KR20130132313A - Colored pressure-sensitive adhesive sheet - Google Patents

Abstract

The purpose of the present invention is to make a thin film of an adhesive tape and obtain an ability of hiding defects of an object to be adhered by design, decorative properties, or concealing properties of an object to be adhered to which the adhesive tape is adhered. A half-transparent colored tape (10) comprises a substrate layer (20) and an adhesive layer (30). The substrate layer (20) is formed with plastic materials such as polyethylene terephthalate and the like. The adhesive layer (30) is laminated on one main surface of the substrate layer (20). An acryl-base polymer is appropriately used as the adhesive layer (30). A dye is added to the adhesive layer (30). In the half-transparent colored layer (10), the transmittance rate to 550 nm light is 0.30-60 %.

Description

Colored adhesive sheet {COLORED PRESSURE-SENSITIVE ADHESIVE SHEET}

The present invention relates to an adhesive sheet having a colored layer.

Conventionally, as a light shielding use tape, black pigment dispersion ink and dye were printed on a base material, and what made the transmittance | permeability 0.3% or less is known (refer patent document 1). Moreover, the color adhesive used for an organic light emitting device is known (refer patent document 2).

Japanese Patent Laid-Open No. 2011-214010 Japanese Patent Laid-Open No. 2011-191738

BACKGROUND OF THE INVENTION In recent years, the thinning of portable electronic devices has progressed, and as the use member is thinned, a double-sided tape for bonding and a single-sided tape for protection are also required to be thinned, and a tape having a thickness of 0.030 mm or less is required.

Moreover, although transparent tapes have been enjoyed in the past, colored tapes such as black and white are required for the purpose of concealing the defects of the joining surfaces of the joining members from the viewpoint of design change and designability.

On the other hand, a tape having no light transmittance is difficult to locate in a work such as a processing step or bonding. If it is transparent, it is possible to grasp the shape of a to-be-adhered body by illuminating a backlight from the back surface on the opposite side to join, and can cut the adhesive tape along the said shape. For this reason, it is important from the viewpoint of workability to transmit light in the use which does not need light shielding property.

However, in the tape whose transmittance | permeability described in patent document 1 is 0.3% or less, permeability was inadequate and it was difficult to locate in the operation | work of a processing process, joining, etc. In addition, when the pigment dispersion ink is printed on the substrate, the thickness of the substrate layer becomes thick, and when the tape thickness becomes thin, the ratio of the substrate layer to the thickness becomes large, and it is difficult to secure the thickness of the pressure-sensitive adhesive layer, thereby exhibiting good adhesive strength. It was difficult.

Furthermore, when the pigment dispersion ink is blended into the pressure-sensitive adhesive, when the thickness of the pressure-sensitive adhesive below the dispersion particle diameter of the pigment of the pigment dispersion ink becomes thick, streaks are generated during coating or a mass of pigment particles protrudes from the surface to smooth the coating. Since no cotton was obtained, the layer thickness was difficult.

This invention is made | formed in view of such a subject, The objective is obtaining the performance which hides the fault of a to-be-adhered body by designability, decorativeness, or concealability of the to-be-adhered body to which the said adhesive tape adhere | attaches, while aiming at thinning of an adhesive tape. It is in the provision of technology that can.

Some form of this invention is a colored adhesive sheet. The said colored adhesive sheet is equipped with the base material which consists of a plastic material, and the adhesive layer colored with the dye in at least one surface of the said base material, The transmittance | permeability with respect to the light of 550 nm is 0.30% or more, It is characterized by the above-mentioned. In addition, what is called an adhesive tape, an adhesive label, an adhesive film, etc. can be contained in the concept of the "adhesive sheet" here.

The total thickness of the colored adhesive sheet of the above aspect may be 0.030 mm or less. The thickness of the said base material may be 0.025 mm or less. The thickness of the said adhesive layer may be 0.025 mm or less. The dye may be black. The said adhesive layer may contain the acryl-type polymer which has a (meth) acrylic-acid alkylester as a monomer main component.

