JP2009109532A - Method for manufacturing optical functional member-integrated display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical functional member-integrated display device having excellent adhesiveness with an adherend and clearing an endurance test such as a thermal cycle test. <P>SOLUTION: The method for manufacturing an optical functional member-integrated display device comprising an optical functional member integrated with a display unit is characterized in that: an adhesive composition adhering the optical functional member with the display unit includes a source polymer, a photopolymerization initiator and an organic peroxide; and the adhesive composition is preliminarily cured with light to prepare an adhesive composition partially in a crosslinked state, then the optical functional member and the display unit are laminated with the adhesive composition therebetween, and subsequently, the adhesive composition is thermally cured by heat treatment. By the method of the present invention, an optical functional member-integrated display device having excellent adhesiveness with the adherend and clearing an endurance test such as a thermal cycle test can be manufactured, and thereby, the method is industrially advantageous. <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. The present invention relates to a method for manufacturing an optical functional member integrated display device having a structure in which an optical functional member such as a color filter and a display unit such as electronic paper or LCD (liquid crystal) are integrated.

  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.

  Lamination with an adhesive is performed in order to fill the gap between the optical function member and the display unit. In this case, in order to improve impact resistance and followability, it is desirable to laminate an adhesive layer as thick as possible. In conventional solvent dilution type adhesives, those having a solid content concentration as low as about 30% are used, and it is necessary to sufficiently dilute the solvent. In order to volatilize the solvent sufficiently, an adhesive of 50 μm or more is required. It was difficult to form a film.

  Therefore, a solvent-free film-forming system using an acrylic syrup obtained by dissolving an acrylic polymer in a low molecular weight acrylic monomer as a raw material has been found, and it has become possible to produce an adhesive having a thickness of about 500 μm. (See Japanese Patent Application No. 2007-148783 filed).

  However, in the prior art, the pressure-sensitive adhesive is completely cross-linked at the time of film formation, so that the adhesiveness with the adherend is lowered, and severe peeling has occurred in endurance tests such as heat shock.

JP 2001-26758 A Japanese Patent Laid-Open No. 2002-140014

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing an optical functional member integrated display device that has excellent adhesion to an adherend and has cleared a durability test such as a thermal cycle test. .

  As a result of intensive studies in order to solve the above problems, the inventors of the present invention have proposed to construct a material that crosslinks after the pressure-sensitive adhesive adheres to the adherend. That is, it has been found that the adhesive is more easily wetted before being cured by crosslinking after being in close contact with the adherend and less likely to be peeled off due to the throwing effect (anchor effect) after curing. is there

Accordingly, the present invention provides the following method for manufacturing an optical functional member integrated display device.
[1] In the method for manufacturing an optical function member integrated display device in which the optical function member and the display unit are integrated, the adhesive composition for bonding the optical function member and the display unit includes a raw material polymer, light A polymerization initiator and an organic peroxide are contained, and the adhesive composition is pre-cured to prepare a partially crosslinked adhesive composition, and then the optical composition is passed through the adhesive composition. A method for producing a display device integrated with an optical function member, wherein the functional member and the display unit are bonded together, and then the adhesive composition is thermally cured by heat treatment.
[2] The coating liquid containing the adhesive composition is applied to a release film, and another release film is bonded to the coated release film, and the coating liquid is photocured in this state. The manufacturing method as described.
[3] The production method according to claim 2, wherein the adhesive composition is applied by a wet laminating method.
[4] The method according to claim 2, wherein the coating liquid is a solvent-free system.
[5] The production method according to any one of claims 1 to 4, wherein UV irradiation is performed at a photocuring condition of the adhesive composition of 1 to 50 mW / cm ² and 100 to 5000 mJ / cm ² .
[6] The production method according to any one of claims 1 to 5, wherein the adhesive composition is heated at 50 to 140 ° C for 10 to 120 minutes.
[7] The production method according to any one of claims 1 to 6, wherein the photopolymerization initiator is added in an amount of 0.1 to 10 parts by mass with respect to 100 parts by mass of the raw material polymer.
[8] The production method according to any one of claims 1 to 7, wherein the organic peroxide is added in an amount of 0.1 to 10 parts by mass with respect to 100 parts by mass of the starting polymer.
[9] The production method according to any one of claims 1 to 8, wherein the raw material polymer is an acrylate-based and / or methacrylate-based polymer.
[10] The method according to any one of claims 1 to 9, wherein the film on which the adhesive composition is formed has a thickness of 10 to 3000 μm.
In the present invention, “partial crosslinking” refers to a state in which the degree of crosslinking is lower than the final desired crosslinking state.

