KR102021449B1 - Optically clear adhesive film for touch screen panel - Google Patents

Optically clear adhesive film for touch screen panel Download PDF

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Publication number
KR102021449B1
KR102021449B1 KR1020160001097A KR20160001097A KR102021449B1 KR 102021449 B1 KR102021449 B1 KR 102021449B1 KR 1020160001097 A KR1020160001097 A KR 1020160001097A KR 20160001097 A KR20160001097 A KR 20160001097A KR 102021449 B1 KR102021449 B1 KR 102021449B1
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South Korea
Prior art keywords
adhesive layer
sensitive adhesive
acrylate
weight
touch screen
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KR1020160001097A
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Korean (ko)
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KR20170082191A (en
Inventor
윤후영
장세현
윤찬오
김장순
서주용
김상환
최준만
김원호
이주현
노승주
김우연
서광수
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주식회사 엘지화학
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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
    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • 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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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • 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)

Abstract

Excellent printing step absorption, and after attaching to at least one of glass, ITO film and polarizing plate, and post-curing, even if left in a high temperature and high humidity atmosphere for a long time does not generate bubbles and turbidity, but also has a low dielectric constant Disclosed is an optical adhesive film for a touch screen panel capable of suppressing a defect due to noise by introducing an internal adhesive layer.
Optical adhesive film for a touch screen panel according to the present invention is an inner pressure-sensitive adhesive layer; And an outer pressure sensitive adhesive layer formed on the upper and lower surfaces of the inner pressure sensitive adhesive layer, respectively, wherein the relative dielectric constant (ε r ) measured at a frequency of 100 kHz is 3.5 or less.

Description

Optical adhesive film for touch screen panels {OPTICALLY CLEAR ADHESIVE FILM FOR TOUCH SCREEN PANEL}

The present invention relates to an optical adhesive film for a touch screen panel.

In recent years, electronic devices such as PDAs, mobile communication terminals, or vehicle navigation systems are forming a large market. In recent years, such an electronic device aims at securing thin and light characteristics and long-term durability. An electronic device including a touch screen or a touch panel switch in an input operation unit includes a transparent conductive film having a conductive metal oxide layer on one surface of a transparent film such as a polyethylene terephthalate film, and conducting the transparent conductive film through an adhesive or the like. It has a structure laminated | stacked on glass, a reinforcing material, or a decor film. Since an adhesive or the like used in such an electronic device functions as a medium for each layer, it is important to ensure reliability that bubbles and cloudiness do not occur, have excellent optical properties, and ensure long-term durability.

In addition, recently, as the thickness of smart devices becomes thinner, a problem of noise is frequently generated due to the proximity between the touch screen panel and the liquid crystal display.

Related prior art documents include Korean Unexamined Patent Publication No. 10-2012-0072163 (published Jul. 03, 2012), which discloses an optical adhesive composition for an OCA film.

An object of the present invention is excellent printing step absorption, and after being attached to at least one of glass, ITO film and polarizing film, and performing post-curing, even if left for a long time in an atmosphere of high temperature and high humidity, bubbles and turbidity does not occur. Rather, the present invention provides an optical adhesive film for a touch screen panel capable of suppressing defects caused by noise by introducing an internal adhesive layer having a low dielectric constant.

Optical adhesive film for a touch screen panel according to an embodiment of the present invention for achieving the above object is an inner pressure-sensitive adhesive layer; And an outer pressure sensitive adhesive layer formed on the upper and lower surfaces of the inner pressure sensitive adhesive layer, respectively, wherein the relative dielectric constant (ε r ) measured at a frequency of 100 kHz is 3.5 or less.

In the optical pressure-sensitive adhesive film for touch screen panels according to the present invention, since the relative dielectric constant (ε r ) measured at a frequency of 100 kHz by using a low dielectric material as the internal pressure-sensitive adhesive layer has a value of 3.5 or less, the distance between the touch screen panel and the liquid crystal display device is increased. Even if it approaches, the generation of noise can be suppressed.

