JP5562297B2 - Adhesive tape or sheet - Google Patents

Description

  The present invention relates to an adhesive tape or sheet.

  In so-called “mobile phones” and the like, the liquid crystal display module unit related to the display screen and the backlight unit are fixed with an adhesive tape or sheet, and such an adhesive tape or sheet has reflectivity and light shielding properties. Adhesive tapes or sheets are used (see Patent Documents 1 to 12).

JP 2004-59723 A JP 2002-235053 A JP 2002-350612 A JP 2004-161955 A JP 2004-184443 A JP 2004-2331736 A JP 2004-231737 A JP 2004-156015 A JP 2004-244499 A Japanese Patent Laid-Open No. 2002-249741 JP 2004-53759 A JP 2002-23663 A

  In a conventional pressure-sensitive adhesive tape or sheet having a light-shielding property (light-shielding pressure-sensitive adhesive tape or sheet), a black layer colored black is used as a light-shielding layer that exhibits light-shielding properties. In such a light-shielding pressure-sensitive adhesive tape or sheet, the base material and the pressure-sensitive adhesive layer can be configured to have non-conductivity or low conductivity, but the black layer as the light-shielding layer is usually an inexpensive carbon. Since it is formed of a conductive black pigment such as black, it has conductivity. However, since the black layer is usually formed between the base material and the pressure-sensitive adhesive layer and is not exposed on the surface, the problem of conductivity does not occur as it is. However, when a member having a sharp tip portion (for example, a tip portion of a solder part) is bonded to the light-shielding pressure-sensitive adhesive tape or sheet having the black layer, the sharp tip portion of the member has a pressure-sensitive adhesive layer. It may pierce and reach the black layer, make contact, become conductive, and damage the member.In addition, the device or part using the light-shielding adhesive tape or sheet may be damaged by the conduction. May occur.

  Accordingly, an object of the present invention is to provide a pressure-sensitive adhesive tape or sheet that can exhibit non-conductivity or low conductivity even though it has light shielding properties.

  As a result of intensive studies to achieve the above object, the present inventors have found that when a layer having a specific surface resistivity is used as the light-shielding layer, the adhesive tape or sheet is non-conductive or low-conductive. It was found that the sex can be effectively exhibited. The present invention has been completed based on these findings.

That is, the present invention is an adhesive tape or sheet having a transmittance of 0.3 (%) or less and a reflectance of at least one surface of less than 60 (%),
The resistivity of at least one of the surfaces having a reflectance of less than 60 (%) is 10 ¹² (Ω / □) or more, and the following layer configurations (A1) to (A7), (B1) (B8), (C1) to (C5), or (D1) to (D9).
Layer structure (A1): Transparent base material / 1 layer or two or more light-shielding layers / transparent pressure-sensitive adhesive layer layer structure (A2): Light-shielding base material / 1 layer or two or more light-shielding layers / Layer constitution of transparent adhesive layer Layer constitution (A3): Transparent base material / 1 layer or two or more light shielding layers / layer constitution of light shielding adhesive layer Layer constitution (A4): Light shielding base material / 1 layer or Layer constitution of two or more light-shielding layers / light-shielding pressure-sensitive adhesive layer Layer constitution (A5): Layer constitution of one layer or two or more light-shielding layers / transparent substrate / transparent pressure-sensitive adhesive layer Layer constitution (A6): Layer structure of one or two or more light-shielding layers / light-shielding base materials / transparent pressure-sensitive adhesive layers Layer constitution (A7): Substrates in layer constitutions (A1) to (A4) (transparent base materials or light-shielding base materials) ) Surface (exposed surface), or the surface of the light-shielding layer (exposed surface) in the layer structures (A5) to (A6), the transparent adhesive layer or Layer constitution in which a light-sensitive adhesive layer is formed Layer constitution (B1): Layer constitution of transparent substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers / transparent adhesive layer Layer constitution (B2): Reflective substrate / one or two or more reflective layers / one layer or two or more light-shielding layers / transparent adhesive layer constitution Layer constitution (B3): reflective substrate / Layer configuration of 1 layer or 2 or more light-shielding layers / transparent pressure-sensitive adhesive layer Layer structure (B4): 1 layer or 2 or more reflective layers / Transparent substrate / 1 layer or 2 or more light-shielding layers / Layer constitution of transparent adhesive layer Layer constitution (B5): one layer or two or more reflective layers / light-shielding substrate / one layer or two or more light-shielding layers / layer constitution of transparent adhesive layer Layer constitution (B6): Layer configuration of one or two or more reflective layers / reflective substrate / one layer or two or more light-shielding layers / transparent adhesive layer Layer configuration (B7): Layer configuration (B1) to (B3 The surface (exposed surface) of the substrate (transparent substrate or reflective substrate) or the surface of the reflective layer (exposed surface) in the layer configurations (B4) to (B6) Layer configuration in which a transparent pressure-sensitive adhesive layer or a reflective pressure-sensitive adhesive layer is formed Layer configuration (B8): Transparent pressure-sensitive adhesive layer in the layer configurations (B1) to (B6), or on the light-shielding layer in the layer configuration (B7) Layer structure in which the transparent adhesive layer on the side formed in the above is a light-shielding pressure-sensitive adhesive layer Layer structure (C1): Transparent substrate / 1 layer or two or more light-shielding layers / transparent substrate / transparent adhesive Layer configuration (C2): Light-shielding substrate / 1 layer or two or more light-shielding layers / Transparent substrate / Transparent adhesive layer configuration Layer configuration (C3): Light-shielding substrate / 1 Layer structure of layer or two or more light-shielding layers / light-shielding substrate / transparent adhesive layer Layer structure (C4): Light-shielding substrate / one layer or two layers or more Layer structure of upper light-shielding layer / light-shielding base material / light-shielding pressure-sensitive adhesive layer Layer structure (C5): Surface of substrate (transparent substrate or light-shielding base material) in layer structures (C1) to (C4) ( Layer structure in which a transparent pressure-sensitive adhesive layer or a light-shielding pressure-sensitive adhesive layer is formed on the exposed surface) Layer structure (D1): Transparent substrate / 1 layer or two or more reflective layers / 1 layer or Layer structure of two or more light-shielding layers / transparent substrate / transparent adhesive layer Layer structure (D2): Transparent substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers Layer structure (D3): transparent substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers / light-shielding substrate / Layer structure of light-shielding pressure-sensitive adhesive layer Layer structure (D4): The transparent substrate on the side formed on the reflective layer in the layer structures (D1) to (D3) is a reflective substrate. Configuration Layer configuration (D5): Layer configuration of one layer or two or more reflective layers / transparent substrate / one layer or two or more light-shielding layers / transparent substrate / transparent adhesive layer Layer configuration (D6): Layer configuration of one or two or more reflective layers / transparent substrate / one or two or more light-shielding layers / light-shielding substrate / transparent adhesive layer Layer structure (D7): one layer or two or more layers Layer structure of reflective layer / transparent substrate / one or more light-shielding layers / light-shielding substrate / light-shielding pressure-sensitive adhesive layer Layer configuration (D8): Reflection in layer configurations (D5) to (D7) Layer configuration in which the transparent substrate on the side formed between the light-shielding layer and the light-shielding layer is a reflective substrate Layer configuration (D9): Base material in layer configurations (D1) to (D4) (transparent Layer structure in which a transparent adhesive layer or a reflective adhesive layer is formed on the surface (exposed surface) of the substrate or reflective substrate

The pressure-sensitive adhesive tape or sheet of the present invention has a light-shielding layer for making the transmittance of the pressure-sensitive adhesive tape or sheet 0.3 (%) or less, as an outermost layer or in contact with the pressure-sensitive adhesive layer. Among the surfaces having a reflectance of less than 60%, at least the resistivity on the surface side where the light-shielding layer is provided as the outermost layer or in contact with the pressure-sensitive adhesive layer is 10 ¹² (Ω / □). ) Or more. The light-shielding layer may be a printed layer formed between the base material and the pressure-sensitive adhesive layer.

  In addition, the pressure-sensitive adhesive tape or sheet of the present invention has a light-shielding layer for reducing the transmittance of the pressure-sensitive adhesive tape or sheet to 0.3 (%) or less in a form in which both surfaces are sandwiched between substrates. May be.

  In the present invention, the light-shielding layer may be a black layer exhibiting black. Such a black layer is preferably formed of a mixed ink composition in which a cyan color material, a magenta color material, and a yellow color material are mixed, and may have a multilayer structure.

  Further, the adhesive tape or sheet of the present invention may have a reflectance of one surface of 60 (%) or more, and in this case, the reflectivity for making the reflectance of one surface 60 or more (%). It is preferable that the layer is formed on the surface on the substrate side with respect to the light-shielding layer. As the reflective layer, a white layer exhibiting white or a silver layer exhibiting silver is suitable.

  Such an adhesive tape or sheet can be suitably used for fixing the liquid crystal display module unit and the backlight unit.

The present invention is also 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 adhesive tape or sheet. A liquid crystal display device is provided.
In addition, in this specification, it is an adhesive tape or sheet | seat which has an adhesive layer in at least one surface of a base material, and the transmittance | permeability is 0.3 (%) or less, Comprising: The reflectivity is less than 60 (%) and the resistivity on at least one surface side of the surfaces where the reflectivity is less than 60 (%) is 10 ¹² (Ω / □) or more. The characteristic adhesive tape or sheet is also described.

  According to the pressure-sensitive adhesive tape or sheet of the present invention, since it has the above configuration, it can exhibit non-conductivity or low conductivity even if it has light shielding properties.

The pressure-sensitive adhesive tape or sheet of the present invention has a base material and a pressure-sensitive adhesive layer formed on at least one surface of the base material, and has a transmittance of 0.3 (%) or less. The reflectance of one surface is less than 60 (%), and the resistivity of at least one of the surfaces having a reflectance of less than 60 (%) is 10 ¹² [Ω / □ (or Ω / sq.)] Or more.

