhesive sheet and a touch panel display device including the same.
- the touch panel is used in various office equipment such as a computer, a word processor or a personal information terminal, and is used as an input means for data, and as the concept of the user interface is enhanced, it is an indispensable element in various electronic devices.
- integrating with a display device for displaying data enables intuitive operation.
- the touch panel method there are various methods such as a resistive film method, an optical method, a capacitive method, and an ultrasonic method, and a resistive method and a capacitive method are generally used.
- the touch panel is adhesively fixed to the display device module through a pressure-sensitive adhesive layer formed in a frame shape at the edge of the display device module.
- 1 is a schematic cross-sectional view illustrating an example of a conventional touch panel display device.
- the touch panel 11 is coupled to the display device module 13 through a pressure-sensitive adhesive layer 12 to display a touch panel.
- the air layer 14 exists between the touch panel 11 and the display device module 13, which causes a problem in that visibility due to an increase in reflectance is degraded.
- the visibility of the display device can be improved, while the rework of the upper touch panel and the lower display device module is excellent, so that a recyclable means is required.
- the problem to be solved by the embodiments of the present invention is to provide a double-sided adhesive sheet.
- Another object of embodiments of the present invention is to provide a touch panel display device having the double-sided adhesive sheet.
- Another problem to be solved by the embodiments of the present invention is to provide a method of fixing the touch panel to the display device module by using the double-sided adhesive sheet.
- Aspect according to one embodiment of the present invention is a double-sided adhesive sheet sequentially comprising a first pressure-sensitive adhesive layer, a transparent acrylic resin layer and a second pressure-sensitive adhesive layer, wherein each of the first adhesive layer and the second adhesive layer is an acrylic pressure-sensitive adhesive Wherein the first adhesive layer is in contact with the touch panel, the second adhesive layer is in contact with the display device module, and the adhesive force between the first adhesive layer and the touch panel is between the second adhesive layer and the display device module. It is related with the double-sided adhesive sheet characterized by larger than the adhesive force of.
- a touch panel display device including the double-sided pressure-sensitive adhesive sheet, wherein the first pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet is adhered to the entire surface of the touch panel, and the second pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet is provided.
- a double-sided adhesive sheet is attached to the front surface of the display device module, and the double-sided adhesive sheet relates to a touch panel display device that is peelable and re-adhesive to the touch panel or the display device module.
- the double-sided pressure-sensitive adhesive sheet 20 according to one embodiment of the present invention sequentially includes a first pressure-sensitive adhesive layer 21, a transparent acrylic resin layer 22, and a second pressure-sensitive adhesive layer 23.
- the first pressure sensitive adhesive layer 21 is in contact with the touch panel, and the second pressure sensitive adhesive layer 23 is in contact with the display device module.
- the double-sided adhesive sheet 20 polarizes a touch panel having a lower substrate made of an inorganic or organic material such as polycarbonate, polymethylmethacrylate, glass, or SUS. It may be used in the case of attaching and fixing the display module having a film, but is not limited thereto.
- the double-sided adhesive sheet 20 is coated with a pressure-sensitive adhesive having different peeling strengths on both surfaces of the transparent acrylic resin layer 22, and the adhesive force between the first adhesive layer and the touch panel has the second adhesive layer and the display device module. It is characterized by greater than the adhesive force therebetween.
- the first pressure-sensitive adhesive layer 21 has a 180 ° peeling force of 800 to 3000 g / in with respect to the substrate at a peel rate of 300 mm / min and a temperature of 23 ° C.
- the 180 ° peeling force of the first pressure-sensitive adhesive layer 21 is less than 800 g / in, reworkability and durability are decreased, and when it is more than 3000 g / in, the residue is likely to remain.
- the second pressure-sensitive adhesive layer 23 is 180 ° peeled to an acrylate resin such as a polarizing film such as triacetyl cellulose (TAC), cyclopolyolefin, polymethyl methacrylate at a peeling rate of 300 mm / min and a temperature of 23 ° C. It is characterized in that the force is from 0 to 80g / in, when the 180 ° peeling force of the second pressure-sensitive adhesive layer 23 exceeds 80 g / in is not easy to rework, even if the 180 ° peeling force is 0 Rework is possible if a tack (sticky) due to phosphorus contact exists and is in contact.
