JPH0547249A - Flame resisting tape - Google Patents

Abstract

PURPOSE:To provide a halogen-free non-polluting type polyolefin flame resisting adhesive tape having high flame resistance, which is excellent in mechanical strength, electric characteristic, flexibility and molding workability, and generate no toxic gas such as halogen gas at the time of combustion. CONSTITUTION:An adhesive material layer is provided on a base surface consisting of a polyolefin resin composite containing the following (A) and (B). The polyolefin resin composite is formed of 100 parts by weight of (A) a polyolefin resin (A1), a polyolefin resin (A2) containing reactive compounds such as A1: carboxylic group, carboxylic ester group and the like, or resin composites thereof, and 30-200 parts by weight of (B) an inorganic flame retarder.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention provides an adhesive material layer on a base sheet made of a polyolefin resin or a polyolefin resin containing a specific reactive compound and a flame-retardant polyolefin resin composition containing an inorganic flame retardant. Flame-retardant adhesive tape, more specifically, it has a high degree of flame-retardant property and does not generate toxic gas such as halogen gas at the time of burning, and it has safety, flexibility, mechanical properties, chemical resistance. Since it is also excellent in electrical characteristics and electrical characteristics,
The present invention relates to a flame-retardant tape that can be used as an insulating tape for electric devices such as vehicles such as trains and buses, aircraft, ships, houses, factories and the like.

[0002]

2. Description of the Related Art Conventionally, an adhesive is applied to a base material made of polyvinyl chloride (abbreviated as PVC) as an insulating tape for vehicles such as automobiles, trains and buses, aircrafts, ships, houses, factories and the like. The coated flame-retardant tape is known. However, although the PVC-based flame-retardant base material is flame-retardant,
PVC-based flame-retardant base material is heavy and has the problem of toxicity due to residual vinyl chloride monomer and plasticizer, not only lacking flexibility after many years of use, but also generating toxic gas during combustion. Therefore, in recent years, there has been a demand for a light-weight material that can be used stably for a long period of time without the problem of toxicity that substitutes for these flame-retardant base materials. Although it is possible to reduce the weight by using a polyolefin instead of the above PVC, the polyolefin alone is easily flammable, and it is lightweight when a resin composition containing an organic flame retardant such as a halogen-based flame retardant is used in the polyolefin. However, like the PVC, organic flame retardants such as halogen flame retardants have a problem of generating toxic gas during combustion. Therefore, it is lightweight that solves these problems and there are no safety issues.
There is a demand for development of a polyolefin-based flame-retardant base material having excellent strength that can be used stably for a long period of time.

[0003]

DISCLOSURE OF THE INVENTION Mechanical strength, electrical characteristics, flexibility, moldability, etc. are excellent, and a halogen-free, pollution-free, high-level difficulty that does not generate toxic gas such as halogen gas during combustion. It was an object to provide a flame-retardant polyolefin-based flame-retardant tape.

[0004]

DISCLOSURE OF THE INVENTION In view of the above points, the present invention has made extensive studies, and as a result, a tape composition is prepared by using a resin composition comprising a polyolefin resin or a polyolefin resin containing a specific reactive compound and an inorganic flame retardant. The present invention has been completed by finding that the above problems can be solved by forming a material and forming a flame-retardant tape having an adhesive substance layer formed thereon. A first invention of the present invention is a flame-retardant pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer provided on a surface of a substrate made of a polyolefin resin composition containing the following (A) and (B). Polyolefin resin composition: (A) Polyolefin resin (A1) or a1: carboxylic acid group, carboxylic acid ester group or acid anhydride group-containing monomer, a2: epoxy group-containing monomer, a3: hydroxyl group-containing monomer, a4: amino Group-containing monomer, a
5: alkenyl cyclic iminoether derivative, a6: polyfunctional monomer, a7: unsaturated organic titanate compound, a8: a polyolefin resin (A2) containing at least one reactive compound selected from unsaturated organic silane compounds, or its 100 parts by weight of resin composition, and (B) inorganic flame retardant 30 to 200 parts by weight