Thus, since the transmittance | permeability is 0.3 (%) or less, the adhesive tape or sheet | seat has the outstanding light-shielding property, and also at least one of the surfaces where a reflectance is less than 60 (%). Since the resistivity on the surface side is 10 ¹² (Ω / □) or more, excellent non-conductivity or low conductivity can be exhibited.

  In the present invention, the transmittance of the pressure-sensitive adhesive tape or sheet is not particularly limited as long as it is 0.3 (%) or less [0 to 0.3 (%)], but the lower the better. The transmittance of the adhesive tape or sheet is preferably 0.1 (%) or less [more preferably 0.05 (%) or less], particularly 0.03 (%) or less [particularly 0.01 (%). It is preferable that

  In addition, the transmittance | permeability (%) of an adhesive tape or a sheet | seat uses the Hitachi spectrophotometer (apparatus name "U4100 type spectrophotometer"), and the light of wavelength 550nm is one side of an adhesive tape or a sheet | seat. It is calculated | required by irradiating from the side and measuring the intensity | strength of the light which permeate | transmitted the other surface side.

Moreover, in the adhesive tape or sheet, the resistivity on at least one surface side of the surfaces having a reflectance of less than 60 (%) is 10 ¹² (1 × 10 ¹² ) (Ω / □) or more. Although not particularly limited, it is preferably 5 × 10 ¹² (Ω / □) or more [more preferably 10 ¹³ (1 × 10 ¹³ ) (Ω / □) or more]. The upper limit of the resistivity is not particularly limited, and the higher the resistivity, the more preferable from the viewpoint of non-conductivity or low conductivity.

  In addition, the resistivity (Ω / □) of one surface side of the adhesive tape or sheet is determined using an insulation resistance tester (model number “3154”, measurement probe: “9185 measurement probe”) manufactured by Hioki Electric Co., Ltd. Under the atmosphere of room temperature (20-25 ° C.) and 50% RH, voltage: 100 (V), distance between electrodes: 100 mm Then, after standing still for 60 seconds, it can be obtained by reading the measured value (resistance value). In addition, when the surface on the measurement surface side of the pressure-sensitive adhesive tape or sheet is the pressure-sensitive adhesive layer surface, the electrode tip penetrates the pressure-sensitive adhesive layer and is provided in a form in contact with the pressure-sensitive adhesive layer ( For example, the electrode tip is pressed against the surface on the measurement surface side of the adhesive tape or sheet with a force sufficient to hit the printed layer or the substrate as a light-shielding layer, and the electrode tip is in contact with the adhesive layer Measured at least in contact with the layer provided. On the other hand, when the surface of the pressure-sensitive adhesive tape or sheet on the measurement surface side is not the surface of the pressure-sensitive adhesive layer, measurement is performed with the tip of the electrode in contact with the surface of the pressure-sensitive adhesive tape or sheet on the measurement surface side.

  Therefore, when the surface on the measurement surface side of the pressure-sensitive adhesive tape or sheet is the pressure-sensitive adhesive layer surface, the electrode is at least in contact with the layer provided in such a form that the tip is in contact with the pressure-sensitive adhesive layer, and the side surface is pressure-sensitive adhesive The measured resistivity is the surface resistivity of the layer with the lower resistivity among the layers in contact with the electrode (that is, the surface resistivity of the adhesive layer, or the adhesive layer). Surface resistivity of the layer provided in contact form). On the other hand, when the surface on the measurement surface side of the adhesive tape or sheet is not the surface of the adhesive layer, the measured resistivity is the surface resistivity of the surface on the measurement surface side of the adhesive tape or sheet. Therefore, the resistivity (Ω / □) on one side of the adhesive tape or sheet is basically the same as the surface resistivity (Ω / □) on one side of the adhesive tape or sheet.

As a configuration of the pressure-sensitive adhesive tape or sheet of the present invention, it has a pressure-sensitive adhesive layer on at least one surface of the base material, and has a transmittance of 0.3 (%) or less, and further has at least one surface. The reflectance is less than 60 (%), and the resistivity of at least one surface side of the surfaces where the reflectance is less than 60 (%) is 10 ¹² (Ω / □) or more. Although there will be no restriction | limiting in particular if it exists, The following structure (1) or structure (2) is suitable.
(1) It has a light-shielding layer for reducing the transmittance of the adhesive tape or sheet to 0.3 (%) or less as an outermost layer or in contact with the adhesive layer, and has a reflectance of 60 (% ) Among the surfaces which are less than the above, at least the resistivity on the surface side where the light-shielding layer is provided as the outermost layer or in contact with the pressure-sensitive adhesive layer is 10 ¹² (Ω / □) or more (2 ) Configuration having a light-shielding layer for lowering the transmittance of the adhesive tape or sheet to 0.3 (%) or less in a form in which both surfaces are sandwiched between substrates.

(Light-shielding layer)
Since the adhesive tape or sheet of the present invention has a transmittance of 0.3 (%) or less, it has a light-shielding layer for making the transmittance of the adhesive tape or sheet 0.3 (%) or less. ing. As the light-shielding layer, it is important to have a transmittance capable of setting the transmittance of the adhesive tape or sheet to 0.3 (%) or less. Therefore, it is important that the transmittance of the light-shielding layer is 0.3 (%) or less [0 to 0.3 (%)], preferably 0, similarly to the transmittance of the adhesive tape or sheet. 0.1 (%) or less [more preferably 0.05 (%) or less], and 0.03 (%) or less [particularly 0.01 (%) or less] is preferable.

  The transmittance of the light-shielding layer corresponds to (or coincides with) the transmittance of the pressure-sensitive adhesive tape or sheet. Therefore, the transmittance of the pressure-sensitive adhesive tape or sheet can be obtained without separating the light-shielding layer from the pressure-sensitive adhesive tape or sheet. By measuring the transmittance of the light-shielding layer.

  Such a light-shielding layer may be any layer that exhibits light-shielding properties, and may be any layer such as a pressure-sensitive adhesive layer, a base material, an ink layer (printing layer, etc.), for example. In the present invention, the light-shielding layer is a printing layer (in particular, a printing layer formed between the substrate and the pressure-sensitive adhesive layer, or a printing layer formed between the substrate and the substrate). Is preferred. That is, as the light-shielding layer, when the pressure-sensitive adhesive tape or sheet has the configuration (1), a printed layer formed between the substrate and the pressure-sensitive adhesive layer is preferable, while the configuration (2) When it has, the printing layer formed between the base materials is preferable.

The pressure-sensitive adhesive tape or sheet of the present invention has a resistivity on at least one surface side of 10 ¹² (Ω / □) or more, and the resistivity is the outermost layer or the pressure-sensitive adhesive as the outermost layer. Since the surface resistivity is about the layer in contact with the adhesive layer, the light-shielding layer is provided, for example, in the form as the outermost layer or in the form in contact with the adhesive layer (for example, formed as the outermost layer) The pressure-sensitive adhesive layer, the base material or the printed layer, or the printed layer formed between the base material and the pressure-sensitive adhesive layer), the resistivity on the surface side of either the adhesive tape or the sheet May correspond to (or match) the surface resistivity of the light-shielding layer. Therefore, when the light-shielding layer is formed as the outermost layer or when it is formed in a form in contact with the pressure-sensitive adhesive layer [that is, when the pressure-sensitive adhesive tape or sheet has the configuration (1)]. It is important that the surface resistivity is 10 ¹² (Ω / □) or more [preferably 5 × 10 ¹² (Ω / □) or more, more preferably 10 ¹³ (Ω / □) or more]. Thus, when the light-shielding layer is provided as an outermost layer or in a form in contact with the pressure-sensitive adhesive layer, the light-shielding layer preferably has non-conductivity or low conductivity.

Moreover, as a light-shielding layer, when both surfaces are formed in the form pinched | interposed into the base material (namely, when formed in the form which has a layer structure of a base material / light-shielding layer / base material) (for example, The light-shielding layer is blocked by the substrate, so that the adhesive tape or sheet is excellent even if it has a light-shielding layer. Further, non-conductivity or low conductivity can be exhibited. As described above, when the light-shielding layer is formed in a form in which both surfaces are sandwiched between base materials [that is, when the pressure-sensitive adhesive tape or sheet has the configuration (2)], usually the light-shielding layer. Since the surface resistivity of the layer is not a problem, the size of the surface resistivity is not particularly limited, and may be 10 ¹² (Ω / □) or more, or less than 10 ¹² (Ω / □). Good.

Therefore, when the light-shielding layer is a printing layer (light-shielding printing layer), the light-shielding layer can be formed of an ink composition capable of exhibiting light shielding properties, and particularly has non-conductivity or low conductivity. In the case of a printing layer [that is, a printing layer having a surface resistivity of 10 ¹² (Ω / □) or more], it may be referred to as a non-conductive or low-conductive ink composition (referred to as “non-conductive ink composition”). A). Such a non-conductive ink composition is not particularly limited, and can form a layer having a surface resistivity of 10 ¹² (Ω / □) or more and can be transmitted through an adhesive tape or sheet. Any ink composition may be used as long as the rate can be 0.3 (%) or less.

In the present invention, as the light-shielding layer, a black layer exhibiting black is suitable. In the black layer, black and basically, L ^* a ^* b ^* L defined by the color system ^* is 35 or less (0 to 35) [preferably 30 or less (0 to 30), more preferably Means a black color of 25 or less (0 to 25)]. Note that a ^* and b ^* defined by the L ^* a ^* b ^* color system can be appropriately selected according to the value of L ^* . As a ^* and b ^* , for example, both are preferably in the range of −10 to 10 (particularly −5 to 5), and in particular, both are 0 or almost 0 (range of −2 to 2). It is preferable that

In the present invention, a color difference meter (trade name “CR-200” manufactured by Minolta Co .; color difference meter) is used for L ^* , a ^* , and b ^* defined in the L ^* a ^* b ^* color system. It is obtained by measuring. The L ^* a ^* b ^* color system is a color space recommended by the International Commission on Illumination (CIE) in 1976, and is a color space called the CIE 1976 (L ^* a ^* b ^* ) color system. It means that. The L ^* a ^* b ^* color system is defined in JIS Z 8729 in the Japanese Industrial Standard.