In addition, the optical pressure-sensitive adhesive film for a touch screen panel according to the present invention is added to the external pressure-sensitive adhesive layer by adding the first and second photoinitiators, which are two kinds of photoinitiators reacting at different wavelength bands, thereby converting the optical pressure-sensitive adhesive film into glass, ITO film and polarizing film When attached to at least one of them, the semi-cured state can be maintained by exhibiting a semi-cured state, and after the optical adhesive film is attached to at least one of glass, ITO film, and polarizing film, it reacts at a wavelength range of 260 to 330 nm. By using the first photoinitiator to increase the degree of curing by post-curing the outer pressure-sensitive adhesive layer it is possible to improve the high temperature and high humidity reliability.

1 is a cross-sectional view showing an optical adhesive film for a touch screen panel according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, an optical adhesive film for a touch screen panel according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing an optical adhesive film for a touch screen panel according to an embodiment of the present invention.

Referring to FIG. 1, the optical pressure-sensitive adhesive film 100 for a touch screen panel according to an embodiment of the present invention has an external pressure-sensitive adhesive layer 140 formed on the upper and lower surfaces of the inner pressure-sensitive adhesive layer 120 and the inner pressure-sensitive adhesive layer 120, respectively. It has a three-layer structure comprising a.

The inner pressure-sensitive adhesive layer 120 is disposed in the middle of the optical pressure-sensitive adhesive film 100 to increase the handleability of the soft outer pressure-sensitive adhesive layer 140, and helps to overcome the printing step. To this end, the inner pressure-sensitive adhesive layer 120 is made of a fully curable pressure-sensitive adhesive has a certain strength or more. That is, in the case of the optical adhesive film 100, the degree of curing is low, there is a fear of deterioration of the cutting property and handling properties difficult Therefore, a hard inner pressure-sensitive adhesive layer 120 is inserted between the outer pressure-sensitive adhesive layers 140 as compared with the outer pressure-sensitive adhesive layer 140. As a result, deformation of the outer pressure sensitive adhesive layers 140 may be prevented by the hard inner pressure sensitive adhesive layer 120.

The internal pressure-sensitive adhesive layer 120 has a first thickness, the first thickness is preferably 50 ~ 200㎛. When the thickness of the inner pressure-sensitive adhesive layer 120 is less than 50㎛, it may be difficult to properly exhibit the above effects. On the contrary, when the thickness of the inner pressure-sensitive adhesive layer 120 exceeds 200 μm, the level difference absorbency is reduced, and bubbles are not shown, but there is a risk of clouding.

The outer pressure sensitive adhesive layer 140 is formed on the upper and lower surfaces of the inner pressure sensitive adhesive layer 120, respectively. At this time, the outer pressure-sensitive adhesive layer 140 is formed of a softer material than the inner pressure-sensitive adhesive layer 120 serves to absorb the printing step. Thus, in the present invention, by using a fully cured pressure-sensitive adhesive as the inner pressure-sensitive adhesive layer 120, and a semi-cured pressure-sensitive adhesive having a low degree of curing as the outer pressure-sensitive adhesive layer 140, by the inner pressure-sensitive adhesive layer 120 It is possible to ensure the ease of handling, but also by the outer pressure-sensitive adhesive layer 140 disposed on the outer side of the inner pressure-sensitive adhesive layer 120, it is possible to ensure excellent printing step absorption.

The outer pressure-sensitive adhesive layer 140 has a second thickness thinner than the first thickness, the second thickness is preferably 20 ~ 60㎛. When the thickness of the outer pressure-sensitive adhesive layer 140 is less than 20㎛, it may be difficult to completely absorb the printing step. On the contrary, when the thickness of the outer pressure-sensitive adhesive layer 140 exceeds 60㎛, it is difficult to receive the support of the inner pressure-sensitive adhesive layer 120, so that it may be difficult to overcome the printing step.

