KR101596212B1 - Adhesive film for removing optical clear adhesives, method for preparing the same, and remove method of optical clear adhesives on touch screen panel - Google Patents
Adhesive film for removing optical clear adhesives, method for preparing the same, and remove method of optical clear adhesives on touch screen panel Download PDFInfo
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- KR101596212B1 KR101596212B1 KR1020150060216A KR20150060216A KR101596212B1 KR 101596212 B1 KR101596212 B1 KR 101596212B1 KR 1020150060216 A KR1020150060216 A KR 1020150060216A KR 20150060216 A KR20150060216 A KR 20150060216A KR 101596212 B1 KR101596212 B1 KR 101596212B1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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Abstract
The present invention relates to a pressure-sensitive adhesive film which is adhered to an optical transparent adhesive (OCA) to remove OCA from an adherend and a method for producing the same, and is characterized in that on the base material, an acrylate base resin, a silane-based coupling agent, And a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing an additive. The OCA remaining on the cover glass of the lung touch screen can be transferred to the pressure sensitive adhesive film of the present invention to be cleanly removed, and the damage of the cover glass as the cover can be prevented, which is very effective in activating the recycling of the waste touch screen.
Description
The present invention relates to a pressure-sensitive 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 same.
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 touch screen panel (TSP) having a conventional touch screen structure, the film layer and the cover lens having the sensing electrodes formed thereon are attached to each other by applying a lamination process or the like using a transparent adhesive layer of OCA (optically clear adhesive film).
However, various kinds of adhesion failures such as bubbles, foreign matters, defective bonding position, etc. occur during the cementation process. The industry estimates that there are more than 20% of loosely welded joints, although the figures vary somewhat depending on the product.
Accordingly, touch screen panel manufacturers are interested in playing 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.
An object of the present invention is to provide an adhesive film for removing an optical transparent adhesive which can effectively remove an optical transparent adhesive (OCA) on the surface of a cover glass during a closed touch screen reproducing process.
It is still another object of the present invention to provide a method for producing an adhesive film for removing an optical transparent adhesive.
It is still another object of the present invention to provide a method for removing an optical transparent adhesive from a touch screen using an adhesive film for removing an optical transparent adhesive.
One aspect of the present invention relates to an adhesive film for removing an optical transparent adhesive which is attached to an optical transparent adhesive (OCA) to remove OCA from an adherend.
In one example, 0.01 to 3 parts by weight of a silane-based coupling agent is added to 100 parts by weight of an acrylate base resin; 0.005 to 10 parts by weight of a polyfunctional crosslinking agent; And an additive of a residual amount can be formed on the pressure-sensitive adhesive layer.
In one example, the acrylate base resin may have a viscosity at 25 DEG C of from 2000 cps to 7000 cps.
In one example, the adhesive composition may have a viscosity at 25 占 폚 of 2500 cps to 4500 cps.
In one example, the thickness of the adhesive layer may be 50 to 300 mu m.
In one example, the tensile strength of the pressure-sensitive adhesive film for removing an optical transparent adhesive may be 0.6 to 2 MPa and the elongation may be 800 to 1500%.
In one example, the adherend may be a closed touch screen.
Another aspect of the present invention is a method for producing an adhesive film for removing an optical transparent adhesive comprising the steps of:
A solvent-free ultraviolet curable acrylate resin and a photopolymerization initiator, followed by photopolymerization in whole or in part to obtain an acrylate based resin;
The obtained acrylate base resin; Multifunctional crosslinking agents; Silane coupling agents; A photopolymerization initiator; And at least one additive selected from a plasticizer, an ultraviolet absorber, a defoaming agent, an antioxidant, a colorant, a filler, a surfactant, and a mixture thereof;
A curing step of applying the obtained pressure-sensitive adhesive composition on a first base material and ultraviolet curing the same;
In one example, after the curing step, a step of attaching a release-treated second base material to the first base material and the non-attached surface may be further included.
