TW202041643A - Ultraviolet-curable liquid organopolysiloxane composition for image display device adhesive for image display device comprising said composition image display device using said adhesive and method for adhesion using said adhesive - Google Patents

Abstract

Provided is an ultraviolet-curable liquid organopolysiloxane composition for an image display device, which is capable of providing a cured product that has high transparency, excellent adhesiveness, good high-temperature durability, and excellent step-difference followability, and which is capable of being heat-cured even in a dark region. The ultraviolet-curable liquid organopolysiloxane composition for an image display device is characterized by containing: 100 parts by mass of (A) an organopolysiloxane or a mixture thereof with a mass ratio (A-1):(A-2) of (A-1) and (A-2) in the range of 100: 0 to 50: 50, (A-1) being a linear organopolysiloxane having at least two structures represented by general formula (1) in the molecule, and (A-2) being a branched organopolysiloxane having at leastone structure represented by general formula (1) in the molecule; 0.01 to 10 parts by mass of (B) a photopolymerization initiator; and (C) 0.01-5 parts by mass of a peroxide having a one-hour decomposition half-life temperature of 50-100 DEG C.

Description

Ultraviolet curing type liquid organopolysiloxane composition for image display device, adhesive for image display device containing the composition, image display device using the adhesive, and adhesion method using the adhesive

The present invention relates to an ultraviolet curable liquid organopolysiloxane composition for image display devices, an adhesive for image display devices containing the composition, an image display device using the adhesive, and an adhesive method using the adhesive.

The touch panel of the optical display element (also referred to as a touch screen panel) is a combination of an image display unit such as a liquid crystal display device, and an input unit of a device that immediately recognizes the coordinate axis and performs input. The input part is formed by bonding a support plate (glass plate or resin plate) having a transparent conductive film (transparent conductive film) such as ITO (indium-tin oxide) and the cover panel (glass or resin), for example. The input part is usually formed by replacing the panel formed on the outermost surface of the display surface of an FPD (flat panel display) or CRT (Brown tube) such as a liquid crystal display. The touch panel with an image display unit and an input unit can be combined with software to achieve various operability.

In addition, there are various types of touch panels. Two types of resistive film type and capacitive type are the mainstream. The capacitive type can be further classified into a surface capacitive type and a projected capacitive type. The projection type of the latter uses XY grid drive electrodes. The cumulative calculation method is known as wired sensing type and grid type. In addition, the gate type is known as a self-capacitance detection method using one sensor and a mutual-capacitance detection method using two transmitting and receiving sensors. In addition, types other than the resistive film type and the capacitive type include an optical type, an ultrasonic type, an electromagnetic induction type, and an embedded type.

The adhesive (adhesive sheet) used in the touch panel can be used for bonding the cover panel of the outermost surface in direct contact with the ITO surface and the support plate with the ITO surface, and the support plate and the back (image display part) In the case of a liquid crystal display, it is the bonding of polarizing plate, TAC film, etc.). In addition, when bonding the entire surface of a support plate having an ITO surface and a liquid crystal display (polarizing plate) on the back side (backlight side), etc., a baseless double-sided adhesive sheet called optical bonding is used. The physical properties required for this adhesive sheet are different from those used for bonding the cover panel and the support plate with an ITO surface.

In the past, the adhesives (also known as pressure sensitive adhesives) or adhesive sheets used in this application had problems with durability, especially at high temperatures or high humidity. It has been observed that fine bubbles or occurrences of bubbles are observed in high temperature environments. Coloring, white turbidity or peeling of the adhesive layer under high temperature and high humidity environment, generation of fine bubbles. In addition, the recent trend is to decorate the flat image display part by printing and other methods in order to improve the style. However, in the case where the adhesive is directly attached to the resulting height difference, there will be problems such as mixing of bubbles, and it is difficult to balance the durability improvement of the former and the height difference compliance of the latter.

Patent Document 1 discloses an adhesive that can suppress the generation of air bubbles when a transparent panel having a flat image display portion and a decorative portion (a height difference portion) is bonded. However, the adhesive component uses a monomer containing a carboxyl group, so when it directly touches the metal surface or metal thin film layer, metal corrosion occurs, so it is difficult to use for this purpose (for the bonding of the cover panel and the ITO surface) .

In addition, in projection type capacitors, etc., the acid component contained in the adhesive will corrode the transparent conductive film such as ITO formed on the glass or resin sheet or film, or the circuit obtained by etching it, and Problems with fine metal wiring such as silver, copper, and aluminum.

Patent Document 2 discloses an adhesive composition that uses an alkoxyacrylate that does not contain a carboxyl group-containing monomer as a main monomer component and does not corrode the metal thin film layer. However, the adhesive layer may become cloudy under high temperature and high humidity, and it cannot be said to have sufficient performance as an adhesive for touch panels, and the problem has not been completely solved.

Patent Document 3 discloses a transparent organosiloxane composition useful for light-emitting diode (LED) device applications. However, a cured product formed by curing the composition by ultraviolet radiation has too hard rubber hardness. There is a problem of uneven liquid crystal display, and the composition is insufficient for use as an image display device.

Patent Document 4 is a composition that is suitable as an adhesive for image display devices from the viewpoint of physical properties. However, there are difficulties in the curability of dark areas. Therefore, depending on the structure of the module, there will be a problem of unhardened parts where light is not irradiated.

Although Patent Document 5 mentions countermeasures against hardening of the dark part, the use of mercapto groups may cause problems such as odor and corrosion. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] 　JP 2009-155503 A [Patent Document 2] 　JP 2009-79203 A [Patent Document 3] 　Japanese Patent No. 5015571 [Patent Document 4] 　JP 2016-190974 A [Patent Document 5] 　JP 2016-60783 A

[The problem to be solved by the invention]

The present invention has been completed in view of the above-mentioned problems, and its object is to provide an ultraviolet curable liquid organopolysiloxane composition for image display devices, which can produce high transparency, excellent adhesion, good durability at high temperatures, and difference in height. Hardened products with excellent compliance, and dark parts that are not exposed to light can be hardened by heating. Another purpose is to provide an adhesive for an image display device containing the composition, an image display device using the adhesive, and an adhesive method using the adhesive. [Means used to solve the problem]

