KR20150069157A - Ito heat-protecting film for processing touch screen panel and manufacturing method thereof - Google Patents
Ito heat-protecting film for processing touch screen panel and manufacturing method thereof Download PDFInfo
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- KR20150069157A KR20150069157A KR1020130155244A KR20130155244A KR20150069157A KR 20150069157 A KR20150069157 A KR 20150069157A KR 1020130155244 A KR1020130155244 A KR 1020130155244A KR 20130155244 A KR20130155244 A KR 20130155244A KR 20150069157 A KR20150069157 A KR 20150069157A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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Abstract
The present invention relates to an ITO heat-resistant protective film for a touch screen panel process and a method of manufacturing the same.
In the ITO heat-resistant protective film of the present invention, in the structure in which the adhesive layer is formed on the transparent base layer and the release layer is laminated on the adhesive layer, the adhesive layer is composed of two types of soft acrylic monomers having different glass transition temperatures (Tg) A pressure-sensitive adhesive composition comprising an acrylic polymer resin polymerized with a hard monomer and having no adhesive residue under a high-temperature process, facilitating control of adhesion, and containing a curing agent and a plasticizer to the acrylic polymer resin to improve heat resistance and flexibility By optimizing the thickness and drying conditions during coating, it is possible to suppress the increase in adhesive force generated after heat treatment in the touch screen panel process, to prevent the occurrence of curling of ITO film and to suppress the pressing of ITO film Dent phenomenon can be solved to improve the productivity of the touch screen panel process and reduce the defect rate of the touch screen panel have.
Description
The present invention relates to an ITO heat-resistant protective film for a touch screen panel process and a method of manufacturing the same, and more particularly, to an ITO heat-resistant protective film for a touch screen panel process in which, in a structure in which an adhesive layer is formed on a transparent substrate layer and a release layer is laminated on the adhesive layer, Two types of soft acrylic monomers having different glass transition temperatures (Tg) and an acrylic polymer resin polymerized with a hard monomer are used so that there is no adhesive residue in a high temperature process and the adhesion force is easily controlled, And the pressure-sensitive adhesive composition of the present invention is formed of a pressure-sensitive adhesive composition containing a plasticizer and improved heat resistance and flexibility. The coating thickness and the drying conditions of the pressure-sensitive adhesive composition are optimized, whereby no curling of the ITO film occurs after the heat treatment, The present invention relates to an ITO heat-resistant protective film for a touch screen panel process and a method of manufacturing the same.
A touch screen panel (TSP) is an input device of an automatic system which allows a user to easily input data by simply touching the screen (screen) with a hand or an object. The touch screen panel (TSP) Resistive, Capacitive, Infrared, and Acoustic are distinguished.
Resistive type and capacitive type are the most widely used methods at present. Resistive type method detects the potential difference when touching with a finger or pen when a potential difference occurs at a pressed point. It is a working principle and it is also called a decompression type.
In addition, the electrostatic capacity type has a merit of fast response speed and durability because it senses a part where the direction of current is changed by using the electrostatic capacity in the human body.
At this time, ITO (Indium-Tin Oxide, ITO) film is commonly used in the structure of a resistive film and capacitive touch screen panel.
The ITO film is formed by sputtering a transparent conductive film made of indium tin compound, which is a metal conductive material, or depositing the transparent conductive film by a physical or chemical method to form a transparent electrode (electric circuit) pattern on the base substrate.
In the manufacturing process of the touch screen panel, the roll-shaped ITO film is cut according to the standard, the heat treatment step is performed at 150 ° C. for about 90 minutes in order to crystallize the cut ITO film, The upper plate and the lower plate are completed by an etching (patterning) forming step and an electrode printing step, and the completed upper and lower plates are laminated with an OCA film, and the air bubbles are removed from the OCA film by an autoclave .
In addition, in the manufacturing process of the touch screen panel (TSP) using the ITO film, a protective film is joined to the back surface of the ITO.
At this time, the ITO crystallization during the touch screen panel process and the heat treatment process for the dimensional stability of the ITO film proceeds. When the protective film laminated with the ITO film is used as the general protective film, the protective film peeling The workability of the ITO film is lowered, and after the transfer of the pressure-sensitive adhesive onto the ITO film, the transfer of the pressure-sensitive adhesive and the curl of the ITO film are accompanied by the dent phenomenon of the ITO film caused by the protective film .
