JP2001279202A - Adhesive tape for indication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive tape for indication slightly generating a harmful substance such as dioxins during incineration, having a low reduction ratio of adhesive strength and antistatic function. SOLUTION: (1) This adhesive tape is characterized in that the adhesive tape is obtained by laying an adhesive layer on one side of a substrate comprising a polyolefin as a main component, the surface resistance value of the substrate is <=1×1014 Ω and the reduction ratio of adhesive strength is <=20%. (2) The adhesive tape is characterized in that the adhesive tape is obtained by laying an adhesive layer on one side of a substrate comprising a polyolefin as a main component, the substrate contains a polymer type antistatic agent and the surface resistance value of the substrate is <=1×1014 Ω.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sign adhesive tape having an antistatic function. The present invention relates to a pressure-sensitive adhesive tape which does not generate harmful substances such as dioxin at the time of incineration and does not cause attachment of dust and dust due to static electricity.

[0002]

2. Description of the Related Art A pressure-sensitive adhesive tape is used for a line tape for marking a section on a floor surface of a factory, a store, an office, a gymnasium, or the like, or a tiger pattern tape indicating a danger at a construction site or in a station yard. Until now, vinyl chloride has been mainly used as a base material for the adhesive tape for marking. However, since vinyl chloride generates harmful substances such as dioxin when incinerated, many alternatives to materials have recently been studied, and alternatives to polypropylene and the like are being advanced.

[0003] However, polypropylene, polyethylene, and the like are easily charged due to their high surface resistance, and dust and dirt are liable to adhere thereto due to static electricity. For this reason, when polypropylene or the like is used for the adhesive tape for marking, the surface is soiled and the appearance is impaired, so that polypropylene and the like are unsuitable materials. As a solution to this problem, an antistatic agent such as a conductive filler or a surfactant is kneaded into the base material or the pressure-sensitive adhesive layer. When kneading the conductive filler as an antistatic agent, it is difficult to clearly show the color for marking, and in order to obtain the desired antistatic effect, it must be added in large amounts, which significantly increases the production cost Also leads to.

On the other hand, when an antistatic agent such as a surfactant is kneaded, the surfactant bleeds out to the surface and releases static electricity therefrom, thereby exhibiting an antistatic effect. However, surfactants generally have a low molecular weight, so the bleed-out amount is not stable, and the antistatic effect changes,
There is a disadvantage that the antistatic effect is lost when the surface is wiped off. Further, when the pressure-sensitive adhesive tape in which the surfactant is kneaded with the base material is rewound into a roll, the surfactant is transferred to the surface of the pressure-sensitive adhesive layer, and there is a fatal problem that the adhesive force is greatly reduced.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pressure-sensitive adhesive tape having a small generation of harmful substances such as dioxin during incineration, a small decrease in adhesive strength, and an antistatic function. That is.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer disposed on one surface of a base material containing polyolefin as a main component. Wherein the substrate has a surface resistance of 1 ×
The present inventors have found that an adhesive tape having a resistance of 10 ¹⁴ Ω or less and a rate of decrease in adhesive strength of 20% or less is a pressure-sensitive adhesive tape having desired characteristics, thereby completing the present invention. That is, the present invention provides (1) a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is disposed on one surface of a substrate containing a polyolefin as a main component, and the surface resistance of the substrate is 1 × 10 ¹⁴ Ω.
And (2) the polyolefin is polyethylene and / or polypropylene, wherein the adhesive tape has a rate of decrease in adhesive strength of 20% or less. Adhesive tape,
(3) The adhesive tape for marking according to (1), wherein the base material contains a polymer type antistatic agent, and (4) the amount of the polymer type antistatic agent is the main component of the base material. 5 to 50 parts by weight per 100 parts by weight of a certain polyolefin, (3) the adhesive tape for labeling, (5) the polymer type antistatic agent is a polyetheresteramide. (3) or (4), wherein the polymer type antistatic agent is a non-chargeable ethylene copolymer ionomer resin. ), An adhesive tape for labeling, (7) a pressure-sensitive adhesive tape according to any one of the above (1) to (6), wherein the substrate has a multilayer structure, and (8) an adhesive layer on one surface of a substrate containing polyolefin as a main component. An adhesive tape that is arranged,
A pressure-sensitive adhesive tape for labeling, wherein the base material contains a polymer type antistatic agent, and the surface resistance value of the base material is 1 × 10 ¹⁴ Ω or less; (9) the polyolefin is polyethylene and / or polypropylene And (10) the polyolefin 1 as a main component of the base material, wherein the amount of the polymer type antistatic agent is (10).
5 to 50 parts by weight based on 00 parts by weight, (8) the adhesive tape for marking, and (11) the polymer type antistatic agent is a polyetheresteramide. (8) the adhesive tape for marking according to (8) above,
(8) wherein the polymeric antistatic agent is a non-chargeable ethylene copolymer ionomer resin, wherein the labeling adhesive tape according to (8) above, and (13) the base material has a multilayer structure. The present invention relates to the adhesive tape for marking of (12).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The surface resistance of the substrate in the present invention is 25 ° C., 65% R
It is a value measured according to JIS K6911 under H conditions, preferably 1 × 10 ¹⁴ Ω or less, particularly preferably 1 × 10 ¹⁴ Ω or less.
¹³ Ω or less. The surface resistance of the substrate is 1 × 10 ¹⁴ Ω
In the case where the value exceeds the above, the surface of the pressure-sensitive adhesive tape having the substrate is easily stained due to adhesion of dirt and dust due to static electricity.