  According to the production method of the present invention, it is possible to produce an optical functional member-integrated display device that is excellent in adhesion to an adherend and has cleared a durability test such as a thermal cycle test. Is the method.

  The method for producing an optical functional member integrated display device of the present invention uses an adhesive composition containing a raw material polymer, a photopolymerization initiator and an organic peroxide in order to integrate the optical functional member and the display unit. . First, the adhesive composition is photocured to produce a partially crosslinked adhesive composition, and then the optical functional member and the display unit are bonded together via the adhesive composition, An optical functional member-integrated display device having excellent adhesion and durability between the optical functional member and the display unit by thermally curing the adhesive composition by performing heat treatment under conditions to complete the crosslinking reaction Can be produced.

  The components of the adhesive composition will be described below.

  As the raw material for the adhesive composition, known adhesives for optical functional members can be used, and it is particularly preferable to use a mixture obtained by diluting a raw material polymer with a raw material monomer of the polymer. The reason is that a film thickness of 100 μm or more, which was difficult in a solvent system, can be formed by adopting a wet lamination method and a UV irradiation film forming method which will be described later.

  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 15/80 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, when the amount of the raw material polymer is too small, the viscosity becomes too low, and there is a possibility that the oozing occurs and the workability is lowered.

  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 0.5-30 Pa.s, More preferably, it is 3-20 Pa.s.

  Here, the raw material polymer is not particularly limited, but for example, acrylic resin, polyvinyl acetate, vinyl acetate / (meth) acrylate copolymer, ethylene / vinyl acetate copolymer, polystyrene and its copolymer, Vinyl chloride and its copolymer, 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, polyvinyl acetal, etc. . 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 raw material polymer is an acrylate-based and / or methacrylate-based polymer, it is preferable to use a mixture diluted with an acrylic monomer. A polymer / monomer mixture obtained by diluting an acrylic polymer with a monomer (for example, trade name “Syrup” manufactured by Soken Chemical Co., Ltd.) can be produced. Further, by using such a mixture, it is possible to make the solution solvent-free.

  Moreover, a photopolymerization initiator is blended as an essential component in the adhesive composition. A known photopolymerization initiator can be used as the type. Specific examples of the photopolymerization initiator 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 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 be optionally selected from one or more known photopolymerization accelerators such as benzoic acids such as 4-dimethylaminobenzoic acid or tertiary amines. It can be used by mixing at a ratio.

  About the compounding quantity of the said photoinitiator, in the case of this invention, it shall be 0.01-1.0 mass part with respect to 100 mass parts of said raw material polymers, especially 0.05-0.3 mass part. Is preferred.

  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, and the like As the benzophenone polymerization initiator, benzophenone, Nzoiru benzoate, methyl benzoyl benzoate, 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. Particularly preferably, as the photopolymerization accelerator, ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate, etc. Is mentioned.

  In the adhesive composition, an organic peroxide is blended as an essential component together with the photopolymerization initiator. Examples of the organic peroxide include 2,5-dimethylhexane-2,5-dihydroxyperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, di-t. -Butyl peroxide, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, dicumyl peroxide, α, α'-bis (t-butylperoxyisopropyl) ) Benzene; n-butyl-4,4-bis- (t-butylperoxy) valerate, 2,2-bis (t-butylperoxy) butane, 1,1-bis (t-butylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, t-butylperoxybenzoate, benzoyl peroxide, t-butyl Tilperoxyacetate, methyl ethyl ketone peroxide, t-butyl hydroperoxide, p-menthane hydroperoxide, hydroxyheptyl peroxide, chlorohexanone peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, cumyl peroxide Octoate, succinic acid peroxide, acetyl peroxide, t-butyl peroxide (2-ethylhexanoate), m-toluoyl peroxide, benzoyl peroxide, t-butyl peroxyisobutyrate, 2,4 -Dichlorobenzoyl peroxide etc. are mentioned, It can mix | blend suitably according to the required curing temperature, time, physical properties, etc.