In one example, the solvent-free ultraviolet curable acrylate resin is at least one member selected from the group consisting of methylmethacrylate, methyl methacrylate, urethane acrylate, epoxy acrylate, silicone acrylate, ethylhexyl acrylate, butyl acrylate, ethyl acrylate, isobornyl Acrylate, cyclohexyl methacrylate, glycidyl methacrylate, glycidyl acrylate, behenyl acrylate, ethyl acrylate, lauryl acrylate, stearyl acrylate, acrylic acid, hydroxyethyl acrylate, Hydroxyethyl methacrylate, phenoxy acrylate, methyl acrylate, hexanediol diacrylate, and mixtures thereof. [0033] The term " anionic surfactant "
In one example, the photopolymerization initiator is selected from the group consisting of benzophenone, N, N'-tetramethyl-4,4'-diaminobenzophenone (Michler's ketone), N, N'- Phenol, 4-methoxy-4'-dimethylaminobenzophenone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) Methyl-1- (4- (methylthio) phenyl) -2-morpholinopropanone-1,2,4-di Benzoin ethers such as benzoin methyl ether, benzoin ethyl ether and benzoin phenyl ether, benzoin ethers such as methyl benzoin and ethyl benzoin, and benzoin ethers such as methyl benzoate and ethyl benzoin. , Benzyldimethyl ketal and the like, benzyl derivatives such as 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di (m- ) Imidazole dimer, 2- (o-fluorophenyl) -4,5-phenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-diphenylimidazole dimer 2- (p-methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) -5-phenylimidazole dimer and 2- , 4-dimethoxyphenyl) -4,5-diphenylimidazole dimer and the like, 2,4-triarylimidazole dimer, 9-phenylacridine and 1,7-bis (9, (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, and a mixture thereof, may be used. .
In one example, the solvent-free ultraviolet curable acrylate resin comprises 30 to 60 parts by weight of ethylhexyl acrylate (EHA), 30 to 60 parts by weight of isobornyl acrylate (IBOA), 2 to 30 parts by weight of 2-hydroxyethyl acrylate ) 5 to 30 parts by weight.
In one example, the polyfunctional crosslinking agent is at least one selected from the group consisting of a polyene monomer, a polythiol monomer, a polyfunctional (meth) acrylate, and a mixture thereof, and a polyfunctional crosslinking agent 0.005 To 10 parts by weight may be added.
In one example, the coupling agent is selected from the group consisting of? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethyldiethoxysilane,? -Glycidoxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane , Vinyltrimethoxysilane, vinyltriethoxysilane,? -Methacryloxypropyltrimethoxysilane,? -Methacryloxypropyltriethoxysilane,? -Aminopropyltrimethoxysilane,? -Aminopropyltriethoxysilane,? -Aminopropyltrimethoxysilane, Isocyanate propyltriethoxysilane,? -Acetoacetate propyltrimethoxysilane, and mixtures thereof, and 0.01 to 3 parts by weight of a coupling agent is added to 100 parts by weight of the acrylate base resin .
Another aspect of the present invention is a method for removing an OCA of a closed touch screen including the steps of:
Attaching an adhesive film for optical transparent adhesive (OCA) so as to face OCA remaining on a cover glass surface of a closed touch screen;
Lidding at a pressure of 1 to 5 kgf / cm and standing at room temperature; And
A step of pulling out the adhesive film for optical transparent adhesive (OCA) removal.
According to the present invention, the OCA remaining on the cover glass of the closed touch screen can be transferred to the adhesive film of the present invention to be cleanly removed, and also the damage of the cover glass as the adhesive can be prevented. It is very effective.
Unless defined otherwise, all technical terms used in the present invention have the following definitions and are consistent with the meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Also, preferred methods or samples are described in this specification, but similar or equivalent ones are also included in the scope of the present invention. The contents of all publications referred to herein are incorporated herein by reference.
The term "about" is used herein to refer to a reference quantity, a level, a value, a number, a frequency, a percent, a dimension, a size, a quantity, a weight, or a length of 30, 25, 20, 25, 10, 9, 8, 7, Level, value, number, frequency, percent, dimension, size, quantity, weight or length of a variable, such as 4, 3, 2 or 1%.
Throughout this specification, the words "comprises" and "comprising ", unless the context requires otherwise, include the steps or components, or groups of steps or elements, Steps, or groups of elements are not excluded.
Optical transparent adhesive ( OCA ) Adhesive film for removal
An adhesive film for removing OCA from a surface of a cover glass of a closed touch screen, for example, an optical transparent adhesive (OCA) adhered to a cover glass obtained from a process for reproducing a closed touch screen, comprising: a substrate; And an adhesive layer formed by applying a predetermined adhesive composition on the substrate.