In particular, with the recent increase in demand for touch screen panels, there is an increasing demand for ITO films and protective films thereon, and the appearance of ITO films is becoming more important as the touch screen panel is being developed in a high image quality and large area.
However, in the past, improvements have been made to the problem of curl due to heat shrinkage of the ITO film and the protective film, but efforts to improve the dent problem of the ITO film by the protective film after the high temperature heat treatment are insufficient It is a situation.
According to Korean Patent No. 2011-78682 for a protective film used in the touch screen field, a coating layer using a polyurethane binder having a glass transition temperature of -4 to 10 占 폚 or an acrylic binder resin having a glass transition temperature of -10 to 20 占There is a report on improvement of physical properties such as improvement of total light transmittance or improvement of adhesion. However, research on improvement of physical properties accompanying high temperature process in touch screen panel process is insufficient.
As a result, the present inventors have found that there is no residue of a pressure-sensitive adhesive under the high-temperature heat treatment process at 130 to 160 ° C during the touch screen panel process, the adhesion is easily controlled, the ITO film after the heat treatment is not curled, In order to realize improved physical properties of the ITO film after dipping, two kinds of soft acrylic monomers and hard monomers having different glass transition temperatures (Tg) are mixed and polymerized using an acrylic polymer resin, There is provided an ITO heat-resistant protective film comprising a pressure-sensitive adhesive layer provided with heat resistance and flexibility by optimizing a pressure-sensitive adhesive composition containing no pressure-sensitive adhesive residue under the pressure-sensitive adhesive layer and easily controlling the adhesive force and containing a curing agent and a plasticizer in the acrylic polymer resin, .
An object of the present invention is to provide an ITO heat-resistant protective film in which the rise of the adhesive layer after heat treatment in a high-temperature process of a touch screen panel process is suppressed, curling of the ITO film is small, and dent phenomenon of the ITO film is minimized.
It is still another object of the present invention to provide a method for manufacturing an ITO heat-resistant protective film which is performed under optimal conditions for each process that can satisfy physical properties of a protective film after heat treatment for a touch screen panel process.
In order to achieve the above object, the present invention relates to a transparent substrate layer (1), which comprises a transparent acrylic resin, a soft monomer having a glass transition temperature of 0 ° C or lower, a hard monomer having a glass transition temperature of 0 ° C or higher and an acrylic polymer resin Wherein the pressure-sensitive adhesive layer (2) coated with an adhesive composition comprising 0.2 to 10 parts by weight of a curing agent and 1 to 3 parts by weight of a plasticizer is formed on the pressure-sensitive adhesive layer, and a release layer (3) ITO heat-resistant protective film.
In the ITO heat-resistant protective film of the present invention, the acrylic polymer resin constituting the pressure-sensitive adhesive layer (2) contains 70 to 98% by weight of a single or two or more kinds of mixed forms selected from soft acrylic monomers having a glass transition temperature of 0 캜 or lower, A polymeric resin having a weight average molecular weight of 300,000 to 2,000,000, which is obtained by polymerizing 1 to 20% by weight of a mixture of two or more types of the monomer selected from the group consisting of hard monomers having a transition temperature of 0 ° C or higher and 1 to 10% by weight of an acrylic crosslinking monomer.
Here, the hard monomer is selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene, and acrylonitrile, and the acrylic monomer alone or in a mixed form thereof is used.
The above-mentioned acrylic polymer resin has a glass transition temperature of -50 to -20 캜, and satisfies the physical properties of a film having an adhesive force of 5 to 100 gf / 25 mm.
In the ITO heat-resistant protective film of the present invention, the thickness of the adhesive layer (2) is preferably 2 to 30 mu m.
The present invention also relates to a resin composition comprising: 1) 0.2 to 10 parts by weight of a curing agent based on 100 parts by weight of a soft acrylic monomer having a glass transition temperature of 0 ° C or lower, a hard monomer having a glass transition temperature of 0 ° C or higher and an acrylic- 1 to 3 parts by weight of a pressure-sensitive adhesive composition,
2) applying the pressure-sensitive adhesive composition on the base layer and performing the drying at a temperature of 120 to 170 캜 for 1 to 3 minutes for drying to form an adhesive layer,
3) a process for producing an ITO heat-resistant protective film comprising a pressure-sensitive adhesive layer and a release layer laminated on the pressure-sensitive adhesive layer.