The polyolefin resin (A1) which is the component (A) of the present invention includes ultra low density polyethylene, high pressure low density polyethylene, linear low density polyethylene,
Medium density polyethylene, high density polyethylene, ethylene-
Olefin rubber such as propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, ethylene-butene-1 copolymer rubber, ethylene-vinyl ester copolymer such as ethylene-vinyl acetate copolymer, ethylene-
Ethylene-based (co) polymers such as copolymers with ethylene-α, β-carboxylic acid or its derivatives such as (meth) acrylic acid alkyl ester copolymers, polypropylene,
Examples thereof include polypropylene-based polymers such as propylene-ethylene copolymers and polybutene-based polymers. Among these, ultra low density polyethylene (VLDPE), high pressure method low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and other ethylene (co) polymers having a density of 0.86 to 0.94 g / cm ³ , ethylene- Ethylene such as propylene copolymer rubber (EPR), ethylene-propylene-diene copolymer rubber (EPDM), ethylene-butene-1 copolymer rubber, ethylene-vinyl acetate copolymer (EVA), etc. A soft polyolefin polymer such as a copolymer with an ethylene-α, β-carboxylic acid or a derivative thereof such as a vinyl ester copolymer and an ethylene- (meth) acrylic acid alkyl ester copolymer The composition or mixture is preferable from the viewpoint of acceptability and compatibility with flame retardants and fillers.

The above-mentioned ultra low density polyethylene (VLDPE)
Means polyethylene having a density of 0.86 to 0.910 g / cm ³ and exhibiting an intermediate property between the linear low-density polyethylene and the ethylene-α-olefin copolymer rubber. For example, density 0.860 to 0.910 g / cm ³ , differential scanning calorimetry (D
SC) is a specific ethylene-α-olefin copolymer having a maximum peak temperature (Tm) of 60 ° C. or higher, and preferably having a boiling n-hexane insoluble content of 10% by weight or higher, at least titanium and / or vanadium. A resin which is polymerized using a catalyst composed of a solid catalyst component and an organoaluminum compound contained therein, and which has a high crystalline portion represented by a linear low-density polyethylene and an amorphous portion represented by an ethylene-α-olefin copolymer rubber. However, the former characteristics such as mechanical strength and heat resistance, and the latter characteristics such as rubber-like elasticity and low temperature impact resistance coexist in a well-balanced manner, and are extremely useful when used in the present invention. .. The α
Examples of olefins include propylene, butene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1, dodecene-1.

As the olefin rubber of the present invention, ethylene-propylene-diene random copolymer rubber and ethylene-propylene random copolymer rubber are particularly preferable. These two rubbers are superior in thermoplasticity to other rubber-like substances and are easy to disperse by melt-kneading.
Compared with R, isoprene rubber, nitrile rubber, butadiene rubber, etc., it has no unique odor or is available in pellet form, so it is easy to measure and handle when compounding, and the type of composition manufacturing equipment Also, regarding the above, there is an operational advantage such as a high degree of freedom in selection. Regarding the diene component of the above ethylene-propylene-diene random copolymer rubber, ethylidene norbornene, dicyclopentadiene, 1,4-
Any of cyclohexadiene and the like can be used. The Mooney viscosity (ML1 + 4 100 ° C) of these rubbery substances is 10
˜100, preferably (ML1 + 4100 ° C.) in the range of 20-90. If a Mooney viscosity (ML1 + 4 100 ° C) of 10 or less is used, almost no effect of improving impact resistance can be obtained. This may result in poor dispersion with the combustion agent.

The propylene-based or butene-based soft polyolefin of the present invention is a propylene-α-olefin random copolymer or butene-1-α-olefin random copolymer produced by using a Ziegler-based catalyst and has low crystallinity. To non-crystalline polyolefin.

Further, in the present invention, isobutene rubber, butadiene rubber, 1,2-polybutadiene rubber, styrene-butadiene random copolymer rubber, chloroprene rubber, nitrile rubber, styrene-butadiene-styrene block copolymer rubber, styrene- You may add and use isoprene-styrene block copolymer rubber.