The base material is formed on the top and / or bottom of the OCA adhesive layer to protect the adhesive layer, and a known plastic base film can be used without limitation, and preferable examples include ester, ethylene, propylene, diacetate, triacetate, styrene , A polymer or a copolymer comprising at least one selected from the group consisting of a carbonate, a methylpentene, a sulfone, an ether ethyl ketone, an imide, a fluorine, a nylon, an acrylate and an alicyclic olefin as a constituent unit, A release film can be used.
The adhesive layer is formed by applying a pressure-sensitive adhesive composition and then curing. The pressure-sensitive adhesive composition preferably comprises 0.4 to 0.7 parts by weight of a silane-based coupling agent per 100 parts by weight of an acrylate base resin; 0.7 to 2.0 parts by weight of a polyfunctional crosslinking agent; And residual amounts of additives.
The acrylate base resin which is the first component of the pressure-sensitive adhesive composition is at least one selected from the group consisting of methyl methacrylate, urethane acrylate, epoxy acrylate, silicone acrylate, ethylhexyl acrylate, butyl acrylate, ethyl acrylate, isobornyl acrylate, Acrylates such as hexyl methacrylate, glycidyl methacrylate, glycidyl acrylate, behenyl acrylate, ethyl acrylate, lauryl acrylate, stearyl acrylate, acrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate , Hydroxyethyl methacrylate, phenoxy acrylate, methyl acrylate, hexanediol diacrylate, and mixtures thereof, and a resin composition having excellent tensile strength and elongation can be selected and removed High adsorption power of film Be a solvent-free ultraviolet curing resin so that a molecular weight of 50 to 300 are all people it is preferable to use the acrylic polymer resin composition.
In a preferred example, the acrylate base resin may be a partially cured or fully cured resin by photopolymerization, more preferably the acrylate base resin has a viscosity at 25 DEG C of from 2000 cps to 7000 cps, And preferably from 2500 cps to 4500 cps. If the viscosity is less than 2500 cps, the syrup may flow during the film coating, and when the viscosity exceeds 4500 cps, the coating performance may be poor.
The silane-based coupling agent, which is the second component of the pressure-sensitive adhesive composition, can improve the adsorptivity and adhesion of the film, thereby effectively removing the OCA residue. The silane-based coupling agent includes, for example,? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethyldiethoxysilane,? -Glycidoxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, Vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, Triethoxysilane, 3-isocyanatopropyltriethoxysilane, or gamma-acetoacetate propyltrimethoxysilane.
The addition amount of the silane coupling agent may be 0.01 to 3 parts by weight, preferably 0.4 to 0.7 parts by weight based on 100 parts by weight of the acrylate base resin. When the amount is less than 0.4 part by weight, the effect of improving the adsorptivity and adhesion can not be obtained. If the amount is more than 0.7 part by weight, adsorptivity and adhesiveness may be deteriorated.
As the third component of the pressure-sensitive adhesive composition, the polyfunctional crosslinking agent acts as an element for improving the tensile strength and elongation of the pressure-sensitive adhesive layer and enhances the degree of crosslinking between the compounds. According to the experiments conducted by the present inventors, it was confirmed that OCA elimination ability can not be exerted when a monofunctional crosslinking agent is used. The polyfunctional crosslinking agent may be selected from, for example, at least one of a polyene monomer, a polythiol monomer, a polyfunctional (meth) acrylate, and a mixture thereof. Specific examples thereof include triallyl isocyanurate, diaryl maleate, trimethylolpropane tris-thiopropionate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, diethylene glycol Dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylol propane diacrylate, trimethylol propane triacrylate, trimethylol propane dimethacrylate, trimethylol propane Butanediol diacrylate, 1,6-hexanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, pentaerythritol triacrylate , Pentaerythritol tetraacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, Triacrylate, urethane acrylate or urethane methacrylate, urea acrylate, and urea acrylate of tris (? -Hydroxyethyl) isocyanurate, dipentaerythritol hexaacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexaacrylate, You can choose more than one species.
The tensile strength and elongation of the film may be controlled by adjusting the amount of the polyfunctional crosslinking agent. The polyfunctional crosslinking agent is used in an amount of 0.005 to 10 parts by weight, preferably 0.7 to 2.0 parts by weight, based on 100 parts by weight of the acrylate based resin. do. If less than 0.7 part by weight is added, the effect of improving the tensile strength and elongation can not be obtained, and if it exceeds 2.0 parts by weight, the tensile strength and elongation may be lowered.
