KR101906638B1 - Adhesive composition for touch panel, adhesive film and touch panel - Google Patents
Adhesive composition for touch panel, adhesive film and touch panel Download PDFInfo
- Publication number
- KR101906638B1 KR101906638B1 KR1020140131875A KR20140131875A KR101906638B1 KR 101906638 B1 KR101906638 B1 KR 101906638B1 KR 1020140131875 A KR1020140131875 A KR 1020140131875A KR 20140131875 A KR20140131875 A KR 20140131875A KR 101906638 B1 KR101906638 B1 KR 101906638B1
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- KR
- South Korea
- Prior art keywords
- sensitive adhesive
- touch panel
- pressure
- acid
- adhesive composition
- Prior art date
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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
-
- 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
Abstract
(Meth) acrylic ester monomer, and an acrylic resin formed by polymerization of an acid monomer, wherein the acrylic resin has a glass transition temperature of -35 ° C to -5 ° C.
And a pressure-sensitive adhesive layer which is a cured product of the pressure-sensitive adhesive composition for a touch panel.
A conductive plastic film having a conductive layer on one surface thereof; And a pressure sensitive adhesive layer adhered to the conductive layer and including a cured product of the pressure sensitive adhesive composition for a touch panel.
Description
A pressure-sensitive adhesive composition for a touch panel, an adhesive film, and a touch panel.
2. Description of the Related Art In recent years, electronic devices such as a PDA, a mobile communication terminal, or a navigation system for a vehicle have formed a large market. In such electronic devices, the technical goals pursued are mainly thinning, lightening, low power consumption, high resolution and high brightness.
On the other hand, a transparent conductive plastic film is used as an electronic device provided with a touch screen or a touch panel switch on the input operation section for lightening and preventing breakage. An example of such a film is a film made of a polyethylene terephthalate (PET) film as a substrate, and a conductive layer such as indium tin oxide (ITO) is formed on one surface of the film. Glass, a reinforcing material or a deco film.
An embodiment of the present invention provides a pressure-sensitive adhesive composition for a touch panel, which is less deformed in shape with respect to external stimuli such as pressing and stamping, and is excellent in reliability.
Another embodiment of the present invention provides an adhesive film using the pressure-sensitive adhesive composition for a touch panel.
Another embodiment of the present invention provides a touch panel to which the adhesive film is applied.
In one embodiment of the present invention, there is provided an acrylic resin composition, which comprises an acrylic resin formed by polymerizing a (meth) acrylic acid ester monomer and an acid monomer, wherein the acrylic resin has a glass transition temperature (Tg) of about -35 ° C to about -5 ° Sensitive adhesive composition for a touch panel.
The (meth) acrylate monomer may be alkyl (meth) acrylate, and the alkyl (meth) acrylate may be linear or branched C1 to C14 alkyl.
The acid monomer may be at least one selected from the group consisting of acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, and combinations thereof.
The acid monomer may be polymerized in an amount of about 7 parts by weight to about 20 parts by weight based on 100 parts by weight of the (meth) acrylate monomer.
The acrylic resin may have a weight average molecular weight of about 1,000 to about 300.
And may further include about 0.5 to about 2 parts by weight of additives relative to 100 parts by weight of the acrylic resin.
The additive may include a curing agent comprising melamine, carobodimine, oxazolidone, aziridine, urea, epoxy functional groups.
In another embodiment of the present invention, there is provided an adhesive film comprising a pressure-sensitive adhesive layer which is a cured product of the pressure-sensitive adhesive composition for a touch panel.
The storage modulus (G ') of the pressure-sensitive adhesive layer at about 25 ° C may be from about 1.4X10 5 Pa to about 2.0 X10 5 Pa.
The thickness of the pressure-sensitive adhesive layer may be about 10 탆 to about 50 탆.
In another embodiment of the present invention, a conductive plastic film having a conductive layer on one side thereof; And a pressure sensitive adhesive layer adhered to the conductive layer and including a cured product of the pressure sensitive adhesive composition for a touch panel.
The conductive plastic film may be a polyethylene terephthalate film formed on one side of the ITO (conductive metal oxide) layer.
The pressure-sensitive adhesive composition for a touch panel has very few deformations in shape against external stimuli such as pressing and stamping, and is excellent in reliability against cloudiness.
