JP2008241727A - Manufacturing method of image display device and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an image display device having a transparent resin layer installed between an image display panel and a protection panel to improve the shock resistance, which is capable of forming the transparent resin layer with high productivity without bubbles in the transparent resin layer. <P>SOLUTION: The manufacturing method of the image display device having a transparent filler disposed between the image display panel and the protection panel installed in the front of this image display panel in close contact with these panels without an air layer between them includes steps of: charging the liquid transparent filler into a region surrounded with a frame material having many air-permeable pores, of one of the image display panel and the protection panel provided with frame materials; placing the other of the image display panel and the protection panel on the frame material; and solidifying the liquid transparent filler. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display panel and a manufacturing method thereof. The image display panel is a plasma display panel (PDP), a liquid crystal display (LCD), an organic EL display (OLED), a field emission display (FED), or the like. In addition to the display panel, it can also be used on the surface of a panel displaying still images such as photographs and paintings. More specifically, the present invention relates to an image display panel having a structure for protecting the image display panel from various use environments and use conditions without impairing the visibility of the image display panel, and a method for manufacturing the image display panel. is there.

  A liquid crystal display device is exemplified as a typical image display panel. A liquid crystal display device includes a liquid crystal cell in which liquid crystal is filled and sealed through a gap of about several microns between a glass substrate having a thickness of about 1 mm on which transparent electrodes, pixel patterns and the like are formed, and both outer surfaces thereof. It is a thin and easily scratched display part made of an optical film such as a polarizing plate attached to the surface. For this reason, particularly in mobile phones, game machines, digital cameras, in-vehicle applications, etc., a liquid crystal display device having a structure in which a transparent protective panel is provided with a certain space in front of the liquid crystal display device is generally used. Yes.

  FIG. 1 is a schematic cross-sectional view showing an example of a conventional liquid crystal display device. A liquid crystal display cell 4 is a structure in which a liquid crystal 3 is sealed while two transparent glasses 1 face each other with a spacer 2 interposed between them. A polarizing plate 5 or the like is attached to one or both sides of the outside of the glass 1. In addition, the liquid crystal panel 6 is configured. On one side of the liquid crystal panel 6, a backlight unit 9 made of a reflector, a light guide plate, a diffusion sheet or the like is disposed. A protective plate 7 is disposed on the other side of the liquid crystal panel 6 with a space 8 interposed therebetween. The protection plate 7 is a transparent plate, and a transparent plastic such as glass, acrylic resin, or polycarbonate resin is used. The space 8 is provided so that the influence of mechanical pressure applied from the outside does not directly affect the liquid crystal panel 6, and it is assumed that the mobile phone, game machine, digital still camera, etc. are carried. This is a particularly necessary configuration for a liquid crystal display used in a device.

  The refractive index of the transparent viewing portion of the protective panel is generally 1.4 to 1.6, and the refractive index of the transparent plastic film constituting the outermost layer of the polarizing plate attached to the viewing side of the liquid crystal display cell is generally 1. 5 to 1.6. On the other hand, since the air gap 8 is made of air (air layer) and its refractive index is 1, reflection loss due to Fresnel reflection occurs at each interface, and there is a problem that display characteristics are greatly deteriorated. Also, in applications that require high image quality, such as televisions and monitors, it is not possible to provide a protective panel that impairs the display performance of the liquid crystal display, and if you press the screen with your finger, the picture is distorted and commercialized today. Has reached.

  Therefore, various structures have been studied for the purpose of improving the visibility, strength, and the like, and the structure in which the gap 8 is replaced with a transparent substance and the manufacturing method therefor. Although the above problem can be solved by replacing the gap 8 with a transparent substance, as a new problem, when a transparent substance is interposed, there is a problem that visibility is lowered due to entrainment of bubbles.

  According to Patent Document 1, in forming a transparent resin layer between an image display panel (liquid crystal cell) and a protective panel, (1) a deformation allowable range is obtained while deaerating each other. Adhesion bonding by pressing using a spacer having, (2) Adhesion bonding by overflow using a forming frame in which a discharge path is formed, (3) Using a protective panel engraved with injection holes and exhaust holes The problem is solved by adopting any one of the methods of tight junction using the deaeration action using the suction pump. The liquid resin is supplied into the space surrounded by the spacer or the molding frame, and then the liquid resin is cured.

JP-A-6-337411

  However, even with the method of Patent Document 1, the problem of entrainment of bubbles still remains as a problem to be solved. Furthermore, in the method (1), strict quantification of the supply of the liquid resin is necessary, Otherwise, it is necessary to treat excess resin, and in the method (2), it takes time to flatten the resin, and it is necessary to treat the exuded resin. The method (3) has problems such as troublesome processing, complicated manufacturing equipment and work, and as a result, the production management of the image display apparatus is complicated. There is a problem of reduced productivity. Further, in any method, it is necessary to process a special shape on the spacer, the forming frame, or the protective panel, and an inexpensive flat plate cannot be used. In addition, there are pores remaining around the discharge path and the injection hole, and even in the outer periphery that does not directly affect the image, the protective panel floats or peels off in the long-term use environment as a result of the bubbles. There is a problem that it is easy. In addition, as a method for treating the exuded liquid resin, there is a problem that a wiping operation is required for each panel.

  In view of such problems, the present invention provides a transparent filler in a method for manufacturing an image display device in which a transparent filler is closely disposed without an air layer interposed between an image display panel and a protective panel. It is a first object of the present invention to provide a method for easily and efficiently producing an image display device having excellent visibility without air bubble entrainment, and such an image display device. A second object of the present invention is to solve the problem of the seepage of the filler, and to provide a manufacturing method of an image display device with higher productivity and such an image display device.

The present invention relates to the following.
1. In a method for manufacturing an image display device in which a transparent filler is closely disposed without interposing an air layer between an image display panel and a protective panel installed in front of the image display panel, air can pass therethrough. A step of filling a liquid transparent filler into the inside of one of the image display panel or the protective panel in which a frame material having a large number of voids is surrounded by the frame material, and for displaying the image on the frame material A method for manufacturing an image display device, comprising a step of placing the other panel of the panel or the protective panel and a step of solidifying the liquid transparent filler.
2. The method for manufacturing an image display device according to claim 1, wherein the volume of the liquid transparent filler used is equal to or greater than the volume surrounded by the image display panel, the protection panel, and the frame material.
3. 3. The image display device according to claim 1, wherein a volume of the liquid transparent filler used is equal to or less than a sum of a volume surrounded by the image display panel, the protection panel, and the frame material and a total gap of the frame material. Production method.
4). The liquid transparent filler contains a monomer having an acrylic acid derivative polymer and one or more polymerizable unsaturated bonds in the molecule, and polymerizes by irradiation with heat or actinic rays. A method for manufacturing the image display device according to claim 1.
5. The method for manufacturing an image display device according to claim 1, wherein the transparent filler has a total light transmittance of 50% or more.
6). The image display panel according to claim 1, wherein the frame member is an open-cell porous sheet.
7). The method for manufacturing an image display device according to claim 1, wherein a porosity of the frame material is 20% to 98%.
8). The manufacturing method of the apparatus for image display in any one of 1-7 including the process of removing a frame material after the process of solidifying a liquid transparent filler.
9. An image display device obtained by the method according to claim 1, wherein a frame material is impregnated with a transparent filler.

  According to the method for manufacturing an image display device of the present invention, it is possible to easily manufacture an image display device that is free of bubbles in the transparent filler between the image display panel and the protective panel and therefore has excellent visibility. Can do. By surrounding the outer periphery with a large number of voids as a frame material, it is not always necessary to reduce the pressure due to capillary action, and the liquid can be quickly moved to the outer periphery, and accordingly, transparent filling The bubbles entrained in the material can be moved to the outer peripheral portion in a short time, can be eliminated from the visual recognition portion, and can be repelled into the gap of the frame material. In addition, it is possible to easily eliminate the problem of resin protrusion (odor due to resin protrusion, contamination of the housing, stickiness or processing of the resin. For example, it is necessary to wipe out the liquid resin exuded for each panel). . Since there are no remaining bubbles in the visual recognition portion, particularly inside the frame member, it is possible to suppress the separation and enlargement of the bubble portion that is triggered by this. This effect improves long-term reliability under high temperature and high humidity [effect without long-time peeling in an environmental test under high temperature and high humidity, for example, temperature 60 ° C. and humidity 90%]. The image display device obtained by this method is excellent in visibility, and has high productivity and reliability.