Moreover, what suitably combined each element mentioned above can also be included in the scope of the invention which seeks protection by a patent by this patent application.

According to the present invention, the thickness of the adhesive tape can be reduced, and the performance of concealing the defects of the adherend can be obtained by the designability, decorativeness, or hiding property of the adherend to which the adhesive tape adheres.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the laminated constitution of the translucent colored tape which concerns on embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1: is a schematic diagram which shows the laminated constitution of the semitransparent colored tape 10 which concerns on embodiment. The semitransparent coloring tape 10 has the base material layer 20 and the adhesive layer 30. In the translucent colored tape 10 which concerns on embodiment, the transmittance | permeability (%) with respect to the light of 550 nm is 0.30% or more. Although the upper limit of the said transmittance | permeability (%) is not specifically limited, For example, it can be 80% or less, 70% or less is preferable, and 60% or less is more preferable. The total thickness of the translucent colored tape 10 that is the sum of the thickness of the base material layer 20 and the pressure-sensitive adhesive layer 30 is preferably 0.030 mm or less, more preferably 0.025 mm or less, still more preferably 0.020 mm or less, 0.015 mm or less is more preferable, 0.010 mm or less is especially preferable. The lower limit of the total thickness of the translucent colored tape 10 may be thicker than 0.000 mm, and can be 0.001 mm or more, for example.

In addition, the transmittance | permeability (%) of the translucent coloring tape 10 uses the spectrophotometer (the apparatus name "U4100 type spectrophotometer" made by Hitachi Seisakusho), and transmits light whose wavelength is 550 nm to one side of the translucent colored tape 10. It is calculated | required by irradiating from a surface side and measuring the intensity of the light transmitted to the other surface side.

Although it does not specifically limit as the base material layer 20, For example, a plastic material is used. Although it does not specifically limit as said plastic material, Polyolefins, such as polyester, such as polyethylene terephthalate and polybutylene terephthalate, polyethylene, and polypropylene, polyimide, polyamide, polycarbonate, etc. are mentioned. The base material layer 20 is shape | molded the said plastic material in film shape or sheet shape. Black pigments, such as carbon black, may be added to the base material layer 20 in the range which satisfy | fills the above-mentioned transmittance | permeability. That is, what shape | molded in film form or sheet form by adding black pigments, such as carbon black, to a plastic material can be used. Although the thickness of the base material layer 20 will not be specifically limited if the total thickness of the translucent coloring tape 10 becomes 0.030 mm or less, For example, 0.025 mm or less is preferable, 0.020 mm or less is more preferable, 0.015 mm or less is more preferable, 0.010 mm or less is more preferable, 0.0050 mm or less is especially preferable. The minimum of the thickness of the base material layer 20 should just be thicker than 0.000 mm, and can be 0.001 mm or more, for example.

<Pressure-sensitive adhesive layer>

The pressure-sensitive adhesive layer 30 is laminated on one main surface of the base material layer 20. The pressure-sensitive adhesive layer 30 is not particularly limited, and various pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, and silicone pressure-sensitive adhesives can be used. Especially, the acrylic adhesive containing an acrylic polymer is used suitably. Although content of the acrylic polymer in the said acrylic adhesive (100 mass%) is not specifically limited, 50 mass% or more (for example, 50-100 mass%) is preferable, More preferably, it is 60 mass% or more ( For example, it is 60-100 mass%), More preferably, it is 65 mass% or more (for example, 65-100 mass%).

