JP2017031344A - Colored adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a colored adhesive tape in which the color fading of a colored layer and color migration to the body to be adhered are suppressed.SOLUTION: Provided is a colored adhesive tape 1 comprising: a sheet-shaped first base material 21; an adhesive layer 3 laminated on either side of the first base material 21; a colored layer 23 colored and laminated on the other side of the first base material 21; and a sheet-shaped second base material 22 laminated on the colored layer 23. The colored layer 23 includes an adhesive and a coloring agent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a colored adhesive tape.

Conventionally, as an adhesive tape used when joining sheet-like webs and articles, for example, (1) making it easy to discriminate the joining portion, that is, making it easy to discriminate whether or not the adhesive tape is affixed. , (2) Check the position where the adhesive tape is affixed, (3) When shipping articles with the adhesive tape affixed during the work process, make it easier to check forgetting to remove the adhesive tape, etc. For the purpose, a colored adhesive tape colored in a color different from the color of the web or article is often used.
For example, Patent Document 1 discloses a pressure-sensitive adhesive tape having a base material and an adhesive layer formed on one side of the base material, wherein at least one of the base material and the adhesive layer is colored. Is disclosed.

JP 2006-289991 A

  By the way, conventionally, as a method of coloring an adhesive tape, a method of coloring a base material and a method of coloring an adhesive are generally used. As a method for coloring the substrate, for example, (1) a method in which a master batch containing a colorant such as a pigment or dye is kneaded into a raw material resin of the substrate, and (2) a colorant is applied to the surface of the substrate. Examples thereof include a method of printing a dispersed and contained resin layer, and (3) a method of coloring a substrate by pressure high temperature dyeing, solvent dyeing, and the like. Moreover, as a method of coloring an adhesive layer, (4) The method of forming an adhesive layer by apply | coating the adhesive which disperse | distributed and contained the coloring agent, etc. are mentioned.

  However, when a colored adhesive tape is produced using the above-described method, the following problems may occur. That is, when the method (1) is adopted, the lot size of the resin per color is large, and the man-hours for melting and kneading between the resin and the colorant and the color change are increased, which is troublesome. In particular, when producing a small amount of various types of colored adhesive tapes, it tends to be disadvantageous in terms of cost and ease of color change. Moreover, when producing a colored adhesive tape by the method of (1), the coloring agent to be used is normally limited to the coloring agent which has heat resistance.

  In addition, when the method (2) is adopted and a single-sided pressure-sensitive adhesive tape is produced by providing a pressure-sensitive adhesive layer on the colored printed layer side of a colored substrate, the adhesive tape is peeled off from the adherend when the adhesive strength is large. In some cases, the colored printing layer is peeled off from the substrate and remains on the surface of the adherend together with the pressure-sensitive adhesive layer. In addition, when the method (2) is adopted and a pressure-sensitive adhesive layer is provided on the surface of the colored substrate opposite to the colored printing layer to produce a single-sided pressure-sensitive adhesive tape, the colored printing layer is exposed on the surface of the pressure-sensitive adhesive tape. Therefore, there is a problem that the colored printed layer is easily damaged. Further, when a dye is used as the colorant in the method (2), since the heat resistance is low, the colorant is modified when stored under high temperature or high humidity conditions or when stored for a long time at room temperature, There is a case where fading (fading) of the colored printing layer occurs.

  Furthermore, when the method (3) is adopted, there is a possibility that the base material may be deformed at the time of dyeing by high temperature immersion or solvent immersion. When the method (3) is adopted, problems are likely to occur in terms of safety, facilities, energy, and the like.

  Furthermore, when the method (4) is adopted, there may be a case where the adhesiveness is lowered by adding a colorant to the adhesive. In addition, since the adhesive has a low glass transition temperature, depending on the type of polymerization initiator used in the synthesis of the adhesive, the functional group of the adhesive, and the colorant, it may be stored under high temperature or high humidity conditions, or at room temperature for a long time. When stored, the colorant may be denatured, causing the adhesive layer to fade (fading) or to cause color transfer to the adherend.

  An object of this invention is to provide the colored adhesive tape which suppressed the color fading (fading) of a colored layer and the color transfer to a to-be-adhered body cheaply.

