KR101665539B1 - Adhesive film for removing optical clear adhesives, preparing method of the same, and remove method of optical clear adhesives on touch screen panel - Google Patents

Abstract

The present invention relates to an adhesive film for removing an optical transparent adhesive, a manufacturing method of the adhesive film, and to a method for removing an optical transparent adhesive on a touch screen using the adhesive film. According to the present invention, an adhesive film for removing an optical transparent adhesive comprises: a first substrate which is a polyethyleneterephthalate (PET) releasing film; a second substrate which is a PET releasing film; and an adhesive layer arranged between the first substrate and the second substrate, and composed of an adhesive composition including an acrylate-based base resin, an acryl-based liquid rubber resin, a multi-functional crosslinker, a silane-based coupling agent, and a photoinitiator.

Description

Technical Field [0001] The present invention relates to an adhesive film for removing an optical transparent adhesive, a method for producing the same, and a method for removing an optical transparent adhesive on a touch screen using the adhesive film,

The present invention relates to a pressure-sensitive adhesive film for removing an optical transparent adhesive, a method for producing the pressure-sensitive adhesive film, and a method for removing an optical transparent adhesive in a touch screen using the pressure-sensitive adhesive film.

As the mobile phone touchscreen market grows, interest in adhesive materials used between mobile phone window glass and touchscreen panel sensor glasses is increasing. In a conventional touch screen panel, a touch screen panel (TSP) is attached to a film layer on which a sensing electrode is formed and a cover lens by applying a lamination process or the like by optically clear adhesive (OCA).

However, bubbles may be formed during the cementation process, foreign materials may be contained, and various causes of adhesion failure such as defective cementation position may occur. The industry estimates that there are more than 20% of loosely welded joints, although the figures vary somewhat depending on the product.

Thus, recent touch screen panel manufacturers are paying attention to reproducing expensive front windows (eg, tempered glass), ITO, and FPCB components.

Although the bonding method is somewhat different depending on the product, the optical transparent adhesive for bonding the front window and the ITO pattern film has a very strong adhesive property, so that it is very difficult to separate after the adhesion, It is very difficult to remove the transparent adhesive.

In this connection, Korean Patent Registration No. 1345762 discloses a method of reproducing a touch screen panel. However, in the case of the organic cleaning process in which the optical transparent adhesive is immersed in the organic cleaning agent to swell the adhesive component and remove it by a physical method as in the above-mentioned patent, damage to the front window or the like caused by the organic cleaning agent may be caused, The use of harmful organic solvents has the disadvantage of being harmful to the environment.

Accordingly, there is a demand for a method for easily removing an optical transparent adhesive remaining on a cover glass of a closed touch screen while reducing the use of an organic detergent.

The present invention provides a pressure-sensitive adhesive film for removing an optical transparent adhesive, a method for producing the pressure-sensitive adhesive film, and a method for removing an optical transparent adhesive on a touch screen using the pressure-sensitive adhesive film.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

The first aspect of the present application relates to an adhesive film which is adhered to an optical transparent adhesive and removes the optical transparent adhesive from an adherend, the adhesive film comprising: a first substrate; A second substrate facing the first substrate; And a pressure-sensitive adhesive layer formed between the first substrate and the second substrate, wherein the pressure-sensitive adhesive layer comprises 20 to 30 parts by weight of an acrylic liquid rubber resin, 100 parts by weight of a multifunctional crosslinking agent, , 0.60 to 0.65 parts by weight of a silane coupling agent, and 0.60 to 0.65 parts by weight of a photoinitiator, wherein the acrylic liquid rubber resin is at least one selected from the group consisting of n-butyl acrylate (BA), n-butyl methacrylate (BMA), acrylonitrile (AN), and glycidyl methacrylate (GMA), followed by photopolymerization with 1-hydroxy-cyclohexyl phenyl ketone as a photopolymerization initiator. Wherein the base material is a polyethylene terephthalate (PET) release film.

According to a second aspect of the present invention, there is provided a method for producing a photoresist composition, comprising: mixing and photopolymerizing an acrylate resin and a photopolymerization initiator to obtain an acrylate base resin; After mixing n-butyl acrylate (BA), n-butyl methacrylate (BMA), acrylonitrile (AN) and glycidyl methacrylate (GMA), 1-hydroxy-cyclohexyl Adding phenyl ketone and photopolymerization to obtain an acrylic liquid rubber resin; 20 to 30 parts by weight of the acrylic liquid rubber resin, 1.2 to 1.3 parts by weight of a polyfunctional crosslinking agent, 0.60 to 0.65 parts by weight of a silane coupling agent and 0.60 to 0.65 parts by weight of a photoinitiator are mixed with 100 parts by weight of the acrylate base resin And photopolymerizing to obtain a pressure-sensitive adhesive composition; Applying the pressure-sensitive adhesive composition obtained above to a first substrate, which is a polyethylene terephthalate (PET) release film, and then curing the film by ultraviolet rays to form a pressure-sensitive adhesive film.