As an acryl-type monomer as an essential monomer component which comprises the said acryl-type polymer, it is preferable to contain the (meth) acrylic-acid alkylester which has a linear or branched alkyl group. That is, it is preferable that the said acrylic polymer is a polymer comprised using the (meth) acrylic-acid alkylester which has a linear or branched alkyl group as an essential monomer component. In other words, it is preferable that the said acrylic polymer is a polymer containing the structural unit derived from the (meth) acrylic-acid alkylester which has a linear or branched alkyl group. As a monomer component which comprises the said acrylic polymer, you may contain copolymerizable monomers, such as the following polar group containing monomers. In addition, said "(meth) acryl" shows "acryl" and / or "methacryl" (any one or both of "acryl" and "methacryl"), and others are also the same. In addition, you may use the said acryl-type monomer individually or in combination of 2 or more types. In addition, you may use the said copolymerizable monomer individually or in combination of 2 or more types.

As (meth) acrylic-acid alkylester (Hereinafter, it may only be called "(meth) acrylic-acid alkylester") which has the said linear or branched alkyl group, For example, methyl (meth) acrylate, ethyl (meth) acrylate, Propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, Isopentyl (meth) acrylate, Hexyl (meth) acrylate, Heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl acrylate (meth) Isononyl acrylate, decyl acrylate, isodecyl methacrylate, undecyl methacrylate, dodecyl acrylate, dodecyl methacrylate, tridecyl methacrylate, tetradecyl methacrylate, meth acrylic acid Pentadecyl, hexaacrylic acid (meth) acrylate (Meth) acrylic-acid alkylester of 1-20 carbon atoms of alkyl groups, such as a decyl (heptadecyl (meth) acrylate, an octadecyl (meth) acrylate, nonadecyl (meth) acrylate, and an echoyl (meth) acrylic acid), is mentioned. In addition, you may use the said (meth) acrylic-acid alkylester individually or in combination of 2 or more types.

Especially, as said (meth) acrylic-acid alkylester, the (meth) acrylic-acid alkylester whose alkyl group has 1 to 14 carbon atoms is preferable, More preferably, n-butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA) are preferable. Isocyanyl acrylate, isononyl acrylate.

As for content of the said (meth) acrylic-acid alkylester in the monomer component whole quantity (100 mass%) which comprises the said acrylic polymer, 65-99 mass% is preferable with respect to 100 mass% of the monomer component whole quantity which comprises an acrylic polymer, More preferably, it is 85-99 mass%.

Examples of the polar group-containing monomer include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and acid anhydride-containing monomers such as maleic anhydride and itaconic anhydride. Carboxyl group-containing monomers such as); Hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, vinyl alcohol and allyl alcohol Hydroxyl group) -containing monomer; (Meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N Amide group-containing monomers such as hydroxyethyl (meth) acrylamide; Amino group-containing monomers such as aminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate and t-butylaminoethyl (meth) acrylate; Epoxy group-containing monomers such as glycidyl (meth) acrylate and methylglycidyl (meth) acrylate; Cyano group-containing monomers such as acrylonitrile and methacrylonitrile; Containing vinyl monomers such as N-vinyl-2-pyrrolidone, (meth) acryloylmorpholine, N-vinylpiperidone, N-vinylpiperazine, N-vinylpyrrole, N- ; Sulfonic acid group-containing monomers such as sodium vinylsulfonate; Phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; Imide group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide; And isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate. In addition, you may use the said polar group containing monomer individually or in combination of 2 or more types.

Especially, as said polar group containing monomer, a carboxyl group containing monomer and a hydroxyl group containing monomer are preferable, More preferably, they are acrylic acid (AA), 2-hydroxyethyl acrylate (HEA), and 4-hydroxybutyl acrylate (4HBA).

Although content of the said polar group containing monomer in the monomer component whole quantity (100 mass%) which comprises the said acrylic polymer is not specifically limited, 1-15 mass% is preferable, More preferably, it is 1-5 mass%.