The pressure-sensitive adhesive film does not generate bubbles even when left in a high-temperature and high-humidity atmosphere for a long period of time, and exhibits excellent adhesion even in a thin thickness.
1 is a schematic cross-sectional view of a touch panel according to one embodiment of the present invention.
2 is a schematic cross-sectional view of a touch panel according to other embodiments of the present invention.
Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.
In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.
In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.
Hereinafter, the formation of any structure in the "upper (or lower)" or the "upper (or lower)" of the substrate means that any structure is formed in contact with the upper surface (or lower surface) of the substrate However, the present invention is not limited to not including other configurations between the substrate and any structure formed on (or under) the substrate.
For touch panel
Pressure-sensitive adhesive composition
In one embodiment of the present invention, there is provided a touch panel comprising a (meth) acrylic acid ester monomer and an acrylic resin formed by polymerization of an acid monomer, wherein the acrylic resin has a glass transition temperature of -35 ° C to -5 ° C A pressure-sensitive adhesive composition is provided.
Generally, when a pressure-sensitive adhesive layer formed by a pressure-sensitive adhesive composition is applied to a base material for a touch panel, the surface of the pressure-sensitive adhesive layer is liable to be struck or pressed, The deformation of the pressure-sensitive adhesive layer by the stimulation can lower the process yield in the production of the product and increase the defective rate of the product in appearance.
The pressure sensitive adhesive composition for a touch panel of the present invention has a hardness of at least a certain level, and even if there is an external stimulus on the pressure sensitive adhesive film coated with the pressure sensitive adhesive layer, the pressure sensitive adhesive composition for a touch panel is less likely to be pressed, Bubbles are not generated and the whitening phenomenon does not occur, thereby realizing excellent reliability.
Specifically, the pressure-sensitive adhesive composition for a touch panel may include a (meth) acrylate monomer and an acrylic resin formed by polymerizing an acid monomer, and the content of the acid monomer and the glass transition temperature , The pressure-sensitive adhesive layer formed by the pressure-sensitive adhesive composition can ensure hardness and storage elastic modulus (G ') higher than a certain level.
In the case of polymerizing the (meth) acrylic acid ester-based monomer and the acid monomer, the acrylic resin formed by the polymerization due to the strong cohesive force of the acid monomer and the high glass transition temperature of the (meth) acrylic acid ester- Thus, deformation due to external stimulation can be minimized, and adhesion can be improved by increasing the polarity.
The glass transition temperature (Tg) of the acrylic resin may be about -35 ° C to about -5 ° C. The higher the glass transition temperature of the acrylic resin, the greater the hardness of the acrylic resin. Accordingly, when the glass transition temperature is within the above range, the acrylic resin can maintain a glossy state.
On the other hand, when the glass transition temperature is higher than about -5 [deg.] C, the acrylic resin may remain in an excessively hard form so that its behavior is limited, and adhesion and wettability may be deteriorated. The adhesive performance may be insignificant.
The (meth) acrylic acid ester monomer may be, for example, alkyl (meth) acrylate, but is not limited thereto. The alkyl of the alkyl (meth) acrylate may be linear or branched C1-C14 alkyl, specifically C1-C8 alkyl. The alkyl (meth) acrylate having the carbon number within the range described above can be used to adjust the cured product of the pressure-sensitive adhesive composition for a touch panel to have appropriate cohesive force, peel strength and adhesive property.
Specifically, when the (meth) acrylic ester monomer is selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) (Meth) acrylate, 2-ethylbutyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (Meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, tetradecyl (meth) acrylate and combinations thereof. .
The acid monomer may be at least one selected from the group consisting of acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, and combinations thereof. For example, the acid monomers can be acid monomers which can be polymerized by free radicals in the form of unsaturated carboxylic acids, maleic acid, crotonic acid, isophthalic acid and fumaric acid, which are known in the art, It is advantageous to use methacrylic acid or acrylic acid.
The acid monomer may be polymerized in an amount of about 7 parts by weight to about 20 parts by weight based on 100 parts by weight of the (meth) acrylate monomer. The glass transition temperature of the acrylic resin may be controlled according to the content of the acid monomer. Thus, as described above, it is advantageous for the glass transition temperature to be maintained at about -35 ° C to about -5 ° C. For the implementation of the glass transition temperature, the acid monomer may be present in an amount of from about 7 parts by weight to about 20 parts by weight Can be polymerized.
