KR101745042B1 - Adhesive composition for touch panel, adhesive film and touch panel - Google Patents

Abstract

There is provided a pressure-sensitive adhesive composition for a touch panel comprising a urethane oligomer having a glass transition temperature of about -50 to about -60 캜 and a weight average molecular weight of about 40,000 to about 60,000.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure-sensitive adhesive composition for a touch panel, an adhesive film and a touch panel,

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.

The pressure-sensitive adhesive used for attaching the transparent conductive film on the touch screen or the touch panel includes a step-difference absorbing property capable of absorbing a printed step by a decolour film; When exposed to harsh conditions such as high temperature or high humidity conditions, various physical properties such as durability capable of suppressing occurrence of curl or bubbles are required.

One embodiment of the present invention provides a pressure-sensitive adhesive composition for a touch panel having excellent step absorption ability, high-temperature reliability, and durability.

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 a pressure-sensitive adhesive composition for a touch panel, wherein the composition comprises a urethane oligomer having a glass transition temperature of about -50 to about -60 캜 and a weight average molecular weight of about 40,000 to about 60,000.

The pressure sensitive adhesive composition for a touch panel may comprise about 100 parts by weight of a (meth) acrylic acid ester monomer, about 10 to about 50 parts by weight of the urethane oligomer, and about 10 to about 50 parts by weight of the functional monomer.

The alkyl (meth) acrylate monomer may be alkyl (meth) acrylate, and the alkyl (meth) acrylate alkyl may be linear or branched C1-C14 alkyl.

The (meth) acrylic acid ester monomer may be at least one monomer selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, Butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl Acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, isononyl (meth) acrylate, and combinations thereof.

The functional monomer may include one selected from the group consisting of a hydroxyl group-containing monomer, a carboxyl group-containing monomer or a nitrogen-containing monomer, and combinations thereof.

The functional monomer may be selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (Meth) acrylate, 2-hydroxypropylene glycol (meth) acrylate, acrylic acid, methacrylic acid, 2- (meth) acryloyloxyacetic acid, (Meth) acryloyloxypropyltrimethoxysilane, 3- (meth) acryloyloxypropyl acid, 4- (meth) acryloyloxybutyl acid, acrylic acid dimer, itaconic acid, maleic acid, 2- (Meth) acrylate, N-vinylpyrrolidone, N-vinylcaprolactam, and combinations thereof, selected from the group consisting of cyanate propyl (meth) acrylate, 4-isocyanatobutyl One can be included.

The pressure sensitive adhesive composition for a touch panel may further include a photoinitiator.

The photoinitiator may include one selected from the group consisting of a benzoin-based initiator, a hydroxyketone-based initiator, an aminoketone-based initiator caprolactam, and combinations thereof.

The storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel may be about 1 x 10 ⁴ to about 7 x 10 ⁴ Pa at about 60 to about 80 캜.

The storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel may be about 3 x 10 ⁴ to about 2 x 10 ⁵ Pa at about 20 to about 30 ° C.

In another embodiment of the present invention, there is provided an adhesive film comprising a pressure-sensitive adhesive layer comprising a cured product of the pressure-sensitive adhesive composition for a touch panel.

The storage modulus of the pressure-sensitive adhesive layer may be about 1 x 10 ⁴ to about 7 x 10 ⁴ Pa at about 60 to about 80 ° C.

The storage modulus of the pressure-sensitive adhesive layer may be about 3 x 10 ⁴ to about 2 x 10 ⁵ Pa at about 20 to about 30 ° C.

The thickness of the pressure-sensitive adhesive layer may be about 50 탆 to about 300 탆.

The adhesive film may include a base layer and a pressure-sensitive adhesive layer laminated on one side or both sides of the base layer.

Wherein the base layer is at least one selected from the group consisting of polyethylene terephthalate, polytetrafluoroethylene, polyethylene, polypropylene, polybutene, polybutadiene, vinyl chloride copolymer, polyurethane, ethylene-vinyl acetate, ethylene- Ethylene-methyl acrylate copolymer, polyimide, and combinations thereof.

The adhesive film may be formed by sequentially laminating a pressure-sensitive adhesive layer and a release film layer on one side or both sides of the base layer.

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 attached 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 can provide an adhesive film excellent in step absorption ability, high-temperature reliability, and durability.

