KR20170086741A - Adhesive composition for touch panel and adhesive film - Google Patents
Adhesive composition for touch panel and adhesive film Download PDFInfo
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- KR20170086741A KR20170086741A KR1020160005908A KR20160005908A KR20170086741A KR 20170086741 A KR20170086741 A KR 20170086741A KR 1020160005908 A KR1020160005908 A KR 1020160005908A KR 20160005908 A KR20160005908 A KR 20160005908A KR 20170086741 A KR20170086741 A KR 20170086741A
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- acrylate
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- sensitive adhesive
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Classifications
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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
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
-
- 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
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- 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
- C09J7/00—Adhesives in the form of films or foils
Abstract
Sensitive adhesive composition for a touch panel and a pressure-sensitive adhesive sheet which are excellent in adhesion performance and level difference absorbency.
The pressure-sensitive adhesive composition according to the present invention comprises a first resin having a weight average molecular weight of 1,000,000 to 3,000,000 and a second resin having a weight average molecular weight of 1,000 to 200,000, wherein each of the first resin and the second resin has a cyclic structure (Meth) acrylate having a hydroxyl group and a hydroxyl group, an organic solvent and a photoinitiator.
Description
The present invention relates to a pressure-sensitive adhesive composition, and more particularly, to a pressure-sensitive adhesive composition for a touch panel and a pressure-sensitive adhesive sheet which are excellent in pressure-sensitive adhesive performance and step-difference absorbency.
The pressure-sensitive adhesive is used in a wide variety of applications such as sheets, films, and tapes. In order to bond components in the electrical or electronics industry, or in particular to bond two or more different materials or parts together, a pressure sensitive adhesive is used which is highly adhesive. Specifically, the display comprises a touch screen panel (TSP) and a liquid crystal module, and the touch screen panel has a laminated structure of a conductive film and a transparent substrate. At this time, an adhesive is used when each layer is attached to the laminated structure of the touch screen panel, and a pressure-sensitive adhesive is also used when the touch screen panel and the liquid crystal module are attached.
As an example thereof, there is a conductive film formed of indium tin oxide (ITO) on one side of a substrate made of polyethylene terephthalate (PET) film. An adhesive film having a pressure-sensitive adhesive layer formed on one side of the conductive film is laminated on a conductive glass, a reinforcing material, a decoupled film or the like.
As described above, the pressure-sensitive adhesive used for attaching the transparent conductive film in the touch screen panel is required to have various physical properties such as a step difference absorbency capable of absorbing a printed step difference, and a durability capable of suppressing the occurrence of a cloudiness phenomenon.
A related art related to the present invention is Korean Patent Laid-Open Publication No. 10-2014-0121922 (published on October 17, 2014), which discloses a pressure-sensitive adhesive composition for a touch panel, an adhesive film and a touch panel.
An object of the present invention is to provide a pressure-sensitive adhesive composition for a touch panel excellent in adhesion performance and level difference absorbency.
Another object of the present invention is to provide a pressure-sensitive adhesive sheet produced using the pressure-sensitive adhesive composition.
To attain the above object, the pressure-sensitive adhesive composition according to the present invention comprises a first resin having a weight average molecular weight of 1,000,000 to 3,000,000 and a second resin having a weight average molecular weight of 1,000 to 200,000, And the second resin are each an acrylic copolymer resin polymerized from a mixed monomer containing (meth) acrylate having a cyclic structure, an organic solvent and a photoinitiator.
The first resin may include 5 to 50% by weight of (meth) acrylate having a cyclic structure with respect to 100% by weight of the mixed monomer.
The second resin may include 50 to 90% by weight of (meth) acrylate having a cyclic structure with respect to 100% by weight of the mixed monomer.
The content of the second resin may be 5 to 20 parts by weight based on 100 parts by weight of the first resin.
The (meth) acrylate having a cyclic structure may be selected from the group consisting of 2-phenoxyethyl (meth) acrylate, ethoxylate phenoxy (meth) acrylate, 3,3,5- trimethylcyclohexane (Meth) acrylate, benzyl (meth) acrylate, isobonyl (meth) acrylate, and cyclohexyl (meth) acrylate.