The ethylene-vinyl ester copolymer of the present invention comprises vinyl propionate, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate and stearic acid, which are produced by a high pressure radical polymerization method and contain ethylene as a main component. It is a copolymer with vinyl ester monomers such as vinyl and vinyl trifluoroacetate. Among these, vinyl acetate is particularly preferable. That is, a copolymer composed of 50 to 99.5% by weight of ethylene, 0.5 to 50% by weight of a vinyl ester, and 0 to 49.5% by weight of another copolymerizable unsaturated monomer is preferable.

The copolymer of the present invention with the ethylene-α, β-unsaturated carboxylic acid or its derivative includes ethylene-α, β-unsaturated carboxylic acid copolymer, ethylene-α,
Examples thereof include β-unsaturated carboxylic acid ester copolymers, metal salts, amides, and imides thereof, preferably 50 to 99.5% by weight of ethylene produced by a high-pressure radical polymerization method, α, β-unsaturated. Carboxylic acid or ester
Copolymers consisting of 5 to 50% by weight and 0 to 49.5% by weight of other copolymerizable unsaturated monomers are preferred.

Specific examples of the above α, β-unsaturated carboxylic acid or ester include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, maleic anhydride and itaconic anhydride, and acrylic. Methyl acid,
Methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate,
Isopropyl acrylate, isopropyl methacrylate,
-N-butyl acrylate, -n-butyl methacrylate,
Cyclohexyl acrylate, cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, maleic acid monomethyl ester, maleic acid monoethyl ester, maleic acid diethyl ester, fumaric acid monomethyl ester, glycidyl acrylate, methacrylic acid Examples thereof include unsaturated carboxylic acid esters such as glycidyl acid salt. Among these, (meth) acrylic acid alkyl ester is particularly preferable. More preferably, ethyl acrylate can be mentioned.

Examples of the metal salt include sodium salt, potassium salt, calcium salt, lithium salt, aluminum salt, magnesium salt, zinc salt and the like.

Specific examples of the above copolymers include ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid-ethyl acrylate copolymer. , Ethylene-
Vinyl acetate copolymer, ethylene-vinyl acetate-ethyl acrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate-ethyl acrylate copolymer and the like or their metal salts (ionomer) Can be mentioned. You may mix and use these copolymers. In particular, an oxygen-containing soft polyolefin resin such as an ethylene-vinyl ester copolymer or a copolymer with ethylene-α, β-carboxylic acid or a derivative thereof is preferable because the synergistic effect of flame retardancy is remarkable. The reason why the oxygen-containing soft polyolefin resin exhibits high flame retardancy when an inorganic flame retardant is blended is not clear, but it is considered to be due to a synergistic effect with the inorganic flame retardant during combustion.

The polyolefin resin composition containing the reactive compound of the present invention means a1: a carboxylic acid group, a carboxylic acid ester group or an acid anhydride group-containing monomer, a2: an epoxy group-containing monomer, a3: a hydroxyl group-containing monomer, a4: Amino group-containing monomer, e: Alkenyl cyclic iminoether derivative, a5: Polyfunctional monomer, a7: Unsaturated organic titanate compound, a8: Polyolefin containing at least one reactive group selected from unsaturated organic silane compound -Based resin (A2) or its resin composition 100
And a resin composition containing 30 to 200 parts by weight of the inorganic flame retardant (B).

The polyolefin resin containing a reactive group of the present invention is a binary or multi-component copolymer of an olefin and at least one of the above monomers, or a graft obtained by graft-modifying at least one of the above monomers on the polyolefin resin. The modified product includes a thermoplastic resin composition in which a polyolefin resin is impregnated with at least one kind of the monomer. However, the modified product is a graft-modified product because the method is simple, effective, and inexpensive. Is most preferred.

The above-mentioned reactive group a1: carboxylic acid group, carboxylic acid ester group or acid anhydride group-containing monomer means α, such as maleic acid, fumaric acid, citraconic acid or itaconic acid.
β-unsaturated dicarboxylic acid, acrylic acid, methacrylic acid,
Examples thereof include unsaturated monocarboxylic acids such as furanic acid, crotonic acid, vinylacetic acid, and pentenoic acid, and esters or anhydrides of these α, β-unsaturated dicarboxylic acids or unsaturated monocarboxylic acids.