In general, the optical adhesive film 100 is disposed between the glass and the glass, wherein the soft outer pressure-sensitive adhesive layer disposed on the upper and lower portions of the inner pressure-sensitive adhesive layer 120, respectively, due to the structure of the hard inner pressure-sensitive adhesive layer 120 Since it slightly supports the intermediate portion 140, it may be more advantageous to overcome the printing step. When both the inner pressure-sensitive adhesive layer 120 and the outer pressure-sensitive adhesive layer 140 of the optical pressure-sensitive adhesive film 100 are made of a soft pressure-sensitive adhesive, difficulty in cutting and handling properties may occur, so that the inner pressure-sensitive adhesive layer 120 may be hard. It is preferable that it consists of one adhesive.

In this case, the inner pressure-sensitive adhesive layer 120 includes an acrylate compound, a photocuring agent, a photoinitiator and a silane coupling agent. More specifically, the inner pressure-sensitive adhesive layer 120 is composed of 0.1 to 0.5 parts by weight of the photocuring agent, 0.1 to 0.5 parts by weight of the photoinitiator and 0.1 to 0.3 parts by weight of the silane coupling agent based on 100 parts by weight of the acrylate compound.

The acrylate compound of the inner pressure-sensitive adhesive layer 120 controls the permittivity by controlling the amount of void generation by controlling the free volume in the matrix using a monomer having a high molecular weight. As a result, the optical adhesive film 100 for the touch screen panel according to the embodiment of the present invention has a relative dielectric constant ε r measured at a frequency of 100 kHz by adjusting the dielectric constant of the internal pressure-sensitive adhesive layer 120 having 3.5 or less. As a result, it is possible to secure a low dielectric constant.

To this end, the acrylate compound of the inner pressure-sensitive adhesive layer 120 is 2-ethylhexyl acrylate (2-EHA), hydroxyethyl acrylate (HEA), isobornyl acrylate (IBOA) and isostearyl acrylate ( Preferably at least one selected from ISTA).

That is, the inner pressure-sensitive adhesive layer 120 has a decrease in the content of hydroxyethyl acrylate (HEA) to increase the glass transition temperature Tg due to the decrease of the polar group, the side chain of isostaryl acrylate (ISTA) The longer free volume is increased to generate voids in the inner pressure-sensitive adhesive layer 120 to induce a decrease in dielectric constant.

At this time, it is preferable that the acrylate compound of the inner pressure-sensitive adhesive layer 120 uses an acrylate monomer having a weight average molecular weight of 100,000 to 1,500,000. When the weight average molecular weight of the acrylate monomer is less than 100,000, durability and high temperature and high humidity reliability are weak and bubbles may occur. On the contrary, when the weight average molecular weight of the acrylate monomer exceeds 1,500,000, there is a problem in that the fluidity is lowered and the adhesive physical property decreases.

Therefore, in the optical adhesive film 100 for the touch screen panel according to the embodiment of the present invention, by using a low dielectric material as the internal pressure-sensitive adhesive layer 120, the relative dielectric constant ε r measured at a frequency of 100 kHz is 3.5 or less. Therefore, even if the distance between the touch screen panel and the liquid crystal display device is close, it is possible to prevent the generation of noise.

As the photocuring agent, at least one selected from hexanediol diacrylate-based curing agent, urethane acrylate-based curing agent, epoxy-based curing agent and isocyanate-based curing agent may be used.

When the amount of the photocuring agent is less than 0.1 part by weight based on 100 parts by weight of the acrylate compound, the overall degree of curing of the optical adhesive film 100 may be lowered, which may cause problems in high temperature and high humidity reliability. On the contrary, when the amount of the photocuring agent exceeds 0.5 parts by weight based on 100 parts by weight of the acrylate compound, interfacial peeling with the external pressure-sensitive adhesive layer 140 may be caused.

The photoinitiator serves to induce curing between the double bonds upon irradiation with ultraviolet rays, thereby increasing the strength and lowering the adhesion. Such photoinitiators include 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydrate Hydroxy-cyclohexyl-phenyl-ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropaneone-1,2,4-diethylthioxanthone, 2-ethylanthraquinone and One or more selected from aromatic ketones of phenanthrenequinone may be used.