If necessary, the pressure-sensitive adhesive composition of the present invention may further contain at least one additive selected from a plasticizer, an ultraviolet absorber, a defoamer, an antioxidant, a colorant, a filler, a surfactant, and a mixture thereof.
The ultraviolet absorber serves to improve the photostability of the adhesive composition. And may include, for example, at least one selected from the group consisting of benzotriazole, benzophenone and triazine, but is not limited thereto. Preferably, a hydroxyphenylbenzotriazole-based ultraviolet absorber can be used. For example, the ultraviolet absorber may be selected from the group consisting of 7 to 9 linear or branched alkyl (meth) acrylates of 3- (2H-benzotriazol-2-yl) -5- (1,1-dimethylethyl) 4- Esters, 2- (benzotriazol-2-yl) -4- (2,4,4-trimethylpentan-2-yl) phenol, 2- (2'- 2- [2'-hydroxy-3 ', 5'-di-t-butyl (2'-hydroxybenzotriazole) Phenyl) benzotriazole, 2,4-hydroxybenzophenone, 2,4-hydroxy-4-methoxybenzophenone, 2,4-hydroxy-4-methoxybenzophenone- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- 1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-propoxyphenyl) 2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, and the like.
The ultraviolet absorber is preferably added in an amount of 0.001 to 1 part by weight per 100 parts by weight of the acrylate base resin. Within the above range, the yellowing of the surface of the film after curing can be prevented.
The antioxidant serves to prevent oxidation of the adhesive composition and to improve thermal stability. For example, at least one selected from the group consisting of a phenol compound, a quinone compound, an amine compound and a phosphite compound, but is not limited thereto. Examples of the antioxidant include pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), tris (2,4- ) Phosphite, and the like.
The antioxidant is preferably 0.001 to 1 part by weight based on 100 parts by weight of the acrylate base resin. Within the above range, the film after curing is prevented from being aged and exhibits excellent thermal stability.
The pressure-sensitive adhesive composition may have a viscosity at 25 DEG C of 2000 cps to 7000 cps, preferably 4000 cps to 4500 cps. By controlling the viscosity of the composition within the above range, process efficiency and physical properties after curing can be effectively maintained. When the viscosity of the composition is less than 4000 cps, the coating property is good, but it may not be easy to form a thick film. When the viscosity exceeds 4500 cps, the applicability of the pressure-sensitive adhesive is poor and it is difficult to form a uniform film.
The thickness of the adhesive layer is preferably 100 to 300 mu m, and more preferably 150 to 200 mu m. When the thickness is less than 100 mu m, the tensile strength and the elongation of the film are low, so that the adhesive film breaks or tears. When the thickness exceeds 300 mu m, the tensile strength is too strong, and the adherend, for example, the cover glass is likely to be broken.
In a preferred embodiment, the adhesive film for optical transparent adhesive (OCA) according to the present invention has a tensile strength of 0.6 to 2 MPa and an elongation of 800 to 1500%. Since the adhesive force of the adhesive film is excellent in such a range and the damage of the adherend can be minimized, the adhesive film of the present invention can be effectively used for an adherend which is difficult to handle, such as a cover glass of a closed touch screen.
Optical transparent adhesive ( OCA ) ≪ / RTI >
In one aspect of the present invention, there is provided a process for producing the above-mentioned pressure-sensitive adhesive film for optical transparent adhesive (OCA) removal, comprising the following steps.
S1 : a step of mixing an acrylate resin and a photopolymerization initiator which are free of ultraviolet rays and then photopolymerizing all or part of the mixture to obtain an acrylate base resin;
S2 : 0.7 to 2.0 parts by weight of a multifunctional crosslinking agent based on 100 parts by weight of the obtained acrylate base resin and the acrylate base resin; 0.4 to 0.7 parts by weight of a silane coupling agent; A photopolymerization initiator; And 0.01 to 1 part by weight of at least one additive selected from a plasticizer, an ultraviolet absorber, a defoaming agent, an antioxidant, a colorant, a filler, a surfactant, and a mixture thereof;
S3 : an adhesive film-forming step of applying the obtained pressure-sensitive adhesive composition onto a first substrate and ultraviolet curing the same;
S4 : optionally, attaching a release-treated second base material to the unattached surface of the first base material after the adhesive film-forming step;
The step ( S1 ) of obtaining the acrylate base resin is a step of mixing the acrylate resin and the photopolymerization initiator and then curing the whole or part of the resin by photo-curing.