  As the organic peroxide, one of these can be used alone or in admixture of two or more, and the addition amount is usually 0.1 to 10 parts by mass with respect to 100 parts by mass of the raw material polymer. In particular, 0.2 to 2.0 parts by mass is recommended. If the blending amount is small, curing sufficient for durability cannot be obtained, and if the blending amount is large, unreacted products and by-products after curing increase, which may deteriorate the performance.

  In addition to the raw material polymer, photopolymerization initiator and organic peroxide, the adhesive composition may contain known additives. 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, a terpene phenol resin can be used in addition to a terpene resin 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.

  In addition, in the said adhesive composition, a ultraviolet absorber, anti-aging agent, dye, a processing aid, etc. can be suitably added as needed.

  Next, the adhesive composition is used for the purpose of bonding adherends (optical functional member and display portion) to each other by curing. In the present invention, the manufacturing process is characterized. That is, the present invention includes both the step (1) of photocuring the adhesive composition and the step (2) of thermosetting the adhesive composition as essential requirements.

Process (1)
The adhesive composition contains a photopolymerization initiator, and the adhesive composition is photocured under predetermined conditions. The predetermined condition, 1~50mW / cm ^2, desirably from 3~10mW / cm ^2, also, 100~5000mJ / cm ^2, desirably 500~2000mJ / cm ^2.

  Moreover, as an aspect of the photocuring of the adhesive composition, for example, it can be formed into a film while photocuring the adhesive composition by a film forming method such as calendar, roll, T-die extrusion, and inflation. . In this case, the thickness of the film to be formed is appropriately selected, but is preferably 10 to 3000 μm, more preferably 50 to 1000 μm, and particularly preferably 50 to 500 μm.

  Moreover, it is possible to apply | coat an adhesive composition using various lamination apparatuses by a wet laminating system etc., and to obtain an adhesive composition by photocuring. The wet laminating method is to apply an adhesive composition on a release film and bond it with another release film using a pressure roll etc. before the adhesive composition is cured or gelled, and then photocured. This is a solventless method in which the coating liquid is cured by reaction or the like to form a film. Specifically, the coating mechanism shown in FIG. 1 (A) can be used, and the release film 12 is continuously sent out from the unwinding roller 20 in the direction of the arrow in the drawing, and the adhesive composition is supplied from the liquid dam 15. While being applied to one surface of the release film 12, another release film 11 is sent out from another unwinding roller 30, and both release films 12, 11 are bonded together by a wet laminip 40. In this way, the adhesive layer 10 having a predetermined thickness obtained by photocuring the adhesive composition can be laminated between the laminated films 11 and 12, and these are wound up by the winding roller 60.

  In the present invention, as described above, the coating liquid containing the adhesive composition is applied to the release film, and another release film is bonded to the coated film, and the coating liquid is photocured in this state. The method can be suitably employed.

In the present invention, as a light source for photocuring (reference numeral 70 in FIG. 1), many light emitting in the ultraviolet to visible region can be adopted. For example, ultra high pressure, high pressure, low pressure mercury lamp, chemical lamp, xenon lamp, halogen lamp, mercury lamp, black light, carbon arc lamp, incandescent lamp, laser light and the like can be mentioned. In particular, a lighting device such as a black light can be preferably used. The irradiation intensity depends on the composition and hardness of the adhesive composition to be used, but it is usually irradiated with relatively weak light of about 1 to 10 mW / cm ² , preferably 3 to 10 mW / cm ^2. At the same time, the irradiation time is not generally determined depending on the type of lamp and the intensity of the light source, but it can be set to several tens of seconds to several tens of minutes, preferably 30 seconds to 5 minutes. If the irradiation intensity and time are exceeded from the above ranges, the curing reaction of the adhesive composition as a subsequent step cannot be performed sufficiently and effectively, and the desired effect of the present invention may not be obtained.