The acrylic polymer resin in the above step 1) of the present invention may be used alone or in combination of two or more kinds selected from the group consisting of 70 to 98% by weight of a soft acrylic monomer having a glass transition temperature of 0 ° C or lower, a hard monomer having a glass transition temperature of 0 ° C or higher And 1 to 20% by weight of a mixture of two or more types selected from the group consisting of acrylic cross-linked monomers and 1 to 10% by weight of acrylic cross-linked monomers, and has a weight average molecular weight of 300,000 to 2,000,000.
In the step 2) of the production method of the present invention, the thickness of the adhesive layer is preferably 2 to 30 占 퐉 to optimize the physical properties.
According to the present invention, by optimizing the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer in the structure in which the pressure-sensitive adhesive layer is formed on the transparent base layer and the release layer is laminated on the pressure-sensitive adhesive layer, Can be suppressed, the occurrence of curling of the ITO film is reduced, and in particular, the dent phenomenon of the ITO film is minimized.
By providing a method of manufacturing the optimum condition of the ITO heat-resistant protective film of the present invention, it is possible to improve the productivity of the touch screen panel process and reduce the defect rate of the touch screen panel.
1 is a schematic cross-sectional view of an ITO heat-resistant protective film for a touch screen panel process of the present invention.
Hereinafter, the present invention will be described in detail.
1 is a schematic sectional view of an ITO heat-resistant protective film for a touch screen panel process according to the present invention, in which an
More particularly, the present invention relates to a
Based on 100 parts by weight of a soft acrylic monomer having a glass transition temperature of 0 ° C or lower, a hard monomer having a glass transition temperature of 0 ° C or higher and an acrylic crosslinked monomer polymerized, 0.2 to 10 parts by weight of a curing agent and 1 to 3 parts by weight of a plasticizer The adhesive layer (2) and the adhesive layer
And a release layer (3) is laminated on the pressure-sensitive adhesive layer to provide an ITO heat-resistant protective film for a touch screen panel process.
In the ITO heat-resistant protective film of the present invention, the acrylic polymer resin constituting the pressure-sensitive adhesive composition preferably comprises 70 to 98% by weight of a mixture of two or more acrylic resins selected from soft acrylic monomers having a glass transition temperature of 0 ° C or lower, Lt; 0 > C or more and 1 to 20% by weight of a mixture of two or more thereof and 1 to 10% by weight of an acrylic crosslinking monomer.
At this time, the soft acrylic monomer may be any known acrylic monomer that imparts flexibility and adhesion to the acrylic polymer resin and satisfies the above-mentioned glass transition temperature requirement.
Thus, it is preferable to use at least one monomer selected from the group consisting of butyl (meth) acrylate, hexyl acrylate, hexyl methacrylate, n-propyl (meth) acrylate, n-tetradecyl (meth) Ethylhexyl acrylate, and mixtures of two or more thereof.
In the examples of the present invention, butyl (meth) acrylate, 2-hydroxyethyl acrylate, and 2-ethylhexyl acrylate are mixed as soft acrylic monomers, but the present invention is not limited thereto.
The soft acrylic monomer is preferably contained in the adhesive composition in an amount of 70 to 98% by weight, and the content of the soft acrylic monomer can be controlled according to the content of the hard monomer.
The acrylic polymer resin of the present invention contains a hard monomer having a glass transition temperature of 0 ° C or higher, thereby giving a cohesive force to the pressure-sensitive adhesive composition of the present invention.
As a preferable example of the hard monomer having a glass transition temperature of 0 ° C or higher, an acrylic monomer, a methyl methacrylate, an ethyl methacrylate, a vinyl acetate, a styrene and an acrylonitrile, And the like.
In the examples of the present invention, methyl acrylate alone is used as the hard monomer, but the present invention is not limited thereto.
The hard monomer of the present invention preferably contains 1 to 20% by weight in the pressure-sensitive adhesive composition. When the content is less than 1% by weight, the content of the hard monomer is small and the glass transition temperature of the protective film is too low, The component is transcribed. On the other hand, if the content of the hard monomer exceeds 20% by weight, the glass transition temperature of the protective film becomes excessively high, and the adhesion with the ITO film decreases.
