JP2007119542A - Ultraviolet reactive adhesive and liquid crystal panel using this ultraviolet reactive adhesive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet reactive adhesive which is cured by irradiation with ultraviolet rays to come to a cured product having a low water absorption after curing, has excellent adhesion performance, and comes to a sealing medium having flexibility following to the pliability of a resin substrate when used as the sealing medium for a liquid crystal display composed of a resin substrate, and a liquid crystal panel rich in flexibility using this ultraviolet reactive adhesive. <P>SOLUTION: The ultraviolet reactive adhesive comprises a radically polymerizable acrylic compound containing a monofunctional acrylic monomer and/or an acrylic oligomer, a polyfunctional cationically polymerizable resin, a noncrystalline polyester resin, an ultraviolet radical polymerization initiator, and an ultraviolet cationic polymerization initiator and is cured by ultraviolet rays of 500-5,000 mJ/cm<SP>2</SP>, and the cured product has an elastic modulus at 25°C of 1×10<SP>7</SP>to 2×10<SP>9</SP>Pa, a glass transition temperature of 10-60°C, and a water absorption of 0.5-2.5%. This adhesive is used as a sealing medium for a liquid crystal panel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultraviolet-reactive adhesive that is cured by ultraviolet irradiation and a liquid crystal panel using the ultraviolet-reactive adhesive.

As shown in FIG. 1, a liquid crystal panel 1 used in a liquid crystal display device such as a liquid crystal display or a liquid crystal television receiver is formed of, for example, an indium tin oxide (hereinafter “ITO”) conductive film (not shown). After the two substrates 2 and 3 are joined at a predetermined interval by a sealing material 4 provided in a frame shape with a liquid crystal injection port (not shown) being partially left, the sealing material The liquid crystal 5 is injected from the liquid crystal injection port into the space formed between the substrate 4 and the substrates 2 and 3, and the liquid crystal injection port is sealed.
As the sealing material 4, a photoreactive adhesive containing a radical polymerization type polyfunctional resin is often used to seal liquid crystal.

  However, a photoreactive adhesive containing a polyfunctional resin has a high shrinkage rate at the time of curing and may have poor adhesion. Therefore, in order to increase the adhesiveness of the photoreactive adhesive, for example, by adding a non-reactive adhesive imparting agent, etc., and reducing the shrinkage rate at the time of curing, the crosslinking density decreases and the water absorption rate increases. It was apt. When the water absorption rate of the photoreactive adhesive is high, the liquid crystal or the like may be contaminated when the photoreactive adhesive is used for sealing the liquid crystal.

  Moreover, in the photoreactive adhesive, various attempts have been made to suppress the decrease in the crosslinking density and increase the adhesion, and the organic material is capable of photoradical polymerization and has a functional group polymerizable with the auxiliary crosslinking material. Adhesives that can be cured in a short time by irradiation with light using a resin as a base resin and can be reliably cured by heat have already been proposed (see Patent Document 1).

  However, the adhesive can be cured by heat by using a base resin such as an epoxy resin or an epoxy acrylate resin and an auxiliary crosslinking material that can react with the base resin. Since it is cured by heat, it takes a long time to cure. Therefore, when the adhesive was used to seal the liquid crystal of the liquid crystal display device, the production efficiency was poor. Furthermore, heating during curing may adversely affect the liquid crystal and the like.

In addition, most of the substrates used heretofore use glass substrates, but recently, polyethylene terephthalate (PET) and polycarbonate that are thinner, lighter, not cracked, bent, etc., compared to glass substrates. Those using resins such as (PC) and polyester (PEs) for the substrate have been developed.
In other words, this makes it possible to easily obtain liquid crystal display devices having various curved shapes as well as flat surfaces.

  However, in the case of an adhesive serving as a conventional sealing material, there has been no adhesive having sufficient flexibility to follow the flexibility of the resin substrate. Therefore, it is the present situation that a liquid crystal panel to be obtained cannot sufficiently satisfy the flexibility.

JP 2003-107494 A

  An object of the present invention is to seal a liquid crystal display device made of a resin substrate, which is cured by irradiation with ultraviolet rays, becomes a cured product having a low water absorption after curing, has an excellent adhesion performance, and is made of a resin substrate. Providing a UV-reactive adhesive that becomes a sealing material with the flexibility to follow the flexibility of a resin substrate when used as a material, and a liquid crystal panel rich in flexibility using this UV-reactive adhesive There is to do.

