JPH05345882A - Flame retardant tape - Google Patents

Abstract

PURPOSE:To obtain a tape excellent in flame retardance and free from occurrence of poisonous gas in burning by applying a tacky substance to a substrate obtained by rolling a composition containing a polyolefin based resin which may contain a specific reactive compound and an inorganic flame retardant. CONSTITUTION:The flame retardant tape utilizable for insulating tape, etc., is obtained by applying a tacky substance to a substrate obtained by rolling a resin composition containing (A) 100 pts.wt. polyolefin based resin (e.g. low density polyethylene) or polyolefin based resin containing one or more kinds of reactive compounds of a carboxylic acid group-, a carboxylic acid ester group- or an acid anhydride group-containing monomer, an epoxy group- containing monomer, a hydroxyl group-containing monomer, an amino group- containing monomer, an alkenyl cyclic imino ether derivative, a multifunctional monomer, an unsaturated organic titanate compound, an unsaturated organic silane compound, etc., (e.g. ethylene-acrylic acid ethyl ester copolymer) or its resin mixture and (B) 30-200 pts.wt. inorganic flame retardant (e.g. magnesium hydroxide).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a substrate 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. The present invention relates to a flame-retardant tape characterized by being applied, and more specifically,
In addition to having a high degree of flame retardance, it does not generate toxic gases such as halogen gas during combustion, and is excellent in safety, flexibility, mechanical properties, chemical resistance, electrical properties, etc.
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 automobiles, 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,
Since it has a higher specific gravity than PVC-based flame-retardant base material polyolefin, it becomes heavier, and there is a problem of toxicity due to residual vinyl chloride monomer and a plasticizer, and it loses flexibility when used for many years. Since it has problems such as generation of poisonous gas, in recent years, there is no problem of toxicity replacing these flame-retardant base materials, and it is possible to substitute for those that are lightweight and can be used stably for a long period of time. It is being requested. It is possible to reduce the weight by using polyolefin instead of PVC, but 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. Of PVC and flame retardancy can be achieved,
Similar to the above, organic flame retardants such as halogen flame retardants generate toxic gas during combustion. Therefore, there is a demand for the development of a polyolefin-based flame-retardant base material that solves these problems and that has no safety problems and that is lightweight and that can be used stably for a long period of time and has excellent strength.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made through intensive studies in view of the above points, and is a resin comprising a polyolefin resin or a polyolefin resin containing a specific reactive compound and an inorganic flame retardant. By using a flame-retardant tape in which an adhesive material is applied to a stretched base material, mechanical strength in the longitudinal direction, electrical characteristics, flexibility, molding processability, etc. are excellent, and halogen gas during combustion is used. It is intended to provide a halogen-free, pollution-free, high-flame-retardant polyolefin-based flame-retardant tape that does not generate toxic gases such as.

[0004]

The first invention of the present invention is characterized in that an adhesive substance is applied to a base material obtained by stretching a polyolefin resin composition containing the following (A) and (B). It is a flame-retardant tape. 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 the above 100 parts by weight of resin mixture, 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 and ethylene-propylene. Olefin rubber such as 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 (DS
C) 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 + 4 100 ° C.) in the range of 20-90. When 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, nitrile rubber,
Styrene-butadiene-styrene block copolymer rubber, styrene-isoprene-styrene block copolymer rubber, etc. may be added and used.

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. Among these, vinyl acetate is particularly preferable. That is, ethylene 5
0-99.5% by weight, vinyl ester 0.5-50% by weight, other copolymerizable unsaturated monomer 0-49.5% by weight
Copolymers consisting of are preferred.

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.

The metal salt of the ethylene-α, β-unsaturated carboxylic acid- (unsaturated carboxylic acid ester) copolymer of the present invention includes sodium salt, potassium salt, calcium salt, lithium salt, aluminum salt, magnesium salt, Examples thereof include zinc salts.

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.

Oxygen-containing soft polyolefin resins such as ethylene-vinyl ester copolymers and copolymers with ethylene-α, β-carboxylic acid or its derivatives are particularly preferable because they have a remarkable flame retardant synergistic effect. 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 containing the reactive compound of the present invention means an olefin and a1: a carboxylic acid group, a carboxylic acid ester group or an acid anhydride group-containing monomer, a2:
Epoxy group-containing monomer, a3: hydroxyl group-containing monomer, a4: amino group-containing monomer, e: alkenyl cyclic iminoether derivative, a5: polyfunctional monomer, a
7: Unsaturated organic titanate compound, a8: Binary or multi-component copolymer with at least one reactive compound selected from unsaturated organic silane compounds, graft modified product obtained by graft modification of one compound, and polyolefin resin Although it includes a thermoplastic resin composition impregnated with at least one of the monomers, the graft modified product is most preferable because it is a simple and effective operation and is an inexpensive method.