- TAC triacetyl cellulose
- the double-sided adhesive sheet 20 includes a transparent acrylic resin layer 22 as a base film.
- a transparent acrylic resin layer 22 as a base film.
- the base layer 22 and the upper and lower pressure-sensitive adhesive layers 21 and 23 are all made of acrylic material to eliminate the difference in refractive index, thereby reducing the refractive index between the different layers. This is to improve the visibility burnout caused by the difference.
- the refractive indices of the first pressure sensitive adhesive layer, the transparent acrylic resin layer, and the second pressure sensitive adhesive layer are different, optical performance is lowered and distortion occurs, so that the effect of improving visibility is not obtained. Therefore, it is advantageous that the first and second pressure sensitive adhesive layers and the transparent acrylic pressure sensitive adhesive resin layer have similar refractive indices. More specifically, the refractive index of the first adhesive layer, the transparent acrylic resin layer and the second adhesive layer may be 1.44 to 1.55.
- Resins usable in the transparent acrylic resin layer 22 as described above include methyl methacrylate, urethane acrylate, epoxy acrylate, silicone acrylate, ethylhexyl acrylate, butyl acrylate, ethyl acrylate and isobornyl acrylate.
- polymerized polymers It is possible to mix and use in the form of a monomer, or to mix and use a polymerized polymer with a solvent, and if it is an acrylic resin which has transparency which does not impair the visibility of a display apparatus, it can select suitably.
- Both the first pressure sensitive adhesive layer 21 and the second pressure sensitive adhesive layer 23 may use acrylic pressure sensitive adhesives, and those having transparency that does not impair visibility of the display device are used.
- the acrylic pressure-sensitive adhesive forming the first adhesive layer 21 is a functional group in an amount of 5 to 30% by weight based on the acrylate monomer having 1 to 12 carbon atoms of the alkyl group in terms of securing durability and adhesive performance. It is characterized by containing a copolymerizable monomer.
- the functional group-containing copolymerizable monomer is less than 5% by weight, the peeling force is lowered.
- the functional group-containing copolymerizable monomer is more than 30% by weight, the pressure-sensitive adhesive is too hard and the step difference absorbing performance is lowered when a printing step exists.
- the acrylic pressure-sensitive adhesive to form the second adhesive layer 22 is a functional group in an amount of 1 to 5% by weight relative to the acrylate monomer having 1 to 12 carbon atoms of the alkyl group in terms of securing the effect of rework and controlling the degree of crosslinking. It is characterized by containing a copolymerizable monomer.
- the functional group-containing copolymerizable monomer is less than 1%, cohesion is hardly present, and thus a residue is likely to remain during rework.
- the functional group-containing copolymerizable monomer is less than 5%, a peeling force is increased to increase the rework performance.
- the acrylic pressure-sensitive adhesive forming the first adhesive layer and the second adhesive layer By limiting the composition of the acrylic pressure-sensitive adhesive forming the first adhesive layer and the second adhesive layer as described above, it can have a range of refractive index. This can minimize the difference between the refractive index and the transparent acrylic resin layer within the same range as the refractive index with the transparent acrylic resin layer. More specifically, despite the laminated structure of the first adhesive layer, the transparent acrylic resin layer and the second adhesive layer, the difference in refractive index is minimized, thereby exhibiting the same effect as one layer, and can correct the optical distortion phenomenon.
- Examples of the acrylate monomer having 1 to 12 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and butyl (meth) acrylate.
- Isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl ( Meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate and dodecyl (meth) Acrylates are included.
- One selected from the above examples may be used or two or more kinds thereof may be used in combination.
- a monomer component that is, a copolymerizable monomer having copolymerizability with respect to an acrylate monomer having 1 to 12 carbon atoms of an alkyl group
- a monomer for modification of an acrylic adhesive As such a monomer for modification, any of various monomers known as the monomer for modification of an acrylic adhesive can be used, for example.
- the copolymerizable monomers may be used alone or in combination of two or more thereof.
- examples of the copolymerizable monomer include copolymerizable monomers having various kinds of functional groups (functional group-containing copolymerizable monomers); Styrene monomers such as styrene; And ⁇ -olefin based monomers such as ethylene and propylene.