According to a third aspect of the present invention, there is provided a method for manufacturing a touch screen, comprising the steps of: adhering an adhesive film for optical transparent adhesive removal according to the first aspect of the present invention to an optical transparent adhesive remaining on a cover glass surface of a closed touch screen; And pulling the adhesive film for removing the optical transparent adhesive to remove the optical transparent adhesive.

An optically clear adhesive (OCA) remaining on a cover glass of a closed touch screen can be easily removed using the adhesive film according to one embodiment of the present invention. In addition, by reducing the amount of the organic cleaning agent used in the past by about 80% or more, it is environmentally friendly, and it is possible to prevent damage of the cover glass, which is an adhesive, and is effective for activating the reuse of the waste touch screen.

In addition, by including the acrylic liquid rubber resin as the composition of the optical transparent adhesive adhesive film according to one embodiment of the present invention, an adhesive film having a tensile strength of about 0.6 MPa to about 2 MPa, an elongation of about 800% to about 1,500% is provided The removal efficiency of the optical transparent adhesive can be improved.

1 is a schematic view showing an adhesive film for removing optical transparent adhesive (OCA) according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms " about ", " substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) " or " step " used to the extent that it is used throughout the specification does not mean " step for.

Throughout this specification, the term " combination (s) thereof " included in the expression of the machine form means a mixture or combination of one or more elements selected from the group consisting of the constituents described in the expression of the form of a marker, Quot; means at least one selected from the group consisting of the above-mentioned elements.

Throughout this specification, the description of "A and / or B" means "A or B, or A and B".

The first aspect of the present application relates to an adhesive film which is adhered to an optical transparent adhesive and removes the optical transparent adhesive from an adherend, the adhesive film comprising: a first substrate; A second substrate facing the first substrate; And an adhesive layer formed between the first substrate and the second substrate, wherein the adhesive layer comprises a pressure-sensitive adhesive composition comprising an acrylate base resin, an acrylic liquid rubber resin, a silane coupling agent, and a polyfunctional crosslinking agent Wherein the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer.

In one embodiment of the invention, the adherend may include, but is not limited to, a closed touch screen. The reuse of the waste touch screen can be activated by removing the optical transparent adhesive using the adhesive film according to one embodiment of the present invention from the closed touch screen.

In this regard, FIG. 1 is a schematic view showing an adhesive film for optical transparent adhesive (OCA) removal according to an embodiment of the present invention. 1, an adhesive film according to an embodiment of the present invention includes a first substrate 100, a second substrate 300 disposed opposite to the first substrate 100, And an adhesive layer (200) formed between the second base material (300).

In one embodiment of the present invention, the first substrate and / or the second substrate are formed on the upper and / or lower portions of the adhesive layer to protect the adhesive layer, and any known plastic substrate film may be used without particular limitation And is preferably one or more selected from the group consisting of ester, ethylene, propylene, diacetate, triacetate, styrene, carbonate, methylpentene, sulfone, ether ethyl ketone, imide, fluorine, nylon, acrylate, , Or a polymer comprising a polymer selected from the group consisting of combinations, or copolymeric polymers, and more preferably, PET release film, but may not be limited thereto.

In one embodiment of the present invention, the adhesive layer comprises about 1 to about 30 parts by weight of an acrylic liquid rubber resin per 100 parts by weight of an acrylate base resin; From about 0.01 part to about 3 parts by weight of silane coupling agent; And about 0.005 parts by weight to about 10 parts by weight of the multifunctional crosslinking agent, but may not be limited thereto.

In one embodiment of the invention, the acrylate base resin is selected from the group consisting of methyl methacrylate, urethane acrylate, epoxy acrylate, silicone acrylate, ethylhexyl acrylate, butyl acrylate, ethyl acrylate, isobornyl acrylate, Acrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, glycidyl methacrylate, glycidyl acrylate, behenyl acrylate, ethyl acrylate, lauryl acrylate, stearyl acrylate, But are not limited to, those selected from the group consisting of hydroxyethyl methacrylate, phenoxy acrylate, methyl acrylate, hexanediol diacrylate, and combinations thereof. For example, the acrylate base resin may be selected from those having excellent tensile strength and elongation, and may be a solvent-free ultraviolet curable resin so as to improve the adhesive force of the adhesive film.

In one embodiment of the present invention, the molecular weight of the acrylate base resin may be from about 50 to about 3,000,000, but is not limited thereto. For example, the molecular weight of the acrylate base resin may range from about 50 to about 3,000,000, from about 50 to about 2,000,000, from about 50 to about 1,000,000, from about 50 to about 100,000, from about 50 to about 10,000, from about 50 to about 1,000, But it may be, but not limited to, about 50 to about 100.