As the copolymerizable monomer, for example, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, methoxytriethylene glycol (meth) acrylate, 3-methoxypropyl (meth) acrylate, (Meth) acrylic acid alkoxyalkyl esters [alkoxyalkyl (meth) acrylate] such as (meth) acrylic acid 3-ethoxypropyl, (meth) acrylic acid 4-methoxybutyl, and (meth) acrylic acid 4-ethoxybutyl; (Meth) acrylic acid ester, phenyl (meth) acrylate, and phenoxyethyl (meth) which have alicyclic hydrocarbon groups, such as cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, and isobornyl (meth) acrylate (Meth) other than the above-mentioned (meth) acrylic-acid alkylester, (meth) acrylic-acid alkoxyalkyl ester, polar group containing monomer, and polyfunctional monomer, such as (meth) acrylic acid ester which has aromatic hydrocarbon groups, such as acrylate and benzyl (meth) acrylate, ) Acrylic acid ester; Vinyl esters such as vinyl acetate and vinyl propionate; Aromatic vinyl compounds such as styrene and vinyl toluene; Olefins or dienes such as ethylene, butadiene, isoprene and isobutylene; Vinyl ethers such as vinyl alkyl ether; Vinyl chloride, and the like. In addition, these copolymerizable monomers may be named generically as "other copolymerizable monomer."

Moreover, you may contain a polyfunctional monomer in an acryl-type polymer. As the polyfunctional monomer, for example, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acryl Late, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,2-ethylene glycol di (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, 1 , 12-dodecanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethanetri (meth) acrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene , Epoxy acrylate, polyester acrylate, urethane acrylate, butanediol (meth) acrylate, hexanediol (meth) acrylate and the like. Among them, trimethylolpropane tri (meth) acrylate, hexanediol di (meth) acrylate and dipentaerythritol hexa (meth) acrylate can be suitably used. Polyfunctional (meth) acrylate can be used individually or in combination of 2 or more types.

<Polymerization Initiator>

As a polymerization method of the said acrylic polymer, the solution polymerization method, the emulsion polymerization method, the bulk polymerization method, the polymerization method (active energy line polymerization method) by active energy ray irradiation, etc. are mentioned, for example. Among them, the solution polymerization method is preferable in view of workability and cost.

In the case of the said solution polymerization, you may use various general solvents. As such a solvent, Ester, such as ethyl acetate and n-butyl acetate; Aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; Alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; And organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone. You may use the said solvent individually or in combination of 2 or more types.

In addition, at the time of the said superposition | polymerization, polymerization initiators, such as a photoinitiator and a thermal polymerization initiator, may be used. In addition, you may use a polymerization initiator individually or in combination of 2 or more types.

At the time of the said solution polymerization, the thermal polymerization initiator may be used. Although it does not specifically limit as said thermal polymerization initiator, For example, an azo initiator, a peroxide type polymerization initiator (for example, dibenzoyl peroxide, tert- butyl per maleate, etc.), a redox type polymerization initiator, etc. are mentioned. have. Among them, the azo-based initiator disclosed in JP-A-2002-69411 is particularly preferable. Such an azo initiator is preferable because the decomposition product of the initiator hardly remains in the acrylic polymer as a part causing the generation of the heating generating gas (exhaust gas). Examples of the azo initiator include 2,2'-azobisisobutyronitrile (hereinafter may be referred to as AIBN) and 2,2'-azobis-2-methylbutyronitrile (hereinafter referred to as AMBN). 2,2'-azobis (2-methylpropionic acid) dimethyl, 4,4'-azobis-4-cyano valeric acid and the like. In addition, the usage-amount of a thermal polymerization initiator is not specifically limited, What is necessary is just a range which can be used as a polymerization initiator from which desired molecular weight and reactivity are obtained.

The weight average molecular weight of the acrylic polymer is preferably in the range of 400000 to 700000, more preferably 400000 to 650000, still more preferably 400000 to 600000.

In addition, the weight average molecular weight said here is polystyrene conversion which calculated | required the soluble matter (also called the weight average molecular weight of sol powder) which extracted the non volatile matter of the obtained acrylic copolymer from tetrahydrofuran (henceforth THF) by the measurement of GPC. It is a weight average molecular weight.

