JP2008303228A - Adhesive for optical functional member-integrated type display device, adhesive film, adhesive film laminate and optical functional member-integrated type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive capable of providing an adhesive layer having excellent transparency, adhesiveness and durability, when used as an adhesive for directly sticking an optical functional member such as a glass subjected to antireflective treatment to a display part, hardly causing bubbles between a panel and the optical functional member, and having not only excellent followingness to an adherend but also excellent air-removability and operability. <P>SOLUTION: The adhesive for the optical functional member-integrated type display device is obtained by photocuring an adhesive composition for sticking the optical functional member to the display part. The adhesive composition contains a base polymer and a photopolymerization initiator as essential components, and the adhesive has 200,000-400,000 Pa storage elastic modulus at 46.4 Hz frequency, and 20,000-50,000 Pa storage elastic modulus at 0.01 Hz frequency. The adhesive film and the adhesive film laminate are formed by the adhesive. The optical functional member-integrated type display device is obtained by using the adhesive or the adhesive film. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light-transmitting full-surface plate for impact resistance, used as a light-transmitting member, an antireflection film, an antireflection glass, an antistatic glass, an antistatic film, an electromagnetic shielding material, and a near infrared absorbing film. In an optical function member-integrated display device having a structure in which an optical function member such as a color filter and a display unit such as electronic paper or LCD (liquid crystal) are integrated, adhesion for bonding the optical function member and the display unit The present invention relates to an adhesive, an adhesive film, an adhesive film laminate, and an optical function member integrated display device obtained by using the adhesive or the adhesive film.

  Recently, an optical function member such as an antireflection treatment film, an antireflection treatment glass, an antistatic glass, an antistatic film, an electromagnetic wave shielding material, a near-infrared absorbing film, a color filter, and a display portion such as a CRT or LCD are integrated. The optical function member integrated display device having a structure has been widely used in bank ATMs and CDs, station ticket machines, portable information terminals, mobile phones, personal computers, and the like.

  Although this optical functional member integrated display device is not particularly illustrated, a spacer is usually interposed between an optical functional member such as antireflection glass and a display unit such as an LCD, and the optical functional member. A constant gap of about 0.4 mm is provided between the display unit and the display unit. This is because when the optical functional member and the display unit are brought into direct contact, pressure is directly applied to the display unit, and the screen is blurred. Particularly, when the display unit is an LCD, blurring occurs remarkably due to distortion of the liquid crystal layer. Prevention of bleeding is essential.

  However, if there is a gap between the optical functional member and the display unit in this way, reflection and scattering of light occur and the contrast important as a display is reduced to about 1/2, and the visibility is reduced. Problems such as parallax feeling at the time of input and display shadows occur.

  For this reason, it is desired to directly bond the optical function member and the display unit so as not to provide a gap. In this case, when an epoxy resin adhesive known as an adhesive is used, since the adhesive layer is hard, when the optical function member is pressed, the pressing force is directly transmitted to the display unit as it is, causing bleeding. Cheap. Further, an epoxy resin adhesive or the like is inferior in wettability, and it is difficult to obtain a uniform adhesive layer.

  Therefore, as a technique for solving the above problems, an adhesive described in Japanese Patent Laid-Open No. 2001-19925 has been proposed. That is, this adhesive has appropriate elasticity or buffering properties when the optical functional member such as antireflection treated glass and the display unit are directly bonded, and has good display properties, transparency, adhesion, durability. Excellent in properties.

  However, conventional adhesives or pressure-sensitive adhesives including the above-mentioned proposed adhesives are laminated with a thick film pressure-sensitive adhesive or the like to fill the gap between the optical function member and the panel. For example, the panel and the optical function member are bonded using a roll type laminating apparatus such as a polarizing plate bonding apparatus.

  However, in the conventional technology, after the panel and the optical function member are bonded together via an adhesive or the like, bubbles may remain even after lamination due to minute thickness unevenness of the adhesive or the optical function member. Further, problems such as exacerbation of workability such as oozing out have occurred by simply adding a plasticizer or the like for plasticization.