When such a black layer as the light-shielding layer has a characteristic that the surface resistivity is 10 ¹² (Ω / □) or more, for example, as a non-conductive ink composition, as a color material, non-conductive Alternatively, it may be formed using a non-conductive or low-conductive black ink composition mainly containing a low-conductive black color material, but the non-conductive ink composition is non-conductive or low-conductive. Cyan color material (blue-green color material), non-conductive or low-conductivity magenta color material (red-purple color material), and non-conductive or low-conductivity yellow color material (yellow-type) It is preferably formed using a non-conductive or low-conductive mixed ink composition (which may be referred to as a “non-conductive mixed ink composition”) mixed with a coloring material. Of course, as a black layer, when the surface resistivity does not need to have a characteristic of 10 ¹² (Ω / □) or more, an ink composition (as appropriate) selected from various color materials without considering conductivity. And a black ink composition or a mixed ink composition in which a cyan color material, a magenta color material, and a yellow color material are mixed).

  Each of these color materials may be any color material (colorant) such as a pigment or a dye, but a pigment can be preferably used.

In addition, when the black layer has a characteristic that the surface resistivity is 10 ¹² (Ω / □) or more, the non-conductive or low-conductivity mainly including a non-conductive or low-conductivity cyan coloring material. A layer made of a conductive cyan-based ink composition, a layer made of a non-conductive or low-conductive magenta-based ink composition mainly containing a non-conductive or low-conductive magenta color material, and a non-conductive or low-conductive layer A non-conductive or low-conductive yellow ink composition mainly containing a yellow color material may be used to form a multilayer structure. Of course, when the black layer does not need to have a characteristic that the surface resistivity is 10 ¹² (Ω / □) or more, the cyan color material is used regardless of the conductivity of the color material or the ink composition. It is composed of a multilayer structure of a layer mainly composed of a cyan ink composition, a layer composed of a magenta ink composition mainly including a magenta color material, and a layer composed of a yellow ink composition mainly including a yellow color material. Also good.

  In the non-conductive or low-conductive cyan color material (non-conductive cyan color material), examples of the pigment (non-conductive or low-conductive cyan color material) include C.I. I. Pigment blue 1, C.I. I. Pigment blue 2, C.I. I. Pigment blue 3, C.I. I. Pigment blue 15, C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 2, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, C.I. I. Pigment blue 15: 5, C.I. I. Pigment blue 15: 6, C.I. I. Pigment blue 16, C.I. I. Pigment blue 17, C.I. I. Pigment blue 17: 1, C.I. I. Pigment blue 18, C.I. I. Pigment blue 22, C.I. I. Pigment blue 25, C.I. I. Pigment blue 56, C.I. I. Pigment blue 60, C.I. I. Pigment blue 63, C.I. I. Pigment blue 65, C.I. I. Pigment blue 66, C.I. I. Bat Blue 4, C.I. I. Bat Blue 60, C.I. I. Among cyan pigments such as CI Pigment Green 7, non-conductive or low-conductive pigments can be appropriately selected and used. In the non-conductive cyan color material, examples of the dye (non-conductive or low-conductive cyan dye) include C.I. I. Solvent Blue 25, C.I. I. Solvent Blue 36, C.I. I. Solvent Blue 60, C.I. I. Solvent Blue 70, C.I. I. Solvent Blue 93, C.I. I. Solvent Blue 95, C.I. I. Acid Blue 6, C.I. I. Among cyan dyes such as Acid Blue 45, non-conductive or low-conductive ones can be appropriately selected and used.

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

  In the non-conductive magenta color material, examples of the dye (non-conductive or low-conductive magenta dye) include C.I. I. Solvent Red 1, C.I. I. Solvent Red 3, C.I. I. Solvent Red 8, C.I. I. Solvent Red 23, C.I. I. Solvent Red 24, C.I. I. Solvent Red 25, C.I. I. Solvent Red 27, C.I. I. Solvent Red 30, C.I. I. Solvent Red 49, C.I. I. Solvent Red 52, C.I. I. Solvent Red 58, C.I. I. Solvent Red 63, C.I. I. Solvent Red 81, C.I. I. Solvent Red 82, C.I. I. Solvent Red 83, C.I. I. Solvent Red 84, C.I. I. Solvent Red 100, C.I. I. Solvent Red 109, C.I. I. Solvent Red 111, C.I. I. Solvent Red 121, C.I. I. Solvent Red 122, C.I. I. Disper thread 9, C.I. I. Solvent Violet 8, C.I. I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 21, C.I. I. Solvent Violet 27, C.I. I. Disperse Violet 1, C.I. I. Basic Red 1, C.I. I. Basic Red 2, C.I. I. Basic Red 9, C.I. I. Basic Red 12, C.I. I. Basic Red 13, C.I. I. Basic Red 14, C.I. I. Basic Red 15, C.I. I. Basic Red 17, C.I. I. Basic Red 18, C.I. I. Basic Red 22, C.I. I. Basic Red 23, C.I. I. Basic Red 24, C.I. I. Basic Red 27, C.I. I. Basic Red 29, C.I. I. Basic Red 32, C.I. I. Basic Red 34, C.I. I. Basic Red 35, C.I. I. Basic Red 36, C.I. I. Basic Red 37, C.I. I. Basic Red 38, C.I. I. Basic Red 39, C.I. I. Basic Red 40, C.I. I. Basic Violet 1, C.I. I. Basic Violet 3, C.I. I. Basic Violet 7, C.I. I. Basic Violet 10, C.I. I. Basic Violet 14, C.I. I. Basic Violet 15, C.I. I. Basic Violet 21, C.I. I. Basic Violet 25, C.I. I. Basic Violet 26, C.I. I. Basic Violet 27, C.I. I. Non-conductive or low-conductive dyes can be appropriately selected from magenta dyes such as basic violet 28 and used.

  Furthermore, in a non-conductive or low-conductivity yellow color material (non-conductive yellow color material), examples of the pigment (non-conductive or low-conductivity yellow color material) include C.I. I. Pigment orange 31, C.I. I. Pigment orange 43, C.I. I. Pigment yellow 1, C.I. I. Pigment yellow 2, C.I. I. Pigment yellow 3, C.I. I. Pigment yellow 4, C.I. I. Pigment yellow 5, C.I. I. Pigment yellow 6, C.I. I. Pigment yellow 7, C.I. I. Pigment yellow 10, C.I. I. Pigment yellow 11, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 15, C.I. I. Pigment yellow 16, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 23, C.I. I. Pigment yellow 24, C.I. I. Pigment yellow 34, C.I. I. Pigment yellow 35, C.I. I. Pigment yellow 37, C.I. I. Pigment yellow 42, C.I. I. Pigment yellow 53, C.I. I. Pigment yellow 55, C.I. I. Pigment yellow 65, C.I. I. Pigment yellow 73, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 75, C.I. I. Pigment yellow 81, C.I. I. Pigment yellow 83, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 94, C.I. I. Pigment yellow 95, C.I. I. Pigment yellow 97, C.I. I. Pigment yellow 98, C.I. I. Pigment yellow 100, C.I. I. Pigment yellow 101, C.I. I. Pigment yellow 104, C.I. I. Pigment yellow 108, C.I. I. Pigment yellow 109, C.I. I. Pigment yellow 110, C.I. I. Pigment yellow 113, C.I. I. Pigment yellow 114, C.I. I. Pigment yellow 116, C.I. I. Pigment yellow 117, C.I. I. Pigment yellow 120, C.I. I. Pigment yellow 128, C.I. I. Pigment yellow 129, C.I. I. Pigment yellow 133, C.I. I. Pigment yellow 138, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 147, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 151, C.I. I. Pigment yellow 153, C.I. I. Pigment yellow 154, C.I. I. Pigment yellow 155, C.I. I. Pigment yellow 156, C.I. I. Pigment yellow 167, C.I. I. Pigment yellow 172, C.I. I. Pigment yellow 173, C.I. I. Pigment yellow 180, C.I. I. Pigment yellow 185, C.I. I. Pigment yellow 195, C.I. I. Bat Yellow 1, C.I. I. Bat Yellow 3, C.I. I. Non-conductive or low-conductive pigments can be appropriately selected from yellow pigments such as Vat Yellow 20 and used. In the non-conductive yellow color material, examples of the dye (non-conductive or low-conductive yellow dye) include C.I. I. Solvent Yellow 19, C.I. I. Solvent Yellow 44, C.I. I. Solvent Yellow 77, C.I. I. Solvent Yellow 79, C.I. I. Solvent Yellow 81, C.I. I. Solvent Yellow 82, C.I. I. Solvent Yellow 93, C.I. I. Solvent Yellow 98, C.I. I. Solvent Yellow 103, C.I. I. Solvent Yellow 104, C.I. I. Solvent Yellow 112, C.I. I. A non-conductive or low-conductive dye can be appropriately selected from yellow dyes such as Solvent Yellow 162 and used.

  In the non-conductive type mixed ink composition, the non-conductive type cyan color material, the non-conductive type magenta color material, and the non-conductive type yellow color material can be used alone or in combination of two or more.

The mixing ratio (or blending ratio) of the non-conductive cyan color material, non-conductive magenta color material and non-conductive yellow color material in the non-conductive type mixed ink composition is black color (for example, , L ^* a ^* b ^* L ^* defined in the color system, a ^* and b ^* are not particularly limited as long as they can exhibit a black color in the above range, depending on the type of each color material, etc. It can be selected appropriately. The content ratio of each color material of the non-conductive cyan color material, the non-conductive type magenta color material and the non-conductive type yellow color material in the non-conductive type mixed ink composition is, for example, relative to the total amount of the color material, Non-conductive type cyan color material / non-conductive type magenta color material / non-conductive type yellow color material = 10 to 50 (wt%) / 10 to 50 (wt%) / 10 to 50 (wt%) [preferably 20 to 40 (wt%) / 20 to 40 (wt%) / 20 to 40 (wt%)].