In the present invention, the rate of decrease in the adhesive strength of the pressure-sensitive adhesive tape for marking is 20% or less, preferably 10% or less.
The “rate of decrease in adhesive strength” is calculated from the adhesive strength measured by the measurement method described below, and is calculated based on the adhesive strength of the storage product at room temperature (labeling adhesive tape stored at room temperature for 2 days) (7
The difference in the adhesive strength between 0 ° C and 2d) (the adhesive tape for label stored at 70 ° C for 2 days) is shown as a percentage of the adhesive strength of the product stored at room temperature.

In the present invention, the substrate has a surface resistance of 1 × 1
As a method for reducing the resistance to 0 ¹⁴ Ω or less, a method in which a surfactant is applied to the surface of the substrate or kneaded into the substrate, a method in which a conductive substance such as carbon black or metal is blended in the substrate, A method in which a mold type antistatic agent is blended with the base material, and the above-mentioned method is preferable.

The method for reducing the adhesive force of the pressure-sensitive adhesive tape according to the present invention to 20% or less is a method of blending a conductive substance into the pressure-sensitive adhesive tape, or a method of blending a polymer type antistatic agent into the pressure-sensitive adhesive tape. The above method is preferable from the viewpoint of transparency and coloring property. When a surfactant is applied to the surface of the pressure-sensitive adhesive tape or kneaded into the pressure-sensitive adhesive tape, the rate of decrease in pressure-sensitive adhesive strength exceeds 20%.

The polymer type antistatic agent used in the present invention preferably includes polyetheresteramide and ionomer.

The polyetheresteramide in the present invention is obtained by polycondensing a polyamide having a reactive terminal derived from a polyamide-forming monomer and a dicarboxylic acid with a polyetherdiol having a reactive terminal. And block copolymers as well as random copolymers.

Examples of the polyamide-forming monomer include aminocarboxylic acids (for example, ω-aminocaproic acid, ω-aminoenanthic acid, ω-aminocaprylic acid,
-Aminoperargonic acid, ω-aminocapric acid, 11-
Aminoundecanoic acid, 12-aminododecanoic acid, etc.),
Lactams (eg, caprolactam, enantholactam, laurolactam, undecane lactam, etc.), nylon salts (eg, hexamethylenediamine-adipate, hexamethylenediamine-sebacate, hexamethylenediamine-terephthalate, etc.) and the like. Can be These may be used alone or in combination of two or more.
Of these, preferred are aliphatic polyamide-forming monomers such as ω-aminocaproic acid, 12-aminododecanoic acid, caprolactam, laurolactam and hexamethylenediamine-adipate, and particularly preferred are caprolactam Can be