JP 2001-19925 A

  The present invention has been made in view of the above circumstances, and when an optical function member such as an antireflection treatment glass and a display unit are directly joined, the display unit has appropriate elasticity or buffering properties, and is an optical function member integrated display device. Provides good display properties, can form an adhesive layer with excellent transparency, adhesion, and durability, and does not generate bubbles between the panel and the optical function member, and can follow the adherend. , An adhesive for an optical functional member-integrated display device excellent in workability and air detachability for bonding a panel and an optical functional member, an adhesive film formed with the adhesive, and an adhesive film laminate And an optical functional member integrated display device.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a cured product obtained by photocuring an adhesive composition containing a base polymer and a photoinitiator as essential components has a frequency of 46. When a cured product satisfying the storage elastic modulus at 4 Hz of 200000 to 400000 Pa and the storage elastic modulus of 20000 to 50000 Pa at a frequency of 0.01 Hz is used as an adhesive for bonding the optical function member and the display unit, the adhesive film The present inventors have found that it is possible to prevent exudation during production, facilitate degassing during lamination, and reliably perform air bleeding.

  That is, the present invention is constituted by the knowledge that the adhesive film having the elastic modulus in the specific range described above is excellent in air bleedability and workability. It is thought that it originates in the crosslinked structure of the polymer obtained by photocuring the adhesive composition which uses as a raw material. Although the details of this cross-linked structure are not clear, it is considered that the cross-linked structure has an appropriate cross-link density in order to achieve the desired elastic modulus.

Accordingly, the present invention provides the following optical functional member integrated display adhesive, adhesive film, adhesive film laminate, and optical functional member integrated display device.
[1] An adhesive obtained by photocuring an adhesive composition for bonding the optical function member and the display unit of the optical function member integrated display device in which the optical function member and the display unit are integrated, The adhesive composition contains a base polymer and a photoinitiator as essential components, and the storage elastic modulus at a frequency of 46.4 Hz is 200000 to 400000 Pa, and the storage elastic modulus at a frequency of 0.01 Hz is 20000 to 50000 Pa. An adhesive for a display device integrated with an optical functional member.
[2] The adhesive for an optical functional member integrated display device according to claim 1, wherein the ratio of the storage elastic modulus at a frequency of 46.4 Hz to the storage elastic modulus at a frequency of 0.01 Hz is 10 or less.
[3] The adhesive for an optical functional member-integrated display device according to claim 1 or 2, wherein in the adhesive composition, a raw material monomer of the polymer is diluted in the base polymer.
[4] The adhesive for an optical functional member-integrated display device according to claim 2, wherein in the adhesive composition, a mixing ratio (mass ratio) of the base polymer and the raw material monomer is 10/90 to 60/40. .
[5] The adhesive for an optical functional member-integrated display device according to any one of claims 1 to 4, wherein the base polymer is an acrylate-based and / or methacrylate-based polymer in the adhesive composition.
[6] The optical functional member according to any one of claims 3 to 5, wherein 0.1 to 10 parts by mass of a photoinitiator is added to 100 parts by mass of the base polymer in the adhesive composition. Adhesive for body type display devices.
[7] The optical function member integrated type according to any one of [2] to [6], wherein 0.1 to 50 parts by mass of a plasticizer is added to 100 parts by mass of the base polymer in the adhesive composition. Adhesive for display devices.
[8] The optical functional member is selected from an antireflection-treated glass, an antireflection-treated film, an antistatic glass, an antistatic film, an electromagnetic shielding material, a near-infrared absorbing film, and a color filter. The adhesive composition according to any one of the preceding claims.
[9] An adhesive film for an optical functional member-integrated display device, wherein the adhesive according to any one of claims 1 to 8 is formed into a film.
[10] An optical function comprising: the adhesive film for an optical functional member-integrated display device according to claim 9; and a release sheet that is detachably attached to one or both sides of the film. Adhesive film laminate for member-integrated display device.
[11] An optical function member integrated display device, wherein the optical function member and the display unit are laminated via the adhesive layer according to any one of claims 1 to 10.

  According to the optical functional member-integrated display adhesive of the present invention, when used as an adhesive for directly bonding an optical functional member such as antireflection glass and a display portion, it is excellent in transparency, adhesiveness, and durability. In addition, air bubbles are not generated between the panel and the optical functional member, and the followability with the adherend is excellent, and the air escape property and workability are excellent. The adhesive film, the adhesive film laminate, and the optical function member integrated display device of the present invention having the adhesive as a constituent element have the same effects as described above.

  The adhesive for display with an integrated optical function member of the present invention has a storage elastic modulus at 25 ° C. within the following range, thereby preventing bleeding when producing a film, and being capable of following a substrate at the time of bonding. And the generation of bubbles and voids can be prevented.