The crosslinking monomer, which is another composition of the acrylic polymer resin, is used for copolymerizing the soft acrylic monomer and the hard monomer.
As a preferable example thereof, any one or more selected from the group consisting of a monomer containing a hydroxy group, a monomer containing a carboxyl group and a monomer containing nitrogen may be used, and acrylic crosslinking monomers are more preferably used.
Examples of the monomer containing a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl Acrylate, 2-hydroxyethylene glycol (meth) acrylate or 2-hydroxypropylene glycol (meth) acrylate. Examples of the monomer containing a carboxyl group include (meth) acrylic acid, maleic acid or fumaric acid, The nitrogen-containing monomer may be acrylamide, N-vinylpyrrolidone or N-vinylcaprolactam. The above crosslinking monomers may be used alone or in combination of two or more.
The glass transition temperature of the acrylic polymer resin copolymerized from the above composition is -50 캜 to -20 캜, preferably -45 캜 to -30 캜. If the glass transition temperature of the acrylic polymer resin is less than -50 캜, the glass transition temperature of the polymer itself is low even when the pressure-sensitive adhesive composition is cured and has a three-dimensional network structure, so that deformation occurs at the time of high temperature evaluation.
On the other hand, if the glass transition temperature of the acrylic polymer resin is higher than -20 ° C, the cured adhesive composition has a three-dimensional network structure more densely than the composition having a low glass transition temperature.
The weight average molecular weight of the acrylic polymer resin used in the present invention is preferably 300,000 to 2,000,000. If the weight average molecular weight is less than 300,000, the adhesive residual phenomenon occurs due to a decrease in cohesive strength. If the weight average molecular weight is more than 2,000,000, And the elasticity and adhesion of the pressure-sensitive adhesive increase.
The
As described above, the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer (2) of the ITO heat-resistant protective film for the touch screen panel process of the present invention comprises two kinds of soft acrylic monomers and hard monomers having different glass transition temperatures (Tg) By using the acrylic polymer resin which is polymerized by mixing, there is no adhesive residue under a high temperature process, and the adhesive force is easily controlled.
The pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer (2) of the ITO heat-resistant protective film for the touch screen panel process of the present invention may contain 0.2 to 10 parts by weight of a curing agent per 100 parts by weight of the acrylic polymer resin to improve heat resistance. In embodiments of the present invention, aziridine curing agents may be used, but not limited thereto. If the amount of the curing agent is less than 0.2 parts by weight, crosslinking may not be sufficiently carried out and the surface may be transferred. If the amount is more than 10 parts by weight, excessive curing agent may enter the side reaction.
Further, the pressure-sensitive adhesive composition of the present invention contains 1 to 3 parts by weight of a plasticizer per 100 parts by weight of the acrylic polymer resin, thereby improving flexibility. Any conventional plasticizer component can be used. If the content of the plasticizer is less than 1 part by weight, the flexibility of the pressure-sensitive adhesive is deteriorated and it is not preferable due to the occurrence of dents of the ITO film. When the content of the plasticizer exceeds 3 parts by weight, adhesion and substrate adhesion are difficult to be deteriorated.
The wettability of the above-mentioned pressure-sensitive adhesive composition to the adherend depends on the cohesive strength of the pressure-sensitive adhesive composition or the thickness of the adhesive layer formed by the pressure-sensitive adhesive composition.
At this time, if the cohesive force of the adhesive layer is increased, the wettability to the surface of the substrate is lowered. Such wettability to the adherend achieves properties required for managing the glass transition temperature of the acrylic polymer resin and the thickness of the adhesive layer .
Therefore, in order to set the glass transition temperature (Tg) of the acrylic polymer resin to -50 ° C or higher, the type and polymerization ratio of each monomer should be appropriately selected.
First, the tackiness (degree of stickiness of the pressure-sensitive adhesive) of the pressure-sensitive adhesive composition of the present invention is determined depending on the combination of the soft monomer and the hard monomer among the monomer components constituting the pressure-sensitive adhesive layer. At this time, when the content of the soft monomer is increased, the glass transition temperature of the adhesive layer is lowered and the tack characteristics are increased. When the content of the hard monomer is increased, the glass transition temperature of the adhesive layer is increased and the tack characteristics are lowered.
