KR101386263B1 - Pressure-sensitive adhesive tape or sheet having reflectivity and/or light shielding property - Google Patents

Abstract

An object of the present invention is to provide an adhesive tape or sheet having a heat dissipation function and having reflective and / or light shielding properties. Reflective and / or light-shielding adhesive tapes or sheets according to the present invention have an adhesive layer on at least one side of the substrate, and at least one side has a reflectance of 60% or more and / or transmittance of 0.3% or less. It has, and a base material is a metal base material of 3 micrometers or more in thickness. It is characterized by the above-mentioned. Metal foil is suitable as a metal base material, Especially an aluminum base material can be used suitably. As the metal substrate, a metal substrate having a black layer on at least one surface can be used. The pressure-sensitive adhesive layer on at least one side of the substrate may contain a thermally conductive compound.

Description

PRESSURE-SENSITIVE ADHESIVE TAPE OR SHEET HAVING REFLECTIVITY AND / OR LIGHT SHIELDING PROPERTY}

1 is a schematic diagram showing an installation state of a sample in a thermal conductivity measuring apparatus when measuring thermal conductivity.

DESCRIPTION OF THE REFERENCE NUMERALS

1 Upper Heater (Upper Heater) 2 Thermometer

3 samples 4 thermometers

5 Calorimeter 6 Calorimeter

7 Lower heater section (lower heater) 8 Heat sink section

9 cooling chiller part 10 card heater parts (protection heater part)

11 Guard heaters (protective heaters) 12 rows of movement direction

The present invention relates to an adhesive tape or sheet having reflective and / or light shielding properties.

In a so-called "mobile phone" or the like, a liquid crystal display module unit and a backlight unit for a display screen are fixed with an adhesive tape or sheet, and as such an adhesive tape or sheet, an adhesive tape or sheet having reflective or light blocking properties is used. (Japanese Patent Publication No. 2004-59723, Japanese Patent Publication 2002-235053, Japanese Patent Publication 2002-350612, Japanese Patent Publication 2004-161955, Japanese Patent Publication 2004-184443, Japanese Patent Publication 2004 -231736, Japanese Patent Publication 2004-231737, Japanese Patent Publication 2004-156015, Japanese Patent Publication 2004-244499, Japanese Patent Publication 2002-249741, Japanese Patent Publication 2004-53759, See Japanese Patent Application Laid-Open No. 2002-23663).

Conventional reflective and / or light-shielding adhesive tapes or sheets generally have a pressure-sensitive adhesive layer formed on at least one side (one side or both sides) of the substrate when used in fixing the liquid crystal display module unit and the backlight unit. And a reflective tape and sheet having a reflective layer and / or a light shielding layer and having a light shielding layer (sometimes referred to as a "reflective light-shielding adhesive tape or sheet") are used. As such a reflective light-shielding adhesive tape or sheet, a plastic base material (such as a polyethylene terephthalate base material) is usually used as a base material, and the thermal conductivity is in a very low state.

On the other hand, the liquid crystal display module unit and the backlight unit generate heat. Therefore, as a reflective light-shielding adhesive tape or sheet, the reflective light-shielding adhesive tape or sheet which added the function of conducting heat | fever resulting from a liquid crystal display module unit, a backlight unit, etc. and radiating it out of a system is requested | required.

On the other hand, the adhesive face of the reflective light-shielding adhesive tape or sheet is preferably an adhesive face (non-conductive adhesive face) having non-conductive property in order not to cause electrical damage to electronic components such as a liquid crystal display module unit.

Therefore, the objective of this invention is providing the adhesive tape or sheet which has a heat radiating function, and has reflectivity and / or light-shielding property.

Another object of the present invention is to provide a pressure-sensitive adhesive tape or sheet which has a heat dissipation function, has a non-conductive adhesive face, and has reflective and / or light-shielding properties.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to achieve the said objective, when the metal base material which has a specific thickness as a base material is used, the present inventors can add the outstanding thermal conductivity function to the adhesive tape or sheet which has reflective and / or light-shielding property. found. The present invention has been completed in accordance with these findings.

That is, the present invention is a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on at least one side of the base material and having a characteristic that the reflectance of at least one side is 60% or more and / or the transmittance is 0.3% or less. The sheet is an adhesive tape or sheet having reflective and / or light-shielding properties, wherein the substrate is a metal substrate having a thickness of 3 µm or more.

As said metal base material, a metal foil is suitable, and especially an aluminum base material is suitable. In addition, the metal base material may be a metal base material which has a black layer in at least one surface. It is preferable that the adhesive layer of at least one surface of a base material contains a thermally conductive compound.

It is preferable that it is a black layer which shows black, and the light-shielding layer may be an adhesive layer which shows black. It is preferable that a reflective layer is a white layer which shows white, and the adhesive layer which shows white may be sufficient.

Such a reflective light-shielding adhesive tape or sheet can be suitably used for fixing the liquid crystal display module unit and the backlight unit.

The present invention also provides a liquid crystal display device having a liquid crystal display module unit and a backlight unit, wherein the liquid crystal display module unit and the backlight unit are fixed by the reflective light-shielding adhesive tape or sheet. do.

The reflective light-shielding adhesive tape or sheet (adhesive tape or sheet having reflective and / or light-shielding properties) of the present invention has an adhesive layer on at least one side of the substrate, and has a reflectance on at least one side of 60% or more and // Or has a transmittance of 0.3% or less, and is further characterized in that the substrate is a metal substrate having a thickness of 3 μm or more.

Thus, since the reflective light-shielding adhesive tape or sheet uses a metallic substrate having a specific thickness as the substrate, the heat generated in the system can conduct heat in the metallic substrate to radiate heat out of the system. Therefore, when the reflective light-shielding adhesive tape or sheet is used, the heat generated in the device can be effectively radiated to the outside of the device without accumulating heat in the device, thereby preventing or preventing damage to the device (thermal damage) due to heat. Can significantly increase the stability.

On the other hand, the reflective light-shielding adhesive tape or sheet of the present invention has an adhesive layer on one side or both sides of the base material, and the characteristic and / or transmittance of the reflectance of at least one side of 60% or more is 0.3% or less. It has a characteristic. When the reflective light-shielding adhesive tape or sheet has the property that the reflectance of at least one surface is 60% or more, the reflectance on the surface where the reflectance is 60% or more is 60% or more (eg, 60 to 100). %] Is not particularly limited, and the higher the value is, the more preferable. Reflective light-shielding adhesive tape or sheet WHEREIN: As a reflectance in the surface whose reflectance becomes 60% or more, Preferably it is 70% or more (more preferably, 80% or more).

On the other hand, the reflectance (diffuse reflectance) (%) of the predetermined surface in the reflective light-shielding adhesive tape or sheet was made by using a spectrophotometer (device name "MPS-2000" manufactured by Shimadzu Corporation) to reflect light having a wavelength of 550 nm. It irradiates from one surface side (predetermined surface side) of an adhesive tape or sheet | seat, and is calculated | required by measuring the intensity | strength of the light reflected from the surface which irradiated the said light.

In addition, when the reflective light-shielding adhesive tape or sheet has the characteristic that the transmittance is 0.3% or less, the transmittance of the reflective light-shielding adhesive tape or sheet is not particularly limited as long as it is 0.3% or less [0 to 0.3%]. The lower it is, the more preferable. As transmittance | permeability of a reflective light-shielding adhesive tape or sheet, Preferably it is 0.1% or less [More preferably, 0.05% or less], Especially, it is suitable that it is 0.03% or less [especially 0.01% or less].

On the other hand, the transmittance (%) of the reflective light-shielding adhesive tape or sheet is one side of the reflective light-shielding adhesive tape or sheet by using a spectrophotometer (device name "U4100 type spectrophotometer" manufactured by Hitachi, Ltd.). It calculates | requires by measuring the intensity | strength of the light which irradiated from and transmitted to the other surface side.

(Metal base)

The reflective light-shielding adhesive tape or sheet of the present invention uses a metal substrate (metal foil or the like) having a thickness of 3 µm or more as a substrate. As thickness of a metal base material, if thickness is 3 micrometers or more, it will not specifically limit, For example, it can select suitably from the range of 5-150 micrometers (preferably 10-100 micrometers, More preferably, 15-75 micrometers).

On the other hand, since the metal deposition layer deposited by the metal deposition method on a nonmetallic substrate (eg, a plastic substrate) is usually less than 1 μm (eg, 0.01 to 0.1 μm), the thermal conductivity is low and the thickness is 3 μm. It is excluded from the above metallic base material. However, for example, when the thickness of the metal deposition layer is 3 μm or more by forming any number of metal deposition layers, the metal deposition layer can be used as a metal substrate having a thickness of 3 μm or more. Therefore, the metal vapor deposition layer whose thickness is 3 micrometers or more can be included in the metal base material whose thickness is 3 micrometers or more.

As such a metal base material, if a metal base material is 3 micrometers or more in thickness, it will not specifically limit. As a material or raw material of a metal base material, the metal material etc. which consist only of metal elements, such as a metal element single body and an alloy, can be used. Specifically, as a metal element of the metal material which becomes a metallic element single body, Periodic group 1 elements, such as lithium, sodium, potassium, rubidium, cesium; Group 2 elements of the periodic table such as magnesium, calcium, strontium and barium; Periodic table Group 3 elements such as scandium, yttrium, lanthanoid elements (lanthanum, cerium, etc.), actinoid elements (actinium, etc.); Group 4 elements of the periodic table such as titanium, zirconium and hafnium; Periodic table Group 5 elements such as vanadium, niobium, and tantalum; Chromium, molybdenum, tungsten, etc .; Group 7 elements of the periodic table such as manganese, technetium, and rhenium; Group 8 elements of periodic table such as iron, ruthenium, and osmium; Group 9 elements of the periodic table such as cobalt, rhodium, and iridium; Nickel, palladium, platinum and the like; Group 11 elements of the periodic table such as copper, silver, and gold; Group 12 elements of the Periodic Table such as zinc, cadmium, and mercury; Group 13 elements of the periodic table such as aluminum, gallium, indium and thallium; Group 14 elements of the periodic table such as tin, lead, etc .; And Group 15 elements of the periodic table such as antimony, bismuth and the like. Meanwhile, as the alloy, for example, stainless steel, copper-nickel alloy, brass, nickel-chromium alloy, iron-nickel alloy, zinc-nickel alloy, gold-copper alloy, tin-lead alloy, silver-tin-lead alloy, nickel-chromium Iron alloys, copper-manganese-nickel alloys, nickel-manganese-iron alloys, and the like. These metal materials can be used individually or in combination of 2 or more types.