As a result of intensive investigations by the present inventors, a composite base material in which a colored layer is sandwiched between two base materials is used as a base material, and an adhesive layer is provided on one surface side of the composite base material. It has been found that the use of an adhesive tape having the above-described structure can provide a colored adhesive tape in which color layer fading (fading) and color transfer to an adherend are suppressed, and can be provided at low cost.
That is, the colored adhesive tape to which the present invention is applied is a sheet-like first base material, an adhesive layer laminated on one surface of the first base material, and the other side of the first base material. The colored layer laminated | stacked on the surface of this, and the sheet-like 2nd base material laminated | stacked on the said colored layer.
Here, the colored layer may include an adhesive and a colorant.
The colored layer may include an adhesive layer containing an adhesive and a colored printed layer containing the colorant and in contact with the adhesive layer.
Furthermore, the total thickness may be in the range of 15.5 μm to 140 μm.
Furthermore, the total thickness of the first base material, the colored layer, and the second base material is in the range of 10.5 μm to 90 μm.
The pressure-sensitive adhesive layer may include at least one selected from a silicone-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive as a pressure-sensitive adhesive.

  According to the present invention, since the colored layer has a configuration in which both surfaces are sandwiched between the first base material and the second base material, it is suppressed that the colored layer directly touches the outside air or the adherend. For this reason, according to this invention, the colored adhesive tape which suppressed the color fading (fading) and the color transfer to a to-be-adhered body of a colored layer can be provided at low cost.

It is the figure which showed an example of the structure of the colored adhesive tape to which this Embodiment is applied.

Embodiments of the present invention will be described below.
[Configuration of colored adhesive tape]
FIG. 1 is a diagram illustrating an example of a configuration of a colored adhesive tape 1 to which the exemplary embodiment is applied. As shown in FIG. 1, the colored adhesive tape 1 of this Embodiment has the structure where the composite base material 2 and the adhesive layer 3 were laminated | stacked. The colored adhesive tape 1 of the present embodiment is used for so-called splicing, for example, for joining sheet-like webs, articles and the like. The colored adhesive tape 1 is colored in a color different from the color of the web or article that is the adherend in order to make it easy to understand the bonded portion of the web or article.

  Moreover, although illustration is abbreviate | omitted, the colored adhesive tape 1 may be equipped with the anchor coat layer between the composite base material 2 and the adhesive layer 3 as needed. The surface of the composite substrate 2 (surface opposite to the surface facing the pressure-sensitive adhesive layer 3) may be subjected to surface treatment. Furthermore, a release liner may be provided on the surface of the pressure-sensitive adhesive layer 3 (the surface opposite to the surface in contact with the composite substrate 2).

In the colored adhesive tape 1 of the present embodiment, the total thickness of the composite base material 2 and the adhesive layer 3 is not particularly limited, but may be in the range of 15.5 μm to 140 μm. preferable.
In the case where the total thickness of the colored adhesive tape 1 is less than 15.5 μm, for example, it is necessary to reduce the thickness of the first base material 21 and the second base material 22. In some cases, the composite substrate 2 may be wrinkled. Moreover, there exists a possibility that the intensity | strength of the colored adhesive tape 1 may fall. On the other hand, when the total thickness of the colored adhesive tape 1 is thicker than 140 μm, for example, the followability of the colored adhesive tape 1 with respect to the unevenness formed on the adherend may be lowered, or it may be difficult to realize the thinning. There is. Further, after the adherends such as webs and articles are joined to each other with the colored adhesive tape 1, when the adherend is wound, a difference in level is likely to occur on the adherend, and a step mark is formed on the adherend. May be.

<Composite substrate>
The composite substrate 2 of the present embodiment is configured such that a colored layer 23 colored in a predetermined color is sandwiched between a first substrate 21 and a second substrate 22. In other words, the composite base material 2 has a structure in which the first base material 21, the colored layer 23, and the second base material 22 are laminated in this order. Moreover, in the colored adhesive tape 1 of this Embodiment, the adhesive layer 3 is laminated | stacked on the surface by the side of the 1st base material 21 in the composite base material 2. FIG.
In the colored adhesive tape 1 of the present embodiment, the composite base material 2 has a laminated structure in which the colored layer 23 is sandwiched between the first base material 21 and the second base material 22, so that the colored layer 23 is directly Touching outside air is suppressed. Thereby, compared with the case where a base material itself contains a colorant or the case where the surface of a base material is colored, discoloration and fading of the colorant under high temperature and high temperature and humidity are suppressed.