In one embodiment of the invention, the acrylate base resin may be a partially cured or fully cured resin by photopolymerization, and preferably the viscosity of the acrylate base resin is from about 2,000 cps to about 7,000 cps But may not be limited thereto. For example, the viscosity of the acrylate base resin can be from about 2,000 cps to about 7,000 cps, from about 2,000 cps to about 6,500 cps, from about 2,000 cps to about 6,000 cps, from about 2,000 cps to about 5,000 cps, cps, from about 2,000 cps to about 4,500 cps, from about 2,000 cps to about 4,000 cps, from about 2,000 cps to about 3,500 cps, from about 2,000 cps to about 3,000 cps, or from about 2,000 cps to about 2,500 cps, But may be, but not limited to, from about 2,500 cps to about 4,500 cps. For example, when the viscosity of the acrylate base resin is less than 2,000 cps, syrup (adhesive composition) may flow during film coating, and when the viscosity of the acrylate base resin is more than about 7,000 cps, .

In one embodiment of the invention, the acrylic liquid rubber resin is selected from the group consisting of n-butyl acrylate, n-butyl methacrylate, acrylonitrile, glycidyl methacrylate, and combinations thereof But is not limited thereto. For example, when the acrylic liquid rubber resin is contained in the adhesive layer, the tensile strength, elongation, and elasticity of the adhesive film for removing an optical transparent adhesive are improved by the acrylic liquid rubber resin, Can be improved.

In one embodiment of the present invention, the acrylic liquid rubber resin may be a partially cured or fully cured resin by photopolymerization, and preferably the viscosity of the acrylic liquid rubber resin is about 1,000 cps to about 8,000 cps , But may not be limited thereto. For example, the viscosity of the acrylic liquid rubber resin may be from about 1,000 cps to about 8,000 cps, from about 1,000 cps to about 7,000 cps, from about 1,000 cps to about 6,000 cps, from about 1,000 cps to about 5,000 cps , From about 1,000 cps to about 4,000 cps, from about 1,000 cps to about 3,000 cps, or from about 1,000 cps to about 2,000 cps, and preferably from about 2,000 cps to about 5,000 cps, have. For example, if the viscosity of the acrylic liquid rubber resin is less than about 2,000 cps, the elasticity and tensile strength may not be improved. If the acrylic liquid rubber resin has a viscosity of about 5,000 cps or more, tensile strength and elasticity It may become too strong and the use may be restricted.

In one embodiment of the present invention, the acrylic liquid rubber resin may be included in an amount of about 1 part by weight to about 30 parts by weight with respect to 100 parts by weight of the acrylate base resin, but the present invention is not limited thereto. For example, the acrylic liquid rubber resin may be present in an amount of from about 1 part by weight to about 30 parts by weight, from about 5 parts by weight to about 30 parts by weight, from about 10 parts by weight to about 30 parts by weight, based on 100 parts by weight of the acrylate base resin About 15 parts by weight to about 30 parts by weight, about 20 parts by weight to about 30 parts by weight, or about 25 parts by weight to about 30 parts by weight, preferably about 15 parts by weight to about 20 parts by weight But may be, but not limited to. For example, when the acrylic liquid rubber resin is contained in an amount of less than about 20 parts by weight based on 100 parts by weight of the acrylate base resin, improvement in tensile strength and elasticity can not be obtained, If it exceeds the above amount, the tensile strength and elasticity become too strong, which may result in restrictions on use.

In one embodiment of the invention, the silane coupling agent is selected from the group consisting of? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethyldiethoxysilane,? -Glycidoxypropyltriethoxysilane, 3- Vinyltrimethoxysilane, vinyltriethoxysilane,? -Methacryloxypropyltrimethoxysilane,? -Methacryloxypropyltriethoxysilane,? -Aminopropyltrimethoxysilane,? -Methacryloxypropyltrimethoxysilane,? -Methacryloxypropyltrimethoxysilane, but are not limited to, those selected from the group consisting of γ-aminopropyltriethoxysilane, 3-isocyanate propyltriethoxysilane, γ-acetoacetate propyltrimethoxysilane, and combinations thereof . For example, the silane-based coupling agent improves the adsorptivity and adhesion of the adhesive film, thereby effectively removing the residue of the optical transparent adhesive.

