WO2017014402A1 - 디스플레이용 양면 점착 테이프 및 제조방법 - Google Patents
디스플레이용 양면 점착 테이프 및 제조방법 Download PDFInfo
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- WO2017014402A1 WO2017014402A1 PCT/KR2016/002878 KR2016002878W WO2017014402A1 WO 2017014402 A1 WO2017014402 A1 WO 2017014402A1 KR 2016002878 W KR2016002878 W KR 2016002878W WO 2017014402 A1 WO2017014402 A1 WO 2017014402A1
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- layer
- acrylic
- adhesive tape
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Definitions
- It relates to a double-sided adhesive tape for display and a manufacturing method.
- a double-sided adhesive tape is used to bond and fix various types of display panels, electronic components, and the like.
- the double-sided adhesive tape may be interposed between the display window and the display assembly to serve to adhere the double-sided adhesive tape.
- the double-sided adhesive tape prevents intrusion of external impurities and the like while fixing the edges of the display.
- the light emitted from the light source mounted on the rear of the panel or the like may be prevented from leaking from the edge of the display.
- the double-sided adhesive tape has a structure including an adhesive layer on both sides of the foam layer, and examples of such foam layer include a polyurethane foam layer, an acrylic foam layer, and the like, and the impact resistance may be secured to some extent including the foam layer. There is a problem of insufficient tensile strength or dimensional stability.
- the double-sided adhesive tape usually includes a black colorant in the foam layer, the adhesive layer, or both, in order to prevent the light emitted from the light source mounted on the rear of the liquid crystal panel, etc., from leaking out. Since the black colorant absorbs the UV color irradiated at and the photocuring does not occur sufficiently or the amount of irradiation should be increased, the efficiency of the photocuring reaction is too low, and the adhesive physical properties of the adhesive layer may be reduced.
- a double-sided adhesive tape for a display that simultaneously implements excellent impact resistance, excellent dimensional stability and excellent adhesion.
- a method of manufacturing the double-sided adhesive tape for display is provided.
- the first acrylic pressure-sensitive adhesive layer comprises Acrylic foam layer; A thermoplastic film layer having a black layer laminated on at least one surface thereof; It provides a double-sided adhesive tape for a display comprising a; and an acrylic foam layer comprising a second acrylic adhesive layer.
- forming a black layer on at least one surface of the thermoplastic film layer comprising a.
- the double-sided pressure-sensitive adhesive tape for display including the acrylic foam layer, while maintaining excellent impact resistance further includes a thermoplastic film layer further has the advantage that can realize excellent dimensional stability by further improving the tensile strength of the double-sided pressure-sensitive adhesive tape .
- a liquid crystal panel or the like can be produced without the problem of lowering the efficiency of the photocuring reaction when forming the foam layer as described above, and deteriorating the adhesive property of the adhesive layer. It is possible to effectively prevent the light emitted from the light source or the like mounted on the rear side of the leak.
- thermoplastic film layer may be laminated on the black layer on one side or both sides, thereby effectively improving the interfacial adhesion between the layers, thereby realizing excellent long-term durability while improving the overall physical properties of the double-sided adhesive tape for display. .
- Each of the first acrylic adhesive layer, the acrylic foam layer, and the second acrylic adhesive layer may not include a separate colorant, thereby improving the efficiency of the photocuring reaction to further improve the impact resistance of the acrylic foam layer. At the same time, it can be implemented at an excellent level without reducing the adhesive properties of the first and second acrylic adhesive layers.
- the double-sided adhesive tape for display has an advantage that can be implemented at the same time excellent impact resistance, excellent dimensional stability and excellent adhesion.
- FIG. 1 is a schematic cross-sectional view of a double-sided adhesive tape for display according to an embodiment of the present invention.
- FIG. 2 is a schematic process flowchart of a method of manufacturing a double-sided adhesive tape for display according to another embodiment of the present invention.
- any configuration is formed on the top (or bottom) of the substrate or on the top (or bottom) of the substrate, not only means that the arbitrary configuration is formed in contact with the top (or bottom) of the substrate, but also the substrate It is not limited to not including other configurations between and any configuration formed on (or under) the substrate.
- FIG. 1 schematically shows a cross section of a double-sided adhesive tape 100 for a display according to an embodiment of the present invention.
- the double-sided adhesive tape 100 for display the first acrylic adhesive layer 141 in sequence; Acrylic foam layer 130; A thermoplastic film layer 110 having a black layer 120 laminated on at least one surface thereof; And a second acrylic adhesive layer.
- the double-sided adhesive tape has a structure including an adhesive layer on both sides of the foam layer, and examples of such foam layer include polyurethane foam layer, acrylic foam layer, and the like, and the impact resistance including the foam layer can be secured to some extent.
- foam layer include polyurethane foam layer, acrylic foam layer, and the like, and the impact resistance including the foam layer can be secured to some extent.
- the tensile strength or dimensional stability is not sufficient.
- the double-sided adhesive tape usually includes a black colorant in the foam layer, the adhesive layer, or both, in order to prevent leakage of light irradiated from a light source mounted on the rear side of the liquid crystal panel or the like.