  The image display device of the present invention is a display device using an image display panel such as a plasma display panel (PDP), a liquid crystal display (LCD), an organic EL display (OLED), a field emission display (FED) or the like. . In addition to the above display device, for example, a panel on which a still image such as a photograph or a picture is displayed and a protective panel is mounted is also included. The image display panel is a panel for displaying an image used for the image display device described above, and the surface facing the protective panel is made of a transparent base material such as glass, a plastic plate, or a plastic film. A complete image display panel or an intermediate product thereof may be used. Further, the surface of the transparent substrate may be subjected to surface treatment. Surface treatment should improve anti-reflection, anti-static properties, hardness, wear resistance, lubricity, corrosion resistance, oxidation resistance, heat resistance, heat insulation, insulation, adhesion, decorativeness, aesthetics, etc. It will be a purpose. Actually, vapor deposition, sputtering, hard coat, silane coupling agent, plating, etching, gas phase etching, plasma treatment, ultraviolet irradiation treatment, ozone treatment, printing, and the like can be mentioned. The surface treatment includes those in which a sheet-like substrate that has already been surface-treated is attached to a transparent substrate with an adhesive or the like.

  The present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing an example of a liquid crystal display device which is one of the image display devices of the present invention, and a frame member 10 is installed between the liquid crystal panel 6 and the protective panel 7. The space to be partitioned is filled with the transparent filler 11 and is in close contact with the liquid crystal panel 6 and the protective panel 7. In the liquid crystal panel, a driver chip for operating the liquid crystal panel may be mounted on a transparent substrate (glass or the like) forming the liquid crystal panel, and a cable connecting the driver chip and an output circuit may be provided. As a final product, the liquid crystal panel is incorporated into a housing (housing) of a personal computer, a mobile phone, a television, etc., and is used by being fixed. In the present invention, even when a casing or the like is previously installed on the liquid crystal panel, this is included in the image display panel. The backlight 9 is indispensable as a liquid crystal display device, but is not essential as an image (liquid crystal) display device or an image (liquid crystal) display device panel of the present invention. Some reflective liquid crystal devices do not necessarily require a backlight.

  The image display panel of the present invention, for example, a small display of about 2 inches such as a liquid crystal display of a mobile phone, to a large display of 32 inches or more can be applied regardless of the size. In particular, the present invention is effective for a large display of 32 inches or more in which bubbles are likely to be involved. This is because the entrainment of bubbles in the transparent resin layer can be moved to the outer peripheral portion in a short time and eliminated from the visual recognition portion.

  In the present invention, the protective panel serves to protect the outer surface of the display device and the image display device, and is required to have surface hardness and scratch resistance. In the liquid crystal display device, the phase difference due to birefringence of the protective panel is preferably 50 nm or less. In the liquid crystal display device, when the birefringence of the transparent viewing portion exceeds 50 nm, the excellent color tone of the image display panel tends to be affected.

  When the ultraviolet transmittance at a wavelength of 365 nm is less than 1%, when the ultraviolet curable liquid is cured to form a transparent filler, the amount of exposure sufficient by ultraviolet irradiation from the transparent viewing portion side (protective panel side) Therefore, when the ultraviolet ray is irradiated from the transparent visual recognition part side, it is preferable that the ultraviolet ray transmittance at a wavelength of 365 nm of the protective panel is 1% or more.

Examples of the material used for the transparent viewing portion of the protective panel include glass and transparent resin.
These preferably have a small optical distortion. As transparent resins, acrylic resin, olefin resin, cycloolefin resin, fluorine resin, low birefringence polycarbonate resin, low birefringence polyester resin, silicone resin, etc. are particularly suitable for UV transmission and low birefringence. A resin material having excellent properties is preferably mentioned. There may be a frame called black sera other than the visual recognition part of the protective panel. The black sera function has the effect of hiding the IC driver and the connection part by blackening the peripheral part other than the visual recognition part. The protection panel includes those that are surface-treated. Surface treatment should improve anti-reflection, anti-static properties, hardness, wear resistance, lubricity, corrosion resistance, oxidation resistance, heat resistance, heat insulation, insulation, adhesion, decorativeness, aesthetics, etc. It will be a purpose. Actually, vapor deposition, sputtering, hard coat, silane coupling agent, plating, etching, gas phase etching, plasma treatment, ultraviolet irradiation treatment, ozone treatment, printing, and the like can be mentioned. The surface treatment includes those in which a sheet-like substrate that has already been surface-treated is attached to a protective panel with an adhesive or the like.

In the present invention, the transparent filler is a solidified liquid transparent filler.
The thickness of the transparent filler can be freely selected according to the specifications of the image display device, but a preferable range is 0.1 to 10 mm. If the thickness is less than 0.1 mm, it tends to be difficult to absorb external stress, and if it exceeds 10 mm, the transparency and hue tend to decrease.

  The transparent filler in the present invention preferably has a visible light transmittance of 50% or more. Pigments and dyes may be included for the purpose of color adjustment and control of ultraviolet and infrared transmission.

  The liquid transparent filler is in a liquid state under the condition of filling on the image display panel or the protection panel, and can be solidified later.

In the present invention, as a liquid transparent filler, specifically, a thermosetting monomer or a photocurable monomer, an oligomer thereof, a polymer or a mixture of the oligomer and the monomer, a thermal polymerization initiator or a photopolymerization. Examples include liquid materials containing initiators, thermoplastic resins, transparent inorganic films by the sol-gel method, etc. (The sol-gel method uses an inorganic or organometallic salt solution as a starting solution. A colloidal solution (Sol) is obtained by hydrolysis and condensation polymerization, and a solid (Gel) that loses fluidity is formed by further promoting the reaction.This is a method for producing glass or ceramics by heat-treating this Gel. .
). Among them, a liquid material obtained by blending a photopolymerization initiator or the like with a mixture of an ultraviolet curable monomer, an oligomer or polymer thereof and the monomer is preferable.

  The liquid transparent filler can be suitably used as a crosslinkable silicone rubber resin, a crosslinkable polyurethane elastomer or other resin composition from the viewpoint that adhesive strength can be imparted to join the protective panel and the liquid crystal panel. Methacrylic acid or acrylic acid, ester compounds and other derivatives thereof (including oligomers, which are hereinafter referred to as acrylic acid derivatives), polymers of acrylic acid derivatives or acrylic acid derivatives and these polymers are preferably included. In particular, it is more preferable to contain acrylic acid and its derivatives (including oligomers) from the viewpoint that photocuring can be performed in a short time.

Examples of the acrylic acid derivatives include acrylic acid or methacrylic acid, and derivatives thereof. Specifically, in addition to acrylic acid and methacrylic acid, compounds having one polymerizable unsaturated bond in the molecule include methyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, 2-ethylhexyl methacrylate, isononyl methacrylate, Alkyl methacrylate such as n-octyl methacrylate, lauryl methacrylate, stearyl methacrylate, methyl acrylate, n-butyl acrylate, i-butyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, alkyl acrylate such as n-octyl acrylate, benzyl methacrylate, etc. Aralkyl methacrylates such as aralkyl methacrylate and benzyl acrylate, and alkoxyalkyl methacrylates such as butoxyethyl methacrylate. , Alkoxyalkyl acrylates such as butoxyethyl acrylate, aminoalkyl methacrylates such as N, N-dimethylaminoethyl methacrylate, aminoalkyl acrylates such as N, N-dimethylaminoethyl acrylate, methacrylate esters of diethylene glycol ethyl ether, triethylene Methacrylic acid ester of glycol butyl ether, methacrylic acid ester of polyalkylene glycol alkyl ether such as methacrylic acid ester of dipropylene glycol methyl ether, acrylic acid ester of diethylene glycol ethyl ether, acrylic acid ester of triethylene glycol butyl ether, dipropylene glycol methyl ether ) Polyalkylene glycol alkyl such as acrylic acid ester Acrylic esters of ether, methacrylic esters of polyalkylene glycol aryl ethers such as methacrylic esters of hexaethylene glycol phenic ether, acrylic esters of polyalkylene glycol aryl ethers such as acrylic esters of hexaethylene glycol phenic ether, cyclohexyl methacrylate Methacrylic acid ester having an alicyclic group such as cyclohexyl acrylate, dicyclopentanyl methacrylate, dicyclopentanyl acrylate, isobornyl methacrylate, methoxylated cyclodecatriene methacrylate, isobornyl acrylate, methoxylated cyclodecatriene acrylate Or fluorinated alkyl such as acrylic ester, heptadecafluorodecyl methacrylate, etc. Fluorinated alkyl acrylates such as methyl methacrylate, heptadecafluorodecyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate Methacrylic acid ester or acrylic acid ester having a hydroxyl group such as glycerol methacrylate or glycerol acrylate, Methacrylic acid ester or acrylic acid ester having a carboxyl group such as acrylic acid or methacrylic acid, Methacrylic acid having a glycidyl group such as glycidyl methacrylate or glycidyl acrylate Acid ester or acrylic acid ester, acrylamide, etc. are mentioned. These can be used alone or in combination of two or more.
These compounds having one polymerizable unsaturated bond in the molecule can be used alone or in combination of two or more.