Examples of the dicarboxylic acid include dicarboxylic acids having a cyclic structure in the molecule (eg, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, dicyclohexyl-4,4′-dicarboxylic acid,
Terephthalic acid, isophthalic acid, phthalic acid, naphthalene
2,7-dicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, sodium 3-sulfoisophthalate, potassium 3-sulfoisophthalate, and a mixture of two or more thereof) Examples thereof include linear or branched dicarboxylic acids having no cyclic structure (for example, adipic acid, azelaic acid, sebacic acid, undecandioic acid, dodecanediacid, and a mixture of two or more of these). These may be used alone or in combination of two or more.

The polyamide of the present invention can be produced in the same manner as in the usual method for producing a polyamide. The number average molecular weight of the polyamide is from 300 to 10,000, preferably from 500 to 5,000.

The polyether diol in the present invention preferably includes polyoxyalkylene glycol and alkylene oxide adducts of bisphenols. These may be used alone or in combination of two or more.
Particularly preferred are alkylene oxide adducts of bisphenols. Examples of the polyoxyalkylene glycol include polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, polyoxyhexamethylene glycol, copolymerized diols of polyoxyethylene oxide and polyoxypropylene oxide, and two kinds thereof. Examples thereof include the above mixtures. Among them, polyoxyethylene glycol is particularly preferred from the viewpoint of antistatic properties. Examples of the alkylene oxide adduct of the bisphenols include bisphenol A (4,4'-dihydroxydiphenyl-2,2-propane), bisphenol F (4,4'-dihydroxydiphenylmethane), and bisphenol S (4,4'- Dihydroxydiphenylsulfone), 4,4'-dihydroxydiphenyl-2,2-
Examples include ethylene oxide adducts of bisphenols such as butane, and preferably ethylene oxide adducts of bisphenol A and bisphenol S.
As long as the object of the present invention is not impaired, dihydroxy compounds other than these may be contained, for example, ethylene glycol, propylene glycol, butanediol, diethylene glycol, cyclohexanediol,
And hydrogenated polybutanediene glycol.

The number average molecular weight of the polyether diol is
Preferably it is 300-5000.

The polyetheresteramide used in the present invention can be obtained by the following method. A method in which a polyamide is obtained by reacting the polyamide-forming monomer with a dicarboxylic acid, a polyether diol is added thereto, and a polymerization reaction is performed at a high temperature under reduced pressure. The above-mentioned polyamide-forming monomer, dicarboxylic acid and polyether diol are simultaneously charged into a reaction vessel, and a polyamide is formed as an intermediate by pressure reaction at a high temperature in the presence or absence of water, and then under reduced pressure. A polymerization reaction between the polyamide and the polyether diol.

In the above polymerization reaction, an esterification catalyst is usually used. Examples of the catalyst include protonic acids such as phosphoric acid, alkali metal, alkaline earth metal, transition metal, organic acid salt of 2B metal, 4B metal and 5B metal, carbonate, sulfate, phosphate, oxide, chloride, and the like. Objects, hydroxides,
Alkoxide and the like. The amount of the catalyst used is usually 0.001 to 0.001 to the total weight of the polyamide-forming monomer, dicarboxylic acid and polyether diol.
5% by weight.

The polyetheresteramide is added to a base material by dispersing an antistatic agent in the same component as that of the polyolefin which is the main component of the masterbatch or the base material and forming a pellet (hereinafter, referred to as a pellet). Via a master pellet). As the master pellet,
For example, "Pelestat series" manufactured by Sanyo Chemical Industries, Ltd.
Can be used.

The non-charged ethylene copolymer ionomer resin in the present invention is a non-charged ethylene copolymer ionomer resin containing an alkali metal as an ion source, and comprises a carboxyl group of an ethylene / unsaturated carboxylic acid random copolymer. A part or all of which has a structure neutralized with an alkali metal, and is not particularly limited as long as it has an antistatic effect. The ionomer does not have to be neutralized with cations in all of the carboxyl groups contained therein.