  Of course, when a cyan color material, a magenta color material, or a yellow color material is used regardless of conductivity, the cyan color material (cyan pigment, cyan dye), magenta color specifically exemplified above is used. Any material selected from materials (magenta pigments, magenta dyes) and yellow color materials (yellow pigments, yellow dyes) can be selected and used regardless of conductivity.

  As a black color material, when using a black color material regardless of conductivity, for example, 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 black pigment, anthraquinone Organic black pigments can be used. Black color materials can be used alone or in combination of two or more. In addition, as the non-conductive or low-conductive black color material, for example, a non-conductive or low-conductive color material selected from the black color materials specifically exemplified above is appropriately selected. Other known non-conductive or low-conductive black color materials can also be used.

  Ink compositions containing such various color materials (for example, non-conductive or low-conductive black ink compositions, non-conductive ink compositions such as non-conductive mixed ink compositions, etc.) In addition to the material, it contains a binder, a dispersant, a solvent and the like as required. The binder is not particularly limited, and for example, polyurethane resin, phenol resin, epoxy resin, urea melamine resin, silicone resin, phenoxy resin, methacrylic resin, acrylic resin, polyarylate resin, polyester 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, celluloses (cellulose cellulose) Resins, such as ethyl cellulose resin), known resin (thermoplastic resin such as polyacetal, etc. thermosetting resin or photo-curable resin). A binder can be used individually or in combination of 2 or more types.

  In the present invention, the light-shielding layer may have either a single layer or a multilayer form, but preferably has a multilayer form. Therefore, the pressure-sensitive adhesive tape or sheet preferably has a multilayered light-shielding layer (particularly, a multilayered black layer). Thus, the light-shielding property of the light-shielding layer can be further enhanced by providing the light-shielding layer with a multilayer structure. In addition, when the light-shielding layer has a multilayer form, the number of light-shielding layers may be 2 or more, and may be appropriately selected from a range of 2 to 10, for example. 3-8 (more preferably 4-6, especially 4).

  In addition, when the light-shielding layer has a multilayer form, not the transmittance of the light-shielding layer of each layer but the multilayer form so that the transmittance of the adhesive tape or sheet is 0.3 (%) or less. It is important to adjust the transmittance of the entire light-shielding layer.

  The thickness of the light shielding layer is not particularly limited. For example, when the light-shielding layer is a printing layer (light-shielding printing layer), the thickness of the light-shielding printing layer (when the light-shielding printing layer has a multilayer structure, the total thickness of the light-shielding printing layer) is 0. It can be selected from the range of 5 to 20 μm (preferably 3 to 15 μm, more preferably 5 to 10 μm). Moreover, when the light-shielding layer is a base material or an adhesive layer, the thickness of the light-shielding layer can be selected from the ranges of the thickness of the base material and the thickness of the adhesive layer exemplified below.

  In the present invention, the light-shielding layer may be a substrate (that is, a light-shielding substrate) or an adhesive layer (that is, a light-shielding adhesive layer). The printing layer (light-shielding printing layer) provided between the substrate and the pressure-sensitive adhesive layer is preferable. In addition, when the light-shielding layer has a multilayer form, a light-shielding substrate or a light-shielding pressure-sensitive adhesive layer may be included as a layer included in the multilayer light-shielding layer. Specifically, as the layer configuration of the light-shielding layer, for example, a layer configuration by one or two or more light-shielding printing layers, a light-shielding substrate, and one layer formed on the light-shielding substrate or Layer structure with two or more light-shielding print layers, layer structure with one or two or more light-shielding print layers and a light-shielding pressure-sensitive adhesive layer formed on the light-shielding print layer, light-shielding substrate A layer structure comprising one or two or more light-shielding print layers formed on the light-shielding substrate and a light-shielding pressure-sensitive adhesive layer formed on the light-shielding print layer, Examples of the layer structure include one or two or more light-shielding print layers formed on the light-shielding base material and a light-shielding base material formed on the light-shielding print layer.

  The method for forming the light-shielding layer is not particularly limited, and can be appropriately selected from known methods for forming the light-shielding layer depending on the type and layer configuration of the light-shielding layer. Specifically, the light-shielding layer is, for example, a light-shielding printing layer formed of a non-conductive ink composition (non-conductive mixed ink composition or the like) and provided between the substrate and the adhesive layer. In some cases, as a method for forming the light-shielding print layer, a non-conductive ink composition for forming the light-shielding print layer is applied on a predetermined surface and dried as necessary. Examples include a method using a printing method (gravure printing method, flexographic printing method, offset printing method, relief printing method, screen printing method, etc.).

(Reflective layer)
In the pressure-sensitive adhesive tape or sheet of the present invention, the reflectance of one surface is 60 (%) or more [for example, 60 to 100 (%), preferably 70 (%) or more, more preferably 80 (%) or more]. It may be. Accordingly, the pressure-sensitive adhesive tape or sheet may have a reflective layer for making the reflectance of one surface 60% or more. By providing the reflective layer, the reflectance of the surface of the pressure-sensitive adhesive tape or sheet on which the reflective layer is formed can be 60 (%) or more. As such a reflective layer, it is important to have a reflectance that can make the reflectance of the adhesive tape or sheet 60% or more. Therefore, as the reflectance of the reflective layer, it is important that the reflectance is 60 (%) or more [60 to 100 (%)], preferably 70 (%) or more, like the reflectance of the adhesive tape or sheet. [More preferably 80 (%) or more].

  Note that the reflectance (diffuse reflectance) (%) of a predetermined surface of the adhesive tape or sheet is determined by adhering light having a wavelength of 550 nm using a spectrophotometer (device name “MPS-2000”) manufactured by Shimadzu Corporation. It is calculated | required by irradiating from the one surface side (predetermined surface side) of a tape or a sheet | seat, and measuring the intensity | strength of the light reflected on the surface irradiated with the said light.

  Such a reflective layer may be any layer that exhibits reflectivity, and may be any layer such as a pressure-sensitive adhesive layer, a substrate, an ink layer (printing layer, etc.), for example. The reflective layer is formed in such a manner that the reflectance of one surface of the adhesive tape or sheet is 60% or more in order to reflect the light irradiated to one surface of the adhesive tape or sheet. For example, it may be formed in a form exposed on one surface of an adhesive tape or sheet, and a layer having transparency (for example, a transparent adhesive layer or a transparent substrate). You may form in the form located in an inner surface side. In any case, the reflective layer is preferably formed on the surface of the base material side with respect to the light-shielding layer.

  In the present invention, the reflective layer is preferably a printed layer. In addition, the printing layer (reflective printing layer) as a reflective layer can be formed with the ink composition which can exhibit reflectivity.

Examples of such a reflective layer include a white layer exhibiting a white color and a silver color layer exhibiting a silver color, but exhibit a white color from the viewpoint of non-conductivity or low conductivity. A white layer can be suitably used. In the white layer, the white and basically, L ^* a ^* b ^* L defined by the color system ^* is 87 or more (87 to 100) [preferably 90 or more (90 to 100), more preferably Means a white color of 92 or more (92-100)]. Note that a ^* and b ^* defined by the L ^* a ^* b ^* color system can be appropriately selected according to the value of L ^* . As a ^* and b ^* , for example, both are preferably in the range of −10 to 10 (particularly −5 to 5), and in particular, both are 0 or almost 0 (range of −2 to 2). It is preferable that

The silver color basically means a silver color in which L ^* defined by the L ^* a ^* b ^* color system is 70 to 90 (preferably 72 to 88, more preferably 75 to 85). Means. Note that a ^* and b ^* defined by the L ^* a ^* b ^* color system can be appropriately selected according to the value of L ^* . As a ^* and b ^* , for example, both are preferably in the range of −10 to 10 (particularly −5 to 5), and in particular, both are 0 or almost 0 (range of −2 to 2). It is preferable that

  Such a reflective layer such as a white layer is 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. Can do. The white color material and the silver color material may be any color material (colorant) such as a pigment or a dye, but a pigment can be preferably used. 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, and oxidation. Tin, barium oxide, cesium oxide, yttrium oxide, magnesium carbonate, calcium carbonate (light 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 white, zinc sulfide, talc, silica, alumina, clay, kaolin, titanium phosphate, mica, gypsum, white carbon, diatomaceous earth, bentona Inorganic white color materials such as Toto, lithopone, zeolite, sericite, hydrous halloysite, acrylic resin particles, polystyrene resin particles, polyurethane resin particles, amide resin particles, polycarbonate resin particles, silicone resin particles, Examples thereof include organic white color materials such as urea-formalin resin particles and melamine resin particles. A fluorescent whitening agent can be used as the white colorant, and the fluorescent whitening agent can be appropriately selected from known fluorescent whitening agents. A white color material can be used individually or in combination of 2 or more types.

  As the white color material, when the reflective layer is a non-conductive or low-conductive reflective layer, it is important to use a non-conductive or low-conductive white color material. As the non-conductive or low-conductive white color material, a non-conductive or low-conductive color material can be appropriately selected from the above-described white color materials, and titanium oxide is particularly preferably used. Can do.

  Examples of the silver color material include silver and aluminum. Silver-based color materials can be used alone or in combination of two or more.

  The ink composition (white ink composition or the like) for forming the reflective layer contains a binder, a dispersant, a solvent, and the like as necessary in addition to the color material. Examples of the binder include binders exemplified as the binder contained in the non-conductive ink composition in the section of the light-shielding layer.

  The reflective layer may have either a single layer or a multilayer form, but preferably has a multilayer form from the viewpoint of further improving the reflectivity. Therefore, the pressure-sensitive adhesive tape or sheet preferably has a reflective layer having a multilayer structure (particularly, a white layer having a multilayer structure). In addition, when the reflective layer has a multilayer form, the number of layers of the reflective layer may be 2 or more, and may be appropriately selected from a range of 2 to 10, for example. 2-6 (more preferably 2-4, especially 2).

  In addition, when the reflective layer has a multilayer form, the reflectance of the multilayer form is used instead of the reflectance of the reflective layer of each layer so that the reflectance of the adhesive tape or sheet is 60% or more. It is important to adjust the reflectivity of the entire conductive layer.