- the black colorant absorbs the UV light emitted during the foaming layer formation, and thus the photocuring may not be sufficiently performed or the amount of irradiation should be increased. Thus, the efficiency of the photocuring reaction becomes too low. This can be degraded.
- thermoplastic film layer 110 further improves the tensile strength of the double-sided adhesive tape 100 By doing so, there is an advantage that excellent dimensional stability can be realized.
- the black layer 120 on one or both surfaces of the thermoplastic film layer 110, the problem of lowering the efficiency of the photocuring reaction when forming the foam layer as described above and the adhesive physical properties of the adhesive layer are lowered. It is possible to effectively prevent leakage of light irradiated from a light source or the like mounted behind the liquid crystal panel or the like without a problem.
- the thermoplastic film layer 110 is, for example, polyethylene (polyethylene), polypropylene (polypropylene), polyurethane (polyurethane), polyethylene terephthalate (polyethyleneterephthalate), polybutylene terephthalate (polybutyleneterephthalate), polyurea (polyurea) ), Polyvinylchloride, polyvinylacetate, ethylenevinylacetate, polyphenylene sulfide, polyamide, polyimide, polybenzimidazole ), Polyetheretherketone (polyetheretherketone) and may include at least one selected from the group consisting of a combination thereof, specifically, it can implement more excellent dimensional stability, including polyethylene terephthalate.
- the thermoplastic film layer may have a thickness of about 4 ⁇ m to about 150 ⁇ m. By having a thickness within the above range can be achieved sufficient dimensional stability without excessively increasing the total thickness of the double-sided adhesive tape 100 for display.
- the black layer 120 may be stacked on one surface or both surfaces of the thermoplastic film layer, and specifically, may be stacked on both surfaces.
- the interfacial adhesion between the acrylic foam layer 130 and the thermoplastic film layer is lower than the interfacial adhesion between the acrylic foam layer 130 and the black layer 120, and the interfacial adhesion between the second adhesive layer and the thermoplastic film layer is It is lower than the interfacial adhesion between the second adhesive layer and the black layer 120.
- the interfacial adhesion between the layers can be effectively improved, so that the overall physical properties of the double-sided adhesive tape 100 for display can be improved. Excellent long term durability can be achieved while improving.
- the black layer 120 may be formed by, for example, applying and drying a black composition including a black colorant to at least one surface of the thermoplastic film layer.
- the method of applying the black composition may be any one selected from, for example, a die coating method, a gravure coating method, a knife coating method, a bar coating method, a spray coating method, or a screen printing method, but is not limited thereto. Not.
- the black colorant may be, for example, a carbon black colorant, a graphite colorant, an iron oxide colorant, an anthraquinone colorant, a cobalt oxide colorant, a copper oxide colorant, a manganese colorant, an antimony oxide colorant, a nickel oxide colorant, and the like. It may include at least one selected from the group consisting of a combination thereof.
- CI pigment black 6, 7, 9, CI pigment black 8, 10, etc. CI pigment black 11, 12, 27, Pigment Brown 35, etc. Titanium Black, CI Pigment Black 20, CI Pigment Black 13, 25, etc., CI Pigment Black 15, 28, etc., CI Pigment Black 14, etc. Mention black 23 and the like.
- the black composition may further include a binder resin, for example, the binder resin may be a polyurethane resin, a polyester resin, a polyacrylate resin, a polymethacrylate resin, a polyisoprene resin, a polysilicon, and the like. It may include at least one selected from the group consisting of a combination thereof, but is not limited thereto.
- the binder resin may be a polyurethane resin, a polyester resin, a polyacrylate resin, a polymethacrylate resin, a polyisoprene resin, a polysilicon, and the like. It may include at least one selected from the group consisting of a combination thereof, but is not limited thereto.
- the black composition may include about 30 parts by weight to about 150 parts by weight of the black colorant based on about 100 parts by weight of the binder resin.
- the black composition may further include a solvent, a dispersant, or both.
- the solvent may include, for example, at least one selected from the group consisting of ester compounds, aromatic hydrocarbon compounds, ether compounds, ketone compounds, and combinations thereof, specifically n-propyl acetate and n- Butyl acetate, benzene, toluene, xylene, dibutyl ether, isopropyl ether, dioxane, tetrahydrofuran, acetone, diethyl ketone, methyl ethyl ketone, methyl isobutyl ketone, methyl propyl ketone, cyclohexanone and It may include at least one selected from the group consisting of a combination thereof, but is not limited thereto.
- the solvent may be evaporated in the process of applying and drying the black composition to form the black layer 120, so that the relative amount of the black colorant, for example, the weight percent is the black composition and the black layer 120 May be different.
- the black layer 120 may include, for example, about 10 wt% to about 80 wt% of the black colorant, and specifically, about 40 wt% to about 80 wt%.
- the black layer 120 may have a thickness of about 0.1 ⁇ m to about 5 ⁇ m, and the light transmittance of the black layer 120 may be about 4.0% or less, for example, about 0% to about 3.0%. have.