  In the present invention, a compound having two or more polymerizable unsaturated bonds in the molecule and a compound having one or more polymerizable unsaturated bonds in the molecule can be used as the acrylic acid derivative. Such compounds include bisphenol A dimethacrylate, 1,4-butanediol dimethacrylate, 1,3-butylene glycol dimethacrylate, diethylene glycol dimethacrylate, glycerol dimethacrylate, neopentyl glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene. Glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, tris (methacryloxyethyl) isocyanurate, pentaerythritol tetramethacrylate, dipentaerythritol tetramethacrylate, dipentaerythritol hexamethacrylate, dipentaerythritol Pentame Acrylate, bisphenol A diacrylate, 1,4-butanediol diacrylate, 1,3-butylene glycol diacrylate, diethylene glycol diacrylate, glycerol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, Tetraethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, tris (acryloxyethyl) isocyanurate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, etc. Can be mentioned.

（ただし、式中、Ｒはエチレン基又はプロピレン基を示し、ｍ及びｎはそれぞれ独立に、１〜２０の整数を示す。）で示されるビスフェノールＡのアルキレンオキシド付加物のジアクリレート化合物、これらのアクリロイル基をメタクリロイル基に換えた化合物、一般式（ｂ）

（ただし、式中、ｍ及びｎはそれぞれ独立に、１〜１０の整数を示す。）で示されるビスフェノールＡのエピクロルヒドリン変性物とアクリル酸の付加エステル化物、これらのアクリロイル基をメタクリロイル基にかえた化合物、一般式（ｃ）

（ただし、式中、Ｒはエチレン基又はプロピレン基を示し、ｍ及びｎはそれぞれ独立に、１〜２０の整数を示す。）で示されるリン酸のアルキレンオキシド付加物のジアクリレート化合物、これらのアクリロイル基をメタクリロイル基にかえた化合物、一般式（ｄ）

（ただし、式中、ｍ及びｎはそれぞれ独立に、１〜１０の整数を示す。）で示されるフタル酸のエピクロリン変性物とアクリル酸の付加エステル化物、これらのアクリロイル基をメタクリロイル基にかえた化合物、一般式（ｅ）

（ただし、式中、ｍ及びｎはそれぞれ独立に、１〜２０の整数を示す。）で示される１，６−ヘキサンジオールのエピクロリン変性物とアクリル酸の付加エステル化物（アクイリル基を一分子中に２個有するもの）、これらのアクリロイル基をメタクリロイル基にかえた化合物、一般式（ｆ）

（ただし、式中、Ｒはエチレン基又はプロピレン基を示し、３個のｍはそれぞれ独立に、１〜２０の整数を示す。）で示されるリン酸のアルキンオキシド付加物のトリアクリレート化合物、これらのアクリロイル基をメタクリロイル基にかえた化合物、一般式（ｇ）

（ただし、式中、Ｒはエチレン基又はプロピレン基を示し、ｍ、ｍ′及びｍ″はそれぞれ独立に、１〜２０の整数を示す。）で示されるトリメチロールプロパンのアルキレンオキシド付加物のトリアクリレート化合物、これらのアクリロイル基をメタクリロイル基にかえた化合物などが挙げられる。これらのモノマーは、単独で又は２種以上を組み合わせて用いることができる。 Among the acrylic acid-based derivatives, the compound having two or more polymerizable unsaturated bonds in the molecule is further represented by the general formula (a)

(In the formula, R represents an ethylene group or a propylene group, and m and n each independently represents an integer of 1 to 20.) Diacrylate compounds of an alkylene oxide adduct of bisphenol A, Compound in which acryloyl group is replaced with methacryloyl group, general formula (b)

(In the formula, m and n each independently represents an integer of 1 to 10.) An epichlorohydrin modified product of bisphenol A and an addition esterified product of acrylic acid, and these acryloyl groups were changed to methacryloyl groups. Compound, general formula (c)

(In the formula, R represents an ethylene group or a propylene group, and m and n each independently represents an integer of 1 to 20.) Diacrylate compounds of an alkylene oxide adduct of phosphoric acid represented by these, Compound in which acryloyl group is replaced with methacryloyl group, general formula (d)

(In the formula, m and n each independently represent an integer of 1 to 10.) An epichlorine modified product of phthalic acid and an addition esterified product of acrylic acid, and these acryloyl groups were replaced with methacryloyl groups. Compound, general formula (e)

(In the formula, m and n each independently represents an integer of 1 to 20.) 1,6-hexanediol epichlorine modified product and acrylic acid addition esterified product (acylyl group in one molecule) A compound having these acryloyl groups in place of methacryloyl groups, a compound represented by the general formula (f)

(Wherein, R represents an ethylene group or a propylene group, and three m's each independently represents an integer of 1 to 20), triacrylate compounds of alkyne oxide adducts of phosphoric acid represented by these, A compound in which the acryloyl group is replaced with a methacryloyl group, general formula (g)

(In the formula, R represents an ethylene group or a propylene group, and m, m ′ and m ″ each independently represents an integer of 1 to 20.) Trimethylolpropane alkylene oxide adduct tri Examples include acrylate compounds, compounds obtained by replacing these acryloyl groups with methacryloyl groups, etc. These monomers can be used alone or in combination of two or more.

In the present invention, a high molecular weight crosslinking agent can be used as a compound having two or more polymerizable unsaturated bonds in the molecule.
High molecular weight crosslinking agents include the following.
(A) Di (meth) acrylate of a dialcohol compound, for example, obtained by reacting polyalkylene glycol such as polyethylene glycol, polypropylene glycol, polybutylene glycol and the like with acrylic acid or methacrylic acid.
(B) an epoxy resin having two epoxy groups in the molecule such as di (meth) acrylate of epoxy resin, for example, diglycidyl ether of polyalkylene glycol such as polyethylene glycol, polypropylene glycol, and polybutylene glycol; Obtained by reacting acrylic acid or methacrylic acid.
(C) Di (meth) acrylate of polyester whose both ends are hydroxyl groups; specifically, a polyester polyol is produced by reacting a saturated acid with a polyhydric alcohol. Examples of saturated acids include aliphatic dicarboxylic acids such as azelaic acid, adipic acid, and sebacic acid. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, butylene glycol, polyethylene glycol, and polypropylene glycol. is there. A polyester di (meth) acrylate can be obtained by reacting such a polyester polyol with acrylic acid or methacrylic acid.
(D) Poly (di) methacrylate of polyurethane; specifically, polyurethane is obtained by reacting a polyhydric alcohol compound and a polyvalent isocyanate compound. Examples of polyhydric alcohols include propylene glycol, tetramethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, 2-methyl- 1,8-octanediol, 1,9-nonanediol, 3-methyl-1,5-pentanediol, poly1,2-butylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene glycol-propylene glycol block copolymer, Ethylene glycol-tetramethylene glycol copolymer, methylpentanediol modified polytetramethylene glycol, propylene glycol modified polytetramethylene glycol, propylene oxide adduct of bisphenol A There are propylene oxide adducts of hydrogenated bisphenol A, propylene oxide adducts of bisphenol F, propylene oxide adducts of hydrogenated bisphenol F, etc. Polyisocyanate compounds include tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hexa Diisocyanates such as methylene diisocyanate, trimethylhexamethylene diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, norbornene diisocyanate, and the above Diisocyanate polymer or diisocyanate urea Sex body, there is a biuret modified product, or the like.
A polyurethane di (meth) acrylate can be obtained by reacting such a polyurethane compound having a hydroxyl group at the terminal obtained by reacting with an excess of polyhydric alcohol with acrylic acid or methacrylic acid.
(E) A compound obtained by reacting polyurethane with a compound having a hydroxyl group and a reactive double bond; specifically, the polyhydric alcohol and polyhydric isocyanate compound used as the raw material of the polyurethane are the same as described above.
A reactive double bond-terminated polyurethane by reacting a compound having an isocyanate group at the terminal obtained by reacting with such an excess of polyvalent isocyanate with a compound having a hydroxyl group and a reactive double bond. It can be.
Examples of the compound having a hydroxyl group and a reactive double bond include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, polyethylene glycol monoacrylate, polypropylene glycol monoacrylate, ethylene glycol -Propylene glycol block copolymer monoacrylate, ethylene glycol-tetramethylene glycol copolymer monoacrylate, caprolactone-modified monoacrylate (trade name Plaxel FA series, manufactured by Daicel Chemical Industries), acrylic acid derivatives such as pentaerythritol triacrylate, 2-hydroxyethyl Methylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate 4-hydroxybutyl methacrylate, polyethylene glycol monomethacrylate, polypropylene glycol monomethacrylate, ethylene glycol-propylene glycol block copolymer monomethacrylate, ethylene glycol-tetramethylene glycol copolymer monomethacrylate, caprolactone modified monomethacrylate ( Trade name Plaxel FM series: manufactured by Daicel Chemical Industries, Ltd.) and methacrylic acid derivatives such as pentaerythritol trimethacrylate.

  From the viewpoint of the toughness of the cured product, the high molecular weight crosslinking agent is preferably a polyurethane di (meth) acrylate or a reactive double bond-terminated polyurethane (especially a reactive double bond based on a (meth) acryloyl group). . Further, among these, those in which the diol component of the polyurethane is composed of polypropylene glycol or polytetramethylene glycol are more preferable, and those using a polyurethane in which the diol component is polypropylene glycol or polytetramethylene glycol and the diisocyanate component is isophorone diisocyanate. Particularly preferred.