The solvent-free ultraviolet curable acrylate resin is as described above for the adhesive composition, and preferably the solventless ultraviolet curable acrylate resin is 30 to 60 parts by weight of ethylhexyl acrylate (EHA), 30 to 60 parts by weight of isobornyl acrylate (IBOA) of 30 to 60 parts by weight, and 2-hydroxyethyl acrylate (HEA) of 5 to 30 parts by weight.
The photopolymerization initiator induces curing between the double bonds upon irradiation with ultraviolet light, thereby enhancing the strength and lowering the adhesive force. In addition, benzophenone, N, N'-tetramethyl-4,4'-diaminobenzo N, N'-tetraethyl-4,4'-diaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 2-benzyl- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethan-1-one, 1 -hydroxy-cyclohexyl- Aromatic ketones such as 4- (methylthio) phenyl) -2-morpholinopropanone-1,2,4-diethylthioxanthone, 2-ethyl anthraquinone and phenanthrenequinone, benzoin methyl ether, benzoin ethyl Benzoin ethers such as ether and benzoin phenyl ether, benzoin such as methyl benzoin and ethyl benzoin, benzyl derivatives such as benzyl dimethyl ketal, 2- (o-chlorophenyl) -4,5-diphenylimidazole Dimer, 2- (o-chlorophenyl) -4,5-di (m-methoxyphenyl) (O-fluorophenyl) -4,5-phenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-diphenylimidazole dimer, 2- (p-methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) -5-phenylimidazole dimer and 2- (2,4- 2,4,5-triarylimidazole dimer, 9-phenylacridine and 1,7-bis (9,9'-arcs) such as diphenylimidazole dimer, (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, and a mixture thereof.
The amount of the photopolymerization initiator is not particularly limited, but is preferably 0.01 to 1 part by weight based on 100 parts by weight of the acrylate base resin.
The step ( S2 ) of obtaining the pressure-sensitive adhesive composition comprises: 0.7 to 2.0 parts by weight of a multifunctional crosslinking agent based on 100 parts by weight of the acrylate base resin obtained in the previous step S1 and the acrylate base resin; 0.4 to 0.7 parts by weight of a silane coupling agent; A photopolymerization initiator; And 0.01 to 1 part by weight of at least one additive selected from the group consisting of a plasticizer, an ultraviolet absorber, a defoaming agent, an antioxidant, a colorant, a filler, a surfactant, and a mixture thereof and then photocuring the mixture to obtain a pressure-sensitive adhesive composition. As described above, the pressure-sensitive adhesive composition has a viscosity at 25 DEG C of 2000 cps to 7000 cps, preferably 4000 cps to 4500 cps.
In the adhesive film forming step ( S3 ), the adhesive composition obtained in the step ( S2 ) is coated on the first substrate and ultraviolet cured to form a film.
The coating method can be generally carried out using a bar coater. In mass production, a comma coating is preferable. After coating, it is preferable to completely cure the film using an ultraviolet curing machine.
The second substrate attaching step ( S4 ) is an optional step. After the adhesive film forming step ( S3 ), the second substrate subjected to the release treatment is attached to the surface not attached to the first substrate to prevent the adhesive film from being damaged .
Waste of the touch screen OCA How to uninstall
Another aspect of the present invention is a method for removing OCA of a closed touch screen using an adhesive film for removing the optical transparent adhesive (OCA).
In order to effectively remove the remaining OCA on the cover glass surface during the closed touch screen reproduction process, an adhesive film for removing optical transparent adhesive (OCA) was attached to face the OCA, laminated at a pressure of 1 to 5 kgf / cm, After leaving, the OCA can be easily removed by pulling the adhesive film for optical transparent adhesive (OCA) removal. The details of the method for regenerating the above-mentioned closed touch screen are disclosed in the above-mentioned Japanese Patent No. 10-1404480, the contents of which are incorporated herein by reference.
According to the method of the present invention, it is not necessary to use any other chemical method or device, and it is possible to cleanly remove OCA from the adhesive film of the present invention only by a simple process after detaching and attaching the adhesive film, Which is very effective in activating the recycling of the waste touch screen.