- Examples of functional group-containing copolymerizable monomers include vinyl esters such as vinyl acetate; Cyano group-containing copolymerizable monomers such as (meth) acrylonitrile; Amide group-containing copolymerizable monomers such as (meth) acrylamide or N, N-dimethyl (meth) acrylamide; Hydroxyl group-containing air such as 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxy butyl (meth) acrylate or 6-hydroxyhexyl (meth) acrylate Synthetic monomers; Epoxy group-containing copolymerizable monomers such as glycidyl (meth) acrylate; Amino group-containing copolymerizable monomers such as N, N-dimethylaminoethyl (meth) acrylic acid alkyl ester; And carboxyl group-containing copolymerizable monomers such as (meth) acrylic acid, crot
- any of the functional group-containing copolymerizable monomers can be used.
- a hydroxyl group-containing copolymerizable monomer or a carboxyl group-containing copolymerizable monomer can be preferably used.
- acrylic acid can be used preferably.
- the acrylic polymer can be crosslinked using a functional group (especially a polar group) derived from the monomer for modification.
- the thickness of the first pressure-sensitive adhesive layer 21 is the second pressure-sensitive adhesive. It is preferred to be thicker than the thickness of layer 23.
- the relatively thick first pressure sensitive adhesive layer 21 does not use a solvent-forming composition. Can be prepared in a solvent-free form. This is because when the pressure-sensitive adhesive layer is manufactured using a solvent, it is difficult to manufacture the pressure-sensitive adhesive layer having a predetermined thickness or more while implementing the physical properties of the first pressure-sensitive adhesive layer 21.
- the thermal initiator becomes a free radical and the polymerization proceeds, inducing partial polymerization.
- oxygen bubbling is induced and a polymerization inhibitor is added to terminate the reaction.
- a photoinitiator and a photocuring agent are mixed with the partially polymerized resin as described above, coated on a substrate, and then photocured to prepare an adhesive layer having a desired thickness.
- the manufacturing method of the second pressure-sensitive adhesive layer is prepared using a solvent-type pressure-sensitive adhesive to form a relatively thin thickness. This is because, in the case of the second pressure sensitive adhesive layer, it is preferable to reduce the thickness, so that when the solvent-free type is used, the thickness uniformity may not be constant.
- a method for producing a pressure-sensitive adhesive layer using a solvent-based pressure-sensitive adhesive for example, an acrylic monomer and a solvent such as a thermal initiator, ethyl acetate, etc. are mixed, and then the temperature is raised to about 60 ° C. so that the polymerization conversion is about 85% or more.
- a polymer adhesive resin is prepared.
- a curing agent is added to the polymer adhesive resin prepared as described above, followed by coating and hot air drying to form a desired film thickness after drying to prepare a second adhesive layer. At least one day of maturation is carried out at a temperature of about 40 ° C. to allow complete curing.
- the above-mentioned 180 ° peeling force can be imparted, and in the case where the adhesion surface is a surface where corrosion does not occur, the type of functional group is not particularly limited.
- the peeling force of the second pressure sensitive adhesive layer may be controlled by controlling the content of the curing agent and the content of functional groups, the molecular weight of the polymer resin, and the glass transition temperature.
- the composition of the second pressure sensitive adhesive layer has good reworkability, it is necessary to maintain a relatively low peeling force, and it is preferable to exclude the use of acrylic acid having excellent adhesive strength, and one functional group such as hydroxy and amide It is preferable to use the monomer which has the above.
- the weight average molecular weights range of a polymeric adhesive resin is 500,000 or more and 1.5 million or less. If it is in the said range, it is unlikely that a residue will remain and wettability after attachment is less likely to float.
- the thickness of the first pressure sensitive adhesive layer 21 may be 50 to 250 ⁇ m, preferably 50 to 150 ⁇ m. When the range of the thickness of the first pressure-sensitive adhesive layer 21 is within the above range, it is easy to manufacture and easy to implement adhesive properties.
- the thickness of the second pressure sensitive adhesive layer 23 may be 5 to 100 ⁇ m, preferably 10 to 50 ⁇ m. When the range of the thickness of the second pressure sensitive adhesive layer 23 is within the above range, rework is easy and it is easy to leave no residue.