The above-mentioned reactive compound a1: a carboxylic acid group, a carboxylic acid ester group or an acid anhydride group-containing monomer, is α, β-unsaturated dicarboxylic acid such as maleic acid, fumaric acid, citraconic acid or itaconic acid, acrylic acid. , Unsaturated carboxylic acids such as methacrylic acid, furanic acid, crotonic acid, vinylacetic acid, pentenoic acid, etc., or α, β-
Mention may be made of esters or anhydrides of 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:

[0022]

[Chemical 1]

[Where n is 1, 2 and 3, preferably 2 and 3, and more preferably 2]. Also R ¹ , R
² , R ³ and R each represent an inactive C1 to C12 alkyl group and / or hydrogen, and the alkyl group may have an inactive substituent.] Inert as used herein means a graft reaction or It means that the function of the product is not adversely affected. Also, all R need not be the same. Preferably R ¹ = R ² = H, R ³ = H or M
e, R = H, that is, 2-vinyl and / or 2-isopropenyl-2-oxazoline, 2-vinyl and / or 2-isopropenyl-5,6-dihydro-4H-1,
It is 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 typified by trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, 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 the polyolefin resin is graft-modified with at least one of the above reactive compounds, it is preferably carried out in the presence of a cross-linking agent without solvent or in a solvent.
Examples of the crosslinking agent include at least one selected from hydroperoxides, dialkyl peroxides, diacyl peroxides, peroxyesters, organic peroxides such as ketone peroxides, dicumyl compounds, dihydroaromatic compounds, and vulcanizing agents such as sulfur. Be done.

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 the reactive compound alone is mixed with an inorganic flame retardant, the polyolefin resin containing the reactive compound may be essentially a soft polyolefin resin. preferable. Further, in the case of blending the resin composition blended with the polyolefin resin containing the reactive compound and the other soft polyolefin resin and the inorganic flame retardant, the polyolefin resin containing the reactive compound is not necessarily the soft polyolefin resin. It is not necessary to form the resin with a high crystallinity resin such as high / medium density polyethylene or polypropylene. In particular, an ethylene-α-olefin copolymer having a density of 0.91 to 0.97 g / cm ³ is used. Preferably used.

The amount of reaction or grafting of the above reactive compound is 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 compound is appropriately selected from at least one of the above polyolefin resins (A1).

The inorganic flame retardant of the component (B) of the present invention includes 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.

Further, in order to promote char (carbonized layer), inorganic metal hydrate such as aluminum hydroxide or magnesium hydroxide and red phosphorus or phenol resin and / or heavy metal coated red phosphorus, carbon black, boric acid are coated. 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, not only stretching becomes impossible, but also the mechanical strength and elongation decrease, the flexibility is lost and the material becomes brittle, and The low temperature characteristics also deteriorate.

The present invention is characterized in that a sheet made of a polyolefin resin composition containing the component (A) and the component (B) is subjected to a stretching treatment. The stretching treatment improves mechanical strength such as tensile strength. In addition, the workability at the time of winding is greatly improved by reducing the elongation.

In the present invention, the addition amount of the flame retardant can be reduced and other characteristics can be imparted by using the inorganic filler and the flame retardant together. 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. You may add an inhibitor, a neutralizer, a plasticizer, a nucleating agent, a pigment, etc.

For the tape base material of the present invention, the above resin composition must be finally drawn. Stretching in the present invention means to stretch by softening and stretching the resin composition, such as uniaxial stretching, biaxial stretching and the like, all stretching methods can be used, but there is little change in the width in the lateral direction, the resin composition Proximity stretching is the best, since the orientation of the polymer within is preferred. To stretch the resin composition of the present invention, the melt-kneaded resin composition may be stretched as it is, but once,
It is preferable to stretch it after processing it into a sheet or film.
Further, in the present invention, it is fundamental to stretch the tape in the longitudinal direction, but unless the mechanical properties of the tape are adversely affected, the stretching of the tape in the lateral direction and the auxiliary rolling are not excluded. ..

To give an example of the above-mentioned stretching, a film, sheet or the like extruded by an extruder or gear pump is
The temperature is adjusted to 140 degrees, preferably 60 to 110 degrees. At this time, if the heating temperature is less than 50 ° C., it does not sufficiently soften, and if it exceeds 140 ° C., rapid molding is possible, but sufficient mechanical properties cannot be provided. This adjusting method is arbitrary, and it may be stretched as it is if the film or sheet to be stretched or heated by blowing hot air, heating with a medium, heating with an oven, or the like is at the above temperature. If heating is performed, it is desirable to perform it continuously. The heating portion may be appropriately selected according to the purpose such as total heating, partial heating, and single-sided heating.