As the metal material, aluminum, copper, silver, gold, iron, nickel and stainless are suitable, and aluminum and copper (particularly aluminum) are suitable. Therefore, as a metal base material, an aluminum base material and a copper base material (especially an aluminum base material) can be used suitably.

The metal base material may have any form of a single layer and a multilayer.

The metal substrate may include, for example, known additives such as fillers, flame retardants, antioxidants, antistatic agents, softeners, ultraviolet absorbers, antioxidants, plasticizers, surfactants, and the like, as necessary.

The formation method of a metal base material is not specifically limited, For example, a rolling method, an electrolysis method, etc. are mentioned.

In this invention, the metal base material (it may be called "the metal base material with a black layer") which has a black layer on at least one surface can be used as a metal base material. Of course, it is important that the thickness of the metal base material with a black layer is 3 micrometers or more. Such a black base material with a black layer can be used as a light-shielding layer containing metal base material in which the light-shielding layer (especially the light-shielding layer whose transmittance | permeability is 0.3% or less) and the metal base material which have the outstanding thermal conductivity were integrated. Of course, one or two or more light-shielding layers, light-shielding pressure-sensitive adhesive layers, etc. may be further formed on the light-shielding layer-containing metal substrate.

The formation method of the metal base material with a black layer is not restrict | limited, For example, the brush roller coating, the spray coating method, the electrostatic coating method, the electrolytic coating method, the powder coating method, the baking. A painting method, a letterpress printing method, a gravure printing method, a trial printing method, and the like.

On the other hand, the black color material used in producing the metal base material with black layer is not particularly limited as long as it is a black color material that can be attached to the metal base material, but an inorganic black pigment can be suitably used, for example. Specifically, as the black color material, carbon black (furnace black, channel black, acetylene black, thermal black, lamp black, etc.), graphite, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, cyanine black, activated carbon , Ferrite (nonmagnetic ferrite, magnetic ferrite, etc.), magnetite, chromium oxide, iron oxide, molybdenum disulfide, chromium complex, complex oxide-based black pigment, and the like. A black color material can be used individually or in combination of 2 or more types.

(Reflective layer)

As the reflective light-shielding adhesive tape or sheet of the present invention, when the reflectance of one surface is 60% or more, the reflective light-shielding adhesive tape or sheet has a reflective layer for making the reflectance of one surface to 60% or more. As the reflective layer, it is important to have a reflectance capable of making the reflectance of the predetermined surface of the reflective light-shielding adhesive tape or sheet 60% or more. Therefore, as the reflectance of the reflective layer, it is important that the reflectance of the reflective light-shielding adhesive tape or sheet is 60% or more [60-100%], preferably 70% or more [more preferably 80% or more], Especially, it is suitable that it is 85% or more.

The reflective layer may be a layer that exhibits reflective properties, and may be any layer such as an adhesive layer, a substrate, a resin layer, an ink layer (printing layer, etc.). On the other hand, the reflective layer should be formed in a form such that the reflectance of one surface of the reflective light-shielding adhesive tape or sheet becomes 60% or more in order to reflect the light irradiated onto one surface of the reflective light-shielding adhesive tape or sheet. For example, it may be formed in the form exposed to one surface of a reflective light-shielding adhesive tape or sheet, and even if it is formed in the form located in the inner surface side of the layer which has transparency (for example, a transparent adhesive layer or a transparent base material). good. On the other hand, when a reflective light-shielding adhesive tape or sheet has a light-shielding layer as shown below, it is preferable that a reflective layer is formed in the surface by the side of a base material with respect to a light-shielding layer.

In addition, a reflective layer can be formed with various materials (adhesive composition, resin composition, ink composition, etc.) which can exhibit reflectivity.

As such a reflective layer, although the white layer which shows white, the silver layer which shows silver color, etc. are mentioned, for example, the white layer which shows white can be used suitably. In the white layer, white basically means that L ^* defined in the L ^* a ^* b ^* color system is 87 or more (87 to 100) [preferably 90 or more (90 to 100), more preferably 92 or more (92 To 100)]. In addition, a ^* and b ^* prescribed | regulated by L ^* a ^* b ^* colorimeter can be suitably selected according to the value of L ^* , respectively. As a ^* or b ^* , it is preferable that both are the range of -10-10 (especially -5-5), and both are especially 0 or almost 0 (range of -2-2).

In addition, silver basically means the silver-based index whose L ^* prescribed | regulated by L ^* a ^* b ^* color system becomes 70-90 (preferably 72-88, more preferably 75-85). In addition, a ^* and b ^* prescribed | regulated by L ^* a ^* b ^* colorimeter can be suitably selected according to the value of L ^* , respectively. As a ^* or b ^* , it is preferable that both are the range of -10-10 (especially -5-5), and both are especially 0 or almost 0 (range of -2-2).

In addition, in this invention, L ^* , a ^* , b ^* prescribed | regulated by L ^* a ^* b ^* colorimeter is calculated | required by measuring using a color difference meter (brand name "CR-200" Minolta company; color difference meter). The L ^* a ^* b ^* color system is the color space recommended by the International Illumination Commission (CIE) in 1976 and is the color space referred to as the CIE1976 (L ^* a ^* b ^* ) color system. In addition, L ^* a ^* b ^* colorimeter is prescribed | regulated to JIS Z 8729 by Japanese Industrial Standard.

The reflective layer such as the white layer or the silver layer may be formed of, for example, a white ink composition mainly containing a white color material as a color material, or a silver ink composition mainly containing a silver color material as a color material. When directly forming, it is preferable that it is a white resin layer (especially a white film layer) and a silver resin layer (especially a silver film layer). Examples of such a white resin layer include a resin layer formed of a resin composition containing a white resin, a resin layer formed of a resin composition containing a white color material, and the like. Moreover, the resin layer etc. which were formed of the resin composition containing a silver system material are mentioned as a silver system resin layer.

On the other hand, as a white color material or a silver color material, any color material (coloring agent), such as a pigment and dye, may be used, but a pigment can be used suitably. Specifically, examples of the white color material include titanium oxide (titanium dioxide such as rutile titanium dioxide and anatase titanium dioxide), zinc oxide, aluminum oxide, silicon oxide, zirconium oxide, magnesium oxide, calcium oxide, tin oxide, barium oxide, Cesium oxide, yttrium oxide, magnesium carbonate, calcium carbonate (hard calcium carbonate, heavy calcium carbonate, etc.), barium carbonate, zinc carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, aluminum silicate, magnesium silicate, calcium silicate, barium sulfate , Calcium sulfate, barium stearate, zinc oxide, zinc sulfide, talc, silica, alumina, clay, kaolin, titanium phosphate, mica, gypsum, white carbon, diatomaceous earth, bentonite, lithopone, Inorganic white color materials, such as zeolite, celite, and hydrous halide site, acrylic resin particle, polystyrene resin particle, polyurethane resin particle, and ami There may be mentioned formaldehyde-based resin particles, melamine resin particles and so on, such as an organic coloring material baekgye-type resin particles, polycarbonate type resin particles, silicone resin particles, urea. A fluorescent brightener may be used as the white color material, and the fluorescent brightener may be appropriately selected from known fluorescent brighteners. A white color material can be used individually or in combination of 2 or more types.

Moreover, silver, aluminum, etc. are mentioned as a silver-based color material, for example. Silver-based color material can be used individually or in combination of 2 or more types.

The ink composition (white ink composition, silver ink composition, etc.) for forming a reflective layer contains a binder, a dispersing agent, a solvent, etc. as needed other than a coloring material. On the other hand, the binder is not particularly limited, and examples thereof include polyurethane resins, phenolic resins, epoxy resins, urea melamine resins, silicone resins, phenoxy resins, methacryl resins, acrylic resins, polyallylate resins, and polyester resins. Resin (polyethylene terephthalate, etc.), polyolefin resin (polyethylene, polypropylene, ethylene-propylene copolymer, etc.), polystyrene resin (polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene- Maleic anhydride copolymer, acrylonitrile-butadiene-styrene resin, etc.), polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyvinylidene chloride, polycarbonate, cellulose (cellulose acetate resin) , Ethyl cellulose resins, and the like, and known resins (thermoplastic resins, thermosetting resins, and sights) such as polyacetal Hwaseong resin, etc.) etc. are mentioned. A binder can be used individually or in combination of 2 or more types.

Moreover, as resin (resin of other color, such as transparent resin other than a white resin), in resin composition for forming a white resin layer (especially a white film layer) and a silver resin layer (especially a silver film layer). For example, polyester (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, etc.), polyolefin (polyethylene, polypropylene, ethylene-propylene copolymer, etc.), polyvinyl alcohol, polyvinylidene chloride , Polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyamide, polyimide, cellulose, fluorine resin, polyether, polystyrene resin (polystyrene and the like), polycarbonate, polyether sulfone, and the like. have. On the other hand, when using a white color material or a silver color material, it is preferable to use transparent resin as resin. Resin can be used individually or in combination of 2 or more types.

On the other hand, in a reflective layer, a silver layer can be formed even if it uses the vapor deposition method by the metal component which can show silver-based colors, such as silver and aluminum. As the vapor deposition method, a vacuum deposition method (vacuum deposition method), a physical sputtering method, a chemical sputtering method, or the like can be adopted.

Although the reflective layer may have any form of a single layer and a multilayer, it is preferable to have a multilayer form from a viewpoint of further improving reflectivity. Therefore, it is preferable that a reflective light-shielding adhesive tape or sheet has a reflective layer of a multilayer structure (especially a white layer of a multilayer structure). On the other hand, when the reflective layer has a multilayered form, the number of layers of the reflective layer may be two or more, and for example, it may be appropriately selected from the range of 2 to 10, and preferably 2 to 6 (more preferably 2 to 4). , Especially 2).