- the transparent acrylic resin layer 22 may have a thickness of 5 to 150 ⁇ m, preferably 25 to 75 ⁇ m. If the thickness of the transparent acrylic resin layer 22 is less than 5 ⁇ m, the mechanical strength is insufficient, so durability, scratch resistance and impact resistance are lowered, and manufacturing is not easy. When the thickness of the transparent acrylic resin layer 22 exceeds 150 ⁇ m, the thickness of the touch panel display device according to the present invention becomes thick, which is a violation of the trend of thinning, and it is not easy to bend after attaching the upper and lower adhesives.
- the light transmittance of the said transparent acrylic resin layer 22 is 92% or more.
- the light transmittance of the transparent acrylic resin layer 22 determines the light transmittance of the entire double-sided adhesive sheet.
- the transparent acrylic resin layer 22 may be selected from among primer treatment, corona treatment, plasma treatment, heat treatment, and hard coating treatment on at least one surface in contact with the first pressure sensitive adhesive layer 21 or the second pressure sensitive adhesive layer 23. Either process may be formed.
- the double-sided adhesive sheet may have a CIE brightness index L * of 97 or more and a b * value of 0.5 or less as defined in JIS Z8729.
- the CIE color system is one of the scientific color systems in which color is expressed as the physical quantity of light and the psychological stimulus of human visual sense nerves, of which L * is the brightness and hue and saturation are a *.
- L * is the brightness and hue and saturation are a *.
- b *. a * and b * represent the direction of color, + a * represents Red, -a * represents Green, + b * represents Yellow, and -b * represents Blue Is displayed.
- a b * value is more preferable toward a blue color than yellow, that is, a smaller b * value is preferable.
- the double-sided adhesive sheet 20 has a haze of 1% or less.
- the double-sided adhesive sheet 20 is a total thickness of 50 to 500 ⁇ m, preferably may be formed in the range of 100 to 300 ⁇ m. This corresponds to the thickness of the pressure-sensitive adhesive layer between the touch panel and the display device module. When the thickness of the double-sided adhesive sheet 20 is less than 50 ⁇ m, the air therein does not come out well. It is against the trend of thinning.
- FIG. 3 is a schematic cross-sectional view of a touch panel display device according to another embodiment of the present invention.
- the touch panel 111 is pressure-sensitive.
- the adhesive layer 112 is coupled to the display device module 113 to form the touch panel display device 100, and the double-sided adhesive sheet 120 is adhered between the touch panel 111 and the display device module 113. do.
- the first pressure-sensitive adhesive layer 121 of the double-sided pressure-sensitive adhesive sheet 120 is adhered to the entire surface of the touch panel 111 except for the surface in contact with the pressure-sensitive pressure-sensitive adhesive layer 112,
- the second pressure sensitive adhesive layer 123 is adhered to the front surface of the display device module 113 except for the surface in contact with the pressure-sensitive adhesive layer 112 to remove the air layer between the touch panel 111 and the display device module 113.
- the double-sided adhesive sheet 120 may provide a touch panel display device that is peelable and re-adhesive to a touch panel or a display device module because the double-sided adhesive layers 121 and 123 have different peeling forces. .
- the touch panel 121 may use various methods such as a resistive film method, an optical method, a capacitive method, an ultrasonic method, and the like without limitation, and may use an inorganic or organic substrate as the lower substrate.
- a resistive film method such as a resistive film method, an optical method, a capacitive method, an ultrasonic method, and the like without limitation, and may use an inorganic or organic substrate as the lower substrate.
- Polycarbonate, glass, polymethyl methacrylate (PMMA), SUS and the like can be applied.
- the display device module 123 may be any one selected from a liquid crystal display, a plasma display, an organic electroluminescent display, an electrophoretic display, and an equivalent display, but is not limited thereto.
- the polarizing film is included in the polarizing film, such as triacetyl cellulose (TAC), cyclopolyolefin, acrylate resin and the like.
- a method of fixing a touch panel to a display device module includes attaching a second pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet to a display device module, and then applying the double-sided pressure-sensitive adhesive sheet bonded to the display device module.
- the adhesive layer may be attached to the touch panel, but is not limited thereto.
- the double-sided adhesive sheet according to embodiments of the present invention includes a transparent acrylic resin layer as a base material, and the adhesive layers formed on both sides have different peeling strengths, thereby re-peeling and recycling after attaching the touch panel and the display device module. It is possible to provide a double-sided adhesive sheet as possible, and can be attached between the touch panel and the display module to remove the air layer to improve the visibility of the display device, and to minimize the refractive index of the adhesive sheet to provide the display device with the maximum visibility. have.