The photoinitiator may include at least one of a benzoin compound, a hydroxy ketone compound, an amino ketone compound, and a phosphine oxide compound.
The pressure-sensitive adhesive sheet according to the present invention for achieving the above-mentioned other objects is a pressure-sensitive adhesive sheet obtained from a pressure-sensitive adhesive composition comprising a first resin having a weight average molecular weight of 1,000,000 to 3,000,000 and a second resin having a weight average molecular weight of 1,000 to 200,000 Wherein each of the first resin and the second resin comprises a mixed monomer comprising (meth) acrylate having a cyclic structure, an acrylic copolymer resin polymerized from an organic solvent and a photoinitiator
.
At this time, the pressure sensitive adhesive sheet may have a step difference absorbency of 10 to 30%.
The thickness of the adhesive sheet may be 50 to 200 mu m.
The pressure-sensitive adhesive composition for a touch panel and the pressure-sensitive adhesive sheet according to the present invention have an excellent adhesive property and a step difference absorbability by the first resin and the second resin having different weight average molecular weights.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
Hereinafter, a pressure-sensitive adhesive composition for a touch panel and a pressure-sensitive adhesive sheet according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An adhesive sheet formed from a composition comprising a first resin and a second resin having different weight average molecular weights is attached between a touch panel and a liquid crystal module and exhibits excellent adhesive performance and step absorbability when applied.
The pressure sensitive adhesive composition for a touch panel of the present invention comprises a first resin having a weight average molecular weight of 1,000,000 to 3,000,000 and a second resin having a weight average molecular weight of 1,000 to 200,000.
Each of the first resin and the second resin is an acrylic copolymer resin, and is a resin formed by polymerization from a mixed monomer containing (meth) acrylate having a cyclic structure, an organic solvent, and a photoinitiator.
Since the first resin and the second resin are acrylic copolymer resins having different weight average molecular weights, when they are mixed, there is an effect of excellent processability and step difference absorbency.
The first resin is an acrylic copolymer resin having a weight average molecular weight of 1,000,000 to 3,000,000, which is a resin formed by polymerization from a mixed monomer containing a (meth) acrylate having a cyclic structure, an organic solvent and a photoinitiator.
Such an acrylic copolymer resin having a high molecular weight can be produced by photopolymerization instead of thermal polymerization, and polymerization is possible at room temperature, so that polymerization reaction is easily controlled and productivity is excellent.
The mixed monomer includes (meth) acrylate having a cyclic structure.
The (meth) acrylate having a cyclic structure may be selected from the group consisting of 2-phenoxyethyl (meth) acrylate, ethoxylate phenoxy (meth) acrylate, 3,3,5- trimethylcyclohexane (Meth) acrylate, benzyl (meth) acrylate, isobonyl (meth) acrylate, and cyclohexyl (meth) acrylate.
The first resin may include 5 to 50% by weight of (meth) acrylate having a cyclic structure with respect to 100% by weight of the mixed monomer.
When the content of the (meth) acrylate is less than 5% by weight, the cohesive force inside the pressure sensitive adhesive sheet is lowered, and the curing degree and the adhesive performance are deteriorated. On the other hand, when the content exceeds 50% by weight, the curing degree of the pressure-sensitive adhesive sheet becomes excessively high, and the properties such as peel strength are deteriorated.
The mixed monomer may include, in addition to the (meth) acrylate having a cyclic structure, a monomer having a hydrophilic functional group such as a monomer having a carboxyl group as a monomer having a hydroxy group. And 4-hydroxybutyl acrylate (4-HBA) as a monomer having a hydrophilic functional group. Further, it may include an alkyl (meth) acrylate having a branched alkyl group having 1 to 22 carbon atoms capable of imparting softness to the pressure-sensitive adhesive composition. The alkyl (meth) acrylate having a branched alkyl group having 1 to 22 carbon atoms is preferably selected from the group consisting of isopropyl (meth) acrylate, t-butyl (meth) acrylate, sec- (Meth) acrylate, 2-ethylbutyl (meth) acrylate, isooctyl (meth) acrylate and isononyl (meth) acrylate.