On the other hand, in the case where the reflective layer has a multilayered form, the reflectance of the entire reflective layer in the multilayered form, not the reflectance of the reflective layer of each layer, is adjusted so that the reflectance of the reflective light-shielding adhesive tape or sheet is 60% or more. It is important.

The thickness of the reflective layer (when the reflective layer is a multilayer structure, the thickness of the entire multilayer structure reflective layer) is not particularly limited, and can be appropriately selected from the range of 5 to 150 μm (preferably 10 to 100 μm). As the reflective layer, the thickness of the silver layer formed by the vapor deposition method is not particularly limited, and may be, for example, 0.3 to 2 µm (preferably 0.4 to 1 µm, more preferably 0.4 to 0.5 µm).

In addition, in this invention, when a metal base material is a metal base material which shows silver colors, such as an aluminum base material and a silver base material, it is possible to use the metal base material which shows silver as a silver layer as a reflective layer. In addition, when the metal base material is a metal base material which does not show silver color, such as a copper base material or a gold base material, as a silver layer as a reflective layer, it may be a vapor deposition layer by the metal component which can show silver-based colors, such as silver and aluminum.

In the present invention, when the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer (white pressure-sensitive adhesive layer) showing white or a pressure-sensitive adhesive layer (silver pressure-sensitive adhesive layer), it is possible to use a white pressure-sensitive adhesive layer as a white layer as a reflective layer. It is possible to use a silver adhesive layer as a silver layer as a layer.

In the present invention, the reflective layer may be any of a substrate (i.e., a reflective substrate), an adhesive layer (i.e., a reflective adhesive layer), a layer provided on the substrate, and the like. As said reflective base material, the metal base material which shows silver color is used, and an aluminum base material is suitable. Moreover, a white adhesive layer is suitable as a reflective adhesive layer. Moreover, as a reflective layer provided on the base material, a white resin layer is suitable.

On the other hand, when the reflective layer has a multilayered form, a reflective base material or a reflective pressure sensitive adhesive layer may be included as a layer included in the multilayered reflective layer. Specifically, as the layer structure of the reflective layer, for example, a reflective base material (such as a base made of aluminum) as a base material and one or two or more reflective layers (such as a white-based film layer) formed on the reflective base material Etc.), a reflective substrate (such as an aluminum substrate) as a substrate, one or two or more reflective layers (such as a white resin layer such as a white film layer) formed on the reflective substrate, and the reflective layer As a layer structure which consists of a reflective adhesive layer (white adhesive layer etc.) as an adhesive layer formed on it, As a reflective base material (such as an aluminum base material) as a base material, and a reflective adhesive layer (white adhesive layer etc.) as an adhesive layer formed on the said reflective base material The layer structure etc. which were comprised are mentioned.

In addition, the reflective layer may have a multilayer form by a white layer and a silver layer. Thus, when the reflective layer has a white layer and a silver layer, for example, at least one of the white layer and the silver layer may be a reflective substrate or a reflective pressure-sensitive adhesive layer. Specifically, as described above, the multi-layered form in which the silver layer is a base made of aluminum as a base material and the white layer is a white resin layer, or the silver layer is a base made of aluminum as the base material, and the white layer is a white pressure-sensitive adhesive layer The multilayer form of the structure which is a layer, etc. are mentioned.

The method for forming the reflective layer is not particularly limited, and may be appropriately selected from known methods for forming the reflective layer, depending on the kind of the reflective layer, the layer structure, and the like. Specifically, when the reflective layer is formed of, for example, a resin composition containing a white resin or a resin composition containing a white color material, and is a white resin layer provided on a metal substrate, as a method of forming a white resin layer, Using the resin composition for forming a white resin layer, it shape | molds into a sheet form using shaping | molding methods, such as extrusion molding, inflation molding, and calender molding, and the said sheet-like resin layer is formed on a metal base material. The lamination | stacking method etc. are mentioned. In the case where the reflective layer is a silver layer, the silver layer as the reflective layer can be formed also by a method using a vapor deposition method as described above. Of course, when the reflective layer is a multilayer reflective layer containing a reflective substrate or a reflective pressure-sensitive adhesive layer, the reflective layer can be formed by using a method in which the above methods are combined.

(Shading layer)

The reflective light-shielding adhesive tape or sheet of the present invention has a light-shielding layer for setting the transmittance of the reflective light-shielding adhesive tape or sheet to 0.3% or less when the transmittance is 0.3% or less. As a light-shielding layer, it is important to have the transmittance | permeability which can make the transmittance | permeability of a reflective light-shielding adhesive tape or sheet 0.3% or less. Therefore, as the transmittance of the light-shielding layer, it is important that the transmittance of the reflective light-shielding adhesive tape or sheet is 0.3% or less [0 to 0.3%], preferably 0.1% or less [more preferably 0.05% or less], Especially, it is suitable that it is 0.03% or less [especially 0.01% or less].

On the other hand, since the transmittance of the light-shielding layer corresponds to (or matches) the transmittance of the reflective light-shielding adhesive tape or sheet, even if the light-shielding layer is not taken out from the reflective light-shielding adhesive tape or sheet, By measuring the transmittance, the transmittance of the light shielding layer can be determined.

As such a light-shielding layer, what is necessary is just a layer which exhibits light-shielding property, for example, may be any layer, such as an adhesive layer, a base material, a resin layer, an ink layer (printing layer, etc.). On the other hand, a light-shielding layer can be formed with various materials (adhesive composition, resin composition, ink composition, etc.) which can exhibit light-shielding property.

In this invention, the black layer which shows black is suitable as a light shielding layer. In the black layer, black is basically L ^* a ^* b ^* L ^* defined in the color system is 35 or less (0 to 35) [preferably 30 or less (0 to 30), more preferably 25 or less (0 To 25)]. In addition, a ^* and b ^* prescribed | regulated by L ^* a ^* b ^* colorimeter can be suitably selected according to the value of L ^* , respectively. As a ^* or b ^* , it is preferable that both are the range of -10-10 (especially -5-5), and both are especially 0 or almost 0 (range of -2-2).

Such light-shielding layers such as the black layer are, for example, a black ink composition mainly comprising a black color material as a color material, a cyan color material (cyan color material), and a magenta color material (deficit). ) Colorant) and yellow colorant (yellow colorant) may be formed by a mixed ink composition or the like mixed with each other. However, when directly formed on the metal substrate, it is a black resin layer (especially a black color film layer). It is preferable. Examples of such a black resin layer include a resin layer formed of a resin composition containing a black color material.

In addition, light-shielding layers, such as a black layer, can be formed by the resin layer formed by the resin composition containing a cyan-based color material, the resin layer formed by the resin composition containing a magenta-type color material, and the resin composition containing a yellow color material. It may be comprised by the multilayered structure of a layer.

In addition, as these color materials, although any color materials (coloring agents), such as a pigment and dye, may be used, a pigment can be used suitably.

Specifically, examples of the black color material include carbon black (furnace black, channel black, acetylene black, thermal black, lamp black, etc.), graphite, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, cyanine black, and activated carbon. , Ferrite (nonmagnetic ferrite, magnetic ferrite and the like), magnetite, chromium oxide, iron oxide, molybdenum disulfide, chromium complex, complex oxide black pigment, anthraquinone organic black pigment, and the like. A black color material can be used individually or in combination of 2 or more types.

In the cyan-based color material, for example, C.I. Pigment Blue 1, East 2, East 3, East 15, East 15: 1, East 15: 2, East 15: 3, East 15: 4, East 15: 5, East 15: 6, East 16, East 17, East 17: 1, East 18, East 22, East 25, East 56, East 60, East 63, East 65, East 66; C.I. Bat Blue 4; 60, C.I. Pigment green 7 and the like. In addition, in the cyan-based color material, as a dye (cyan-based dye), for example, C.I. Solvent blue 25, east 36, east 60, east 70, east 93, east 95; C.I. Acid blue 6, copper 45 and the like.

In addition, in a magenta color material, as a pigment (magenta pigment), it is C.I. Pigment Red 1, East 2, East 3, East 4, East 5, East 6, East 7, East 8, East 9, East 10, East 11, East 12, East 13, East 14, East 15, East 16, East 17, East 18, East 19, East 21, East 22, East 23, East 30, East 31, East 32, East 37, East 38, East 39, East 40, East 41, East 42, East 48, Fig. 48 : 1, East 48: 2, East 48: 3, East 48: 4, East 49, East 49: 1, East 50, East 51, East 52, East 52: 2, East 53: 1, East 54, East 55 , East 56, East 57: 1, East 58, East 60, East 60: 1, East 63, East 63: 1, East 63: 2, East 64, East 64: 1, East 67, East 68, East 81, East 83, east 87, east 88, east 89, east 90, east 92, east 101, east 104, east 105, east 106, east 108, east 112, east 114, east 122, east 123, east 139, east 144 East 146, East 147, East 149, East 150, East 151, East 163, East 166, East 168, East 170, East 171, East 172, East 175, East 176, East 177, East 178, East 179, East 184, East 185, East 187, East 190, East 193, East 202, East 206, East 207, East 209, East 219, East 222, East 224, East 238, East 245; C.I. Pigment violet 3, east 9, east 19, east 23, east 31, east 32, east 33, east 36, east 38, east 43, east 50; C.I. Bat red 1, 2, 10, 13, 15, 23, 29, 35, etc. are mentioned.

In addition, in the magenta color material, as a dye (magenta dye), for example, C.I. Solvent Red 1, East 3, East 8, East 23, East 24, East 25, East 27, East 30, East 49, East 52, East 58, East 63, East 81, East 82, East 83, East 84, East 100, 109, 111, 121, 122; C.I. Disperse Red 9; C.I. Solvent violet 8, copper 13, copper 14, copper 21, copper 27; C.I. Disperse violet 1; C.I. Basic Red 1, East 2, East 9, East 12, East 13, East 14, East 15, East 17, East 18, East 22, East 23, East 24, East 27, East 29, East 32, East 34, East 35, 36, 37, 38, 39, 40; C.I. Basic violet 1, 3, 7, 10, 14, 15, 21, 25, 26, 27, 28, etc. are mentioned.