In one embodiment of the present invention, the silane coupling agent may be included in an amount of about 0.01 part by weight to about 3 parts by weight based on 100 parts by weight of the acrylate base resin, but the present invention is not limited thereto. For example, about 100 parts by weight of the acrylate base resin, the silane coupling agent may be present in an amount of about 0.01 to about 3 parts by weight, about 0.01 to about 2 parts by weight, about 0.01 to about 1 part by weight About 0.01 parts by weight to about 0.1 parts by weight, about 0.1 parts by weight to about 3 parts by weight, about 1 part by weight to about 3 parts by weight, or about 2 parts by weight to about 3 parts by weight, May be from about 0.1 part by weight to about 1 part by weight, but the present invention is not limited thereto. For example, when the silane-based coupling agent is contained in an amount of less than about 0.01 part by weight based on 100 parts by weight of the acrylate base resin, the adhesiveness and adhesion of the adhesive film can not be improved. If it is contained in an amount of more than about 3 parts by weight, the adsorptivity and adhesiveness may be deteriorated.

In one embodiment of the present invention, the polyfunctional crosslinking agent may be selected from the group consisting of polyenes monomers, polythiol monomers, polyfunctional (meth) acrylates, and combinations thereof. . For example, the polyfunctional crosslinking agent may be one for improving the tensile strength and elongation of the pressure-sensitive adhesive layer, and improving the degree of crosslinking between the compounds contained in the pressure-sensitive adhesive composition. When a monofunctional crosslinking agent is used as the crosslinking agent, the optical transparent adhesive removing function can not be exerted. In one embodiment of the invention, the multifunctional crosslinking agent is selected from the group consisting of triallyl isocyanurate, diaryl maleate, trimethylolpropane tris-thiopropionate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetra Ethylene glycol diacrylate, ethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylol propane diacrylate, trimethylol propane triacrylate, trimethylol propane Dimethacrylate, trimethylolpropane trimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol di Methacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol trimethacrylate, pen Triacrylate of urethane acrylate, urethane acrylate, urethane acrylate, urea acrylate, urea acrylate, urethane acrylate, urea acrylate, urethane acrylate, urethritol tetramethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexa methacrylate, But are not limited to, those selected from the group consisting of, and combinations thereof.

In one embodiment of the present invention, the amount of the polyfunctional crosslinking agent included in the adhesive composition may be controlled to control the tensile strength and elongation of the adhesive film according to one embodiment of the present invention. In one embodiment of the present invention, the polyfunctional crosslinking agent may be included in an amount of about 0.005 part by weight to about 10 parts by weight based on 100 parts by weight of the acrylate base resin, but the present invention is not limited thereto. For example, with respect to 100 parts by weight of the acrylate base resin, the polyfunctional crosslinking agent may be used in an amount of from about 0.005 part to about 10 parts, from about 0.005 to about 5 parts, from about 0.005 part to about 1 part, From about 0.005 part to about 0.1 part, from about 0.005 part to about 0.01 part, from about 0.01 part to about 10 parts, from about 0.1 part to about 10 parts, from about 1 part to about 10 parts, May be included in an amount of about 5 parts by weight to about 10 parts by weight, preferably about 0.01 parts by weight to about 5 parts by weight, but the present invention is not limited thereto. For example, when the polyfunctional crosslinking agent is contained in an amount of less than about 0.005 part by weight based on 100 parts by weight of the acrylate base resin, an effect of improving tensile strength and elongation can not be expected, and the polyfunctional crosslinking agent is contained in an amount exceeding about 10 parts by weight , The tensile strength and elongation can be rather lowered.

In one embodiment of the invention, the adhesive composition comprises, based on 100 parts by weight of the acrylate base resin, from the group consisting of a plasticizer, an ultraviolet absorber, an antifoam, an antioxidant, a colorant, a filler, a surfactant, But may also be, but not limited to, from 0.001 to 1 part by weight of the additive selected.

In one embodiment of the present invention, the adhesive composition may further include about 0.001 part by weight to about 1 part by weight of the ultraviolet absorbent per 100 parts by weight of the acrylate base resin, but the present invention is not limited thereto. For example, when the ultraviolet absorber is further included in the adhesive composition, it may prevent the yellowing of the surface of the adhesive film after curing within the above range, thereby improving the optical stability of the adhesive film. For example, the ultraviolet absorber may be selected from the group consisting of benzotriazole-based, benzophenone-based, triazine-based, and combinations thereof, but is not limited thereto. Preferably, A benzotriazole-based ultraviolet absorber can be used. For example, the ultraviolet absorber may be a linear or branched (for example, 7 to 9) 3- (2H-benzotriazol-2-yl) -5- (1,1-dimethylethyl) 4- 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, an alkyl ester of 2- (benzotriazol-2-yl) -4- (2,4,4- Sol, 2- [2'-hydroxy-3 ', 5'-bis (?,? - dimethylbenzyl) phenyl] benzotriazole, 2- -Butylphenyl) benzotriazole, 2,4-hydroxybenzophenone, 2,4-hydroxy-4-methoxybenzophenone, 2,4-hydroxy-4-methoxybenzophenone- , 4-diphenyl-6- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2,4- ) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-propoxyphenyl) -1,3,5-triazine, 2,4- - (2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, and combinations thereof. However, the present invention is not limited thereto.