- having a thickness within the above range can implement excellent interfacial adhesion between the acrylic foam layer 130 or the second pressure-sensitive adhesive layer, the light emitted from the light source mounted on the rear of the liquid crystal panel, etc. leak out It can prevent enough.
- having the light transmittance within the above range it is possible to effectively prevent the light emitted from the light source mounted on the rear of the liquid crystal panel or the like to leak out.
- each of the first acrylic adhesive layer 141, the acrylic foam layer 130, and the second acrylic adhesive layer 142 may not include a separate colorant.
- the first and second acrylic adhesive layers 141 and 142 and the acrylic foam layer 130 are formed by forming the black layer 120 as a separate layer on one or both surfaces of the thermoplastic film. It may not include a black colorant, thereby improving the efficiency of the photocuring reaction to further improve the impact resistance of the acrylic foam layer 130, and at the same time the first and second acrylic adhesive layer 141 , 142) can be implemented at an excellent level without lowering the adhesive properties.
- the acrylic foam layer 130 is formed by performing any one of UV irradiation and heat treatment, or sequentially UV irradiation and heat treatment for the foaming composition; Or it may be formed by performing UV irradiation while injecting gas to the foaming composition.
- the UV curing reaction may be advanced by the UV irradiation, and the thermal curing reaction may be advanced by the heat treatment.
- the acrylic foam layer 130 is formed by performing any one of UV irradiation and heat treatment, or sequentially UV irradiation and heat treatment to the foaming composition comprising an acrylic polymer and a filler for forming pores, or ; Or it may be formed by performing UV irradiation while injecting a gas to the foaming composition containing an acrylic polymer and does not contain a filler for pore forming.
- the UV irradiation is, for example, of about 500mJ / cm 2 to about can be carried out by UV irradiation of 2,500mJ / cm 2, specifically about 500mJ / cm 2 to about 2,000mJ It can be carried out with a UV radiation of / cm 2 .
- the acrylic foam layer 130 does not include a colorant, UV is not consumed by this, and thus the photocuring reaction can be effectively performed even with a small dose, thereby improving the efficiency of the photocuring reaction. have.
- the heat treatment may be performed at, for example, about 30 ° C. to about 60 ° C. for about 24 hours to about 48 hours, but is not limited thereto.
- the acrylic polymer is formed by polymerizing a copolymerizable monomer component including an alkyl (meth) acrylate monomer and a polar functional group-containing monomer, and containing the alkyl (meth) acrylate monomer to the polar functional group to form the acrylic polymer.
- the weight ratio of monomers may be about 30: 1 to about 9: 1.
- the acrylic polymer may have appropriate flexibility at room temperature, and thus the foaming composition including the same may effectively improve impact resistance by implementing excellent adhesion and wetting properties.
- the alkyl (meth) acrylate-based monomer means a (meth) acrylate-based monomer containing an alkyl group, the alkyl group may include at least one selected from the group consisting of linear, alicyclic, anti-hanging, or a combination thereof.
- the polar functional group-containing monomer may include, for example, at least one selected from the group consisting of a hydroxy group-containing monomer, a carboxyl group-containing monomer, a nitrogen-containing monomer, and a combination thereof, for example, 2-hydroxyethyl (meth) Acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxy Hydroxyethylene glycol (meth) acrylate or 2-hydroxypropylene glycol (meth) acrylate, (meth) acrylic acid, 2- (meth) acryloyloxy acetic acid, 3- (meth) acryloyloxy propyl acid, 4 (Meth) acryloyloxy butyric acid, acrylic acid duplex, itaconic acid, maleic acid and maleic anhydride, (meth) acrylamide, N-vinylpyrrol
- the acrylic polymer may have a viscosity of about 2,000 cP to about 30,000 cP at about 25 ° C. By having a viscosity within the above range, the foaming composition may realize excellent coating property to form the acrylic foam layer 130 at a more uniform level.
- the pore-forming filler may be included in an amount of about 0.1 parts by weight to about 10 parts by weight based on 100 parts by weight of the acrylic polymer, and the gas may be injected at a flow rate of about 0.001 cubic feet per minute (CFM) to about 0.05 CFM. .
- CFM cubic feet per minute
- the pore-forming filler may include, for example, at least one selected from the group consisting of a polymer micro-hollow sphere, a glass bubble, a glass macro balloon, and a combination thereof.
- the pore-forming filler may have, as particles, an average particle diameter of, for example, about 1 ⁇ m to about 350 ⁇ m, and specifically about 20 ⁇ m to about 150 ⁇ m.
- the pore-forming filler may include pre-expanded foam particles, non-foamed foam particles, or both.
- the pore-forming filler may include foamed particles without including unfoamed particles, and thus a separate heat treatment process for foaming unfoamed particles when the acrylic foam layer 130 is formed is omitted. Since it can be formed only by the UV irradiation process and the acrylic foam layer 130 can be easily formed to a thicker level.