A2: As the epoxy group-containing monomer,
Glycidyl acrylate, glycidyl methacrylate, itaconic acid monoglycidyl ester, butene tricarboxylic acid monoglycidyl ester, butene tricarboxylic acid diglycidyl ester, butene tricarboxylic acid triglycidyl ester and α-chloroallyl, maleic acid, crotonic acid, fumaric acid, etc. Glycidyl esters or vinyl glycidyl ether, allyl glycidyl ether, glycidyl oxyethyl vinyl ether, styrene-p-
Glycidyl ethers such as glycidyl ether, p-
Examples thereof include glycidyl styrene, and particularly preferable examples include glycidyl methacrylate and allyl glycidyl ether.

A3: 1-hydroxypropyl (meth) acrylate as the hydroxyl group-containing monomer, 2
-Hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate and the like can be mentioned.

A4: Examples of the amino group-containing monomer include tertiary amino group-containing monomers such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate and dibutylaminoethyl (meth) acrylate.

A5: The alkenyl cyclic iminoether derivative is represented by the following structural formula:

[Chemical 1] [Where n is 1, 2 and 3, preferably 2 and 3, and more preferably 2]. In addition, R ¹ , R ² , R ³ ,
Each R represents a C1 to C12 inactive alkyl group and / or hydrogen, and each alkyl group may have an inactive substituent.] Inert as used herein means a function of a graft reaction or a product thereof. It means that it does not adversely affect. Also, all R need not be the same. Preferably R ¹ = R ² = H, R ³
= H or Me, R = H, that is, 2-vinyl and /
Or 2-isopropenyl-2-oxazoline, 2-vinyl and / or 2-isopropenyl-5,6-dihydro-4H-1,3-oxazine. These may be used alone or as a mixture. Among these, 2-vinyl and / or 2-isopropenyl-2-oxazoline are particularly preferable.

A6: As the polyfunctional monomer, polyfunctional methacrylate monomers represented by trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, etc., divinylbenzene, triallyl isocyanurate,
Polyfunctional vinyl monomers typified by diallyl phthalate and vinyl butyrate, N, N'-m-phenylene bismaleimide, bismaleimides typified by N, N'-ethylene bismaleimide, P-quinone dioxime And other dioximes.

A7: Examples of unsaturated titanate compounds include tetraisopropyl titanate, tetra-n-butyl titanate, tetrakis (2-ethylhexoxy) titanate, and titanium lactate ammonium salt.

A8: Examples of unsaturated silane compounds include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetylsilane and vinyltrichlorosilane.

When at least one of the above monomers is graft-modified with a polyolefin resin, it is preferably carried out in the presence of a cross-linking agent without solvent or in a solvent. As the cross-linking agent, hydroperoxide, dialkyl peroxide, diacyl peroxide, peroxy ester,
At least one selected from organic peroxides such as ketone peroxides, dicumyl compounds, dihydroaromatic compounds, and vulcanizing agents such as sulfur.

The polyolefin resin to be graft modified is not particularly limited. For example, in the case of preparing a composition in which the polyolefin resin containing a reactive group alone is mixed with an inorganic flame retardant, it is preferable that the polyolefin resin containing a reactive group is essentially a soft polyolefin resin. .. Further, in the case of blending a resin composition blended with a polyolefin resin containing a reactive group and another soft polyolefin resin and an inorganic flame retardant, the polyolefin resin containing a reactive group is not necessarily a soft polyolefin resin. Need not be composed of, and may be composed of a resin having high crystallinity such as high / medium density polyethylene, polypropylene, etc.
0.97 g / cm ³ of ethylene-α-olefin copolymer is preferably used.

The reaction or graft amount of the above reactive group is
It is used in an amount of 0.01 to 20% by weight, preferably 0.1 to 15% by weight, based on the resin component. The soft polyolefin resin used for the modification of the present invention or the soft polyolefin resin blended with the polyolefin resin containing a reactive group is appropriately selected from at least one of the above polyolefin resins (A1).