  The storage elastic modulus (high-frequency elastic modulus) at a frequency of 46.4 Hz affects the followability of the adhesive to the substrate. The storage elastic modulus is 200,000 to 400,000 Pa, preferably 300,000 to 400,000 Pa. When it exceeds 400,000 Pa, the followability to the substrate becomes insufficient, and there is a possibility that voids and bubbles are generated. On the other hand, if it is less than 200000 Pa, the followability at the time of transfer is too high, and bleeding may occur.

  Moreover, the storage elastic modulus (low frequency elastic modulus) at a frequency of 0.01 Hz affects the production of the adhesive film. That is, the low frequency is a viscous physical property and is considered to have a correlation with the bleeding of the adhesive. The storage elastic modulus is 20000 to 50000 Pa, preferably 30000 to 50000 Pa. When it exceeds 50000 Pa, tackiness is lost and the adhesion to the substrate is deteriorated, and workability may be deteriorated. On the other hand, if the storage elastic modulus is less than 20000 Pa, bleeding may occur during film production.

  In the present invention, the ratio between the storage elastic modulus (high frequency elastic modulus) at the frequency of 46.4 Hz and the storage elastic modulus (low frequency elastic modulus) at the frequency of 0.01 Hz balances the air release property and workability. From the standpoint, it is preferably 10 or less, more preferably 8 or less. If it deviates from the above range, seepage may occur during work, and voids or bubbles may occur.

  As the raw material for the adhesive, known materials can be used as the adhesive for the optical functional member. From the viewpoint of adjusting the storage elastic modulus to the above range, the raw material polymer is diluted with the raw material monomer of the polymer. It is preferable to use a mixture of The reason is that it is possible to form a film having a thickness of 100 μm or more, which was difficult in a solvent system, by employing a wet lamination method and a UV irradiation film forming method.

  The mixing ratio (mass ratio) of the raw material polymer and the raw material monomer in the mixture is preferably 10/90 to 60/40, more preferably 20/80 to 50/50. When the amount of the raw material polymer is too large, the viscosity becomes too high and not only the workability is deteriorated but also the followability is deteriorated, and there is a possibility that voids and bubbles are generated during the lamination process. On the other hand, if the amount of the raw material polymer is too small, the viscosity becomes too low, causing bleeding and reducing workability.

  In addition, it is preferable that the number average molecular weight of the raw material polymer in the said mixture is usually 20000-300000, More preferably, it is 50000-200000. Moreover, it is preferable that the viscosity of the said mixture is 0.5-4 Pa.s, More preferably, it is 0.8-2 Pa.s.

  Here, the base polymer which is the main component of the adhesive used in the present invention is not particularly limited, but for example, acrylic resin, polyvinyl acetate, vinyl acetate / (meth) acrylate copolymer, ethylene / vinyl acetate copolymer. Polymer, polystyrene and copolymer thereof, polyvinyl chloride and copolymer thereof, butadiene / acrylonitrile copolymer, acrylonitrile / butadiene / styrene copolymer, methacrylate / acrylonitrile / butadiene / styrene copolymer, 2-chlorobutadiene -1,3-polymer, chlorinated rubber, styrene / butadiene / styrene copolymer, styrene / isoprene / styrene block copolymer, epoxy resin, polyamide, polyester, polyurethane, cellulose ester, cellulose ether, polycarbonate, poly It can be mentioned acetal or the like. In particular, from the viewpoint of solubility in acrylic monomers, the base polymer is preferably an acrylate-based and / or methacrylate-based polymer. Moreover, when using an acrylate type and / or a methacrylate type polymer, it is preferable to contain the repeating unit of methyl methacrylate at least 50 mass% (especially 60-90 mass%).

  When the base polymer used in the present invention is an acrylate-based and / or methacrylate-based polymer, it is preferable to use a mixture diluted with an acrylic monomer. That is, it is possible to produce a polymer / monomer mixture (for example, trade name “Syrup” manufactured by Soken Chemical Co., Ltd.) produced by stopping the acrylic polymer synthesis process. Further, by using such a mixture, it is possible to make the solution solvent-free.