The adhesive composition thus obtained has a partially crosslinked structure. The crosslinking conversion rate is 20 to 95%, preferably 30 to 90%. It is desirable that the crosslinking conversion rate can be made as low as possible and a film can be formed. Incidentally, the crosslinking conversion is, if the area of measuring the IR spectrum from 1,600 to 1,620 / cm a (C = C) area of S _1, and 1700-1720 / cm (-CO-) was S _2, UV The S _i / S _L measurement value of the coating liquid before irradiation is defined as the conversion rate 0, the S ₁ / S ₂ measurement value when UV irradiation and heating are excessively performed is defined as the conversion rate 100%, and S ₁ / S ₂ It is estimated to be a linear function and quantified by the measured conversion rate.

  The optical functional member-integrated display device of the present invention forms an adhesive layer made of the above-mentioned adhesive composition, interposes this between the optical functional member and the display portion, and further performs a crosslinking reaction by performing thermosetting. This is completed to obtain an optical functional member integrated display device.

  Here, the optical functional member may be a known one, for example, a light-transmissive antireflection glass, an antireflection film, an antistatic glass, an antistatic film, an electromagnetic wave shielding material, a near infrared absorbing film, A color filter or the like can be suitably used.

  On the other hand, as the display unit, a known one such as a CRT or LCD can be used.

Step (2)
Next, the process (2) of thermosetting the adhesive composition will be described. Using the above-described photocured adhesive composition, the optical functional member, which is an adherend, and the display unit are bonded and integrated. As these laminating methods, for example, release films 11 and 12 (laminated body) interposing the adhesive composition 10 shown in FIG. 1 (B) can be used, but are not limited thereto. Absent.

  Moreover, a well-known method can be employ | adopted as a method of adhere | attaching an LCD panel and an optical function member using this laminated body. Although not specifically illustrated, when the adhesive composition 10 is bonded to the front plate of the optical functional member, one release film is peeled off, and the release surface is bonded to the front plate, and the other release film is bonded. Bonding can be performed by peeling off from the adhesive composition 10. Specifically, as shown in FIG. 2 (A), the laminated body in which the adhesive composition 10 is bonded to the front plate 1a of the optical functional member 1 is held by the lower stage 21 by suction adsorption, and the LCD panel. 2 is held on the reversing stage 22 by suction suction. Then, as shown in FIGS. 2B and 2C, by reversing the reversing stage 22, the LCD panel 2 and the front plate 1 a of the optical function member 1 are bonded together via the adhesive composition 10. be able to.

  In the present invention, after the above bonding, heat treatment under a predetermined condition is performed, the thermosetting reaction is accelerated by the organic peroxide contained in the adhesive composition, the crosslinking reaction is completed, and a desired degree of crosslinking is achieved. An adhesive cured product having is obtained. When performing the thermosetting, a heating and pressing apparatus such as an autoclave or a heating press can be used as the heat treatment means (reference numeral 80 in FIG. 3). The heating temperature is preferably 50 ° C. or higher and 140 ° C. or lower and the heating time is 10 to 120 minutes. In this case, an increase in the conversion rate can be confirmed by measuring the crosslinking conversion rate by IR spectrum.

  Thus, in the present invention, both the step (1) of photocuring the adhesive composition and the step (2) of thermosetting the adhesive composition are included as essential requirements. Thus, the cured adhesive obtained by performing the cross-linking reaction over time in two stages has a very high bonding adhesion between the optical functional member and the display unit, which is unprecedented. Even in a changing environment, there is almost no peeling and high durability.

  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 5, 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. Regarding the coating conditions, Example 5 has a speed of 0.4 m / min, the other speed is 0.2 m / min, and the roll diameter is 140 mm.