- the filler for forming the pore includes unfoamed particles, heat transfer must be performed smoothly into the acrylic foam layer 130 in order to foam it, and accordingly, the thickness of the acrylic foam layer 130 should be limited to a predetermined level. Can be.
- the gas may include, for example, but is not limited to, at least one selected from the group consisting of air, nitrogen, argon, helium, neon, and combinations thereof.
- nitrogen which is one of the inert gases, it is possible to prevent unexpected changes in the physical properties of the acrylic adhesive composition while maintaining the cost at an appropriate level.
- the foaming composition may further include other blowing agents, and the other blowing agents include, for example, ammonium carbonate, sodium bicarbonate, azodicarbonamide (ADCA), azobisisobutylonitrile (AIBN), dititroso Pentane methylenetetramine (DPT), P-toluenesulfonylhydrazide (TSH), P, P'-oxybis (benzenesulfonylhydrazide (OBSH), and the like.
- the other blowing agents include, for example, ammonium carbonate, sodium bicarbonate, azodicarbonamide (ADCA), azobisisobutylonitrile (AIBN), dititroso Pentane methylenetetramine (DPT), P-toluenesulfonylhydrazide (TSH), P, P'-oxybis (benzenesulfonylhydrazide (OBSH), and the like.
- the foaming composition may include, for example, photoinitiators, thermal initiators, thermosetting agents, photocuring agents, crosslinking agents, tackifiers, coupling agents, antistatic agents, inorganic fillers, sunscreen agents, surfactants, antioxidants, processed oils and their At least one additive selected from the group consisting of a combination may be further included.
- the tackifier may include at least one selected from the group consisting of rosin ester tackifiers, rosin tackifiers, terpene tackifiers, petroleum resin tackifiers, and combinations thereof. It may include about 10 parts to about 40 parts by weight based on 100 parts by weight.
- the inorganic filler may include at least one selected from the group consisting of aluminum hydroxide, calcium carbonate, aluminum oxide, magnesium oxide, zinc oxide, silicon carbide, aluminum nitride, boron nitride, silicon nitride, and combinations thereof. About 100 parts by weight to about 200 parts by weight.
- the acrylic foam layer 130 may have an average size of pores of about 20 ⁇ m to about 200 ⁇ m, porosity of about 1% to about 40%.
- the porosity may mean volume%.
- the average size and porosity of the pores in the above range By having the average size and porosity of the pores in the above range, the physical properties such as the storage modulus, the maximum value of the loss tangent required by the double-sided adhesive tape 100 for display can be sufficiently satisfied, thereby improving the impact resistance effectively. .
- the acrylic foam layer 130 may have a thickness of about 30 ⁇ m to about 1,000 ⁇ m, but is not limited thereto.
- the first and second acrylic adhesive layers may be formed by, for example, an adhesive composition including at least one selected from the group consisting of (meth) acrylic monomers, oligomers, resins, and combinations thereof.
- a thermal initiator, a photoinitiator, a thermosetting agent, a photocuring agent, a crosslinking agent, a plasticizer may be further included.
- the first and second acrylic adhesive layers may be formed by, for example, light irradiation, heat treatment, or both of the adhesive compositions. Photocuring reaction can be advanced by the said light irradiation, and thermosetting reaction can be advanced by the said heat processing.
- the said (meth) acrylic-type resin is urethane (meth) acrylate resin, polyester (meth) acrylate resin, epoxy (meth) acrylate resin, polyether (meth) acrylate resin, polybutadiene (meth), for example. It may include at least one selected from the group consisting of acrylate resins and combinations thereof, but is not limited thereto.
- the (meth) acrylic resin may be formed by polymerizing a copolymerizable monomer component including an alkyl group-containing (meth) acrylate-based monomer and a carboxyl group-containing (meth) acrylate-based monomer, wherein the (meth) The weight ratio of the alkyl group-containing (meth) acrylate monomer to the carboxyl group-containing (meth) acrylate monomer in the copolymerizable monomer component forming the acrylic resin may be about 1: 0.05 to about 1: 0.25.
- the copolymerizable monomer component forming the (meth) acrylic resin includes the alkyl group-containing (meth) acrylate-based monomer and the carboxyl group-containing (meth) acrylate-based monomer in a weight ratio within the above range, thereby providing the (meth) acrylic resin.
- the adhesive composition comprising may implement excellent adhesion to a substrate having a low surface energy, such as a thermoplastic.
- the adhesive force of each of the first acrylic adhesive layer 141 and the second acrylic adhesive layer 142 may be, for example, about 2,350 g / in to about 4,000 g / in, and specifically about 2,500 g / in. To about 4,000 g / in.
- the adhesive force means the adhesive force measured on the plastic substrate.
- the adhesive properties may not be lowered, and thus, the adhesive force may be appropriately implemented at a high level.
- the thicknesses of the first acrylic adhesive layer 141 and the second acrylic adhesive layer 142 may be about 25 ⁇ m to about 100 ⁇ m, respectively, but are not limited thereto.