  The thickness of the reflective layer (when the reflective layer has a multilayer structure, the thickness of the entire reflective layer having a multilayer structure) is not particularly limited, and is, for example, in the range of 5 to 150 μm (preferably 10 to 100 μm). Can be appropriately selected.

  In the present invention, the reflective layer may be a substrate (that is, a reflective substrate) or an adhesive layer (that is, a reflective adhesive layer), but in particular, a layer provided on the substrate [particularly And a printing layer (reflective printing layer) provided between the base material and the light-shielding layer. In addition, when a reflective layer has a multilayer form, a reflective base material and a reflective adhesive layer may be contained as a layer contained in the reflective layer of a multilayer form. Specifically, as the layer configuration of the reflective layer, for example, a layer configuration by one or two or more reflective printing layers, a reflective base material, and a single layer formed on the reflective base material or Layer configuration with two or more reflective printing layers, Layer configuration with one or two or more reflective printing layers, and a reflective adhesive layer formed on the reflective printing layer, reflective substrate And a layer configuration of one or two or more reflective printing layers formed on the reflective substrate and a reflective adhesive layer formed on the reflective printing layer.

  The method for forming the reflective layer is not particularly limited, and can be appropriately selected from known methods for forming the reflective layer according to the type and layer configuration of the reflective layer. Specifically, for example, when the reflective layer is a reflective print layer formed of an ink composition and provided on a substrate, the reflective print layer is formed as a method for forming the reflective print layer. A method of applying an ink composition to the substrate on the substrate and performing drying or the like as necessary, and various printing methods (gravure printing method, flexographic printing method, offset printing method, letterpress printing method, screen printing method, etc. ) And other methods. In addition, when the reflective layer is a reflective base material formed of a plastic material, a plastic composition for forming the reflective base material is used, and a molding method such as extrusion molding, inflation molding or calendar molding is used. And a method of forming it into a sheet. Of course, in the case where the reflective layer is a reflective layer having a multilayer structure including a reflective substrate, the reflective layer having a multilayer structure can be formed by utilizing a method combining the above methods.

  In the reflective layer, the silver layer can also be formed by using a vapor deposition method using a metal component capable of exhibiting a silver color such as silver or aluminum. As a vapor deposition method, a reduced pressure vapor deposition method (vacuum vapor deposition method), a physical sputtering method, a chemical sputtering method, or the like can be employed.

(Other layers)
The pressure-sensitive adhesive tape or sheet of the present invention may further have other layers. When the adhesive tape or sheet has, for example, a black layer as a light-shielding layer and a white layer as a reflective layer, for example, a color other than black and white between the black layer and the white layer (In particular, the light-shielding property and the light-reflective property can be adjusted by changing step by step from one side to the other side). Good. In this way, as another layer, a reflective light shielding adjustment layer is provided between the light shielding layer and the reflective layer (that is, the reflective layer, the reflective light shielding adjustment layer, and the light shielding layer are formed in this order). Thus, the pressure-sensitive adhesive tape or sheet can be exhibited stepwise from the light-shielding layer side to the reflective layer side with respect to the light-shielding property, and the reflectivity from the reflective layer side to the light-shielding layer side.

  In the layer exhibiting a color other than black and white, the color other than black and white may be any color as long as it is a color other than black and white. For example, red, blue, yellow, green, Examples include yellowish green, orange, purple, gray, gold, and silver. In addition, as a reflection light-shielding adjustment layer, the silver layer which exhibits silver, and the gray layer which exhibits gray are preferable.

(Base material)
The base material in the pressure-sensitive adhesive tape or sheet may be any base material such as a plastic base material, a metal base material, or a fiber base material, but it is non-conductive or low in terms of conductivity or thinness. Therefore, a plastic base material can be suitably used. Examples of the material or material of the plastic base material include polyester (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, etc.), polyolefin (polyethylene, polypropylene, ethylene-propylene copolymer, etc.), and polyvinyl alcohol. , Polyvinylidene chloride, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyamide, polyimide, cellulose, fluororesin, polyether, polystyrene resin (polystyrene, etc.), polycarbonate, polyethersulfone, etc. Is mentioned. These materials can be used alone or in combination of two or more.

  The substrate may have any form of a single layer or a multilayer.

  In addition, when the base material is a black layer as a light-shielding layer (light-shielding base material) or a white layer as a reflective layer (reflective base material), a color material (black system) corresponding to the presenting color A coloring material, a white coloring material, etc.) may be contained.

  In addition, when the base material is not a black layer as a light-shielding layer (light-shielding base material) or a white layer as a reflective layer (reflective base material), a base material having transparency (“transparent base material”) May be suitably used.

  In the base material, known additives such as a filler, a flame retardant, an anti-aging agent, an antistatic agent, a softening agent, an ultraviolet absorber, an antioxidant, a plasticizer, and a surfactant may be used as necessary. In the case of using a non-conductive or low-conductive base material (non-conductive type base material) as a base material, a non-conductive or low-conductive additive is used as an additive. This is very important.

  The thickness of the substrate is not particularly limited and can be appropriately selected from a range of 10 to 200 μm (preferably 15 to 130 μm), for example.

  The method for forming the base material is not particularly limited. For example, when the base material is a plastic base material, molding such as extrusion molding, inflation molding, calendar molding, etc., using a resin composition constituting the plastic base material. Examples thereof include a method of forming into a sheet shape using the method.

(Adhesive layer)
The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer in the pressure-sensitive adhesive tape or sheet is not particularly limited. For example, urethane pressure-sensitive adhesive, acrylic pressure-sensitive adhesive, rubber pressure-sensitive adhesive, silicone pressure-sensitive adhesive, polyester-based pressure-sensitive adhesive, Known pressure-sensitive adhesives such as polyamide-based pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, and fluorine-based pressure-sensitive adhesives can be used. An adhesive can be used individually or in combination of 2 or more types. The pressure-sensitive adhesive may be any pressure-sensitive adhesive, and examples thereof include an emulsion-type pressure-sensitive adhesive, a solvent-type pressure-sensitive adhesive, and a hot-melt-type pressure-sensitive adhesive (hot-melt-type pressure-sensitive adhesive). .

  As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive or a rubber-based pressure-sensitive adhesive can be suitably used. The acrylic pressure-sensitive adhesive contains an acrylic polymer as a main component or a base polymer. The acrylic polymer is not particularly limited, but (meth) acrylic acid alkyl ester (acrylic acid alkyl ester, methacrylic acid alkyl ester) is used as the main constituent monomer component (monomer main component). preferable. Specifically, as the (meth) acrylic acid alkyl ester, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, (meth) acrylic acid Butyl, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isoamyl (meth) acrylate, neopentyl (meth) acrylate, (meta ) Hexyl acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, ( (Meth) acrylic acid decyl, (meth) acrylic acid isodecyl, (meth) acrylic acid Ndeshiru, like (meth) dodecyl acrylate. The (meth) acrylic acid alkyl ester can be used alone or in combination of two or more.

  As the monomer component constituting the acrylic polymer, other monomer components that can be copolymerized with (meth) acrylic acid alkyl ester (“copolymerizable monomer”) can be used as long as (meth) acrylic acid alkyl ester is the main monomer component. May be referred to as “components”). In addition, as (meth) acrylic-acid alkylester, it is preferable to use in the ratio of 50 (weight%) or more with respect to the monomer component whole quantity which comprises an acryl-type polymer. When the ratio of the (meth) acrylic acid alkyl ester is less than 50 (% by weight) based on the total amount of monomer components constituting the acrylic polymer, the characteristics (such as adhesiveness) of the acrylic polymer are difficult to be exhibited. There is a case.

  As the copolymerizable monomer component, it can be used for introducing a crosslinking point into the acrylic polymer or for increasing the cohesive force of the acrylic polymer. The copolymerizable monomer components can be used alone or in combination of two or more.

  Specifically, as the copolymerizable monomer component, a functional group-containing monomer component (particularly, heat for introducing a crosslinking point that is thermally crosslinked to the acrylic polymer) is introduced in order to introduce a crosslinking point into the acrylic polymer. Crosslinkable functional group-containing monomer component) can be used. Such a functional group-containing monomer component is not particularly limited as long as it is a monomer component that can be copolymerized with a (meth) acrylic acid alkyl ester and has a functional group that becomes a crosslinking point. (Meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, isocrotonic acid and other carboxyl group-containing monomers or acid anhydrides thereof (maleic anhydride, itaconic anhydride, etc.); (meth) acrylic acid 2-hydroxy Hydroxyalkyl (meth) acrylates such as ethyl, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, etc., and hydroxyl-containing monomers such as vinyl alcohol and allyl alcohol; (meth) acrylamide, N , N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, -Amide monomers such as methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide; aminoethyl (meth) acrylate, (meth) Amino group-containing monomers such as N, N-dimethylaminoethyl acrylate and t-butylaminoethyl (meth) acrylate; Epoxy group-containing monomers such as glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate; acrylonitrile; Cyano-containing monomers such as methacrylonitrile; N-vinyl-2-pyrrolidone, N-methylvinylpyrrolidone, N-vinylpyridine, N-vinylpiperidone, N-vinylpyrimidine, N-vinylpiperazine, N-vinylpyrazine, N-vinyl Roll, N- vinylimidazole, N- vinyloxazole, N- vinyl morpholine, N- vinyl caprolactam, such a monomer having a nitrogen atom-containing ring such as 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.

  Further, as the copolymerizable monomer component, other copolymerizable monomer components can be used in order to increase the cohesive strength of the acrylic polymer. Other copolymerizable monomer components include, for example, vinyl ester monomers such as vinyl acetate and vinyl propionate; styrene monomers such as styrene, substituted styrene (α-methylstyrene, etc.) and vinyltoluene; (meth) acrylic acid Non-aromatic ring-containing (meth) acrylic esters such as cycloalkyl esters [cyclohexyl (meth) acrylate, cyclopentyl di (meth) acrylate, etc.], bornyl (meth) acrylate, isobornyl (meth) acrylate; (Meth) acrylic acid aryl ester [(meth) acrylic acid phenyl etc.], (meth) acrylic acid aryloxyalkyl ester [(meth) acrylic acid phenoxyethyl etc.] and (meth) acrylic acid arylalkyl ester [(meth) acrylic Acid benzyl ester] Any aromatic ring-containing (meth) acrylic acid ester; olefinic monomers such as ethylene, propylene, isoprene, butadiene, isobutylene; vinyl chloride, vinylidene chloride; isocyanate group-containing monomers such as 2- (meth) acryloyloxyethyl isocyanate; Alkoxy group-containing monomers such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate; 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, neopentyl glycol 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, urethane acrylate, divinylbenzene, butyl di (meth) acrylate, hexyl di (meth) acrylate, etc. And other polyfunctional monomers.

