KR20170064113A - Adhesive composition, optically clear adhesive film and touch screen panel - Google Patents
Adhesive composition, optically clear adhesive film and touch screen panel Download PDFInfo
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- KR20170064113A KR20170064113A KR1020150169104A KR20150169104A KR20170064113A KR 20170064113 A KR20170064113 A KR 20170064113A KR 1020150169104 A KR1020150169104 A KR 1020150169104A KR 20150169104 A KR20150169104 A KR 20150169104A KR 20170064113 A KR20170064113 A KR 20170064113A
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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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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- 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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- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
Sensitive adhesive composition for optical use, an optical adhesive film, and a touch screen panel which are easily reworkable and have excellent high-temperature and high-humidity reliability.
The optical pressure-sensitive adhesive composition according to the present invention comprises 30 to 70% by weight of a C1-C16 alkyl acrylate or vinyl; 5 to 40% by weight of C1-C20 acrylate or vinyl; And 5 to 30% by weight of an alkyl acrylate having a hydroxyl group or a carboxyl group, wherein the C1-C20 acrylate or vinyl has a functional group selected from the group consisting of a carboxyl group, a carboxylic acid ester group and an ester group.
Description
The present invention relates to a pressure-sensitive adhesive composition for optical use, an optical adhesive film, and a touch screen panel, and more particularly, to a pressure-sensitive adhesive composition for optical use having an excellent reworkability and excellent reliability at high temperature and high humidity, 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 recent years, such an electronic device is intended to secure thin and light characteristics and long-term durability. An electronic apparatus including a touch screen or a touch panel switch on an input operation section includes a transparent conductive film having a conductive metal oxide layer on one side of a transparent film such as a polyethylene terephthalate film, A glass, a reinforcing material or a deco film. Since the pressure-sensitive adhesive or the like used in such electronic devices functions as a medium of each layer, it is important to ensure reliability that does not cause bubbles and whitish phenomenon, have excellent optical characteristics, and ensure long-term durability.
A related prior art is Korean Patent Laid-Open Publication No. 10-2013-0070571 (published on June 27, 2013), which discloses an acrylic pressure sensitive adhesive composition for optical use and an acrylic pressure sensitive adhesive tape for optical use.
An object of the present invention is to provide an optical pressure-sensitive adhesive composition for optical use, an adhesive film for optical use, and a touch screen panel which are easily reworkable and have excellent high-temperature and high-humidity reliability.
To achieve the above object, the present invention provides a pressure-sensitive adhesive composition for optical use comprising 30 to 70% by weight of a C1-C16 alkyl acrylate or vinyl; 5 to 40% by weight of C1-C20 acrylate or vinyl; And 5 to 30% by weight of an alkyl acrylate having a hydroxyl group or a carboxyl group, wherein the C1-C20 acrylate or vinyl has a functional group selected from the group consisting of a carboxyl group, a carboxylic acid ester group and an ester group.
In order to achieve the above object, an optical adhesive film according to an embodiment of the present invention includes a pressure sensitive adhesive layer formed using an optical adhesive composition.
According to an aspect of the present invention, there is provided a touch screen panel comprising: a conductive plastic film layer having a conductive layer formed on one surface thereof; A transparent adhesive layer formed by laminating an optical adhesive film on the conductive layer; And a cover window layer laminated on the optical adhesive film.
The optical pressure-sensitive adhesive composition for optical use, optical pressure-sensitive adhesive film and touch screen panel may be applied to a touch screen panel by lowering the adhesive strength of an optical pressure-sensitive adhesive film produced using an optical pressure-sensitive adhesive composition to have an adhesive strength of a certain level or less Since the adhesive film can be easily removed in the event of failure, re-workability can be facilitated, and it has low adhesive strength, but has excellent reliability that does not cause bubbles and cloudiness in a high temperature and high humidity atmosphere.
Therefore, the adhesive composition for optical use, optical adhesive film and touch screen panel according to the present invention has an adhesive strength at 25 ° C of 0.5 to 1.5 Kg / in and an adhesive strength at 80 ° C of not more than 35% .
1 is a cross-sectional view schematically illustrating a touch screen panel according to an embodiment of the present invention.
Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described hereinafter. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose 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.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The pressure-sensitive adhesive composition for optical use according to an embodiment of the present invention may include an alkyl acrylate having a hydroxyl group or a carboxyl group, 5 to 30% by weight.
At this time, the C1-C20 acrylate or vinyl has a functional group of any one of a carboxyl group, a carboxylic acid ester group and an ester group.
