JP5295509B2 - Reinforcing sheet for image display device, image display device and method for reinforcing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing sheet for an image display, which is capable of easily and effectively reinforcing the image display, an image display provided with the reinforcing sheet for image display, and further, to provide a method for reinforcing the image display by means of the reinforcing sheet for an image display. <P>SOLUTION: In an image display 2 comprising an image display unit 3 and a casing 4, an reinforcement sheet 1 for an image display is taken and pasted by its resin layer 1A to the image display unit 3 and/or the casing 4, and the resin layer 1A is heated; wherein the reinforcement sheet 1 is provided with the resin layer 1A and a constraining layer 1B laminated thereon. Thus the strength of the area can be improved since the resin layer 1A closely adheres after heating and secures rigidity there. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an image display device reinforcement sheet for reinforcing an image display device, an image display device in which the image display device reinforcement sheet is disposed, and the image display device reinforcement sheet. The present invention relates to a method for reinforcing an image display device.

  An image display device equipped with an image display unit including a liquid crystal panel, a plasma display panel, an electroluminescence panel or the like usually includes various electric devices such as a computer display, a television, a mobile phone, and a game device, and has a wide range. Used in the field.

Such an image display device includes a frame that supports the image display unit. For example, it is proposed to reduce the weight of the device by forming the frame from a light metal such as aluminum instead of steel. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 2004-21104

  However, if the frame is made of a lightweight metal, the weight can be reduced as compared with steel, but there is a limit to reducing the weight when securing practical strength.

  Further, if the frame is made of a lightweight metal, the strength of the frame is weakened as a whole, and there is a risk that the strength may be insufficient at a portion that requires rigidity.

  On the other hand, it is possible to partially provide a reinforcing steel plate in a part that requires rigidity, but in order to provide such a reinforcing steel sheet, the reinforcing steel sheet is processed and assembled according to the part that requires rigidity. Is necessary and the work becomes complicated. In particular, in a complicated part, processing and assembly may be very complicated, or processing and assembly may not be possible.

  An object of the present invention is to provide a reinforcing sheet for an image display device that can easily and effectively reinforce the image display device, an image display device in which the reinforcing sheet for an image display device is disposed, and further An object of the present invention is to provide a method for reinforcing an image display device in which the image display device is reinforced by a reinforcing sheet for image display devices.

  In order to achieve the above object, the reinforcing sheet for an image display device of the present invention is characterized by comprising a resin layer and a constraining layer laminated on the resin layer.

  In the reinforcing sheet for an image display device of the present invention, it is preferable that the constraining layer is a glass cloth.

  In the reinforcing sheet for an image display device of the present invention, it is preferable that the resin layer contains an epoxy resin and a curing agent.

  In the reinforcing sheet for an image display device of the present invention, it is preferable that the resin layer further includes a foaming agent and can be foamed.

  In the reinforcing sheet for an image display device of the present invention, it is preferable that the resin layer further contains a synthetic rubber.

  In the reinforcing sheet for an image display device of the present invention, it is preferable that the synthetic rubber includes a styrene synthetic rubber and / or an acrylonitrile-butadiene rubber.

  In the reinforcing sheet for an image display device of the present invention, the resin layer preferably contains an ethylene copolymer, and further preferably contains a filler and a tackifier.

In the reinforcing sheet for an image display device of the present invention, the resin layer preferably has a Young's modulus at 23 ° C. of 1.0 × 10 ⁷ N / m ² or more.

  The image display device of the present invention is characterized in that the above-described reinforcing sheet for an image display device is disposed.

  The image display device reinforcing method of the present invention is characterized in that the above-described image display device reinforcing sheet is disposed on the image display device and the resin layer is heated.

  According to the reinforcing sheet for an image display device of the present invention and the method for reinforcing an image display device of the present invention, if the resin layer is disposed and heated in a portion requiring the rigidity of the image display device, the resin layer is in close contact with the portion. Therefore, the strength of the part can be improved. In addition, the adhered resin layer is lightweight, and an increase in the weight of the image display device can be effectively suppressed. Furthermore, since the closely adhered resin layer is constrained by the constraining layer, the strength of the constraining layer can be further improved while the resin layer is well retained.

  Therefore, the image display device of the present invention can obtain sufficient rigidity while being lightweight, and can improve durability.

  In particular, when the resin layer is placed and foamed at a site that requires the rigidity of the image display device, the resin layer can be a foamed layer, and sufficient rigidity is ensured as the thickness increases due to foaming. The strength of the part can be improved. In addition, the foamed layer is very light, and an increase in the weight of the image display device can be more effectively suppressed. Furthermore, after foaming, the foam layer is constrained by the constraining layer, so that the strength of the constraining layer can be further improved while the foam layer is well retained.

  The reinforcing sheet for an image display device of the present invention includes a resin layer and a constraining layer laminated on the resin layer.

  In the present invention, the resin layer is formed by molding the resin composition into a sheet shape.

  The resin composition is not particularly limited as long as it contains at least a resin component, but optionally contains a curing agent, a crosslinking agent, a foaming agent, and the like depending on the type of the resin component.

  Although it does not restrict | limit especially as a resin component, For example, a thermosetting resin and a thermoplastic resin are mentioned.

  Although it does not restrict | limit especially as a thermosetting resin, For example, an epoxy resin and a synthetic rubber are mentioned.

  The epoxy resin is not particularly limited, and examples thereof include aromatic epoxy resins, aliphatic / alicyclic epoxy resins, and nitrogen-containing ring epoxy resins.

  The aromatic epoxy resin is an epoxy resin in which a benzene ring is included in a molecular chain as a structural unit, and is not particularly limited. For example, bisphenol A type epoxy resin, dimer acid-modified bisphenol A type epoxy resin, bisphenol Bisphenol type epoxy resins such as F type epoxy resin and bisphenol S type epoxy resin, for example, novolak type epoxy resins such as phenol novolak type epoxy resin and cresol novolak type epoxy resin, for example, naphthalene type epoxy resin, for example, biphenyl type epoxy resin Etc.

  Examples of the aliphatic / alicyclic epoxy resin include hydrogenated bisphenol A type epoxy resin, dicyclo type epoxy resin, and alicyclic type epoxy resin.

  Examples of the nitrogen-containing ring epoxy resin include triglycidyl isocyanurate epoxy resin and hydantoin epoxy resin.

  These epoxy resins may be used alone or in combination. Among these epoxy resins, aromatic epoxy resins and aliphatic / alicyclic epoxy resins are preferably used, and bisphenol type epoxy resins and alicyclic epoxy resins are more preferably used in consideration of reinforcement.

  Further, such an epoxy resin has an epoxy equivalent of, for example, 150 to 350 g / eq when the resin layer can be foamed, and when the resin layer is curable, for example. Is preferably 450 to 1000 g / eq. The epoxy resin is preferably liquid at normal temperature (23 ° C.), and preferably has a viscosity of 250 dPa · s / 25 ° C. or lower in order to develop good adhesiveness at low temperatures.