In the present embodiment, the thickness of the composite base material 2, in other words, the combined thickness of the first base material 21, the colored layer 23, and the second base material 22 is not particularly limited. It is preferably in the range of 5 μm or more and 90 μm or less.
In the case where the thickness of the composite base material 2 is less than 10.5 μm, for example, it is necessary to reduce the thickness of the first base material 21 and the second base material 22. In some cases, the composite substrate 2 may be wrinkled. Moreover, there exists a possibility that the intensity | strength of the colored adhesive tape 1 may fall. On the other hand, when the thickness of the composite base material 2 is larger than 90 μm, for example, the followability of the colored adhesive tape 1 with respect to the unevenness formed on the adherend may be reduced or it may be difficult to realize a thin shape. There is. Further, after the adherends such as webs and articles are joined to each other with the colored adhesive tape 1, when the adherend is wound, a difference in level is likely to occur on the adherend, and a step mark is formed on the adherend. May be.
Hereinafter, each layer which comprises the composite base material 2 is demonstrated.

(First base material, second base material)
As the first base material 21 and the second base material 22 of the present embodiment, a polyester film typified by polyethylene terephthalate (PET) or the like, a polyolefin film such as polyethylene (PE) or polypropylene (PP), and ethylene vinyl acetate Polymer (EVA) film, polyimide (PI) film, polyphenylene sulfide (PPS) film, polyethylene or polypropylene / polyethylene terephthalate laminated film, ethylene propylene copolymer / polypropylene laminated film, polyethylene / polypropylene / polyethylene three-layer laminated film, etc. Although it can be used, it is not particularly limited.
The first base material 21 and the second base material 22 may use the same material film, or may use different material films.

  Further, the first base material 21 and the second base material 22 may be subjected to easy adhesion treatment such as corona discharge treatment, ozone treatment, plasma treatment, and easy adhesion anchor coat treatment on the surfaces thereof.

The thicknesses of the first base material 21 and the second base material 22 are not particularly limited as long as wrinkles are not generated when the composite base material 2 is manufactured by lamination, but the thickness is 5 μm or more and 30 μm or less, respectively. Is preferable, and a range of 10 μm or more and 20 μm or less is more preferable. When the thickness of the 1st base material 21 and the 2nd base material 22 becomes thicker than 30 micrometers, the thickness of the coloring adhesive tape 1 whole will become thick. In this case, the followability of the colored pressure-sensitive adhesive tape 1 with respect to the unevenness formed on the adherend may be reduced, or it may be difficult to achieve a reduction in thickness. Further, after joining adherends such as sheet-like webs and articles, when the adherend is wound, a step is likely to occur on the adherend, and a step mark is formed on the adherend. There is a case.
In addition, when using the film of the same material by the 1st base material 21 and the 2nd base material 22, it is preferable to make thickness of the 2nd base material 22 thinner than the thickness of the 1st base material 21.

(Colored layer)
The colored layer 23 includes a colorant for coloring the colored pressure-sensitive adhesive tape 1 into a predetermined color and an adhesive for bonding the first base material 21 and the second base material 22.
The thickness of the colored layer 23 is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 2 μm or less. When the thickness of the colored layer 23 is excessively large, the colored layer 23 tends to be fragile. For example, when the colored adhesive tape 1 is cut, cracks may occur in the colored layer 23. Moreover, when the thickness of the colored layer 23 is excessively thick, unevenness in the thickness of the colored layer 23 is likely to occur, and the smoothness of the colored adhesive tape 1 may be reduced.
In addition, the thickness of the colored layer 23 is preferably 0.5 μm or more, and more preferably 1 μm or more. When the thickness of the colored layer 23 is less than 0.5 μm, the adhesive force between the first base material 21 and the second base material 22 due to the colored layer 23 tends to be insufficient. In this case, the first base material 21 or the second base material 22 may be peeled off in the composite base material 2.
The colored layer 23 is used to bond the colored printed layer provided in advance on at least one of the first base material 21 or the second base material 22 and the first base material 21 and the second base material 22. It is good also as a structure which contacted the transparent adhesive agent.