In addition, in a yellow color material, as a pigment (yellow pigment), it is C.I. Pigment orange 31, east 43; C.I. Pigment Yellow 1, East 2, East 3, East 4, East 5, East 6, East 7, East 10, East 11, East 12, East 13, East 14, East 15, East 16, East 17, East 23, East 24, East 34, East 35, East 37, East 42, East 53, East 55, East 65, East 73, East 74, East 75, East 81, East 83, East 93, East 94, East 95, East 97 , East 98, East 100, East 101, East 104, East 108, East 109, East 110, East 113, East 114, East 116, East 117, East 120, East 128, East 129, East 133, East 138, East 139, East 147, East 150, East 151, East 153, East 154, East 155, East 156, East 167, East 172, East 173, East 180, East 185, East 195; C.I. Bat yellow 1, east 3, east 20, etc. are mentioned. In addition, in a yellow color material, as dye (yellow dye), it is C.I. Solvent yellow 19, east 44, east 77, east 79, east 81, east 82, east 93, east 98, east 103, east 104, east 112, east 162.

In the mixed ink composition, the cyan-based colorant, the magenta-based colorant, and the yellow-based colorant may be used alone or in combination of two or more kinds. On the other hand, L is defined in the cyan-based coloring material in the mixed ink composition, the magenta-based coloring material and a yellow-based coloring material mixing ratio (or blending ratio) blackish color (e. G., As the L ^* a ^* b ^* color system ^*, a ^* and b ^* Is not particularly limited as long as it can represent a black color in the above range, and can be appropriately selected depending on the type of each color material. The cyan color material, magenta color material and yellow color material content ratio in the mixed ink composition is, for example, cyan color material / magenta color material / yellow color material = 10 to 50% by weight relative to the total amount of the color material. It may be appropriately selected from the range of weight% / 10 to 50% by weight (preferably 20 to 40% by weight / 20 to 40% by weight / 20 to 40% by weight).

The ink composition (black ink composition, mixed ink composition, etc.) for forming a light shielding layer contains a binder, a dispersing agent, a solvent, etc. as needed other than a coloring material. Moreover, as a binder, the binder etc. which were illustrated as a binder contained in an ink composition (white ink composition / silver-based ink composition etc.) in the term of the said reflective layer are mentioned, for example.

In the black resin layer (especially the black film layer), as the resin used, for example, a white resin layer (especially a white film layer) or a silver resin layer (especially a silver film layer) in the term of the reflective layer. Suitable resin (especially transparent resin) can be selected and used out of resin illustrated as resin in the resin composition for forming the resin.

In this invention, although the light-shielding layer may have any form of a single | mono layer and a multilayer, it is preferable to have a multilayer form. Therefore, it is preferable that the reflective light-shielding adhesive tape or sheet has a light-shielding layer of a multilayer structure (especially a black layer of a multilayer structure). Thus, by making a light shielding layer into a multilayered structure, the light shielding property of a light shielding layer can be improved further. On the other hand, when the light-shielding layer has a multilayered form, the number of layers of the light-shielding layer may be 2 or more, for example, appropriately selected from the range of 2 to 10, preferably 2 to 8 (more preferably 2 to 6). )to be.

On the other hand, when the light-shielding layer has a multilayered form, the transmittance of the entire light-shielding layer of the multilayered form, not the transmittance of the light-shielding layer of each layer, is adjusted so that the transmittance of the reflective light-shielding adhesive tape or sheet is 0.3% or less. It is important.

The thickness of the light shielding layer is not particularly limited. For example, when the light-shielding layer is a resin layer or a printing layer (light-shielding printing layer), the thickness of the resin layer or the light-shielding printing layer (when the light-shielding layer is a multilayered structure, the total thickness of the light-shielding layer) is 0.5 to 20 µm. (Preferably 3 to 15 µm, more preferably 5 to 10 µm). In addition, when a light-shielding layer is a base material and an adhesive layer, it can select from the range of the thickness of the base material illustrated below and the thickness of an adhesive layer as thickness of a light-shielding layer.

In addition, in this invention, when a metal base material is a metal base material with a black layer, it is possible to use the metal base material with a black layer as a black layer as a light-shielding layer. In addition, when an adhesive layer is an adhesive layer (black adhesive layer) which shows black, it is possible to use a black adhesive layer as a black layer as a light-shielding layer.

In the present invention, the light shielding layer may be any of a substrate (ie, a light-shielding substrate), an adhesive layer (ie, a light-shielding adhesive layer), a layer provided on the substrate, and the like. As said light-shielding base material, the metal base material with a black layer is suitable. Moreover, as a light-shielding adhesive layer, a black adhesive layer is suitable. Moreover, as a light-shielding layer provided on the base material, a black resin layer is suitable.

On the other hand, when the light-shielding layer has a multilayer form, the light-shielding base material or the light-shielding pressure-sensitive adhesive layer may be included as a layer included in the light-shielding layer of the multilayer form. Specifically, as the layer structure of the light-shielding layer, for example, a light-shielding substrate (such as a metal substrate with a black layer) as a substrate and one or two or more layers of light-shielding layers (black-based films, layers, etc.) formed on the light-shielding substrate Layer structure by a resin layer, etc., light-shielding base material (metal base material with a black layer etc.) as a base material, and one or two or more light-shielding layers (black-based resin layers, such as a black film layer) formed on the said light-shielding base material Etc.) and the layer structure by the light-shielding adhesive layer (black adhesive layer etc.) as an adhesive layer formed on the said light-shielding layer, the light-shielding base material (metal substrate with a black layer etc.) as a base material, and the adhesive formed on the said light-shielding base material The laminated constitution etc. by the light-shielding adhesive layer (black adhesive layer etc.) as a layer are mentioned.

The formation method of a light-shielding layer is not specifically limited, It can select suitably from the well-known method of forming a light-shielding layer according to the kind, layer structure, etc. of a light-shielding layer. Specifically, in the case where the light-shielding layer is formed of a resin composition containing a black-based color material and is provided on a metal substrate, for example, a resin composition for forming a black-based resin layer as a method of forming a black-based resin layer The method of shaping | molding to a sheet form using shaping | molding methods, such as extrusion molding, inflation shaping | molding, a calender shaping | molding, and laminating | stacking the said sheet-like resin layer on a metal base material, etc. are mentioned. Of course, when a light-shielding layer is a multilayer light-shielding layer containing a light-shielding base material or a light-shielding adhesive layer, a light-shielding layer can be formed by using the method which combined the said method.

(Other layer)

The reflective light-shielding adhesive tape or sheet of the present invention may further have another layer. When the reflective light-shielding adhesive tape or sheet has, for example, a black layer as the light-shielding layer and a white layer or silver layer as the reflective layer, for example, a color other than black or a color other than black is exhibited between the black layer and the white layer or the silver layer. You may have a layer (especially the reflective light-shielding adjustment layer which can be adjusted by being changed in steps from one side to the other side, respectively). Thus, by providing the reflective light shielding adjustment layer between the reflective layer and the light shielding layer as another layer (that is, forming the reflective layer, the reflective light shielding adjustment layer, and the light shielding layer in this order), the reflective light shielding adhesive tape Alternatively, the sheet can be exhibited step by step from the light shielding layer side to the reflective layer side in terms of light shielding properties, and from the reflective layer side to the light shielding layer side in terms of reflective properties.

In the layer showing a color other than black, white and silver, any color other than black, white and silver may be any color other than black, white and silver, for example, red, blue, yellow, green, yellow green, orange And purple, gray, and gold. On the other hand, silver and gray may be sufficient as colors other than black and white, and white may be sufficient as colors other than black and silver.

(Pressure-sensitive adhesive layer)

The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer in the reflective light-shielding pressure-sensitive adhesive tape or sheet is not particularly limited and is, for example, urethane pressure sensitive adhesive, acrylic pressure sensitive adhesive, rubber pressure sensitive adhesive, silicone pressure sensitive adhesive, polyester pressure sensitive adhesive, polyamide pressure sensitive adhesive, epoxy pressure sensitive adhesive, vinyl Known adhesives, such as an alkyl ether adhesive and a fluorine adhesive, are mentioned. An adhesive can be used individually or in combination of 2 or more types. In addition, the adhesive may be an adhesive which has any form, for example, an emulsion type adhesive, a solvent type adhesive, a hot melt adhesive (hot melt type adhesive), etc. are mentioned.

As an adhesive, an acrylic adhesive and a rubber-based adhesive can be used suitably. The acrylic pressure sensitive adhesive contains an acrylic polymer as a main component or base polymer. Although it does not restrict | limit especially as an acryl-type polymer, It is preferable that (meth) acrylic-acid alkylester (alkyl acrylate ester, methacrylic acid alkyl ester) is used as a main structural monomer component (monomer main component). Specifically, examples of the alkyl (meth) acrylate ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate and isobutyl (meth) acrylate. S-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isoamyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, (meth 2-ethylhexyl acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isonyl (meth) acrylate, decyl (meth) acrylate, isdecyl (meth) acrylate, (meth ) Acrylic acid undecyl, (meth) acrylic acid dodecyl, etc. are mentioned. (Meth) acrylic-acid alkylester can be used individually or in combination of 2 or more types.

As a monomer component which comprises an acryl-type polymer, if the (meth) acrylic-acid alkylester is used as a monomer component, the other monomer component (it may be called a "copolymerizable monomer component") copolymerizable with the (meth) acrylic-acid alkylester may be used. good. On the other hand, it is preferable to use it as a (meth) acrylic-acid alkylester in the ratio of 50 weight% or more with respect to the monomer component whole quantity which comprises an acrylic polymer. When the proportion of the alkyl (meth) acrylate ester is less than 50% by weight based on the total amount of the monomer components constituting the acrylic polymer, the properties (adhesiveness, etc.) as the acrylic polymer may be hardly expressed.

As the copolymerizable monomer component, it can be used to introduce a crosslinking point into the acrylic polymer or to increase the cohesion force of the acrylic polymer. The copolymerizable monomer components may be used alone or in combination of two or more thereof.