  The synthetic rubber is preferably used in combination with an epoxy resin and is not particularly limited, and examples thereof include styrene synthetic rubber and acrylonitrile-butadiene rubber (NBR: acrylonitrile-butadiene copolymer).

  The styrene synthetic rubber is a synthetic rubber in which at least styrene is used as a raw material monomer, and is not particularly limited. For example, styrene / butadiene random copolymer, styrene / butadiene / styrene block copolymer, styrene / Examples thereof include styrene / butadiene rubbers such as ethylene / butadiene copolymers and styrene / ethylene / butadiene / styrene block copolymers, and styrene / isoprene rubbers such as styrene / isoprene / styrene block copolymers.

  These may be used alone or in combination. Among these styrene-based synthetic rubbers, styrene / butadiene rubber is preferably used in consideration of reinforcement and adhesiveness.

  The styrene synthetic rubber has a styrene content of preferably 50% by weight or less, and more preferably 35% by weight or less. When there is more styrene content than this, the adhesiveness in low temperature may fall.

  The styrene synthetic rubber has a number average molecular weight of 30,000 or more, preferably 50,000 to 1,000,000. If the number average molecular weight is less than 30,000, the adhesive strength may be reduced.

  The styrene synthetic rubber has a Mooney viscosity of, for example, 20 to 60 (ML1 + 4, at 100 ° C.), preferably 30 to 50 (ML 1 + 4, at 100 ° C.).

  Moreover, the compounding ratio of a styrene synthetic rubber is 30-70 weight part with respect to 100 weight part of resin components, Preferably, it is 40-60 weight part. If the blending ratio of the styrene synthetic rubber is less than this, the adhesiveness may be lowered. On the other hand, if it is more than this, the reinforcing property may be lowered.

  When a styrene synthetic rubber is blended as the synthetic rubber, an epoxy-modified styrene synthetic rubber is preferably used in combination as the synthetic rubber. By using epoxy-modified styrene synthetic rubber in combination, compatibility between styrene synthetic rubber and epoxy resin, especially aromatic epoxy resin can be improved, and further improvement in adhesion and reinforcement Can do.

  As the epoxy-modified styrene synthetic rubber, for example, a synthetic rubber in which an epoxy group is modified at a molecular chain terminal or molecular chain such as the above-described styrene synthetic rubber, the epoxy equivalent of which is, for example, 100 to 100 Those of 10,000 g / eq, more preferably 400 to 3000 g / eq are preferably used.

  In order to modify the styrene synthetic rubber with an epoxy group, a known method is used. For example, in an inert solvent, a double bond in the styrene synthetic rubber is bonded to a peracid or a hydroperoxide. The epoxidizing agent is reacted.

  Examples of such an epoxy-modified styrene synthetic rubber include an AB block copolymer and an ABA block copolymer (A represents a styrene polymer block, B represents a butadiene polymer block, A conjugated diene polymer block such as an isoprene polymer block is shown.) In the B polymer block, an epoxy group is introduced.

  More specifically, examples include an epoxy-modified styrene / butadiene / styrene block copolymer, an epoxy-modified styrene / ethylene / butadiene / styrene block copolymer, and an epoxy-modified styrene / isoprene / styrene block copolymer.

  These may be used alone or in combination. Among these epoxy-modified styrene-based synthetic rubbers, an epoxy-modified styrene / butadiene / styrene block copolymer is preferably used in consideration of both reinforceability and adhesiveness.

  In the above AB block copolymer or ABA block copolymer, the A block copolymer which is a styrene polymer block preferably has a weight average molecular weight of 1000 to 10,000. The B block copolymer that is a conjugated diene polymer block preferably has a weight average molecular weight of about 10,000 to 500,000, and has a glass transition temperature of about 7 ° C. or more. The temperature is −20 ° C. or lower. The weight ratio of the A block copolymer to the B block copolymer is preferably 2/98 to 50/50, more preferably 15/85, as the A block copolymer / B block copolymer. ~ 30/70.

  The blending ratio of the epoxy-modified styrene synthetic rubber is, for example, 1 to 20 parts by weight, preferably 5 to 15 parts by weight with respect to 100 parts by weight of the resin component. When the blending ratio of the epoxy-modified styrene synthetic rubber is less than this, the reinforcing property and the adhesiveness may be lowered. On the other hand, when it is more than this, the adhesiveness at a low temperature may be lowered.

  Acrylonitrile-butadiene rubber is a synthetic rubber obtained by copolymerization of acrylonitrile and butadiene, and is not particularly limited. For example, acrylonitrile-butadiene rubber is partially crosslinked with a carboxyl group-introduced one or sulfur or metal oxide. Something that is included. Acrylonitrile butadiene rubber is a solid rubber and has good compatibility with the epoxy resin. Therefore, by including acrylonitrile-butadiene rubber, it is possible to improve adhesiveness, handling property, and reinforcing property in a wide temperature range near normal temperature (23 ° C.).

  Further, such acrylonitrile-butadiene rubber preferably has an acrylonitrile content of 10 to 50% by weight and a Mooney viscosity of preferably 25 (ML1 + 4, at 100 ° C.) or more.

  Moreover, the mixture ratio of acrylonitrile butadiene rubber is 5-30 weight part with respect to 100 weight part of resin components, Preferably, it is 8-25 weight part. If the blending ratio of acrylonitrile-butadiene rubber is less than this, the reinforcing effect may be reduced. On the other hand, if the blending ratio is more than this, the viscosity of the resin composition may be too low, resulting in poor handling. On the other hand, in the range of the above-mentioned blending ratio, low-temperature adhesiveness due to good compatibility with the epoxy resin, high-temperature cohesiveness due to acrylonitrile-butadiene rubber being a solid rubber can be expressed, Excellent handling and reinforcing effect can be obtained.

  Furthermore, a low polarity rubber is mentioned as a synthetic rubber. In some cases, the adhesiveness can be further improved by including a low-polar rubber. The low-polar rubber is a rubber having no polar group such as amino group, carboxyl group, and nitrile group, and examples thereof include solid or liquid synthetic rubber such as butadiene rubber, polybutene rubber, and synthetic natural rubber. . The low-polar rubber includes the styrene / butadiene rubber described above. These may be used alone or in combination. The low-polar rubber is preferably used in combination with acrylonitrile-butadiene rubber, and the blending ratio is, for example, 1 to 70 parts by weight, preferably 5 to 50 parts by weight with respect to 100 parts by weight of the resin component. .

  Examples of the thermoplastic resin include an ethylene copolymer from the viewpoint of thermally fusing the resin layer in a low temperature range (for example, 60 to 120 ° C.).

  The ethylene copolymer is a resin comprising a copolymer of ethylene and a monomer copolymerizable with ethylene, such as ethylene / vinyl acetate copolymer (EVA), ethylene / (meth) acrylic acid alkyl ester. A copolymer etc. are mentioned.