The ultraviolet-reactive adhesive according to the present invention includes a radical polymerizable acrylic compound containing a monofunctional acrylic monomer and / or an acrylic oligomer, a polyfunctional cationic polymerizable resin, an amorphous polyester resin, an ultraviolet ray It contains a radical polymerization initiator and an ultraviolet cationic polymerization initiator, is cured with an ultraviolet ray of 500 to 5000 mJ / cm ² , and the cured product has an elastic modulus at 25 ° C. of 1 × 10 ⁷ to 2 × 10 ⁹ Pa, a glass transition temperature. Is 10 to 60 ° C., and the water absorption is 0.5 to 2.5%.

In the present invention, acrylic means to include both acrylic and methacrylic.
In the acrylic compound used in the ultraviolet-reactive adhesive of the present invention, at least a monofunctional acrylic monomer and oligomer are used alone or in combination.

The acrylic compound may contain not only a monofunctional acrylic monomer and / or acrylic oligomer but also a polyfunctional compound, but the monofunctional compound is 80% by weight or more in the total amount of the acrylic compound. It is desirable that it be included.
That is, if there is too little monofunctional compound, adhesiveness will fall, and if too much, there exists a possibility that a water absorption may become high.

Monofunctional acrylic monomers include, for example, lauryl acrylate, methoxy-triethylene glycol acrylate, phenoxy-polyethylene glycol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-acryloyloxyethyl-phthalic acid, 2-acryloyloxy Examples include ethyl acid phosphate.
Examples of multifunctional acrylic monomers include 2-butyl 2-ethyl-1.3-propanediol diacrylate, 1.9-nonanediol diacrylate, dimethylol-tricyclodecane diacrylate, bisphenol A EO adduct diacrylate, trimethylol Examples include propane triacrylate.

  Examples of the polyfunctional acrylic oligomer include urethane acrylate, polyester acrylate, and acrylated acrylic oligomer.

  Examples of the polyfunctional cationic polymerizable resin include polyfunctional ones such as an epoxy compound, a vinyl ether compound, and an oxetane compound. In order to further increase the curing rate, a polyfunctional alicyclic epoxy compound is suitable.

Examples of the epoxy compound include bisphenol A diglycidyl ether, novolak type epoxy resins, trisphenol methane triglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin triglycidyl. Examples thereof include glycidyl ether compounds such as ether, trimethylolpropane triglycidyl ether, and propylene glycol diglycidyl ether.

Examples of the alicyclic epoxy compound include 2,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, bis (3,4-epoxycyclohexylmethyl) adipate, 2- (3,4-epoxycyclohexyl- 5,5-spiro-3,4-epoxy) cyclohexanone-meta-dioxane, alicyclic epoxy compounds such as bis (2,3-epoxycyclopentyl) ether, and the like, as commercially available alicyclic epoxy resins, for example, Daicel Chemical Industries, Ltd. EHPE-3150 can be used.

Examples of the vinyl ether compound include triethylene glycol divinyl ether, tetraethylene glycol divinyl ether, trimethylolpropane trivinyl ether, cyclohexane-1,4-dimethylol divinyl ether, 1,4-butanediol divinyl ether, polyester divinyl ether, Examples include polyurethane polyvinyl ether.

Examples of the oxetane compound include 1,4-bis [(3-ethyl-3-oxetanylmethoxy) methyl] benzene, 1,3-bis [(3-ethyl-3-oxetanylmethoxy) methyl] propane, Ethylene glycol bis (3-ethyl-3-oxetanylmethyl) ether, trimethylolpropane tris (3-ethyl-3-oxetanylmethyl) ether, pentaerythritol tetrakis (3-ethyl-3-oxetanylmethyl) ether, dipentaerythritol hexa Examples include kiss (3-ethyl-3-oxetanylmethyl) ether, ethylene oxide-modified bisphenol A bis (3-ethyl-3-oxetanylmethyl) ether, and the like.

As the non-crystalline polyester resin used in the ultraviolet reactive adhesive of the present invention, for example, a compound having a glass transition temperature (hereinafter referred to as “Tg”) of 20 ° C. or less and a molecular weight of 5000 to 100,000 is desirable. . That is, if Tg is low, there is no particular problem, but if Tg exceeds 20 ° C., the adhesiveness may be lowered. In addition, as a commercially available non-crystalline polyester resin that satisfies the above-described conditions, if the molecular weight exceeds 100,000, the viscosity becomes too high, and if the molecular weight is less than 5,000, the water absorption rate may be increased. Examples include Byron 500, Byron 550 and Byron 560 manufactured by Spinning Co., Ltd.