1 is a schematic cross-sectional view of an adhesive film according to an embodiment of the present invention.
2 is a schematic cross-sectional view of an adhesive film according to another embodiment of the present invention.
3 is a schematic cross-sectional view of a touch panel according to further embodiments of the present invention.
4 is a schematic cross-sectional view of a touch panel according to further 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.

The pressure-sensitive adhesive composition for a touch panel according to an embodiment of the present invention comprises a urethane oligomer having a weight average molecular weight of about 40,000 to about 60,000, and the glass transition temperature of the composition is about -50 to about -60 ° C.

Since the pressure-sensitive adhesive composition for a touch panel has excellent durability under high temperature and high humidity conditions, bubbles can be inhibited from being generated in the film even when applied as a film type to a touch panel structure in which outgassing is likely to occur.

The pressure-sensitive adhesive composition for a touch panel uses urethane having an oligomer-type molecular weight in order to have excellent durability under high temperature and high humidity conditions. Since this urethane oligomer reacts with itself, the curing reaction can be induced without a separate curing agent, and thus the pressure-sensitive adhesive composition for a touch panel may not contain a curing agent. Accordingly, the pressure-sensitive adhesive composition for a touch panel may have an improved storage modulus at a high temperature. The pressure-sensitive adhesive composition for a touch panel having an improved storage modulus at a high temperature has improved high-temperature reliability.

The storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel is about 1 x 10 ⁴ to about 7 x 10 ⁴ Pa at about 60 to about 80 캜. As described above, the storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel has the above range at a high temperature, and excellent durability can be provided under high temperature and high humidity conditions.

Also, the pressure-sensitive adhesive composition for a touch panel has a glass transition temperature of about -50 to about -60 ° C so as to have excellent durability under high temperature and high humidity conditions. The pressure sensitive adhesive composition for a touch panel may have a glass transition temperature within the above range to lower the storage modulus at low temperatures. The pressure-sensitive adhesive composition for a touch panel having a low storage modulus at low temperature can improve workability by improving the lamination performance between hard layers due to high elongation / high elasticity properties when applied as a film type to a touch panel, Can be improved.

The storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel may be about 3 × 10 ⁴ to about 2 × 10 ⁵ Pa at about 20 to about 30 ° C. The storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel has the above range at a low temperature, thereby realizing the above-mentioned effects.

The pressure sensitive adhesive composition for a touch panel may further comprise a (meth) acrylic acid ester monomer and a functional monomer. In one embodiment, the pressure sensitive adhesive composition for a touch panel may comprise about 10 to about 50 parts by weight of the urethane oligomer and about 10 to about 50 parts by weight of the functional monomer, relative to about 100 parts by weight of the (meth) acrylic acid ester monomer.

The pressure sensitive adhesive composition for a touch panel can improve the high-temperature reliability by using the urethane oligomer within the above-mentioned content range.

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 strength, glass transition temperature and adhesive property.

Specific examples of the (meth) acrylate monomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (Meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, n- (Meth) acrylate, isooctyl (meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, isononyl (meth) acrylate and combinations thereof.

The functional monomer means a monomer which simultaneously contains a copolymerizable functional group (for example, carbon-carbon double bond) and a functional group in the molecular structure.

The functional monomer may include, but is not limited to, one selected from the group consisting of, for example, a hydroxyl group-containing monomer, a carboxyl group-containing monomer or a nitrogen-containing monomer, and combinations thereof.

Specific examples of the functional monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl Acrylate, 2-hydroxyethyleneglycol (meth) acrylate, 2-hydroxypropyleneglycol (meth) acrylate and the like; (Meth) acryloyloxypropionic acid, 4- (meth) acryloyloxybutyric acid, acrylic acid dimer, itaconic acid, maleic acid And the like; (Meth) acrylate, 2-isocyanatoethyl (meth) acrylate, 3-isocyanatopropyl (meth) acrylate, Nitrogen-containing monomers such as N, N-vinylcaprolactam and the like; And a combination thereof.

The glass transition temperature of the pressure sensitive adhesive composition for a touch panel can be controlled by adjusting the content of each component.

The pressure-sensitive adhesive composition for a touch panel may further comprise a photoinitiator as a photo-curable composition for controlling the polymerization degree. The photoinitiator may be used in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the total amount of the monomers. The type of the photoinitiator is not particularly limited as long as it can generate radicals by light irradiation to initiate polymerization, For example, a benzoin-based initiator, a hydroxyketone-based initiator, an amino ketone initiator caprolactam, and combinations thereof.