<Tackifier>

A tackifier may be mix | blended with the said acrylic adhesive. As such a tackifier, 1 type, or 2 or more types chosen from various tackifying resins, such as rosin type resin, rosin derivative resin, petroleum type resin, terpene type resin, phenol type resin, ketone type resin, can be used, for example. Can be. The addition amount of a tackifier is 10-50 mass parts with respect to 100 mass parts of acrylic polymers, Preferably it is 15-40 mass parts.

<Cross-linking agent>

In order to adjust cohesion force, the said acrylic adhesive may contain the crosslinking agent. The crosslinking agent can use a crosslinking agent which is used normally, For example, an epoxy crosslinking agent, an isocyanate type crosslinking agent, a silicone type crosslinking agent, an oxazoline type crosslinking agent, an aziridine type crosslinking agent, a silane type crosslinking agent, an alkyl etherification melamine type crosslinking agent, a metal chelate crosslinking agent, etc. Can be mentioned. In particular, an isocyanate crosslinking agent and an epoxy crosslinking agent can be used suitably. The usage-amount of a crosslinking agent is 0.001-10 mass parts normally with respect to 100 mass parts of acrylic polymers, Preferably it is 0.001-5 mass parts.

Specifically, as an example of an isocyanate type crosslinking agent, tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, Adducts with polyols, such as tetramethyl xylylene diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, polymethylene polyphenyl isocyanate, and these trimethylol propane, are mentioned.

Examples of the epoxy crosslinking agent include bisphenol A, an epoxy resin of epichlorohydrin type, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, and 1,6-hexane. Diolglycidyl ether, trimethylolpropanetriglycidyl ether, diglycidyl aniline, diamineglycidylamine, N, N, N ', N'-tetraglycidyl-m-xylylenediamine and 1, 3-bis (N, N- diglycidylaminomethyl) cyclohexane etc. are mentioned.

The adhesive layer 30 of this embodiment is colored with dye. Dye can be used individually or in combination of 2 or more types. As the dye, any type of dyes such as natural dyes or synthetic dyes (for example, monoazo dyes, disazo dyes, metal complex dyes, acid dyes, reactive dyes, direct dyes, disperse dyes, cationic dyes, etc.) may be used. It is possible to use, Preferably it is organic dyes, such as a monoazo dye, a disazo dye, and a metal complex salt dye. The dye may be a water-soluble dye, or may be a oil-soluble dye, and may be appropriately selected depending on the pressure-sensitive adhesive to be colored. For example, when coloring the adhesive composition containing the organic solvent containing the polymer obtained by solution polymerization, oil-soluble dye may be used, and the adhesive composition containing water containing the polymer obtained by emulsion polymerization is colored. In order to make it use, a water-soluble dye may be used. The color of the dye is not particularly limited in view of the purpose of matching with the color of the material to be bonded, but black is highly concealable in view of hiding the designability, defects of the bonding material, and the like. The content of the dye in the pressure-sensitive adhesive layer 30 is not particularly limited as long as it can be colored in a desired color. For example, the pressure can be 0.3 to 20 mass% in the pressure-sensitive adhesive layer, and 0.5 to 15 mass% is preferable.

Various additives may be mix | blended with the adhesive other than the dye mentioned above. Examples of such additives include crosslinking accelerators, silane coupling agents, antioxidants, fillers, ultraviolet absorbers, antioxidants, chain transfer agents, plasticizers, softeners, antistatic agents, and the like.

Although the formation method of the adhesive layer 30 is not specifically limited, For example, a solvent type acrylic adhesive composition can be apply | coated (coated) to one side or both sides of a base material, and it can form by drying and / or hardening. Moreover, the adhesive layer obtained by apply | coating (coating) a solvent type acrylic adhesive composition on a separator etc., and drying and / or hardening can be formed by transferring to the single side | surface or both sides of a base material.