- FIG. 1 is a schematic cross-sectional view showing an example of a conventional touch panel display device
- FIG. 2 is a schematic cross-sectional view of a double-sided adhesive sheet according to an embodiment of the present invention
- FIG. 3 is a schematic cross-sectional view of a touch panel display device according to another embodiment of the present invention.
- the first pressure-sensitive adhesive layer 90 parts by weight of ethylhexyl acrylate monomer and 10 parts by weight of acrylic acid monomer were added to a 1 liter reactor, and a thermal initiator was added to increase the temperature to 60 ° C. to partially polymerize a resin having a viscosity of 1000 to 5000 cps. was prepared.
- a second pressure sensitive adhesive layer 98 parts by weight of ethylhexyl acrylate and 2 parts by weight of hydroxy ethyl acrylate were mixed in an ethyl acetate solvent, a thermal initiator was added thereto, and the temperature was raised to 60 ° C. to obtain a molecular weight of 500,000 polymer adhesive resin.
- 1.0 parts by weight of toluene diisocyanate curing agent was mixed with the polymer adhesive resin, and then applied to a release PET in consideration of the thickness after drying, and then put into a hot air oven, followed by drying at 110 ° C. for 1 minute, followed by aging at 40 ° C. for 1 day.
- urethane acrylate oligomer molecular weight 1000
- isobornyl acrylate monomer 1.0 part by weight of photoinitiator Igacure 184 (Irgacure 184) was added, followed by release PET.
- an osram sylvania black fluorescent lamp was irradiated for 3 minutes to prepare an acrylic film.
- the first pressure-sensitive adhesive layer 80 parts by weight of ethylhexyl acrylate monomer, 18 parts by weight of glycidyl methacrylate and 2 parts by weight of acrylic acid monomer were added to a 1 liter reactor, and a thermal initiator was added to raise the temperature to 60 ° C.
- a partially polymerized resin having a viscosity of 1000 to 5000 cps was prepared.
- 1.0 parts by weight of photoinitiator Igacure 184 and 0.2 parts by weight of hexanediol diacrylate were added to the prepared partially polymerized resin, mixed, and applied onto a release PET. The sheet was produced.
- the second pressure-sensitive adhesive layer 60 parts by weight of ethylhexyl acrylate, 30 parts by weight of silicone acrylate and 10 parts by weight of acrylic acid monomer were mixed in an ethyl acetate solvent. Then, a thermal initiator was added and the temperature was raised to 60 ° C. to obtain a molecular weight of 50. A full polymer adhesive resin was prepared. 0.6 parts by weight of aziridine curing agent having two reactors were mixed with the polymer adhesive resin, and applied to a release PET in consideration of the thickness after drying, and then put in a hot air oven, dried at 110 ° C. for 1 minute, and aged at 40 ° C. for 1 day. Was carried out to prepare an adhesive sheet having a thickness of 20 ⁇ m.
- the first adhesive layer was formed by transferring the 180 ⁇ m-thick acrylic pressure-sensitive adhesive layer prepared in Preparation Example 1 to the surface of the transparent acrylic film prepared in Preparation Example 3 by a roll bonding method, and then forming the first pressure-sensitive adhesive layer on the other side of the transparent acrylic film.
- the acrylic adhesive layer having a thickness of 20 ⁇ m prepared in Preparation Example 2 was transferred by a roll bonding method to form a second adhesive layer, thereby preparing a double-sided adhesive sheet having a total thickness of 250 ⁇ m.
- a double-sided pressure-sensitive adhesive sheet was manufactured in the same manner as in Example 1 except that a double-sided pressure-sensitive adhesive sheet having a total thickness of 300 ⁇ m was manufactured using the 100 ⁇ m-thick transparent acrylic film prepared in Preparation Example 3.
- the double-sided adhesive sheet was produced by the method according to Example 1.
- the first pressure-sensitive adhesive layer prepared in Preparation Example 1 prepared in Preparation Example 1 and the second pressure-sensitive adhesive layer prepared in Preparation Example 2 were transferred to each other by a roll bonding method. A 200-micrometer-thick double-sided adhesive sheet was produced.
- a double-sided pressure-sensitive adhesive sheet was manufactured in the same manner as in Example 1 except that a 50 ⁇ m-thick polyethylene terephthalate (PET) film was used instead of the acrylic film prepared in Preparation Example 3 as the intermediate base film.