  When the compatibility between the polymer and the high molecular weight crosslinking agent is low, the cured product becomes cloudy when the amount of the high molecular weight crosslinking agent is increased, but the compatibility with the polymer is improved by using alkylene glycol as the raw material for the high molecular weight crosslinking agent. The transparency can be maintained regardless of the amount of the high molecular weight crosslinking agent. Further, by using a high molecular weight crosslinking agent, it is possible to prevent the cured product from becoming brittle or having too low an adhesive force even when used in a relatively large amount. Thereby, the usage-amount of a crosslinking agent can be increased and it can suppress that the characteristic of hardened | cured material changes with the error at the time of a mixing | blending.

As a method for synthesizing the high molecular weight crosslinking agent, known polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization and emulsion polymerization can be used. These methods can also be used for the synthesis of the acrylic acid derivative polymer.
These high molecular weight crosslinking agents can be used alone or in combination of two or more.

  As the reactive compound of the present invention, a compound having one polymerizable unsaturated bond in the molecule such as acrylonitrile, styrene, vinyl acetate, ethylene, propylene is used in addition to the acrylic acid derivative and the high molecular weight crosslinking agent. be able to. In addition, compounds other than the above acrylic acid derivatives and high molecular weight crosslinking agents and having two or more polymerizable unsaturated bonds in the molecule (such as divinylbenzene) can also be used.

  Above, in order to acquire the effect in this invention, 90 weight% or less is preferable and the usage-amount of compounds other than an acrylic acid derivative and a high molecular weight crosslinking agent is preferable among the total amount of the reactive compound to be used, and 50 weight% or less. Is more preferable, and 0 to 20% by weight is particularly preferable.

The amount of the compound having two or more polymerizable unsaturated bonds in the molecule is preferably 0.01 to 70% by weight, more preferably 0.1 to 50% by weight, based on the total amount of the reactive compound used. . If the amount exceeds 70% by weight, the transparent resin layer tends to tear easily due to impact.
Further, the amount of the compound having two or more polymerizable unsaturated bonds in the molecule other than the above-described high molecular weight crosslinking agent (in particular, a monomer or a low molecular weight oligomer) is 0. 0 with respect to the total amount of the reactive compound to be used. 01 to 10% by weight is preferable, and 0.1 to 5% by weight is more preferable. If the amount exceeds 10% by weight, the transparent resin layer tends to tear easily due to impact.

The acrylic acid derivative polymer in the present invention is obtained by polymerizing a compound having one polymerizable unsaturated bond in the molecule among acrylic acid derivatives, and is not polymerizable within a range not impairing the effects of the present invention. A compound having two or more saturated bonds in the molecule may be copolymerized. The weight average molecular weight (measured using a standard polystyrene calibration curve by gel permeation chromatography) is preferably 100,000 to 700,000, more preferably 150,000 to 400,000, 200, 000-350,000 is more preferable.
The acrylic acid derivative polymer may be a polymer obtained by polymerizing an acrylic acid derivative and another compound in combination.

As the polymerization method of the reactive compound described above, a known polymerization method such as bulk polymerization can be used.
In the polymerization of the reactive compound described above, both a photopolymerization initiator and a thermal polymerization initiator can be used as a polymerization initiator, and these may be used in combination. In addition, when polymerization is performed by irradiation with an electron beam, a polymerization initiator may not be used. That is, the curing reaction can be performed by a curing reaction by irradiation with active energy rays, a curing reaction by heat, or a combination thereof. Active energy rays refer to ultraviolet rays, electron beams, α rays, β rays, γ rays and the like.
These methods can also be used for the synthesis of the acrylic acid derivative polymer.

  The photopolymerization initiator can be selected from known materials such as benzophenone, anthraquinone, benzoin, sulfonium salt, diazonium salt, onium salt and the like. These are particularly sensitive to ultraviolet light.

  More specifically, as the photopolymerization initiator, benzophenone, N, N′-tetramethyl-4,4′-diaminobenzophenone (Michler ketone), N, N-tetraethyl-4,4′-diaminobenzophenone, 4 -Methoxy-4'-dimethylaminobenzophenone, α-hydroxyisobutylphenone, 2-ethylanthraquinone, t-butylanthraquinone, 1,4-dimethylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2 -Methylanthraquinone, 1,2-benzoanthraquinone, 2-phenylanthraquinone, 1,4-naphthoquinone, 9,10-phenanthraquinone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimeth Aromatic ketone compounds such as cis-1,2-diphenylethane-1-one and 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzoin compounds such as benzoin, methylbenzoin and ethylbenzoin, benzoinmethyl Benzoin ether compounds such as ether, benzoin ethyl ether, benzoin isobutyl ether, benzoin phenyl ether, benzyl, 2,2-diethoxyacetophenone, benzyldimethyl ketal, β- (acridin-9-yl) acrylic acid diester compound, 9- Acridine compounds such as phenylacridine, 9-pyridylacridine, 1,7-diacridinoheptane, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5 -Di (m-me Xylphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-diphenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-diphenylimidazole dimer, 2- (p- Methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) 5-phenylimidazole dimer, 2- (2,4-dimethoxyphenyl) -4,5-diphenylimidazole Dimer, 2,4,5-triarylimidazole dimer such as 2- (p-methylmercaptophenyl) -4,5-diphenylimidazole dimer, 2-benzyl-2-dimethylamino-1- ( 4-Morpholinophenyl) -1-butanone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-1-propane, bis ( , 4,6-trimethyl benzoyl) - phenyl phosphine oxide, oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone), and the like. In particular, those that do not color the resin composition include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1- [4- (2-hydroxyethoxy)- Α-hydroxyalkylphenone compounds such as phenyl] -2-hydroxy-2-methyl-1-propan-1-one, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6 -Acylphosphine oxide compounds such as -dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, oligo (2-hydroxy-2-methyl- 1- (4- (1-methylvinyl) phenyl) propanone) and A combination of these is preferred. In order to produce particularly thick sheets, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine A photopolymerization initiator containing an acyl phosphine oxide compound such as oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is preferable. In order to reduce the odor of the sheet, oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone) is preferable. These photopolymerization initiators may be used in combination.

  The thermal polymerization initiator is an initiator that generates radicals by heat, and specifically includes benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl. Peroxydicarbonate, di (2-ethoxyethyl) peroxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl Examples thereof include organic peroxides such as peroxide and diacetyl peroxide. In addition, 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbonyl), 2,2′-azobis ( 2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2′-azobis (2-methylpropionate), 4,4′- Azos such as azobis (4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) propane] System compounds.

  The liquid transparent filler and the solidified transparent filler using the same in the present invention preferably have a visible light transmittance of 80% or more.

As the liquid transparent filler in the present invention,
10-80 parts by weight of acrylic acid derivative polymer,
Acrylic acid derivatives (however, compounds having one polymerizable unsaturated bond in the molecule)
A resin composition comprising 15 to 89.49 parts by weight and an acrylic acid derivative (however, a compound having two or more polymerizable unsaturated bonds in the molecule) or 0.5 to 50 parts by weight of a high molecular weight crosslinking agent Is preferred.
Furthermore, 0.01 to 5 parts by weight of a polymerization initiator can be blended, and it is preferably used so as to be 100 parts by weight in total with the above components.
Here, what was demonstrated above can be used for each component.

  In the present invention, a photopolymerization initiator or a thermal polymerization initiator can be used as the polymerization initiator. In the above formulation, when using a photopolymerization initiator as a polymerization initiator, the amount used is preferably 0.1 to 5 parts by weight, and when using a thermal polymerization initiator as a polymerization initiator, the amount used. Is preferably 0.01 to 1 part by weight, and when a photopolymerization initiator and a thermal polymerization initiator are used in combination, they are preferably used in these amounts.

The liquid transparent filler in the present invention is
Acrylic acid derivative polymer 15 to 60 parts by weight, preferably 30 to 60 parts by weight, more preferably 40 to 60 parts by weight Acrylic acid derivative (however, a compound having one polymerizable unsaturated bond in the molecule) 39-84.99 parts by weight, preferably 39-69 parts by weight, more preferably 39-59 parts by weight,
And acrylic acid derivatives (however, compounds having two or more polymerizable unsaturated bonds in the molecule) or high molecular weight crosslinking agent 0.5 to 50 parts by weight, preferably 1 to 40 parts by weight,
It is more preferable that it contains.
Furthermore, a polymerization initiator can be contained, which is 0.01 to 5 parts by weight, further 0.01 to 3 parts by weight, in particular 0.5 to 2 parts by weight (the photopolymerization initiator is preferably 0 0.1-5 parts by weight, more preferably 0.3-3 parts by weight, particularly preferably 0.5-2 parts by weight, and the thermal polymerization initiator is preferably 0.01-1 part by weight, more preferably 0 .01 to 0.5 parts by weight, when a photopolymerization initiator and a thermal polymerization initiator are used in combination, each is preferably used within these ranges), and is preferably used in combination with the above components. It is preferable to use it at 100 parts by weight.