When the added amount of the photoinitiator is less than 0.1 part by weight with respect to 100 parts by weight of the acrylate compound, there is a problem of lowering high temperature and high humidity reliability. On the contrary, when the amount of the photoinitiator is added in an amount of more than 0.5 parts by weight based on 100 parts by weight of the acrylate compound, it may cause a change over time due to the excessive content of the photoinitiator.

The silane coupling agent acts as an adhesion promoter to promote adhesion. Such silane coupling agents include 2- (3,4 epoxy cyclohexyl) -ethyltrimethoxysilane, 3-glycidoxycitrimethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2 containing amine groups (Aminoethyl) 3-amitopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyl Trimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysil-N- (1,3-dimethylbutylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, mer One or more selected from capto-containing 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, isocyanate-containing 3-isocyanatepropyltriethoxysilane and the like can be used.

In this case, the silane coupling agent is preferably added in an amount of 0.1 to 0.3 parts by weight with respect to 100 parts by weight of the acrylate compound, which has a problem in that the adhesion reliability is lowered when the amount of the silane coupling agent is out of the above range. Because. In addition, when the amount of the silane coupling agent added exceeds 0.3 part by weight, it may cause change over time due to excessive addition of the silane coupling agent.

Meanwhile, the outer pressure-sensitive adhesive layer 140 includes an acrylate compound, a photocuring agent, a first photoinitiator, a second photoinitiator, and a silane coupling agent. More specifically, the outer pressure-sensitive adhesive layer 140 is based on 100 parts by weight of the acrylate compound, 0.01 to 2 parts by weight of the photocuring agent, 0.1 to 10 parts by weight of the first photoinitiator, 0.1 to 0.5 parts by weight of the second photoinitiator and the silane coupling agent The composition is 0.1 to 0.5 parts by weight.

The acrylate compound of the outer pressure-sensitive adhesive layer 140 is 2-ethylhexyl acrylate (2-EHA), ethylhexyl methyl acrylate (EHMA), isobornyl acrylate (IBoA), isostearyl acrylate (ISTA) Selected from acrylate monomers including 4-hydroxybutyl acrylate (4-HBA), hydroxyethyl acrylate (HEA), butyl acrylate, hexyl acrylate, n-octyl acrylate and isooctyl acrylate It may include more than one species.

As the photocuring agent, at least one selected from hexanediol diacrylate-based curing agent, urethane acrylate-based curing agent, epoxy-based curing agent and isocyanate-based curing agent may be used.

When the amount of the photocuring agent added is less than 0.01 part by weight based on 100 parts by weight of the acrylate compound, the overall curing degree of the optical adhesive film 100 may be lowered, which may cause problems in high temperature and high humidity reliability. On the contrary, when the amount of the photocuring agent exceeds 2 parts by weight based on 100 parts by weight of the acrylate compound, interfacial peeling with the external pressure-sensitive adhesive layer 140 may be caused.

In particular, the external pressure-sensitive adhesive layer 140 is added two kinds of photoinitiator, that is, the first photoinitiator and the second photoinitiator reacting in different wavelength bands. In this case, a photoinitiator reacting in the wavelength range of 260 ~ 330nm is used as the first photoinitiator, and a photoinitiator reacting in the wavelength range of 331 ~ 360nm is used as the second photoinitiator. After the first photoinitiator is manufactured for the semi-cured optical pressure-sensitive adhesive film 100, the first photoinitiator is added for the purpose of performing post-curing using ultraviolet rays having a specific wavelength of 260 to 330 nm, and the second photoinitiator is prepared for the optical adhesive film 100. In order to make the acrylate-based compound in a liquid state into a solid phase, it plays a role of initiating a monomer present in the acrylate-based compound into a polymer.