  The ultraviolet radical polymerization initiator is activated when irradiated with light in the ultraviolet region, and proceeds with the polymerization of the radical polymerizable substance. Initiation of ultraviolet radical polymerization used in the ultraviolet reactive adhesive of the present invention Examples of the agent include α-hydroxy-α, α'-dimethyl-acetophenone, 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, 2,2-dimethoxy-1,2-diphenyl. Examples include ethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, and 2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one. Moreover, as a commercial item of α-hydroxy-α, α′-dimethyl-acetophenone, for example, Darocur-1173 manufactured by Merck & Co., Ltd. can be mentioned, and 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) is available. ) Examples of commercially available ketones include Darocur-2959 manufactured by Merck & Co., Ltd., and examples of commercially available 2,2-dimethoxy-1,2-diphenylethan-1-one include, for example, Ciba Specialty Chemicals Examples of commercially available products of 1-hydroxy-cyclohexyl-phenyl-ketone include Irgacure 184 manufactured by Ciba Specialty Chemicals, Inc., and 2-methyl-1 [4- (methylthio) phenyl]- Examples of commercially available 2-morpholinopropan-1-one include Irgacure 907 manufactured by Ciba Specialty Chemicals.

  The ultraviolet cationic polymerization initiator is a catalyst that generates cationic species by light in the ultraviolet region, and examples of the ultraviolet cationic polymerization initiator used in the ultraviolet reactive adhesive of the present invention include boron tetrafluoride. Diazonium salts such as phenyldiazonium salt, sulfonium salts such as tri-4-methylphenylsulfonium salt of arsenic hexafluoride, tri-4-methylphenylsulfonium salt of antimony tetrafluoride, diphenyliodonium salt of phosphorus hexafluoride, Examples thereof include onium salts such as iodonium salts such as diphenyliodonium salt of antimony hexafluoride, iron-arene complexes such as ferrocene derivatives, and arylsilanol-aluminum complexes.

  Commercially available products of the above-mentioned ultraviolet cationic polymerization initiator include, for example, Irgacure 261 manufactured by Ciba Geigy, Optomer SP-150, Optmer SP-151, Optmer SP-170, Optomer SP-171, General Electric, manufactured by Asahi Denka Kogyo. UVE-1014 manufactured by Sartomer, CD-1012 manufactured by Sartomer, Sun-Aid SI-60L, Sun-Aid SI-80L, Sun-Aid SI-100L manufactured by Sanshin Chemical Industry Co., Ltd., CI-2064, CI-2639 manufactured by Nippon Soda Co., Ltd. CI-2624, CI-2481, RHODORSIL PHOTOINITITOR 2074 manufactured by Rhone-Poulenc, UVI-6992 manufactured by Union Carbide, BBI-103 manufactured by Midori Chemical Co., MPI-103, TPS-103, MDS-103, DTS-1 3, NAT-103, NDS-103, and the like, in particular, OPTOMER SP-170, manufactured by Union Carbide Corporation of UVI-6992 is preferably used.

Furthermore, the ultraviolet-reactive adhesive of this invention hardens | cures with the ultraviolet rays of 500-5000mJ / cm < ² >, 25 degreeC elastic modulus of hardened | cured material is 1 * 10 < ⁷ > -2 * 10 < ⁹ > Pa, Glass transition temperature is 10--10. Although it is limited to what becomes 60 degreeC and water absorption 0.5-2.5%, the reason is that when the elastic modulus of 25 degreeC of hardened | cured material is less than 1 * 10 < ⁷ > Pa, water absorption may become high. If the elastic modulus exceeds 2 × 10 ⁹ Pa, it may be easily cracked. Moreover, when the glass transition temperature is less than 10 ° C., the water absorption rate increases, and when the glass transition temperature exceeds 60 ° C., flexibility may be lost and cracking may occur.