Specifically, as the copolymerizable monomer component, in order to introduce a crosslinking point into the acrylic polymer, a functional group-containing monomer component (particularly, a heat crosslinkable functional group-containing monomer component for introducing a crosslinking point that is thermally crosslinked into the acrylic polymer) can be used. As such a functional group containing monomer component, if it is a monomer component which can copolymerize with (meth) acrylic-acid alkylester and has a functional group which becomes a crosslinking point, it will not specifically limit, For example, (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid Carboxyl group-containing monomers such as fumaric acid and isocrotonic acid or acid anhydrides thereof (maleic anhydride, itaconic anhydride, etc.); Hydroxyl groups, such as vinyl alcohol and allyl alcohol, in addition to hydroxyalkyl (meth) acrylates, such as 2-hydroxy ether (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl (meth) acrylate Containing monomers; (Meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, N- Amide monomers such as methoxymethyl (meth) acrylamide and N-butoxymethyl (meth) acrylamide; Amino group-containing monomers such as aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate; Epoxy group-containing monomers such as glycidyl (meth) acrylate and methylglycidyl (meth) acrylate; Cyano-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, N-methylvinylpyrrolidone, N-vinylpyridine, N-vinylpiperidone, N-vinylpyrimidine, N-vinylpiperazine, N-vinylpyrazine, N-vinylpyrrole And monomers having nitrogen atom-containing rings such as N-vinylimidazole, N-vinyl oxazole, N-vinyl morpholine, N-vinyl caprolactam, and N- (meth) acryloyl morpholine. As the functional group-containing monomer component, a carboxyl group-containing monomer such as acrylic acid or an acid anhydride thereof can be suitably used.

Moreover, as a copolymerizable monomer component, in order to raise the cohesion force of an acryl-type polymer, another copolymerizable monomer component can be used. As another copolymerizable monomer component, For example, vinyl ester type monomers, such as vinyl acetate and a vinyl propionate; Styrene-based monomers, such as styrene, substituted styrene ((alpha) -methylstyrene), and vinyltoluene; Non-aromatic ring containing (meth), such as (meth) acrylic-acid cycloalkyl ester [cyclohexyl (meth) acrylic acid, cyclopentyl di (meth) acrylate, etc.), and carbonyl (meth) acrylate, and isobornyl (meth) acrylate Acrylic acid esters; (Meth) acrylic acid aryl esters [phenyl (meth) acrylate etc.], (meth) acrylic acid aryloxyalkyl esters [such as phenoxyethyl (meth) acrylate], and (meth) acrylic acid arylalkyl esters [(meth) acrylic acid benzyl ester] Aromatic ring-containing (meth) acrylic acid esters such as these; Olefin monomers such as ethylene, propylene, isoprene, butadiene and isobutylene; Vinyl chloride, vinylidene chloride; Isocyanate group-containing monomers such as 2- (meth) acryloyloxyethyl isocyanate; Alkoxy-group containing monomers, such as methoxy ethyl (meth) acrylate and ethoxy ethyl (meth) acrylate; In addition to vinyl ether monomers such as methyl vinyl ether and ethyl vinyl ether, 1,6-hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate , Triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, (Poly) propylene glycol di (meth) acrylate, neopentylglycol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol Tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin di (meth) acrylate, epoxy acrylate, polyester acrylate, right And the like shot acrylate, divinylbenzene, butyl di (meth) acrylate, hexyl di (meth) acrylate of a polyfunctional monomer.

Examples of the rubber-based adhesive include natural rubber, styrene-isoprene-styrene block copolymer (SIS block copolymer), styrene-butadiene-styrene block copolymer (SBS block copolymer), and styrene-ethylene butylene-styrene block air Copolymer (SEBS block copolymer), styrene-butadiene rubber, polybutadiene, polyisoprene, polyisobutylene, butyl rubber, chloroprene rubber, silicone rubber, acrylonitrile-butadiene rubber, ethylene-propylene And rubber pressure sensitive adhesives having a rubber component such as a terpolymer as the base polymer.

Meanwhile, the pressure-sensitive adhesive may contain, for example, known additives such as a crosslinking agent, a crosslinking agent, a tackifying resin, a filler, a flame retardant, an anti-aging agent, an antistatic agent, a softener, a UV absorber, an antioxidant, a plasticizer, a surfactant, and the like. .

The pressure-sensitive adhesive layer may have any form of a single layer or a multilayer.

On the other hand, the pressure-sensitive adhesive layer is a black layer as a light-shielding layer (light-shielding pressure-sensitive adhesive layer), a white layer or a silver layer as a reflective layer (reflective pressure-sensitive adhesive layer), the color material according to the color shown (black color material, white color material, silver color material, etc.) It may contain. Specifically, for example, the light-shielding pressure-sensitive adhesive layer may contain a black color material, or may contain a mixed color material of a cyan color material, a magenta color material, and a yellow color material. Such black-based color material, cyan-based color material, magenta-based color material, and yellow-based color material can be appropriately selected from among the black-based color material, cyan-based color material, magenta-based color material, and yellow-based color material exemplified in the above-mentioned light-shielding layer. For example, the reflective adhesive layer may contain a white-based colorant or a silver-based colorant, and such a white-based colorant and a silver-based colorant can be suitably selected from the white-based color material and silver-based colorant which were illustrated by the term of the said reflective layer.

Since the reflective light-shielding adhesive tape or sheet of the present invention is used for fixing a liquid crystal display module unit and a backlight unit in an electronic device such as a "mobile phone", etc., the viewpoint of suppressing or preventing the electrical damage of the applied electronic device is prevented. In the adhesive layer, it is preferable to have a non-conductive property. Therefore, it is preferable to use the color material which has nonelectroconductivity as a color material to be contained in an adhesive layer. As a color material which has nonelectroconductivity, what has nonelectroconductivity can be selected suitably from the various color materials illustrated above, and can be used. For example, the light-shielding adhesive layer which has a non-conductive property can be formed by using the mixed color material of a cyan color material, a magenta color material, and a yellow color material, without using the black color material which has electroconductivity, such as carbon black.

In addition, when an adhesive layer is not a black layer as a light-shielding layer (light-shielding adhesive layer), a white layer as a reflective layer (reflective adhesive layer), or a silver layer, it may be called the adhesive layer which has transparency ("transparent adhesive layer"). ) Can be suitably used.

In the present invention, the pressure-sensitive adhesive layer may contain a thermally conductive compound. That is, the pressure-sensitive adhesive layer may be a pressure-sensitive adhesive layer (heat conductive pressure-sensitive adhesive layer) having thermal conductivity. Thus, if an adhesive layer is a thermally conductive adhesive layer, an adhesive layer can also exhibit thermal conductivity with a base material, and can further improve the heat dissipation function of a reflective light-shielding adhesive tape or sheet.

Although it will not restrict | limit especially if it is a compound which has thermal conductivity as a thermally conductive compound, A metal type compound, carbon black, etc. can be used. A thermally conductive compound can be used individually or in combination of 2 or more types.

As a metal type compound as a thermally conductive compound, the metal type compound which consists only of metal elements, such as a metal element single substance and an alloy, may be sufficient, and the metal type compound containing a nonmetallic element with a metal element may be sufficient. In these metal compounds, the metal element can be appropriately selected from the metal elements exemplified in the metal base section.

Moreover, as a metal type compound containing a nonmetallic element with a metal element, for example, alumina, silica, zinc oxide, aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, tin oxide, barium oxide, cesium oxide, Metal oxides such as yttrium oxide, iron oxide, and cerium oxide; Metal nitrides such as aluminum nitride, boron nitride, silicon nitride, magnesium nitride, lithium nitride, chromium nitride, tungsten nitride, and molybdenum nitride; Metal carbides such as silicon carbide, boron carbide, zirconium carbide, tantalum carbide, titanium carbide and iron carbide; Metal hydroxides, such as aluminum hydroxide, calcium hydroxide, magnesium hydroxide, and zinc hydroxide, etc. are mentioned.

In the present invention, from the viewpoint of suppressing or preventing electrical damage of the applied electronic device, a compound having a thermal conductivity and a non-conductive compound (a thermal conductive compound having a non-conductive property) can be suitably used as the thermal conductive compound. Examples of the thermally conductive compound having a non-conductive property include those having a non-conductive property (for example, metal oxides such as alumina, silica, zinc oxide, and aluminum oxide; metal nitrides such as aluminum nitride, boron nitride, and silicon nitride) among the thermally conductive compounds exemplified above. Metal carbides such as silicon carbide and boron carbide, metal hydroxides such as aluminum hydroxide, and the like.

In addition, in this invention, when a heat conductive compound has various colors, such as white and black, it can be used also as a color material which has heat conductivity. For example, a white thermally conductive compound (for example, alumina, silica, etc.) can be used as the thermally conductive compound and the white colorant, thereby forming a reflective adhesive layer having thermal conductivity.

It does not restrict | limit especially as thickness of an adhesive layer, For example, it can select suitably from the range of 2-100 micrometers (preferably 5-80 micrometers).

The formation method of an adhesive layer is not specifically limited, For example, a method of apply | coating an adhesive on a predetermined surface, drying or hardening as needed, or apply | coating an adhesive on a separator (peeling liner), and drying it as needed After hardening and forming an adhesive layer, the method etc. which bond and transfer the said adhesive layer on a predetermined surface are mentioned. On the other hand, a conventional coating machine (for example, a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, etc.) may be used when the adhesive is applied.

The reflective light-shielding adhesive tape or sheet of the present invention has a metal substrate as described above, and has a form as an adhesive tape or sheet of a substrate attachment type. The reflective light-shielding adhesive tape or sheet has a metal base material having a thickness of 3 μm or more, and one or two pressure-sensitive adhesive layers formed on at least one side (one side or both sides) of the metal base, and the reflectance of at least one side is 60%. The above and / or transmittance is 0.3% or less. The reflective light-shielding adhesive tape or sheet specifically includes, for example, the following layer configurations (A1) to (A6), (B1) to (B7), (C1) to (C4), (D1) to (D4), and (E1). Reflective light-shielding adhesive tape or sheet which has (E8), (F1)-(F7), (G1)-(G7), (H1)-(H6), (I1)-(I7), etc. are mentioned Can be.