The organic solvent is preferably a solvent having a volatilization temperature of about 100 DEG C or less in consideration of the drying time and the reaction temperature. The content of the organic solvent may be adjusted in consideration of physical properties and moldability of the pressure-sensitive adhesive composition, and may be about 1 to 10 parts by weight based on 100 parts by weight of the first resin. Examples of the organic solvent include ethyl ether, acetone, acetonitrile, petroleum ether, isopropyl alcohol, methanol, ethanol, n-pentane, n-hexane, benzene, dichloromethane, trichloromethane, methyl acetate, ethyl acetate, Ether, methyl ethyl ketone, trichloromethane, tetrachloromethane, 1,2-dichloroethane and the like.
The photoinitiator is a substance that initiates a curing reaction by causing an active reaction when irradiating light of a certain light quantity. The photoinitiator may include at least one of a benzoin compound, a hydroxy ketone compound, an amino ketone compound, and a phosphine oxide compound.
The photoinitiator may include, but is not limited to, 0.1 to 10 parts by weight based on 100 parts by weight of the first resin.
As described above, the first resin is an acrylic copolymer resin having a weight average molecular weight of 1,000,000 to 3,000,000, and has a high cohesive strength at room temperature, and therefore, has excellent processability. In addition, it can provide mechanical strength and stable physical properties in the range of 1,000,000 to 3,000,000 and is excellent in durability even in a high temperature (85 ° C) and high humidity (85%) environment and can suppress cloudiness or bubble formation .
The second resin is an acrylic copolymer resin having a weight average molecular weight of 1,000 to 200,000, which is a resin formed by polymerization from a mixed monomer containing a (meth) acrylate having a cyclic structure, an organic solvent and a photoinitiator. The second resin has a ductility property at a high temperature of 85 캜 or higher. Therefore, the pressure-sensitive adhesive sheet formed by mixing the first resin and the second resin exhibits excellent step difference absorbency.
The mixed monomer includes (meth) acrylate having the cyclic structure. The (meth) acrylate having an annular structure, the organic solvent and the photoinitiator may be as described above.
The second resin may include 50 to 90% by weight of (meth) acrylate having a cyclic structure with respect to 100% by weight of the mixed monomer.
When the content of the (meth) acrylate is less than 50% by weight, securing the softness for obtaining excellent step difference absorbability of the pressure-sensitive adhesive sheet is insufficient. On the other hand, when the content exceeds 90% by weight, the curing degree of the pressure-sensitive adhesive sheet becomes excessively high, and thus the physical properties such as peel strength are deteriorated.
The pressure-sensitive adhesive composition preferably comprises 5 to 20 parts by weight of the second resin relative to 100 parts by weight of the first resin. The first resin and the second resin are mixed and then cured, whereby excellent adhesive performance and workability of the adhesive sheet can be secured. When the content of the second resin is out of the range of 5 to 20 parts by weight, the step difference absorbability of the pressure-sensitive adhesive sheet may be lowered.
The composition in which the first resin and the second resin of the present invention are mixed can be polymerized at a composition ratio within the above-mentioned range and can be made into a transparent sheet by a method such as extrusion molding. The pressure-sensitive adhesive sheet containing an acrylic copolymer resin is excellent in transparency, heat resistance, bending strength and hardness while maintaining a light transmittance of about 90% or more. Accordingly, the pressure sensitive adhesive sheet applied to the touch panel exhibits an excellent optical performance so as to replace the glass substrate of the touch panel, while exhibiting excellent adhesive performance and step difference absorbability.
The pressure sensitive adhesive sheet according to the present invention comprises a cured product formed from a pressure sensitive adhesive composition in which a first resin having a weight average molecular weight of 1,000,000 to 3,000,000 and a second resin having a weight average molecular weight of 1,000 to 200,000 are mixed. Here, each of the first resin and the second resin is as described above with respect to the acrylic copolymer resin polymerized from the mixed monomer containing (meth) acrylate having a cyclic structure, the organic solvent and the photoinitiator.