Further, the ultraviolet-reactive adhesive of the present invention is not particularly limited, but the polyfunctional cationic polymerizable resin is 16.7 to 75 parts by weight with respect to 100 parts by weight of the radical polymerizable acrylic compound, and the amorphous polyester resin. Is 16.7 to 75 parts by weight, the ultraviolet radical polymerization initiator is 0.17 to 12.5 parts by weight, and the ultraviolet cationic polymerization initiator is 0.17 to 12.5 parts by weight (preferably 1.0 to 10.0). (Part by weight) is preferably contained. That is, when there are too many acrylic compounds, a water absorption rate will become high, and when too few, quick-cure property and adhesiveness will worsen. If there are too many cationically polymerizable compounds, adhesiveness will worsen, and if there are too few, water absorption will become high. When there is too much non-crystalline polyester resin, heat resistance and reliability will become low, and when too small, adhesiveness will worsen. If there are too many ultraviolet radical polymerization initiators or ultraviolet cationic polymerization initiators, they will remain as plasticizers, which may cause problems such as liquid crystal contamination, and if too little, curing will be poor.

  The ultraviolet-reactive adhesive of the present invention further includes the above-mentioned acrylic compound, polyfunctional cationic polymerizable resin, non-crystalline polyester resin, and ultraviolet radical polymerization as long as the purpose of the present invention is not impaired. In addition to the main components of the initiator and the ultraviolet cationic polymerization initiator, known sensitizers, polymerization inhibitors, antioxidants, ultraviolet absorbers, light stabilizers, antifoaming agents, leveling agents, pigments, and tackifying resins Further, a viscosity modifier or the like may be appropriately blended.

The tackifying resin is not particularly limited. For example, rosin resin, modified rosin resin, terpene resin, terpene phenol resin, aromatic modified terpene resin, C5 or C9 petroleum resin, and chroman resin. Etc.
The above viscosity modifier is blended for the purpose of improving the coating performance. And regulators such as acrylic polymer, polyester, polyurethane, silicone resin, polyvinyl ether, polyvinyl chloride, polyvinyl acetate, polyisobutylene, and waxes.

  In the present invention, since ultraviolet cationic polymerization and ultraviolet radical polymerization are used in combination, these components are contained in the system in order to suppress the deactivation of active species by oxygen concentration, moisture, amine compounds, and alkali compounds. Care must be taken not to mix.

The ultraviolet-reactive adhesive of the present invention is preferably sensitive to light containing a wavelength component of at least 300 nm to 800 nm. In the case of being sensitive to light containing only a wavelength component of less than 300 nm, when the adhesive is applied thickly, the light irradiation surface is likely to be skinned and may not be uniformly cured from the surface layer to the deep part. On the other hand, when exposed to light containing only a wavelength component exceeding 800 nm, it is difficult to cause skinning and cures uniformly in the deep part, but it becomes difficult to give sufficient light energy, and the curing rate may be slow. .
Moreover, light of 300 nm or less may be blocked and light irradiation may be performed so that only the surface layer is prevented and the interior is cured.

  As the light source lamp used for the light irradiation, a lamp having a distribution with a light wavelength of 300 nm to 800 nm is used. As the light source lamp, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp chemical lamp, a black light lamp, a microwave excitation mercury lamp, a metal halide lamp, a sodium lamp, a fluorescent lamp, or the like is used. Natural light such as sunlight may be used for light irradiation.

  The ultraviolet-reactive adhesive of the present invention preferably has a viscosity of 10,000 to 100,000 mPa · s at 10 to 40 ° C. That is, in the above temperature range, if the viscosity is less than 10,000 mPa · s, the fluidity may be too high. If the fluidity is too high, the adhesive tends to flow out to a portion where it should not be applied, resulting in poor workability, and the liquid crystal is easily contaminated when the adhesive is used for sealing the liquid crystal. On the other hand, when the viscosity exceeds 100,000 mPa · s, the fluidity may be too low, and the coating operation may be difficult.

The liquid crystal panel according to the present invention (hereinafter referred to as “the liquid crystal panel of the present invention”) includes at least two base materials composed of a resin film having an elastic modulus of 50 to 300 kgf / cm ² and a breaking elongation of 50 to 500%. A liquid crystal filling space formed by the ultraviolet reactive adhesive according to claim 1 or 2 is filled with liquid crystal.

In the liquid crystal panel of the present invention, as the substrate, for example, a resin film subjected to a conductive treatment such as ITO (indium tin oxide) treatment is used.