Hereinafter, the present invention will be described in more detail with reference to Examples. It will be apparent to those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not limited to these embodiments.
[ Manufacturing example 1] portion 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 mixed in a reactor capable of nitrogen gas refluxing and photopolymerization, 0.5 part by weight of 1-hydroxy-cyclohexyl phenyl ketone (IGACURE 184, manufactured by BASF) as a photopolymerization initiator was added and photopolymerized for 30 minutes, oxygen was injected into the reactor to inactivate the initiator to terminate the reaction. At this time, a base resin having a viscosity of 2500 cps was obtained. At this time, the molecular weight is 1 million.
[ Example One]
0.5 part by weight of a multifunctional crosslinking agent, 1,4-butanediol dimethacrylate, 0.3 part by weight of a silane coupling agent, 3 parts by weight of isocyanate propyltriethoxysilane, 0.3 parts by weight of a photoinitiator (manufactured by BASF, Igakure 651) And 0.5 part by weight of the resin were mixed to prepare a resin composition after UV polymerization, and a resin coating liquid having a viscosity of 3500 to 4000 cps was prepared. The prepared coating solution was coated on a 75 占 퐉 thick polyethylene terephthalate (PET) film having a thickness of 150 占 퐉 as a resin coating liquid, and irradiated for 3 minutes using a UV curing machine to cure the coating solution. Then, 38 占 퐉 thick polyethylene terephthalate , Toray) film to prepare an OCA removing film.
[ Example 2]
1 part by weight of a multifunctional crosslinking agent, 1,4-butanediol dimethacrylate, 0.5 part by weight of a silane coupling agent, 3-isocyanate propyltriethoxysilane, a photoinitiator (IGACURE 651, manufactured by BASF) And 0.5 part by weight of the resin were mixed to prepare a resin composition after UV polymerization, and a resin coating liquid having a viscosity of 4000 to 4500 cps was prepared. The prepared coating solution was coated on a 75 占 퐉 thick polyethylene terephthalate (PET) film having a thickness of 150 占 퐉 as a resin coating liquid, and irradiated for 3 minutes using a UV curing machine to cure the coating solution. Then, 38 占 퐉 thick polyethylene terephthalate , Toray) film to prepare an OCA removing film.
[ Example 3]
3 parts by weight of a multifunctional crosslinking agent, 1,4-butanediol dimethacrylate, 1 part by weight of a silane coupling agent, 3 parts by weight of isocyanate propyltriethoxysilane, 1 part by weight of a photoinitiator (manufactured by BASF, Igakure 651) And 0.5 part by weight of the resin were mixed to prepare a resin composition after UV polymerization, and a resin coating solution having a viscosity of 4500 to 5000 cps was prepared. The prepared coating solution was coated on a 75 占 퐉 thick polyethylene terephthalate (PET) film having a thickness of 150 占 퐉 as a resin coating liquid, and irradiated for 3 minutes using a UV curing machine to cure the coating solution. Then, 38 占 퐉 thick polyethylene terephthalate , Toray) film to prepare an OCA removing film.
[ Comparative Example One]
1 part by weight of a monofunctional crosslinking agent alkyl methacrylate and 0.5 part by weight of a photo initiator (manufactured by BASF, IGACURE 651) were mixed with 100 parts by weight of the base resin to prepare a resin composition after UV polymerization and a viscosity of 2500 cps to 3000 cps To prepare a coating solution. The prepared coating solution was coated on a 75 占 퐉 thick polyethylene terephthalate (PET) film having a thickness of 150 占 퐉 as a resin coating liquid, and irradiated for 3 minutes using a UV curing machine to cure the coating solution. Then, 38 占 퐉 thick polyethylene terephthalate , Toray) film to prepare an OCA removing film.
[Comparative Example 2]
An OCA film (3M 8146-150) of 150 m thickness of 3M was purchased.
[ Experimental Example One] The tensile strength And Elongation Measure
The results are shown in Table 2 below. [Table 2] < tb > < tb > < tb >
As a result of the experiment, it was possible to control the strength and peel strength of the film by using the crosslinking agent and the coupling agent, and the high tensile strength was not seen in the conventional OCA film. In case of Example 3, when the amount of the polyfunctional crosslinking agent exceeded a certain amount, the tensile strength of the film was weak. In Comparative Example 1, when the monofunctional crosslinking agent was used, the tensile strength was lower than that of the polyfunctional crosslinking agent, In case of Comparative Example 2, a commercially available OCA film is generally used and the tensile strength is low so that it can not be used as an OCA removing film.