The optical pressure-sensitive adhesive composition for optical use according to an embodiment of the present invention is used as a bonding medium for bonding a conductive plastic film layer having a conductive layer formed on one side thereof and a cover window layer when a touch screen panel of a display device such as a mobile device, a tablet PC,
In particular, the pressure-sensitive adhesive composition for optical use according to the present invention has a low adhesive force and a high cohesive force to ensure excellent reworkability, maintains the adhesive force at high temperature to 35% or less of the adhesive force at low temperature, It is possible to secure excellent reliability in which bubbles and cloudiness are not generated at high temperature and high humidity.
The kind and content of the C1-C16 alkyl acrylate or vinyl may be adjusted to have a proper cohesive strength, a glass transition temperature, and an adhesive property of the copolymer. For this purpose, the C1-C16 alkyl acrylate or vinyl is preferably added at a content ratio of 30 to 70% by weight of the total weight of the pressure sensitive adhesive composition for optical use.
Examples of the C1-C16 alkyl acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (meth) acrylate, 2-ethylbutyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl Acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate and cetyl have.
The C1-C20 acrylate or vinyl is added for the purpose of lowering the adhesive force by increasing the cohesive force of the optical pressure-sensitive adhesive composition. In particular, it is more preferable that the C1-C20 acrylate or vinyl has a functional group of any one of a carboxyl group, a carboxylic acid ester group and an ester group.
As described above, since the C1-C20 acrylate or vinyl has a functional group selected from the group consisting of a carboxyl group, a carboxylic acid ester group and an ester group, the cohesive force is increased and the adhesive strength is lowered.
The C1-C20 acrylate or vinyl having a functional group of any one of a carboxyl group, a carboxylic acid ester group and an ester group is preferably added in a content ratio of 5 to 40% by weight based on the total weight of the pressure sensitive adhesive composition for optical use. If the amount of the C1-C20 acrylate or vinyl is less than 5% by weight, the adhesion at high temperature may not be significantly reduced, which may cause difficulty in rework. On the contrary, when the amount of the C1-C20 acrylate or vinyl is more than 40% by weight, the peeling force after irradiation with ultraviolet rays is reduced too much, and the adhesive strength may be greatly reduced.
Examples of the C1-C20 acrylate include 2-ethylhexyl (meth) acrylate, ethyl (meth) acrylate, methyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (Meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, isobornyl (Meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, Acrylate, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, isostearyl acrylate and 2-methylbutyl Or more can be used.
The alkyl acrylate having a hydroxyl group or a carboxyl group is added for the purpose of improving adhesion by hydrogen bonding and imparting cohesive force and suppressing the occurrence of the whitening phenomenon. The alkyl acrylate having a hydroxyl group or a carboxyl group is preferably added at a content ratio of 5 to 30% by weight based on the total weight of the pressure sensitive adhesive composition for optical use. When the addition amount of the alkacrylate having a hydroxyl group or a carboxyl group is less than 5% by weight, it may be difficult to exhibit the above effect properly. On the other hand, when the addition amount of the alkacrylate having a hydroxyl group or a carboxyl group is more than 30% by weight, the hydroxyl group or the carboxyl group in the copolymer becomes excessive and the crosslinking point becomes excessive, so that the flexibility is lowered and the physical properties such as durability and transmittance are lowered It can cause problems.
Examples of the alkyl acrylate having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (Meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate and 2-hydroxypropylene glycol (meth) acrylate may be used.
Examples of the alkyl acrylate having a carboxyl group include (meth) acrylic acid, maleic acid, maleic anhydride, fumaric acid, fumaric anhydride, crotonic acid, itaconic acid, itaconic anhydride, myristoleic acid, palmitoleic acid acid and oleic acid may be used.
In addition, the optical adhesive composition for an optical device according to an embodiment of the present invention may further include at least one or more of a crosslinking agent and a photoinitiator.
At this time, the crosslinking agent is added for the purpose of crosslinking the acrylic copolymer. For example, at least one selected from an isocyanate compound, an aziridine compound, an epoxy compound, a metal chelate compound and a polyfunctional acrylate may be used. For the purpose of inhibiting corrosion, it is also possible to employ an isocyanate compound as a crosslinking agent and use an ethylenically unsaturated monomer having a hydroxyl group as a polar monomer.
Such a crosslinking agent may be used in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the acrylic copolymer.