- the thicknesses of the first acrylic adhesive layer 141 and the second acrylic adhesive layer 142 may be different or the same within the above range.
- the second acrylic pressure-sensitive adhesive layer 142 of the thermoplastic film layer 110 may further include a release layer on the opposite side of the laminated surface, the release layer is known in the art It may be formed of a coating composition comprising a release material of a kind, the release material may include, for example, a polyester-based polymer, silicone, and the like, but is not limited thereto.
- the release layer may have a thickness of about 50 ⁇ m to about 150 ⁇ m, but is not limited thereto.
- the double-sided adhesive tape 100 may have a tensile strength of about 100 MPa to about 500 MPa, and an impact strength of about 0.7 mJ to about 2.0 mJ.
- the tensile strength can be measured according to JIS K 7113 standard.
- Figure 2 schematically shows a process flow diagram of a method of manufacturing a double-sided adhesive tape for display according to another embodiment of the present invention.
- the manufacturing method includes the steps of forming a black layer on at least one surface of the thermoplastic film layer (S1); Forming an acrylic foam layer (S2); Stacking the thermoplastic plastic film layer having the black layer formed on the at least one surface and the acrylic foam layer to form a laminate (S3); Forming an acrylic adhesive layer on both sides of the laminate, to prepare a double-sided adhesive tape for display (S4); may include.
- a black composition including a black colorant may be applied and dried on at least one surface of the thermoplastic film layer to form the black layer.
- the black composition and the thermoplastic film layer are as described above in one embodiment.
- the method of applying the black composition may be any one selected from, for example, a die coating method, a gravure coating method, a knife coating method, a bar coating method, a spray coating method, or a screen printing method, but is not limited thereto. Not.
- the black layer may be formed to include, for example, about 10% to about 80% by weight of a black colorant, specifically about 40% to about 80% by weight It may be formed to include.
- the thickness of the black layer may be about 0.1 ⁇ m to about 5 ⁇ m, and the light transmittance may be, for example, about 4.0% or less, and specifically, about 0% to about It may be formed to be 3.0%.
- both the acrylic foam layer and the acrylic adhesive layer may not include a separate colorant.
- the first and second acrylic adhesive layers and the acrylic foam layer may not include a black colorant.
- the impact resistance of the acrylic foam layer may be further improved by improving the efficiency of the photocuring reaction, and at the same time, the adhesive physical properties of the first and second acrylic adhesive layers may be further improved.
- any one of UV irradiation and heat treatment, or sequentially UV irradiation and heat treatment for the foaming composition, or UV irradiation while injecting a gas to the foaming composition to perform an acrylic foam layer can be formed.
- the acrylic foam layer is any one of UV irradiation and heat treatment, or sequentially UV irradiation and heat treatment to the foaming composition comprising an acrylic polymer and a filler for forming pores, or comprises an acrylic polymer And it can be formed by performing a UV irradiation while injecting a gas to the foaming composition containing no filler for pore forming.
- the foaming composition is as described above in one embodiment.
- the acrylic foam layer is formed using a foaming composition comprising an acrylic polymer and a filler for forming a pore
- the acrylic foam layer is formed by performing UV irradiation, is formed by performing a heat treatment, or sequentially UV irradiation and heat It can be formed by performing a treatment.
- the acrylic foam layer when the acrylic foam layer is formed using a foaming composition including an acrylic polymer and a filler for forming a pore, the acrylic foam layer may be formed by performing UV irradiation while injecting a gas.
- the acrylic polymer is formed by polymerizing a copolymerizable monomer component including an alkyl (meth) acrylate monomer and a polar functional group-containing monomer, and containing the alkyl (meth) acrylate monomer to the polar functional group to form the acrylic polymer.
- the weight ratio of monomers may be about 30: 1 to about 9: 1.
- the acrylic polymer may have appropriate flexibility at room temperature, and thus the foaming composition including the same may effectively improve impact resistance by implementing excellent adhesion and wetting properties.
- the acrylic polymer may have a viscosity of about 2,000 cP to about 30,000 cP at about 25 ° C. By having a viscosity within the above range, the foaming composition may realize excellent coating property, thereby forming the acrylic foam layer at a more uniform level.
- the pore-forming filler may be included in an amount of about 0.1 parts by weight to about 10 parts by weight based on 100 parts by weight of the acrylic polymer, and the gas may be injected at a flow rate of about 0.001 cubic feet per minute (CFM) to about 0.05 CFM. .
- CFM cubic feet per minute
- an aging treatment may be further performed, and the aging treatment may be performed in the art. It can be carried out by a known method and is not particularly limited.
- the UV irradiation is, for example, of about 500mJ / cm 2 to about can be carried out by UV irradiation of 2,500mJ / cm 2, specifically about 500mJ / cm 2 to about 2,000 It can be carried out with a UV radiation of mJ / cm 2 .
- the acrylic foam layer does not include a colorant, UV is not consumed by this, and thus the photocuring reaction can be effectively performed even with a small dose, thereby improving the efficiency of the photocuring reaction.