In addition, the thickness of the
In the ITO heat-resistant protective film of the present invention, the base layer (1) may be a polyester polymer such as polyethylene terephthalate or polyethylene naphthalate, an acrylic polymer such as polymethyl methacrylate, a polystyrene or an acrylonitrile-styrene copolymer AS resin), a polycarbonate-based polymer, and the like can be used.
Examples of the polymer include polyolefin polymers such as polyethylene, polypropylene, cycloaliphatic or norbornene structure, polyolefin polymers such as ethylene-propylene copolymer, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, Based polymer, a polyether-etherketone-based polymer, a polyphenylene sulfide-based polymer, a vinyl alcohol-based polymer, a vinylidene chloride-based polymer, a vinyl butyral-based polymer, an allylate-based polymer, a polyoxymethylene-based polymer , An epoxy-based polymer, a blend polymer of the polymer, an acrylic-based, urethane-based, acrylic urethane-based, epoxy-based or silicone-based thermosetting or ultraviolet curable resin.
In the embodiment of the present invention, a polyethylene terephthalate (PET) film is used as the
As described above, the adhesion strength of the ITO heat-resistant protective film for the touch screen panel process of the present invention is preferably 5 to 100 g / 25 mm. If the adhesive strength is less than 5 g / 25 mm, peeling may occur during the process, The surface of the ITO film may be damaged during peeling.
The ITO heat-resistant protective film for the touch screen panel process according to the present invention has no curling of the ITO film after heat treatment, and in particular, no dent phenomenon of the ITO film is observed after the heat treatment.
The present invention also relates to a resin composition comprising: 1) 0.2 to 10 parts by weight of a curing agent based on 100 parts by weight of a soft acrylic monomer having a glass transition temperature of 0 ° C or lower, a hard monomer having a glass transition temperature of 0 ° C or higher and an acrylic- And 1 to 3 parts by weight of a plasticizer are mixed,
2) applying the pressure-sensitive adhesive composition on the base layer and performing the drying at a temperature of 120 to 170 캜 for 1 to 3 minutes for drying to form an adhesive layer,
3) a process for producing an ITO heat-resistant protective film comprising a pressure-sensitive adhesive layer and a release layer laminated on the pressure-sensitive adhesive layer.
The pressure-sensitive adhesive composition of the present invention is the same as that described above. The pressure-sensitive adhesive composition of the present invention is characterized in that two kinds of soft acrylic monomers and hard monomers having different glass transition temperatures (Tg) By polymerizing the polymerized acrylic polymer resin, there is no residue of the pressure-sensitive adhesive under a high-temperature heat treatment process at 130 to 160 ° C, and the adhesive strength is easily controlled.
In addition, there is no curling of the ITO film after the heat treatment, and in particular, the ITO film after the heat treatment is not observed. Therefore, the ITO film is suitable for the touch screen panel process.
Thus, the production method according to the present invention optimizes the components and the content of the pressure-sensitive adhesive composition and can control the physical properties according to the coating thickness, the drying temperature and the drying time during the formation of the adhesive layer.
Thus, the acrylic polymer resin contained as a main component in the pressure-sensitive adhesive composition is selected from a soft monomer having a glass transition temperature of 0 ° C or lower, a solid monomer having a glass transition temperature of 0 ° C or higher, Polymeric resin having a weight average molecular weight of 300,000 to 2,000,000, which is obtained by polymerizing 1 to 20% by weight of a mixed type of two or more types of resins and 1 to 10% by weight of an acrylic type crosslinked monomer.
The pressure-sensitive adhesive composition of the present invention contains 0.2 to 10 parts by weight of a curing agent and 1 to 3 parts by weight of a plasticizer in an acrylic polymer resin, thereby suppressing an increase in adhesive strength and eliminating adhesive transfer, No dent phenomenon of the ITO film is observed after the heat treatment.
Further, when the pressure-sensitive adhesive composition is applied in step 2) of the production method of the present invention, the thickness of the pressure-sensitive adhesive layer is applied in the range of 2 to 30 占 퐉 to realize the optimum properties. If the thickness is less than 2 탆, the adhesiveness with the ITO film is poor. If the thickness is more than 30 탆, the workability is lowered due to the increase of the adhesive strength, and the adhesive may be transferred after the heat treatment.