The type of the photoinitiator is not particularly limited as long as it can generate a radical by light irradiation to initiate a polymerization reaction. Specifically, the photoinitiator may use a photoinitiator that initiates a photo-curing reaction with light having an absorption wavelength of about 295 nm to about 420 nm. It is also preferred to exhibit a high water uptake at about 360 to about 380 nm, depending on the amount used.
Such photoinitiator may be used in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the copolymer. At this time, as the photoinitiator, any one selected from a benzoin-based initiator, a hydroxyketone-based initiator, an amino ketone-based initiator and caprolactam may be used.
Also, the pressure-sensitive adhesive composition for optical use according to an embodiment of the present invention may contain additives such as ultraviolet stabilizer, antioxidant, colorant, reinforcing agent, filler, defoamer, surfactant, plasticizer and combinations thereof Based on the total weight of the composition.
On the other hand, the optical pressure-sensitive adhesive film according to the embodiment of the present invention can be produced by applying the optical pressure-sensitive adhesive composition described above onto a base layer and then photo-curing the layer by light irradiation. Here, light irradiation means irradiation of electromagnetic wave that can cause polymerization reaction by affecting a photoinitiator or a polymerizable compound. In the above, electromagnetic waves include microwave, infrared ray, ultraviolet ray, X-ray and? A particle beam such as a proton beam, a neutron beam, and an electron beam is generally used.
At this time, there is no particular limitation on the method for producing an optical adhesive film by photocuring the optical pressure-sensitive adhesive composition. For example, an optical pressure-sensitive adhesive film can be produced by applying the above-described pressure-sensitive adhesive composition for optical or coating solution prepared by adding a solvent thereto to a suitable process substrate by a known means such as a bar coater and curing .
In the curing process, the crosslinking density, the molecular weight, the modulus of elasticity, etc. of the cured product are appropriately given after sufficiently removing the air bubble-inducing component such as volatile components or reaction residues contained in the optical pressure-sensitive adhesive composition or coating solution, It is possible to prevent the problem that the bubbles existing in the inner space become large and the scattering body is formed inside.
The method for curing the pressure-sensitive adhesive composition for optical use or the coating solution thereof is not particularly limited. For example, a process for irradiating ultraviolet rays or aging the coating layer formed by the pressure-sensitive adhesive composition for optical or its coating solution under predetermined conditions The curing process can be performed.
At this time, the photo-curing can be performed, for example, by UV irradiation. The UV irradiation carried out for photocuring can be carried out for about 10 seconds to about 15 seconds with a commonly used metal halide lamp.
In this case, UV irradiation is the amount of light, and preferably at 0.5J / cm 2 ~ 5.0J / cm 2 are preferred, and more preferably it is possible to present a 1.0 J / cm 2 ~ 3.0 J / cm 2.
The aforementioned optical adhesive film may have a thickness of approximately 5 to 300 탆, specifically 100 to 200 탆. An optical adhesive film having a thickness within the above range can be applied to a thin touch panel or a touch screen, and an adhesive film having excellent durability can be realized.
In particular, in the case of the optical adhesive film according to the embodiment of the present invention, it is preferable that the adhesive force at 25 ° C is 0.5 to 1.5 Kg / in and the adhesive force at 80 ° C has 35% or less of the adhesive force at 25 ° C . As a result, the optical adhesive film according to the embodiment of the present invention has a low adhesive force at a high temperature of 80 캜 and a low temperature adhesive force of less than 35% at 25 캜, so that the optical adhesive film is applied to a touch screen panel, The adhesive force can be drastically reduced upon reheating to a high temperature of about 70 ° C or higher, so that it is easy to easily remove the optical adhesive film, and the reworkability can be improved.
Further, in the case of the optical adhesive film according to the embodiment of the present invention, the storage elastic modulus 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 (TA Instrument). The larger the storage elastic modulus means the greater the elasticity of the pressure-sensitive adhesive layer, the higher the storage elastic modulus, the higher the cohesive force, so the adhesive force can be lowered relatively and the suppression characteristic against external pressure can be exerted.
Specifically, the pressure-sensitive adhesive layer maintains a storage modulus of 0.03 to 0.1 MPa at 25 캜 and 80 캜, respectively, thereby securing an excellent level difference absorbency while minimizing deformation due to external stimuli. At this time, the storage elastic modulus tends to decrease as the temperature increases, and thus the peel strength tends to decrease. When the storage elastic modulus is less than 0.03 MPa, pressing phenomenon and stamp phenomenon may easily occur. On the other hand, when the storage elastic modulus exceeds 0.1 MPa, the flexibility of the pressure-sensitive adhesive layer is very low, so that it is not attached to the substrate as a whole in the process of sticking, and lifting phenomenon occurs and the step difference absorbability may be lowered.