- the heat treatment may be performed at, for example, about 30 ° C. to about 60 ° C. for about 24 hours to about 48 hours, but is not limited thereto.
- the acrylic foam layer may be formed so that the average size of the pores is about 20 ⁇ m to about 200 ⁇ m, the porosity is about 1% to about 40%.
- the porosity may mean volume%.
- the average size and porosity of the pores in the above range, the physical properties such as the storage modulus required for the double-sided adhesive tape for display, the maximum value of the loss tangent can be sufficiently satisfied, and thus the impact resistance can be effectively improved.
- the acrylic foam layer may be formed to have a thickness of about 30 ⁇ m to about 1,000 ⁇ m, but is not limited thereto.
- the laminate may be formed by stacking the thermoplastic film layer having the black layer on the at least one surface and the acrylic foam layer.
- Their lamination can be carried out according to methods known in the art, for example, lamination by applying heat and pressure, but is not limited thereto.
- An acrylic adhesive layer may be formed on both surfaces of the laminate to prepare a double-sided adhesive tape for display.
- the first and second acrylic adhesive layers may be formed by, for example, an adhesive composition including at least one selected from the group consisting of (meth) acrylic monomers, oligomers, resins, and combinations thereof.
- a thermal initiator, a photoinitiator, a thermosetting agent, a photocuring agent, a crosslinking agent, a plasticizer may be further included.
- the adhesive composition is as described above in one embodiment.
- the first and second acrylic pressure-sensitive adhesive layer may be formed by applying the pressure-sensitive adhesive composition on both sides of the laminate sequentially or simultaneously and then performing light irradiation, heat treatment, or both.
- the applied pressure-sensitive adhesive composition may be formed by performing a photo curing reaction, a thermal curing reaction, or both.
- the method of applying the pressure-sensitive adhesive composition may use the method of applying the black composition described above in one embodiment.
- each of the first acrylic adhesive layer and the second acrylic adhesive layer may be, for example, about 2,350 g / in to about 4,000 g / in, and specifically about 2,500 g / in to about 4,000. It may be formed to be g / in.
- the adhesive force means the adhesive force measured on the plastic substrate.
- first and second acrylic adhesive layers do not include a colorant, adhesive properties may not be lowered, and thus adhesive force may be more effectively improved.
- the thicknesses of the first acrylic adhesive layer and the second acrylic adhesive layer may be formed to be about 25 ⁇ m to about 100 ⁇ m, respectively, but are not limited thereto.
- the thicknesses of the first acrylic adhesive layer and the second acrylic adhesive layer may be different from each other or the same within the above range.
- a step of forming a release layer on the opposite surface of the surface of the thermoplastic film layer laminated on the second acrylic adhesive layer; may be further included.
- the release layer may be formed of a coating composition including a release material of a kind known in the art, and the release material may include, for example, a polyester-based polymer, silicone, or the like, but is not limited thereto. .
- the release layer may be formed to have a thickness of about 50 ⁇ m to about 150 ⁇ m, but is not limited thereto.
- the double-sided adhesive tape may be formed so that the tensile strength is about 100MPa to about 500MPa, and the impact strength is about 0.7mJ to about 2.0mJ. By forming to have a tensile strength and impact strength within the above range it can effectively improve the dimensional stability and at the same time maintain excellent impact resistance.
- a black composition comprising 100 parts by weight of a polyurethane resin and 33.3 parts by weight of a carbon black pigment as a black colorant, 6.6 parts by weight of a dispersant, and 193.0 parts by weight of a solvent, was applied and dried on one surface of a 38 ⁇ m-thick PET film layer to give a black thickness of 2 ⁇ m. A layer was formed.
- the foaming composition was prepared by adding 100 parts by weight of aluminum hydroxide (H-100, manufactured by Showa Denko) and stirring sufficiently until the composition was uniform.
- the micro-hollow spheres correspond to the foamed particles in advance, to form an acrylic foam layer having a thickness of 0.15mm by performing UV irradiation with a UV irradiation amount of 1,200mJ / cm 2 with respect to the foaming composition.
- the black layer and the acrylic foam layer are laminated so as to contact each other, and then thermally laminated to form a laminate, and the adhesive composition containing an acrylate-based resin and a photocuring agent is coated and photocured on both sides of the laminate, respectively.
- the double-sided adhesive tape for display was manufactured by forming the 1st and 2nd acrylic adhesive layers of 50 micrometer thickness.
- Example 2 black layer formed on both sides
- Comparative Example 1 (does not include thermoplastic film layer having black layer, but includes black colorant in acrylic foam layer)
- Example 2 To the same foaming composition prepared in Example 1, 0.25 parts by weight of carbon black was further mixed as a black colorant to prepare a foaming composition.
- thermoplastic film layer including the black layer was not included, except that the UV composition was performed at a UV irradiation amount of 3,000 mJ / cm 2 with respect to the foaming composition using the foaming composition further mixed with the black colorant. Then, under the same conditions and methods as in Example 1, an acrylic foam layer, first and second acrylic adhesive layers were formed to prepare a double-sided adhesive tape for display.