  Rubber adhesives include natural rubber, styrene-isoprene-styrene block copolymer (SIS block copolymer), styrene-butadiene-styrene block copolymer (SBS block copolymer), styrene-ethylene / butylene- Based on rubber components such as styrene block copolymer (SEBS block copolymer), styrene-butadiene rubber, polybutadiene, polyisoprene, polyisobutylene, butyl rubber, chloroprene rubber, silicone rubber, acrylonitrile-butadiene rubber, ethylene-propylene terpolymer Examples thereof include a rubber-based pressure-sensitive adhesive as a polymer.

  In the pressure-sensitive adhesive, if necessary, for example, a crosslinking agent, a cross-linking agent, a tackifier resin, a filler, a flame retardant, an anti-aging agent, an antistatic agent, a softening agent, an ultraviolet absorber, an antioxidant. In the case of using a non-conductive or low-conductive pressure-sensitive adhesive layer (non-conductive pressure-sensitive adhesive layer) as a pressure-sensitive adhesive layer, a known additive such as a plasticizer or a surfactant may be included. It is important to use a non-conductive or low-conductive additive as the additive.

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

  In addition, when the pressure-sensitive adhesive layer is a black layer as a light-shielding layer (light-shielding pressure-sensitive adhesive layer) or a white layer as a reflective layer (reflective pressure-sensitive adhesive layer), a color material corresponding to the presenting color (A black color material, a white color material, etc.) may be contained.

  The pressure-sensitive adhesive layer is not a black layer as a light-shielding layer (light-shielding pressure-sensitive adhesive layer) or a white layer as a reflective layer (reflective pressure-sensitive adhesive layer). In some cases, it may be referred to as “adhesive layer”.

  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 method of forming the pressure-sensitive adhesive layer is not particularly limited. For example, a method of applying a pressure-sensitive adhesive on a predetermined surface and drying or curing as necessary, or a method of applying a pressure-sensitive adhesive on a separator (release liner). Then, after drying or curing as necessary, a pressure-sensitive adhesive layer is formed, and then the pressure-sensitive adhesive layer is bonded onto a predetermined surface and transferred. In applying the pressure-sensitive adhesive, a conventional coating machine (for example, gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray coater, etc.) can be used.

As described above, the pressure-sensitive adhesive tape or sheet of the present invention has a base material and a pressure-sensitive adhesive layer formed on at least one surface of the base material, and has a transmittance of 0.3 (%) or less. Further, if necessary, at least one of the surfaces having a configuration in which the reflectance of one surface is 60 (%) or more and the reflectance is less than 60 (%). The resistivity on the side is 10 ¹² (Ω / □) or more. Therefore, the adhesive tape or sheet specifically includes, for example, the following layer configurations (A1) to (A7), (B1) to (B8), (C1) to (C5), and (D1) to (D9). And a pressure-sensitive adhesive tape having a configuration in which the resistivity of at least one of the surfaces having a reflectance of less than 60% is 10 ¹² (Ω / □) or more A sheet etc. are mentioned.
Layer structure (A1): Transparent base material / 1 layer or two or more light-shielding layers / transparent pressure-sensitive adhesive layer layer structure (A2): Light-shielding base material / 1 layer or two or more light-shielding layers / Layer constitution of transparent adhesive layer Layer constitution (A3): Transparent base material / 1 layer or two or more light shielding layers / layer constitution of light shielding adhesive layer Layer constitution (A4): Light shielding base material / 1 layer or Layer constitution of two or more light-shielding layers / light-shielding pressure-sensitive adhesive layer Layer constitution (A5): Layer constitution of one layer or two or more light-shielding layers / transparent substrate / transparent pressure-sensitive adhesive layer Layer constitution (A6): Layer structure of one or two or more light-shielding layers / light-shielding base materials / transparent pressure-sensitive adhesive layers Layer constitution (A7): Substrates in layer constitutions (A1) to (A4) (transparent base materials or light-shielding base materials) ) Surface (exposed surface), or the surface of the light-shielding layer (exposed surface) in the layer structures (A5) to (A6), the transparent adhesive layer or Layer constitution in which a light-sensitive adhesive layer is formed Layer constitution (B1): Layer constitution of transparent substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers / transparent adhesive layer Layer constitution (B2): Reflective substrate / one or two or more reflective layers / one layer or two or more light-shielding layers / transparent adhesive layer constitution Layer constitution (B3): reflective substrate / Layer configuration of 1 layer or 2 or more light-shielding layers / transparent pressure-sensitive adhesive layer Layer structure (B4): 1 layer or 2 or more reflective layers / Transparent substrate / 1 layer or 2 or more light-shielding layers / Layer constitution of transparent adhesive layer Layer constitution (B5): one layer or two or more reflective layers / light-shielding substrate / one layer or two or more light-shielding layers / layer constitution of transparent adhesive layer Layer constitution (B6): Layer configuration of one or two or more reflective layers / reflective substrate / one layer or two or more light-shielding layers / transparent adhesive layer Layer configuration (B7): Layer configuration (B1) to (B3 The surface (exposed surface) of the substrate (transparent substrate or reflective substrate) or the surface of the reflective layer (exposed surface) in the layer configurations (B4) to (B6) Layer configuration in which a transparent pressure-sensitive adhesive layer or a reflective pressure-sensitive adhesive layer is formed Layer configuration (B8): Transparent pressure-sensitive adhesive layer in the layer configurations (B1) to (B6), or on the light-shielding layer in the layer configuration (B7) Layer structure in which the transparent adhesive layer on the side formed in the above is a light-shielding pressure-sensitive adhesive layer Layer structure (C1): Transparent substrate / 1 layer or two or more light-shielding layers / transparent substrate / transparent adhesive Layer configuration (C2): Light-shielding substrate / 1 layer or two or more light-shielding layers / Transparent substrate / Transparent adhesive layer configuration Layer configuration (C3): Light-shielding substrate / 1 Layer structure of layer or two or more light-shielding layers / light-shielding substrate / transparent adhesive layer Layer structure (C4): Light-shielding substrate / one layer or two layers or more Layer structure of upper light-shielding layer / light-shielding base material / light-shielding pressure-sensitive adhesive layer Layer structure (C5): Surface of substrate (transparent substrate or light-shielding base material) in layer structures (C1) to (C4) ( Layer structure in which a transparent pressure-sensitive adhesive layer or a light-shielding pressure-sensitive adhesive layer is formed on the exposed surface) Layer structure (D1): Transparent substrate / 1 layer or two or more reflective layers / 1 layer or Layer structure of two or more light-shielding layers / transparent substrate / transparent adhesive layer Layer structure (D2): Transparent substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers Layer structure (D3): transparent substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers / light-shielding substrate / Layer structure of light-shielding pressure-sensitive adhesive layer Layer structure (D4): The transparent substrate on the side formed on the reflective layer in the layer structures (D1) to (D3) is a reflective substrate. Configuration Layer configuration (D5): Layer configuration of one layer or two or more reflective layers / transparent substrate / one layer or two or more light-shielding layers / transparent substrate / transparent adhesive layer Layer configuration (D6): Layer configuration of one or two or more reflective layers / transparent substrate / one or two or more light-shielding layers / light-shielding substrate / transparent adhesive layer Layer structure (D7): one layer or two or more layers Layer structure of reflective layer / transparent substrate / one or two or more light-shielding layers / light-shielding substrate / light-shielding pressure-sensitive adhesive layer Layer constitution (D8): Reflection in layer constitutions (D5) to (D6) Layer configuration in which the transparent substrate on the side formed between the light-shielding layer and the light-shielding layer is a reflective substrate Layer configuration (D9): Base material in layer configurations (D1) to (D4) (transparent Layer structure in which a transparent adhesive layer or a reflective adhesive layer is formed on the surface (exposed surface) of the substrate or reflective substrate

  Thus, the pressure-sensitive adhesive tape or sheet may have a configuration in which the pressure-sensitive adhesive layer is formed only on one side of the base material, and has a configuration in which the pressure-sensitive adhesive layer is formed on both sides of the base material. Also good. Moreover, the 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 the pressure-sensitive 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 (release liner). Further, when the pressure-sensitive adhesive tape or sheet has a configuration in which the pressure-sensitive adhesive layer is formed only on one side of the base material, for example, a known release treatment agent (silicone-type release treatment) is formed on the surface (back side) of the base material. The surface of the pressure-sensitive adhesive layer may be protected by forming a release treatment layer made of an agent or the like and winding it into a roll in a form in which the release treatment layer and the pressure-sensitive adhesive layer are in contact with each other.

  Since the adhesive tape or sheet of the present invention has a transmittance of 0.3 (%) or less, it can be suitably used as an adhesive tape or sheet having a light shielding property (light shielding adhesive tape or sheet). When the transmittance is 0.3 (%) or less and the reflectance of one surface is 60% or more, it is suitably used as a pressure-sensitive adhesive tape or sheet (reflective light-shielding pressure-sensitive adhesive tape or sheet) having reflectivity and light shielding properties. Can be used.

  Therefore, the pressure-sensitive adhesive tape or sheet of the present invention is a liquid crystal display module unit in a liquid crystal display device (LCD) (particularly a small liquid crystal display device) used in a so-called “mobile phone” or a so-called “PDA”. It is useful as a light-shielding pressure-sensitive adhesive tape or sheet used for fixing to a backlight unit (particularly when the reflectance of one surface is 60% or more).