The pressure-sensitive adhesive composition for a touch panel may contain an epoxy resin, a crosslinking agent, a UV stabilizer, an antioxidant, a coloring agent, a reinforcing agent, a filler, a defoaming agent, a surfactant, a plasticizer and a combination thereof in an amount not affecting the effect of the invention Based on the total weight of the composition.

In another embodiment of the present invention, there is provided an adhesive film comprising a pressure-sensitive adhesive layer comprising a cured product of the pressure-sensitive adhesive composition for a touch panel.

1 is a cross-sectional view of an adhesive film 10 including a pressure-sensitive adhesive layer 12 according to an embodiment of the present invention. 1, the adhesive film 10 includes a base layer 11 and a pressure-sensitive adhesive layer 12 formed on both sides of the base layer 11. As shown in Fig. However, in the adhesive film 10, the pressure-sensitive adhesive layer 12 may be formed on only one side of the base layer 11, and if necessary, only the sheet-like pressure-sensitive adhesive layer 12 may be included without the base layer.

The pressure-sensitive adhesive layer 12 may have a storage modulus of about 1 × 10 ⁴ to about 7 × 10 ⁴ Pa at about 60 to about 80 ° C. The storage modulus value of the pressure-sensitive adhesive layer 12 formed as a cured product of the pressure-sensitive adhesive composition for a touch panel may have the above range at a high temperature, and thus excellent durability can be imparted under high temperature and high humidity conditions as described above.

The pressure-sensitive adhesive layer 12 may have a storage modulus of about 3 × 10 ⁴ to about 2 × 10 ⁵ Pa at about 20 to about 30 ° C. The storage modulus value of the pressure-sensitive adhesive layer 12, which is formed as a cured product of the pressure-sensitive adhesive composition for a touch panel, may have the above range at a low temperature, thereby realizing the above effect.

The pressure-sensitive adhesive composition for a touch panel may be coated on the base layer 11 and photo-cured by light irradiation to form the pressure-sensitive adhesive layer 12 to produce the pressure-sensitive adhesive film 10. The term "light irradiation" means irradiation of an 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- A particle beam such as a proton beam, a neutron beam, and an electron beam is generally used.

The method for curing the pressure-sensitive adhesive composition for a touch panel to produce the pressure-sensitive adhesive layer 12 is not particularly limited. For example, the pressure-sensitive adhesive layer 12 may be prepared by applying the above-described composition for a touch panel or a coating solution prepared by adding a solvent thereto to a suitable process substrate by a known means such as a bar coater and curing .

The curing process may be carried out after sufficiently removing the bubble generating component such as volatile components or reaction residues contained in the pressure-sensitive adhesive composition or the coating solution to appropriately impart crosslinking density, molecular weight, and elastic modulus of the cured product, It is possible to prevent the problem that the bubbles existing at the adhesive interface become large and form a scattering body therein.

The method for curing the pressure-sensitive adhesive composition for a touch panel or the coating solution thereof is not particularly limited. For example, the pressure-sensitive adhesive composition for a touch panel or the coating layer formed by the coating solution may be irradiated with ultraviolet light, ), And the curing process can be performed.

The pressure-sensitive adhesive layer 12 may have a thickness of about 50 탆 to about 300 탆, specifically about 100 탆 to about 200 탆. The pressure-sensitive adhesive layer 12 having a thickness in the above-described range can be applied to a thin touch panel or a touch screen, and the pressure-sensitive adhesive film 10 having excellent durability can be realized.

The specific type of the base layer 11 is not particularly limited, and for example, a general plastic film in this field can be used. For example, the base layer 11 may be formed of a material such as polyethylene terephthalate, polytetrafluoroethylene, polyethylene, polypropylene, polybutene, polybutadiene, vinyl chloride copolymer, polyurethane, ethylene- , Ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, polyimide, and combinations thereof. Specifically, the base layer 11 may be a polyethylene terephthalate film, but is not limited thereto.

The thickness of the base layer 11 may be from about 25 microns to about 300 microns, specifically from about 30 microns to about 200 microns. It is possible to realize the adhesive film 10 which is applicable to a thin touch panel or a touch screen while having the thickness of the base layer 11 in the above-described range, and which is excellent in durability.