- PET polyethylene terephthalate
- a double-sided pressure-sensitive adhesive sheet was manufactured in the same manner as in Example 1 except that the first adhesive layer having a thickness of 180 ⁇ m prepared in Comparative Preparation Example 1 was used as the first adhesive layer.
- a double-sided pressure-sensitive adhesive sheet was manufactured in the same manner as in Example 1 except that the second pressure-sensitive adhesive layer having a thickness of 20 ⁇ m prepared in Comparative Preparation Example 2 was used as the second pressure-sensitive adhesive layer.
- the refractive indexes of the first adhesive layer, the transparent acrylic resin layer, and the second adhesive layer of the double-sided adhesive sheets prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were measured (Abe refractometer) and the first adhesive layer , By analyzing the difference in the refractive index of the transparent acrylic resin layer and the second adhesive layer, and evaluated the improvement of visibility burnout according to the effect of lowering the distortion phenomenon.
- the visibility improvement is excellent, it is expressed as O, when the visibility improvement is normal, ⁇ , and when the visibility improvement is insufficient, it is indicated by X.
- Peeling force was measured by peeling double-sided adhesive sheet from polycarbonate and TAC film with peel rate 300mm / min and peel angle 180 ° at 23 ° C temperature using a small tensile tester (Texture Analyzer, TA instrument) instrument. It is shown in Table 1 below.
- the surface of the first pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheets prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was attached to the polycarbonate surface having a thickness of about 1 mm by reciprocating twice with a 2 kg roller, and the second The surface of the pressure-sensitive adhesive layer is laminated on a glass surface with a thickness of about 1 mm and a triacetyl cellulose (TAC) polarizing film is laminated on the surface, and is treated when applied after processing for 30 minutes at a temperature of 60 ° C. and a pressure of 5 atm in an autoclave. Completed bubbles were completely removed.
- TAC triacetyl cellulose
- the treated specimen is left in a 60 ° C. oven for 1 minute and then taken out, and within one minute, it is opened by hand and visually observed whether the second adhesive layer is naturally detached. If the desorption was not easy, it was evaluated as x and shown in Table 1 below.
- the color system was specified after attaching an adhesive sheet on a 1.1 mm thick Soda Lime glass using SHIMADZU 3700N and removing the release PET. In the measurement, the size of the sample was 10 cm ⁇ 10 cm, and 5 sites were measured and averaged.
- the measurement was carried out in the transmission mode in the same manner as the colorimeter measurement.
- the double-sided adhesive sheet according to the embodiments of the present invention from the results of the experimental example for the above Examples and Comparative Examples is superior to the rework property than the double-sided adhesive sheet prepared in the comparative example, the first adhesive layer, the transparent acrylic resin layer and As the difference in refractive index between the second adhesive layers is minimized, it can be confirmed that the optical characteristics of the display device are not impaired.
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Abstract
Description
| 기재필름 | 기재필름굴절율 | 제1점착층굴절율 | 제2점착층굴절율 | 시인성평가 | 제1점착제층 180˚박리력(g/in) | 제2점착제층180˚박리력(g/in) | 리워크 성능 | |
| 실시예1 | 아크릴계 | 1.49 | 1.48 | 1.46 | ○ | 1250 | 10 | ○ |
| 실시예2 | 아크릴계 | 1.49 | 1.46 | 1.45 | ○ | 1107 | 5 | ○ |
| 실시예3 | 아크릴계 | 1.49 | 1.48 | 1.46 | ○ | 965 | 5 | ○ |
| 비교예1 | 없음 | - | 1.48 | 1.46 | X | 3865 | 90 | △ |
| 비교예2 | PET | 1.62 | 1.48 | 1.45 | X | 706 | 89 | △ |
| 비교예3 | 아크릴계 | 1.49 | 1.57 | 1.46 | △ | 3209 | 65 | X |
| 비교예4 | 아크릴계 | 1.49 | 1.48 | 1.42 | △ | 2252 | 176 | X |
| Ts(%) | 헤이즈(%) | L* | a* | b* | |
| 실시예1 | 93.5 | 0.99 | 97.3 | -0.03 | 0.26 |
| 실시예2 | 94.8 | 0.68 | 97.5 | -0.04 | 0.15 |
| 실시예3 | 93.1 | 0.86 | 98.1 | -0.02 | 0.33 |
| 비교예1 | 94.9 | 0.65 | 95.2 | 0.01 | 0.19 |
| 비교예2 | 89.5 | 1.56 | 97.0 | -0.03 | 0.68 |
| 비교예3 | 92.4 | 1.01 | 96.8 | -0.01 | 0.45 |
| 비교예4 | 91.6 | 1.15 | 96.9 | -0.03 | 0.46 |
Claims (16)
- 제 1 점착제층, 투명 아크릴계 수지층 및 제 2 점착제층을 순차로 포함하는 양면 점착 시트로서,상기 제 1점착제층 및 상기 제 2점착제층 각각이 아크릴계 점착제를 포함하고,상기 제 1 점착제층은 터치 패널에 접하게 되고, 상기 제 2 점착제층은 표시장치모듈에 접하게 되며,상기 제 1점착제층과 터치 패널의 점착력이 상기 제 2점착제층과 표시장치 모듈 사이의 접착력보다 큰 것을 특징으로 하는 양면 점착 시트.