  In the above blending, blending of acrylic acid derivatives (however, compounds having two or more polymerizable unsaturated bonds in the molecule) or a high molecular weight crosslinking agent is used in an amount of 1 part by weight or more when a high molecular weight crosslinking agent is used. It is preferable to use 5 parts by weight or more, and acrylic acid derivatives (particularly low molecular weight monomers) are preferably 10 parts by weight or less.

（ただし、式中、ｍは２、３又は４、ｎは１〜１０の整数をしめす。）
で表されるヒドロキシル基含有アクリレート（以下、ＨＡモノマーという。）１３〜５０重量％（好ましくは、３０〜４０重量％）を重合させて得られるものである。 As the acrylic acid derivative polymer, an acrylic acid derivative copolymer described below is particularly preferable.
This copolymer has an alkyl acrylate having an alkyl group having 4 to 18 carbon atoms (hereinafter referred to as AA monomer) in an amount of 50 to 87% by weight (preferably 60 to 70% by weight) and the following general formula (I):

(In the formula, m represents 2, 3 or 4, and n represents an integer of 1 to 10.)
It is obtained by polymerizing 13 to 50% by weight (preferably 30 to 40% by weight) of a hydroxyl group-containing acrylate (hereinafter referred to as HA monomer).

  As the compound having one polymerizable unsaturated bond in the molecule, a compound having one acryloyl group in the molecule is preferable, and this also includes 50 to 87% by weight of AA monomer (especially 60 to 70% by weight). %) And HA monomer are preferably used in a proportion of 13 to 50% by weight (particularly 30 to 40% by weight).

の関係があるように配合されることが、特に好ましい。（Ｐ−Ｍ）が上記の式を満足しない場合、硬化時に本発明に係る衝撃吸収材が白濁しやすくなる。前記コポリマー及びアクリロイル基を分子内に１個有するモノマーにおいて、ＡＡモノマー（及びＨＡモノマー）が、上記した割合にあるときは、常にこの条件を満足する。 Also, between the proportion of HA monomer in the copolymer (P wt%) and the proportion of HA monomer in the compound having one acryloyl group in the molecule (M wt%),

It is particularly preferable that they are blended so that When (PM) does not satisfy the above formula, the shock absorber according to the present invention tends to become cloudy during curing. In the copolymer and the monomer having one acryloyl group in the molecule, this condition is always satisfied when the AA monomer (and the HA monomer) are in the above-described proportion.

  Examples of the AA monomer include n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, stearyl acrylate, and the like. , Isooctyl acrylate, 2-ethylhexyl acrylate, and n-octyl acrylate are preferable, and ethylhexyl acrylate is particularly preferable. These acrylates may be used in combination of two or more.

  Examples of the HA monomer include 2-hydroxyethyl acrylate, 1-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 1-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 3-hydroxybutyl acrylate, 2 -Hydroxyl-containing acrylates such as hydroxybutyl acrylate and 1-hydroxybutyl acrylate, polyethylene glycol monoacrylates such as diethylene glycol and triethylene glycol, polypropylene glycol monoacrylates such as dipropylene glycol and tripropylene glycol, dibutylene glycol and tributylene glycol Of polybutylene glycol monoacrylate and the like. Ethyl acrylate, 1-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 1-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 3-hydroxybutyl acrylate, 2-hydroxybutyl acrylate, 1-hydroxybutyl acrylate Is preferred, and 2-hydroxyethyl acrylate is particularly preferred. These acrylates may be used in combination of two or more.

  The copolymer obtained by polymerizing the AA monomer and the HA monomer in the present invention has a weight average molecular weight (measured using a standard polystyrene calibration curve by gel permeation chromatography, the same shall apply hereinafter) of 100,000 to 600, 000 is preferable, 150,000 to 400,000 is more preferable, and 200,000 to 350,000 is more preferable.

  As a method for synthesizing the copolymer, known polymerization methods such as solution polymerization, suspension polymerization, emulsion polymerization and bulk polymerization can be used, but solution polymerization or bulk polymerization is preferable. As the polymerization initiator, a compound capable of generating radicals by heat can be used. Specifically, benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n- Propyl peroxydicarbonate, di (2-ethoxyethyl) peroxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxybivalate, (3,5,5-trimethylhexanoyl) peroxide, di Organic peroxides such as propionyl peroxide, diacetyl peroxide, didodecyl peroxide, 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1, 1'-azobis (cyclohexane-1-carbonyl). 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2′-azobis (2-methylpropionate) ), 4,4′-azobis (4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) ) Propane].

The acrylic acid derivative polymer or acrylic acid derivative copolymer is preferably used for improving mechanical properties. Moreover, hardening shrinkage | contraction can be suppressed by using the said copolymer.
Acrylic acid derivatives (however, a compound having one polymerizable unsaturated bond in the molecule or a compound having one acryloyl group in the molecule) can be used to adjust the viscosity of the composition. An acrylic acid derivative (however, a compound having two or more polymerizable unsaturated bonds in the molecule or a compound having two or more acryloyl groups in the molecule) or a high molecular weight crosslinking agent retains the shape of the cured product of the composition. Preferably used above.
In addition, in the acrylic acid derivative copolymer and the compound having one acryloyl group in the molecule, if the AA monomer is too much, and therefore if the HA monomer is too little, the cured product tends to become cloudy when it absorbs moisture, On the other hand, if the HA monomer is too much, and therefore if the AA monomer is too little, the cured product of the shock absorbing material according to the present invention is likely to be deformed when moisture is absorbed.
If the polymerization initiator is too small, the reaction does not proceed sufficiently. Conversely, if the polymerization initiator is too large, a large amount of the polymerization initiator remains, causing problems in optical characteristics and mechanical characteristics. In addition, when hardening such a composition by irradiation of an electron beam, it is not necessary to use a photoinitiator.

The acrylic acid derivative (however, a compound having two or more polymerizable unsaturated bonds in the molecule) is also preferably a compound having two or more acryloyl groups in the molecule as polymerizable unsaturated bonds.
Examples of the compound having two or more acryloyl groups in the molecule include bisphenol A diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, 1,3- Butylene glycol diacrylate, diethylene glycol diacrylate, tripropylene glycol diacrylate, glycerol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, polybutylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol tri Acrylate, tris (acryloxyethyl) isocyanurate, pentaerythritol tetraacrylate, Examples include acrylate monomers such as pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, and acrylic oligomers such as epoxy acrylate, polyester acrylate, urethane acrylate, and acrylic acrylate, but 1,6-hexanediol diacrylate, Diacrylates such as 1,9-nonanediol diacrylate, tripropylene glycol diacrylate, polyethylene glycol diacrylate, and polypropylene glycol diacrylate are preferred. In addition, compounds having two or more acryloyl groups in the molecule can be appropriately selected from the compounds having two or more polymerizable unsaturated bonds in the molecule.
The high molecular weight crosslinking agent preferably also has an acryloyl group as a polymerizable unsaturated bond.

の関係があるように配合されてなるものが、特に好ましい。
ここで、光重合開始剤としては、前記したものが使用できる。光重合開始剤は、より好ましくは、０．５〜２重量部使用される。また、必要に応じて、熱重合開始剤を含有していてもよい。熱重合開始剤は、上記の配合において、好ましくは、０重量部又は１重量部以下の範囲で、より好ましくは、０重量部又は０．５重量部以下の範囲で使用される。上記高分子量架橋剤は、重合性不飽和結合としてアクリロイル基を有していることが好ましい。 As the liquid transparent filler in the present invention,
Acrylic acid derivative copolymer 15-60 parts by weight Acrylic acid derivative (however, a compound having one acryloyl group in the molecule)
39-84.2 parts by weight Acrylic acid derivative (however, a compound having two or more acryloyl groups in the molecule) or a high molecular weight crosslinking agent 0.5-10 parts by weight and a photopolymerization initiator 0.3-3 parts by weight Containing
The copolymer is obtained by polymerizing AA monomer 50 to 87% by weight (particularly 60 to 70% by weight) and HA monomer 13 to 50% by weight (particularly 30 to 40% by weight),
As a compound having one acryloyl group in the molecule, the AA monomer is 50 to 87% by weight (especially 60 to 70% by weight) and the HA monomer is 13 to 50% by weight (particularly 30 to 40% by weight). Used to be
Between the proportion of HA monomer in the copolymer (P wt%) and the proportion of HA monomer in the compound having one acryloyl group in the molecule (M wt%),

Those blended so as to have the following relationship are particularly preferred.
Here, as the photopolymerization initiator, those described above can be used. More preferably, the photopolymerization initiator is used in an amount of 0.5 to 2 parts by weight. Moreover, you may contain the thermal-polymerization initiator as needed. In the above blending, the thermal polymerization initiator is preferably used in the range of 0 part by weight or 1 part by weight or less, more preferably 0 part by weight or 0.5 part by weight or less. The high molecular weight crosslinking agent preferably has an acryloyl group as a polymerizable unsaturated bond.