The resin film is limited to those having an elastic modulus of 50 to 300 kgf / cm ² and an elongation at break of 50 to 500%. The reason is that when the elastic modulus is less than 50 kgf / cm ² , shape retention becomes difficult. If the elastic modulus exceeds 300 kgf / cm ² , flexibility may be lost and cracking may occur.
When the elongation at break is less than 50%, the flexibility is lost and it becomes easy to break, and when the elongation at break exceeds 500%, shape retention may be difficult.
The liquid crystal panel of the present invention can be manufactured, for example, as follows.
That is, first, an ultraviolet-reactive adhesive is applied in a frame shape to the surface of the edge of one substrate that is the target object, except for the liquid crystal injection port portion, but the application method is not particularly limited, for example, Examples of the method include spin coating, dip coating, gravure coating, roll coater, comma coater, shim sizer, size press, and screen printing.

The temperature at the time of coating is preferably 15 to 80 ° C., but it is appropriately selected depending on the selected substrate and coating method.
Then, as described above, the adhesive is applied to the base material, and the two base materials are bonded together, and the adhesive is irradiated with ultraviolet rays through the resin film, and the polymerization component in the UV-reactive adhesive of the present invention Is polymerized.

Suitable UV dose, also influenced by the amount of catalyst, depending on the thickness of the ultraviolet reactive adhesive layer which is applied, for example 500~5000mJ / cm ^2, preferably 500~3000mJ / cm ² It is good to do. This is also affected by additives such as the type and amount of reactive groups in the resin used, the thickness of the layer, and the fillers contained.
Next, liquid crystal is injected from a liquid crystal injection port into a liquid crystal injection space formed by two substrates and an adhesive hardened as a sealing material to obtain a liquid crystal panel 1 as shown in FIG.

As described above, the ultraviolet reactive adhesive of the present invention is a radical polymerizable acrylic compound containing an acrylic monomer and / or an acrylic oligomer, a polyfunctional cationic polymerizable resin, an amorphous polyester resin, It contains an ultraviolet radical polymerization initiator and an ultraviolet cationic polymerization initiator, is cured with ultraviolet rays of 500 to 5000 mJ / cm ² , and the elastic modulus at 25 ° C. of the cured product is 1 × 10 ⁷ to 2 × 10 ⁹ Pa, glass transition Since the temperature is 10 to 60 ° C. and the water absorption rate is 0.5 to 2.5%, it cures in a short time and has a low water absorption rate and excellent adhesiveness after curing, and also has excellent flexibility after curing. ing.

The liquid crystal panel of the present invention comprises at least two base materials composed of a resin film having an elastic modulus of 50 to 300 kgf / cm ² and a breaking elongation of 50 to 500%, and the ultraviolet reaction according to claim 1 or 2. Since the liquid crystal filling space formed by the mold adhesive is filled with the liquid crystal, the liquid crystal panel can be excellent in flexibility and the usage of the liquid crystal panel is widened.

  Hereinafter, the present invention will be described in more detail with reference to examples. In addition, this invention is not limited to a following example.

(Example 1)
In a sample bottle of about 200 mL, 100 g of 2-hydroxy-3phenoxypropyl acrylate (epoxy ester M-600A manufactured by Kyoeisha Chemical Co., Ltd.), a monofunctional radical polymerizable acrylic compound, polyfunctional cationic polymerizable substance (Japan Epoxy Resin) Epicoat 828) 40g, low Tg (4 ° C) polyester resin (Toyobo Co., Ltd. Byron 500) 60g, UV cationic polymerization initiator (Union Carbide UVI-6992) 4g, UV radical polymerization started 3 g of an agent (Irgacure 651 (manufactured by Ciba Specialty Chemicals)) was heated and mixed at 150 ° C. to obtain a UV-reactive adhesive.

(Comparative Example 1)
In a sample bottle of about 200 mL, 100 g of bifunctional acrylic monomer (1,6-hexanediol diacrylate manufactured by Kyoeisha Chemical Co., Ltd.), polyfunctional cationic polymerizable substance: 40 g of Epicoat 828 (manufactured by Japan Epoxy Resin Co., Ltd.), ultraviolet cationic polymerization 3 g of an initiator (UVI-6992 manufactured by Union Carbide) and 2 g of an ultraviolet radical polymerization initiator (Irgacure 651 manufactured by Ciba Specialty Chemicals) were mixed and heated and melted at 60 ° C. to obtain a UV-reactive adhesive.