- Comparative Example 2 (does not include the thermoplastic film layer having a black layer and includes a black colorant in the first and second acrylic adhesive layers)
- the acrylic foamed layer, the first and the second acrylic adhesives were prepared under the same conditions and methods as in Example 1, except that the adhesive composition in which the black layer was formed was not included and the black colorant was further mixed.
- the layer was formed to prepare a double-sided adhesive tape for display.
- Measuring method Measured by using a tensile strength measuring instrument (Zwick Roell, model name: Z100) according to the standard of JIS K 7113 for the double-sided adhesive tape for display according to Examples 1, 2 and Comparative Examples 1, 2 It was.
- Test speed 50 mm / min.
- Measuring method The double-sided adhesive tape for display according to Examples 1 and 2 and Comparative Examples 1 and 2 was measured using a Dupont type impact tester.
- the dropping impact test was performed by observing whether the glass and the double-sided adhesive tape were detached while dropping the weight of 100 g with respect to the glass surface of the laminate specimen at a height of 50 mm from 50 mm to 500 mm in sequence.
- UDM Universal Tester
- ASTM D 3330 for each of the acrylic adhesive layers contained in the double-sided adhesive tape for display according to Examples 1 and 2 and Comparative Examples 1 and 2, respectively
- Texture Analyzer XT Plus Peel strength was measured using Stable micro systems, and the adhesion was evaluated.
- the polycarbonate substrate having a width of 50 mm and a length of 120 mm was washed with a solution in which isopropyl alcohol and water were mixed at a volume ratio of 50:50, and then dried. Subsequently, a polyethylene terephthalate film having a thickness of 50 ⁇ m was attached to one surface of each of the acrylic adhesive layers, and the substrate of the polycarbonate material was attached to the other surface of the acrylic adhesive layer, followed by rolling twice with a 2Kg roller to laminate the specimen. 5 were prepared. Subsequently, the specimens were left at room temperature for about 30 minutes and then peeled from the polycarbonate substrate at 300 mm / min and 180 ° peel angle at room temperature. It measured and evaluated these average value as peeling strength.
- the double-sided adhesive tape for display according to Examples 1 and 2 is measured at a high level of both tensile strength, impact, and shear strength, it is clear that excellent impact resistance and excellent dimensional stability can be implemented simultaneously Confirmed. In addition, it was clearly confirmed that the acrylic adhesive layer was able to further improve the efficiency of the photocuring reaction due to the small amount of UV radiation consumed when forming the acrylic foam layer while achieving excellent adhesive properties.
- the double-sided pressure-sensitive adhesive tape for display according to Comparative Examples 1 and 2 was inferior in dimensional stability because it was measured at a low level of tensile strength, in the case of Comparative Example 1 photocuring reaction due to the large amount of UV radiation consumed when forming the acrylic foam The efficiency was low, and in Comparative Example 2 it was clearly confirmed that the adhesive physical properties of the acrylic adhesive layer is low.
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Abstract
Description
인장강도(MPa) | 충격강도(mJ) | 점착력(g/in) | 아크릴계 발포층 형성시 UV 조사량(mJ/cm2) | |
실시예1 | 201 | 0.784 | 2,800 | 1200 |
실시예2 | 208 | 0.980 | 2,800 | 1200 |
비교예1 | 10 | 0.662 | 2,800 | 3000 |
비교예2 | 12 | 0.441 | 2,300 | 1200 |
Claims (21)
- 순차적으로, 제1 아크릴계 점착층; 아크릴계 발포층; 적어도 일면에 흑색층이 적층된 열가소성 플라스틱 필름층; 및 제2 아크릴계 점착층을 포함하는 디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 양면 점착 테이프의 인장 강도가 100MPa 내지 500MPa이고, 충격 강도가 0.7mJ 내지 2.0mJ인디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 제1 아크릴계 점착층, 상기 아크릴계 발포층 및 상기 제2 아크릴계 점착층 각각은 별도의 착색제를 포함하지 않는디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 흑색층의 두께가 0.1㎛ 내지 5㎛이고, 광투과율이 4.0% 이하인디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 흑색층은 흑색 착색제를 10 중량% 내지 80 중량%로 포함하는디스플레이용 양면 점착 테이프.