1 is a schematic cross-sectional view of a touch screen panel according to an embodiment of the present invention.
Referring to FIG. 1, a
The transparent pressure-sensitive adhesive layer (110) is a layer formed by photo-curing the pressure-sensitive adhesive composition, and the optical pressure-sensitive adhesive film has been described in detail above.
The specific kind of the conductive plastic film layer 130 is not particularly limited and a known conductive film in this field can be used. For example, the conductive film 130 may be a transparent plastic film having an ITO electrode layer as a conductive layer 132 on one side. Specifically, as the transparent plastic film forming the
Example
Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.
The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.
1. Adhesive film production
Example 1
50 parts by weight of 2-ethylbutyl acrylate, 35 parts by weight of isononyl acrylate having a carboxylic acid ester group and 15 parts by weight of 2-hydroxyethyl acrylate were thermally polymerized to obtain an acrylic copolymer. Next, 0.2 part by weight of Irgacure 651 as a photoinitiator and 0.5 part by weight of 1,6-hexanediol diacrylate (HDDA) as a crosslinking agent were mixed with 100 parts by weight of the acrylic copolymer to obtain a pressure-sensitive adhesive composition. Next, the pressure-sensitive adhesive composition was coated on PET by bar coating to a thickness of 150 탆 and cured by UV irradiation for 5 minutes to produce an adhesive film.
Example 2
Except that 40 wt% of 2-ethylbutyl acrylate, 35 wt% of isononyl acrylate having a carboxylic acid ester group and 25 wt% of 2-hydroxyethyl acrylate were thermally polymerized to obtain an acrylic copolymer. 1, a pressure-sensitive adhesive film was prepared.
Example 3
A pressure-sensitive adhesive film was prepared in the same manner as in Example 1 except that 60% by weight of isopropyl acrylate, 30% by weight of dodecylmethacrylate having an ester group and 10% by weight of acrylic acid were thermally polymerized to obtain an acrylic copolymer.
Example 4
A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that 50% by weight of isopropyl acrylate, 35% by weight of dodecylmethacrylate having an ester group and 15% by weight of acrylic acid were thermally polymerized to obtain an acrylic copolymer.
Comparative Example 1
Except that 60% by weight of 2-ethylbutyl acrylate, 3% by weight of isononyl acrylate having a carboxylic acid ester group and 37% by weight of 2-hydroxyethyl acrylate were thermally polymerized to obtain an acrylic copolymer. 1, a pressure-sensitive adhesive film was prepared.
Comparative Example 2
An adhesive film was prepared in the same manner as in Example 1, except that 40% by weight of isopropyl acrylate, 25% by weight of dodecylmethacrylate having an ester group and 35% by weight of acrylic acid were thermally polymerized to obtain an acrylic copolymer.
2. Property evaluation
Table 1 shows the adhesive force and the reliability evaluation results for the adhesive films prepared according to Examples 1 to 4 and Comparative Examples 1 and 2.
1) Adhesion
After the adhesive film was cut to a width of 25 mm and a length of 40 mm, the cut adhesive film was mounted on the glass by reciprocating once with a 2 kg roller once, And the adhesive force at the time of pulling off at 300 mm / min was measured.
2) Measurement of cloudiness and bubble generation phenomenon
The adhesive film adhered to the glass at 85 ° C and 85% RH was stored for 200 hours to visually observe whether white spots or bubbles were generated.
[Table 1]
Referring to Table 1, in the case of the adhesive films prepared according to Examples 1 to 4, the adhesive strength measured at 25 ° C is 0.6 to 0.66 Kg / in, and the adhesive strength measured at 80 ° C is the adhesive strength measured at 25 ° C. And 35% or less.
On the other hand, in the case of the adhesive film prepared according to Comparative Example 1, the adhesive strength measured at 25 ° C was 0.79 Kg / in and satisfied the target value, but the adhesive strength measured at 80 ° C was 35% ≪ / RTI >
Further, in the case of the pressure-sensitive adhesive film prepared according to Comparative Example 2, the adhesive force measured at 25 ° C was measured to be 1.67 kg / in and deviated from the target value. In the case of the adhesive force measured at 80 ° C, Which is more than 35%.
On the other hand, in the case of the pressure-sensitive adhesive films prepared according to Examples 1 to 4, no clouding phenomenon occurred and bubbles were not generated as a result of the reliability test of high temperature and high humidity.