The unsaturated carboxylic acid preferably includes acrylic acid, methacrylic acid and the like. Preferred examples of the alkali metal include lithium, sodium, and potassium.

The amount of the polymer type antistatic agent in the substrate is 5 to 50 parts by weight, preferably 5 to 30 parts by weight, based on 100 parts by weight of the polyolefin as the main component of the substrate. When the blending amount of the polyetheresteramide is less than 5 parts by weight based on 100 parts by weight of the polyolefin as the main component of the base material, the antistatic effect becomes poor, and when it exceeds 50 parts by weight, the physical properties of the base material (tensile strength) , Elongation, elasticity, and tear strength) are greatly changed, and the cost is further increased.

The main component of the substrate used in the present invention is a polyolefin. Examples of the polyolefin include polyethylene and polypropylene; ethylene-propylene copolymer, ethylene-vinyl acetate copolymer and ethylene-methacrylic acid copolymer. And copolymers of olefins and unsaturated compounds, such as copolymers, propylene-vinyl acetate copolymers, and propylene-methacrylic acid copolymers, and mixtures thereof, and are preferably polyethylene, polypropylene, and ethylene-propylene copolymers. Coalescence, as well as mixtures thereof.

A coloring agent for marking can be added to the substrate of the pressure-sensitive adhesive tape for marking of the present invention. The coloring agent used in the present invention may be a commonly used coloring agent, for example, a commercially available kneading-type coloring pigment, and the like, and the form of addition to the substrate may be a dry blend of pellets.

The amount of the colorant used is 1 to 50 parts by weight, preferably 2 to 30 parts by weight, based on 100 parts by weight of the base material.

The substrate of the present invention contains a polyolefin as a main component, and further contains a colorant and an antistatic agent. Further, as an additive other than the colorant and the antistatic agent, an antioxidant, an ultraviolet absorber, a lubricant, an antiblocking agent, and the like may be contained as needed, as long as the object of the present invention is not impaired.

The substrate of the present invention can be produced by a usual molding method, for example, extrusion molding (for example, inflation method,
T-die method), calendering, and the like, and the molding temperature is 200 to 270 ° C.

The pressure-sensitive adhesive tape of the present invention comprises a pressure-sensitive adhesive layer and a base material, and the surface of the base material which is in contact with the pressure-sensitive adhesive may be subjected to a surface treatment such as corona discharge if necessary to enhance the adhesiveness. . If necessary, the surface of the substrate that does not come into contact with the adhesive may be subjected to a surface treatment such as application of a release agent to reduce unwinding.

The pressure-sensitive adhesive used in the present invention includes, for example, acrylic, natural rubber, synthetic rubber, ethylene-vinyl acetate copolymer, ethylene-acrylate ester, styrene-isoprene block copolymer, and styrene-based. Butadiene block copolymers may be used, and one or more of these may be used, and may be selected from these depending on the adherend to be bonded.

The pressure-sensitive adhesive of the present invention may contain additives such as a slip agent and an antioxidant, if necessary.

The pressure-sensitive adhesive tape for marking of the present invention can be produced in the same manner as a usual method for producing a pressure-sensitive adhesive tape. For example, a pressure-sensitive adhesive is heated and melted, and then applied to a substrate formed by the above method. Obtainable.

The thicknesses of the substrate and the pressure-sensitive adhesive layer differ depending on the application, and the thickness of the substrate is 10 to 2000 μm, preferably 30 to 800 μm, and the thickness of the pressure-sensitive adhesive layer is 5 to 300 μm.
μm, preferably 10 to 180 μm.

The substrate of the present invention has a single-layer or multi-layer structure. If the surface resistance of at least the outermost layer on the side on which the pressure-sensitive adhesive layer is not disposed is 1 × 10 ¹⁴ Ω or less, The third layer other than the layer containing the polyolefin as a main component may be disposed other than the outermost layer as long as the object of the present invention is not impaired. The third layer is not particularly limited as long as it is a layer made of a resin having good adhesion to the adhesive.