  Moreover, a well-known photoinitiator can be used as a photoinitiator. Examples of such photopolymerization initiators include benzoin series such as acetophenone series and benzyldimethyl ketal, thioxanthone series such as benzophenone series, isopropylthioxanthone and 2-4-diethylthioxanthone, and other special ones such as methylphenylglycol. Oxylate etc. can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may contain one or two or more kinds of known and commonly used photopolymerization accelerators such as benzoic acid-based or tertiary amine-based compounds such as 4-dimethylaminobenzoic acid, if necessary. Can be mixed and used.

  In the present invention, the blending amount of the photopolymerization initiator is important. That is, by reducing the blending amount of the usual photopolymerization initiator, the crosslink density is reduced to obtain a desired elastic modulus. Specifically, it is preferable to set it as 0.01-1.0 mass part with respect to 100 mass parts of said base polymers, especially 0.05-0.3 mass part.

  Examples of the acetophenone-based polymerization initiator include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 4-t-butyl-trichloroacetophenone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenyl. Propan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, etc. Benzophenone polymerization initiators include benzophenone, Benzoyl benzoate, benzoyl benzoic acid methyl, 4-phenyl benzophenone, hydroxybenzophenone, 4-Benzzoiru 4'-methyl diphenyl sulfide, 3,3'-dimethyl-4-methoxybenzophenone and the like can be used.

  Examples of the acetophenone polymerization initiator include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl)- 2-morpholinopropane-1 is preferred. As the benzophenone polymerization initiator, benzophenone, benzoylbenzoic acid, and methyl benzoylbenzoate are preferable. Tertiary amine photopolymerization accelerators include triethanolamine, methyldiethanolamine, triisopropanolamine, 4,4'-dimethylaminobenzophenone, 4,4'-diethylaminobenzophenone, ethyl 2-dimethylaminobenzoate. , Ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate and the like can be used. Particularly preferably, examples of the photopolymerization accelerator include ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate, and the like. Is mentioned.

  In addition to the base polymer and the photoinitiator, a known additive can be added to the adhesive composition. For example, a silane coupling agent can be added to promote adhesion. Specific examples of the silane coupling agent include vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, and γ-glycidoxypropyltrimethoxysilane. , Γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltri Examples include ethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, and the like. One of these can be used alone, or two or more can be used in combination. The addition amount of these silane coupling agents is usually 0.01 to 5 parts by mass with respect to 100 parts by mass of the base polymer.

  Moreover, an epoxy group-containing compound can also be added for the purpose of improving adhesiveness. Examples of the epoxy group-containing compound include triglycidyl tris (2-hydroxyethyl) isocyanurate, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, acrylic glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, Examples thereof include phenol glycidyl ether, pt-butylphenyl glycidyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, glycidyl methacrylate, butyl glycidyl ether, and the like. be able to. The addition amount of these epoxy group-containing compounds is usually 0.1 to 20 parts by mass with respect to 100 parts by mass of the base polymer.

  Furthermore, as another additive, a hydrocarbon resin can be added for the purpose of improving processability such as processability and bonding. In this case, the added hydrocarbon resin may be either a natural resin type or a synthetic resin type. As the natural resin system, rosin, rosin derivatives, and terpene resins are preferably used. As the rosin, gum resin, tall oil resin, and wood resin can be used. As the rosin derivative, rosin obtained by hydrogenation, heterogeneity, polymerization, esterification, or metal chloride can be used. As the terpene resin, terpene phenol resins can be used in addition to terpene resins such as α-pinene and β-pinene. In addition, dammar, corbal and shellac may be used as other natural resins. On the other hand, in the synthetic resin system, petroleum resin, phenol resin, and xylene resin are preferably used. As the petroleum resin, aliphatic petroleum resin, aromatic petroleum resin, alicyclic petroleum resin, copolymer petroleum resin, hydrogenated petroleum resin, pure monomer petroleum resin, and coumarone indene resin can be used. As the phenol resin, an alkyl phenol resin or a modified phenol resin can be used. As the xylene-based resin, a xylene resin or a modified xylene resin can be used.

  Although the addition amount of the said hydrocarbon resin etc. is selected suitably, 1-200 mass parts is preferable with respect to 100 mass parts of said base polymers, More preferably, it is 5-150 mass parts.

  Furthermore, in the present invention, an ultraviolet absorber, an antiaging agent, a dye, a processing aid and the like can be appropriately added as necessary.

  The adhesive of the present invention can be formed into a film by a film forming method such as calendering, roll, T-die extrusion, and inflation. In this case, the thickness of the film to be formed is appropriately selected, but is usually 50 to 1000 μm, particularly preferably 50 to 500 μm.