[式中，m為0、1或2之整數、R¹ 為氫原子、苯基或鹵苯基、R² 為氫原子或甲基、R³ 為可相同或相異之碳原子數1～10之一價有機基、Z¹ 為由-R⁴ -、-R⁴ O-或-R⁴ SiR³ ₂ O-(此處，R³ 與上述同樣，R⁴ 為可相同或相異之碳原子數1～10之二價有機基)所表示之二價基、Z² 為氧原子或可相同或相異之碳原子數1～10之二價有機基] (B)光聚合起始劑：0.01～10質量份、 (C)1小時分解半衰期溫度為50℃至100℃的過氧化物：0.01～5質量份。In order to achieve the above object, the present invention provides an ultraviolet curable liquid organopolysiloxane composition for image display devices, which is characterized by containing: (A) the following (A-1), (A-2) The mass ratio of (A-1): (A-2) Organopolysiloxane or its mixture in the range of 100:0-50:50: 100 parts by mass, (A-1) has at least two parts in the molecule The linear organopolysiloxane (A-2) of the structure represented by the general formula (1) has at least one branched organopolysiloxane of the structure represented by the following general formula (1) in the molecule

[In the formula, m is an integer of 0, 1, or 2, R ¹ is a hydrogen atom, a phenyl group or a halophenyl group, R ² is a hydrogen atom or a methyl group, and R ³ is the same or different carbon atoms from 1 to one 10 monovalent organic group, Z ¹ by -R ⁴ -, - R ⁴ O- or -R ⁴ SiR ³ ₂ O- (where, R ³ as described above, R ⁴ may be the same as or different from the carbon A divalent organic group with 1 to 10 atoms), Z ² is an oxygen atom or a divalent organic group with 1 to 10 carbon atoms that may be the same or different] (B) Photopolymerization initiator : 0.01-10 parts by mass, (C) Peroxide with a decomposition half-life temperature of 50°C to 100°C in 1 hour: 0.01-5 parts by mass.

If it is such a composition, it can produce a cured product with high transparency, excellent adhesiveness, good durability at high temperatures, and excellent step compliance, and dark parts that are not exposed to light can be cured by heating , And can prevent thermal deterioration of various substrates used in image display devices. In addition, the storage stability is also good.

In addition, in the aforementioned general formula (1), it is preferable that Z ¹ is a divalent organic group represented by -R ⁴ -, and Z ² is an oxygen atom.

In addition, in the aforementioned general formula (1), Z ¹ is a divalent group represented by -R ⁴ O- or -R ⁴ SiR ³ ₂ O-, and Z ² is the same or different carbon number from 1 to The divalent organic group of 10 is better.

If this kind of composition is easy to be photohardened.

In addition, in the present invention, there is provided an adhesive for image display devices, which is characterized by containing the ultraviolet curable liquid organopolysiloxane composition for image display devices of the present invention.

If it is such an adhesive, it is suitable for use as a cover panel and a transparent conductive film used to connect the FPD panel and the image display part, the input part and the image display part of the touch panel, and the input part of the touch panel. Adhesive to support the adhesion of boards.

In addition, in the present invention, there is provided an image display device, which is characterized by using the above-mentioned adhesive for image display devices of the present invention to bond the panel and the image display portion.

In addition, in the present invention, there is provided an image display device, which is characterized by using the above-mentioned adhesive for image display devices of the present invention to combine a support plate with a transparent conductive film and an image display portion, and a cover panel and the aforementioned support plate. At least any combination of them is attached.

The composition of the present invention can produce a cured product with high transparency, excellent adhesiveness, good durability at high temperatures, and excellent step compliance, and dark parts that are not irradiated with light can be cured by heating. Therefore, the image display device using the adhesive containing the composition of the present invention has good durability at high temperatures.

In addition, the present invention provides an adhesive method characterized by: using the adhesive for image display devices of the present invention to combine the panel and the image display portion, the cover panel, and the support plate with a transparent conductive film, and the image display portion It is bonded to any combination of supporting plates having a transparent conductive film.

According to this bonding method, any combination of the panel and the image display unit, the cover panel and the support plate with the transparent conductive film, and the image display unit and the support plate with the transparent conductive film can be bonded reliably.

In addition, the present invention also provides the above-mentioned adhesion method, which includes both the curing step of the adhesive by UV irradiation and the curing step of the adhesive by heating.

In this case, it is preferable to perform the curing step of the adhesive by heating after the curing step of the adhesive by UV irradiation.

If it is this kind of adhesion method, dark parts that are not irradiated with light can be cured by heating, so the panel and the image display part, the cover panel and the support plate with the transparent conductive film, and the image display part can be more reliably achieved Bonding with any combination of supporting plates having a transparent conductive film.

In addition, in the present invention, in the aforementioned adhesion method, the temperature of the aforementioned curing step of the aforementioned adhesive by heating is preferably 90°C or less.

If this kind of adhesion method is used, low-temperature heating can harden the dark parts that are not irradiated with light, and it can also prevent the thermal deterioration of various components (base materials, etc.) used in the image display device, so that the panel can be further reliably achieved It is bonded to any combination of the image display part, the protective cover panel and the support plate with the transparent conductive film, and the image display part and the support plate with the transparent conductive film. [Effects of Invention]

The composition of the present invention has excellent coating properties, and can be cured by ultraviolet light to produce a cured product with excellent transparency, adhesiveness, durability, heat discoloration resistance, and height difference compliance, and can also be used in dark parts that are not exposed to light Harden by heating. In addition, the composition of the present invention is not corrosive to transparent conductive films such as ITO. That is, it has excellent corrosion resistance. In addition, when the composition of the present invention is used for adhesion of various substrates, especially FPDs, curved panel displays, touch panels, etc., even under high temperature and high humidity conditions, display unevenness in the liquid crystal portion is unlikely to occur. Therefore, the composition of the present invention is suitable for use in image display devices, for example, for FPD, curved panel display, touch panel, especially capacitive touch panel, image display unit/panel protection (sealing), Adhesive materials for various substrates such as glass, acrylic, polycarbonate, and PET are useful.

The present invention will be described in further detail below.

As mentioned above, there is a need for a UV-curable liquid organopolysiloxane composition for image display devices, which can produce curing with high transparency, excellent adhesion, good durability at high temperatures, and excellent step compliance. Objects and dark parts that are not exposed to light can also be hardened by heating.

The inventors of the present invention studied and reviewed in order to achieve the above object. As a result, they found that an ultraviolet curable liquid organopolysiloxane composition for image display devices containing the following components (A) to (C) can solve the above-mentioned problems, and completed the present invention.