  The ethylene / vinyl acetate copolymer is, for example, a random or block copolymer of ethylene and vinyl acetate, preferably a random copolymer.

  Such an ethylene / vinyl acetate copolymer has a vinyl acetate content (based on the MDP method, the same shall apply hereinafter) of, for example, 12 to 50% by weight, preferably 14 to 46% by weight. The flow rate (MFR: compliant with JIS K 6730; hereinafter simply referred to as MFR) is 1-30 g / 10 min, preferably 1-15 g / 10 min, and the hardness (JIS K7215) is, for example, 60-100 degrees. Preferably, it is 70-100 degree | times, softening temperature is 35-70 degreeC, for example, and melting | fusing point is 70-100 degreeC, for example.

  The ethylene / (meth) acrylic acid alkyl ester copolymer is, for example, a random or block copolymer of ethylene and (meth) acrylic acid alkyl ester, preferably a random copolymer.

  The (meth) acrylic acid alkyl ester is a methacrylic acid alkyl ester and / or an acrylic acid alkyl ester, and more specifically, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylic. Propyl acid, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, ( Neo-pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acryl Isooctyl acid, nonyl (meth) acrylate, isono (meth) acrylate , Decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate (Meth) acrylic acid hexadecyl, (meth) acrylic acid heptadecyl, (meth) acrylic acid octadecyl alkyl (meth) acrylates (wherein the alkyl moiety is a linear or branched alkyl having 1 to 18 carbon atoms), etc. Can be mentioned. These (meth) acrylic acid alkyl esters can be used alone or in combination.

  Preferred are ethylene / ethyl acrylate copolymer (EEA) and ethylene / butyl acrylate copolymer (EBA).

  The ethylene / ethyl acrylate copolymer has an ethyl acrylate content (EA content, MDP method) of, for example, 9 to 35% by mass, preferably 9 to 25% by mass, and MFR is, for example, 0.5 to 25 g / 10 min, preferably 0.5 to 20 g / 10 min, and the hardness (Shore A, JIS K7215 (1986)) is, for example, 60 to 100 degrees, preferably 70 to 100 degrees. Yes, softening temperature (Vicat, JIS K7206 (1999)) is, for example, 35 to 70 ° C., melting point (JIS K7121 (1987)) is, for example, 70 to 100 ° C., and glass transition temperature (DVE method) Is, for example, −40 ° C. to −20 ° C.

  The ethylene / butyl acrylate copolymer has a butyl acrylate content (EB content, DuPont method) of, for example, 7 to 35% by mass, preferably 15 to 30% by mass, and MFR is, for example, 1 to 6 g / 10 min, preferably 1 to 4 g / 10 min, and the hardness (Shore A, ISO 868 or JIS K7215) is, for example, 75 to 100 degrees, preferably 80 to 95 degrees. The softening temperature (Vicat softening point, JIS K7206 or ISO 306) is, for example, 35 to 70 ° C, preferably 40 to 65 ° C, and the melting point (JIS K7121 or ISO 3146) is, for example, 80 to 120 degreeC, Preferably it is 90-100 degreeC.

  When the resin component contains the ethylene copolymer, the melting point of the resin composition can be set to, for example, 60 to 120 ° C., preferably 70 to 100 ° C., and in such a temperature range (low temperature). It can be heat-sealed. The temperature range described above is the operating temperature of the image display reinforcing sheet in which the resin component is a thermosetting resin (the curing temperature, that is, the temperature at which the curing agent decomposes, for example, 150 to 200 ° C.). In comparison, it is set low.

  In the present invention, the resin component is a thermosetting resin selected when the resin layer is cured, and further, when the resin layer is foamed. More specifically, from the above-described epoxy resin and synthetic rubber, Single or two or more types are selected. Preferably, an epoxy resin is selected as an essential component, and an optional component is selected from synthetic rubber. More preferably, both epoxy resin and synthetic rubber are selected. Particularly preferably, for example, a combination of an epoxy resin and a styrene synthetic rubber, a combination of an epoxy resin and an acrylonitrile-butadiene rubber, or a combination of an epoxy resin and a low-polar rubber is selected.

  In the present invention, as the resin component, when the resin layer is heat-sealed, a thermoplastic resin is selected, and an ethylene copolymer is preferably selected.

  A hardening | curing agent is mix | blended, for example, when the resin component contains thermosetting resins, such as an epoxy resin. Examples of the curing agent include amine compounds, acid anhydride compounds, amide compounds, hydrazide compounds, imidazole compounds, imidazoline compounds, and the like. Other examples include phenolic compounds, urea compounds, polysulfide compounds, and the like.

  Examples of the amine compounds include ethylenediamine, propylenediamine, diethylenetriamine, triethylenetetramine, amine adducts thereof, metaphenylenediamine, diaminodiphenylmethane, and diaminodiphenylsulfone.

  Examples of the acid anhydride compounds include phthalic anhydride, maleic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyl nadic acid anhydride, pyromellitic acid anhydride, dodecenyl succinic acid anhydride, dichloromethane. Succinic acid anhydride, benzophenone tetracarboxylic acid anhydride, chlorendic acid anhydride, etc. are mentioned.

  Examples of amide compounds include dicyandiamide and polyamide.

  Examples of the hydrazide compounds include dihydrazides such as adipic acid dihydrazide.

  Examples of the imidazole compounds include methylimidazole, 2-ethyl-4-methylimidazole, ethylimidazole, isopropylimidazole, 2,4-dimethylimidazole, phenylimidazole, undecylimidazole, heptadecylimidazole, and 2-phenyl-4. -Methylimidazole etc. are mentioned.

  Examples of the imidazoline compounds include methyl imidazoline, 2-ethyl-4-methyl imidazoline, ethyl imidazoline, isopropyl imidazoline, 2,4-dimethyl imidazoline, phenyl imidazoline, undecyl imidazoline, heptadecyl imidazoline, 2-phenyl-4. -Methyl imidazoline etc. are mentioned.

  These curing agents may be used alone or in combination. Of these curing agents, dicyandiamide is preferably used in consideration of adhesiveness.

  Moreover, although the mixture ratio of a hardening | curing agent is based also on the equivalent ratio of a hardening | curing agent and a resin component, it is 0.5-50 weight part with respect to 100 weight part of resin components, Preferably, 1-40 weight part More preferably, it is 1 to 15 parts by weight.

  Moreover, a hardening accelerator can be used together with a hardening | curing agent as needed. Examples of the curing accelerator include imidazoles, ureas, tertiary amines, phosphorus compounds, quaternary ammonium salts, and organometallic salts. These may be used alone or in combination. The blending ratio of the curing accelerator is, for example, 0.1 to 20 parts by weight, preferably 0.2 to 10 parts by weight with respect to 100 parts by weight of the resin component.