In addition, the liquid crystal display device of the present invention includes a liquid crystal display module unit and a backlight unit, and the liquid crystal display module unit and the backlight unit include the adhesive tape or sheet [that is, at least the base material. It has a pressure-sensitive adhesive layer on one surface, and the transmittance is 0.3 (%) or less, and the reflectance of at least one surface is less than 60 (%), and the reflectance Is fixed by an adhesive tape or sheet having a resistivity of 10 ¹² (Ω / □) or more on at least one of the surfaces of which the ratio is less than 60%. When the adhesive tape or sheet has a reflectance of one surface of less than 60 (%) and the reflectance of the other surface is 60 (%) or more, the reflectance is less than 60 (%). The surface on the liquid crystal display module unit side is located on the liquid crystal display module unit side, and the surface on the side on which the reflectance is 60% or more may be located on the backlight unit side. The surface on the side that is less than that may be located on the backlight unit side, and the surface on the side that has a reflectance of 60% or more may be located on the liquid crystal display module unit side.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In the examples, resistivity (Ω), transmittance (%), reflectance (%), and L ^* , a ^* , and b ^* defined in the L ^* a ^* b ^* color system are respectively It calculated | required with the following measuring methods.

(Measurement method of resistivity)
Using an insulation resistance tester (model number “3154”, measurement probe: “9185 measurement probe”) manufactured by Hioki Electric Co., Ltd., under conditions of room temperature (20 to 25 ° C.), voltage: 100 V, distance between electrodes: 100 mm Under such conditions, the tip of the electrode penetrates the pressure-sensitive adhesive layer on the black layer (four black layers) side, and with a force that hits the black layer or base material provided in contact with the pressure-sensitive adhesive layer, After pressing the tip of the electrode against the surface of the adhesive layer on the black layer or substrate side of the adhesive tape or sheet, the tip of the electrode is at least in contact with the black layer or substrate, and left to stand for 60 seconds. Read (resistance value) and calculate the resistivity (Ω / □).

(Measurement method of transmittance)
Using a spectrophotometer manufactured by Hitachi, Ltd. (device name “U4100 type spectrophotometer”), light having a wavelength of 550 nm was irradiated from one side of the adhesive tape or sheet and transmitted to the other side. The transmittance (%) is obtained by measuring the intensity of the film.

(Measurement method of reflectance)
Using a spectrophotometer (device name “MPS-2000”) manufactured by Shimadzu Corporation, light having a wavelength of 550 nm is applied to the surface of the white base material (Examples 1 and 2 or Comparative Example 2) in the adhesive tape or sheet. The reflectance (%) is obtained by measuring the intensity of the light irradiated and reflected by the surface irradiated with the light.

(Measurement method of L ^* , a ^* , b ^* )
Using a color difference meter (device name “CR-200”) manufactured by Minolta, L ^* , a ^* , b ^* defined by the L ^* a ^* b ^* color system is measured.

Example 1
The trade name “White PET ^# 38ZE type” (manufactured by Nakamoto Pax Co., Ltd.) was used as the substrate. The trade name “White PET ^# 38ZE type” (manufactured by Nakamoto Pax Co., Ltd.) is a white system containing titanium oxide as a white color material on one surface of a white substrate (polyethylene terephthalate film) having a thickness of 38 μm. A white layer (thickness: 2 μm) having a single-layer form is formed by performing a single printing using the gravure printing method (single layer coating) using the ink composition. On the layer, a mixed ink composition containing a cyan color material, a magenta color material and a yellow color material is used, and printing is performed four times by using a gravure printing method (4 layers are applied). It has a configuration in which a black layer having the form of a layer (total thickness of the black layer: 7 μm) is formed (that is, a white base material / white layer / 4 layers of black layers). .

After applying an acrylic pressure-sensitive adhesive on the black layer of the trade name “White PET ^# 38ZE type” (manufactured by Nakamoto Pax Co., Ltd.) and drying to form a transparent pressure-sensitive adhesive layer having a thickness of 20 μm, On the pressure-sensitive adhesive layer, a separator having a structure in which one surface is subjected to a release treatment with a silicone-based release treatment agent is overlaid, and further, on the exposed surface of the white substrate, After applying the same acrylic pressure-sensitive adhesive and drying to form a transparent pressure-sensitive adhesive layer having a thickness of 20 μm, one side of the pressure-sensitive adhesive layer was subjected to a release treatment with a silicone-type release treatment agent. The double-sided pressure-sensitive adhesive tape or sheet having a layer structure of transparent pressure-sensitive adhesive layer / white substrate / white layer / 4 black layers / transparent pressure-sensitive adhesive layer was obtained by superimposing the separators having the above-described configuration.

The surface resistivity of the double-sided pressure-sensitive adhesive tape or sheet on the black layer side was measured by the above-mentioned (Method of surface resistivity) and found to be 5 × 10 ¹² (Ω / □). Moreover, it was 0.03% when the transmittance | permeability of the double-sided adhesive tape or sheet | seat was measured by the said (measuring method of the transmittance | permeability). Further, the surface of the double-sided pressure-sensitive adhesive tape or sheet on the black layer side is determined by the above-described (L ^* , a ^* , b ^* measuring method) L ^* , a ^* defined by the L ^* a ^* b ^* color system ^. , B ^* was measured, L ^* was 24, a ^* was 0.23, and b ^* was 0.80.

Therefore, in the double-sided pressure-sensitive adhesive tape or sheet according to Example 1, the resistivity (surface resistivity) on the black layer side surface (surface having a reflectance of less than 60%) is 1 × 10 ¹² (Ω / □). ) The above, the surface on the black layer side or the black layer has non-conductivity or low conductivity.

Furthermore, when the reflectance of the surface of the double-sided pressure-sensitive adhesive tape or sheet on the white substrate side was measured by the above-described (Measurement method of reflectance), it was 85%. Moreover, when L ^* , a ^* , b ^* prescribed | regulated by L ^* a ^* b ^* color system about the surface of the white base material side of a double-sided adhesive tape or a sheet | seat was measured like the above, L ^* Was 92.7, a ^* was -0.6, and b ^* was -0.9.

In addition, in the double-sided pressure-sensitive adhesive tape or sheet according to Example 1, the resistivity (surface resistivity) on the white substrate side surface (surface having a reflectance of 60% or more) is also 1 × 10 ¹² (Ω). / □) or more, and the white substrate side surface is non-conductive or low-conductive.

(Example 2)
A transparent polyethylene terephthalate film was laminated on the black layer of the product name “White PET ^# 38ZE type” (manufactured by Nakamoto Packs Co., Ltd.) similar to Example 1, and a white substrate / white layer / 4 layers were formed. A base material having a layer structure of black layer / transparent base material is prepared, and the same acrylic pressure-sensitive adhesive as in Example 1 is applied on the transparent base material, dried, and transparent with a thickness of 20 μm. After forming a pressure-sensitive adhesive layer, a separator having a structure in which one side is subjected to a release treatment with a silicone-type release treatment agent is overlaid on the pressure-sensitive adhesive layer, and further, a white substrate On the exposed surface, the same acrylic pressure-sensitive adhesive as described above was applied and dried to form a transparent pressure-sensitive adhesive layer having a thickness of 20 μm. Then, one surface of the pressure-sensitive adhesive layer was silicone. It has a configuration that has been subjected to a release treatment with a system release treatment agent. By superimposing separator, to obtain a double-sided pressure-sensitive adhesive tape or sheet having a layer structure of transparent pressure-sensitive adhesive layer / white-colored base material / white layer / 4 layer of black layer / transparent base material / transparent pressure-sensitive adhesive layer.

About the double-sided adhesive tape or sheet | seat which concerns on Example 2, when the surface resistivity of the surface side by the side of a black layer is measured like Example 1, it is 5 * 10 < ¹³ > (ohm / square) and the transmittance | permeability is When measured in the same manner as in Example 1, it was 0.03%. Moreover, when L ^* , a ^* , b ^* prescribed | regulated by L ^* a ^* b ^* color system about the surface of the black layer side of a double-sided adhesive tape or a sheet | seat was measured like Example 1, L ^* Was 24, a ^* was 0.23, and b ^* was 0.80.

Therefore, in the double-sided pressure-sensitive adhesive tape or sheet according to Example 2, the resistivity (surface resistivity) on the black layer side surface (surface with a reflectance of less than 60%) is 1 × 10 ¹² (Ω / □). The surface on the black layer side is non-conductive or low-conductive.

Further, the reflectance of the surface of the double-sided pressure-sensitive adhesive tape or sheet on the white base material side was measured in the same manner as in Example 1, and was 85%. for surface, L ^* defined in L ^* a ^* b ^* color system, a ^*, and b ^*, was measured in the same manner as the, L ^* is 92.7, a ^* -0. 6 and b ^* was −0.9.

In addition, in the double-sided pressure-sensitive adhesive tape or sheet according to Example 2, the resistivity (surface resistivity) on the white substrate side surface (surface having a reflectance of 60% or more) is also 1 × 10 ¹² (Ω). / □) or more, and the white substrate side surface is non-conductive or low-conductive.

(Comparative Example 1)
On one surface of a white substrate (polyethylene terephthalate film) having a thickness of 38 μm, printing is performed once using a gravure printing method using a white ink composition containing titanium oxide as a white color material ( A white layer (thickness: 2 μm) having a single layer form is formed by applying a single layer, and a black ink composition (trade name) containing carbon black as a black color material on the white layer. Using “NB-300” (manufactured by Dainichi Seika Kogyo Co., Ltd.), printing is performed four times using the gravure printing method (coating with four layers), whereby a black layer having a four-layer configuration (black) A substrate ("carbon black layer-containing substrate") having a configuration in which a total thickness of the layer: 7 μm is formed (that is, a white substrate / a white layer / 4 layers of a black layer) May be referred to).

Transparent adhesive layer / white in the same manner as in Example 1 except that the carbon black layer-containing base material was used instead of the trade name “White PET ^# 38ZE type” (manufactured by Nakamoto Pax Corporation). A double-sided pressure-sensitive adhesive tape or sheet having a layer structure of: base material / white layer / 4 black layers / transparent pressure-sensitive adhesive layer was obtained.