As the inorganic flame retardant of the component (B) of the present invention, aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, basic magnesium carbonate, dolomite,
Hydrotalcite, calcium hydroxide, barium hydroxide, hydrate of tin oxide, hydrate of inorganic metal compounds such as borax, zinc borate, zinc metaborate, barium metaborate, zinc carbonate, magnesium carbonate-calcium carbonate, Examples thereof include calcium carbonate, barium carbonate, magnesium oxide, molybdenum oxide, zirconium oxide, tin oxide, antimony oxide and red phosphorus. These may be used alone or in combination of two or more. Among them, at least one selected from the group consisting of magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate and hydrotalcite is particularly preferable.
The seed has a good flame retardant effect and is economically advantageous.

In order to promote char (carbonized layer), inorganic metal hydrates such as aluminum hydroxide and magnesium hydroxide are coated with red phosphorus or phenol resin and / or heavy metal. Red phosphorus, carbon black, boric acid It is preferable to use it in combination with at least one kind of a silicon compound such as salt, silicone oil or silicone rubber.
It is desirable to add the above char-forming aid such as red phosphorus in the range of about 0.5 to 20% by weight with respect to the inorganic flame retardant. Although the particle size of these inorganic flame retardants varies depending on the type, in magnesium hydroxide, aluminum hydroxide and the like, the average particle size is preferably 20 μm or less.

The amount of the above inorganic flame retardant compounded is the resin component 10
30 to 200 parts by weight, preferably 50 to 0 parts by weight
˜150 parts by weight. If the amount of the flame retardant is less than 30 parts by weight, the combustion effect is small, and if it exceeds 200 parts by weight, the mechanical strength and elongation are reduced, the flexibility is lost and the composition becomes brittle, and the low temperature characteristics are deteriorated.

Further, in the present invention, by using the inorganic filler and the flame retardant in combination, the addition amount of the flame retardant can be reduced and other characteristics can be imparted. Examples of the inorganic filler used in the present invention include powder, a flat plate,
Needle-like, spherical or hollow and fibrous, and the like, specifically, calcium carbonate, magnesium carbonate, calcium sulfate, calcium silicate, clay, diatomaceous earth, talc,
Alumina, silica sand, glass powder, iron oxide, metal powder, antimony trioxide, graphite, silicon carbide, silicon nitride, silica, boron nitride, aluminum nitride, carbon black and other powdery and granular fillers, mica, glass plate, sericite, Pyrophyllite, metal flakes such as aluminum flakes, flat or scale-like fillers such as graphite, hollow fillers such as shirasu balloon and pumice, glass fibers, carbon fibers, graphite fibers, whiskers, metal fibers, silicone carbide Examples include fibers, asbestos, and mineral fibers such as wollastonite.

These addition amounts are applied up to about 100 parts by weight with respect to 100 parts by weight of the resin component. If the addition amount exceeds 100 parts by weight, mechanical strength such as impact strength of the base material is lowered, which is not preferable.

In the present invention, when the above-mentioned inorganic flame retardant or inorganic filler is used, the flame retardant or filler is a fatty acid such as stearic acid, oleic acid or palmitic acid or a metal salt thereof, paraffin wax or polyethylene wax. Alternatively, it is preferable to perform surface treatment such as coating with a modified product thereof, organic borane or the like.

A scratch-whitening inhibitor may be added to the resin composition used in the present invention within a range not impairing its properties. As the scratch whitening agent, mineral oil, wax, paraffins, higher fatty acids and their esters,
Amide or metal salt, silicone, partial fatty acid ester of polyhydric alcohol or at least one of fatty acid alcohol, fatty acid, fatty acid amino, fatty acid amide, alkylphenol or alkylnaphthol alkylene oxide adduct. Among the above-mentioned scratch whitening agents, silicone such as oleic acid amide, stearic acid amide, higher fatty acid amide and higher fatty acid modified silicone oil is preferable, and higher fatty acid amide is economically advantageous because it is inexpensive.