In addition, at the time of application | coating (coating) of the said acrylic adhesive composition, it is possible to use a well-known coating method, and a conventional coater, for example, a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar A coater, knife coater, spray coater, comma coater, direct coater and the like can be used.

The thickness of the pressure-sensitive adhesive layer 30 is not particularly limited as long as the total thickness of the translucent colored tape 10 is 0.030 mm or less, but is preferably 0.025 mm or less, more preferably 0.020 mm or less, and 0.015 mm or less. More preferably, 0.010 mm or less is more preferable, 0.005 mm or less is especially preferable. The lower limit of the thickness of the pressure-sensitive adhesive layer 30 may be thicker than 0.000 mm, and preferably 0.001 mm or more. By setting the thickness of the pressure-sensitive adhesive layer 30 to 0.001 mm or more, the adhesive force tends to be increased, and the adherend can be held more reliably.

According to the translucent colored tape 10 demonstrated above, the performance which hides the fault of a to-be-adhered body by designability, decorativeness, or concealability to the to-be-adhered body to which the said tape adheres can be obtained, and the light transmittance at the time of backlight irradiation. For this reason, after adhering the translucent colored tape of the magnitude | size larger than a to-be-adhered body to a to-be-adhered body, the shape of a to-be-adhered body can be grasped | ascertained through a translucent colored tape by irradiating a backlight from the adhesive layer 30 side. Moreover, based on the shape grasped | ascertained, the translucent colored tape of the excess part can be cut reliably and easily.

In addition, in coloring the translucent colored tape 10, dye was added to the adhesive layer 30, without printing a pigment. For this reason, since it is not necessary to provide a printing layer for coloring separately, since the thickness of an adhesive layer can be thickened compared with the structure of the semi-transparent coloring tape 10, and even if it is the same thickness with a printing layer, favorable adhesiveness Can be planned.

In addition, in this embodiment, although the translucent colored tape 10 as a single-sided adhesive tape in which the adhesive layer 30 was laminated | stacked on one side of the base material layer 20 is illustrated, an adhesive layer is formed on both surfaces of the base material layer 20, respectively. It is good also as a double-sided adhesive tape in which 30 was laminated. The total thickness of the translucent colored tape 10 in this case becomes the sum of the thickness of the base material layer 20 and the thickness of the adhesive layer 30 of two layers.

[Example]

EMBODIMENT OF THE INVENTION Although this invention is demonstrated in detail based on an Example below, this invention is not limited by these Examples. In addition, in this Example, "part" means a "mass part" unless there is particular notice.

(Production of Adhesive Composition)

Butyl acrylate: 70 parts, 2 ethylhexyl acrylate: 30 parts, acrylic acid: 3 parts, 4-hydroxybutyl acrylate: 0.05 part, 2,2'-azobisisobutyronitrile: 0.08 part as polymerization initiator , Solution polymerization was carried out for 6 hours in a mixed solution of toluene and ethyl acetate [toluene / ethyl acetate (mass ratio) = 1/1] to obtain a weight average molecular weight: 500,000 acrylic polymer. The acrylic polymer: 100 parts of polymerization rosin pentaerythritol ester resin (brand name "Pen Cell D125" Arakawa Chemical Industries, Ltd .; softening point: 125 ° C): 30 parts, isocyanate-based crosslinking agent (brand name "Coro Nate L "Nippon Polyurethane Co., Ltd.): Three parts were added, and the adhesive (pressure sensitive adhesive composition) was manufactured by stirring and mixing so that it might become uniform.