In one embodiment of the present invention, the adhesive composition may further include about 0.001 part by weight to about 1 part by weight of an antioxidant based on 100 parts by weight of the acrylate base resin, but the present invention is not limited thereto. For example, when the antioxidant is further included in the pressure-sensitive adhesive composition, it is possible to prevent the pressure-sensitive adhesive film from aging after curing within the above range, and exhibit excellent thermal stability. Specifically, the antioxidant may prevent the oxidation of the pressure-sensitive adhesive composition and improve the thermal stability. For example, the antioxidant may include, but is not limited to, those selected from the group consisting of phenolic compounds, quinone compounds, amine compounds, phosphite compounds, and combinations thereof. For example, the antioxidant may be selected from the group consisting of pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), tris (2,4- Phenyl) phosphite, and combinations thereof. The term " anionic "

In one embodiment of the present invention, the viscosity of the adhesive layer may be from about 2,000 cps to about 7,000 cps, but is not limited thereto. For example, the viscosity of the adhesive layer can be from about 2,000 cps to about 7,000 cps, from about 2,000 cps to about 6,500 cps, from about 2,000 cps to about 6,000 cps, from about 2,000 cps to about 5,000 cps, at about room temperature (about 25 ° C) And may be from about 2,000 cps to about 4,500 cps, from about 2,000 cps to about 4,000 cps, from about 2,000 cps to about 3,500 cps, from about 2,000 cps to about 3,000 cps, or from about 2,000 cps to about 2,500 cps, To about 4,500 cps, although it is not limited thereto. By controlling the viscosity of the pressure-sensitive adhesive layer within the above range, it is possible to effectively maintain process efficiency and physical properties after curing. For example, when the viscosity of the adhesive layer is less than about 2,000 cps, the applicability may be good, but it may not be easy to form a thick film, and when the viscosity of the adhesive layer exceeds about 7,000 cps, So that it may be difficult to form a uniform film.

In one embodiment of the invention, the thickness of the adhesive layer may be from about 100 [mu] m to about 300 [mu] m, but is not limited thereto. For example, the thickness of the adhesive layer may be in the range of from about 100 microns to about 300 microns, from about 100 microns to about 250 microns, from about 100 microns to about 200 microns, from about 100 microns to about 150 microns, from about 150 microns to about 300 microns, From about 200 microns to about 300 microns, or from about 250 microns to about 300 microns, and preferably from about 150 microns to about 200 microns, but may not be limited thereto. For example, when the thickness of the adhesive layer is less than about 100 占 퐉, the tensile strength and elongation of the adhesive film may be weakened and the adhesive film may be broken or torn. When the thickness of the adhesive layer is more than about 300 占 퐉, The strength is too strong and the adherend (cover glass) may be broken.

The tensile strength of the adhesive film for removing optical transparent adhesive according to an embodiment of the present invention may be about 0.6 MPa to about 2 MPa, and the elongation may be about 800% to about 1,500%. When the tensile strength and the elongation of the pressure sensitive adhesive film for removing optical transparent adhesive each include the above range, the adhesive force of the pressure sensitive adhesive film is excellent and damage to the adherend is minimized. The adhesive film can be effectively used when it is adhered to an adherend which is not easy to handle, such as a cover glass of a closed touch screen.

According to a second aspect of the present invention, there is provided a method for producing a photoresist composition, comprising: mixing and photopolymerizing an acrylate resin and a photopolymerization initiator to obtain an acrylate base resin; Mixing the acrylic liquid rubber and the photopolymerization initiator and photopolymerizing them to obtain an acrylic liquid rubber resin; Based on 100 parts by weight of the acrylate base resin, about 1 part by weight to about 30 parts by weight of the acrylic liquid rubber resin; From about 0.01 part to about 3 parts by weight of silane coupling agent; And about 0.005 parts by weight to about 10 parts by weight of the multifunctional crosslinking agent are mixed and photopolymerized to obtain a pressure-sensitive adhesive composition; And a step of coating the obtained pressure-sensitive adhesive composition on a first substrate and ultraviolet curing the pressure-sensitive adhesive composition to form a pressure-sensitive adhesive film.

Although the detailed description of the method of manufacturing the pressure-sensitive adhesive film for optical transparent adhesive removal according to the second aspect of the present invention is omitted for the sake of simplicity and clarity of description of the first aspect of the present invention, The contents can be equally applied to the second aspect of the present invention.

In one embodiment of the present invention, after the step of forming the pressure-sensitive adhesive film, the step of attaching the release-treated second base material to the back surface of the first base material may be additionally included but may not be limited thereto.

In one embodiment of the invention, the acrylic liquid rubber resin is selected from the group consisting of n-butyl acrylate, n-butyl methacrylate, acrylonitrile, glycidyl methacrylate, and combinations thereof But is not limited thereto.