The pressure-sensitive adhesive sheet may have a step difference absorbency of 10 to 30%.
The ratio of the step that can be absorbed by the adhesive sheet to the total thickness of the adhesive sheet may be 10 to 30%. That is, the step difference absorbency measured by the following formula 1 may be 10 to 30%. The step difference absorbency of the pressure-sensitive adhesive sheet satisfies the above-described range, so that it is applied to a display to exhibit excellent adhesive performance and step difference absorbency.
[Formula 1]
Level difference absorbency (%) = (total thickness of absorbable maximum level difference / adhesive sheet) x 100
The thickness of the adhesive sheet may be 50 to 200 mu m.
The pressure-sensitive adhesive sheet can be stably held in the thickness range shown. When the thickness is less than 50 mu m, the thickness is too thin, so that the step difference absorbing effect of the adhesive sheet is insufficient. When the thickness exceeds 200 mu m, the transparency of the adhesive sheet may be somewhat lowered.
Specific examples of the pressure-sensitive adhesive composition for a touch panel and the pressure-sensitive adhesive sheet will be described as follows.
1. Production of adhesive sheet and its result
Manufacturing example
(2-ethylhexyl acrylate (EHA), 4-hydroxybutyl acrylate (4-HBA) as an organic solvent, methanol and a photoinitiator as an organic solvent The first resin and the second resin were prepared in the amounts described in [1]. At this time, the weight average molecular weights of the first resin and the second resin are as shown in [Table 1].
[Table 1]
The mixing monomer constituting the first resin and the second resin is described as the weight percentage of each monomer with respect to 100 weight% of the mixed monomer as a whole, and the content of the organic solvent and the photoinitiator is 100 weight% By weight.
Examples 1 to 2
The first resin and the second resin were mixed with each other in the amounts shown in Table 2 below and then coated on the base film. A UV lamp was applied to the coated portion for 10 minutes to prepare a pressure-sensitive adhesive sheet having a thickness of 100 탆.
Comparative Examples 1 to 2
A composition comprising the first resin or the second resin in the content shown in [Table 2] was applied on the base film. A UV lamp was applied to the coated portion for 10 minutes to prepare a pressure-sensitive adhesive sheet having a thickness of 100 탆.
[Table 2]
Level difference absorbency: The level difference absorbency (%) according to the following [Equation 1] was measured.
[Formula 1]
Level difference absorbency (%) = (total thickness of absorbable maximum level difference / adhesive sheet)? 100
Measurement of tack energy: The adhesive film prepared above was cut to a width of 1 inch and a length of 10 cm, and after 30 minutes, the adhesive strength was measured by a UTM (Universal Testing Machine).
Referring to the results of Table 1 and Table 2, the pressure-sensitive adhesive sheet formed by mixing the first resin and the second resin exhibits excellent step difference absorbency and adhesive property.
On the contrary, the pressure-sensitive adhesive sheet formed of the second resin exhibited excellent step difference absorbability but had a lower adhesive force than Examples 1 and 2. [ In addition, the pressure-sensitive adhesive sheet formed only from the first resin exhibited lower step absorbency and adhesion performance than Examples 1 and 2.
Therefore, the pressure-sensitive adhesive composition for a touch panel and the pressure-sensitive adhesive sheet of the present invention can be produced by mixing a first resin and a second resin having different weight average molecular weights, .
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.
Claims (9)
Wherein each of the first resin and the second resin is an acrylic copolymer resin polymerized from a mixed monomer containing (meth) acrylate having a cyclic structure, an organic solvent, and a photoinitiator.
Wherein the first resin comprises 5 to 50% by weight of (meth) acrylate having a cyclic structure with respect to 100% by weight of the mixed monomer.
Wherein the second resin comprises 50 to 90% by weight of (meth) acrylate having a cyclic structure with respect to 100% by weight of the mixed monomer.
Wherein the content of the second resin is 5 to 20 parts by weight based on 100 parts by weight of the first resin.