  In the present invention, the liquid transparent filler preferably does not contain a non-reactive solvent. If the liquid transparent filler contains a non-reactive solvent, it must be removed by post-treatment such as heating, pressurization, vacuum degassing, and drying after the protective panel and liquid crystal panel are brought into close contact with each other through the transparent filler. It becomes. If not removed, adhesion will be reduced and long-term reliability will be impaired.

  In the present invention, it is preferable to add an additive having an antifoaming effect to the liquid transparent filler. Further, a surfactant that controls wettability with the liquid crystal panel surface or the protective panel surface may be added. Moreover, you may put a plasticizer with little volatility. The amount of these additives used is not particularly limited as long as the display performance and reliability of an image display panel in which a transparent filler is closely disposed between the liquid crystal panel and the protective panel are not adversely affected.

  These liquid transparent fillers can be disposed in close contact between the image display panel and the protective panel, and can be formed through a solidification process.

  The frame material is, for example, formed into a frame shape according to the size and shape of the outer edge of the display display part, and formed into a thickness according to the distance between the display panel and the protective panel, or formed into a sheet shape It is possible to use a frame-shaped material obtained by punching or cutting, or a band-shaped or tape-shaped material slit to a desired width according to the length of the edge. Even if the frame material is accompanied by deformation, it can be used as long as it is fixed to a desired thickness in the final product.

  The desired thickness refers to a thickness that matches the gap between the protective panel and the image display panel. For example, a rubber-like or sponge-like porous body (having open cells) can also be used. This is because when the liquid transparent resin is soaked into the porous body and solidified or cured, the shape is fixed. However, in the case of deformation, the porosity (R%) described later is the porosity after deformation / compression. The thickness, porosity, and amount of liquid transparent filler are determined in anticipation of deformation in accordance with the weight of the protective panel and the housing (housing). In some cases, in order to fix the thickness, a spacer can be provided using a material that is not accompanied by deformation in addition to the frame material. Even if it is not molded into a sheet, powder or liquid oil-absorbing material is blended into a highly viscous paste or ink, for example, and installed on the edge using a method such as printing or transfer. (Applying and drying) can also be used as a frame material.

  As the material, a material having a large number of voids through which air can pass is used. The voids are preferably distributed throughout. As a frame material of the present invention, a porosity of 20 to 98% is necessary to improve the amount of resin absorption. More preferably, the porosity is 40 to 95%, and particularly preferably 50 to 95%. If the porosity is less than 20%, the resin absorbability decreases, and if it exceeds 98%, the frame material is easily broken, which is not suitable for practical use.

  By enclosing the outer periphery with a large number of voids as a frame material, it is not necessary to reduce the pressure by capillary action, and the liquid can be quickly moved to the outer periphery. The bubble entrainment can be moved to the outer peripheral portion in a short time and eliminated from the visual recognition portion.

  However, the porosity means the ratio of the portion other than the frame material (resin, fiber, etc.) in the outer volume occupied by the frame material, that is, the ratio of the air portion in a normal dry state. When the void means a fine structure (hole) constituting the porous body, a pore distribution measuring device can be used as a device for measuring this. There are two types of devices for measuring the pore diameter: mercury intrusion porosimeter and gas adsorption measuring device. Mercury intrusion porosimeter is large when the sample is immersed in mercury and pressure is applied from the surroundings. Measured using the property of mercury intrusion from the hole. On the other hand, in gas adsorption measurement, when a sample in a vacuum vessel is cooled with liquid nitrogen together with the vessel and a known amount of nitrogen gas is injected, nitrogen gas undergoes physical adsorption on the sample surface to form a molecular layer, The pore distribution is measured by utilizing the property of agglomerating in order from small holes. (Maruzen Co., Ltd. Chemistry Seminar 16, Adsorption Science, Kyoritsu Zensho 157 Adsorption) When voids mean gaps, for example, voids that occur when fibers are bundled, porosity is the outer volume of fibers bundled. Is the ratio of the remaining volume minus the volume (which can be determined from its weight and density) to the outer volume. As a method of binding the fibers, the fibers may be bound with a thread-like material, a belt-like material, the fibers may be partially fused to each other, or a woven fabric or a non-woven fabric may be used.

  Examples of frame materials are those that have the ability to absorb liquid transparent resins, such as “Development of oil-absorbing materials” (May 1991 “Development and application of oil-absorbing materials” popular version, CMC Co., Ltd.) As described in the publication), and a member containing an oil-absorbing material such as an amorphous silica, a kapok fiber, a gelling agent, and an oil adsorbing material. In terms of shape, for example, an open-cell porous sheet, a non-woven sheet, a woven fabric, and the like can be given.

  Examples of the material of the open-cell porous sheet include polyvinyl alcohol, polyurethane, polypropylene, and polyethylene.

  Examples of fibers used in the nonwoven sheet or woven fabric include cellulosic fibers and synthetic fibers. Examples of the cellulosic fibers include cotton, pulp, rayon, cupra, lyocell, and kapok. In particular, pulp is preferable from the viewpoint of water absorption performance and cost. Examples of the pulp include kraft pulp (KP) obtained from pulp chips such as hardwoods and conifers. Moreover, as a synthetic fiber, what consists of high molecular compounds, such as polyolefin, such as polyethylene and a polypropylene, polyesters, such as a polyethylene terephthalate, nylon, and polyvinyl chloride, is mentioned. From the viewpoints of safety, processability, price, etc., olefin fibers and polyester fibers are preferred.

  The protective panel and transparent filler of the present invention include phenolic, phosphite-based, thioether-based antioxidants, aliphatic alcohols, fatty acids from the viewpoints of prevention of deterioration, thermal stability, moldability, and processability. Release agents such as esters, phthalates, triglycerides, fluorosurfactants, higher fatty acid metal salts, other lubricants, plasticizers, antistatic agents, UV absorbers, flame retardants, heavy metal deactivators, alumina, Fine particles such as silica, magnesium oxide, talc, barium titanate and barium sulfate, dyes such as Victoria Pure Blue, and colorants such as pigments such as phthalocyanine green may be added and used.

  As for the method of installing the frame material on the image display panel or the protection panel, at least one of them is placed by its own weight on the surface to which these panels should face, or fixed with an adhesive or an adhesive. It can be carried out. Preferably, when an adhesive having a composition similar to that of the transparent filler is used as an adhesive, peeling from the interface can be prevented. Even if the material used as the frame material is not molded into a sheet shape, a powdery or liquid oil-absorbing material is blended in, for example, a highly viscous paste or ink, and a method such as a printing method or a transfer method is used. And it can also arrange | position as a frame material by apply | coating to an outer peripheral part. The frame member can be installed on the surfaces of both the image display panel and the protection panel that should face each other. When the frame material is installed on the image display panel, it is preferable to install it on a transparent base material. However, when the casing is already incorporated, it may be installed on the casing. Is preferably located near the periphery of the image viewing portion.

  The shape of the frame material may be molded or punched into a sheet shape, and may be adjusted to the shape of the outer periphery of the image display panel, or the tape shape may be cut into a plurality of pieces as necessary. Good. The thickness of the frame material is preferably equal to the thickness of the transparent filler. However, when a cushioning material is used, it may be sandwiched between panels and pressed to make the thickness uniform. The width of the frame member is preferably 2 mm to 50 mm, and can be arbitrarily selected depending on the amount of resin and installation space.

  An example of a method for manufacturing a liquid crystal display device of the present invention is shown in a perspective view in FIG. When the liquid crystal display device of the present invention is manufactured, the liquid transparent filler 11 a is filled in the space 8 to be surrounded by the image display panel 6 or the protection panel 7 and the frame member 10.

Hereinafter, the volume of the transparent filler liquid used L, the liquid crystal panel 6, V ₁ the volume of the space 8 enclosed by the protection panel 7 and frame member _10, the frame member 10 to be used for manufacturing a liquid crystal display device the void volume and _{V 2.} V ₂ can be obtained as the product (V _f × R / 100) of the volume (V _f ) of the frame member 10 used for manufacturing and its porosity (R%).

The above L is preferably V ₁ or more. L may be a volume corresponding to at least the range covering the transparent viewing window, but if it is smaller, it cannot be said that there is no possibility of entraining bubbles. Therefore, it is more preferably V ₁ × 1.1 or more. . If there is a precise dispensing device may be a V ₁ it was in principle. If it is V ₁ or more and further exceeds (V ₁ + V ₂ ), the liquid filler will ooze out of the frame material. Resin exuded by curing the exuded resin and sealing the periphery with a curable resin having a sealing property and adhesiveness, a thermoplastic resin, a photocurable resin, an adhesive tape, etc. However, it is preferable to prevent the liquid filler from oozing out of the frame material by setting L to (V ₁ + V ₂ ) or less. In addition, when using the sheet-like transparent filler mentioned later, the volume L of a liquid transparent filler is the volume of the sheet-like transparent filler which fits in the space 8 enclosed by the liquid crystal panel 6, the protective panel 7, and the frame material 10. It is preferable to further reduce the value.