The following specifically describes the embodiments of the present invention, but the present invention is not limited thereto. In addition, in the following description, the molecular weight is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography.

[式中，m為0、1或2之整數、R¹ 為氫原子、苯基或鹵苯基、R² 為氫原子或甲基、R³ 為可相同或相異之碳原子數1～10之一價有機基、Z¹ 為由-R⁴ -、-R⁴ O-或-R⁴ SiR³ ₂ O-(此處，R³ 與上述同樣，R⁴ 為可相同或相異之碳原子數1～10之二價有機基)所表示之二價基、Z² 為氧原子或可相同或相異之碳原子數1～10之二價有機基] (B)光聚合起始劑：0.01～10質量份、 (C)1小時分解半衰期溫度為50℃至100℃的過氧化物：0.01～5質量份。[Ultraviolet curable liquid organopolysiloxane composition] The ultraviolet curable liquid organopolysiloxane composition for image display devices of the present invention contains: (A) the following (A-1), (A- 2) Mass ratio (A-1): (A-2) Organopolysiloxane or its mixture in the range of 100:0-50:50: 100 parts by mass, (A-1) has at least two A linear organopolysiloxane having a structure represented by the following general formula (1) (A-2) has at least one branched organopolysiloxane having a structure represented by the following general formula (1) in the molecule

[In the formula, m is an integer of 0, 1, or 2, R ¹ is a hydrogen atom, a phenyl group or a halophenyl group, R ² is a hydrogen atom or a methyl group, and R ³ is the same or different carbon atoms from 1 to one 10 monovalent organic group, Z ¹ by -R ⁴ -, - R ⁴ O- or -R ⁴ SiR ³ ₂ O- (where, R ³ as described above, R ⁴ may be the same as or different from the carbon A divalent organic group with 1 to 10 atoms), Z ² is an oxygen atom or a divalent organic group with 1 to 10 carbon atoms that may be the same or different] (B) Photopolymerization initiator : 0.01-10 parts by mass, (C) Peroxide with a decomposition half-life temperature of 50°C to 100°C in 1 hour: 0.01-5 parts by mass.

If it is such a composition, it can produce a cured product with high transparency, excellent adhesiveness, good durability at high temperatures, and excellent step compliance, and dark parts that are not exposed to light can be cured by heating . In addition, since it is liquid, it is excellent in handleability.

-(A) Ingredient- The (A) component constituting the composition of the present invention is the mass ratio (A-1) of the following (A-1) and (A-2): (A-2) is in the range of 100:0-50:50 Organopolysiloxane or mixtures thereof.

In the present invention, the component (A-1) can be used alone as the component (A), and it is preferable to use the component (A-1) and the component (A-2) together as the component (A). By setting (A) component as a mixture of linear organopolysiloxane of component (A-1) and branched organopolysiloxane of component (A-2), the composition of the present invention becomes the The cured product obtained by curing the composition has a moderate hardness. If it is such a composition, it is more suitable for use as an image display device.

(式中，m、R¹ 、R² 、R³ 、Z¹ 、Z² 與上述同樣。) ，並且是不具有SiO_4/2 單元及SiO_3/2 單元，僅由SiO_2/2 與SiO_1/2 單元所構成的直鏈狀的有機聚矽氧烷。The component (A-1) uses organopolysiloxanes having at least two structures represented by the general formula (1) in the molecule,

(In the formula, m, R ¹ , R ² , R ³ , Z ¹ , and Z ² are the same as the above.) And it does not have SiO _4/2 units and SiO _3/2 units, only SiO _2/2 and SiO A linear organopolysiloxane composed of _1/2 unit.

In the general formula (1), the monovalent organic group with 1 to 10 carbon atoms represented by R ³ specifically includes methyl, ethyl, propyl, isopropyl, butyl, and isobutyl , Tert-butyl, pentyl, neopentyl, hexyl, cyclohexyl, octyl, nonyl, decyl and other alkyl groups; phenyl, tolyl, stubyl, naphthyl and other aromatic groups; benzyl, Aralkyl such as phenethyl and phenylpropyl; vinyl, allyl, propenyl, isopropenyl, butenyl, hexenyl, cyclohexenyl, octenyl and other alkenyl groups Hydrocarbyl groups; substituted hydrocarbon groups in which some or all of the hydrogen atoms in these hydrocarbon groups are replaced by halogen atoms such as fluorine, bromine and chlorine, cyano groups, etc., such as chloromethyl, chloropropyl, bromoethyl, trifluoropropyl, etc. Halogen-substituted alkyl, cyanoethyl, etc. even include groups in which a part of the hydrocarbon chain of these substituted or unsubstituted hydrocarbon groups contains ether bonds (etheric oxygen atoms), amide bonds, etc. . In addition, the monovalent organic group represented by R ³ preferably has about 1 to 8 carbon atoms.

Examples of the divalent organic group with 1 to 10 carbon atoms represented by R ⁴ or Z ² include substituted or unsubstituted divalent hydrocarbon groups, such as methylene, ethylene, trimethylene, etc. Alkyl groups, etc., some or all of the hydrogen atoms of these hydrocarbon groups may be substituted by halogen atoms such as fluorine, bromine, chlorine, etc., cyano groups, etc., and also include groups containing ether bonds, amide bonds, etc. in these hydrocarbon chains .

In the above general formula (1), when Z ¹ is a divalent organic group represented by -R ⁴ -, Z ² is preferably an oxygen atom, and Z ¹ is -R ⁴ O- or -R ⁴ SiR ³ ₂ O In the case of the divalent group represented by -, Z ² may be the same or different divalent organic groups with 1 to 10 carbon atoms. This makes it easy to light harden.

Specific examples of groups having the structure represented by the above general formula (1) include groups represented by the following formulas and the like.

The organopolysiloxane of the component (A-1) is illustrated below. Among these polysiloxanes, the arrangement of each siloxane repeating unit can be random or block. In addition, these organopolysiloxanes can be used alone or in combination of two or more as the (A-1) component.

(式中，括弧內的矽氧烷單元的排列順序為任意。)

(In the formula, the order of the siloxane units in parentheses is arbitrary.)

(式中，括弧內的矽氧烷單元的排列順序為任意。)

(In the formula, the order of the siloxane units in parentheses is arbitrary.)

(式中，括弧內的矽氧烷單元的排列順序為任意。)

(In the formula, the order of the siloxane units in parentheses is arbitrary.)