In one embodiment of the invention, the adhesive composition comprises, based on 100 parts by weight of the acrylate base resin, from the group consisting of a plasticizer, an ultraviolet absorber, an antifoam, an antioxidant, a colorant, a filler, a surfactant, But may also be, but not limited to, from 0.001 to 1 part by weight of the additive selected.

According to a third aspect of the present invention, there is provided a method for manufacturing a touch screen, comprising the steps of: adhering an adhesive film for optical transparent adhesive removal according to the first aspect of the present invention to an optical transparent adhesive remaining on a cover glass surface of a closed touch screen; And pulling the adhesive film for removing the optical transparent adhesive to remove the optical transparent adhesive.

Although the detailed description of the method of removing the optical transparent adhesive of the closed touch screen according to the third aspect of the present application is omitted for the description of the parts overlapping with the first aspect and the second aspect of the present invention, The aspects described in the side and second aspects are equally applicable to the second aspect of the present application.

In one embodiment of the present invention, the adhesive film may be adhered to face the optical transparent adhesive, laminated at a pressure of about 1 kgf / cm to about 5 kgf / cm, and then left at room temperature , But may not be limited thereto.

In one embodiment of the present disclosure, an adhesive composition is provided that exhibits an excellent tensile strength of from about 0.6 MPa to about 2 MPa, an elongation of from about 800% to about 1,500%, to remove the optical transparent adhesive remaining on the cover glass surface of the closed- By using the adhesive film for removing an optical transparent adhesive according to the first aspect of the present application, the optical transparent adhesive can be eco-friendly and easily removed. In addition, it is effective to prevent the cover glass from being damaged and to activate the reuse of the closed touch screen.

Hereinafter, embodiments and examples of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments and examples and drawings.

[ Example ]

Manufacturing example  1: part Light-cured Acrylate series  Preparation of base resin

60 parts by weight of ethylhexyl acrylate (EHA), 30 parts by weight of isobornyl acrylate (IBOA) and 10 parts by weight of 2-hydroxyethyl acrylate (HEA) were added to a reactor capable of nitrogen gas refluxing and photopolymerization , 0.5 parts by weight of 1-hydroxy-cyclohexyl phenyl ketone (manufactured by BASF, Irgacure 184) as a photopolymerization initiator, and the mixture was photopolymerized for 30 minutes. Then, oxygen was injected into the reactor to inactivate the initiator to terminate the reaction to obtain an acrylate base resin having a viscosity of 2,500 cps. At this time, the molecular weight of the obtained acrylate base resin was 1,000,000.

Manufacturing example  2: Preparation of acrylic liquid rubber resin

60 parts by weight of n-butyl acrylate (BA), 30 parts by weight of n-butyl methacrylate (BMA), 5 parts by weight of acrylonitrile (AN), 5 parts by weight of glycidyl methacrylate Acrylate (GMA) were mixed and 0.5 parts by weight of 1-hydroxy-cyclohexyl phenyl ketone (manufactured by BASF, Irgacure 184) as a photopolymerization initiator was added and photopolymerized for 30 minutes. Then, oxygen was injected into the reactor to inactivate the initiator to terminate the reaction to obtain an acrylic liquid rubber resin having a viscosity of 2,500 cps.

Example  One

95 parts by weight of the acrylate base resin obtained in Preparation Example 1, 5 parts by weight of the acrylic liquid rubber resin obtained in Preparation Example 2, 1 part by weight of 1,4-butanediol dimethacrylate as the polyfunctional crosslinking agent, 0.5 part by weight of 3-isocyanatopropyltriethoxysilane as a coupling agent, and 0.5 part by weight of 2,2-dimethoxy-1,2-diphenylethan-1 -one (manufactured by BASF, IGACURE 651)] were mixed and UV-polymerized to prepare a resin composition, and a resin coating solution having a viscosity of 4,000 cps to 4,500 cps was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Example  2

90 parts by weight of the acrylate base resin obtained in Preparation Example 1, 10 parts by weight of the acrylic liquid rubber resin obtained in Preparation Example 2, 1 part by weight of 1,4-butanediol dimethacrylate as the polyfunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a coupling agent and 0.5 part by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition. Using this resin composition, a resin having a viscosity of 4,000 cps to 4,500 cps Coating solution was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Example  3

85 parts by weight of the acrylate base resin obtained in Preparation Example 1, 15 parts by weight of the acrylic liquid rubber resin obtained in Preparation Example 2, 1 part by weight of 1,4-butanediol dimethacrylate as the polyfunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a coupling agent and 0.5 part by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition. Using this resin composition, a resin having a viscosity of 4,000 cps to 4,500 cps Coating solution was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Example  4