Layer structure (A1): The layer structure of the metal base material / transparent adhesive layer which shows silver color

Layer structure (A2): Layer structure of the metal base material / transparent adhesive layer which shows a transparent adhesive layer / silver

Layer structure (A3): Layer structure of the metallic substrate / reflective adhesive layer which shows silver color

Layer structure (A4): Layer structure of the metal base material / reflective adhesive layer which shows a transparent adhesive layer / silver

Layer structure (A5): layer structure of the reflective adhesive layer / silver-based metallic substrate / reflective adhesive layer

Layer Configuration (A6): One or two or more reflective layers between the metal substrate exhibiting the silver color in the layer configurations (A1) to (A5) and the adhesive layer (transparent pressure sensitive adhesive layer or reflective pressure sensitive adhesive layer) on one or both sides. Formed layers

Layer structure (B1): The layer structure of the metal base material / light-shielding adhesive layer which shows silver color

Layer structure (B2): The layer structure of the metal base material / light-shielding adhesive layer which shows the reflective layer / silver of one layer or two or more layers

Layer structure (B3): Layer structure of the metal base material / light-shielding adhesive layer which shows a transparent adhesive layer / silver

Layer structure (B4): Layer structure of the reflective adhesive layer / metal base material / light-shielding adhesive layer which shows silver color

Layer structure (B5): The layer structure of the transparent base material layer / light-shielding adhesive layer which made the transparent adhesive layer / 1 layer or the reflective layer / silver of two or more layers / silver color

Layer structure (B6): Reflective pressure-sensitive adhesive layer / 1 layer or two or more layers of reflective layer / silver-based metallic substrate / light-shielding pressure-sensitive adhesive layer

Layer structure (B7): The layer structure in which one or two or more layers of light-shielding layers were formed between the metallic substrate showing the silver color in the layer structures (B1) to (B6) and the light-shielding pressure-sensitive adhesive layer.

Layer structure (C1): The layer structure of the metal base material / light-shielding adhesive layer which shows colors other than silver color

Layer structure (C2): The layer structure of the metal base material / 1 layer or two or more light-shielding layers / light-shielding adhesive layer which show colors other than silver

Layer structure (C3): Layer structure of the metal base material / light-shielding adhesive layer which shows colors other than a transparent adhesive layer / silver color

Layer structure (C4): The layer structure of the metal base material / 1 layer which shows colors other than transparent adhesive layer / silver, or two or more light-shielding layers / light-shielding adhesive layer

Layer structure (D1): The layer structure of the metal base material / reflective adhesive layer which shows colors other than silver

Layer structure (D2): The layer structure of the metal base material / 1 layer which shows colors other than silver, or the reflective layer / reflective adhesive layer of two or more layers

Layer structure (D3): Layer structure of the metal base material / reflective adhesive layer which shows colors other than a transparent adhesive layer / silver

Layer structure (D4): The layer structure of the metal base material / 1 layer which shows colors other than transparent adhesive layer / silver, or two or more reflective layers / reflective adhesive layer

Layer structure (E1): The layer structure of the metal base material / light-shielding adhesive layer which shows one layer or two or more reflective layers / colors other than silver color

Layer structure (E2): The layer structure of the metal base material / light-shielding adhesive layer which shows colors other than a transparent adhesive layer / 1 layer or 2 or more reflective layers / silver color

Layer structure (E3): The layer structure of the metal substance base material / reflective adhesive layer which shows one layer or two or more layers of light-shielding layers / colors other than silver

Layer structure (E4): The layer structure of the metallic base material / reflective adhesive layer which shows colors other than the transparent adhesive layer / 1 layer or two or more light-shielding layers / silver color

Layer structure (E5): Layer structure of the metallic base material / light-shielding adhesive layer which shows colors other than a reflective adhesive layer / silver

Layered constitution (E6): A layer constitution in which one or two or more layers of light-shielding layers were formed between a metal substrate showing a color other than silver in the layer constitutions (E1) to (E2) and (E5) and the light-shielding pressure-sensitive adhesive layer.

Layer structure (E7): The layer structure in which one or two or more reflective layers were formed between the metallic substrate showing the color other than silver in the layer structures (E3) to (E5) and the reflective pressure sensitive adhesive layer.

Layer configuration (E8): Layer configuration in which the layer configuration (E6) and the layer configuration (E7) are combined

Layer structure (F1): The layer structure of the transparent adhesive layer formed in the black layer side in the metal base material with a black layer / metal base material with a black layer which has a black layer on one surface.

Layer structure (F2): The layer structure of the transparent adhesive layer formed in the side in which the black layer in the metal base material with a black layer / metal base material with a black layer which has a black layer on one side is not formed.

Layer structure (F3): The layer structure of the transparent adhesive layer / metal base material with a black layer / transparent adhesive layer which has a black layer on one side.

Layer structure (F4): The layer structure of the light-shielding adhesive layer formed in the black layer side in the metal base material with black layers / metal base material with black layers which has a black layer on one surface.

Layer structure (F5): The transparent adhesive layer formed in the side in which the black layer in the metal base material with a black layer is not formed / in the metal base material with a black layer / metal base material with a black layer which has a black layer on one side. Layer structure of the light-shielding adhesive layer formed on the black layer side

Layer structure (F6): The layer structure of the light-shielding adhesive layer formed in the side in which the black layer in the metal base material with a black layer / metal base material with a black layer which has a black layer on one side is not formed.

Layer structure (F7): In the light-shielding adhesive layer formed in the side in which the black layer in the metal base material with a black layer is not formed, the metal base material with a black layer / metal base material with a black layer which has a black layer on one side. Configuration of the transparent pressure-sensitive adhesive layer formed on the black layer side of the

Layer structure (G1): 1 layer or 2 or more reflective layers formed in the side in which the black layer in the metal substrate with a black layer is not formed / with a black substrate with a black layer which has a black layer on one side Layer structure of the transparent adhesive layer formed in the black layer side in a metal base material

Layer structure (G2): 1 layer or 2 or more reflective layers formed on the side in which the black layer in the metal substrate with a black layer is not formed / with a black substrate with a black layer which has a black layer on one side Layer structure of the light-shielding adhesive layer formed on the black layer side in a metal base material

Layer structure (G3): The layer structure of the transparent adhesive layer formed in the black layer side in the reflective base material / metal base material with a black layer which has a black layer on one surface / metal base material with a black layer.

Layer structure (G4): The layer structure of the light-shielding adhesive layer formed in the black layer side in the metal base material with black layers / metal base material with black layers which has a black layer on one surface.

Layer structure (G5): 1 or 2 or more layers of light-shielding layers between the metal base material with a black layer which has a black layer in one surface in layer structures (G1)-(G4), and a transparent adhesive layer or a light-shielding adhesive layer Formed layers

Layer configuration (G6): Layer configuration in which one or two or more reflective layers are formed between a metal substrate with a black layer having a black layer on one side in the layer configurations (G3) to (G4) and the reflective adhesive layer.

Layer composition (G7): Layer composition combining the layer composition (G5) and the layer composition (G6)

Layer structure (H1): Layer structure of the metal base material / transparent adhesive layer with a black layer which has a black layer on both surfaces.

Layer structure (H2): Layer structure of the metal base material / transparent adhesive layer with a black layer which has a black layer on both sides of a transparent adhesive layer / both sides

Layer structure (H3): Layer structure of the metal base material / light-shielding adhesive layer with a black layer which has a black layer on both surfaces.

Layer structure (H4): The layer structure of the transparent base material layer / metal base material with a black layer / light-shielding adhesive layer which has a black layer on both surfaces.

Layer structure (H5): Layer structure of the light-shielding adhesive layer / metal base material with a black layer which has a black layer on both surfaces / light-shielding adhesive layer

Layer structure (H6): One layer or two layers between the metal base material with a black layer which has a black layer on both surfaces in layer structures (H1)-(H5), and an adhesive layer (transparent adhesive layer or light-shielding adhesive layer). Layer configuration in which the above light shielding layer is formed

Layer structure (I1): The layer structure of the reflective adhesive layer which has a metallic base material / thermal conductivity which shows silver color

Layer structure (I2): Layer structure of the reflective adhesive layer which has a transparent adhesive layer / silver-based metal base material / heat conductivity

Layer structure (I3): Reflective pressure-sensitive adhesive layer / layer structure of the reflective pressure-sensitive adhesive layer having a metallic substrate / thermal conductivity showing a silver color

Layer structure (I4): The layer structure of the reflective adhesive layer which has thermal conductivity / the metal base material / heat conductive which shows silver color, and the reflective adhesive layer which has thermal conductivity

Layer structure (I5): The layer structure of the reflective adhesive layer which has the light-shielding adhesive layer / silver-based metal base material / thermal conductivity

Layer structure (I6): Light-shielding adhesive layer / 1 layer or 2 or more layers light-shielding layer / The layer structure of the reflective base material layer which has a metallic base material / heat conductivity which shows silver color

Layer configuration (I7): A layer configuration in which one or two or more reflective layers are formed between the metallic substrate showing the silver color in the layer configurations (I1) to (I6) and the reflective pressure sensitive adhesive layer or conductive reflective pressure sensitive adhesive layer.

On the other hand, the reflective light-shielding adhesive tape or sheet may have a form in which sheet-like ones are laminated, or may have a form wound in a roll shape.

In addition, in the reflective light-shielding adhesive tape or sheet, the surface of the pressure-sensitive adhesive layer (transparent pressure-sensitive adhesive layer, light-shielding pressure-sensitive adhesive layer, reflective pressure-sensitive adhesive layer, etc.) may be protected by a known separator (peeling liner). In addition, when the reflective light-shielding adhesive tape or sheet has a configuration in which an adhesive layer is formed on only one surface of a metal substrate, for example, a peeling treatment by a known release treatment agent (silicone peeling treatment agent or the like) on the surface (back side) of the metal substrate The surface of an adhesive layer can also be protected by forming a layer and winding in roll shape in the form which the said peeling process layer and an adhesive layer contact.