(A-1) It is suitable that the component has a viscosity of 100 to 200,000 mPa･s at 25°C. (A-1) The suitable range of the viscosity of the component is 500 to 50,000 mPa･s, and the more suitable range is 1,000 to 5,000 mPa･s. When the viscosity of the component (A-1) is 100mPa･s or more, the cured product obtained by irradiating the composition of the present invention with ultraviolet rays will not become too hard and is suitable for use as an image display device. In (A-1) When the viscosity of the component is 200,000 mPa･s or less, the workability is excellent.

(A-1) The molecular weight of the linear organopolysiloxane of the component is not particularly limited, and the weight average molecular weight in terms of polystyrene is preferably 2,000 to 100,000.

(式中，m、R¹ 、R² 、R³ 、Z¹ 、Z² 與上述同樣。) ，並且為含有SiO_4/2 單元及/或SiO_3/2 單元之分支狀有機聚矽氧烷。The organopolysiloxane of component (A-2) is an organopolysiloxane having at least one structure represented by the general formula (1) in the molecule:

(In the formula, m, R ¹ , R ² , R ³ , Z ¹ , and Z ² are the same as above.), and are branched organopolysiloxanes containing SiO _4/2 units and/or SiO _3/2 units .

Here, it is preferable to contain _1-50 mol% of SiO _4/2 units and/or SiO _3/2 units with respect to the total of the siloxane units of the component (A-2).

The component (A-2), provided that the component (A-1) above is used, should be used in a mass ratio of (A-1):(A-2) in the range of 100:0-50:50. It is used in the range of 100:0 to 60:40, preferably 99:1 to 60:40. If the amount of (A-2) component exceeds 50%, the hardness of the obtained hardened product will become too hard, so the adhesiveness or height difference compliance will be poor. When used as an adhesive for image display devices, it will It becomes one of the reasons for the unbalanced display.

The organopolysiloxane of the component (A-2) is illustrated below. These organopolysiloxanes can be used alone or in combination of two or more as the component (A-2).

It is formed by the following MA unit (SiO _1/2 ), M unit (SiO _1/2 ) and Q unit (SiO _4/2 ). The molar ratio of these units is MA:M:Q=1:4:5 And organopolysiloxane with a weight average molecular weight of 5,000 in terms of polystyrene

It is formed by the following MA-D unit (SiO _2/2 ), D unit (SiO _2/2 ) and T unit (SiO _3/2 ). The molar ratio of these units is MA-D: D: T=2 : 6:7, and polystyrene conversion weight average molecular weight of 3,500 organopolysiloxane

The component (A-2), like the component (A-1), is suitable to have a viscosity of 100 to 200,000 mPa･s at 25°C. (A-2) The suitable range of the viscosity of the component is 500 to 50,000 mPa･s, and the more suitable range is 1,000 to 10,000 mPa･s. When the viscosity of the component (A-2) is 100mPa･s or more, the cured product obtained by irradiating the composition of the present invention with ultraviolet rays will not become too hard and is suitable for use in image display devices. The component (A-2) When the viscosity is 200,000mPa･s or less, it has excellent operability.

(A-2) The molecular weight of the branched organopolysiloxane of the component is not particularly limited, and the weight average molecular weight in terms of polystyrene is preferably 2,000 to 100,000.

(式中，m、R¹ 、R² 、R³ 、Z¹ 與上述同樣。) 宜為由下式所表示的化合物，

(式中，m、R¹ 、R² 、R³ 、Z¹ 、Z² 與上述同樣。) 較具體而言，例如藉由1,3-雙(3-甲基丙烯醯氧基丙基)四甲基二矽氧烷與1,1,3,3-四甲基二矽氧烷在酸觸媒存在下進行平衡化反應所得到的(3-甲基丙烯醯氧基丙基)-1,1,3,3-四甲基二矽氧烷，和含有脂肪族不飽和基(可列舉例如乙烯性不飽和基及乙炔性不飽和基)的有機聚矽氧烷，在氯化鉑酸觸媒存在下進行氫矽烷化反應，以此方法可製造出適合於本發明的化合物，然而不受上述合成方法限制。另外，上述含有脂肪族不飽和基的有機聚矽氧烷，可藉由含有具有脂肪族不飽和基的有機烷氧基矽烷的烷氧基矽烷的(共)水解縮合、在酸觸媒存在下的平衡化反應等的周知方法來製造，或可使用市售的產品。The method for synthesizing components (A-1) and (A-2) can be, for example, organohydrogen silanes as shown below,

(In the formula, m, R ¹ , R ² , R ³ , and Z ¹ are the same as described above.) Preferably, they are compounds represented by the following formula,

(In the formula, m, R ¹ , R ² , R ³ , Z ¹ , and Z ² are the same as above.) More specifically, for example, by 1,3-bis(3-methacryloxypropyl) (3-Methylpropionyloxypropyl)-1 obtained by the equilibrium reaction of tetramethyldisiloxane and 1,1,3,3-tetramethyldisiloxane in the presence of an acid catalyst ,1,3,3-Tetramethyldisiloxane, and organopolysiloxanes containing aliphatic unsaturated groups (for example, ethylenic unsaturated groups and acetylene unsaturated groups) are used in chloroplatinic acid The hydrosilylation reaction is carried out in the presence of a catalyst. This method can produce a compound suitable for the present invention, but is not limited by the above-mentioned synthesis method. In addition, the above-mentioned organopolysiloxane containing aliphatic unsaturated groups can be condensed by (co)hydrolysis and condensation of alkoxysilanes containing organoalkoxysilanes with aliphatic unsaturated groups in the presence of an acid catalyst. It can be manufactured by well-known methods such as the equilibrium reaction, or commercially available products can be used.

-(B) Ingredient- (B) As the photopolymerization initiator of the component, any well-known products used as photocuring of acrylic functional groups can be used. For example, benzoin and substituted benzoin (such as alkyl ester-substituted benzoin), dialkoxy styrene such as Michler's ketone, 2,2-diethoxyacetophenone ("DEAP") Ketones, benzophenones and substituted benzophenones, acetophenones and substituted acetophenones, xanthones and substituted xanthones, 2,2-aminophosphine oxide, etc. Specific examples of ideal photopolymerization initiators include diethoxyacetophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, diethoxyxanthone, chlorothioxanthone, Azobisisobutyronitrile, N-methyldiethanolamine benzophenone, bis(2,4,6-trimethylbenzyl)phenyl phosphine oxide and mixtures thereof. Visible light initiators can also be used, examples of which include camphorquinone peroxyester initiators and non-fluorene carboxylic acid peroxyesters. Among these, DEAP is particularly preferred.