After the application of the pressure-sensitive adhesive composition in the step 2), the physical properties of the pressure-sensitive adhesive composition vary depending on the drying conditions, so that a preferable drying temperature is 120 to 170 ° C and a drying time is 1 to 3 minutes.
At this time, if the drying temperature is higher than 120 ° C and the temperature is higher than 170 ° C, the adhesive property is satisfied, but after the heat treatment, curling occurs after the ITO film and the laminate due to heat shrinkage as a characteristic of the PET film.
Also, when the drying time is out of the range of 1 to 3 minutes, a curl occurs after the lapping with the ITO film, and a dent phenomenon of the ITO film is observed after the heat treatment.
Hereinafter, the present invention will be described in more detail with reference to Examples.
The present invention is intended to more specifically illustrate the present invention, and the scope of the present invention is not limited by these examples.
< Manufacturing example 1 to 4> Resin Production of Acrylic Copolymer
The components listed in the following Table 1 were introduced in order into a 1,000 ml chemical reactor equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen introducing apparatus, 100 g of ethyl acetate as a solvent was added, and azobisdimethylvaleronitrile (ADMVN ) Was added, and the mixture was polymerized at 50 DEG C for 15 hours in a nitrogen stream to prepare a polymer resin composed of an acrylic copolymer.
< Example 1>
4.0 g of the aziridine-based curing agent and 2.0 g of the plasticizer were uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 1 of Table 1, and then the PSA was coated on the PET substrate with a thickness of 10 m and dried at 130 DEG C for 2 minutes To prepare a protective film.
< Example 2>
4.0 g of the aziridine curing agent and 2.0 g of the plasticizer were uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1 and then coated on the PET substrate with a PSA thickness of 10 탆 and dried at 130 캜 for 2 minutes To prepare a protective film.
< Comparative Example 1>
4.0 g of the aziridine curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 1 of Table 1, and then the PSA was coated on the PET substrate with a thickness of 10 탆 and dried at 130 캜 for 2 minutes to form a protective film Respectively.
< Comparative Example 2>
4.0 g of the aziridine-based curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1, and then coated on the PET substrate with a thickness of 10 탆 of PSA and dried at 130 캜 for 2 minutes to form a protective film Respectively.
< Comparative Example 3>
100 g of the acrylic polymer resin polymerized in Production Example 1 of Table 1 was uniformly mixed with 1.0 g of an aziridine curing agent and then coated on a PET substrate with a PSA thickness of 10 占 퐉 and dried at 130 占 폚 for 2 minutes to give a protective film Respectively.
< Comparative Example 4>
11 g of the aziridine-based curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 1 of Table 1, and then coated with a PSA thickness of 10 탆 on the PET substrate and dried at 130 캜 for 2 minutes to prepare a protective film Respectively.
< Comparative Example 5>
4.0 g of the aziridine curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1, and then coated with a PSA thickness of 1 탆 on the PET substrate and dried at 130 캜 for 2 minutes to form a protective film Respectively.
< Comparative Example 6>
4.0 g of the aziridine-based curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1, coated on the PET substrate with a PSA thickness of 35 탆 and dried at 130 캜 for 2 minutes to obtain a protective film Respectively.
< Comparative Example 7>
4.0 g of the aziridine curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1, and then coated on the PET substrate with a PSA thickness of 10 탆 and dried at 110 캜 for 2 minutes to obtain a protective film Respectively.
< Comparative Example 8>
4.0 g of the aziridine-based curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1, and then the PSA was coated on the PET substrate with a thickness of 10 탆 and dried at 180 캜 for 2 minutes to form a protective film Respectively.
< Comparative Example 9>
100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1 was uniformly mixed with 4.0 g of an aziridine curing agent and then coated on a PET substrate with a PSA thickness of 10 占 퐉 and dried at 130 占 폚 for 50 seconds to give a protective film Respectively.
< Comparative Example 10>
4.0 g of the aziridine-based curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 2 of Table 1, and then the PSA was coated on the PET substrate with a thickness of 10 탆 and dried at 130 캜 for 4 minutes to form a protective film Respectively.