The reflective light-shielding adhesive tape or sheet of the present invention can be suitably used as a reflective adhesive tape or sheet (reflective adhesive tape or sheet) when the reflectance of one side is 60% or more, and when the transmittance is 0.3% or less It can be suitably used as a pressure-sensitive adhesive tape or sheet (light-shielding pressure-sensitive adhesive tape or sheet), and when the reflectivity of one side is 60% or more and the transmittance is 0.3% or less, an adhesive tape or sheet having reflectivity and light shielding properties (reflectiveness, Light-shielding adhesive tape or sheet). Such a reflective light-shielding adhesive tape or sheet may be an adhesive tape or sheet (double-sided adhesive tape or sheet) in which both surfaces are adhesive surfaces, or may be an adhesive tape or sheet in which only one surface is an adhesive surface.

Therefore, the reflective light-shielding adhesive tape or sheet of the present invention is used in liquid crystal display devices (LCDs) (especially small liquid crystal display devices) and the like used in so-called "mobile phones" or so-called "PDAs". It is useful as a reflective light-shielding adhesive tape or sheet (reflective adhesive tape or sheet, light-shielding adhesive tape or sheet, reflective / shielding adhesive tape or sheet) used for fixing.

In addition, the liquid crystal display device of the present invention has a liquid crystal display module unit and a backlight unit, and the liquid crystal display module unit and the backlight unit have an adhesive layer on at least one surface of the reflective light-shielding adhesive tape or sheet [i.e., And at least one surface has a reflectance of 60% or more and / or a transmittance of 0.3% or less, and further has a structure fixed by a reflective light-shielding adhesive tape or sheet, wherein the substrate is a metal substrate having a thickness of 3 μm or more. . On the other hand, when the reflective light-shielding adhesive tape or sheet has a reflectance on one side of less than 60% and a reflectance on the other side of 60% or more, the surface on the side where the reflectance is less than 60% is located on the liquid crystal display module unit side. The surface on the side where the reflectance is 60% or more may be located on the backlight unit side, and the surface on the side where the reflectance is less than 60% is located on the backlight unit side and the surface on the side where the reflectance is 60% or more is liquid crystal. It may be located on the display module unit side.

<Examples>

Although an Example demonstrates this invention more concretely below, this invention is not limited by these Examples. In addition, in Example, L ^* , a ^* , b ^* prescribed | regulated by the transmittance | permeability (%), a reflectance (%), and the L ^* a ^* b ^* colorimeter were calculated | required with the following measuring methods, respectively.

(Method of measuring transmittance)

Transmittance (%) by measuring the intensity of light transmitted by irradiating light of wavelength 550nm from one side of the adhesive tape or sheet using a spectrophotometer manufactured by Hitachi, Ltd. (device name "U4100 spectrophotometer") to the other side Obtain

(Measurement method of reflectance)

Using a Shimadzu Corporation spectrophotometer (device name "MPS-2000"), light having a wavelength of 550 nm was irradiated to the surface of the white substrate (Examples 1 to 2 or Comparative Example 2) on an adhesive tape or sheet, and the light The reflectance (%) is obtained by measuring the intensity of light reflected from the irradiated surface.

(Measurement method of L ^* , a ^* , b ^* )

L ^* , a ^* , and b ^* as defined by the L ^* a ^* b ^* colorimeter are measured using a color difference meter (CR-200) manufactured by Minolta.

(Preparation example 1 of the adhesive)

Acrylic polymer (Acrylic polymer obtained by superposing | polymerizing using the ratio of 2-ethylhexyl acrylate: 70 weight part, butyl acrylate 30 weight part, acrylic acid: 2 weight part): Polymerization rosin-type resin (brand name "Pencel D125" with respect to 100 weight part) Arakawa Chemical Co., Ltd.): 30 parts by weight, carbon black: 5 parts by weight is added, isocyanate-based crosslinking agent (trade name "Coronate L" manufactured by Nippon Polyurethane Industry Co., Ltd.): 2 parts by weight of the pressure-sensitive adhesive ( Black adhesive) was prepared.

(Preparation Example 2 of Adhesives)

Acrylic polymer (Acrylic polymer obtained by superposing | polymerizing using the ratio of 2-ethylhexyl acrylate: 70 weight part, butyl acrylate: 30 weight part, and acrylic acid: 2 weight part): Polymerization rosin-type resin (brand name "pensel" with respect to 100 weight part D125 ”manufactured by Arakawa Chemical Co., Ltd .: 30 parts by weight, and isocyanate-based crosslinking agent (trade name" Coronate L "manufactured by Nippon Polyurethane Co., Ltd.): 2 parts by weight were added to prepare a pressure-sensitive adhesive (transparent adhesive) having transparency. did.

(Preparation example 3 of an adhesive)

Acrylic polymer (2-ethylhexyl acrylate: 70 parts by weight, butyl acrylate 30 parts by weight, acrylic acid: acrylic polymer obtained by polymerization using a ratio of 2 parts by weight): Polymerized rosin-based resin (product name "Pencel D125") to 100 parts by weight Arakawa Chemical Co., Ltd.): 30 parts by weight of round alumina (trade name "AS-50" from Showa Denko): 70 parts by weight of isocyanate-based crosslinking agent (trade name "Coronate L" Nippon Polyurethane) Industrial Co., Ltd.): 2 weight part was added and the adhesive (heat conductive white adhesive) which has thermal conductivity and shows white was prepared.

(Example 1)

After applying the black adhesive obtained by Preparation Example 1 of the adhesive on one side of the aluminum base material having a thickness of 25 μm and drying it to form a black adhesive layer having a thickness of 30 μm, one side was silicone-based on the black adhesive layer. A transparent pressure-sensitive adhesive having a thickness of 30 μm by overlaying a separator having a constitution in which a peeling treatment was performed with a peeling treatment agent, and applying and drying the transparent pressure-sensitive adhesive obtained in Preparation Example 2 of the pressure-sensitive adhesive on the exposed side of the aluminum base material. After forming a layer (transparent adhesive layer), the separator which has the structure which peeling process was performed on one surface on the said transparent adhesive layer with the silicone type peeling agent was superimposed, and a layer of a transparent adhesive layer / aluminum base material / black adhesive layer The double-sided adhesive tape which has a structure was obtained.

In addition, it was 0% when the transmittance | permeability of the double-sided adhesive tape or sheet obtained by Example 1 was measured by said (method of measuring the transmittance). Further, the with respect to the surface of the black adhesive layer side of the double-sided pressure-sensitive adhesive tape or sheet (L ^*, a ^*, b ^* method of measurement) in the L ^* defined in L ^* a ^* b ^* color system by, a ^*, b ^* a As a result, L ^* was 28.0, a ^* was 0.48 and b ^* was 1.33.

(Example 2)

The transparent adhesive obtained by the preparation example 2 of the adhesive was apply | coated and dried on the surface of the black layer side of the aluminum base material which has a black layer on one side and is 30 micrometers thick, and forms the transparent adhesive layer of thickness 35 micrometers, and then the said transparent Preparation of an adhesive on the surface (exposed surface) of the side in which the separator which has a structure in which one surface peeled off by the silicone type peeling agent on the adhesive layer was not formed, and the black layer of the aluminum base material was not formed. After apply | coating and drying the transparent adhesive obtained by Example 2, and forming the transparent adhesive layer of thickness 35 micrometers, the separator which has a structure by which one surface was peeled off with the silicone type peeling agent was superimposed on the said transparent adhesive layer, , A double-sided adhesive tape or sheet having a laminated structure of an aluminum base material / transparent pressure-sensitive adhesive layer having a black layer on one side of the transparent pressure-sensitive adhesive layer / side was obtained. .

In addition, when the transmittance | permeability of the double-sided adhesive tape or sheet obtained by Example 2 was measured like Example 1, it was 0%. Further, in the double-sided pressure-sensitive adhesive tapes or sheets, L ^* defined in L ^* a ^* b ^* color system with respect to the surface of the black layer side of the aluminum substrate with a black layer on one side, a ^*, b ^* of embodiment example 1 As measured in the same manner, L ^* was 24.0, a ^* was 0.23, and b ^* was 0.80.

(Example 3)

On one side of the aluminum base material having a thickness of 25 μm, a thermally conductive white adhesive obtained by Preparation Example 3 of the adhesive was applied and dried to form a white adhesive layer (thermally conductive white adhesive layer) having a thermal conductivity of 30 μm in thickness. Thereafter, one side of the separator was formed on the thermally conductive white pressure-sensitive adhesive layer having a configuration in which the peeling treatment was carried out by a silicone-based peeling treatment agent, and on the exposed side of the aluminum base material, a pressure-sensitive adhesive obtained by Preparation Example 2 of the pressure-sensitive adhesive was obtained. After apply | coating a transparent adhesive and drying it to form the 30-micrometer-thick transparent adhesive layer, the separator which has a structure which peeling process was performed by the silicone type | system | group peeling agent on one side on the said transparent adhesive layer was overlaid, and transparent adhesive layer / aluminum The double-sided adhesive tape or sheet which has the laminated constitution of the base material / heat conductive white adhesive layer was obtained.

On the other hand, when the transmittance of the double-sided adhesive tape or sheet obtained in Example 3 was measured in the same manner as in Example 1, it was 0%. Moreover, it was 69% when the reflectance of the surface on the heat conductive white adhesive layer side of a double-sided adhesive tape or sheet was measured by said (measuring method of a reflectance). Further, in the double-sided pressure-sensitive adhesive tape or sheet, the thermally conductive white adhesive L which is defined in the L ^* a ^* b ^* color system with respect to the surface of the layer side ^*, a ^*, b ^* by the exemplary measured as in Example 1 Bar, L ^* Was 91.8, a ^* was -0.8, and b ^* was -0.5.