80 parts by weight of the acrylate base resin obtained in Preparation Example 1, 20 parts by weight of the acrylic liquid rubber resin obtained in Preparation Example 2, 1 part by weight of 1,4-butanediol dimethacrylate as the polyfunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a coupling agent and 0.5 part by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition. Using this resin composition, a resin having a viscosity of 4,000 cps to 4,500 cps Coating solution was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Example  5

75 parts by weight of the acrylate base resin obtained in Preparation Example 1, 25 parts by weight of the acrylic liquid rubber resin obtained in Preparation Example 2, 1 part by weight of 1,4-butanediol dimethacrylate as the polyfunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a coupling agent and 0.5 part by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition. Using this resin composition, a resin having a viscosity of 4,000 cps to 4,500 cps Coating solution was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Example  6

70 parts by weight of the acrylate base resin obtained in Preparation Example 1, 30 parts by weight of the acrylic liquid rubber resin obtained in Preparation Example 2, 1 part by weight of 1,4-butanediol dimethacrylate as the polyfunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a coupling agent and 0.5 part by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition. Using this resin composition, a resin having a viscosity of 4,000 cps to 4,500 cps Coating solution was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Comparative Example  One

100 parts by weight of the acrylate base resin obtained in Preparation Example 1, 1 part by weight of 1,4-butanediol dimethacrylate as a multifunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a silane coupling agent, And 0.5 parts by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition, and a resin coating solution having a viscosity of 4,000 cps to 4,500 cps was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Comparative Example  2

80 parts by weight of the acrylate base resin obtained in Preparation Example 1, 20 parts by weight of an acrylic liquid rubber resin (Kuraray UC-102M), 1 part by weight of 1,4-butanediol dimethacrylate as a multifunctional crosslinking agent, 0.5 part by weight of 3-isocyanate propyltriethoxysilane as a coupling agent and 0.5 part by weight of IGACURE 651 manufactured by BASF as a photoinitiator were mixed and UV-polymerized to prepare a resin composition. Using this resin composition, a resin having a viscosity of 4,000 cps to 4,500 cps Coating solution was prepared.

The thus-prepared resin coating solution was coated to a thickness of 75 탆 on a polyethylene terephthalate (PET) film having a thickness of 75 탆 and cured by UV irradiation for 3 minutes using a UV curing machine, (PET) film to a thickness of 38 탆 to prepare an OCA removing film.

Experimental Example  1: tensile strength and Elongation  Measure

The tensile strength and elongation of the OCA-removed films prepared in Examples 1 to 6 and Comparative Examples 1 and 2 were measured using a universal material tester (LLOYD INSTRUMENT LR30K PLUS). The results are shown in Table 1 Respectively.

As a result of the experiment, it was confirmed that the strength and peel strength of the film can be controlled by using the acrylate base resin and the acrylic liquid rubber resin. In the case of Examples 1 to 6, the high tensile strength It was confirmed that the intensity appeared.
As a result of the test, it was confirmed that the tensile strength was improved by adding the acrylic liquid rubber resin according to the present example. In the case of Comparative Example 2 using the general liquid rubber resin (Kuraray UC-102M), not only the tensile strength but also the elongation And it was confirmed that it appeared low. In the case of Comparative Example 2, the tensile strength was as low as about 0.88, so that it could not be used as an OCA removing film.

Acrylate base resin Acrylic liquid rubber resin Multifunctional crosslinking agent Silane coupling agent Photoinitiator The tensile strength
(Mpa) Elongation
(%) Peel force
(g / 25 mm) Example 1 95 5 (Preparation Example 2) One 0.5 0.5 1.21 920 3.280 Example 2 90 10 (Preparation Example 2) One 0.5 0.5 1.25 960 3,190 Example 3 85 15 (Preparation Example 2) One 0.5 0.5 1.31 1,020 3,120 Example 4 80 20 (Preparation Example 2) One 0.5 0.5 1.48 1,140 3,070 Example 5 75 25 (Preparation Example 2) One 0.5 0.5 1.63 920 2,720 Example 6 70 30 (Preparation Example 2) One 0.5 0.5 1.71 810 2,650 Comparative Example 1 100 - One 0.5 0.5 1.20 1,020 3,350 Comparative Example 2 80 20 (UC-102M) One 0.5 0.5 0.88 870 3,500

Experimental Example  2: Peel force  Measure

The OCA removal films prepared in Examples 1 to 6 and Comparative Examples 1 and 2 were adhered to a SUS surface and lapped at a pressure of 2 kgf / cm and left at room temperature for 30 minutes. The peeling speed was 300 mm / min and the 180 degree peel force on the substrate at 25 캜 was measured.

As a result of the tests, Examples 5 and 6 had a disadvantage in that the tensile strength was high but the elongation and peeling strength were low.

Experimental Example  3: OCA Removal power  Measure

After attaching the OCA removal film to the cover glass, the PET release film was removed after laminating at a pressure of 2 kgf / cm. Then, OCA removal film was pulled to remove OCA, and OCA removability was measured.