  A crosslinking agent is mix | blended, for example when the resin component contains crosslinking | crosslinked resin, such as a synthetic rubber. Examples of the crosslinking agent include sulfur, sulfur compounds, selenium, magnesium oxide, lead monoxide, and organic peroxides (for example, dicumyl peroxide, 1,1-ditertiarybutylperoxy-3, 3, 5 -Trimethylcyclohexane, 2,5-dimethyl-2,5-ditertiarybutylperoxyhexane, 2,5-dimethyl-2,5-ditertiarybutylperoxyhexine, 1,3-bis (tertiarybutylperoxy Isopropyl) benzene, tertiary butyl peroxyketone, tertiary butyl peroxybenzoate), polyamines, oximes (for example, p-quinonedioxime, p, p′-dibenzoylquinonedioxime, etc.), nitroso compounds ( For example, p-dinitrosobenzidine, etc.), resins (for example, alkylphenol- Le formaldehyde resins, melamine - formaldehyde condensate, etc.), ammonium salts (e.g., ammonium benzoate), and the like.

  These crosslinking agents may be used alone or in combination. Of these crosslinking agents, sulfur is preferably used in consideration of curability and reinforcing properties.

  Moreover, the mixture ratio of a crosslinking agent is 1-20 weight part with respect to 100 weight part of resin components, Preferably, it is 2-15 weight part. If the blending ratio of the cross-linking agent is less than this, the reinforcing property may be lowered. On the other hand, if it is more than this, the adhesiveness may be lowered, which may be disadvantageous in cost.

  Moreover, a crosslinking accelerator can be used together with a crosslinking agent if necessary. Examples of the crosslinking agent accelerator include zinc oxide, disulfides, dithiocarbamic acids, thiazoles, guanidines, sulfenamides, thiurams, xanthogenic acids, aldehyde ammonias, aldehyde amines, thioureas and the like. These crosslinking accelerators can be used alone or in combination. The blending ratio of the crosslinking accelerator is, for example, 1 to 20 parts by weight, preferably 3 to 15 parts by weight with respect to 100 parts by weight of the resin component.

  The foaming agent is blended, for example, when it is desired to foam the resin layer. Examples of the foaming agent include inorganic foaming agents and organic foaming agents. Examples of the inorganic foaming agent include ammonium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, azides and the like.

  Examples of organic foaming agents include N-nitroso compounds (N, N′-dinitrosopentamethylenetetramine, N, N′-dimethyl-N, N′-dinitrosotephthalamide, etc.), azo compounds, and the like. (Eg, azobisisobutyronitrile, azodicarboxylic amide, barium azodicarboxylate, etc.), fluorinated alkanes (eg, trichloromonofluoromethane, dichloromonofluoromethane, etc.), hydrazine compounds (eg, p-toluenesulfonyl) Hydrazide, diphenylsulfone-3,3′-disulfonylhydrazide, 4,4′-oxybis (benzenesulfonylhydrazide), allylbis (sulfonylhydrazide), semicarbazide compounds (eg, p-toluylenesulfonyl semicarbazide, 4,4 '-Oki Bis (benzenesulfonyl semicarbazide), etc.), triazole compound (e.g., 5-morpholyl-1,2,3,4-thiatriazole, etc.) and the like.

  As a foaming agent, a heat-expandable substance (for example, isobutane, pentane, etc.) is enclosed in a microcapsule (for example, a microcapsule made of a thermoplastic resin such as vinylidene chloride, acrylonitrile, acrylic acid ester, methacrylic acid ester). Examples thereof include thermally expanded fine particles. As such thermally expandable fine particles, for example, commercially available products such as microspheres (trade name, manufactured by Matsumoto Yushi Co., Ltd.) are used.

  These foaming agents may be used alone or in combination. Among these foaming agents, 4,4'-oxybis (benzenesulfonylhydrazide) (OBSH) is preferably used in consideration of stable foaming without being influenced by external factors.

  The blending ratio of the foaming agent is 0.1 to 30 parts by weight, preferably 0.5 to 20 parts by weight with respect to 100 parts by weight of the resin component. If the blending ratio of the foaming agent is less than this, foaming does not occur sufficiently, and the reinforcing property may be reduced due to insufficient thickness. On the other hand, if it is more than this, the density may be reduced and the reinforcing property may be reduced.

  Moreover, a foaming adjuvant can be used together with a foaming agent as needed. Examples of foaming aids include zinc stearate, urea compounds, salicylic acid compounds, benzoic acid compounds, and the like. These foaming aids may be used alone or in combination. The blending ratio of the foaming aid is, for example, 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight with respect to 100 parts by weight of the resin component.

  Further, in addition to the above components, such a resin composition includes a filler, a tackifier, and, if necessary, for example, a thixotropic agent (for example, montmorillonite), a lubricant (for example, stearic acid). Etc.), pigments, scorch inhibitors, stabilizers, softeners, plasticizers, anti-aging agents, antioxidants, ultraviolet absorbers, colorants, fungicides, flame retardants, etc. You can also.

  Examples of the filler include calcium carbonate (for example, heavy calcium carbonate, light calcium carbonate, white luster, etc.), talc, mica, clay, mica powder, bentonite (including organite), silica, alumina, aluminum silicate, Examples thereof include titanium oxide, carbon black, acetylene black, aluminum powder, and glass powder (powder). These fillers may be used alone or in combination. The blending ratio of the filler is, for example, 1 to 500 parts by weight, preferably 10 to 300 parts by weight with respect to 100 parts by weight of the resin component.

  Examples of the tackifier include rosin resins, terpene resins (eg, terpene-aromatic liquid resins), coumarone indene resins (coumarone resins), petroleum resins (eg, C5 / C6 petroleum). Resin, C5 petroleum resin, C9 petroleum resin, C5 / C9 petroleum resin, etc.), phenolic resin and the like. These tackifiers may be used alone or in combination. Moreover, although melting | fusing point of a tackifier is based also on the kind of resin component, a mixture ratio, and melting | fusing point, it is 50-150 degreeC, for example. The compounding ratio of the tackifier is, for example, 1 to 200 parts by weight, preferably 5 to 150 parts by weight with respect to 100 parts by weight of the resin component.

  Moreover, when the resin composition contains an ethylene copolymer, it is preferable to further blend a filler and a tackifier.

  When the resin composition contains a thermosetting resin and a curing agent, the resin layer becomes a curable resin layer. Moreover, when the resin composition contains a thermosetting resin, a curing agent, and a foaming agent, a foamable resin layer is obtained. Moreover, when the resin composition contains a thermoplastic resin, it becomes a heat-sealable resin layer.

  The resin composition can be obtained by blending the above-described components at the blending ratio described above, and is not particularly limited. For example, the resin composition is kneaded by a mixing roll, a pressure kneader, an extruder, and the like. Can be prepared as a product.

  In addition, the flow tester viscosity (60 degreeC, 24 kg load) of the kneaded material obtained in this way is 50-50000 Pa.s, for example, Preferably, it is 100-5000 Pa.s.