[ Experimental Example 2] Peel force
The OCA removal film was adhered to the 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 was measured at 25 占 폚.
As a result of the experiment, it was found that the higher the elongation, the higher the peeling force, and in Comparative Example 1 using the monofunctional crosslinking agent, the elongation was lower than the tensile strength.
[Experimental Example 3] OCA removal test
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, and then the OCA removal film was pulled to remove the OCA and then the removal force was measured.
From the results shown in the above Table 3, it can be seen that the film having a high tensile strength and elongation rate has a good removability by increasing the degree of crosslinking using a polyfunctional crosslinking agent, and when the tensile strength is low as in Comparative Example 1, It can be seen that it can not have OCA removal ability because it is broken or torn.
The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.
Claims (14)
0.4 to 0.7 parts by weight of 3-isocyanate-propyltriethoxysilane as a silane-based coupling agent based on 100 parts by weight of an acrylate base resin; 0.7 to 2.0 parts by weight of 1,4-butanediol dimethacrylate as a polyfunctional crosslinking agent; And 0.01 to 1 part by weight of a photopolymerization initiator;
Wherein the pressure-sensitive adhesive composition has a viscosity at 25 DEG C of from 4000 cps to 4500 cps.
Wherein the acrylate base resin has a viscosity at 25 DEG C of from 2500 cps to 4500 cps.
And the peel strength is 3320 gf / in. The adhesive film for removing optical transparent adhesive (OCA)
Wherein the object to be adhered is a closed touch screen.
A solvent-free ultraviolet curable acrylate resin and a photopolymerization initiator, followed by photopolymerization in whole or in part to obtain an acrylate based resin;
0.7 to 2.0 parts by weight of 1,4-butanediol dimethacrylate as a multifunctional crosslinking agent based on 100 parts by weight of the obtained acrylate base resin and the acrylate base resin; 0.4 to 0.7 parts by weight of 3-isocyanate propyltriethoxysilane as a silane coupling agent; 0.01 to 1 part by weight of a photopolymerization initiator; And 0.001 to 1 part by weight of at least one additive selected from the group consisting of a plasticizer, an ultraviolet absorber, an antifoaming agent, an antioxidant, a colorant, a filler, a surfactant, and mixtures thereof, followed by photopolymerization to obtain a pressure sensitive adhesive composition;
An adhesive film forming step of applying the obtained pressure sensitive adhesive composition onto a first substrate and ultraviolet curing the adhesive film; Lt; / RTI >
Wherein the pressure-sensitive adhesive composition has a viscosity at 25 DEG C of from 4000 cps to 4500 cps.
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| CN106947402A (en) * | 2016-01-06 | 2017-07-14 | 株式会社吉泰 | Optically clear adhesive removal adhesive film and preparation method thereof and the optically clear adhesive minimizing technology using its touch-screen |
| KR101785380B1 (en) * | 2016-04-12 | 2017-10-16 | 주식회사 테이팩스 | Adhesive Film |
| CN107639916A (en) * | 2017-09-14 | 2018-01-30 | 深圳晶华显示器材有限公司 | The rework method of defective products after touch-screen is bonded entirely |
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| CN109423239A (en) * | 2017-08-29 | 2019-03-05 | 黑牛食品股份有限公司 | Optical transparent adhesive, touch-control module and touch control display apparatus |
| CN107639916A (en) * | 2017-09-14 | 2018-01-30 | 深圳晶华显示器材有限公司 | The rework method of defective products after touch-screen is bonded entirely |
| KR20210028771A (en) | 2019-09-04 | 2021-03-15 | 이승현 | Adhesive sheet of label by differentiating discontinuously cohesiveness of layer |
| CN115386306A (en) * | 2022-08-15 | 2022-11-25 | 江苏皇冠新材料科技有限公司 | Optical cement, preparation method thereof and related product |
| CN117363241A (en) * | 2023-09-28 | 2024-01-09 | 昆山博益鑫成高分子材料有限公司 | UV (ultraviolet) adhesive-reducing tape and preparation method thereof |
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