- 제4항에 있어서,상기 흑색 착색제는 카본 블랙계 착색제, 흑연계 착색제, 산화철계 착색제, 안트라퀴논계 착색제, 산화코발트계 착색제, 산화구리계 착색제, 망간계 착색제, 산화 안티몬계 착색제, 산화 니켈계 착색제 및 이들의 조합으로 이루어진 군에서 선택된 적어도 하나를 포함하는디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 아크릴계 발포층은 기공의 평균 크기가 20㎛ 내지 200㎛이고, 기공률이 1%내지 40%인디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 제1 아크릴계 점착층 및 상기 제2 아크릴계 점착층 각각의 점착력이 2,350g/in 내지 4,000g/in인디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 아크릴계 발포층은 발포용 조성물에 대하여 UV 조사 및 열 처리 중 어느 하나, 또는 순차적으로 UV 조사 및 열 처리를 모두 수행하여 형성하거나; 또는 발포용 조성물에 대하여 기체를 주입하면서 UV 조사를 수행하여 형성하는디스플레이용 양면 점착 테이프
- 제9항에 있어서,상기 UV 조사는 500mJ/cm2 내지 2,500mJ/cm2의 UV 조사량으로 수행하는디스플레이용 양면 점착 테이프
- 제9항에 있어서,상기 아크릴계 발포층은 아크릴계 중합체 및 기공형성용 필러를 포함하는 발포용 조성물에 대하여 UV 조사 및 열 처리 중 어느 하나, 또는 순차적으로 UV 조사 및 열 처리를 모두 수행하여 형성하거나; 또는 아크릴계 중합체를 포함하고 기공형성용 필러를 포함하지 않는 발포용 조성물에 대하여 기체를 주입하면서 UV 조사를 수행하여 형성하며,상기 기공형성용 필러는 상기 아크릴계 중합체 100 중량부에 대하여 0.1 중량부 내지 10 중량부로 포함되고,상기 기체는 0.001(cubic feet per minute, CFM) 내지 0.05CFM의 유량으로 주입되는디스플레이용 양면 점착 테이프.
- 제11항에 있어서,상기 아크릴계 중합체는 알킬 (메타)아크릴레이트계 모노머 및 극성 관능기 함유 모노머를 포함하는 공중합성 모노머 성분이 중합되어 형성되고,상기 아크릴계 중합체를 형성하는 상기 알킬 (메타)아크릴레이트계 모노머 대 상기 극성 관능기 함유 모노머의 중량비가 9:1 내지 7:3인디스플레이용 양면 점착 테이프.
- 제1항에 있어서,상기 제2 아크릴계 점착층의 상기 열가소성 플라스틱 필름층이 적층된 면의 반대면 상에 이형층을 더 포함하는디스플레이용 양면 점착 테이프.
- 열가소성 필름층의 적어도 일면에 흑색층을 형성하는 단계;아크릴계 발포층을 형성하는 단계;상기 적어도 일면에 흑색층이 형성된 열가소성 플라스틱 필름층 및 상기 아크릴계 발포층을 적층하여 적층체를 형성하는 단계;상기 적층체의 양면에 아크릴계 점착층을 형성하여, 디스플레이용 양면 점착테이프를 제조하는 단계;를 포함하는 디스플레이용 양면 점착 테이프의 제조방법.
- 제14항에 있어서,상기 양면 점착 테이프의 인장 강도는 100MPa 내지 500MPa이 되고, 충격 강도는 0.7mJ 내지 2.0mJ이 되도록 제조하는디스플레이용 양면 점착 테이프의 제조방법.
- 제14항에 있어서,상기 흑색층을 형성하는 단계에서, 상기 흑색층의 두께는 0.1㎛ 내지 5㎛가 되고, 광투과율은 4.0% 이하가 되도록 형성하는디스플레이용 양면 점착 테이프의 제조방법.
- 제14항에 있어서,상기 흑색층을 형성하는 단계에서, 상기 흑색층은 흑색 착색제를 10 중량% 내지 80 중량%로 포함하도록 형성하는디스플레이용 양면 점착 테이프의 제조방법.
- 제14항에 있어서,상기 아크릴계 발포층 및 상기 아크릴계 점착층 모두에는 별도의 착색제를 포함시키지 않는디스플레이용 양면 점착 테이프의 제조방법.
- 제14항에 있어서,상기 아크릴계 발포층을 형성하는 단계에서, 발포용 조성물에 대하여 UV 조사 및 열 처리 중 어느 하나, 또는 순차적으로 UV 조사 및 열 처리를 수행하거나 또는, 발포용 조성물에 대하여 기체를 주입하면서 UV 조사를 수행하여, 상기 아크릴계 발포층을 형성하는디스플레이용 양면 점착 테이프의 제조방법.
- 제19항에 있어서,상기 아크릴계 발포층을 형성하는 단계에서, 상기 UV 조사는 500mJ/cm2 내지 2,500mJ/cm2의 UV 조사량으로 수행하는디스플레이용 양면 점착 테이프의 제조방법.
- 제14항에 있어서,상기 아크릴계 발포층은 아크릴계 중합체 및 기공형성용 필러를 포함하는 발포용 조성물에 대하여 UV 조사 및 열 처리 중 어느 하나, 또는 순차적으로 UV 조사 및 열 처리를 수행하거나 또는, 아크릴계 중합체를 포함하고 기공형성용 필러를 포함하지 않는 발포용 조성물에 대하여 기체를 주입하면서 UV 조사를 수행하여 형성하며,상기 기공형성용 필러는 상기 아크릴계 중합체 100 중량부에 대하여 0.1 중량부 내지 10 중량부로 포함되고,상기 기체는 0.001(cubic feet per minute, CFM) 내지 0.05CFM의 유량으로 주입되는디스플레이용 양면 점착 테이프의 제조방법.
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