  Thereafter, the obtained kneaded product is not particularly limited, but is rolled into a sheet shape by, for example, calendar molding, extrusion molding or press molding to form a resin layer.

  In the formation of the resin layer, the temperature condition is not particularly limited, but when the resin layer contains a curing agent or a foaming agent, the temperature condition is set so that the curing agent or the foaming agent is not substantially decomposed. . Moreover, when a resin composition contains a thermoplastic resin (ethylene copolymer), a resin layer is formed at 60-150 degreeC, for example.

  In addition, the thickness of the rolled resin layer is 0.2-3.0 mm, for example, Preferably, it is 0.5-2.5 mm.

In the present invention, the resin composition contains an ethylene copolymer, a filler, and a tackifier, and the resin layer formed by rolling as described above has a Young's modulus at 23 ° C. (normal temperature), for example, 1.0 × 10 ⁷ N / m ² or more, preferably 5.0 × 10 ⁷ N / m ² or more, and usually 1.0 × 10 ¹⁰ N / m ² or less. If the Young's modulus of the resin layer is less than 1.0 × 10 ⁷ N / m ² , sufficient reinforcement may not be obtained.

  The Young's modulus is, for example, a resin layer formed by rolling to a thickness of 0.8 mm, cut to 10 mm width × 100 mm length, and this is speeded at 5 mm / min between 50 mm chucks by a universal testing machine. It is calculated by measuring the tensile strength.

  In the present invention, the constraining layer constrains the resin layer, retains the shape of the heated resin layer, and imparts toughness to the resin layer to improve strength. Further, the constraining layer has a sheet shape and is formed of a material that is lightweight and thin and can be closely integrated with the heated resin layer. Examples of such materials include glass cloth, metal foil, synthetic resin nonwoven fabric, and carbon fiber.

  The glass cloth is made of glass fiber and a known glass cloth is used. The glass cloth includes a resin-impregnated glass cloth. As the resin-impregnated glass cloth, the above-described glass cloth is impregnated with a synthetic resin such as a thermosetting resin or a thermoplastic resin, and a known one is used. In addition, as such a thermosetting resin, an epoxy resin, a urethane resin, a melamine resin, a phenol resin etc. are mentioned, for example. Examples of such thermoplastic resins include vinyl acetate resins, ethylene / vinyl acetate copolymers (EVA), vinyl chloride resins, EVA / vinyl chloride resin copolymers, and the like. Moreover, the above-mentioned thermosetting resin and the above-mentioned thermoplastic resin (for example, melamine resin and vinyl acetate resin) can also be mixed.

  Examples of the metal foil include known metal foils such as an aluminum foil and a steel foil.

  Of these, glass cloth is preferably used in consideration of weight, adhesion, strength, and cost.

  Moreover, the thickness of a constrained layer is 0.05-2 mm, for example, Preferably, it is 0.1-1.0 mm.

  And the reinforcement sheet for image display apparatuses of this invention can be obtained by bonding together and laminating | stacking an above-described resin layer and a constraining layer. The total thickness of the resin layer and the constraining layer is, for example, 0.3 to 5 mm, preferably 0.6 to 3.5 mm.

  In addition, the obtained reinforcing sheet for an image display device includes a separator (if necessary) on the surface of the resin layer (the surface opposite to the back surface on which the constraining layer is laminated) until it is actually used. Release paper) can also be attached.

  And the reinforcing sheet for image display apparatuses of this invention is used in order to reinforce an image display apparatus.

  The image display device is not particularly limited, but is an electric device on which an image display unit (monitor) including a liquid crystal panel, a plasma display panel, an electroluminescence panel, or the like is mounted. For example, a computer display, a television, a mobile phone, Examples include game machines.

  FIGS. 1 to 3 show that a reinforcing sheet for an image display device as an embodiment of a method for reinforcing an image display device of the present invention is disposed on the image display device, and the resin layer is heated and foamed, FIG. 1 is an explanatory view showing a method of reinforcing an image display device, FIG. 1 is an exploded perspective view of the image display device, and FIG. 2 is a cross-sectional view of the main part of the image display device shown in FIG. Is a state before foaming, (b) is a state after foaming, FIG. 3 is a front view of the reinforcing sheet for an image display device, and (a) to (d) show various arrangement modes.

  Next, referring to FIG. 1 to FIG. 3, a foamable resin layer in which a reinforcing sheet for an image display device as an embodiment of a method for reinforcing an image display device of the present invention is disposed on the image display device. A method of reinforcing the image display device by heating and foaming the substrate will be described.

  In this method, first, the reinforcing sheet 1 for an image display device is arranged on the image display device 2. To arrange the image display device reinforcing sheet 1 on the image display device 2, for example, as shown in FIG. 1, the image display device reinforcement sheet 1 is placed on the image display unit 3 or the casing 4 of the image display device 2. Adhere.

  That is, in FIG. 1, the image display device 2 is a computer display, a television, a mobile phone, a game machine, or the like as described above, and is an image equipped with a liquid crystal panel, a plasma display panel, an electroluminescence panel, or the like. A display unit 3 and a casing 4 for housing the image display unit 3 are provided.

  In FIG. 1, the image display unit 3 is formed in a substantially rectangular plate shape in plan view. The casing 4 includes a bottom plate 5 and a frame plate 6 and is formed in a bottomed rectangular frame shape that can accommodate the image display unit 3. The shapes of the image display unit 3 and the casing 4 are appropriately selected depending on the type of the image display device 2. The material for forming the casing 4 is not particularly limited and is appropriately selected, and examples thereof include resins and metals.

  As described above, the reinforcing sheet 1 for an image display device includes the foamable resin layer 1A and the constraining layer 1B laminated on the resin layer 1A. Adhere to unit 3 or casing 4.

  In FIG. 1, the resin layer 1 </ b> A is adhered to the casing 4, but it is appropriately selected as to which the resin layer 1 </ b> A is adhered.

  In FIG. 1, the image display device reinforcing sheet 1 is more specifically attached to the entire inner surface of the bottom plate 5 of the casing 4 as shown in FIG. The reinforcing sheet 1 for an image display device is processed (cut) into an appropriate shape, and, for example, a frame shape along the peripheral edge of the bottom plate 5 as shown in FIG. As shown in FIG. 3 (c), it may be attached in a streak shape with a space between each other. Further, as shown in FIG. You can also wear it.

  The reinforcing sheet 1 for an image display device may be attached not only to the bottom plate 5 of the casing 4 but also to the frame plate 6, and further, as described above, a portion that requires rigidity in the image display unit 3. It can also be attached to.

  Then, as shown in FIG. 1, after the resin layer 1 </ b> A of the reinforcing sheet 1 for image display device is attached to the bottom plate 5 of the casing 4, the image display unit 3 is attached to the casing 4 as shown in FIG. And the image display unit 3 is accommodated in the casing 4. In housing the image display unit 3 in the casing 4, a space is provided between the image display unit 3 and the image display device reinforcing sheet 1 so that the resin layer 1 </ b> A can be foamed.