(Coloring agent)
The colorant used for the colored layer 23 is not particularly limited, and examples thereof include inorganic pigments, organic pigments, and dyes. Among these, from the viewpoint of the weather resistance of the colored adhesive tape 1, it is preferable to use an inorganic pigment, and from the viewpoint of simplifying the manufacturing process of the colored adhesive tape 1, it is preferable to use a dye.
Examples of the inorganic pigment used for the colored layer 23 include carbon black, titanium oxide, zinc white, zinc oxide, tripone, iron oxide, aluminum oxide, silicon dioxide, kaolinite, montmorillonite, talc, barium sulfate, calcium carbonate, silica. , Alumina, Cadmium Red, Red, Molybdenum Red, Chrome Vermilion, Molybdate Orange, Yellow Lead, Chrome Yellow, Cadmium Yellow, Yellow Iron Oxide, Titanium Yellow, Chrome Oxide, Pyridian, Cobalt Green, Titanium Cobalt Green, Cobalt Chrome Green , Ultramarine blue, ultramarine blue, bitumen, cobalt blue, cerulean blue, manganese violet, cobalt violet, mica and the like.

Examples of the organic pigment used for the colored layer 23 include azo, azomethine, polyazo, phthalocyanine, quinacridone, anthraquinone, indigo, thioindigo, quinophthalone, benzimidazolone, isoindoline, iso And indolinone pigments.
Examples of the dye used for the colored layer 23 include azo dyes, anthraquinone dyes, indigo dyes, phthalocyanine dyes, carbonyl dyes, quinone imine dyes, methine dyes, quinoline dyes, and nitro dyes.

(adhesive)
The adhesive used for the colored layer 23 is not particularly limited, and examples thereof include ester resins, acrylic resins, amideimide resins, urethane resins, epoxy resins, phenol resins, vinyl acetate resins, ethylene / acetic acid resins. Adhesives such as vinyl copolymer resins, styrene / butadiene rubber resins, vinyl chloride resins, chloroprene rubber resins, nitrile rubber resins, recycled rubber resins, and silicone resins can be used.

<Adhesive layer>
The pressure-sensitive adhesive layer 3 is formed of a pressure-sensitive adhesive. Although the kind of adhesive which comprises the adhesive layer 3 is not specifically limited, For example, an acrylic adhesive, a silicone adhesive, a rubber adhesive, a hot-melt adhesive, etc. can be used. .
Among these, from the viewpoint of the heat resistance in the drying process when producing the colored adhesive tape 1, the relationship with the release liner to be bonded on the adhesive layer 3, the adhesive properties for various adherends of different materials, and the like. It is preferable to use a silicone-based adhesive.

(Silicone adhesive)
Examples of the silicone pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 3 include addition reaction type silicone pressure-sensitive adhesives and peroxide-curing type silicone pressure-sensitive adhesives, which may be used alone or in combination.
Although it does not specifically limit as an addition reaction type silicone adhesive used for the adhesive layer 3, For example, Shin-Etsu Chemical Co., Ltd. KR3700, KR3701, X-40-3237-1, X-40- 3240, X-40-3291-1, X-40-3229, X-40-3270, X-40-3306, TSR1512, TSR1516, XR37-B9204 manufactured by Momentive Performance Materials, Toray Dow Examples thereof include SD4584, SD4585, SD4560, SD4570, SD4600PFC, and SD4593 manufactured by Corning.

  Although it does not specifically limit as a crosslinking agent for bridge | crosslinking an addition reaction type silicone adhesive, For example, Shin-Etsu Chemical Co., Ltd. X-92-122, Momentive Performance Materials company make CR50, BY24-741 manufactured by Toray Dow Corning, etc. can be used.

  Examples of the peroxide curable silicone pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 3 include KR100 and KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd., YR3340, YR3286, PSA610-SM and XR37 manufactured by Momentive Performance Materials. -B6722 and SH4280 manufactured by Toray Dow Corning.

  Although it does not specifically limit as a crosslinking agent for bridge | crosslinking a peroxide curable silicone type adhesive, For example, a benzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di ( t-butylperoxy) hexane, 1,1′-di-t-butylperoxy-3,3,5-trimethylenecyclohexane, 1,3-di- (t-butylperoxy) -diisopropylbenzene, and the like.

(Acrylic adhesive)
The acrylic pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 3 is composed of a copolymer of a (meth) acrylic acid alkyl ester monomer and a polar group-containing monomer and a crosslinking agent. When using an acrylic adhesive, the adhesive layer 3 is formed by drying the solvent (for example, toluene, ethyl acetate, xylene, n-hexane etc.) or water in an acrylic adhesive. Alternatively, a photopolymerization initiator (for example, Irgacure 184, Irgacure 651, Irgacure 369, Irgacure 819 () is added to the (meth) acrylic acid alkyl ester monomer, the polar group-containing monomer and the polyfunctional acrylate in the acrylic adhesive. BASF Japan Co., Ltd.), Chivacure TPO, Chivacure 107, Chivacure 173, Chivacure 1256 (Chaitech Co., Ltd., etc.) are added in an amount of 0.001 to 5.0 parts by weight, and ultraviolet (UV) polymerization is performed to form the adhesive layer 3 To do.