The (meth) acrylate having a cyclic structure may be selected from the group consisting of 2-phenoxyethyl (meth) acrylate, ethoxylate phenoxy (meth) acrylate, 3,3,5- trimethylcyclohexane Wherein the pressure-sensitive adhesive composition comprises at least one member selected from the group consisting of trimethylolpropane trimethylolpropane trimethylolpropane trimethylolpropane (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate and cyclohexyl (meth) acrylate.
Wherein the photoinitiator comprises at least one of a benzoin compound, a hydroxy ketone compound, an amino ketone compound, and a phosphine oxide compound.
The first resin and the second resin may be a mixed monomer containing a (meth) acrylate having a cyclic structure, an acrylic copolymer resin polymerized from an organic solvent and a photoinitiator
. ≪ / RTI >
And a stepwise water absorbency of 10 to 30%.
Wherein the thickness of the pressure-sensitive adhesive sheet is 50 to 200 占 퐉.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020160005908A KR102049595B1 (en) | 2016-01-18 | 2016-01-18 | Adhesive composition for touch panel and adhesive film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160005908A KR102049595B1 (en) | 2016-01-18 | 2016-01-18 | Adhesive composition for touch panel and adhesive film |
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| KR20170086741A true KR20170086741A (en) | 2017-07-27 |
| KR102049595B1 KR102049595B1 (en) | 2019-11-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190080197A (en) | 2017-12-28 | 2019-07-08 | 동우 화인켐 주식회사 | Adhesive composition, adhesive sheet, optical member and image display device produced using the same |
| KR20190102506A (en) | 2018-02-26 | 2019-09-04 | 동우 화인켐 주식회사 | Adhesive composition, adhesive sheet, optical member and image display device produced using the same |
| KR20190102505A (en) | 2018-02-26 | 2019-09-04 | 동우 화인켐 주식회사 | Adhesive composition, adhesive sheet, optical member and image display device produced using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20120122941A (en) * | 2011-04-28 | 2012-11-07 | 닛토덴코 가부시키가이샤 | Optical pressure-sensitive adhesive sheet |
| JP2012214546A (en) * | 2011-03-31 | 2012-11-08 | Lintec Corp | Pressure-sensitive adhesive and pressure-sensitive adhesive sheet |
| JP2013209487A (en) * | 2012-03-30 | 2013-10-10 | Emulsion Technology Co Ltd | Photo-curable self-adhesive composition and self-adhesive sheet using the same |
| KR20150100036A (en) * | 2014-02-24 | 2015-09-02 | 도레이첨단소재 주식회사 | Adhesive composition for touch screen panel and adhesive film using the same |
-
2016
- 2016-01-18 KR KR1020160005908A patent/KR102049595B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012214546A (en) * | 2011-03-31 | 2012-11-08 | Lintec Corp | Pressure-sensitive adhesive and pressure-sensitive adhesive sheet |
| KR20120122941A (en) * | 2011-04-28 | 2012-11-07 | 닛토덴코 가부시키가이샤 | Optical pressure-sensitive adhesive sheet |
| JP2013209487A (en) * | 2012-03-30 | 2013-10-10 | Emulsion Technology Co Ltd | Photo-curable self-adhesive composition and self-adhesive sheet using the same |
| KR20150100036A (en) * | 2014-02-24 | 2015-09-02 | 도레이첨단소재 주식회사 | Adhesive composition for touch screen panel and adhesive film using the same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190080197A (en) | 2017-12-28 | 2019-07-08 | 동우 화인켐 주식회사 | Adhesive composition, adhesive sheet, optical member and image display device produced using the same |
| KR20190102506A (en) | 2018-02-26 | 2019-09-04 | 동우 화인켐 주식회사 | Adhesive composition, adhesive sheet, optical member and image display device produced using the same |
| KR20190102505A (en) | 2018-02-26 | 2019-09-04 | 동우 화인켐 주식회사 | Adhesive composition, adhesive sheet, optical member and image display device produced using the same |
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| Publication number | Publication date |
|---|---|
| KR102049595B1 (en) | 2019-11-28 |
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