  Thereafter, the resin layer 1A of the reinforcing sheet 1 for an image display device disposed in the casing 4 is foamed as shown in FIG.

  The foaming of the resin layer 1A is appropriately selected depending on the type of the resin composition, and is heated at, for example, 160 to 210 ° C. By this heating, the resin layer 1A is simultaneously cured and foamed. Further, when the resin layer 1A further contains a crosslinking agent, it is simultaneously cured, foamed and crosslinked. Note that the reinforcing sheet 1 for an image display device is in close contact with the image display unit 3 by the foaming of the resin layer 1A.

In addition, the volume foaming ratio at the time of foaming of the resin layer 1A (foamed layer 1C) after foaming is, for example, 1.1 to 5.0 times, and preferably 1.5 to 3.5 times. The density of the foam layer (weight of the foam layer (g) / volume of the foam layer (g / cm ³ )) is, for example, 0.2 to 1.0 g / cm ³ , preferably 0.3 to 0.00. 8 g / cm ³ .

  Then, as shown in FIG. 2 (b), the resin layer 1A increases in strength and thickness due to curing and foaming to become a foamed layer 1C. As a result, the rigidity of the image display device reinforcing sheet 1 is increased by the thickness of the foam layer 1C, so that the casing 4 (and / or the image) to which the image display device reinforcing sheet 1 is attached is improved. The strength of the display unit 3) can be improved.

  Moreover, the foam layer 1 </ b> C is lightweight and can effectively suppress an increase in the weight of the image display device 2. Further, after foaming, the foam layer 1C is restrained by the constraining layer 1B, so that the foam layer 1C is constrained with the casing 4 (and / or the image display unit 3) while the foam layer 1C is well shaped. By being sandwiched between the layer 1B, the strength can be further improved.

  In addition, since this reinforcement sheet 1 for image display apparatuses can follow along the sticking surface, even if the site | part which requires rigidity is a complicated shape, it can adhere reliably with sufficient workability | operativity. it can.

  Therefore, the image display device 2 reinforced with such a reinforcing sheet 1 for image display device can obtain sufficient rigidity while being lightweight, and can improve durability.

  FIG. 4 is a cross-sectional view of an essential part of another embodiment of the image display device of the present invention (an embodiment in which the resin layer is formed from a curable resin layer or a heat-sealable resin layer). ) Shows a state before curing or a state before heat fusion, and (b) shows a state after curing or a state after heat fusion. In addition, about the member corresponding to each above-mentioned part, the same referential mark is attached | subjected in each subsequent figure, and the detailed description is abbreviate | omitted.

  Next, referring to FIG. 4, a reinforcing sheet for an image display device as another embodiment of the method for reinforcing an image display device of the present invention is disposed on the image display device, and the curable resin layer is heated. Next, a method for reinforcing the image display device by curing it will be described.

  The resin layer 1A of the reinforcing sheet 1 for an image display device is a curable resin layer that does not foam.

  In this method, first, the reinforcing sheet 1 for an image display device is arranged on the image display device 2. That is, as shown in FIG. 1, after the resin layer 1 </ b> A of the reinforcing sheet 1 for image display device is attached to the bottom plate 5 of the casing 4, the image display unit 3 is mounted as shown in FIG. The image display unit 3 is accommodated in the casing 4 by being assembled to the casing 4. When the image display unit 3 is accommodated in the casing 4, the resin layer 1 </ b> A of the image display device reinforcing sheet 1 does not foam, so the image display unit 3 and the image display device reinforcing sheet 1 are brought into close contact with each other.

  Thereafter, the resin layer 1A of the reinforcing sheet 1 for an image display device disposed in the casing 4 is cured as shown in FIG.

  Although hardening of 1 A of resin layers is suitably selected according to the kind etc. of resin composition, it heats at 140-160 degreeC, for example. By this heating, the resin layer 1A is cured. Moreover, when the resin composition of 1 A of resin layers contains a crosslinking agent, 1 A of resin layers harden | cure and bridge | crosslink simultaneously. In addition, in this resin layer 1A, the thickness of the reinforcing sheet 1 for an image display device is substantially the same before and after curing.

  Then, the resin layer 1 </ b> A is cured to increase the strength and become the cured layer 1 </ b> D. Thereby, the reinforcement sheet 1 for image display apparatuses can improve the intensity | strength of the casing 4 (and / or image display unit 3) to which the reinforcement sheet 1 for image display apparatuses was stuck.

  In addition, the cured layer 1D obtained by curing the resin layer 1A is lightweight and can effectively suppress an increase in the weight of the image display device 2. Furthermore, since the resin layer 1A in the middle of curing (or the cured layer 1D after curing) is constrained by the constraining layer 1B at the time of curing (midway) and after curing, the constraining is performed while the cured layer 1D is well shaped. The strength can be further improved by the layer 1B.

  Next, the image display device reinforcing sheet as another embodiment of the image display device reinforcement method of the present invention is disposed on the image display device, and the heat-sealable resin layer is heated and pressurized. A method for reinforcing the reinforcing sheet for an image display device will be described.

  The resin layer 1A of the reinforcing sheet 1 for an image display device is a heat-sealable resin layer that does not foam.

  In this method, first, the reinforcing sheet 1 for an image display device is arranged on the image display device 2. That is, as shown in FIG. 1, the heat-sealable resin layer 1 </ b> A of the image display device reinforcing sheet 1 is attached (temporarily fixed or temporarily fixed) to the bottom plate 5 of the casing 4.

  Next, as shown in FIG. 4A, the image display unit 3 is assembled to the casing 4 and the image display unit 3 is accommodated in the casing 4. When the image display unit 3 is accommodated in the casing 4, the resin layer 1 </ b> A of the image display device reinforcing sheet 1 does not foam, so the image display unit 3 and the image display device reinforcing sheet 1 are brought into close contact with each other.

  Then, as shown in FIG.4 (b), the reinforcement sheet 1 for image display apparatuses is heated and pressurized. Although heating temperature is based also on melting | fusing point and softening temperature of a thermoplastic resin, it is 60-120 degreeC, for example, Preferably, it is 70-100 degreeC. At the same time as or after the heating, the image display device reinforcing sheet 1 is, for example, at a pressure at which the resin composition does not flow out of the sticking position. Pressurize at a pressure of 15 to 10 MPa.

  In pressurization, the reinforcing sheet 1 for the image display device and the bottom plate 5 are heated at the same time or after being heated, for example, with a laminator roll, a hand roll (roller), a spatula, etc., for example, at a speed of 5 to 500 mm / min, pressure The resin layer 1A is pressure-bonded toward the bottom plate 5 at 0.05 to 0.5 MPa.

  In addition, in this resin layer 1A, the thickness of the reinforcing sheet 1 for an image display device is substantially the same before and after heating and pressing.