The photopolymerization initiator can also be obtained commercially, for example, it can be obtained from BASF's products IRGACURE and DAROCURE. Specifically, there are IRGACURE 184 (1-hydroxycyclohexyl phenone), IRGACURE 907 (2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one ), IRGACURE 369 (2-benzyl-2-N,N-dimethylamino-1-(4-morpholinophenyl)-1-butanone), IRGACURE 500 (1-hydroxycyclohexyl phenone Combination with benzophenone), IRGACURE 651 (2,2-dimethoxy-2-phenylacetophenone), IRGACURE 1700 (bis(2,6-dimethoxybenzyl-2,4 ,4-trimethylphenyl)phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one), IRGACURE 819[bis(2,4,6-trimethylbenzene (Formyl) phenyl phosphine oxide), DAROCURE 1173 (2-hydroxy-2-methyl-1-phenyl-1-propane) and 4265 (2,4,6-trimethylbenzyl diphenyl) -Phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one), visible light (blue) photopolymerization initiator, such as dl-camphorquinone and IRGACURE 784 (double ( η ⁵ -2,4-cyclopentadien-1-yl)-bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl]titanium).

The blending amount of the photopolymerization initiator as the component (B) is 0.01 to 10 parts by mass relative to 100 parts by mass of the component (A). From the perspective of the reactivity and deep curability desired in the present invention, it is particularly Preferably it is 0.1-5 mass parts. If the blending amount is less than 0.01 parts by mass, there is a concern that the reaction may not proceed sufficiently. When it exceeds 10 parts by mass, there are concerns that the obtained cured product does not have transparency, adhesiveness, durability at high temperatures, and compliance with height differences.

(B) A component can be used individually by 1 type or in combination of 2 or more types.

The photopolymerization initiator may be a polymer formed by reacting and bonding initiators. This photopolymerization initiator is described in U.S. Patent Nos. 4,477,326 and 4,587,276.

-(C) Ingredients- The peroxide of the component (C) is not particularly limited as long as it has a decomposition half-life temperature (hereinafter also referred to as "T1") of 50°C to 100°C for 1 hour, and acrylic acid can be used, for example. Any well-known substance used for thermal curing of functional groups. Specific examples are cumyl peroxy neodecanoate (55.0), di-n-propyl peroxy dicarbonate (57.7), diisopropyl peroxy dicarbonate (56.2), di-second butyl peroxy Oxydicarbonate (57.4), 1,1,3,3-tetramethylbutylperoxyneodecanoate (57.5), bis(4-tertiarybutylcyclohexyl)peroxydicarbonate (57.5) , Bis(2-ethylhexyl) peroxydicarbonate (59.1), tertiary hexyl peroxy neodecanoate (62.8), tertiary butyl peroxy neodecanoate (64.8), tertiary butyl peroxy Oxyneoheptanoate (68.2), tertiary hexylperoxypivalate (71.3), tertiary butylperoxypivalate (72.7), bis(3,5,5-trimethylhexyl) ) Peroxide (76.8), dilaurin peroxide (79.5), 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (84.4), disuccinic acid peroxy Oxide (87.0), 2,5-dimethyl-2,5-bis(2-ethylhexylperoxy)hexane (83.4), third hexylperoxy-2-ethylhexanoate ( 90.1), bis(4-methylbenzyl) peroxide (89.3), tert-butylperoxy-2-ethylhexanoate (92.1), bis(3-methylbenzyl) Peroxide-benzyl (3-methylbenzyl) peroxide-dibenzyl peroxide mixture (91.9), dibenzyl peroxide (92.0), etc. Among these, cumyl peroxyneodecanoate, di-n-propyl peroxy dicarbonate, diisopropyl peroxy dicarbonate, di-second butyl peroxy dicarbonate, 1,1 ,3,3-Tetramethylbutylperoxyneodecanoate, bis(4-tertiary butylcyclohexyl) peroxydicarbonate, bis(2-ethylhexyl)peroxydicarbonate, third Hexylperoxyneodecanoate and tert-butylperoxyneodecanoate are preferred, and bis(4-tert-butylcyclohexyl)peroxydicarbonate is particularly preferred. In addition, the parentheses after the compound name indicate the T1 (unit: °C) of each substance.

Peroxide can also be obtained commercially, for example, from NOF Corporation. Specifically, PERCUMYL ND, PEROYL NPP, PEROYL IPP, PEROYL SBP, PEROCTA ND, PEROYL TCP, PEROYL OPP, PERHEXYL ND, PERBUTYL ND, etc. are known.

The one-hour decomposition half-life temperature (T1) of the component (C) must be 50°C to 100°C, preferably 55°C to 65°C. When the half-life temperature is less than 50℃, the storage stability is lacking. In addition, if the half-life temperature exceeds 100°C, it will not harden under the curing condition that is performed twice at 100°C or less, and the dark part hardenability will deteriorate.

The blending amount of the peroxide as the component (C) is 0.01 to 5 parts by mass relative to 100 parts by mass of the component (A). From the viewpoint of the reactivity and deep curability desired in the present invention, it is particularly preferred 01～3 parts by mass. If the blending amount is less than 0.01 parts by mass, there is a concern that the reaction may not proceed sufficiently. When it exceeds 5 parts by mass, there are concerns that the obtained cured product does not have transparency, adhesiveness, and durability at high temperatures.

(C) A component can be used individually by 1 type or in combination of 2 or more types.

-Other ingredients- The composition of the present invention can be blended with other ingredients as necessary.

-Reactive diluent- In order to adjust the viscosity of the composition or the hardness of the cured product, the durability at high temperature, especially the transparency after the wet heat treatment, and even the adhesion to the substrate, the reactivity that does not contain silicone can be added. Thinner.

Known as reactive diluents that do not contain silicone are (meth)acrylates represented by H ₂ C=CGCO ₂ Q. In the above formula, G is hydrogen, halogen, or 1 to about 4 carbon atoms. The alkyl group; Q is selected from alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkaryl, aralkyl or aryl group having 1 to about 16 carbon atoms, any of these can be If necessary, it may be substituted or end-capped with silane, silicon, oxygen, halogen, carbonyl, hydroxyl, ester, carboxylic acid, urea, urethane, urethane, amine, amide, sulfur, sulfonate, turpentine, etc.