< Comparative Example 11>
4.0 g of the aziridine curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 3 of Table 1, and then the PSA was coated on the PET substrate with a thickness of 10 탆 and dried at 130 캜 for 2 minutes to form a protective film Respectively.
< Comparative Example 12>
4.0 g of the aziridine curing agent was uniformly mixed with 100 g of the acrylic polymer resin polymerized in Production Example 4 of Table 1, and then coated on the PET substrate with a PSA thickness of 10 占 퐉 and dried at 130 占 폚 for 2 minutes to give a protective film Respectively.
< Experimental Example > Property evaluation of protective film
1. Adhesion measurement after heat treatment
The protective films prepared in Examples 1 to 2 and Comparative Examples 1 to 12 were laminated to a general PET film and heat-treated at 150 ° C for 1 hour to measure adhesive strength.
At this time, if the adhesive force measurement value exceeds 100 gf, it is removed by hand, so when the adhesive strength is high, the worker easily becomes fatigued and the production ability is lowered.
2. Confirm PSA Residue
The protective films prepared in Examples 1 to 2 and Comparative Examples 1 to 12 were laminated to a general PET film, and then the adhesive transfer after heat treatment at 150 DEG C for 1 hour was visually checked.
At this time, if no residual component was found during the pressure-sensitive adhesive transfer,?: Good, if confirmed, x: bad.
3. Curl measurement
The protective films prepared in Examples 1 and 2 and Comparative Examples 1 to 12 were laminated to a general PET film and then the height of curl after heat treatment at 150 ° C for 1 hour was measured.
At this time, if the curl height is 10 mm or less, it is determined that: ●: good, and if it exceeds 10 mm, ×: poor.
4. Confirmation of ITO film dent
The protective films prepared in Examples 1 and 2 and Comparative Examples 1 to 12 were laminated to a general PET film, and it was confirmed whether or not dents of the ITO films after heat treatment at 150 ° C for 1 hour were generated.
At this time, if the ITO film dent was not observed with the naked eye, it was judged to be: poor: when it was observed with naked eyes.
5. Confirm adhesion of protective film
The protective films prepared in Examples 1 to 2 and Comparative Examples 1 to 12 were laminated to a general PET film, and then whether or not the films were adhered to each other after heat treatment at 150 ° C for 1 hour was classified by whether they were oil or not.
At this time, when the adhesion of the protective film was observed at a level free from peeling, x: good, peeling was observed, and x: poor.
As shown in Table 3, the protective films prepared in Comparative Examples 1 and 2 had a glass transition temperature of -50 DEG C or higher, but no plasticizer, The dent phenomenon of the film occurred. According to the content of the curing agent prepared in Comparative Examples 3 and 4, the PSA residual component was observed while maintaining the proper glass transition temperature of the protective film. In Comparative Examples 5 and 6, It was confirmed that the adhesion of the protective film, the increase of the adhesive strength and the transfer of the pressure-sensitive adhesive were caused by the change of the thickness of the pressure-sensitive adhesive. In Comparative Examples 7 to 10, the protective film prepared according to the drying temperature and the drying time was satisfactory in the adhesive property. However, according to the heat shrinkage of the PET film after the heat treatment, the ITO film Curl after jointing occurred.
The protective film prepared in Comparative Example 11 exhibited a high adhesive strength after heat treatment when the glass transition temperature was too low even though the adhesive layer had an optimum range of thickness depending on whether the adhesive composition was optimal or not, and adhesive transfer occurred. Also, it was confirmed through the protective film prepared in Comparative Example 12 that the adhesiveness with the ITO film after the heat treatment was deteriorated when the glass transition temperature was too high even if the adhesive layer had an appropriate range of thickness.
From the above results, the protective film of the present invention was prepared by using 0.2 to 10 parts by weight of a curing agent and 1 to 3 parts by weight of a plasticizer as a pressure-sensitive adhesive composition with respect to 100 parts by weight of a polymer resin, The drying temperature is 120 to 170 DEG C, and the drying time is 1 to 3 minutes.