  Examples of the copolymer of the (meth) acrylic acid alkyl ester monomer and the polar group-containing monomer include, for example, a copolymer of 2-ethylhexyl acrylate and acrylic acid, isooctyl acrylate and 2-hydroxy methacrylate. A copolymer with ethyl, a terpolymer of butyl acrylate, acrylic acid and 2-hydroxyethyl methacrylate, and the like are used, but not particularly limited thereto.

Examples of the (meth) acrylic acid alkyl ester monomer described above include, for example, ethyl group, propyl group, butyl group, pentyl group, hexyl group, 2-ethylhexyl group, octyl group, isooctyl group, nonyl group, isononyl group, decyl. Usually, the ester etc. of (meth) acrylic acid which have a C20 or less alkyl group represented by group etc. are mentioned. The above (meth) acrylic acid alkyl esters are used alone or in combination of two or more.
Examples of the polar group-containing monomer include acrylic acid, methacrylic acid, itaconic acid, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, dimethylaminoethyl acrylate, acrylonitrile, and acrylic acid-β-carboxyl. Examples include ethylenic (β-CEA), methacrylonitrile, N-vinyl-2-pyrrolidone and the like, and polymerizable unsaturated monomers having polar groups such as carboxyl, hydroxyl and amino groups in the molecule. It is done.

  The tackifier for the acrylic adhesive layer is a highly weatherable hydrogenated rosin resin (fully hydrogenated rosin resin), aliphatic fully saturated hydrocarbon resin, hydrogenated terpene resin (fully hydrogenated terpene resin) or Silane coupling agents, specifically, Pine Crystal KE-100, Pine Crystal KE-311, Pine Crystal KE-359, Pine Crystal KE-604 (above, manufactured by Arakawa Chemical Industries), Alcon P-70 , Archon P-100, Archon P-115, Archon P-125, Archon P-140 (above, manufactured by Arakawa Chemical Industries), Clearon P-85, Clearon P-105, Clearon P-115, Clearon P-125, Clearon M-105, Clearon K-100, Clearon K-110 (above, Yashara Chemical Co., Ltd.) And silane coupling agents Z-6011, Z-6020, Z-6050, Z-6041, Z-6044, Z-6920, Z-6075, Z-6300, Z-6825, Z-6033, Z-6062, Z -6860 (manufactured by Toray Dow Corning) or the like is used, but is not particularly limited thereto.

  The crosslinking agent for the acrylic pressure-sensitive adhesive layer is, for example, one having two or more functional groups such as isocyanate group (polyisocyanate) and glycidyl group (epoxy resin) in the molecule, or 1,6-hexanediol. There are polyfunctional acrylates such as diacrylate and triethylene glycol diacrylate, or metal chelate compounds. Specifically, Coronate L, Coronate L-55E, Coronate L-45E (above, manufactured by Tosoh Corporation), TETRAD-C, TETRAD-X (above, manufactured by Mitsubishi Gas Chemical Co., Inc.), curing agent E-AX, curing agent E-5C, curing agent E-100X, curing agent M-5, curing agent M-5A (above, manufactured by Soken Chemical Co., Ltd.), A-HD-NA-1000 (above, manufactured by Shin-Nakamura Chemical Co., Ltd.) However, the present invention is not particularly limited thereto.

(Rubber adhesive)
As the rubber-based pressure-sensitive adhesive (natural rubber pressure-sensitive adhesive and synthetic rubber pressure-sensitive adhesive) used for the pressure-sensitive adhesive layer 3, a composition in which mainly an elastomer, a tackifier, a softening agent, an antiaging agent and the like are added and blended is used. It is done. Among these, when using a solvent-type rubber-based adhesive, the solvent (for example, toluene, ethyl acetate, xylene, n-hexane, etc.) contained in the rubber-based adhesive is dried, and an emulsion-type rubber-based adhesive is used. In the case of using an agent, water contained in the rubber-based adhesive is dried and formed as the adhesive layer 3 on the composite substrate 2.
The rubber adhesive elastomer includes natural rubber, recycled natural rubber, isoprene, polyisobutylene, styrene-isoprene-styrene block copolymer elastomer, styrene-butadiene-styrene block copolymer elastomer, styrene-ethylene-butylene-styrene. A block copolymer elastomer or the like is used, but is not particularly limited thereto.