Particularly suitable as reactive diluents (meth)acrylates, more specific examples include polyethylene glycol di(meth)acrylate, ethoxylated bisphenol-A (meth)acrylate ("EBIPA) "Or "EBIPMA") like bisphenol-A di(meth)acrylate, tetrahydrofuran (meth)acrylate and di(meth)acrylate, citronellyl acrylate and citronellyl methacrylate, (A Base) hydroxypropyl acrylate, hexanediol di(meth)acrylate ("HDDA" or "HDDMA"), trimethylolpropane tri(meth)acrylate, tetrahydrodicyclopentadienyl (meth) Base) acrylate, ethoxylated trimethylolpropane triacrylate ("ETTA"), triethylene glycol diacrylate and triethylene glycol dimethacrylate ("TRIEGMA"), dioxane two Alcohol di(meth)acrylate (for example, Nippon Kayaku Co., Ltd., KAYARAD R-604, dioxanediol diacrylate), tricyclodecane dimethylol di(meth)acrylate (for example Nippon Kayaku Co., Ltd., KAYARAD R-684, tricyclodecane dimethylol diacrylate, etc.), and isobornyl acrylate and isobornyl methacrylate. Of course, these (meth)acrylates may be used alone or in combination of two or more as reactive diluents.

When using a reactive diluent, what is necessary is just to blend 0.05-50 mass parts with respect to 100 mass parts of (A) component.

-Modifier- The composition of the present invention, in specific applications that require discoloration resistance at high temperatures, and even needs to be adhered to various substrates such as glass, acrylic, polycarbonate, PET, etc., can also contain changes in the desired hardened or unhardened properties. Other ingredients. For example, it can contain (meth)acryloxypropyltrimethoxysilane, trialkyl, or triallyl isocyanurate, glycidoxypropyltrimethoxysilane in an amount of 5 mass% or less. Adhesion promoters like silane and vinyl trimethoxysilane.

In addition, a non-(meth)acrylic silicone diluent or plasticizer can be added in an amount of about 30% by mass. Non-(meth)acrylic polysiloxanes are trimethylsilyl-terminated chemical oils and silicone rubbers with a viscosity of 100 to 10,000 mPa･s at 25°C. In order to be included in the crosslinked structure of the composition of the present invention, the non-(meth)acrylic polysiloxanes may contain a copolymerizable group such as a vinyl group.

-Inorganic filler- An inorganic filler may be added to the composition of the present invention. For example, it can be silica like fumed silica, it can be untreated (hydrophilic) or treated to become hydrophobic. Any kind of fuming silica can be used alone or in combination of two or more. When using an inorganic filler, what is necessary is just to blend 0.1-20 mass parts with respect to 100 mass parts of (A) component.

-Preparation of composition- The method of preparing the composition of the present invention is not particularly limited. The method of preparing the composition of the present invention includes a method of mixing the above-mentioned components together.

The physical properties of the cured product obtained from the composition of the present invention depend on the molecular weight of the reactive silicone of general formula (1), the curing method used, and the like. Generally speaking, the higher the molecular weight of the reactive silicone, the softer the hardening reaction product will be.

-Hardening of the composition- The ultraviolet light source useful for curing the composition of the present invention includes mercury vapor lamps or metal halide lamps that are generally designed to emit ultraviolet energy in various ultraviolet wavelength bands, and LED lamps that emit a single wavelength.

The ultraviolet wavelength range for curing the composition of the present invention is desirably 220 to 450 nm.

The composition of the present invention can be bonded to various substrates (such as image display parts) of the sheet and film constituting the touch panel of the optical display element directly or after being formed into a sheet shape, and the first curing is performed by ultraviolet irradiation. The second hardening is performed by low temperature heating below 100°C.

The heating range for hardening the composition of the present invention is desirably 90°C or less in view of the durability of the peripheral members.

The hardness of the hardened product obtained by hardening the composition of the present invention is not particularly limited. The type A durometer hardness specified in JIS 6249 is preferably 30 or less, preferably 5-25. As long as it has such a hardness, it is more suitable for use as an image display device.

[Adhesives for image display devices] In addition, in the present invention, there is provided an adhesive for image display devices, which contains the ultraviolet curable liquid organopolysiloxane composition for image display devices of the present invention. As long as it is such an adhesive, it is suitable for use as a cover panel and a transparent conductive film used to connect the FPD panel and the image display unit, the input unit and the image display unit of the touch panel, and the input unit of the touch panel. Adhesive to support the adhesion of boards.

[Image display device] In addition, in the present invention, there is provided an image display device obtained by bonding a panel and an image display portion using the adhesive for image display devices of the present invention. In addition, in the present invention, there is provided an adhesive for an image display device of the present invention, which combines at least one of a support plate having a transparent conductive film, an image display portion, a cover panel, and a support plate having a transparent conductive film Any combination of the image display device. The composition of the present invention produces a cured product with high transparency, excellent adhesion, good durability at high temperatures, and excellent step compliance, and dark parts that are not irradiated with light can be cured by heating. Therefore, the image display device using the adhesive containing the composition of the present invention has good durability at high temperatures.

Here, the image display device includes a touch panel, FPD, and curved panel display. In addition, the image display unit may include a liquid crystal module. The liquid crystal module can be a liquid crystal module with liquid crystal, polarizing plate and TAC film. The material of the support plate includes a glass plate, a resin plate, and the like. In addition, the transparent conductive film includes an ITO film. In addition, the materials of the panel and the cover panel include glass, resin, and the like.

The following describes one aspect of the image display device of the present invention with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a touch panel using the adhesive for image display devices of the present invention. As shown in FIG. 1, the touch panel 100 includes an input unit and an image display unit 2, and the input unit includes a cover panel 1 and a support plate having a transparent conductive film. Here, the support plate having a transparent conductive film is an object formed by forming a transparent conductive film 4 on the support plate 3. The transparent conductive film 4 formed on the cover panel 1 and the support plate 3 can be adhered by the adhesive 5 for image display devices of the present invention. In addition, the side of the support plate 3 on which the transparent conductive film 4 is not formed and the image display portion 2 can be adhered by the adhesive 5 of the present invention. Figure 1 shows an example of using the adhesive of the present invention in the adhesion of the cover panel 1 and the transparent conductive film 4, and the adhesion of the support plate 3 and the image display part 2. However, only one of them may be used. Adhesion of the situation uses the adhesive of the present invention.