The protective film prepared in Examples 1 and 2 satisfying these conditions had a glass transition temperature of -50 DEG C or higher and an adhesive strength of 100 gf / 25 mm or less, suppressing the increase of adhesive strength, minimizing the residual component during the transfer of the pressure- The curl height of the film was 10 mm or less, and no dent phenomenon of the ITO film was observed.
As described above, the present invention is free from tacky residue, easy to control the adhesive force, and does not cause curling of the ITO film after the heat treatment at a high temperature of 130 to 160 ° C. for the touch screen panel process. Particularly, Thereby providing an ITO heat-resistant protective film with improved dent phenomenon.
The present invention relates to a pressure-sensitive adhesive composition comprising a curing agent and a plasticizer to improve the heat resistance and flexibility of an acrylic polymer resin polymerized by mixing two kinds of soft acrylic monomers and hard monomers having different glass transition temperatures (Tg) And the desired physical properties can be achieved in the ITO heat-resistant protective film by optimizing the conditions.
Thus, according to the present invention, it is possible to suppress an increase in adhesion force generated after heat treatment in a touch screen panel process, eliminate the transfer of the pressure-sensitive adhesive, minimize the curling of the ITO film, eliminate the dent phenomenon of the ITO film, The productivity of the screen panel process can be improved and the defect rate of the touch screen panel can be reduced.
While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
1: substrate layer, 2: adhesive layer, 3: release layer
Claims (10)
Based on 100 parts by weight of a soft acrylic monomer having a glass transition temperature of 0 ° C or lower, a hard monomer having a glass transition temperature of 0 ° C or higher and an acrylic crosslinked monomer polymerized, 0.2 to 10 parts by weight of a curing agent and 1 to 3 parts by weight of a plasticizer (2) composed of a pressure-sensitive adhesive composition and
And a release layer (3).
70 to 98% by weight, alone or in a mixture of two or more, selected from soft acrylic monomers having a glass transition temperature of 0 DEG C or lower,
1 to 20% by weight of a mixture of two or more types selected from the group consisting of hard monomers having a glass transition temperature of 0 ° C or higher and
Wherein the acrylic-based crosslinking monomer is polymerized in an amount of 1 to 10% by weight.
2) applying the pressure-sensitive adhesive composition on the base layer and performing the drying at a temperature of 120 to 170 캜 for 1 to 3 minutes for drying to form an adhesive layer,
(3) The method for producing an ITO heat-resistant protective film according to (1), which comprises laminating a release layer on the pressure-sensitive adhesive layer.
70 to 98% by weight, alone or in combination of two or more, selected from soft acrylic monomers having a glass transition temperature of 0 DEG C or lower,
1 to 20% by weight, alone or in a mixture of two or more, selected from the group consisting of hard monomers having a glass transition temperature of 0 ° C or higher, and
1 to 10% by weight of an acrylic crosslinking monomer has a weight average molecular weight of 300,000 to 2,000,000 by a polymerization reaction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130155244A KR20150069157A (en) | 2013-12-13 | 2013-12-13 | Ito heat-protecting film for processing touch screen panel and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020130155244A KR20150069157A (en) | 2013-12-13 | 2013-12-13 | Ito heat-protecting film for processing touch screen panel and manufacturing method thereof |
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| KR20150069157A true KR20150069157A (en) | 2015-06-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776562A (en) * | 2018-05-02 | 2018-11-09 | 江苏迪佳电子有限公司 | A kind of capacitance touch screen production method |
| KR20200003616A (en) * | 2018-07-02 | 2020-01-10 | 도레이첨단소재 주식회사 | Adhesive protective film for exposure process |
| CN110903588A (en) * | 2019-12-02 | 2020-03-24 | 苏州泰仑电子材料有限公司 | Low-silicon transfer silica gel pressure-sensitive adhesive protective film |
-
2013
- 2013-12-13 KR KR1020130155244A patent/KR20150069157A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776562A (en) * | 2018-05-02 | 2018-11-09 | 江苏迪佳电子有限公司 | A kind of capacitance touch screen production method |
| KR20200003616A (en) * | 2018-07-02 | 2020-01-10 | 도레이첨단소재 주식회사 | Adhesive protective film for exposure process |
| CN110903588A (en) * | 2019-12-02 | 2020-03-24 | 苏州泰仑电子材料有限公司 | Low-silicon transfer silica gel pressure-sensitive adhesive protective film |
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