2 is a cross-sectional view of an adhesive film 20 according to another embodiment of the present invention.

The adhesive film 20 may further include a release film layer 23 formed on the pressure-sensitive adhesive layer 22, if necessary. 2, the adhesive film 20 includes a base layer 21; A pressure-sensitive adhesive layer (22) laminated on both sides of the base layer (21); And a release film layer (23) laminated on the pressure sensitive adhesive layer (22).

The release film layer 23 can be subjected to a suitable release treatment on one surface of various plastic films used for the base layers 11 and 21 described above to form the release film layer 23, for example. Examples of the releasing agent used in the mold releasing treatment include an alkyd type, a silicone type, a fluorine type, an unsaturated ester type, a polyolefin type, or a wax type releasing agent. Among them, an alkyd type, a silicone type or a fluorine type releasing agent is preferably used from the viewpoint of heat resistance However, it is not limited thereto.

The thickness of the release film layer 23 is not particularly limited and may be suitably selected in accordance with the intended application. For example, the thickness of the release film layer 23 may be from about 10 microns to about 100 microns, specifically from about 30 microns to about 90 microns, and more specifically from about 40 microns to about 80 microns.

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 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.

Figures 3 and 4 show schematic cross-sectional views of touch panels 100 and 200 according to further embodiments of the present invention.

3, the touch panel 100 includes a conductive plastic film 130 including a plastic substrate layer 131 and a conductive layer 132 formed on one side of the plastic substrate layer 131, The layer 112 may have a structure attached to one surface of the conductive layer 132 of the conductive plastic film 130.

A specific kind of the conductive plastic film 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 on one side thereof. Specifically, as the transparent plastic film forming the plastic substrate layer 131, a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a vinyl chloride air An ethylene-vinyl acetate film, an ethylene-propylene copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl acrylate copolymer film, or a polyimide film. More specifically, the plastic substrate layer 131 may be a polyethylene terephthalate (PET) film.

4, the touch panel 200 includes an anti-reflection coating 251, a cover window 250 including a protective film 252, an adhesive layer 210, A conductive plastic film 230 having a conductive layer 232 formed on one surface thereof, and a transparent substrate 260. In addition, the touch panel 200 including each layer as described above may be attached to a display device such as a liquid crystal display (LCD)

4, a pressure-sensitive adhesive layer 210 including a cured product of the pressure-sensitive adhesive composition for a touch panel may be adhered onto the conductive layer 232 of the conductive plastic film 230.

In the structure shown in Fig. 4, except for the pressure-sensitive adhesive layer 210 containing the cured product of the pressure-sensitive adhesive composition for a touch panel, the kind and the formation method of the other constituents are not particularly limited, .

Hereinafter, examples and comparative examples of the present invention will be described. The following embodiments are only examples of the present invention, and the present invention is not limited to the following embodiments.

( Example )

Manufacturing example  One

68 parts by weight of polypropylene glycol (PPG) having a molecular weight of 2000 and 22 parts by weight of isophorone diisocyanate were reacted at 80 DEG C, and 10 parts by weight of hydroxyethyl acrylate was reacted with an isocyanate polymer to prepare a urethane acrylate oligomer having a weight average molecular weight of 50,000 Respectively.

Manufacturing example  2

81 parts by weight of polypropylene glycol (PPG) having a molecular weight of 2000 and 10 parts by weight of isophorone diisocyanate were reacted at 80 DEG C, and 9 parts by weight of hydroxyethyl acrylate was reacted with an isocyanate polymer to prepare a urethane acrylate oligomer having a weight average molecular weight of 100,000 Respectively.

Manufacturing example  3

53 parts by weight of polypropylene glycol (PPG) having a molecular weight of 2000 and 27 parts by weight of isophorone diisocyanate were reacted at 80 DEG C, and 20 parts by weight of hydroxyethyl acrylate was reacted with an isocyanate polymer to prepare a urethane acrylate oligomer having a weight average molecular weight of 23,000 Respectively.