Specifically, when the acid monomer is polymerized out of the above range, the resin may aggregate due to hydrogen bonding of the acid monomer and the coating performance may be deteriorated. As a result, the acrylic resin having excellent reliability and adhesion can be obtained .
The weight average molecular weight of the acrylic resin may be about 1 million g / mol to about 3 million g / mol. When the molecular weight of the acrylic resin exceeds about 3,000,000 g / mol, there is a problem that the specific gravity of the pressure-sensitive adhesive composition increases. When the molecular weight is less than 1,000,000 g / mol, the durability may be poor. Therefore, it is advantageous in that the strength of the composition can be maintained by maintaining the molecular weight of the acrylic resin within the above range.
And about 0.5 to about 2 parts by weight of an additive may be further added to 100 parts by weight of the acrylic resin. If the additive is less than about 0.5 parts by weight, the adhesion and adhesion may be deteriorated. If the additive is more than about 2 parts by weight, the remaining additives may not affect the durability.
The additive may include a curing agent comprising melamine, carobodimine, oxazolidone, aziridine, urea, epoxy functional groups.
The additive may further include an adhesion promoter, a thermosetting monomer, an antioxidant, and the like.
For example, the adhesion promoter is added in order to polymerize the monomers contained in the pressure-sensitive adhesive composition together and to improve the level of the pressure-sensitive adhesive. By adding the pressure-sensitive adhesive, the pressure-sensitive adhesive property can be improved and the polarity is decreased, The whitening phenomenon of the pressure-sensitive adhesive composition applied to the liquid crystal display device can be suppressed.
Adhesive film
In another embodiment of the present invention, it is possible to provide an adhesive film comprising a pressure-sensitive adhesive layer which is a cured product of the pressure-sensitive adhesive composition for a touch panel.
In curing the pressure-sensitive adhesive composition for a touch panel, curing by heat is advantageous in consideration of the curing rate, ease of obtaining the irradiation apparatus, price, and the like. For example, the composition coated on the substrate layer at a temperature of about 100 ° C or higher can be cured for about 3 minutes or more through the conveyor belt, and heat treatment can be performed by putting it in a matis oven or the like, Can be dried at a constant temperature to form a pressure-sensitive adhesive layer having a uniform surface.
The above-mentioned pressure sensitive adhesive layer is a cured product of the acrylic resin described above and has hardness higher than ordinary pressure sensitive adhesive layer hardness, so that it is possible to minimize changes in external stimuli such as sticking and pressing. As described later, the hardness can be maintained within the above-mentioned range when the acrylic resin has a glass transition temperature of about -35 ° C to -5 ° C.
The storage modulus (G ') of the pressure-sensitive adhesive layer was measured by applying a constant force to the pressure-sensitive adhesive layer while changing the temperature by an ARES instrument (Theometric Scientific). The larger the storage elastic modulus means the greater the elasticity of the pressure-sensitive adhesive layer, and the larger the storage elastic modulus is, the more the suppressing property against external pressure can be exhibited. Specifically, the pressure-sensitive adhesive layer can minimize the deformation due to an external stimulus by maintaining a storage modulus of about 1.4X10 5 Pa to about 2.0X10 5 Pa at 25 ° C. If it is less than about 1.4 x 10 < 5 > Pa, pressing phenomenon and stamping phenomenon can easily occur. If the storage elastic modulus exceeds about 2.0X10 < 5 > Pa, the flexibility of the pressure sensitive adhesive layer is very low, Lifting phenomenon may occur and durability may be lowered. The storage elastic modulus G 'of the pressure-sensitive adhesive layer may be about 1.4 × 10 5 Pa at 25 ° C, for example.
The pressure-sensitive adhesive layer is a cured product of the above-mentioned acrylic resin, and the acrylic resin is formed by polymerization of an acid monomer, and hardness, durability and storage elastic modulus of a certain level or higher can be secured.
The thickness of the pressure-sensitive adhesive layer may be about 10 탆 to about 50 탆. Typically, the pressure-sensitive adhesive layer should have a thickness of about 25 μm or more to exhibit adhesiveness. However, since the pressure-sensitive adhesive layer includes the cured product of the above-described pressure-sensitive adhesive composition for a touch panel, the thickness of the pressure- It is possible to maintain excellent durability and adhesiveness.