- 제 1항에 있어서,상기 제 1 점착제층의 박리 속도 300mm/min 및 온도 23℃에서 기판에 대한 180°박리력이 800 내지 3000g/in 이며,상기 제 2 점착제층의 박리 속도 300mm/min 및 온도 23℃에서 편광필름에 대한 180°박리력이 0 내지 80g/in 인 양면 점착 시트.
- 제 1항에 있어서,상기 제 1점착제층, 투명 아크릴계 수지층 및 제 2점착제층의 굴절율이 1.44~1.55인 것을 특징으로 하는 양면 점착 시트.
- 제 1항에 있어서,상기 제 1점착제층이 포함하는 상기 아크릴계 점착제가, 알킬기의 탄소수가 1~12인 아크릴레이트계 단량체에 대해 5중량% 이상의 양의 작용기 함유 공중합성 단량체를 포함하는 것을 특징으로 하는 양면 점착 시트.
- 제 1항에 있어서,상기 제 2점착제층이 포함하는 상기 아크릴계 점착제가, 알킬기의 탄소수가 1~12인 아크릴레이트계 단량체에 대해 5중량% 이하의 양의 작용기 함유 공중합성 단량체를 포함하는 것을 특징으로 하는 양면 점착 시트.
- 제 1항에 있어서,상기 제 1점착제층의 두께가 상기 제 2 점착제층의 두께보다 두꺼운 양면 점착 시트.
- 제 1항에 있어서,상기 제 1 점착제층은 무용제형 점착제에 의해 형성되고, 상기 제 2 점착제층은 용제형 점착제에 의해 형성되는 양면 점착 시트.
- 제 1 항에 있어서,상기 제 2 점착제층은 하이드록시 및 아마이드 관능기로 이루어진 군에서 선택되는 1종 이상의 관능기를 갖는 아크릴계 모노머를 사용하여 형성되는 양면 점착 시트.
- 제 1항에 있어서,상기 제 1 점착제층의 두께는 5 내지 250㎛이고,상기 제 2 점착제층의 두께는 5 내지 100㎛인 것을 특징으로 하는 양면 점착 시트.
- 제 1항에 있어서,상기 투명 아크릴계 수지층의 광투과도가 92% 이상인 양면 점착 시트.
- 제 1 항에 있어서,상기 투명 아크릴계 수지층은 제 1 점착제층 또는 제 2 점착제층과 접하는 하나 이상의 면에 프라이머 처리, 코로나 처리, 플라즈마 처리, 열 처리 및 하드코팅 처리 중에서 선택된 어느 하나의 처리가 형성된 것인 양면 점착 시트.
- 제 1 항에 있어서,상기 양면 점착 시트는 JIS Z8729에 규정된 CIE 명도지수 L*가 97 이상이며, b* 값이 0.5 이하인 양면 점착 시트.
- 제 1 항에 있어서,상기 양면 점착 시트의 헤이즈가 1 % 이하인 양면 점착 시트.
- 제 1 항에 있어서,상기 양면 점착 시트의 총 두께가 50 내지 500㎛인 양면 점착 시트.