Example  One

15 parts by weight of the urethane oligomer synthesized in Preparation Example 1, 80 parts by weight of 2-EHA (ethylhexyl acrylate) and 20 parts by weight of HEA (hydroxyethyl acrylate) were mixed, and 1-hydroxy (1-hydroxy-cyclohexyl-phenyl-ketone) was prepared, and the glass transition temperature of the pressure-sensitive adhesive composition was measured to be -56 ° C. (measuring instrument: DSC 8000, PerkinElmer Inc.). ). The pressure-sensitive adhesive composition was coated on a polyethylene terephthalate film (thickness: 75 占 퐉) coated with a coating solution using a bar coater. Thereafter, an ultraviolet ray was irradiated for 10 minutes using a UV lamp to cure the adhesive film, thereby obtaining a pressure-sensitive adhesive film having a thickness of 100 mu m after curing of the pressure-sensitive adhesive composition.

Example  2

An adhesive film was prepared in the same manner as in Example 1, except that 20 parts by weight of urethane oligomer was used.

Comparative Example  One

An adhesive film was prepared in the same manner as in Example 1, except that the urethane oligomer synthesized in Preparation Example 2 was used.

Comparative Example  2

An adhesive film was prepared in the same manner as in Example 2, except that the urethane oligomer synthesized in Preparation Example 2 was used. Example

Comparative Example  3

An adhesive film was prepared in the same manner as in Example 1, except that the urethane oligomer synthesized in Production Example 3 was used.

Comparative Example  4

An adhesive film was prepared in the same manner as in Example 2, except that the urethane oligomer synthesized in Production Example 3 was used.

The content ratios of the pressure-sensitive adhesive compositions of Examples 1-2 and 1-4 are summarized in Table 1 below

division EXAMPLES [parts by weight] Comparative Example [parts by weight] One 2 One 2 3 4 Urethane oligomer
(Weight average
Molecular Weight) 15
(50000) 20
(50000) 15
(100000) 20
(100000) 15
(23000) 20
(23000) 2-EHA 80 80 80 80 80 80 HEA 20 20 20 20 20 20

evaluation

The following properties of the pressure-sensitive adhesive films prepared in Examples 1-2 and 1-6 were measured and are shown in Table 2.

<Storage modulus measurement>

The elastic modulus was measured using ARES-G2 instrument of TA instrument. After cutting the adhesive film prepared in Example 1-2 and Comparative Example 1-6 with a diameter of 8 mm, adhesive was placed between parallel plates and the temperature range was set at 25 占 폚 and 75 占 폚 to obtain 10 % Strain to measure the storage modulus.

&Lt; Evaluation of step absorption ability &

After positioning and laminating the adhesive films prepared in Examples 1-2 and 1-6 between a glass substrate of 4 inch size printed with a bezel having a width of 10 mm and a thickness of 15 um and ITO PET, Deg.] C (5 [deg.] C, 5 bar) and visually observed to confirm the presence of bubbles.

&Lt; Evaluation of high temperature reliability &

The adhesive film prepared in Example 1-2 and Comparative Example 1-6 was placed between the polarizing plate and the ITO PET and laminated and stored for 3 days under high temperature and high humidity (85 degrees, 85% relative humidity) Bubbles were observed.

The measurement results are shown in Table 2 below.

Property classification EXAMPLES [parts by weight] Comparative Example [parts by weight] One 2 One 2 3 4 5 6 25 ℃
G '(Pa) 1x10 ⁵ 9x10 ⁴ 2x10 ⁴ 3x10 ⁴ 2.5x10 ⁵ 3.5x10 ⁵ 1 x 10 ⁴ 3x10 ⁵ 70 ℃
G '(Pa) 3x10 ⁴ 3.5x10 ⁴ 9x10 ³ 9.5x10 ³ 8x10 ⁴ 9x10 ⁴ 8x10 ³ 8x10 ⁴ High temperature reliability Pass Pass Fail Fail Pass Pass Fail Pass Step absorption ability Pass Pass Pass Pass Fail Fail Pass Fail

10, 20: adhesive film 11, 21: substrate layer
12, 22, 112, 210: pressure-sensitive adhesive layer 23: release film layer
100, 200: touch panel 130, 230: conductive plastic film
131, 231: plastic substrate layer 132, 232: conductive layer
251: Antireflection coating 252: Protective film
250: cover window 260: transparent substrate
270: Liquid crystal display (LCD)

Claims (19)