In addition, since the pressure-sensitive adhesive layer has a thickness within the above range, the pressure-sensitive adhesive layer can be applied to a touch panel or a touch screen, and an adhesive film having excellent durability can be realized.
Touch panel
In another embodiment of the present invention, a conductive plastic film having a conductive layer on one side thereof; And a pressure sensitive adhesive layer adhered to the conductive layer and including a cured product of the pressure sensitive adhesive composition for a touch panel.
1, the
The touch panel may be, for example, a capacitive touch panel. The specific structure of the touch panel or a method for forming the touch panel is not particularly limited as long as the above-described pressure-sensitive adhesive composition for a touch panel is applied, and a general structure in this field can be employed.
The specific kind of the
More specifically, the
Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.
< Example And Comparative Example >
Example One
65 parts by weight of 2-EHA (ethylhexyl acrylate), 25 parts by weight of IBOA (isobornyl acrylate) and 10 parts by weight of acrylic acid To obtain an acrylic resin having a molecular weight of 1 million g / mol and a glass transition temperature of -23 ° C.
0.5 part by weight of an aziridine curing agent and 0.8 parts by weight of a silane coupling agent as an additive were prepared based on 100 parts by weight of the acrylic resin thus formed.
The coating solution was prepared by mixing toluene as a solvent in the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive layer was thermally cured on a polyethylene terephthalate film (thickness: 75 탆) Respectively. Thereafter, it was placed in Matisse 5 minutes and heat-treated at 100 ° C for 5 minutes to form a pressure-sensitive adhesive film.
Example 2
A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that an acrylic resin having a molecular weight of 1,000,000 g / mol and a glass transition temperature of -23 ° C was formed by using 10 parts by weight of methacrylic acid instead of acrylic acid .
Comparative Example One
A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that an acrylic resin was not formed but acrylic acid was not included.
Comparative Example 2
Except that 10 parts by weight of HEA (hydroxyethyl acrylate) was used instead of acrylic acid to form an acrylic resin having a molecular weight of 1 million g / mol and a glass transition temperature of -23 ° C. To prepare an adhesive film.
Comparative Example 3
A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that an acrylic resin having a molecular weight of 1 million g / mol and a glass transition temperature of -38 ° C was formed containing 5 parts by weight of acrylic acid.
<
Experimental Example
> - Physical properties of adhesive film
1) Measurement of white turbidity and bubble generation: The adhesive film adhered to the glass at 85 ° C and 85% RH was stored for 200 hours to observe whether white spots were observed or bubbles were generated.
2) Adhesive force measurement: The adhesive film was made to be 25
3) Hardness (or durability): A PET film having a thickness of 50 탆 was laminated on the pressure-sensitive adhesive layer of the pressure-sensitive adhesive film, and a load of 200 g was applied to the PET film at a rate of 1.0 mm / min using a text analyzer, The film depth of the film was measured.
4) Storage elastic modulus: The storage elastic modulus was measured by applying a force to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive film with a jig using an ARES instrument (Theometric Scientific) at 25 ° C.
Referring to Table 2, the whitening phenomenon of the adhesive films of Examples 1 and 2 did not occur and bubbles were not generated, whereas the whitening phenomenon occurred in the adhesive films of Comparative Examples 1 and 2, bubbles were generated, The adhesive strength was also lower than those of Examples 1 and 2.
The hardness and the storage elastic modulus values of Examples 1 and 2 were higher than those of Comparative Examples 1 to 3, and it was confirmed that the examples were less deformed by external stimuli than the Comparative Examples. In Comparative Example 3, whitish and bubble generation phenomena are good, but the glass transition temperature and storage elastic modulus are low, and the depressed depth is deep so that deformation due to external stimulation is large.
100, 200: Touch panel
10: pressure-sensitive adhesive layer, 20: conductive layer
30: plastic substrate layer, 40: conductive plastic film
Claims (12)
The acid monomer is polymerized in an amount of 7 to 20 parts by weight based on 100 parts by weight of the (meth) acrylate monomer,
Wherein the acrylic resin has a glass transition temperature (Tg) of -35 ° C to -5 ° C
Sensitive adhesive composition for a touch panel.