2 is a schematic cross-sectional view showing an example of an FPD using the adhesive for image display devices of the present invention. The FPD 200 includes a panel 11 and an image display unit 12. The panel 11 and the image display portion 12 are adhered by the adhesive 5 for an image display device of the present invention.

[Adhesion method] In addition, the present invention provides a support for the panel and the image display part, the cover panel and the support plate with a transparent conductive film, the image display part and the transparent conductive film using the adhesive for the image display device of the present invention The bonding method of any combination of the boards. As long as it is this kind of bonding method, any combination of the panel and the image display part, the cover panel and the support plate with the transparent conductive film, the image display part and the support plate with the transparent conductive film can be reliably achieved. Together.

For example, in the case of manufacturing the FPD shown in FIG. 2, by directly applying the adhesive 5 of the present invention to the image display portion 12, bonding the image display portion 12 and the panel 11, and then irradiating ultraviolet rays to harden it, The image display portion 12 and the panel 11 are adhered. In addition, the adhesive 5 of the present invention may be formed into a sheet in advance, and the sheet obtained in this manner may be attached to the image display portion 12 or the panel 11.

In addition, in the present invention, the adhesion method preferably includes both the curing step of the adhesive by UV irradiation and the curing step of the adhesive by heating. In this case, it is preferable to perform the curing step of the adhesive by heating after the curing step of the adhesive by UV irradiation.

According to this adhesion method, dark parts that are not irradiated with light can be cured by heating, so the panel and the image display part, the cover panel and the support plate with a transparent conductive film, the image display part and the Bonding of any combination of the support plates of the transparent conductive film.

In particular, if the curing step of the adhesive by heating is performed after the curing step of the adhesive by UV irradiation, the first UV irradiation can ensure that the panel and the image display unit, the cover panel, and the Any combination of a support plate with a transparent conductive film, an image display part, and a support plate with a transparent conductive film is bonded together, and the second heating is cured, except for the heating of the dark part that is not irradiated with light In addition to curing, the part irradiated with ultraviolet rays will be further heated and cured a second time, so the above-mentioned bonding will become more complete. Moreover, by the first ultraviolet irradiation, the curing of the adhesive is already in progress, so even if the second heat curing is not at a high temperature (for example, heating at a low temperature below 100°C), it can be The dark part of the light does harden. Thereby, it is possible to more reliably prevent thermal degradation of various members (base materials, etc.) used in the image display device.

That is, the adhesive for image display devices of the present invention is a suitable composition in terms of physical properties, and has excellent dark part hardenability. Therefore, even if there is a place where light is not irradiated depending on the structure of the module, there is no concern that an unhardened part will occur.

In addition, in the present invention, in the above-mentioned adhesion method, the temperature in the step of curing the adhesive by heating is preferably 90°C or less.

If this kind of adhesion method is used, low-temperature heating can harden the dark parts that are not irradiated with light, and it can also prevent the thermal deterioration of various components (base materials, etc.) used in the image display device, so that the panel can be further reliably achieved It is bonded to any combination of the image display part, the protective cover panel and the support plate with the transparent conductive film, and the image display part and the support plate with the transparent conductive film. [Example]

Examples and comparative examples are disclosed below to more specifically illustrate the present invention, but the present invention is not limited by the following examples.

[Examples 1 to 6, Comparative Examples 1 to 5] The following (A-1) component, (A-2) component, (B) component, (C-1) component, (C-2) component, ( C-3) Components and modifier components, to prepare polysiloxane compositions having the compositions shown in Table 1 (values are parts by mass). The obtained composition was irradiated with ultraviolet rays (500 mJ/cm ² ) three times with a high-pressure mercury lamp in a nitrogen atmosphere using a conveyor belt-type UV irradiation device manufactured by Japan Battery Corporation to obtain a cured product having a thickness of 2 mm. The hardness and light transmittance of the cured product were evaluated according to the following methods, and the results are shown in Table 2.

Hardness: According to the provisions of ASTM D 2240, Teclock Co., Ltd.'s hardness tester Shaoer OO type hardness tester, in accordance with JIS 6249, is measured by Shimadzu Corporation's type A hardness tester.

Light transmittance: The light transmittance of the prepared sample of the cured product was measured using a spectrophotometer (U-3310 manufactured by Hitachi, Ltd.) at a wavelength of 400 nm and set as an initial value. Next, the light transmittance of the sample after being treated for 1,000 hours in a state of being exposed to the dryer at 150°C was measured.

In addition, about the obtained composition, the adhesiveness to glass was evaluated by the following method, and the result is shown in Table 2.

Adhesion to glass; coating the composition of the embodiment and the comparative example in a frame surrounded by a heat-resistant tape (thickness 80μm) on a glass plate and make the coating area 20mm×25mm, and use another glass plate to The composition was sandwiched, and in this state, it was cured under the above-mentioned ultraviolet irradiation conditions, and evaluated by ○: adhesion and ×: non-adhesion.

In addition, for the obtained composition, the dark part hardenability (heat hardenability) and storage stability were evaluated by the following methods, and the results are shown in Table 2.

UV curability/dark part curability: Fill the above composition in an aluminum dish to make the thickness 6mm, and perform nitrogen substitution and UV irradiation with half of the area shielded from light. The case where the deep part curability reaches 6mm is regarded as ○. The case of curing was designated as ×, and the UV curing properties were evaluated. In addition, the aforementioned aluminum pan was placed in a dryer at 80°C for 1 hour to heat and harden, and the case where the dark part was hardened was rated as ○, and the case where there was no hardening was rated as ×, and the dark part hardenability was evaluated.

Storage stability: After storing the above composition in a light-shielding container and allowing it to stand at 25°C for 1 week, the case of maintaining a liquid state was rated as ○, and the case of colloidization was rated as x.

[(A-1) Ingredients] An organopolysiloxane with a viscosity of 3,000 mPa･s at 25°C expressed by the following average molecular formula

(式中，括弧內的矽氧烷單元的排列順序為任意。)

(In the formula, the order of the siloxane units in parentheses is arbitrary.)