Wherein the glass transition temperature of the composition is from -50 to -60 캜,
(Meth) acrylic acid ester monomer, a functional monomer, and a urethane oligomer having a weight average molecular weight of 45,000 to 60,000,
The content of the urethane oligomer is 15 to 30 parts by weight based on 100 parts by weight of the (meth) acrylic acid ester monomer,
The content of the functional monomer is 10 to 50 parts by weight based on 100 parts by weight of the (meth) acrylate monomer,
Wherein the functional monomer comprises one selected from the group consisting of a hydroxy group-containing monomer, a carboxyl group-containing monomer or a nitrogen-containing monomer, and combinations thereof
Sensitive adhesive composition for a touch panel.
delete The method according to claim 1,
Wherein the (meth) acrylate monomer is an alkyl (meth) acrylate and the alkyl of the alkyl (meth) acrylate is a linear or branched C1-C14 alkyl
Sensitive adhesive composition for a touch panel.
The method according to claim 1,
The (meth) acrylic acid ester monomer may be at least one monomer selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, Butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, isononyl (meth) acrylate and combinations thereof.
Sensitive adhesive composition for a touch panel.
delete The method according to claim 1,
The functional monomer may be selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (Meth) acrylate, 2-hydroxypropylene glycol (meth) acrylate, acrylic acid, methacrylic acid, 2- (meth) acryloyloxyacetic acid, (Meth) acryloyloxypropyltrimethoxysilane, 3- (meth) acryloyloxypropyl acid, 4- (meth) acryloyloxybutyl acid, acrylic acid dimer, itaconic acid, maleic acid, 2- (Meth) acrylate, N-vinylpyrrolidone, N-vinylcaprolactam, and combinations thereof, selected from the group consisting of cyanate propyl (meth) acrylate, 4-isocyanatobutyl Containing one
Sensitive adhesive composition for a touch panel.
The method according to claim 1,
Further comprising a photoinitiator
Sensitive adhesive composition for a touch panel.
8. The method of claim 7,
Wherein the photoinitiator comprises one selected from the group consisting of a benzoin-based initiator, a hydroxyketone-based initiator, an aminoketone-based initiator caprolactam, and combinations thereof
Sensitive adhesive composition for a touch panel.
The method according to claim 1,
In the touch panel of the cured product of the pressure-sensitive adhesive composition for storage modulus of 60 to 80 ℃ of 1 × 10 ⁴ to 7 × 10 ⁴ Pa
Sensitive adhesive composition for a touch panel.
The method according to claim 1,
Wherein the storage modulus of the cured product of the pressure-sensitive adhesive composition for a touch panel is from 3 x 10 &lt; ⁴ &gt; to 2 x 10 &lt; ⁵ &gt; Pa
Sensitive adhesive composition for a touch panel.
A pressure-sensitive adhesive film comprising a pressure-sensitive adhesive layer comprising a cured product of the pressure-sensitive adhesive composition for a touch panel according to any one of claims 1, 3, 4 and 6 to 10.
12. The method of claim 11,
From 60 to 80 ℃ modyulreoseuyi storage of the pressure-sensitive adhesive layer is 1 × 10 ⁴ to 7 × 10 ⁴ Pa
Adhesive film.
12. The method of claim 11,
Wherein the pressure-sensitive adhesive layer has a storage modulus of 3 x 10 &lt; ⁴ &gt; to 2 x 10 &lt; ⁵ &gt; Pa
Adhesive film.
12. The method of claim 11,
When the thickness of the pressure-sensitive adhesive layer is 50 mu m to 300 mu m
Adhesive film.
12. The method of claim 11,
Wherein the adhesive film comprises a base layer and a pressure-sensitive adhesive layer laminated on one side or both sides of the base layer
Adhesive film.
16. The method of claim 15,
Wherein the base layer is at least one selected from the group consisting of polyethylene terephthalate, polytetrafluoroethylene, polyethylene, polypropylene, polybutene, polybutadiene, vinyl chloride copolymer, polyurethane, ethylene-vinyl acetate, ethylene- Ethylene-methyl acrylate copolymer, polyimide, and combinations thereof.
Adhesive film.
16. The method of claim 15,
A pressure-sensitive adhesive layer and a release film layer are sequentially laminated on one side or both sides of the base layer
Adhesive film.
A conductive plastic film having a conductive layer on one surface thereof; And
A pressure-sensitive adhesive layer attached to the conductive layer and comprising a cured product of the pressure-sensitive adhesive composition for a touch panel according to any one of claims 1, 3, 4 and 6 to 10
.
19. The method of claim 18,
Wherein the conductive plastic film is a polyethylene terephthalate film formed on one side of the ITO (conductive metal oxide) layer
Touch panel.

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