  Then, by the heating described above, the resin layer 1A becomes the heat-sealing layer 1E, and further, by being pressurized, the heat-sealing layer 1E is heat-sealed (adhered) with good adhesion to the bottom plate 5 and the constraining layer 1B. . Therefore, the strength of the bottom plate 5 can be improved by the thermal fusion of the thermal fusion layer 1E.

  In addition, since the resin layer 1A does not contain any of a thermosetting resin, a curing agent, or a crosslinking agent, the resin layer 1A can be heated and pressurized at a low temperature and in a short time while ensuring good storage stability. Thus, the bottom plate 5 can be reinforced. As a result, it is possible to reliably manufacture the image display reinforcing sheet 1 provided with the resin layer 1A, and to ensure the reliable use of the image display reinforcing sheet 1, while heating and pressurizing at a low temperature for a short time. Reliable reinforcement can be achieved.

  In addition, it can also heat after the above-mentioned heating and pressurization. In such heating, for example, the bottom plate 5 and the image display reinforcing sheet 1 are put into a coating drying furnace used for drying the casing 4 after painting.

Hereinafter, the present invention will be described in more detail with reference to Examples , Reference Examples, and Comparative Examples, but the present invention is not limited to the Examples , Reference Examples, and Comparative Examples.
1) Reinforcing test A
a. Preparation of Reinforcing Sheet for Image Display Device ( Reference Examples 1 to 5) In the formulation shown in Table 1, each component was blended on the basis of parts by weight and kneaded with a mixing roll to prepare a kneaded product.

In this kneading, first, after kneading the resin component, filler, tackifier (only Reference Examples 1 and 2) with a mixing roll heated to 120 to 130 ° C., after cooling, Furthermore, the remaining components (curing agent, curing accelerator ( reference examples 3 to 5 only), foaming agent (only reference examples 1 to 4), crosslinking agent (only reference examples 1 and 2) and crosslinking accelerator ( reference example 1, 2) only) and kneaded with a mixing roll.

Next, this kneaded product is rolled to a thickness of 0.6 mm with a calender roll to form a foamable resin layer ( Reference Examples 1 to 4) and a curable resin layer ( Reference Example 5). A reinforcing sheet for an image display device was produced by bonding a glass cloth having a thickness of 0.2 mm as a constraining layer to the layer.
b. Preparation of test piece The resin layer of the prepared reinforcing sheet for an image display device was attached to the entire inner surface of a test steel plate having a width of 25 mm × 150 mm length × 0.8 mm in an atmosphere of 20 ° C., and 160 ° C. ( Reference Examples 1 and 2), 180 ° C. ( Reference Examples 3 and 4) or 150 ° C. ( Reference Example 5) by heating for 20 minutes, foam layer ( Reference Examples 1 to 4) or cured layer ( Reference Example 5) Thus, a test piece was obtained.
c. Evaluation of Reinforcing Sheet for Image Display Device (Example) With the test steel plate facing upward, the obtained test pieces of Reference Examples 1 to 5 were supported with a span of 100 mm, and a test bar was provided at the center in the longitudinal direction. Was lowered from above in the vertical direction at a compression rate of 1 mm / min, and the bending strength when the foamed layer or hardened layer was displaced by 1 mm after contacting the test steel sheet was evaluated as the reinforcing property. Moreover, the test steel plate in which neither a foam layer nor a hardened layer was provided was evaluated as Comparative Example 1, and its reinforcement was evaluated. The results are shown in Table 1.
2) Reinforcing test B
a. Preparation of Reinforcing Sheet for Image Display Device ( Reference Example 5) A curable resin layer having a thickness of 0.8 mm was prepared based on the formulation of the resin composition of Reference Example 5 in the reinforcing test A. Next, this resin layer and a constraining layer having a thickness of 0.2 mm were bonded together to produce a 1.0 mm thick reinforcing sheet for an image display device, which was cut into a width of 25 mm × 310 mm.
b. Next, the reinforcing sheet for an image display device is adhered in a streak shape to the bottom plate 5 of the liquid crystal monitor unit shown in FIG. 5 as shown in FIGS. 6 (a), (c) and (d). did.

  The bottom plate 5 was made of a magnesium alloy (product number: Mg (AZ91D)), and the size thereof was 335 mm long × 235 mm wide as shown in FIG.

  In addition, the attachment region R for attaching the reinforcing sheet 1 for an image display device is the inner surface of the bottom plate 5 in consideration that the casing 4 is provided with wiring connectors and frame plates 6 of a liquid crystal panel, a backlight and a light guide plate. The region is narrower than the entire inner surface of the bottom plate 5 so that the peripheral edge is exposed. The magnitude | size of the sticking area | region R was 310 mm length x 120 mm width, as shown by the dotted line of FIG.

  And as shown to Fig.6 (a), the 1 sheet of reinforcing sheets 1 for image display apparatuses was stuck over the longitudinal direction in the center of the width direction of the sticking area | region R of the baseplate 5 at 20 degreeC (room temperature). . Next, the resin layer 1 </ b> A was pressed against the bottom plate 5 by reciprocating once with a 2 kg roller. Subsequently, this was heated at 150 ° C. for 30 minutes to form a cured layer 1D. Then, the test piece was produced by leaving to stand at normal temperature (23 degreeC) for 2 hours.

  Next, as shown in FIGS. 6C and 6D, three or four image display device reinforcing sheets 1 are spaced apart from each other at equal intervals in the width direction at the center in the width direction of the bottom plate 5. Sticked in stripes. Thereafter, the cured layer 1D was formed by heating in the same manner as described above to obtain a test piece.

As shown in FIG. 6C, the total width of the three image display device reinforcing sheets 1 is 75 mm, and the interval between the image display device reinforcing sheets 1 is 22.5 mm. It was. In addition, as shown in FIG. 6D, the total width of the four image display device reinforcing sheets 1 is 100 mm, and the interval between the image display device reinforcing sheets 1 is 6.7 mm. It was.
c. Evaluation of Reinforcing Sheet for Image Display Device Each test piece is supported by a support base having a length of 100 mm, a radius of curvature of 2 mm, and a span of 300 mm in a state where the bottom plate 5 faces upward, and a test piece having a diameter of 18 mm at the center in the longitudinal direction. The bar was lowered from above in the vertical direction at a compression speed of 5 mm / min, and the bending strength when the cured layer 1D was displaced by 1 mm after contacting the bottom plate 5 and the bending strength when displaced by 2 mm were evaluated as reinforcing properties. .

Separately, the bottom plate 5 on which the image display device reinforcing sheet 1 was not provided was evaluated as a blank in the same manner as described above. The result is shown in FIG.
3) Reinforcement test C
a. Production of Reinforcing Sheet for Image Display Device (Example 6) A reinforcing sheet for image display device comprising a heat-sealable resin layer and a constraining layer was produced.

  In order to produce a reinforcing sheet for an image display device, first, 100 parts by weight of ethylene / ethyl acrylate copolymer (EEA), 50 parts by weight of terpene resin and 50 parts by weight of carbon black are mixed at 100 ° C. with a mixing roll. A kneaded product of the resin composition was prepared by kneading. Next, a resin layer having a thickness of 1.8 mm and capable of being heat-sealed was formed using a calender roll.