When the surface resistivity of the double-sided pressure-sensitive adhesive tape or sheet on the black layer side was measured in the same manner as in Example 1, it was 5 × 10 ⁷ (Ω / □). Further, the transmittance of the double-sided pressure-sensitive adhesive tape or sheet was measured in the same manner as in Example 1, and found to be 0.03%. Furthermore, L ^* , a ^* , b ^* defined by the L ^* a ^* b ^* color system was measured in the same manner as in Example 1 for the surface of the double-sided pressure-sensitive adhesive tape or sheet on the black layer side. ^* Was 28.7, a ^* was 0.55, and b ^* was 1.77.

Therefore, in the double-sided pressure-sensitive adhesive tape or sheet according to Comparative Example 1, the black layer is formed of a black ink composition in which carbon black is used as the black color material, and the black layer side surface (reflectance is less than 60%). The surface side resistivity (surface resistivity) is 5 × 10 ⁷ (Ω / □) [less than 1 × 10 ¹² (Ω / □)], and the black layer side surface or black layer Does not have non-conductivity or low conductivity, but has conductivity.

Claims (11)

The transmittance is 0.3 (%) or less, the reflectance of at least one surface is less than 60 (%),
The resistivity defined below on at least one surface side of the surfaces where the reflectance is less than 60 (%) is 10 ¹² (Ω / □) or more,
The following layer configurations (A1 ′), (A2 ′), (A3), (A4), (A5), (A6), (A7), (B1 ′), (B1 ″), (B2), ( B3), (B4), (B5), (B6), (B7), or (B8)
The light-shielding layer having the layer configuration is a light-shielding layer for making the transmittance of the adhesive tape or sheet 0.3 (%) or less,
Among the surfaces where the reflectance is less than 60 (%), at least the resistivity on the surface side where the light-shielding layer is provided as the outermost layer or in contact with the pressure-sensitive adhesive layer is 10 ¹² (Ω / □). ) An adhesive tape or sheet that is above.
Layer constitution (A1 ′): Transparent adhesive layer on the surface (exposed surface) of the transparent substrate in the layer constitution of transparent substrate / 1 layer or two or more light-shielding layers / transparent adhesive layer Or a layer structure with a light-shielding adhesive layer
Layer structure (A2 ′): Transparent adhesive on the surface (exposed surface) of the light-shielding substrate in the layer structure of light-shielding substrate / one layer or two or more light-shielding layers / transparent adhesive layer Layer constitution layer configuration (A3) in which an agent layer or a light-shielding pressure-sensitive adhesive layer is formed : Layer structure of transparent substrate / one layer or two or more light-shielding layers / light-shielding pressure-sensitive adhesive layers Layer constitution (A4): Light shielding Layer structure of light-sensitive substrate / one layer or two or more light-shielding layers / light-shielding pressure-sensitive adhesive layer Layer structure (A5): one layer or two or more light-shielding layers / transparent substrate / transparent pressure-sensitive adhesive layer Structure Layer structure (A6): Layer structure of one layer or two or more light-shielding layers / light-shielding base material / transparent adhesive layer Layer structure (A7): Base material (transparent in layer structure (A3) or (A4)) Surface of substrate or light-shielding substrate) (exposed surface), or surface of light-shielding layer in layer configuration (A5) to (A6) (exposed side) On the surface), a transparent adhesive layer or a light-shielding pressure-sensitive adhesive layer is formed layer structure layer structure (B1 '): transparent substrate / one or more layers of the reflective layer / one layer or two or more layers of light-blocking Layer structure in which a transparent adhesive layer or a reflective adhesive layer is formed on the surface of the transparent substrate (exposed surface) in the layer configuration of the adhesive layer / transparent adhesive layer
Layer structure (B1 ″): Layer structure of transparent substrate / 1 layer or two or more reflective layers / 1 layer or two or more light-shielding layers / transparent adhesive layer, the reflective layer being white Layer constitution layer constitution (B2) which is a white layer presenting : layer constitution of reflective substrate / one layer or two or more reflective layers / one layer or two or more light-shielding layers / transparent adhesive layer Layer constitution (B3): Reflective substrate / layer constitution of one or more light-shielding layers / transparent adhesive layer Layer constitution (B4): one layer or two or more reflective layers / transparent substrate / Layer structure of one or two or more light-shielding layers / transparent adhesive layer Layer structure (B5): One layer or two or more reflective layers / light-shielding substrate / one layer or two or more light-shielding layers / Layer constitution of transparent adhesive layer Layer constitution (B6): one layer or two or more reflective layers / reflective substrate / one layer or two or more light-shielding layers / layer constitution of transparent adhesive layer Layer constitution (B7): The surface (exposed surface) of the substrate (transparent substrate or reflective substrate) in the layer configuration (B2) or (B3), or the surface of the reflective layer in the layer configurations (B4) to (B6) Layer structure in which transparent adhesive layer or reflective adhesive layer is formed on (exposed surface) Layer structure (B8): Transparent adhesive layer or layer in layer structures (B2) to (B6) Layer structure in which the transparent adhesive layer on the side formed on the light-shielding layer in the constitution (B1 ′) or (B7) is a light-shielding adhesive layer. Resistivity: Surface on the measurement surface side of the adhesive tape or sheet Is the surface resistivity of the pressure-sensitive adhesive layer and the surface resistivity of the inner layer adjacent to the pressure-sensitive adhesive layer, the smaller one of the surface resistivity, and the pressure-sensitive adhesive tape or sheet If the surface on the measurement surface side is not the adhesive layer surface, use the adhesive tape. Or the surface resistivity of the surface on the measurement surface side of the sheet The transmittance is 0.3 (%) or less, the reflectance of at least one surface is less than 60 (%),
The resistivity defined below on at least one surface side of the surfaces where the reflectance is less than 60 (%) is 10 ¹² (Ω / □) or more,
It has the following layer configurations (C1) to (C5) or (D1) to (D9),
The pressure-sensitive adhesive tape or sheet, wherein the light-shielding layer having the layer structure is a light-shielding layer for adjusting the transmittance of the pressure-sensitive adhesive tape or sheet to 0.3 (%) or less.
Layer structure (C1): Layer structure of transparent substrate / one or two or more light-shielding layers / transparent substrate / transparent adhesive layer Layer structure (C2): Light-shielding substrate / one layer or two or more layers Layer structure of light-shielding layer / transparent substrate / transparent adhesive layer Layer structure (C3): Layer structure of light-shielding substrate / one or more light-shielding layers / light-shielding substrate / transparent adhesive layer Configuration (C4): Layer configuration of light-shielding base material / 1 layer or two or more light-shielding layers / light-shielding substrate / light-shielding pressure-sensitive adhesive layer Layer configuration (C5): in layer configurations (C1) to (C4) Layer structure in which a transparent adhesive layer or a light-shielding pressure-sensitive adhesive layer is formed on the surface (exposed surface) of a base material (transparent base material or light-shielding base material) Layer structure (D1): Transparent base material 1 layer or 2 or more reflective layers 1 layer or 2 or more light-shielding layers / transparent substrate / transparent adhesive layer layer structure (D2): transparent substrate / 1 layer or 2 layers Layer structure of upper reflective layer / one layer or two or more light-shielding layers / light-shielding substrate / transparent adhesive layer Layer configuration (D3): transparent substrate / one or two or more reflective layers / Layer configuration of one or two or more light-shielding layers / light-shielding base materials / light-shielding pressure-sensitive adhesive layers Layer configuration (D4): Layer side (D1) to (D3) on the side formed on the reflective layer Layer configuration in which transparent substrate is reflective substrate Layer configuration (D5): one layer or two or more reflective layers / transparent substrate / one or two or more light-shielding layers / transparent substrate / Layer constitution of transparent adhesive layer Layer constitution (D6): one layer or two or more reflective layers / transparent substrate / one or two or more light-shielding layers / light-shielding substrate / transparent adhesive layer Layer structure Layer structure (D7): Layer structure of one layer or two or more reflective layers / transparent substrate / one layer or two or more light-shielding layers / light-shielding substrates / light-shielding pressure-sensitive adhesive layers D8) Layer constitution (D9): Layer constitution (layer constitution (D9): Layer constitution (D9): Layer constitution (D9): Layer constitution (D9): Layer constitution (D9) Layer configuration in which a transparent adhesive layer or a reflective adhesive layer is formed on the surface (exposed surface) of the substrate (transparent substrate or reflective substrate) in D1) to (D4) : When the surface of the pressure-sensitive adhesive tape or sheet on the measurement surface side is the pressure-sensitive adhesive layer surface, the smaller of the surface resistivity of the pressure-sensitive adhesive layer and the surface resistivity of the inner layer adjacent to the pressure-sensitive adhesive layer If the surface of the pressure-sensitive adhesive tape or sheet on the measurement surface side is not the surface of the pressure-sensitive adhesive layer, the surface resistivity of the surface of the pressure-sensitive adhesive tape or sheet on the measurement surface side   The pressure-sensitive adhesive tape or sheet according to claim 1, wherein the light-shielding layer is a printed layer formed between the substrate and the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 3, wherein the light-shielding layer is a black layer exhibiting black.   The pressure-sensitive adhesive tape or sheet according to claim 4, wherein the black layer is formed of a mixed ink composition in which a cyan color material, a magenta color material, and a yellow color material are mixed.   The pressure-sensitive adhesive tape or sheet according to claim 4 or 5, wherein the black layer has a multilayer structure.   The adhesive tape or sheet according to any one of claims 1 to 6, wherein the reflectance of one surface is 60 (%) or more.   The pressure-sensitive adhesive tape or sheet according to claim 7, wherein a reflective layer for making the reflectance of one surface 60% or more is formed on the surface of the base material side with respect to the light-shielding layer.   The pressure-sensitive adhesive tape or sheet according to claim 8, wherein the reflective layer is a white layer exhibiting white color or a silver color layer exhibiting silver color.   The pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 9, which is used 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 the adhesive tape according to any one of claims 1 to 9 or A liquid crystal display device fixed by a sheet.