Acrylate base resin Acrylic liquid rubber resin Multifunctional crosslinking agent Silane coupling agent Photoinitiator OCA removal (100 criteria) Example 1 95 5 (Preparation Example 2) One 0.5 0.5 80 Example 2 90 10 (Preparation Example 2) One 0.5 0.5 80 Example 3 85 15 (Preparation Example 2) One 0.5 0.5 81 Example 4 80 20 (Preparation Example 2) One 0.5 0.5 89 Example 5 75 25 (Preparation Example 2) One 0.5 0.5 78 Example 6 70 30 (Preparation Example 2) One 0.5 0.5 68 Comparative Example 1 100 - One 0.5 0.5 83 Comparative Example 2 80 20 (UC-102M) One 0.5 0.5 0

From the results shown in Table 2, it can be seen that the OCA-removing film has an increased tensile strength and elongation by increasing the degree of crosslinking using the acrylic liquid rubber resin according to the present invention, as in Examples 1 to 6, there was. However, if the tensile strength is low as in Comparative Example 2, it can be confirmed that the film is broken or torn after cover glass laminating and can not have OCA removing ability.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: first substrate
200: adhesive layer
300: second substrate

Claims (15)

An adhesive film adhered to an optical transparent adhesive to remove the optical transparent adhesive from an adherend,
A first substrate;
A second substrate facing the first substrate; And
And an adhesive layer formed between the first substrate and the second substrate,
Wherein the adhesive layer comprises 20 to 30 parts by weight of an acrylic liquid rubber resin, 1.2 to 1.3 parts by weight of a multifunctional crosslinking agent, 0.60 to 0.65 parts by weight of a silane coupling agent, 0.60 to 0.65 weight of a photoinitiator And a pressure-sensitive adhesive layer,
The acrylic liquid rubber resin was prepared by mixing n-butyl acrylate (BA), n-butyl methacrylate (BMA), acrylonitrile (AN) and glycidyl methacrylate (GMA) - hydroxy-cyclohexyl phenyl ketone,
Wherein the first base material and the second base material are polyethylene terephthalate (PET) release films.
The method according to claim 1,
The pressure-sensitive adhesive layer was composed of a pressure-sensitive adhesive composition comprising 25 parts by weight of an acrylic liquid rubber resin, 1.25 parts by weight of a polyfunctional crosslinking agent, 0.63 part by weight of a silane coupling agent, and 0.63 part by weight of a photoinitiator, based on 100 parts by weight of an acrylate base resin Characterized in that the pressure-sensitive adhesive film is an adhesive film for removing an optical transparent adhesive.
3. The method of claim 2,
The acrylic liquid rubber resin was prepared by mixing 60 parts by weight of n-butyl acrylate (BA), 30 parts by weight of n-butyl methacrylate (BMA), 5 parts by weight of acrylonitrile (AN), 5 parts by weight of glycidyl methacrylate (GMA) And 0.5 part by weight of 1-hydroxy-cyclohexyl phenyl ketone as a photopolymerization initiator, and the mixture is photopolymerized for 30 minutes.
The method of claim 3,
Wherein the acrylic liquid rubber resin is partially cured or completely cured by photopolymerization.
5. The method of claim 4,
Wherein the acrylic liquid rubber resin has a viscosity in the range of 2,000 cps to 5,000 cps.
6. The method according to any one of claims 1 to 5,
Wherein the object to be adhered comprises a closed touch screen.
The method according to claim 1,
The acrylate base resin is prepared by mixing ethylhexyl acrylate (EHA), isobornyl acrylate (IBOA), and 2-hydroxyethyl acrylate (HEA), and then 1-hydroxy-cyclohexylphenyl Ketone is added and photopolymerization is carried out.
delete delete delete Mixing and polymerizing an acrylate resin and a photopolymerization initiator to obtain an acrylate base resin;
After mixing n-butyl acrylate (BA), n-butyl methacrylate (BMA), acrylonitrile (AN) and glycidyl methacrylate (GMA), 1-hydroxy-cyclohexyl Adding phenyl ketone and photopolymerization to obtain an acrylic liquid rubber resin;
20 to 30 parts by weight of the acrylic liquid rubber resin, 1.2 to 1.3 parts by weight of the polyfunctional crosslinking agent, 0.60 to 0.65 parts by weight of the silane coupling agent and 0.60 to 0.65 parts by weight of the slagging agent are added to 100 parts by weight of the acrylate base resin Mixing and photopolymerizing to obtain a pressure-sensitive adhesive composition;
Coating the obtained pressure-sensitive adhesive composition on a first substrate, which is a polyethylene terephthalate (PET) release film, and ultraviolet curing the pressure-sensitive adhesive composition to form a pressure-sensitive adhesive film.
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