(Adhesive layer thickness)
In the colored pressure-sensitive adhesive tape 1 of the present embodiment, the thickness of the pressure-sensitive adhesive layer 3 is preferably 150 μm or less, and more preferably 120 μm or less. If the thickness of the pressure-sensitive adhesive layer 3 is greater than 150 μm, the thickness of the colored adhesive tape 1 as a whole will increase. For example, after adhering adherends such as sheet-like webs or articles, the adherend is wound. When it is turned, a step is likely to occur on the adherend, and a step mark may be formed on the adherend. Moreover, there exists a possibility that realization of thickness reduction of the colored adhesive tape 1 may become difficult.
Moreover, it is preferable that the thickness of the adhesive layer 3 is 5 micrometers or more, and it is more preferable that it is 10 micrometers or more. When the thickness of the pressure-sensitive adhesive layer 3 is thinner than 5 μm, the pressure-sensitive adhesive force due to the pressure-sensitive adhesive layer 3 tends to decrease, and the adherends may not be bonded to each other and may be peeled off.

[Production method of colored adhesive tape]
Then, an example of the manufacturing method of the colored adhesive tape 1 of this Embodiment is demonstrated. The colored adhesive tape 1 is formed by laminating an adhesive layer 3 on the composite substrate 2 after forming the composite substrate 2. In addition, the manufacturing method of the colored adhesive tape 1 is not limited to the following method.

First, the coloring adhesive which comprises the colored layer 23 is apply | coated with the gravure roll etc. on the 1st base material 21. FIG. Subsequently, the colored adhesive applied to the first base material 21 is dried by heating at a predetermined temperature, and then the second base material 22 is bonded onto the colored adhesive.
Subsequently, a peeling treatment or the like is performed on the second base material 22 as necessary, and the composite base material 2 in which the first base material 21, the colored layer 23, and the second base material 22 are sequentially laminated is obtained.

  In this example, when the composite base material 2 is produced, since the colored adhesive constituting the colored layer 23 is applied to the first base material 21 and dried, in the step of drying the colored adhesive, together with the colored adhesive The first substrate 21 is also heated. And the 1st base material 21 shrinks by heating and the intensity | strength of the 1st base material 21 improves because the molecular density of the film which comprises the 1st base material 21 increases.

Subsequently, an adhesive is applied on the first substrate 21 of the produced composite substrate 2 to form the adhesive layer 3.
Specifically, for example, when an addition reaction type silicone adhesive is used, a crosslinking agent effective for the addition reaction type silicone adhesive is added to a solution obtained by dissolving the silicone adhesive in an organic solvent such as toluene or xylene. A pressure-sensitive adhesive composition. Next, this pressure-sensitive adhesive composition is applied to the first substrate 21 of the composite substrate 2 with a comma coater, a lip coater or the like so that the thickness after drying becomes uniform. Thereafter, the applied pressure-sensitive adhesive composition is dried at a predetermined temperature, whereby the original fabric of the colored pressure-sensitive adhesive tape 1 in which the pressure-sensitive adhesive layer 3 is laminated on the composite substrate 2 is obtained.

  Next, the present invention will be described more specifically based on examples. However, the present invention is not limited to the following examples.

1. Production of colored adhesive tape 1 (Example 1)
9.2 parts by weight of methyl ethyl ketone, 0.1 part by weight of an oil-soluble organic dye (VALIFAST YELLOW 3150 (trade name) manufactured by Orient Chemical Co., Ltd.) and a copper phthalocyanine sulfonic acid derivative (VALIFAST BLUE 2670 manufactured by Orient Chemical Industry Co., Ltd.) )) 15 parts by weight of a polyester resin (AD-900 (trade name) manufactured by Toyo Morton), polyisocyanate (CAT-RT85 (trade name) manufactured by Toyo Morton) 2.25 weight part was melt | dissolved uniformly and the coloring adhesive A was obtained.
The obtained colored adhesive A was applied on a first substrate 21 made of a 25 μm-thick PET film (BP21 (trade name) manufactured by Nanto Plastic Co., Ltd.) so that the thickness after drying was 3 μm. After drying at 30 ° C. for 30 seconds, a second substrate 22 made of a 12 μm thick PET film (BP21 manufactured by Nanto Plastic Co., Ltd.) was bonded. Thereafter, an anchor coating agent was applied to the surface of the first base material 21, and a release treatment agent was applied to the surface of the second base material 22 to obtain a composite base material 2.