(Comparative Example 2)
In a sample bottle of about 200 mL, 100 g of the above 2-hydroxy-3phenoxypropyl acrylate (epoxy ester M600-A manufactured by Kyoeisha Chemical Co., Ltd.), low Tg (4 ° C.) polyester (byron 500 manufactured by Toyobo Co., Ltd.) as an amorphous polyester resin ) 60 g and 2 g of an ultraviolet radical polymerization initiator (Irgacure 651 manufactured by Ciba Specialty Chemicals) were heated and mixed at 150 ° C. to obtain an ultraviolet-reactive adhesive.

The UV-reactive adhesives prepared in the above Examples and Comparative Examples were applied to an ITO conductive treated 130 μm-thick PET film (elastic modulus 193 kgf / cm ² , elongation at break 175%) as a substrate with a thickness of about 50 μm. Then, it was applied so that it was sandwiched between another PET film. Thereafter, ultraviolet rays having an intensity of 365 nm of 1500 mJ / cm ² were irradiated to cure the adhesive by reaction.
The elastic modulus and breaking elongation of the PET film as the resin film were measured with a dumbbell shape No. 3 and a tensile speed of 50 mm / min using a tensile tester “Instron 4469” as a measuring device. The elongation at break was set to elongation at break / distance between gauge points 20 mm.

  The adhesive strength of the UV-reactive adhesive cured after irradiation was determined as follows, and the results are shown in Table 1. Further, the water absorption, 25 ° C. elastic modulus, and Tg were determined as follows, and the results are also shown in Table 1.

(Adhesive strength)
180 ° peel was measured by testing at a rate of 50 mm / min using a tensile tester.
(Water absorption)
The amount of water absorption was determined from the weight of the cured product of 100 μm thick UV-reactive adhesive before being immersed in water at 23 ° C. and after being immersed in water at 23 ° C. for 24 hours. It was determined by dividing the amount of water absorption by the weight before immersion in water.
(25 ° C elastic modulus)
A cured UV-reactive adhesive having a thickness of 100 μm was measured with a dynamic viscoelasticity measuring device (DVA-200, manufactured by IT Measurement & Control Co., Ltd.) in a shear mode at 10 Hz.
(Tg)
Tonset (TR K 0005 compliant) was calculated from the elastic modulus of the dynamic viscoelasticity measuring apparatus.

  As shown in Table 1, the ultraviolet-reactive adhesive of Example 1 had high adhesiveness and low water absorption, and exhibited sufficient curability even immediately after ultraviolet irradiation.

  On the other hand, since the ultraviolet-reactive adhesive of Comparative Example 1 does not contain an amorphous polyester resin, the crosslinking density is high and the water absorption is low, but the adhesiveness is poor. The ultraviolet-reactive adhesive of Comparative Example 2 did not contain a polyfunctional cation polymerizable substance, and thus exhibited adhesiveness to some extent, but had a high water absorption rate.

The front sectional view showing typically an example of a liquid crystal panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Base material 3 Base material 4 Sealing material 5 Liquid crystal

Claims (3)

Radical polymerizable acrylic compound containing monofunctional acrylic monomer and / or acrylic oligomer, polyfunctional cationic polymerizable resin, amorphous polyester resin, ultraviolet radical polymerization initiator, and ultraviolet cationic polymerization initiator wherein the door, cured with ultraviolet 500~5000mJ / cm ^2, 25 ℃ elastic modulus ^{1 × 10 7 ~2 × 10 9} Pa of the cured product, the glass transition temperature of 10 to 60 ° C., water absorption 0. An ultraviolet-reactive adhesive characterized by being 5 to 2.5%.   The polyfunctional cationic polymerizable resin is 16.7 to 75 parts by weight, the non-crystalline polyester resin is 16.7 to 75 parts by weight, and the ultraviolet radical polymerization initiator is 0.1 parts by weight with respect to 100 parts by weight of the radical polymerizable acrylic compound. The ultraviolet-reactive adhesive according to claim 1, wherein 17 to 12.5 parts by weight and an ultraviolet cationic polymerization initiator are contained in a proportion of 0.17 to 12.5 parts by weight. A liquid crystal formed by two base materials made of a resin film having at least an elastic modulus of 50 to 300 kgf / cm ² and a breaking elongation of 50 to 500%, and the ultraviolet reactive adhesive according to claim 1. A liquid crystal panel characterized in that liquid crystal is filled in a filling space.

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