That is, in order to manufacture the touch screen, the optical adhesive film 100 is attached to at least one of glass, ITO film, and polarizing plate. In this case, since the semi-cured adhesive is used as the external pressure-sensitive adhesive layer 140 to absorb the printing step Although excellent in performance, if left in a high temperature and high humidity atmosphere for a long time may cause the generation of bubbles and turbidity due to deformation, in the present invention, in order to prevent this in advance, two kinds of photoinitiators reacting at different wavelength bands After attaching the optical adhesive film 100 to at least one of glass, ITO film, and polarizing film through the addition of the first and second photoinitiators, it was post-cured to improve high temperature and high humidity reliability.

Therefore, in the optical adhesive film 100 for the touch screen panel according to the embodiment of the present invention, the optical pressure-sensitive adhesive film is added to the external pressure-sensitive adhesive layer 140 by adding the first and second photoinitiators, which are two photoinitiators reacting at different wavelengths. When the film 100 is attached to at least one of glass, ITO film, and polarizing film, it may maintain a semi-cured state to exhibit excellent printing step absorbency, and the optical adhesive film 100 may be formed of glass, ITO film, and polarizing film. After attaching to one or more, by using the first photoinitiator reacting in the wavelength range of 260 ~ 330nm to post-cure the external pressure-sensitive adhesive layer 140 to increase the degree of curing it is possible to improve the high temperature and high humidity reliability.

In this case, the first photoinitiator should be substantially bonded to the polymer chain in the outer pressure-sensitive adhesive layer 140, acrylate with benzophenone-based compound is suitable. Therefore, it is preferable to use benzophenone methacrylate (BPMA) as a 1st photoinitiator.

When the amount of the first photoinitiator is less than 0.1 part by weight based on 100 parts by weight of the acrylate compound, the curing of the outer pressure-sensitive adhesive layer 140 through ultraviolet irradiation may not be sufficiently performed to improve the high temperature and high humidity reliability. It can be difficult to get it right. On the contrary, when the amount of the first photoinitiator added exceeds 100 parts by weight with respect to 100 parts by weight of the acrylate-based compound, the reaction is rapidly made during the post-cure of the outer pressure-sensitive adhesive layer through ultraviolet irradiation, and the internal pressure-sensitive adhesive layer 120 Interfacial delamination can be made.

As the second photoinitiator, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropanone-1,2,4-diethylthioxanthone, 2-ethyl One or more selected from aromatic ketones of anthraquinone and phenanthrenequinone can be used.

When the amount of the second photoinitiator added is less than 0.1 part by weight based on 100 parts by weight of the acrylate compound, there is a problem in that high temperature and high humidity reliability are deteriorated. On the contrary, when the amount of the second photoinitiator is added in an amount of more than 0.5 parts by weight based on 100 parts by weight of the acrylate compound, it may cause a change over time due to the excessive content of the second photoinitiator.

The silane coupling agent acts as an adhesion promoter to promote adhesion. Such silane coupling agents include 2- (3,4 epoxy cyclohexyl) -ethyltrimethoxysilane, 3-glycidoxycitrimethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2 containing amine groups (Aminoethyl) 3-amitopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyl Trimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysil-N- (1,3-dimethylbutylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, mer One or more selected from capto-containing 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, isocyanate-containing 3-isocyanatepropyltriethoxysilane and the like can be used.

In this case, the silane coupling agent is preferably added in an amount ratio of 0.1 to 0.5 parts by weight based on 100 parts by weight of the acrylate compound, which has a problem in that the adhesion reliability is lowered when the amount of the silane coupling agent is out of the above range. Because. In addition, when the amount of the silane coupling agent added exceeds 0.5 parts by weight, it may cause a change over time due to excessive addition of the silane coupling agent.

The optical adhesive film for a touch screen panel according to the embodiment of the present invention described above has a relative dielectric constant ε r measured at a frequency of 100 kHz by using a low dielectric material as an internal adhesive layer, and thus has a touch screen panel and a liquid crystal. The occurrence of noise can be suppressed even when the distance between the display devices becomes close.