The stretching ratio is 1.2 to 9 times, preferably 1.5 to 5 times. The reason for this is that if it is less than 1.2 times, the effect of stretching is not obtained, and if it exceeds 9 times, microvoids are generated at the temperature at which molding is possible and physical properties are reduced, there is a problem such as clouding, or it becomes stiff and flexible. This is because there is no sex. Further, in some cases, a problem of tearing may occur.

The above draw ratio is represented by the ratio of the take-up speeds of the first godet roll and the final godet roll. Normally, the final godet roll take-up speed is 10-
It is desirable to adjust to 200 m / min. The base material for tape may be stretched and then left as it is, but it is preferable to reheat it to remove internal strain. Generally, it is desirable to reheat at a temperature lower than the stretching temperature by 3 to 20 degrees. This reheating is normally performed in a relaxed state by continuously passing through a heating bath, but in some cases, the second stretching may be performed by applying a temperature higher than the stretching temperature. The thickness of the tape base material of the present invention is preferably about 0.001 to 1 mm.

In order to produce the base material for the flame-retardant tape of the present invention, first, a polyolefin resin containing a reactive compound,
Inorganic flame retardant, if necessary inorganic filler, additives and the like are blended, and these are made by dry blending with an ordinary tumbler, or a Banbury mixer, a pressure kneader, a kneading extruder, a twin-screw extruder, After melt-kneading with a normal kneader such as a roll and uniformly dispersing the mixture, a sheet formed by a known melt-pressing method, a melt-extruding method or the like is stretched as described above to produce a base material, and then an adhesive is applied. The adhesive may be applied, or the pressure-sensitive adhesive may be applied simultaneously with the production of the substrate. The thickness, width, length, etc. of the flame-retardant tape are not particularly limited as long as they can be used as a tape. After manufacturing a long product, cut it appropriately into a tape shape, or cut a long product into a predetermined size according to the purpose of use, or make a specific size from the beginning. Good.

A base material having excellent wear resistance and heat resistance may be laminated on the surface of the flame-retardant tape of the present invention opposite to the adhesive.
Moreover, cushioning properties can be imparted by laminating a foam or the like.

The surface of the base material of the present invention may be grafted with radiation to improve the support of the pressure-sensitive adhesive.

The base material of the present invention is hard-coated with a silicone resin or a metal oxide to prevent scratches, and the surface of the tape opposite to the adhesive is coated with wax to make it difficult to adhere to the adhesive. Good.

As the pressure-sensitive adhesive of the present invention, all existing pressure-sensitive adhesives such as rubber type and emulsion type can be used as long as they do not impair the insulating effect, and are not particularly limited.

Examples of the adhesive polymer 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, and acrylic. Examples include acid ester acrylic acid amide copolymers. Examples of tackifiers include polyterpenes, rosins and their derivatives, oil-soluble phenol resins, coumarone indene resins, petroleum hydrocarbon resins and the like.

The adhesive may be a softening agent depending on the application and resin,
Fillers, anti-aging agents, emulsion stabilizers, thickeners and defoamers can be added. Further, as long as the adhesiveness is not impaired, a metallic antioxidant or the like may be added to increase the commercial value.

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, polyolefin rubber, propylene The flame-retardant 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 flame-retardant tape according to claim 2, wherein the inorganic flame retardant is a hydrate of an inorganic metal compound. (3) The flame-retardant tape according to claim 3, wherein the hydrate of the inorganic metal compound is magnesium hydroxide and / or aluminum hydroxide. (4) In addition to the hydrate of the inorganic metal compound being magnesium hydroxide and / or aluminum hydroxide, an ethylene-α-olefin copolymer modified with maleic anhydride, citraconic acid anhydride, and phthalic anhydride, The flame-retardant tape according to claim 1, wherein at least one kind of low-density polyethylene, ethylene-vinyl ester copolymer, and ethylene wax is added to the polyolefin.