In the present invention, organic fillers, antioxidants, lubricants, organic or inorganic pigments, UV inhibitors, dispersants, and copper damage are used within the range not impairing the physical properties of the resin composition and depending on the purpose of use. An inhibitor, a neutralizing agent, a plasticizer, a nucleating agent, a pigment, a modified wax and the like may be added.

To produce the base material for the flame-retardant pressure-sensitive adhesive tape of the present invention, first, a polyolefin resin or a polyolefin resin containing a reactive group, an inorganic flame retardant, and if necessary, an inorganic filler, an additive, etc. And dry blend them with an ordinary tumbler, or melt-knead them with an ordinary kneader such as a Banbury mixer, pressure kneader, kneading extruder, twin-screw extruder, or roll to disperse them evenly. After producing a substrate by a known melt pressing method, a melt extrusion method or the like, the adhesive substance is applied, or at the same time when the substrate is produced, application of an adhesive substance, spraying,
The adhesive substance layer may be provided by a method such as laminating. The thickness, width, length, etc. of the flame-retardant adhesive tape are not particularly limited as long as they can be used as a tape. The long product may be manufactured and then appropriately cut, or the long product may be appropriately cut and then made into a predetermined size according to the purpose of use, or a product having a specific size may be prepared from the beginning.

A base material having excellent abrasion resistance and heat resistance may be laminated on the surface opposite to the adhesive substance layer of the flame-retardant adhesive tape of the present invention, and if a foam or the like is laminated, cushioning properties may be obtained. It can also be given.

The surface of the substrate used in the present invention may be grafted with radiation to improve the support of the adhesive substance.

The base material used in the present invention is hard-coated with a silicone resin, a metal oxide or the like to prevent scratches,
The surface of the tape opposite to the adhesive substance layer may be coated with wax or the like to make it difficult to adhere to the adhesive substance layer.

The adhesive substance used in the present invention comprises an adhesive polymer, a tackifying substance, a solvent, etc., and all existing adhesive substances such as rubber type and emulsion type are used as long as the insulating effect is not impaired. It can be used and is not particularly limited.

Examples of the tackifying polymer used in the present invention include natural rubber, recycled rubber, silicone rubber, isoprene rubber, styrene butadiene rubber, polyisobutylene, NBR, polyvinyl ether, polyacrylic ester, styrene isoprene or styrene isoprene butadiene block copolymer. , Acrylic acid ester acrylic acid amide copolymer and the like. Examples of the tackifier used in the present invention include polyterpenes, rosins and their derivatives,
Examples thereof include oil-soluble phenol resin, coumarone indene resin, petroleum hydrocarbon resin and the like.

A softening agent, a filler, an antiaging agent, an emulsion stabilizer, a thickener, and a defoaming agent can be added to the adhesive substance used in the present invention depending on the use and the resin. Further, a commercial value can be increased by adding a metal antioxidant or the like to these adhesive substances as long as the adhesiveness is not impaired.

The present invention includes the following embodiments, but the present invention is not limited to these embodiments. (1) The polyolefin resin (A1) is ultra-low density polyethylene, ethylene-vinyl ester copolymer, ethylene-α, β-unsaturated carboxylic acid or its ester copolymer and its metal salt, olefin rubber, propylene The flame-retardant pressure-sensitive adhesive tape according to claim 1, which is at least one selected from the group consisting of an ethylene random copolymer and a propylene-butene-1 random copolymer. (2) The polyolefin resin (A2) is ethylene-
α-olefin copolymer (density 0.910 to 0.970 g
/ Cm ³ ), ultra-low density polyethylene, and at least one acid-modified polyolefin-based resin selected from the group consisting of ethylene-vinyl ester copolymers.
Flame-retardant adhesive tape described in. (3) The flame-retardant pressure-sensitive adhesive tape according to claim 1, wherein the inorganic flame retardant is a hydrate of an inorganic metal compound. (4) The flame-retardant pressure-sensitive adhesive tape according to claim 1, wherein the hydrate of the inorganic metal compound is magnesium hydroxide and / or aluminum hydroxide.