Moreover, in this invention, it is possible to apply | coat an adhesive composition using various laminating apparatuses by a wet laminating system etc., and to obtain an adhesive by photocuring. The wet laminating method is that the adhesive composition is applied to the base film, and before the adhesive is dried, it is bonded to another base film base using a pressure roll, etc. This is a solvent-free method in which the coating liquid is cured to form a film. In the present invention, the adhesive composition is photocured by irradiating weak light of about 1 to 10 mW / cm ² using a black light or the like in a state in which two base films are bonded to each other. A laminated film can be obtained through this. These are wound up by a winding roller. Specifically, as shown in FIG. 1, a coating mechanism may be mentioned. Reference numerals 11 and 12 are base film, 20 is a winding roller, 30 is a wet laminating roller, 40 is a wet laminating, and 50 is Light irradiation, 60 is a winding roller.

  Moreover, as a light source used when photocuring an adhesive composition, many things which light-emit in an ultraviolet-visible region are employable. Examples thereof include ultra-high pressure, high pressure, low pressure mercury lamp, chemical lamp, xenon lamp, halogen lamp, Mercury halogen lamp, carbon arc lamp, incandescent lamp, laser light and the like. The irradiation time cannot be determined unconditionally depending on the type of lamp and the intensity of the light source, but it is about several tens of seconds to several tens of minutes.

  In the present invention, by the above method, a high-molecular polymer having a desired storage elastic modulus and crosslinking density at high and low frequencies is produced, and the characteristics are also good.

  In this invention, the said adhesive film can be made into the laminated body which comprises the peeling sheet on the surface. That is, by sticking a release sheet on one side or both sides of the adhesive film so as to be peelable, the adhesiveness is maintained before use, and contamination such as adhesion of dust can be avoided, and handling property is improved during use. As a result, the laminating operation can be performed smoothly. In this case, examples of the release sheet include polyethylene terephthalate (PET), polyethylene (PE), and polypropylene (PP) as main materials, and particularly preferably PET.

  Next, the optical function member integrated display device of the present invention is such that an adhesive layer is formed by the adhesive or adhesive film of the present invention, and as shown in FIG. The film-like adhesive 10 is interposed between the two and cured.

  Here, the optical functional member 1 of the present invention may be a known one, for example, a light transmissive antireflection treatment glass, an antireflection treatment film, an antistatic glass, an antistatic film, an electromagnetic shielding material, Infrared absorbing films, color filters, and the like can be suitably used. As the display unit 2, a known configuration such as a CRT or LCD can be used.

  As a method for adhering the adhesive, for example, a laminate formed by adhering a release sheet (not shown in particular) to both sides of the adhesive film 10 is used. As a method of bonding the LCD panel 2 and the optical function member 1 using this laminate, a known method can be employed. Particularly preferably, as shown in FIG. 3 (A), the laminated body in which the adhesive film 10 is bonded to the front plate 1a of the optical function member 1 is held by the lower stage 21 by suction and suction, and the LCD panel 2 Is held on the reversing stage 22 by suction suction. Then, as shown in FIGS. 3B and 3C, the LCD panel 2 and the front plate 1 a of the optical function member 1 are bonded together via the adhesive film 10 by inverting the inverting stage 22. Can do.

  Although not particularly shown after the above bonding, a heating and pressing apparatus such as an autoclave can be used as a separate process. For example, it can be heated and pressurized by an autoclave under the conditions of 60 ° C., 0.5 Mpa and 60 minutes. In the present invention, when a heating and pressurizing device such as an autoclave is used, bubbles between the film and the member are clearly eliminated.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not restrict | limited to the following Example. In addition, in the following example, a part and% show a mass part and mass%.

[Examples 1 to 7, Comparative Examples 1 and 2]
Adhesive compositions of Examples and Comparative Examples were prepared according to the formulation shown in Table 1 below. The adhesive composition was applied using a polarizing plate laminator (see FIG. 1). That is, the adhesive composition was applied to a film and laminated by a wet lamination method. The coating conditions are a speed of 0.2 m / min and a roll diameter of φ140 mm. During the coating, the adhesive composition on the film was photocured by UV irradiation to obtain a cured product. The irradiation length is 80 cm.