In addition, the optical pressure-sensitive adhesive film for a touch screen panel according to the present invention is added to the outer pressure-sensitive adhesive layer by adding the first and second photoinitiators, which are two kinds of photoinitiators reacting at different wavelength bands, to form the optical adhesive film in glass, ITO film and polarizing plate. When attached to one or more may maintain the semi-cured state to exhibit an excellent printing step absorption, and after attaching the optical adhesive film to one or more of glass, ITO film and polarizing plate, the first reaction reacts in the wavelength range of 260 ~ 330nm It is possible to improve the high temperature and high humidity reliability by post-curing the external pressure-sensitive adhesive layer using a photoinitiator to increase the degree of curing.

Example

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. OCA film manufacture

Example 1

Internal adhesive layer manufacturing

50 weight percent 2-ethylhexyl acrylate (2-EHA), 15 weight percent isobornyl acrylate (IBOA), 15 weight percent hydroxyethyl acrylate (HEA) and 20 weight percent isostearyl acrylate (ISTA) The mixture was mixed and solution polymerization was performed to prepare an acrylate polymer having a weight average molecular weight of 500,000. Next, with respect to 100 parts by weight of the acrylate polymer, 0.3 parts by weight of Irgacure 651 as a photoinitiator, 0.1 parts by weight of hexadiol diacrylate (HDDA) as a photocuring agent, 0.3 parts by weight of a urethane acrylate-based curing agent, and a silane coupling agent 0.2 part by weight of 3-aminopropyltriethoxysilane was added and mixed to obtain an adhesive composition. Next, the pressure-sensitive adhesive composition was bar-coated to a thickness of 115 μm on a release PET, and cured by irradiating UV for 5 minutes to prepare an inner pressure-sensitive adhesive layer.

External adhesive layer manufacturing

50% by weight 2-ethylhexylacrylate (2-EHA), 15% by weight ethylhexylmethylacrylate (EHMA), 15% by weight hydroxyethyl acrylate (HEA) and 20% by weight isostearyl acrylate (ISTA) After mixing, 0.2 parts by weight of benzophenone methacrylate, which is the first photoinitiator, was added to 100 parts by weight of the above mixture, and a solid content of 22 wt% was prepared by thermal polymerization. Next, with respect to 100 parts by weight of the acrylate polymer, 0.3 parts by weight of Irgacure 651 as the second photoinitiator, 0.01 parts by weight of hexadiol diacrylate (HDDA) as the photocuring agent, 0.1 parts by weight of the urethane acrylate-based curing agent, silane coupler After mixing 0.2 parts by weight of 3-aminopropyltriethoxysilane with a ringing agent, the release PET was coated with a thickness of 30 μm and irradiated with UV for 5 minutes to prepare an outer pressure-sensitive adhesive layer in the form of a film.

OCA film manufacturing

An outer adhesive layer having a thickness of 30 μm, an inner adhesive layer having a thickness of 115 μm, and an outer adhesive layer having a thickness of 30 μm were sequentially stacked on the release PET, and then laminated by laminating to prepare a three-layered OCA film.

Example 2

In manufacturing the OCA film, Example 1 except that the outer pressure-sensitive adhesive layer having a thickness of 50 μm, the inner pressure-sensitive adhesive layer having a thickness of 75 μm, and the outer pressure-sensitive adhesive layer having a thickness of 50 μm were sequentially laminated on a release PET, and then laminated by laminating. In the same manner as in the three-layer structure of the OCA film was prepared.

Example 3

In manufacturing the OCA film, Example 1 except that the outer pressure-sensitive adhesive layer having a thickness of 20 μm, the inner pressure-sensitive adhesive layer having a thickness of 135 μm, and the outer pressure-sensitive adhesive layer having a thickness of 20 μm were sequentially laminated on a release PET, and then laminated by laminating. In the same manner as in the three-layer structure of the OCA film was prepared.

Comparative Example 1

In preparing the inner pressure-sensitive adhesive layer, 50% by weight of 2-ethylhexyl acrylate (2-EHA), 30% by weight of isobornyl acrylate (IBOA) and 20% by weight of hydroxyethyl acrylate (HEA) were mixed, and the OCA film In manufacturing, the same procedure as in Example 1 was carried out except that a 15 μm-thick outer pressure-sensitive adhesive layer, a 115 μm-thick inner pressure-sensitive adhesive layer, and a 15 μm-thick outer pressure-sensitive adhesive layer were sequentially laminated on a release PET, and then laminated by laminating. An OCA film having a three-layer structure was prepared by the method.