(Example 1)

The mass of the oil-soluble disazo dye (12) adjusted to black was added to the above-mentioned adhesive, it melt | dissolved, and it fully stirred. Using this solvent-type pressure-sensitive adhesive solution (adhesive 1), the coating film was applied to a peeling treatment surface of a 0.038 mm thick PET separator (trade name "Diafoil MRF-38", manufactured by Mitsubishi Chemical Co., Ltd.) so as to have a dry coating thickness of 0.002 mm. , It dried at 100 degreeC for 2 minutes, the film base material (brand name "Lumirror # 5AF53", Toray Corporation make, thickness 0.004mm) made of polyester was bonded to this adhesive layer surface, and the single-sided adhesive tape of thickness 0.006mm was produced.

(Example 2)

Using the pressure-sensitive adhesive (1) used in Example 1, it was applied to a peeling treatment surface of a 0.038 mm-thick PET separator (trade name "Diafoil MRF-38", manufactured by Mitsubishi Chemical Co., Ltd.) so as to have a dry coating film thickness of 0.002 mm. , It dried at 100 degreeC for 2 minutes, the film base material (brand name "Lumirror # 2DC61", Toray Corporation make, thickness 0.002mm) made of polyester was bonded to this adhesive layer surface, and the process product (1) was obtained.

Subsequently, the adhesive 1 described above was applied to a peeling treatment surface of a 0.075 mm-thick PET separator (trade name "Purex Film A31-75μ", manufactured by Teijin DuPont Film Co., Ltd.) so as to have a dry coating film thickness of 0.002 mm. It dried at 2 degreeC at 2 degreeC, this adhesive layer surface and the PET base material surface of the process product (1) mentioned above were bonded, and the double-sided adhesive tape of 0.006 mm in total thickness was produced.

(Example 3)

1 mass part of oil-soluble disazo dyes which blackened to the adhesive mentioned above were added, melt | dissolved, and it fully stirred. Using this solvent-type pressure-sensitive adhesive solution (adhesive 2), it was applied to a peeling surface of a PET separator (trade name "Diafoil MRF-38" manufactured by Mitsubishi Chemical Industries, Ltd.) having a thickness of 0.038 mm so as to have a dry coating thickness of 0.002 mm. , It dried at 100 degreeC for 2 minutes, the film base material (brand name "Lumirror # 2DC61", Toray Corporation make, thickness 0.002mm) made of polyester was bonded to this adhesive layer surface, and the process product (2) was obtained.

Subsequently, the adhesive 2 described above was applied to a peeling treatment surface of a 0.075 mm-thick PET separator (trade name "Purex Film A31-75μ", manufactured by Teijin DuPont Film Co., Ltd.) so as to have a dry coating film thickness of 0.002 mm. It dried at 2 degreeC for 2 minutes, and bonded this adhesive layer surface and the PET base surface of the process product 2 mentioned above, and produced the double-sided adhesive tape of 0.006 mm in total thickness.

(Comparative Example 1)

Mass part of the oily pigment dispersion ink 12 of carbon black was added to the adhesive mentioned above, and it fully stirred. Using this solvent type adhesive solution [adhesive (3)], dry film thickness was set to 0.002 mm on the peeling process surface of 0.038 mm of thickness PET separator (brand name "Dia foil MRF-38", the Mitsubishi Chemical Corporation). It is apply | coated and dried at 100 degreeC for 2 minutes, and the film base material (brand name "Lumirror # 5AF53", product made by Toray Industries, thickness 0.004mm) made of polyester was bonded to this adhesive layer surface, and the single-sided adhesive tape of 0.006mm bonding thickness was produced. did. In addition, the entire surface could not produce a clean application because of the stripes and lumps.

(Comparative Example 2)

Printing was carried out using black ink on one surface of a film base material made of polyester (trade name "Lumirror # 5AF53", manufactured by Toray Industries, Inc., 0.004 mm thick) (5 times of printing times) to form a light shielding layer having a thickness of 0.005 mm. The process product (3) was obtained. The adhesive 3 mentioned above was apply | coated to the peeling process surface of 0.038mm-thick PET separator (brand name "Diafoil MRF-38", the product made by Mitsubishi Chemical Industries, Ltd.) so that dry film thickness might be set to 0.001mm, and 100 degreeC, 2 minutes It dried and bonded the light shielding layer of the process product 2 to this adhesive layer surface, and produced the single-sided adhesive tape of thickness 0.010mm.