On the other hand, in the case of the pressure-sensitive adhesive film prepared in accordance with Comparative Example 1, it was visually confirmed that the adhered surface was lifted due to the formation of bubbles.
Table 2 shows the evaluation of the storage modulus and the measurement of the transmittance of the pressure-sensitive adhesive films according to Examples 1 to 4 and Comparative Examples 1 and 2.
3) Storage elasticity
A 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 (TA Indtrument) at 25 캜.
4) Transmittance
After the adhesive film was cut into a size of 3 x 3 cm, the transmittance was measured using a haze meter.
[Table 2]
As shown in Table 2, the pressure-sensitive adhesive films according to Examples 1 to 4 satisfied the storage modulus values measured at 25 and 80 ° C of 0.03 to 0.1 MPa, respectively, and had a transmittance of 90.5% or more .
On the other hand, the adhesive film according to Comparative Example 1 had a storage modulus as low as 0.02 MPa at 80 ° C, whereas the adhesive film according to Comparative Example 2 had a storage modulus as measured at 25 ° C of 0.11 MPa And the transmittance was only 89.3% and 90.2%, respectively.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. These changes and modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.
100: Touch screen panel
110: Adhesive film
130: Conductive plastic film
131: plastic substrate layer
132: conductive layer
150: Cover window layer
160: transparent substrate
170: Liquid crystal display (LCD)
Claims (12)
5 to 40% by weight of C1-C20 acrylate or vinyl; And
5 to 30% by weight of an alkyl acrylate having a hydroxyl group or a carboxyl group,
Wherein the C1-C20 acrylate or vinyl has at least one functional group selected from the group consisting of a carboxyl group, a carboxylic acid ester group and an ester group.
The C1-C16 alkyl acrylate
N-butyl (meth) acrylate, t-butyl (meth) acrylate, sec (meth) acrylate, Acrylates such as butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylbutyl (Meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate and cetyl (meth) acrylate.
The C1-C20 acrylate
(Meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, pentyl (meth) acrylate, n- (Meth) acrylate, isobutyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, n-butyl (Meth) acrylate, isoamyl (meth) acrylate, isoamyl (meth) acrylate, n-decyl (Meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, isostearyl acrylate and 2-methylbutyl Pressure sensitive adhesive composition water.
The alkyl acrylate having a hydroxy group
Acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (Meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate and 2-hydroxypropylene glycol (meth) acrylate.
The alkyl acrylate having a carboxyl group
At least one of (meth) acrylic acid, maleic acid, maleic anhydride, fumaric acid, fumaric anhydride, crotonic acid, itaconic acid, itaconic anhydride, myristoleic acid, palmitoleic acid and oleic acid Sensitive adhesive composition.
The pressure-
A crosslinking agent, and a photoinitiator. ≪ RTI ID = 0.0 > 11. < / RTI >
The photoinitiator
A benzoin-based initiator, a hydroxyketone-based initiator, an amino ketone-based initiator, and an initiator caprolactam.
The pressure-
The adhesive force at 25 DEG C is 0.5 to 1.5 kg / in,
Wherein the adhesive force at 80 占 폚 has 35% or less of the adhesive force at 25 占 폚.
The pressure-
And a storage modulus at 25 占 폚 and 80 占 폚, respectively, of 0.03 to 0.1 MPa.
A transparent adhesive layer formed by laminating the optical adhesive film of claim 8 on the conductive layer; And
A cover window layer laminated on the optical adhesive film;
The touch screen panel comprising:
The cover window layer
A touch screen panel characterized by being a transparent glass replacement plastic film or tempered glass.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110068888A (en) * | 2009-12-14 | 2011-06-22 | 제일모직주식회사 | Adhesive composition and optical member using the same |
| KR20140085259A (en) * | 2012-12-27 | 2014-07-07 | 제일모직주식회사 | Adhesive film, adhesive composition for the same and display member comprising the same |
| KR20150026841A (en) * | 2013-08-30 | 2015-03-11 | 닛토덴코 가부시키가이샤 | Carrier film for transparent conductive film and laminate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110068888A (en) * | 2009-12-14 | 2011-06-22 | 제일모직주식회사 | Adhesive composition and optical member using the same |
| KR20140085259A (en) * | 2012-12-27 | 2014-07-07 | 제일모직주식회사 | Adhesive film, adhesive composition for the same and display member comprising the same |
| KR20150026841A (en) * | 2013-08-30 | 2015-03-11 | 닛토덴코 가부시키가이샤 | Carrier film for transparent conductive film and laminate |
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