Comparative Example 2

In preparing the OCA film, Comparative Example 1 except that the outer pressure-sensitive adhesive layer having a thickness of 50 μm, the inner pressure-sensitive adhesive layer having a thickness of 45 μm, and the outer pressure-sensitive adhesive layer having a thickness of 50 μm were sequentially laminated on a release PET, and then laminated by laminating. In the same manner as in the three-layer structure of the OCA film was prepared.

2. Property evaluation

Table 1 shows the dielectric constant measurement results for the OCA film prepared according to Examples 1 to 3 and Comparative Examples 1 to 2.

1) permittivity evaluation

The relative dielectric constant (ε r ) was measured after contacting electrodes on both sides of the OCA films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 according to the following apparatus and the following conditions.

Measuring instrument: Agilent Technologies E4980A LCR meter

Test Frequencies: 100 kHz

Electrode diameter: 5 mm

TABLE 1

Figure 112016000932207-pat00001

As shown in Table 1, in the case of the OCA film prepared according to Examples 1 to 3, it can be seen that the relative dielectric constant (ε r ) measured at a frequency of 100kHz satisfies the low dielectric constant characteristics of 3.31 to 3.62.

On the other hand, in the case of the outer pressure-sensitive adhesive layer prepared according to Comparative Examples 1 and 2, the relative dielectric constant ε r measured at a frequency of 100 kHz was measured as 4.08 and 4.11, respectively, where the target value exceeds 3.5.

Table 2 shows the printing step absorption capacity and high temperature and high humidity reliability evaluation results for the OCA film prepared according to Examples 1 to 3 and Comparative Examples 1 to 2.

2) Evaluation of printing step absorption and high temperature / high humidity reliability

The test was performed with a total of 5 types of glass in which the printing level | step difference was 5 micrometers, 10 micrometers, 15 micrometers, 20 micrometers, and 25 micrometers on glass of 100 mm x 150 mm x 1.1 mm, respectively. At this time, the OCA prepared according to Examples 1 to 3 and Comparative Examples 1 to 2 were laminated on the printing step (structure 1). Thereafter, a polarizing film was attached onto a glass of 80 mm × 140 mm × 0.55 mm (structure 2). Thus, the two structures were laminated using a laminator, but the overall structure was laminated with the structure of stepped glass / OCA / polarizing film / 0.55 mm general glass.

Next, an autoclave treatment was performed at 40 ° C. at 4 bar for 20 minutes, followed by exposure to UV 3J using a metal halide lamp, followed by post curing. Thereafter, after confirming the printing step absorption capacity, it was left in the oven at 85 ℃ / 85% for 100 hours to confirm the reliability of the high temperature / high humidity.

TABLE 2

Figure 112016000932207-pat00002

As shown in Table 2, in the case of the OCA film prepared according to Examples 1 to 3 and Comparative Examples 1 to 2 can be filled up to the printing step of 15 ~ 20㎛ without the generation of bubbles, the cloudiness did not occur Confirmed.

However, in the case of the OCA films prepared according to Examples 1 to 3, no interfacial failure occurred when the adhesive force was measured, but in the case of the OCA films prepared according to Comparative Examples 1 to 2, the interfacial failure occurred to cause the internal pressure-sensitive adhesive layer and the external pressure-sensitive adhesive layer. It was visually confirmed that a part of was separated, which is considered to be due to the weak interfacial adhesion between the inner pressure-sensitive adhesive layer and the outer pressure-sensitive adhesive layer.