(Example 4)

After applying the thermally conductive white adhesive obtained by Preparation Example 3 of the adhesive on one side of an aluminum base material having a thickness of 25 μm and drying to form a thermally conductive white adhesive layer having a thickness of 30 μm, the thermally conductive white adhesive layer was formed on the surface. On one side, a separator having a configuration in which the peeling treatment was performed with a silicone-based peeling treatment agent was overlaid, and the black pressure sensitive adhesive obtained in Preparation Example 1 of the pressure-sensitive adhesive was applied to the exposed surface of the aluminum substrate and dried to have a thickness of 30 μm. After the black pressure sensitive adhesive layer was formed, a separator having a constitution in which one side was subjected to a peel treatment with a silicone-based peeling agent on the black pressure sensitive adhesive layer was superimposed, and the black pressure sensitive adhesive layer / aluminum base material / thermally conductive white pressure sensitive adhesive layer was A double-sided adhesive tape or sheet having a layer structure was obtained.

In addition, when the transmittance | permeability of the double-sided adhesive tape or sheet obtained by Example 4 was measured like Example 1, it was 0%. In addition, L ^* with respect to the surface of the black adhesive layer side of the double-sided pressure-sensitive adhesive tape or sheet for a ^* b ^* L as defined in the color space ^*, a ^*, b ^* by the exemplary measured as in Example 1 Bar, L ^* is 28.0, a ^* was 0.48 and b ^* was 1.33.

Moreover, it was 68% when the reflectance of the surface on the heat conductive white adhesive layer side of a double-sided adhesive tape or sheet was measured like Example 3. Further, in the double-sided pressure-sensitive adhesive tape or sheet, the thermally conductive white adhesive L which is defined in the L ^* a ^* b ^* color system with respect to the surface of the layer side ^*, a ^*, b ^* by the exemplary measured as in Example 1 Bar, L ^* Was 90.8, a ^* was -1.3 and b ^* was -0.3.

(Example 5)

On one side of the aluminum base material having a thickness of 25 μm, a thermally conductive white adhesive obtained by Preparation Example 3 of the adhesive was applied and dried to form a white adhesive layer (thermally conductive white adhesive layer) having a thermal conductivity of 30 μm in thickness. Thereafter, one side of the separator was formed on the thermally conductive white pressure-sensitive adhesive layer having a configuration in which the peeling treatment was performed by a silicone-based peeling treatment agent, and on the exposed side of the aluminum base material, it was obtained by Preparation Example 3 of the pressure-sensitive adhesive. After coating and drying the thermally conductive white adhesive to form a thermally conductive white adhesive layer having a thickness of 30 μm, a separator having a constitution in which one side has a peeling treatment with a silicone-based peeling agent is stacked on the thermally conductive white adhesive layer. Oh, double-sided adhesive tape which has a laminated constitution of a thermally conductive white adhesive layer / aluminum base material / thermally conductive white adhesive layer Or a sheet was obtained.

On the other hand, when the transmittance of the double-sided adhesive tape or sheet obtained in Example 5 was measured in the same manner as in Example 1, it was 0%. Moreover, it was 69% and 70%, respectively, when the reflectance of the surface of the heat conductive white adhesive layer side of both surfaces of the double-sided adhesive tape or sheet was measured like Example 3. Further, in the double-sided pressure-sensitive adhesive tape or sheet, with respect to the surface of both heat conductive white pressure-sensitive adhesive layer side L ^* a ^* b ^* L as defined in the color space ^*, a ^*, b ^* by the exemplary measured as Example 1 bar, As for the surface on one side of the thermally conductive white adhesive layer, L ^* is 875, a ^* is -1.03, b ^* is 2.86, and L ^* is 87.6 on the surface of the other thermally conductive white adhesive layer side. a ^* was -0.96 and b ^* was 2.78.

(Comparative Example 1)

A transparent pressure-sensitive adhesive layer / polyethylene terephthalate film / in the same manner as in Example 1 except that a polyethylene terephthalate base material (total thickness: 40 μm) in which an aluminum deposition layer (thickness: 0.05 μm) was formed on one side instead of the aluminum base material was used. The double-sided adhesive tape or sheet which has a laminated constitution of a black adhesive layer was obtained.

(Comparative Example 2)

A transparent pressure-sensitive adhesive layer / polyethylene terephthalate film / in the same manner as in Example 3 except that a polyethylene terephthalate substrate (total thickness: 40 µm) having an aluminum deposition layer (thickness: 0.05 µm) formed on one surface instead of the aluminum substrate was used. The double-sided adhesive tape or sheet which has a laminated constitution of a thermally conductive white adhesive layer was obtained.

(Comparative Example 3)

A black pressure-sensitive adhesive layer / polyethylene terephthalate film / in the same manner as in Example 4 except that a polyethylene terephthalate base material (total thickness: 40 μm) having an aluminum deposition layer (thickness: 0.05 μm) formed on one side instead of the aluminum base material was used. The double-sided adhesive tape or sheet which has a laminated constitution of a thermally conductive white adhesive layer was obtained.

(evaluation)

In order to evaluate the thermal conductivity of the double-sided adhesive tapes or sheets obtained in Examples 1 to 5 and Comparative Examples 1 to 3, the thermal conductivity was determined by the following (Measuring method of thermal conductivity), and the results shown in Table 1 Was obtained. From Table 1, both the double-sided adhesive tapes or sheets according to Examples 1 to 5 have high thermal conductivity and are excellent in thermal conductivity. Therefore, it was confirmed that both of the double-sided adhesive tapes or sheets according to Examples 1 to 5 had good heat dissipation.

On the other hand, the double-sided adhesive tapes or sheets according to Comparative Examples 1 to 3 have low thermal conductivity and low thermal conductivity.

(Method of measuring thermal conductivity)

The thermal conductivity of the double-sided adhesive tape or sheet is measured according to the protective hot plate type flat plate comparison method (ASTM E1530-93). In the above-described protective hot plate type flat plate comparison method, the heat flow rate W flowing in the thickness direction of the sample is measured by a heat flow meter to obtain a thermal resistance R _S (m ² · K / W), and the thermal conductivity is expressed by the following equation (1). λ (W / m · K) is obtained.

[In Formula 1, λ is thermal conductivity (W / m · K), d is thickness (m), and Rs is thermal resistance (m ² · K / W).]

The thermal resistance R _S (m ² · K / W) in the above formula (1) can be obtained by the following formula (2). In Equation 2 below, the contact thermal resistance R _int between the proportional constant F and the sample and the upper and lower heater parts is calibrated for each temperature with a standard sample in advance, and a value obtained by linearly interpolating the actual measured temperature is employed. do.

[Equation 2, Rs is the thermal resistance (m ² · K / W), F is the proportional constant, T _U is the temperature between the upper heater and the sample, T _M is the temperature between the sample and the heat flow meter, T _L is The temperature between the heat flow meter and the lower heater, R _int, is the contact thermal resistance between the sample and the upper and lower heaters.]

Specifically, using a device name "UNITHERM 2021 type" (manufactured by ANTER Co., Ltd.) as a thermal conductivity measuring device, a sample (diameter (φ): disk-shaped double-sided adhesive tape or sheet having a diameter of 50 mm) was placed at a predetermined position of the thermal conductivity measuring device. It is installed in the form shown in Fig. 1, heated by the upper and lower heater parts, and the temperature difference is placed on the upper and lower surfaces of the sample, and the heat flux W at this time is measured by a heat flow meter (calorimeter). The thermal conductivity (W / m · K) is obtained using equations 1 and 2.

1 is a schematic diagram which shows the installation state of the sample in a heat conductivity measuring apparatus (device name "UNITHERM 2021 type" ANTER company make) in measuring a heat conductivity. 1, 1 is an upper heater part (upper heater), 2 is a thermometer, 3 is a sample, 4 is a thermometer, 5 is a heat flow meter (calorimeter), 6 is a thermometer, 7 is a lower heater part (lower heater), 8 9 is a heat sink part, 9 is a cooling chiller part, 10 is a card heater part (protective heater part), 11 is a guard heater part (protective heater part), and 12 is a moving direction of heat.

According to the adhesive tape or sheet which has the reflective and / or light-shielding property of this invention, since it has the said structure, it has a heat radiation function. Moreover, it has a nonelectroconductive adhesive surface. Therefore, by using the adhesive tape or sheet which has the reflective and / or light-shielding property of this invention, the heat | fever in the apparatus which has a heat generating body can radiate | emitted out of an apparatus, and stability of an apparatus can be improved.

Claims (13)

A pressure-sensitive adhesive tape or sheet having a pressure-sensitive adhesive layer on at least one side of the base material and having a property that the reflectance of at least one side is 60% or more and / or the transmittance is 0.3% or less, wherein the base material is thick. It is a metal base material of 3 micrometers or more, The adhesive tape or sheet which has reflective and / or light-shielding property. The method of claim 1, The adhesive tape or sheet | seat which has a reflective and / or light-shielding property whose metal base material is metal foil. The method of claim 1, The adhesive tape or sheet | seat which has a reflective and / or light-shielding property whose metal base material is an aluminum base material. The method of claim 1, The adhesive tape or sheet | seat whose metal base material is a metal base material which has a black layer in at least one surface. The method of claim 1, The adhesive tape or sheet | seat which has the reflective and / or light-shielding property in which the adhesive layer on at least one surface of a base material contains a thermally conductive compound. The method of claim 1, A reflective tape or sheet having reflective and / or light shielding, further comprising a light shielding layer. The method according to claim 6, The adhesive tape or sheet | seat which has a reflective and / or light-shielding property which is a black layer in which a light shielding layer shows black. The method according to claim 6, The adhesive tape or sheet which has a reflective and / or light-shielding property which is an adhesive layer in which a light shielding layer shows black. The method of claim 1, A reflective tape or sheet having reflective and / or light shielding, further comprising a reflective layer. 10. The method of claim 9, An adhesive tape or sheet having reflective and / or light shielding properties, wherein the reflective layer is a white layer exhibiting white color. 10. The method of claim 9, The adhesive tape or sheet which has reflective and / or light-shielding property which is an adhesive layer in which a reflective layer shows white. The method of claim 1, Adhesive tape or sheet having reflective and / or light shielding properties for fixing the liquid crystal display module unit and the backlight unit. A liquid crystal display device having a liquid crystal display module unit and a backlight unit, wherein the liquid crystal display module unit and the backlight unit are fixed by an adhesive tape or sheet having reflective and / or light shielding properties according to claim 1. Display device.

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