The photocuring conditions during the coating are as follows.
Irradiation: UV irradiation Irradiation length: 60 cm
Irradiation device: Single side irradiation with black light (12)
Irradiation energy: 1500 mJ / cm ² · 83 mW / cm ²
Irradiation time: 3 minutes

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. ・ Organic peroxides, product name “Perroyl TCP” manufactured by Nippon Oil & Fats Co., Ltd. ・ Trimethylolpropane triacrylate, product name “TMP-A” manufactured by Kyoeisha Chemical Co., Ltd. (Average molecular weight Mw296)
-Acryloxy group-containing compound A ... Product name "HOA" 2-hydroxyethyl acrylate (average molecular weight Mw116) manufactured by Kyoeisha Chemical Co., Ltd.
-Acryloxy group-containing compound B ... Product name "130A", manufactured by Kyoeisha Chemical Co., Ltd. Methoxypolyethylene glycol acrylate (average molecular weight Mw482)

  The evaluation tests in Table 2 are as follows.

CURAST EVALUATION About the film-formed product (before thermosetting) after UV irradiation, the rising torque was evaluated by Curast Meter III (manufactured by JSR).
Rising torque: (Achieved torque after 60 minutes measurement)-(Lowest point)

Thermal cycle test (1) Sample preparation method Polycarbonate (4.0 mm) / Adhesion (250 μm) / Glass (0.7 mm)
Sample size: 110x220mm
Sample alignment conditions: Autoclave 60 ° C. × 0.5 MPa × 60 minutes (2) Cooling cycle conditions Exposure conditions: −10 ° C. × 24 hours (first stage)
23 ° C x 24 hours (second stage)
80 ° C x 24 hours (third stage)
23 ° C x 24 hours (4th stage)
(4) Evaluation method Two sets of the above-described configurations were produced. The combined configuration was visually observed.
○ Both sheets were defect-free x 2 sheets were visually evaluated, and even one sheet was peeled by 1 mm ² or more

In Comparative Example 1, air release during autoclaving was good, but large peeling occurred in the cold cycle test.
In Comparative Example 2, air escape during autoclaving was insufficient, and large peeling occurred in the thermal cycle test.

FIG. 1 (A) is a schematic view showing an example of a method for applying an adhesive composition to a release film, and FIG. 1 (B) is a portion showing a laminate of an adhesive composition-release film. It is sectional drawing. It is the schematic which showed an example of the mechanism which bonds an optical function member and a display part. It is the schematic which shows a mode that the adhesive composition was heat-cured after bonding an optical function member and a display part.

Explanation of symbols

1a Optical functional member (front plate)
2 Display unit 10 Adhesive composition 70 Irradiation source (black light)
80 Heating and pressing means (autoclave)

Claims (10)

  In the method for manufacturing an optical function member integrated display device in which the optical function member and the display unit are integrated, the adhesive composition for bonding the optical function member and the display unit includes a raw material polymer, a photopolymerization initiator. And an organic peroxide, and the adhesive composition is previously photocured to prepare a partially crosslinked adhesive composition, and then the optical functional member and the optical functional member are passed through the adhesive composition. A manufacturing method of a display device integrated with an optical function member, wherein the display unit is bonded together, and then the adhesive composition is thermally cured by heat treatment.   2. The production according to claim 1, wherein a coating liquid containing the adhesive composition is applied to a release film, another release film is bonded to the coated release film, and the coating liquid is photocured in this state. Method.   The production method according to claim 2, wherein the adhesive composition is applied by a wet laminating method.   The production method according to claim 2, wherein the coating liquid is a solventless system. Conditions of the photocuring of the adhesive composition, 1~50mW / cm ² and a manufacturing method of any one of claims 1 to 4, UV irradiated at 100~5000mJ / cm ^2.   The manufacturing method according to any one of claims 1 to 5, wherein the adhesive composition is heated at 50 to 140 ° C for 10 to 120 minutes.   The manufacturing method of any one of Claims 1-6 formed by 0.1-10 mass parts of compounding quantities of the said photoinitiator with respect to 100 mass parts of raw material polymers.   The manufacturing method of any one of Claims 1-7 formed by 0.1-10 mass parts of compounding quantities of the said organic peroxide with respect to 100 mass parts of raw material polymers.   The production method according to claim 1, wherein the raw material polymer is an acrylate-based and / or methacrylate-based polymer.   The manufacturing method according to any one of claims 1 to 9, wherein the film on which the adhesive composition is formed has a thickness of 10 to 3000 µm.

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