- 제 1 항 내지 제 14 항 중 어느 한 항의 양면 점착 시트를 구비한 터치 패널 표시 장치로서,상기 양면 점착 시트의 제 1 점착제층이 터치 패널의 전면에 접착되고, 상기 양면 점착 시트의 제 2 점착제층이 표시장치모듈의 전면에 접착되며, 상기 양면 점착 시트가 터치 패널 또는 표시장치모듈에 대해 박리 및 재접착가능한 터치 패널 표시 장치.
- 제 1 항 내지 제 14 항 중 어느 한 항의 양면 점착 시트의 제 2 착제층을 표시장치모듈에 접착하는 단계; 및상기 양면 점착 시트의 제 1 점착제층을 터치 패널에 접착하는 단계를 포함하는 터치 패널의 표시장치모듈에 대한 고정방법.
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| JP2013538654A JP5947803B2 (ja) | 2010-11-22 | 2011-11-11 | 両面粘着シート及びそれを含むタッチパネル表示装置 |
| EP11843505.6A EP2644670B1 (en) | 2010-11-22 | 2011-11-11 | Double-sided adhesive sheet and display device for touch panel including same |
| CN201180056203.7A CN103228748B (zh) | 2010-11-22 | 2011-11-11 | 双面粘结片和包括该粘结片的触控面板用显示设备 |
| US13/988,126 US10479912B2 (en) | 2010-11-22 | 2011-11-11 | Double-sided adhesive sheet and display device for touch panel including same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2010-0116342 | 2010-11-22 | ||
| KR20100116342 | 2010-11-22 |
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| WO2012070791A2 true WO2012070791A2 (ko) | 2012-05-31 |
| WO2012070791A3 WO2012070791A3 (ko) | 2012-09-27 |
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| EP (1) | EP2644670B1 (ko) |
| JP (1) | JP5947803B2 (ko) |
| KR (1) | KR101393778B1 (ko) |
| CN (1) | CN103228748B (ko) |
| TW (1) | TWI488936B (ko) |
| WO (1) | WO2012070791A2 (ko) |
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- 2011-11-10 KR KR1020110117035A patent/KR101393778B1/ko active Active
- 2011-11-11 CN CN201180056203.7A patent/CN103228748B/zh not_active Expired - Fee Related
- 2011-11-11 JP JP2013538654A patent/JP5947803B2/ja active Active
- 2011-11-11 WO PCT/KR2011/008601 patent/WO2012070791A2/ko not_active Ceased
- 2011-11-11 EP EP11843505.6A patent/EP2644670B1/en active Active
- 2011-11-11 US US13/988,126 patent/US10479912B2/en active Active
- 2011-11-18 TW TW100142316A patent/TWI488936B/zh not_active IP Right Cessation
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101521329B1 (ko) * | 2012-07-31 | 2015-05-18 | (주)인터플렉스 | 반사방지층을 포함하는 센서 패널 |
| JPWO2014181853A1 (ja) * | 2013-05-10 | 2017-02-23 | 王子ホールディングス株式会社 | 積層粘着シート及び積層体 |
| US20140333846A1 (en) * | 2013-05-13 | 2014-11-13 | Compal Electronics, Inc. | Display apparatus, fabricating method thereof and optical adhesive |
| US9465408B2 (en) * | 2013-05-13 | 2016-10-11 | Compal Electronics, Inc. | Display apparatus, fabricating method thereof and optical adhesive |
| US10265927B2 (en) | 2015-07-22 | 2019-04-23 | Nitto Denko Corporation | Transparent electroconductive layer-equipped cover element provided with transparent pressure-sensitive adhesive layer |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2644670B1 (en) | 2020-08-19 |
| JP2014502292A (ja) | 2014-01-30 |
| JP5947803B2 (ja) | 2016-07-06 |
| EP2644670A2 (en) | 2013-10-02 |
| CN103228748A (zh) | 2013-07-31 |
| WO2012070791A3 (ko) | 2012-09-27 |
| TWI488936B (zh) | 2015-06-21 |
| US10479912B2 (en) | 2019-11-19 |
| KR20120055454A (ko) | 2012-05-31 |
| KR101393778B1 (ko) | 2014-05-13 |
| CN103228748B (zh) | 2015-05-06 |
| US20130241862A1 (en) | 2013-09-19 |
| TW201231606A (en) | 2012-08-01 |
| EP2644670A4 (en) | 2017-08-23 |
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