  100 parts by weight of a peroxide curable silicone-based adhesive (KR100 (trade name) manufactured by Shin-Etsu Chemical Co., Ltd.), 2 parts by weight of benzoyl peroxide (Nyper BMT-K40 (trade name) manufactured by NOF Corporation), 50 parts by weight of toluene Was uniformly dissolved to obtain an adhesive a.

  The obtained pressure-sensitive adhesive a is coated and dried on the surface of the first base material 21 to which the anchor coat agent has been applied in the composite base material 2 so that the thickness after drying becomes 30 μm. The colored adhesive tape 1 was obtained.

(Example 2)
Addition reaction type silicone adhesive (KR3700 (trade name) manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts by weight, catalyst (CAT-PL-50T (trade name) manufactured by Shin-Etsu Chemical Co., Ltd.) 0.5 part by weight, toluene 50 parts by weight Was uniformly dissolved to obtain an adhesive b.
A colored adhesive tape 1 was produced in the same manner as in Example 1 except that the adhesive b was used in place of the adhesive a.

(Example 3)
100 parts by weight of an acrylic pressure-sensitive adhesive (Showa Denko Vinylol PSA SV-6460 (trade name)) and 0.5 part by weight of a curing agent (E-AX (trade name) made by Soken Chemical Co., Ltd.) are uniformly dissolved and adhered. Agent c was obtained.
A colored adhesive tape 1 was produced in the same manner as in Example 1 except that the adhesive c was used instead of the adhesive a.

Example 4
Natural rubber (pale crepe) was masticated with a mixing roll to obtain a masticated rubber having a Mooney viscosity ML (100 ° C.) of 50. 20 parts by weight of the resulting rubber paste, 15 parts by weight of an alicyclic saturated hydrocarbon petroleum resin (Arcon P-115 (trade name) manufactured by Arakawa Chemical Industries), an antioxidant (Irganox 1010 manufactured by BASF Japan Ltd.) Name)), 1.5 parts by weight of a curing agent (Coronate L-55E (trade name) manufactured by Tosoh Corporation) and 100 parts by weight of toluene were uniformly dissolved to obtain an adhesive d.
A colored adhesive tape 1 was produced in the same manner as in Example 1 except that the adhesive d was used instead of the adhesive a.

(Example 5)
A colored adhesive tape 1 was produced in the same manner as in Example 3 except that a PP film having a thickness of 40 μm was used as the first substrate 21.

(Example 6)
A colored adhesive tape 1 was prepared in the same manner as in Example 1 except that a 25 μm thick PI film (Kapton 100H (trade name) manufactured by Toray DuPont) was used as the first base material 21.

(Example 7)
Example 1 except that a 19 μm thick PET film (BP21 manufactured by Nanto Plastics Co., Ltd.) was used as the first substrate 21 and a 25 μm thick PPS film (Torelina 3030 (trade name) manufactured by Toray Industries, Inc.) was used as the second substrate 22. In the same manner as in Example 1, a colored adhesive tape 1 was produced.

(Example 8)
A colored adhesive tape 1 was produced in the same manner as in Example 1 except that a PET film (BP21 manufactured by Nanto Plastic Co., Ltd.) having a thickness of 12 μm was used as the first base material 21 and the second base material 22.

Example 9
The same procedure as in Example 1 was performed except that a PET film having a thickness of 100 μm (BP21 manufactured by Nanban Plastic Co.) was used as the first substrate 21 and a PET film having a thickness of 50 μm (BP21 manufactured by Nanban Plastics Co., Ltd.) was used as the second substrate 22. Thus, a colored adhesive tape 1 was produced.

(Comparative Example 1)
Acrylic adhesive (SK Dyne B-500S (trade name) manufactured by Soken Chemical Co., Ltd.) 100 parts by weight, curing agent (E-AX manufactured by Soken Chemical Co., Ltd.) 0.3 parts by weight, coloring agent (SUMIPLAST YELLOW manufactured by Sumitomo Chemical Co., Ltd.) 2.5 parts by weight of GC (trade name) was uniformly dissolved to obtain an adhesive e.
The obtained pressure-sensitive adhesive e is coated and dried on a 50 μm PET film so that the thickness after drying becomes 30 μm to form a pressure-sensitive adhesive layer 3 containing a colorant, whereby a colored pressure-sensitive adhesive tape 1 is obtained. It was.