  As a manufacturing operation, the frame member 10 is installed on the protective panel 7, and the liquid filler 11 a is injected into a portion corresponding to the space 8. This injection is preferably performed at the center of the protective panel 7 constituting a part of the space 8. After injecting the liquid filler 11a and before it completely extends (preferably at a stage where the liquid filler 11a has not yet extended in a state where the liquid filler 11a has risen after injection), the liquid crystal panel 6 is in a liquid filler. It is mounted so that it may become a predetermined | prescribed arrangement | positioning with respect to the protection panel 7 or the frame material 10 from 11a. The liquid crystal panel 6 is arranged at a predetermined position by pressing or by its own weight. As a result, the liquid transparent filler is spread while being pressed, soaks in the air while extruding the air in the gap, and after the liquid crystal panel has been disposed at a predetermined position, solidification by cooling, heating or light is applied. Curing by irradiation is performed. At this point, the transparent filler is in close contact with the liquid crystal panel 6 and the protective panel 7. As a method for injecting the liquid transparent filler, there is a method such as a method of dropping a predetermined amount from the discharge port onto the protective panel or the liquid crystal panel using, for example, an automatic or manual dispenser.

  Moreover, in this invention, it is also possible to use a sheet-like transparent filler together. As the sheet-like transparent filler, a solidified liquid transparent filler can be used.

  As a method for producing the sheet-like transparent filler of the present invention, a polymer synthesized by thermal polymerization such as bulk polymerization, suspension polymerization, emulsion polymerization and solution polymerization is used to produce a sheet by a melt processing method or a melt casting method. Conventionally known production methods such as a method and a method of producing a sheet by heat polymerization or photopolymerization directly in a lump or solution form can be applied.

In particular, when using a method of producing a sheet form by thermal polymerization or photopolymerization in bulk or solution, the weight average molecular weight of the (co) polymer (measured using a standard polystyrene calibration curve by gel permeation chromatography) In the following, the same applies to 100,000 to 600,000, and the blending amount is preferably 10 to 60% by weight. If there is a copolymer originally contained, it is also included and has a weight average molecular weight.
As a synthesis method of the (co) polymer, known polymerization methods such as solution polymerization, suspension polymerization, emulsion polymerization and bulk polymerization can be used, but solution polymerization or bulk polymerization is preferable.

  The composition of the raw material of the liquid transparent filler and the sheet-like transparent filler may be the same or different, but when the composition is different, when the liquid transparent filler is finally solidified, If the refractive index is different from that of the sheet-like transparent filler, reflection occurs at the interface. In this case, the difference in refractive index is preferably 0.2 or less.

  The sheet-like transparent filler is preferably pasted on the protective panel side or the image display panel in advance. The sheet-like transparent filler can be attached to the protective plate or the liquid crystal panel by a conventionally known method using a roll laminator or a single wafer bonding machine without leaving bubbles.

  When a sheet-like transparent filler is used in combination, the ratio with the volume of the liquid transparent filler is not particularly limited. The thickness of the sheet-like transparent filler is not limited as long as it does not exceed the thickness of the frame material. However, when the thickness is increased, there is no space for the liquid transparent filler to enter, and it becomes difficult to expel bubbles.

  The area of the sheet-like transparent filler is preferably larger than the area of the image viewing surface because the boundary between the sheet-like filler and the liquid filler does not appear on the viewing surface. It is desirable to apply the sheet-like filler to the protective panel, the image display panel, or both before spreading the liquid transparent filler, but after applying the transparent filler to one or both panels It may be installed on top of it. That is, in order to prevent bubbles from entering the interface between panels to be finally bonded, a liquid transparent filler may be interposed at the interface.

  FIG. 4 is a cross-sectional view showing an example of the image display device of the present invention when a sheet-like transparent filler is used. As a practical size, the length of the diagonal line is 2 inches (about 50 mm) to 42 inches (about 1050 mm). A frame member 10 is installed between the liquid crystal panel 6 and the protective panel 7, and a space defined by these is composed of a transparent filler 11 a ′ obtained by solidifying a liquid transparent filler and a sheet-like transparent filler 11 b. The transparent filler is filled, and this transparent filler is closely attached to the liquid crystal panel 6 and the protective panel 7. The sheet-like transparent filler 11 b is in close contact with the liquid crystal panel 6 in advance and has a size smaller than the volume of the space defined by the liquid crystal panel 6, the protection panel 7, and the frame member 10. The thickness of the sheet-like transparent filler 11 b is smaller than the gap (thickness direction) between the liquid crystal panel 6 and the protective panel 7, and the plane size may be smaller than the range surrounded by the frame material 10. preferable. The same applies to the case where the sheet-like transparent filler 11b is previously installed on the protective panel 7. Similarly, when the sheet-like transparent filler 11b is installed on both the liquid crystal panel 6 and the protective panel 7, the total thickness of the sheet-like transparent filler is the gap between the liquid crystal panel 6 and the protective panel 7 (thickness). It is preferable that the size of each plane is smaller than the range surrounded by the frame member 10. A preferable thickness may be 90% or less of the gap between the liquid crystal panel 6 and the protective panel 7. The size of a preferable plane should just be below the magnitude | size which added the frame material part to the visual recognition part of the protection panel. Further, the manufacturing in this case is the same as that in the example of FIG. When a sheet-like transparent filler is used, its thickness and size are the same as in the case of this liquid crystal display device. The liquid crystal panel may be replaced with an image display panel for reading.

  In the method for manufacturing an image display device of the present invention, as described above, after injecting a liquid transparent filler into one of the image display panel or the protection panel on which the frame material is installed, the image display panel or the protection panel Is placed on it. In the present invention, the liquid transparent filler has a viscosity of 10,000 mPa · s or less (E-type viscometer (for example, e.g. TV-33 manufactured by Tokyo Keiki Co., Ltd. can be used), and the viscosity at a temperature of 25 ° C. (the same applies hereinafter) is preferred, but the liquid is transparently filled by the weight of the image display panel or protective panel without any particular pressure. In order to develop the material, the viscosity of the liquid transparent filler is preferably 500 to 5,000 mPa · s. However, after filling one of the image display panel or the protection panel on which the frame material is installed with the liquid transparent filler, the other of the image display panel or the protection panel is placed on the panel or at the same time or thereafter. May be pressed. In this case, the viscosity of the liquid transparent filler to be developed for this purpose can be made higher than that described above, and is preferably 3,000 to 10,000 mPa · s. When the liquid transparent filler is developed by its own weight or pressing of the image display panel or the protective panel, if it is sufficiently developed and the filler is infiltrated into the frame material, the solidification (or curing) partially proceeds. Alternatively, it may be solidified (or cured) after the development of the liquid transparent filler is completed.

  Moreover, when using together a sheet-like transparent filler, the viscosity of 1-500 mPa * s is preferable from the ease of expansion | deployment.

  The frame member can also be provided on the surface of the other image display panel or protection panel that faces the one image display panel or protection panel. At this time, the frame material provided on the other image display panel or the protection panel may be arranged so as to match the size of the frame material provided on the one image display panel or the protection panel. The frame members may be fitted inside and outside or half inside and outside each other, and the way of fitting is arbitrary.

  FIG. 5 is a cross-sectional view showing an example of an image display device according to the present invention. The liquid crystal panel 6 is installed in the housing 12, and the frame member 10 is fixed to the housing 12. The liquid crystal panel 6 and the image display panel including the housing 12, the frame member 10, and the protection panel 7 A transparent filler 11 is filled in the enclosed space. That is, the frame material may be fixed so that the liquid transparent filler filled between the protective panel and the image display panel can come into contact with the frame member.

  In the present invention, when the image display panel and the protective panel are bonded together via the transparent filler, by expanding the liquid transparent filler as described above, air can be exhausted from the frame material. It is easy to remove air (erase bubbles) from the transparent viewing portion. Further, since the frame material has a large number of voids, the liquid transparent filler can be rapidly developed. Further, when the frame material is oil-absorbing, air can be discharged more easily (without applying excessive pressure).

  In the present invention, in the liquid crystal display device described above, after the manufacture, a part of the frame material is pulled out to easily remove the cured transparent resin and the frame material that is not cured and not adhered. You can also For example, if the frame material has solubility, the portion sandwiched between the panels can be removed by dissolving with a soluble solvent. When a photocurable resin composition is used as the transparent filler, if the actinic ray is blocked by a light-shielding mask, the filler impregnated in the frame material portion is uncured, that is, liquid and easy to remove.

  FIG. 6 is a cross-sectional view showing an example of an image display device according to the present invention. A frame member 10 is installed on the periphery of the protective panel 7, an image display panel (for example, a liquid crystal display panel) 6 that is smaller than the protective panel 7 in area is stacked, and a transparent filler 11 is filled in a space surrounded by these. ing. The frame material protruding from the image display panel 6 can be cut and removed to leave a part. There is no problem if the frame material is removed after leaving the bubble, or left as it is, but in particular, there is a requirement to narrow the peripheral part (by reducing the part other than the visual recognition part, it is lighter, smaller, aesthetic, If there is a purpose to improve the design), it can be removed.