[0044]

EXAMPLES The present invention will be described in detail below with reference to examples, but the invention is not limited to these examples without departing from the gist of the invention. [Resin and material used] Polyolefin resin as component (A): A1-1: ethylene-α-olefin copolymer [MFR
= 5 g / 10 min, density = 0.905 g / cm ³ , trade name; Nisseki Softlex D9550 manufactured by Nippon Petrochemical Co., Ltd.] A1-2: ethylene-ethyl acrylate copolymer (E
EA) [EA content = 15% by weight, MFR = 0.75 g
/ 10 min, trade name; Nisseki Lexron A1150 manufactured by Nippon Petrochemical Co., Ltd.] A1-3 ethylene-vinyl acetate copolymer (EVA)
[MFR = 1.5 g / 10 min, trade name; Nisseki Lexron V270, manufactured by Nippon Petrochemical Co., Ltd.] A2-1: acid-modified polyolefin [trade name: Nisseki N Polymer L6031, manufactured by Nippon Petrochemical Co., Ltd.] A2- 2: Alkenyl cyclic imino ether derivative A2-3: Epoxy group-containing monomer [trade name; Nisseki Lexpearl RA3150 manufactured by Nippon Petrochemical Co., Ltd.]

(B) Inorganic flame retardant: B-1 Magnesium hydroxide [Mg (OH) ₂ , trade name; Kisuma 5B Kyowa Chemical Co., Ltd.] B-2 Red phosphorus [trade name; HISHIGARD NP-10 Nihon Kagaku Kogyo Co., Ltd.] [Sample preparation method] A and B components were dry blended in predetermined amounts, and kneaded with a 50 mmΦ extruder to form pellets. This composition is formed into a sheet having a predetermined thickness by a press and M
FR and oxygen index were measured. Further, a tape having a thickness of 0.2 mm was prepared by a T-die molding machine, and a commercially available rubber-based adhesive substance was applied to the surface to obtain an adhesive tape. The tensile test and volume resistivity of this adhesive tape were measured. The results are also shown in Table 1. The oxygen index was measured according to JIS K7201.

[0046]

[Table 1]

[0047]

As described above, according to the present invention, a polyolefin resin or a polyolefin resin containing a specific reactive compound, particularly preferably a soft or oxygen-containing soft polyolefin resin is used, and an inorganic flame retardant is mixed therein. By forming a base material using a resin composition and providing an adhesive substance layer on top of it, it imparts a high degree of flame retardancy and is excellent in mechanical strength, electrical characteristics, flexibility, molding processability, etc. It can be a flame-retardant adhesive tape. In addition, by coupling a polyolefin resin having a specific reactive group with an inorganic flame retardant, dripping does not occur during combustion, and processability, flexibility, mechanical properties, electrical properties, etc. are leap forward. It is conceivable that the halogen-free, pollution-free, high-level flame retardancy that does not cause a safety problem can be imparted. The flame-retardant pressure-sensitive adhesive tape of the present invention having such excellent properties can be used for various vehicles including vehicles such as automobiles, trains and buses, ships, aircraft, general houses, and the Nuclear Research Institute that regulates the amount of corrosive gas. Insulation tape for electric power plants, chemical plants, steel plants, petroleum plants, and electrical equipment used in places where high flame retardancy is required, such as in the fields of textile, electricity, electronics, construction, civil engineering, etc. It can be used as, and its industrial utility value is great.

Claims (1)

[Claims] 1. A flame-retardant pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer provided on the surface of a substrate made of a polyolefin resin composition containing the following (A) and (B). Polyolefin resin composition: (A) Polyolefin resin (A1) or a1: carboxylic acid group, carboxylic acid ester group or acid anhydride group-containing monomer, a2: epoxy group-containing monomer, a3: hydroxyl group-containing monomer, a4: amino Group-containing monomer, a
5: alkenyl cyclic iminoether derivative, a6: polyfunctional monomer, a7: unsaturated organic titanate compound, a8: a polyolefin resin (A2) containing at least one reactive compound selected from unsaturated organic silane compounds, or its 100 parts by weight of resin composition, and (B) inorganic flame retardant 30 to 200 parts by weight