[0035]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. Example 1 A master containing 70 parts by weight of propylene homopolymer (Noblen FS-2011D manufactured by Sumitomo Chemical Co., Ltd.), 10 parts by weight of white color pellets (PEONY, Dainippon Ink and Chemicals, Inc.), and polyetheresteramide Pellets (Pelestat 31 manufactured by Sanyo Chemical Industries, Ltd.)
70) 20 parts by weight were dry-blended and extruded at a resin temperature of 220 ° C. using a T-die extruder (40 mmφ) to form a 100 μm thick film. Silicone release agent (KN manufactured by Shin-Etsu Chemical Co., Ltd.)
S-309 / PL-8 = 100/2 weight ratio mixture) was applied at a thickness of 1.0 μm, and styrene-
Isoprene copolymer-based adhesive (Clayton 1107 manufactured by Shell Chemical Co., Ltd./Clearon M-105 manufactured by Yasuhara Chemical Co., Ltd. = 50/50 weight ratio mixture) is 50 μm.
To give an adhesive tape for marking.

Examples 2 to 5 and Comparative Examples 1 to 4 A pressure-sensitive adhesive tape for marking was obtained in the same manner as in Example 1 except that a substrate having the composition shown in Table 1 or 2 was used.

[0037]

[Table 1]

[0038]

[Table 2]

The meaning of each abbreviation in Tables 1 and 2 is shown below. In addition, all the blending amounts in the table are parts by weight. Main component Propylene: Propylene homopolymer (Nobrene FS-2011D manufactured by Sumitomo Chemical Co., Ltd.) Ethylene-propylene: ethylene-propylene random copolymer (Nobrene S-13 manufactured by Sumitomo Chemical Co., Ltd.)
1) Colorant Color pellet: White color pellet (PEONY manufactured by Dainippon Ink and Chemicals, Inc.) Antistatic agent Polyetheresteramide: Master pellet containing polyetheresteramide (Sanyo Chemical Industry Co., Ltd.)
Pelestat 3170) Ionomer: Non-chargeable ethylene copolymer ionomer resin using an alkali metal as an ion source (SD-100 manufactured by DuPont-Mitsui Polychemicals) For plastics 1: Antistatic for polyhydric alcohol derivatives for plastics Agent (Register PE132, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) / Ethylene-propylene random copolymer (Noblen S-131, manufactured by Sumitomo Chemical Co., Ltd.) (5 parts by weight / 95 parts by weight) For plastics 2: Antistatic agent for plastics of polyhydric alcohol derivatives (Register PE139 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) / Ethylene-propylene random copolymer (manufactured by Sumitomo Chemical Co., Ltd.) Noblen S-131) (5 parts by weight / 95 parts by weight) is made into a master batch with a twin-screw kneader Thing was

Experimental Examples Each characteristic test was performed on the pressure-sensitive adhesive tapes for marking obtained in Examples 1 to 5 and Comparative Examples 1 to 4 as follows. Table 3 shows the obtained results. Adhesive strength An adhesive tape for labeling stored at room temperature for 2 days (preserved at room temperature) and a pressure-sensitive adhesive tape for labeling stored at 70 ° C for 2 days (preserved product (70 ° C, 2d)) were cut into 20 mm widths, respectively. A 2 kg rubber roller was reciprocated on the plate and pasted back and forth at 23 ° C. for 30 minutes. After that, the adhesive strength was measured with a tensile tester under the conditions of a pulling speed of 300 mm / min and a peeling angle of 180 ° (products stored at room temperature, stored products ( 70 ° C, 2
d) were measured as A1 and A2, respectively). From the obtained adhesive strengths (A1, A2) and the following formula, the rate of decrease in adhesive strength was calculated.

[0041]

(Equation 1)

Contamination to Adherend The presence or absence of contamination on the surface of the stainless steel plate after peeling off the pressure-sensitive adhesive tape for labeling (preserved product (70 ° C., 2d)) obtained in the above-mentioned adhesion test was visually evaluated. . ○: No contamination, ×: Contaminated

Surface resistance value According to the method specified in JIS K 6911 “General Test Method for Thermosetting Plastics”, the surface of the pressure-sensitive adhesive tape for labeling, that is, the surface of the release treated surface, under an atmosphere of 25 ° C. and 65% RH. The surface resistance was measured.