  Into a reaction vessel equipped with a condenser, a thermometer, a stirrer, a dropping funnel and a nitrogen injection tube, 100 parts by weight of 2-ethylhexyl acrylate and 80 parts by weight of toluene were placed, and while bubbling nitrogen at a volume of 100 ml / min, toluene 20 0.5 part by weight of azobisisobutyronitrile dissolved in parts by weight was added dropwise. After completion of the dropping, a polymerization reaction was carried out at 70 ° C. for 2 hours. Thereafter, toluene was removed to obtain a 2-ethylhexyl acrylate polymer having a weight average molecular weight of 200,000.

  49.5 parts by weight of the obtained 2-ethylhexyl acrylate polymer, 49.5 parts by weight of 2-ethylhexyl acrylate, 1.0 part by weight of 1,6-hexanediol diacrylate, Irgacure 184 (product of Ciba Specialty Chemicals Co., Ltd.) Name) 0.5 part by weight was added and stirred to obtain a uniform solution (viscosity 2900 mPa · s) to obtain a liquid transparent filler.

On a protective panel [2 mm thick glass plate (40 mm × 50 mm)], an open cell polyvinyl alcohol sponge (product name; Berglin D-1, manufactured by Aion Co., Ltd.) having a porosity of 89% and a thickness of 1 mm is 4 mm wide. The frame material cut out by cutting to an inner dimension of 30 mm x 40 mm and an outer dimension of 38 mm x 48 mm is fixed so that the outer side is 10 mm from the frame material of the glass plate, and is left to stand horizontally. A liquid transparent filler (1.7 ml) was poured into it with a manual dispenser. When the transparent filler expands in a circular shape, and a part of the transparent filler is in contact with the frame material, a liquid crystal display panel (35 mm x 45 mm) is superimposed on it. The upper part was developed while being pressed by the liquid crystal display panel by its own weight, and filled into a space formed by the glass plate, the liquid crystal panel, and the frame material. At this time, the liquid transparent filler was soaked in the entire circumference of the frame material. Subsequently, the transparent filler including the part impregnated in the frame material was cured and solidified by irradiating the ultraviolet ray with ² J / cm ² from the glass plate side using an ultraviolet irradiation device to obtain a liquid crystal display device.
However, at this time, V ₁ = 1.2 ml, V _f = 0.62 ml, R = 89%, and V ₁ + V _f × (R / 100) = 1.76 ml. 7 ml is in the range of V ₁ ≦ L ≦ V ₁ + V _f × (R / 100).

  In the above liquid crystal display device, the frame material is irradiated with ultraviolet rays with a light-shielding mask on the front surface, and the filler impregnated in the frame material is uncured, and the frame material is peeled off from the portion protruding from the panel. The liquid crystal display device showed the same characteristics as the above. Even if the frame material was removed after removing the bubbles or left as it was, the display characteristics of the visual recognition part did not change.

A liquid crystal display device was obtained in the same manner as in Example 1 except that an open-cell polyurethane sponge (product name: Soflas, manufactured by Aion Co., Ltd.) having a porosity of 83% and a thickness of 1 mm was used as the frame material.
At this time, V ₁ + V _f × (R / 100) = 1.72 ml.

Other than using open-cell polyethylene sponge (product name: Filterlen Sheet F-100, manufactured by Filterlen Co., Ltd.) having a porosity of 53% and a thickness of 0.8 mm as the frame material, the resin filling amount L is 1.2 ml. Obtained a liquid crystal display device according to Example 1.
At this time, it was V ₁ + V _f × (R / 100) = 1.22 ml.

According to Example 1, except that a polypropylene nonwoven fabric (product name; Splytop SP-1100N, manufactured by Nippon Nonwoven Co., Ltd.) having a porosity of 70% and a thickness of 1 mm was used as the frame material, and the resin filling amount L was 1.5 ml. Thus, a liquid crystal display device was obtained.
At this time, it was V ₁ + V _f × (R / 100) = 1.63 ml.

  A liquid crystal display device was obtained in the same manner as in Example 1 except that the resin filling amount L was 1.3 ml.

(Comparative Example 1)
A liquid crystal display device was obtained in the same manner as in Example 1 except that a silicone rubber sheet (manufactured by Tigers Polymer) having a porosity of 0% was used as the frame material. Compared with Example 1, a large amount of the liquid transparent filler oozed out to the outer peripheral portion of the bonded panel. This portion was uncured due to oxygen inhibition and did not cure, was liquid, and remained sticky.

  In the liquid crystal display devices obtained in the examples and comparative examples, the material of the frame material, the (porosity) porosity, the filling amount of the liquid transparent filler are shown in Table 1, and between the liquid crystal display panel and the transparent protective plate Table 2 shows the results of evaluation of the mixing of bubbles and the curability of the exuded part.

Evaluation method (bubbles) Measure the number of bubbles with a maximum diagonal length of 20 μm or more that can be identified visually.
(Resin exudation) Visual evaluation.
Absorption: Exuded resin is all contained in the frame material.
Leakage: Exuded resin has flowed out of the frame.
(Exudation part curability) When the PET film is brought into contact with the surface of the frame material and the resin adheres to the PET film, it is judged as uncured.

  A liquid transparent filler was obtained using 0.1 parts by weight of dilauroyl peroxide (manufactured by NOF Corporation) instead of 0.5 parts by weight of Irgacure 184 in Example 1. Next, using this liquid transparent filler, the protective plate and the liquid crystal display panel were overlapped in the same manner as in Example 1. As in Example 1, the liquid transparent filler was infiltrated all around the frame material. . Subsequently, the transparent filler in the portion impregnated in the frame material was also cured and solidified by drying in a 70 ° C. blowing oven for 1 hour to obtain a liquid crystal display device. The same results as in Example 1 were obtained.

To the liquid transparent filler of Example 1, 0.1 part by weight of 2,2′-azobisisobutyronitrile was added, and the protective plate and the liquid crystal display panel were superposed in the same manner as in Example 1. Then, after irradiating ² J / cm ^{2 of} ultraviolet rays from the glass plate side using an ultraviolet irradiation device, the transparent filler in the portion impregnated in the frame material is cured by drying in a blowing oven at 70 ° C. for 1 hour. Solidified to obtain a liquid crystal display device. The same results as in Example 1 were obtained.

Schematic sectional view showing an example of a conventional liquid crystal display device. 1 is a cross-sectional view showing an example of a liquid crystal display device which is one of image display devices of the present invention. The perspective view which shows an example of the manufacturing method of the apparatus for liquid crystal displays of this invention. Sectional drawing which shows an example of the apparatus for image display of this invention at the time of using a sheet-like transparent filler. Sectional drawing which shows an example of the apparatus for image display of this invention. Sectional drawing which shows an example of the apparatus for image display of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass 2 Spacer 3 Liquid crystal 4 Liquid crystal display cell 5 Optical film 6 such as a polarizing plate Liquid crystal panel 7 Protective panel 8 Space 9 Backlight unit 10 Frame material 11 Transparent filler 11a Liquid transparent filler 11a 'Liquid transparent filler is solidified Transparent filler 11b sheet-like transparent filler 12 housing

Claims (9)

  In a manufacturing method of an image display device in which a transparent filler is closely disposed without an air layer between an image display panel and a protective panel installed in front of the image display panel, a large number of air can pass through A step of injecting a liquid transparent filler into the inner side surrounded by the frame material of one of the panel of the image display panel or the protective panel in which the frame material having a gap is installed, and the image display panel to the frame material Or the manufacturing method of the apparatus for image displays characterized by including the process of mounting the other panel of a protection panel, and the process of solidifying a liquid transparent filler.   2. The method for manufacturing an image display device according to claim 1, wherein the volume of the liquid transparent filler used is equal to or greater than the volume surrounded by the image display panel, the protection panel, and the frame material.   3. The image display device according to claim 1, wherein a volume of the liquid transparent filler used is equal to or less than a sum of a volume surrounded by the image display panel, the protection panel, and the frame material and a total gap of the frame material. Production method.   The liquid transparent filler contains a compound having an acrylic acid derivative polymer and one or more polymerizable unsaturated bonds in the molecule, and is polymerized by irradiation with heat or active light. A method for manufacturing the image display device according to claim 1.   The method for manufacturing an image display device according to claim 1, wherein the transparent filler has a total light transmittance of 50% or more.   The image display panel according to claim 1, wherein the frame member is an open-cell porous sheet.   The method for manufacturing an image display device according to claim 1, wherein a porosity of the frame material is 20% to 98%.   The manufacturing method of the apparatus for image display in any one of 1-7 including the process of removing a frame material after the process of solidifying a liquid transparent filler.   An image display device obtained by the method according to claim 1, wherein a frame material is impregnated with a transparent filler.

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