In addition, the trade names of main materials described in Table 1 are as follows.
・ “Acrylic base polymer” Acrylic adhesive made by mixing acrylic polymer and monomer, manufactured by Soken Chemical Co., Ltd. ・ Photoinitiator, product name “P-02” manufactured by Soken Chemical Co., Ltd. ・ Acryloxy group-containing compound 1 ・ ・-Product name “SR-238F” manufactured by Sartomer 1,6-hexanediol diacrylate (average molecular weight Mw226)
-Acryloxy group-containing compound 2 ... Product name "HOA" 2-hydroxyethyl acrylate (average molecular weight Mw116) manufactured by Kyoeisha Chemical Co.
-Acryloxy group-containing compound 3 ... Product name "130A" Kyoeisha Chemical Co., Ltd. methoxy polyethylene glycol acrylate (average molecular weight Mw482)

The evaluation tests of Table 2 and Table 3 are as follows.
It measured by the storage elastic modulus "HAAKE" viscoelasticity apparatus (RS300) in 23 degreeC distortion 1.0% and the range of frequency 0.01-46.4Hz. Sample φ8.0mm, measured with a parallel plate. Thickness 400 μm.

The frequency of that air leakage was visually observed and laminated with the air escaping ability deflection plate lamination apparatus.
The mixture was autoclaved at 60 ° C. and 0.6 Mpa, allowed to stand at room temperature for 1 week, and then evaluated according to the following criteria.
○ ... There is no air.
X: Air of φ0.3 or more was generated.

When laminating the front plate / adhesive roll of the workability display section, the surface of the roll was visually observed and evaluated according to the following criteria.
○ ・ ・ ・ No contamination on roll × ・ ・ ・ Contamination on roll

In Comparative Example 1, since an adhesive having a storage elastic modulus at a frequency of 46.4 Hz exceeding 400000 Pa is used, the air release property is poor and the workability is also poor.
In Comparative Example 2, since an adhesive having a storage elastic modulus at a frequency of 46.4 Hz exceeding 400000 Pa is used, the air release property is poor and the workability is also poor.

It is the schematic which showed an example of the method of apply | coating an adhesive composition to a base film in order to obtain the adhesive agent of this invention. It is sectional drawing which shows one Example of the optical function member integrated display device of this invention. It is the schematic which showed an example of the mechanism which bonds the optical function member and display part in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical function member 2 Display part 10 Adhesive

Claims (11)

  An adhesive obtained by photocuring an adhesive composition for bonding the optical function member and the display unit of the optical function member integrated display device in which the optical function member and the display unit are integrated, the adhesive composition The product contains a base polymer and a photoinitiator as essential components, and has a storage elastic modulus at a frequency of 46.4 Hz of 200000 to 400000 Pa and a storage elastic modulus at a frequency of 0.01 Hz of 20000 to 50000 Pa. Adhesive for optical function member integrated display device.   The adhesive according to claim 1, wherein a ratio of a storage elastic modulus at a frequency of 46.4 Hz and a storage elastic modulus at a frequency of 0.01 Hz is 10 or less.   The adhesive according to claim 1 or 2, wherein a raw material monomer of the polymer is diluted in the base polymer in the adhesive composition.   The adhesive according to claim 2, wherein in the adhesive composition, a mixing ratio (mass ratio) of the base polymer and the raw material monomer is 10/90 to 60/40.   The adhesive according to any one of claims 1 to 4, wherein in the adhesive composition, the base polymer is an acrylate-based and / or methacrylate-based polymer.   The said adhesive composition WHEREIN: 0.1-10 mass parts of photoinitiators are added with respect to 100 mass parts of said base polymers, The adhesive agent of any one of Claims 3-5.   The said adhesive composition WHEREIN: The adhesive agent of any one of Claims 2-6 formed by adding 0.1-50 mass parts of plasticizers with respect to 100 mass parts of said base polymers.   The optical function member is selected from an antireflection glass, an antireflection film, an antistatic glass, an antistatic film, an electromagnetic wave shielding material, a near-infrared absorbing film, and a color filter. The adhesive according to item.   An adhesive film for an optical functional member-integrated display device, wherein the adhesive according to any one of claims 1 to 8 is formed into a film shape.   An optical functional member integrated type comprising the adhesive film for an optical functional member integrated display device according to claim 9 and a release sheet that is detachably attached to one or both sides of the film. Adhesive film laminate for display device.   An optical functional member-integrated display device, wherein the optical functional member and the display unit are laminated via the adhesive layer according to any one of claims 1 to 10.

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