(Comparative Example 2)
100 parts by weight of an acrylic adhesive (SK Dyne B-500S manufactured by Soken Chemical Co., Ltd.), 0.3 parts by weight of a curing agent (E-AX manufactured by Soken Chemical Co., Ltd.), a coloring agent (SUMIPLAST RED FB manufactured by Sumitomo Chemical Co., Ltd.) )) 0.5 part by weight was uniformly dissolved to obtain an adhesive f.
A colored adhesive tape 1 was produced in the same manner as in Comparative Example 1 except that the adhesive f was used in place of the adhesive e.

(Comparative Example 3)
100 parts by weight of an acrylic adhesive (Olivein BPS5296 (trade name) manufactured by Toyochem Co., Ltd.), 0.5 part by weight of a curing agent (Olivein BXX4773 (trade name) manufactured by Toyochem Co., Ltd.), a colorant (VALIFAST PINK 2312 manufactured by Orient Chemical Industry Co., Ltd.) Product name)) 1.5 parts by weight were uniformly dissolved to obtain an adhesive g.
A colored adhesive tape 1 was produced in the same manner as in Comparative Example 1 except that the adhesive g was used instead of the adhesive e.

2. Color transfer test About the colored adhesive tape 1 produced in Examples 1 to 9, Comparative Example 1 and Comparative Example 2, the presence or absence of color transfer was evaluated by the following method.
When the colored adhesive tape 1 is bonded to a paper separator (SLB-80WD (# 1042) -PO (trade name) manufactured by Sumika Kogyo Co., Ltd.) as a sample and left to stand for one month in an atmosphere of 40 ° C. Whether the color shift from the colored adhesive tape 1 to the paper separator occurs was visually evaluated.

3. Fading test About the colored adhesive tape 1 produced in Examples 1 to 9, Comparative Example 1 and Comparative Example 2, the presence or absence of fading was evaluated by the following method.
When the colored adhesive tape 1 was bonded to a stainless steel plate as a sample, it was visually evaluated whether the colored adhesive tape 1 was faded when left standing at 120 ° C. for 1 month.

4). Evaluation results Table 1 shows the evaluation results of the structures, the color transfer test, and the fading test of the colored adhesive tapes 1 of Examples 1 to 9 and Comparative Examples 1 to 3.

As shown in Table 1, Example 1 to Example in which the pressure-sensitive adhesive layer 3 was provided on one surface of the first base material 21 and the colored layer 23 and the second base material 22 were provided in this order on the other surface. In the colored adhesive tape 1 of No. 9, it was confirmed that there was no color shift to the paper separator, and no fading was observed even after storage in an atmosphere at 120 ° C.
On the other hand, in the colored adhesive tape 1 of the comparative example 1-comparative example 3 which mix | blended the acrylic adhesive and the coloring agent with the adhesive layer 3, it was confirmed that the color transfer to a paper separator generate | occur | produces. Moreover, in the colored adhesive tape 1 of the comparative example 3, it was confirmed that fading generate | occur | produces.

DESCRIPTION OF SYMBOLS 1 ... Colored adhesive tape, 2 ... Composite base material, 3 ... Adhesive layer, 21 ... 1st base material, 22 ... 2nd base material, 23 ... Colored layer

Claims (6)

A sheet-like first base material;
An adhesive layer laminated on one surface of the first substrate;
A colored layer colored and laminated on the other surface of the first substrate;
A colored adhesive tape comprising: a sheet-like second base material laminated on the colored layer.   The colored adhesive tape according to claim 1, wherein the colored layer includes an adhesive and a colorant.   The colored pressure-sensitive adhesive tape according to claim 1, wherein the colored layer has an adhesive layer containing an adhesive and a colored printing layer containing the colorant and in contact with the adhesive layer.   The colored adhesive tape according to any one of claims 1 to 3, wherein the total thickness is in a range of 15.5 µm to 140 µm.   5. The thickness according to claim 1, wherein a total thickness of the first base material, the colored layer, and the second base material is in a range of 10.5 μm to 90 μm. Colored adhesive tape.   The coloring according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive layer contains at least one selected from a silicone-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive as a pressure-sensitive adhesive. Adhesive tape.

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