Hereinafter, the characteristic evaluation method and result of each adhesive tape are demonstrated. In addition, in Comparative Example 1, since the entire surface of the tape was not uniformly coated with stripes and lumps, no characteristic could be measured.

(Adhesion evaluation)

The single-sided adhesive tape bonded and single-sided tape (brand name "No.31B", the Nitto Denko make) to the base material side. In the case of a double-sided adhesive tape, the peeling liner of one side was peeled off, it adhered to the polyethylene terephthalate (PET) film of thickness 0.025mm, and contacted. A sample piece was produced by cutting this adhesive tape bonded to 20 mm in width and 100 mm in length. The peeling liner was peeled off from the other side of the sample piece, and the sample piece was pressed by a method in which a 2 kg roller was reciprocated to the adherend. The adherend used a SUS304BA plate. After crimping | bonding, after leaving for 20 minutes in the measurement environment of the temperature of 23 degreeC, and 50% of a relative humidity, peeling strength (N / 20mm) was measured on the conditions of 300 mm / min of tensile velocity, and 180 degree of tensile angles using the tensile tester.

(Holding capacity evaluation)

In the same manner as in the evaluation of adhesive force, a sample piece was prepared by cutting the bonded adhesive tape into a size of 10 mm in width and 100 mm in length. The peeling liner was peeled off from the other side of the sample piece, and the sample piece was pressed onto the bakelite plate as the adherend by a method in which a 2 kg roller was reciprocated with a bonding area of 10 mm in width and 20 mm in length. After leaving this sample piece vertically lowered in 40 degreeC environment, and leaving it for 30 minutes, the free end of a sample piece was applied to 500 g and left for 1 hour in 40 degreeC environment with the said load applied according to JISZ0237. The distance (mm) of the shift | offset | difference of the sample piece in later was measured.

(Transmission evaluation)

About each adhesive tape of Examples 1, 2, 3, and Comparative Examples 1 and 2, the wavelength of transmittance | permeability is irradiated by irradiating the light of wavelength 550nm from one side of an adhesive tape, and measuring the intensity of the light transmitted to the other side. The dependency was evaluated. Evaluation of the transmittance | permeability was performed on condition of the following. The obtained results are shown in Table 1.

Device: U-4100 Spectrophotometer (made by Hitachi)

Light incident angle: 0 °

The adhesive tapes of Examples 1, 2, and 3 shown in Table 1 have both the design and the transmittance in the range of 0.30 to 60%, and have a total thickness of 0.030 mm or less. Moreover, it was confirmed that adhesive force is 3.0 N or more and is equipped with sufficient adhesiveness as an adhesive tape.

On the other hand, Comparative Example 2 had good light shielding properties, but the adhesive strength was low at 1N, resulting in poor adhesiveness.

10: translucent coloring tape
20: substrate layer
30: pressure-sensitive adhesive layer

Claims (6)

A substrate,
At least one side of the substrate is provided with a pressure-sensitive adhesive layer,
The transmittance | permeability with respect to the light of 550 nm is 0.30% or more, The colored adhesive sheet characterized by the above-mentioned. The colored adhesive sheet of Claim 1 whose total thickness is 0.030 mm or less. The colored adhesive sheet of Claim 1 or 2 whose thickness of the said base material is 0.025 mm or less. The colored adhesive sheet in any one of Claims 1-3 whose thickness of the said adhesive layer is 0.025 mm or less. The colored adhesive sheet in any one of Claims 1-4 whose said dye is black. The colored adhesive sheet in any one of Claims 1-5 in which the said adhesive layer contains the acryl-type polymer which has a (meth) acrylic-acid alkylester as a monomer main component.

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