[0051]

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 materials used] Polyolefin resin of component (A): A1-1: ethylene-ethyl acrylate copolymer (E
EA) [EA content = 15% by weight, MFR = 0.75 g
/ 10 min, density 0.933 g / cm ³ ] A1-2 ethylene-vinyl acetate copolymer (EVA)
[VA content = 15% by weight, MFR = 1.5 g / 10
Min, density of 0.938g / cm ^3] A1-3: low-density polyethylene (LDPE) [MFR
= 1.0 g / 10 minutes, density 0.920 g / cm ³ Trade name; Nisseki Lexron W2000 Nippon Petrochemical Co., Ltd.
Made] A1-4: ethylene propylene copolymer rubber (EPR)
[Moonie viscosity 40 (100 ° C), trade name; JSRE1
1 manufactured by Nippon Synthetic Rubber Co., Ltd.] A1-5: ethylene propylene diene copolymer rubber (E
PDM) [Moonie viscosity 90 (100 ° C), trade name; J
SLER57 manufactured by Japan Synthetic Rubber Co., Ltd.] A1-6: Ultra-low density polyethylene (VLDPE) [M
FR = 1.0 g / 10 min, density 0.900 g / cm ³
Product name: Nisseki Softlex D9010 manufactured by Nippon Petrochemical Co., Ltd.]

A2-1: Maleic anhydride-modified ethylene-
Butene 1 copolymer [maleic acid content 0.4% by weight, MF
R = 0.3 g / 10 min, density 0.920 g / cm ³ ] A2-2: Silane-modified polyethylene Polyethylene resin [trade name; Nisseki Linirex AF1
210 Nippon Petrochemical Co., Ltd .; MFR = 0.8; Density 0.920 g / cm ³ ] 100 parts by weight benzoyl peroxide 0.3 parts by weight, vinyltrimethoxysilane 1.5 parts by weight, antioxidant tetrakis [Methylene-
(3,5-Di-t-butyl-4-hydroxylphenyl) -propionate] 0.2 parts by weight of methane was dry blended, reacted at 210 ° C. using a Banbury mixer, and then pelletized. The physical properties of the silane-modified polyethylene were MFR = 2.1 g / 10 minutes and the content of vinyltrimethoxysilane was 1.2% by weight.

Component (B) Inorganic flame retardant: B-1 Magnesium hydroxide [Mg (OH) ₂ , trade name; Kisuma 5B manufactured by Kyowa Chemical Co., Ltd.] B-2 Red phosphorus [trade name; HISHIGARD NP-10 Made by Nippon Chemical Industry Co., Ltd.]

[Sample Preparation Method] Table 1 shows the components A and B, respectively.
The predetermined amount shown in (1) was dry blended and kneaded with a 50 mmΦ extruder to form pellets. The composition was pressed into a sheet having a predetermined thickness and the oxygen index was measured. The results are shown in Table 1. The oxygen index was measured according to JIS K7201. (Examples 1 to 24, Comparative Examples 1 to 21) Furthermore, sheets having various thicknesses formed by a T-die molding machine were subjected to various stretching at temperatures from room temperature to 160 ° C shown in Tables 2 to 4 by a proximity stretching device. The sheet was stretched to a ratio and formed into a sheet having a thickness of 0.1 mm. The sheet was coated with an acrylic pressure-sensitive adhesive, and the tensile strength at break and elongation at break and the volume resistivity were measured.
The volume resistivity was measured according to JIS C2110.
The results are shown in Tables 2-4.

[0055]

[Table 1]

[0056]

[Table 2]

[Table 3]

[Table 4]

Sheet No. The sheet No. 2 does not have flame retardancy because the amount of the inorganic flame retardant as the component (B) is small. The tapes of Comparative Examples 5, 10, and 14 were too hard,
Inadequate due to insufficient strength. In Comparative Example 8, Comparative Example 16, Comparative Example 18, and Comparative Example 19, tape molding was impossible.

[0058]

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. Forming a base material by stretching a sheet using a resin composition,
By applying a sticky substance on the base material, it imparts a high degree of flame retardancy and is excellent in electrical characteristics, flexibility, molding processability, workability during winding work, and molecular orientation by stretching. A flame-retardant tape having excellent mechanical properties such as tensile modulus, creep resistance and heat resistance can be obtained.
The flame-retardant tape of the present invention having such excellent characteristics can be used for various power generations such as automobiles, vehicles such as trains and buses, ships, aircrafts, general houses, nuclear laboratories that regulate the amount of corrosive gas. As an insulating tape for plants, chemicals, steel, petroleum, etc., and electrical equipment used in places where high flame retardancy is required, such as in the fields of textiles, electricity, electronics, construction, civil engineering, etc. Can be used.

Claims (1)

[Claims] 1. A flame-retardant tape comprising a base material obtained by stretching a polyolefin resin composition containing the following (A) and (B), and applying an adhesive substance to the base material. 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 the above 100 parts by weight of resin mixture, and (B) inorganic flame retardant 30 to 200 parts by weight