Although the above has been described with reference to the embodiments of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications can be said to belong to the present invention without departing from the scope of the technical idea provided by the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

100: optical adhesive film
120: inner pressure-sensitive adhesive layer
140: outer pressure-sensitive adhesive layer

Claims (13)

Internal pressure-sensitive adhesive layer; And
And an outer pressure sensitive adhesive layer formed on the top and bottom surfaces of the inner pressure sensitive adhesive layer, respectively.
The inner pressure-sensitive adhesive layer has a first thickness,
The outer pressure-sensitive adhesive layer has a second thickness thinner than the first thickness,
The first thickness is 50 ~ 200㎛,
The second thickness is 20-60 μm,
Optical adhesive film for touch screen panels having a relative dielectric constant (ε r ) of 3.5 or less measured at a frequency of 100 kHz.
delete delete The method of claim 1,
The inner pressure-sensitive adhesive layer includes an acrylate compound, a photocuring agent, a photoinitiator and a silane coupling agent,
The external pressure-sensitive adhesive layer is an optical adhesive film for a touch screen panel including an acrylate compound, a photocuring agent, a first photoinitiator, a second photoinitiator and a silane coupling agent.
The method of claim 4, wherein
The acrylate compound of the inner pressure-sensitive adhesive layer is
Optical adhesive film for touch screen panels comprising an acrylate monomer having a weight average molecular weight of 100,000 to 1,500,000.
The method of claim 4, wherein
The acrylate compound of the inner pressure-sensitive adhesive layer is
Optical for touch screen panels comprising at least one selected from 2-ethylhexyl acrylate (2-EHA), hydroxyethyl acrylate (HEA), isobornyl acrylate (IBOA) and isostearyl acrylate (ISTA) Adhesive film.
The method of claim 4, wherein
The inner pressure-sensitive adhesive layer
An optical adhesive film for touch screen panels composed of 0.1 to 0.5 parts by weight of a photocuring agent, 0.1 to 0.5 parts by weight of a photoinitiator, and 0.1 to 0.3 parts by weight of a silane coupling agent based on 100 parts by weight of an acrylate compound.
The method of claim 4, wherein
The acrylate compound of the outer pressure-sensitive adhesive layer
2-ethylhexyl acrylate (2-EHA), ethylhexyl methyl acrylate (EHMA), isobornyl acrylate (IBoA), isostearyl acrylate (ISTA), 4-hydroxybutyl acrylate (4-HBA ), Hydroxyethyl acrylate (HEA), butyl acrylate, hexyl acrylate, n-octyl acrylate and isooctyl acrylate optical adhesive film for a touch screen panel comprising at least one selected from acrylate monomers .
The method of claim 4, wherein
The outer pressure-sensitive adhesive layer
For a touch screen panel composed of 0.01 to 2 parts by weight of a photocuring agent, 0.1 to 10 parts by weight of a first photoinitiator, 0.1 to 0.5 parts by weight of a second photoinitiator, and 0.1 to 0.5 parts by weight of a silane coupling agent based on 100 parts by weight of an acrylate compound. Optical adhesive film.
The method of claim 9,
The first photoinitiator
An optical adhesive film for a touch screen panel reacting in the wavelength range of 260 ~ 330nm, the second photoinitiator reacts in the wavelength range of 331 ~ 360nm.
The method of claim 9,
The first photoinitiator
Optical adhesive film for touch screen panels containing benzophenone methacrylate (BPMA).
The method of claim 9,
The second photoinitiator
2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxycyclohexyl Of -phenyl-ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropanone-1,2,4-diethylthioxanthone, 2-ethylanthraquinone and phenanthrenequinone Optical adhesive film for touch screen panels comprising at least one selected from aromatic ketones.
The method of claim 4, wherein
The silane coupling agents of the inner and outer pressure-sensitive adhesives, respectively
2- (3,4 epoxy cyclohexyl) -ethyltrimethoxysilane, 3-glycidoxycitrimethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2 (aminoethyl) with amine group 3 -Amitopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysil-N- (1,3-dimethylbutylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3 containing mercapto An optical adhesive film for touch screen panels comprising at least one selected from -mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane and 3-isocyanatepropyltriethoxysilane containing isocyanate.
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