Surface dirtiness The adhesive tape for marking was cut into a width of 50 mm and a length of 2 m.
This was affixed to the urethane-coated office floor, and the stain on the tape surface one week later was visually determined. ○: No dirt, ×: Dirt

[0045]

[Table 3]

As can be seen from Table 3, when the pressure-sensitive adhesive tape has a high surface resistance value (Comparative Examples 1 and 2), the surface of the pressure-sensitive adhesive tape is easily stained, and when the pressure-sensitive adhesive tape has a large rate of decrease in adhesive force (Comparative Examples 3 and 4). ), Causing contamination of the adherend. In contrast, in the case of the present invention, it was found that dirt did not adhere to the tape surface because the surface resistance was low, and that the adherend was not contaminated because the rate of decrease in adhesive strength was small.

[0047]

According to the present invention, it is possible to provide a pressure-sensitive adhesive tape having little anti-toxic effect such as dioxin due to incineration, a small decrease in adhesive strength, and an antistatic effect. Thus, the marking adhesive tape of the present invention can be used in factories, stores, offices, gymnasiums, factory sites, station yards, and the like.

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 4F100 AK03A AK04A AK07A AK12G AK28G AK41H AK46H AK54H AK70H AL01G AL01H AR00B BA02 CA22A CB05 GB90 JG04 JG04A JL00 JL13 JL13B YY00A04A04 A04A04 A04 A04 A04 A04 A04

Claims (13)

[Claims] 1. A pressure-sensitive adhesive tape comprising a base material containing a polyolefin as a main component and a pressure-sensitive adhesive layer disposed on one surface of a base material, wherein the base material has a surface resistance of 1 × 10 ¹⁴ Ω or less,
A pressure-sensitive adhesive tape for marking, wherein the rate of decrease in adhesive strength is 20% or less. 2. The method according to claim 1, wherein the polyolefin is polyethylene and / or
Or polypropylene.
Adhesive tape for marking as described. 3. The pressure-sensitive adhesive tape according to claim 1, wherein the base material contains a polymer type antistatic agent. 4. The compounding amount of the polymer type antistatic agent is 5 to 100 parts by weight of polyolefin which is a main component of the base material.
The pressure-sensitive adhesive tape according to claim 3, wherein the amount is 50 parts by weight. 5. The method according to claim 3, wherein the polymer type antistatic agent is a polyetheresteramide.
Adhesive tape for marking as described. 6. The pressure-sensitive adhesive tape according to claim 3, wherein the polymer type antistatic agent is a non-chargeable ethylene copolymer ionomer resin. 7. The pressure-sensitive adhesive tape for marking according to claim 1, wherein the substrate has a multilayer structure. 8. An adhesive tape comprising a base material containing a polyolefin as a main component and an adhesive layer disposed on one surface of the base material, wherein the base material contains a polymer type antistatic agent, and the surface of the base material A pressure-sensitive adhesive tape having a resistance value of 1 × 10 ¹⁴ Ω or less. 9. The method according to claim 9, wherein the polyolefin is polyethylene and / or
Or polypropylene.
Adhesive tape for marking as described. 10. The compounding amount of the polymer type antistatic agent is 5 to 100 parts by weight of polyolefin which is a main component of the base material.
9. The pressure-sensitive adhesive tape for marking according to claim 8, wherein the amount is from 50 to 50 parts by weight. 11. The pressure-sensitive adhesive tape according to claim 8, wherein the polymer type antistatic agent is a polyetheresteramide. 12. The pressure-sensitive adhesive tape according to claim 8, wherein the polymer type antistatic agent is a non-chargeable ethylene copolymer ionomer resin. 13. The substrate according to claim 8, wherein the substrate has a multilayer structure.
The adhesive tape for marking according to any one of the above.