Wherein the acid monomer is at least one selected from the group consisting of acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, fumaric acid, maleic acid and itaconic acid
Sensitive adhesive composition for a touch panel.
The weight average molecular weight of the acrylic resin is from 1 million to 3 million
Sensitive adhesive composition for a touch panel.
Further comprising 0.5 to 2 parts by weight of an additive to 100 parts by weight of the acrylic resin
Sensitive adhesive composition for a touch panel.
Wherein the additive comprises a curing agent comprising melamine, carobodiimine, oxazolidone, aziridine, urea, and epoxy functional groups
Sensitive adhesive composition for a touch panel.
Adhesive film.
The storage modulus (G ') of the pressure-sensitive adhesive layer at 25 ° C of 1.4X10 5 Pa to 2.0 X10 5 Pa
Adhesive film.
When the thickness of the pressure-sensitive adhesive layer is 10 [mu] m to 50 [
Adhesive film.
And a pressure-sensitive adhesive layer adhered to the conductive layer and including a cured product of the pressure-sensitive adhesive composition for a touch panel according to any one of claims 1, 3, and 5 to 7
Touch panel.
The conductive plastic film may be a polyethylene terephthalate film formed on one surface of the conductive metal oxide layer
Touch panel.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140131875A KR101906638B1 (en) | 2014-09-30 | 2014-09-30 | Adhesive composition for touch panel, adhesive film and touch panel |
| PCT/KR2015/010041 WO2016052917A1 (en) | 2014-09-30 | 2015-09-23 | Adhesive composition for touch panels, adhesive film, and touch panel |
| TW104131894A TW201619328A (en) | 2014-09-30 | 2015-09-25 | Adhesive composition for touch panel, adhesive film and touch panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140131875A KR101906638B1 (en) | 2014-09-30 | 2014-09-30 | Adhesive composition for touch panel, adhesive film and touch panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20160039063A KR20160039063A (en) | 2016-04-08 |
| KR101906638B1 true KR101906638B1 (en) | 2018-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020140131875A KR101906638B1 (en) | 2014-09-30 | 2014-09-30 | Adhesive composition for touch panel, adhesive film and touch panel |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101906638B1 (en) |
| TW (1) | TW201619328A (en) |
| WO (1) | WO2016052917A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190044426A (en) | 2017-10-20 | 2019-04-30 | 주식회사 엘지화학 | Adhesive composition and adhesive film comprising the cured product thereof |
| KR102324617B1 (en) * | 2018-10-31 | 2021-11-09 | 주식회사 엘지화학 | Adhesive composition and optical member comprising adhesive composition or cured product of thereof |
| KR102488314B1 (en) * | 2018-12-27 | 2023-01-13 | 주식회사 두산 | Non-conductive adhesive film for semiconductor package and method for manufacturing semiconductor packag using the same |
| KR102376882B1 (en) * | 2021-02-10 | 2022-03-21 | (주)이녹스첨단소재 | Adhesive sheet for display |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110072119A (en) * | 2009-12-22 | 2011-06-29 | 유티스 주식회사 | Composition for photo-curable transparent adhesive, double-sided adhesive sheet manufactured therefrom, and method for manufacturing the sheet |
| KR101625228B1 (en) * | 2010-04-05 | 2016-05-27 | (주)엘지하우시스 | Pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet and touch panel |
| KR101542285B1 (en) * | 2010-10-20 | 2015-08-07 | 주식회사 엘지화학 | Pressure-sensitive adhesive composition for touch panel |
| KR101594210B1 (en) * | 2012-07-11 | 2016-02-15 | (주)엘지하우시스 | Adhesive composition for optical film |
| KR101542620B1 (en) * | 2012-12-20 | 2015-08-06 | 제일모직주식회사 | Adhesive film for polarizing plate, adhesive composition for the same, polarizing plate comprising adhesive layer including the same and display apparatus comprising the same |
-
2014
- 2014-09-30 KR KR1020140131875A patent/KR101906638B1/en active IP Right Grant
-
2015
- 2015-09-23 WO PCT/KR2015/010041 patent/WO2016052917A1/en active Application Filing
- 2015-09-25 TW TW104131894A patent/TW201619328A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TW201619328A (en) | 2016-06-01 |
| WO2016052917A1 (en) | 2016-04-07 |
| KR20160039063A (en) | 2016-04-08 |
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