Next, the resin layer and a constraining layer made of a glass cloth having a thickness of 0.2 mm were bonded together to prepare a 2.0 mm reinforcing sheet for an image display device. Next, the reinforcing sheet for an image display device was cut into a width of 25 mm and a length of 310 mm.
b. Next, the reinforcing sheet 1 for an image display device is attached in a streak shape to the bottom plate 5 of the liquid crystal monitor unit shown in FIG. 5 as shown in FIGS. 6 (a) to 6 (d). did.

  In sticking the image display device reinforcing sheet 1 to the bottom plate 5, one, three, and four image display device reinforcing sheets 1 were stuck in the same arrangement as in the reinforcing test B described above.

  Further, in the same manner as in the reinforcement test B described above, as shown in FIG. 6B, two sheets of the reinforcing sheet 1 for an image display device were attached. Specifically, in this sticking, the two reinforcing sheets 1 for an image display device were stuck in a streak shape spaced apart in the width direction at the center of the bottom plate 5 in the width direction. The total width of the two image display device reinforcing sheets 1 was 50 mm, and the distance between the two image display device reinforcing sheets 1 was 23 mm.

  The reinforcement sheet 1 for the image display device was attached as follows.

First, the bottom plate 5 of the liquid crystal monitor unit 1 was preheated to 120 ° C. Next, the heating sheet 1E was formed by sticking the reinforcing sheet 1 for image display device to the bottom plate 5 while heating to 120 ° C. Subsequently, the heat sealing layer 1E was pressed against the bottom plate 5 by reciprocating twice with a 2 kg roller. Then, this was left to stand at normal temperature (23 degreeC) for 2 hours, and the test piece was produced.
c. Evaluation of Reinforcing Sheet for Image Display Device Reinforcing property was evaluated in the same manner as the evaluation of the reinforcing sheet for image display device in the reinforcing test B described above. The result is shown in FIG.
4) Adhesion test a. Preparation of Reinforcing Sheets for Image Display Devices ( Reference Examples 1 to 5) According to the same formulation as in the above-described reinforcement test A, the reinforcing sheets for image display devices of Reference Examples 1 to 5 were prepared, and these were 25 mm wide. Respectively.
b. Evaluation of Reinforcing Sheet for Image Display Device Thereafter, the cut reinforcing sheet for image display device of each of Examples 1 to 5 was pressure-bonded to the application surface of each test steel plate with a 2 kg roller in a 5 ° C. atmosphere, and then 30 After a minute, the adhesive strength (N / 25 mm) was measured by a 90 ° peel test (tensile speed of 300 mm / min), and this was evaluated as adhesiveness. The results are shown in Table 1.
5) Young's modulus a. Preparation of Resin Layer (Examples 6 and 7) In the formulation of Examples 6 and 7 shown in Table 1, the components were blended on the basis of parts by weight and kneaded with a mixing roll to prepare a kneaded product. . In this preparation, an ethylene copolymer, a filler, and a tackifier were kneaded at 100 ° C.

Next, the prepared kneaded product was rolled to a thickness of 0.8 mm with a calendar roll to form a resin layer.
b. Evaluation of Resin Layer The 0.8 mm thick resin layer formed by rolling in Examples 6 and 7 was cut into 10 mm width × 100 mm length, and this was cut by a universal tester between 5 mm / min between 50 mm chucks. The Young's modulus was calculated for each speed by measuring the tensile strength. The results are shown in Table 1.

It is a disassembled perspective view of one Embodiment (The aspect in which the resin layer is formed from the foamable resin layer) of the image display apparatus of this invention. It is principal part sectional drawing of the image display apparatus shown in FIG. 1, Comprising: (a) shows the state before foaming, (b) shows the state after foaming. It is a front view of the reinforcement sheet for image display apparatuses shown in FIG. 1, Comprising: (a) is the aspect which has arrange | positioned the reinforcement sheet for image display apparatuses in the inner surface whole surface of a casing, (b) is for image display apparatuses The aspect which arrange | positioned the reinforcement sheet | seat in the frame shape along the inner surface peripheral part of the bottom plate of a casing, (c) is the aspect which arrange | positioned the reinforcement sheet | seat for image display apparatuses on the inner surface of the bottom plate of a casing at intervals mutually. (D) shows the aspect which has arrange | positioned the reinforcing sheet for image display apparatuses on the inner surface of the baseplate of a casing in the shape of a grid | lattice. It is principal part sectional drawing of other embodiment (The aspect in which the resin layer is formed from the resin layer which can be hardened | cured, or the heat-sealable resin layer) of the image display apparatus of this invention, Comprising: (a) is before hardening The state or the state before heat fusion, (b) shows the state after curing or the state after heat fusion. It is a front view of the baseplate provided to the reinforcement test B and C of an Example and a reference example , Comprising: The baseplate before the reinforcement sheet for image display apparatuses is arrange | positioned is shown. In the reinforcing property tests B and C of Examples and Reference Examples , it is a front view of a bottom plate on which a reinforcing sheet for an image display device is arranged, and (a) is a single reinforcing sheet for an image display device. The bottom plate, (b) is a bottom plate on which two image display device reinforcing sheets are arranged (reinforcing test C only), (c) is a bottom plate on which three image display device reinforcing sheets are arranged, ( d) shows a bottom plate on which four reinforcing sheets for an image display device are arranged. The graph of the result of evaluation of the reinforcement test B is shown. The graph of the result of evaluation of the reinforcement test C is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcing sheet for image display device 1A Resin layer 1B Constrained layer 1C Foamed layer 1D Hardened layer 1E Thermal fusion layer 2 Image display device 3 Image display unit 4 Casing 5 Bottom plate 6 Frame plate

Claims (5)

An image display device comprising a casing and an image display unit,
The image display device reinforcing sheet is adhered to at least one of the casing and the image display unit,
The reinforcing sheet includes a resin layer that can be heat-sealed in a temperature range of 60 to 120 ° C., and a constraining layer laminated on the resin layer,
The resin layer has a Young's modulus at 23 ° C. of 1.0 × 10 ⁷ N / m ² An image display device characterized by the above. The image display device according to claim 1, wherein the constraining layer is a glass cloth. The image display device according to claim 1, wherein the resin layer contains an ethylene copolymer. The image display device according to claim 3 , wherein the resin layer further contains a filler and a tackifier. A method for reinforcing an image display device comprising a casing and an image display unit,
A reinforcing sheet for an image display device , comprising: a heat-sealable resin layer having a Young's modulus at 23 ° C. of 1.0 × 10 ⁷ N / m ² or more; and a constraining layer laminated on the resin layer. And a method of reinforcing an image display device , comprising: heating the resin layer at 60 to 120 ° C. after being attached to at least one of the image display units.

Images