[(A-2) Component] It is formed by the following MA unit (SiO _1/2 ), M unit (SiO _1/2 ) and Q unit (SiO _4/2 ). The molar ratio of these units is MA: M : Q=1:4:5, and an organopolysiloxane with a weight average molecular weight of 5,000 converted from polystyrene

[(B) Ingredient] 2,2-diethoxyacetophenone (DEAP)

[(C-1) Ingredients] Bis(4-hepta-butylcyclohexyl) peroxydicarbonate (manufactured by NOF Corporation, PEROYL TCP: T1=57.5℃)

[(C-2) Ingredients] 1,1-Di(tertiary butylperoxy)cyclohexane (manufactured by NOF Corporation, PERHEXA C: T1=111.1°C)

[(C-3) Ingredients] Diisobutyl peroxide (manufactured by NOF Corporation, PEROYL IB: T1=49.7°C)

[(C-4) Ingredients] Cumyl peroxyneodecanoate (manufactured by NOF Corporation, PERCUMYL ND: T1=55.0℃)

[(C-5) Ingredients] Diphenylmethyl peroxide (manufactured by NOF Corporation, NYPER BW: T1=92.0℃)

[(C-6) Ingredients] 1,1-Di(tert-butylperoxy)-2-methylcyclohexane (manufactured by NOF Corporation, PERHEXA MC: T1=102.4°C)

[Modifier] 3-methacryloxypropyl trimethoxysilane

As shown in Table 2, the composition of the present invention (compositions of Examples 1 to 6) can produce cured products with high transparency, excellent heat resistance and adhesion, UV curability, dark area curability, and storage stability. Good and suitable as an adhesive for image display devices. On the other hand, Comparative Example 1 without the component (C) or Comparative Examples 3 and 5 with (C-2) or (C-6) added instead of (C-1), although exposed at 80°C It is still in an uncured state even after hours. In addition, Comparative Example 2 in which (C-1) was excessively added or Comparative Example 4 in which (C-3) was added in place of (C-1) had poor storage stability, and gelatinization occurred when stored at 25°C for 1 week.

It is clear from the above results that the composition of the present invention has properties suitable as an adhesive for image display devices, and can be cured by heating at a low temperature of 90°C or less even in a dark part that is not irradiated with light. This is because the effect of containing a peroxide having a decomposition half-life temperature of 50°C to 100°C for 1 hour as the component (C) shows the usefulness of the present invention.

It is clear from the above that the ultraviolet curable liquid organopolysiloxane composition for image display devices of the present invention produces a cured product with high transparency and excellent adhesion to the substrate, and does not irradiate the dark part of light. It can also be hardened by heating. In addition, it has good durability at high temperatures, and is useful, for example, as a composition for FPDs and curved panel displays, especially for capacitive touch panels. In addition, since it is not corrosive to transparent conductive films such as ITO, is flexible, and has excellent step compliance, it is suitable for use as adhesives, sealants, and adhesive sheets for image display devices.

In addition, the present invention is not limited by the above-mentioned embodiment. The above-mentioned embodiment is an example, and any invention which has substantially the same structure as the technical idea described in the scope of the patent application of the present invention and exerts the same effects is included in the technical scope of the present invention.

1: Cover panel 2,12: Video display section 3: Support board 4: Transparent conductive film 5: Adhesives for image display devices 11: Panel 100: Touch panel 200: FPD

Fig. 1 is a schematic cross-sectional view showing an example of a touch panel using the adhesive for image display devices of the present invention. Fig. 2 is a schematic cross-sectional view showing an example of FPD using the adhesive for image display devices of the present invention.

1: Cover panel

2: Image display section

3: Support board

4: Transparent conductive film

5: Adhesives for image display devices

100: Touch panel

Claims (10)

An ultraviolet-curable liquid organopolysiloxane composition for image display devices, characterized by containing: (A) The mass ratio (A-1) of the following (A-1) and (A-2): (A) -2) Organopolysiloxane or its mixture in the range of 100:0-50:50: 100 parts by mass; (A-1) There are at least two structures represented by the following general formula (1) in the molecule The linear organopolysiloxane (A-2) has at least one branched organopolysiloxane represented by the following general formula (1) in the molecule

[In the formula, m is an integer of 0, 1, or 2, R ¹ is a hydrogen atom, a phenyl group or a halophenyl group, R ² is a hydrogen atom or a methyl group, and R ³ is the same or different carbon atoms from 1 to one 10 monovalent organic group, Z ¹ by -R ⁴ -, - R ⁴ O- or -R ⁴ SiR ³ ₂ O- (where, R ³ as described above, R ⁴ may be the same as or different from the carbon A divalent organic group with 1 to 10 atoms), Z ² is an oxygen atom or a divalent organic group with 1 to 10 carbon atoms that may be the same or different] (B) Photopolymerization initiator : 0.01-10 parts by mass; (C) Peroxide with a decomposition half-life temperature of 50°C to 100°C in 1 hour: 0.01-5 parts by mass. For example, the ultraviolet curable liquid organopolysiloxane composition for image display devices of claim 1, wherein in the aforementioned general formula (1), Z ¹ is a divalent organic group represented by -R ⁴ -, and Z ² Is an oxygen atom. For example, the ultraviolet curable liquid organopolysiloxane composition for image display devices of claim 1, wherein in the aforementioned general formula (1), Z ^{1 is} composed of -R ⁴ O- or -R ⁴ SiR ³ ₂ O- As for the divalent group represented, Z ² is a divalent organic group having 1 to 10 carbon atoms which may be the same or different. An adhesive for an image display device, which is characterized by containing the ultraviolet curable liquid organopolysiloxane composition for an image display device according to any one of claims 1 to 3. An image display device, which is characterized in that: a panel and an image display portion are bonded with an adhesive for an image display device as in claim 4. An image display device, characterized in that: at least any one of a support plate having a transparent conductive film and an image display portion, and a cover panel and the aforementioned support plate are combined using an adhesive for an image display device as in claim 4 fit. An adhesive method, characterized in that: using the adhesive for image display devices as in claim 4, the panel and the image display part, the cover panel and the support plate with a transparent conductive film, the image display part and the transparent conductive film Any combination of the supporting plates is attached. The adhesive method of claim 7, which includes both the curing step of the adhesive by UV irradiation and the curing step of the adhesive by heating. According to the adhesive method of claim 8, after the curing step of the adhesive by UV irradiation, the curing step of the adhesive by heating is performed. The adhesive method of claim 8 or 9, wherein the temperature in the curing step of the adhesive by heating is 90°C or less.

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