JPS6211745A - Flame-retardant olefin polymer composition having excellent heat-resistance - Google Patents

Abstract

PURPOSE:To obtain the titled composition containing a large amount of flame- retardant and having excellent mechanical strength, by adding a specific amount of a flame-retardant to a resin component obtained by compounding specific component such as a copolymer of ethylene and a carboxyl-containing monomer (derivative) at specific ratio. CONSTITUTION:The objective composition can be proeuced by compounding (A) 50-90 (wt)% copolymer of ethylene and a monomer containing carboxyl group (preferably ethylene-ethyl acrylate copolymer, etc.) with (B) 1-40%, preferably 10-20% oelfin polymer (preferably PE, etc.) modified with an unsaturated carboxylic acid (derivative) (preferably maleic anhydride), (C) 5-40%, preferably 10-20% ethylene-alpha-olefin copolymer having a density of 0.88-0.97g/cm<3>, preferably 0.88-0.94g/cm<3> (the sum of the component A-C is 100%), and mixing 100 pts. (wt.) of the obtained resin composition with (D) 5-200pts., preferably 10-150pts. of a flame-retardant (preferably inorganic flame-retardant such as magnesium hydroxide). USE:Suitable as an electrical material such as insulation material, covering material, etc., of electrical wire.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an olefin polymer modified with ethylene and a carboxyl group-containing polymer or a derivative thereof, an unsaturated carboxylic acid or a derivative thereof, and an olefin polymer having a density of 0.88 to 0
．． The present invention relates to a flame-retardant olefin polymer composition having excellent heat resistance and mechanical strength and having an ethylene-〇-olefin copolymer having 97fΔ- as a base.

C) Polyethylene has excellent physical and chemical properties, so it can be formed into films, sheets, pipes, containers, etc. using various molding methods such as extrusion molding, injection molding, and rotary molding, and is used for household and industrial purposes. It is the most sought-after general-purpose resin used in many industrial applications.

Since the above-mentioned polyethylene is easily flammable, various methods have been proposed to make it flame retardant.

The most common method is to add a flame retardant containing halogen or phosphorus to the polyethylene to make it more flame retardant. The degree of flame retardation increases with the amount of flame retardant added. However, an increase in the amount added not only causes a decrease in mechanical strength, workability, etc., but also has the disadvantage of significantly impairing flexibility, cold resistance, etc. In addition, these conventional flame retardant compositions
From the perspective of disaster prevention, there is a trend in recent years to demand, and in some cases even mandate, a higher degree of flame retardancy. Inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide meet these needs and are rapidly increasing in demand. (For example, such techniques include JP-A-51-132254 and JP-A-56-13.
There are No. 6832, No. 60-13832, etc. ) However, conventionally commercially available polyethylenes have particularly poor receptivity to inorganic flame retardants and have low flame retardant effects.

In addition, when the filling amount is increased, mechanical strength, evacuation property, workability, etc. are reduced, and this has the disadvantage that it cannot be put to practical use.

On the other hand, examples of using a soft resin such as ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, chlorinated polyethylene, or ethylene-propylene copolymer rubber to increase the filling rate of the above-mentioned inorganic flame retardant However, it is well known that it is inferior in mechanical strength and heat resistance.

(Problems to be Solved by the Invention) In view of the above-mentioned points, the present invention provides a flame retardant composition that is particularly filled with a high amount of inorganic flame retardants and has excellent mechanical strength and heat resistance. It is something.

This flame-retardant composition is used for molding applications such as electric wires, cables, backings, sealing materials, hoses, films, and injection molded products, and as masterbatches.

(Means for Solving the Problems) The present invention comprises: a) 50 to 90% by weight of a copolymer of ethylene and a carboxylic acid or a derivative thereof; b) an olefin modified with an unsaturated carboxylic acid or a derivative thereof. 1 to 40% by weight of polymer and c) ethylene with a density of 0.88 to 0.97rΔ-
A resin component consisting of 5 to 40% by weight of an a-olefin copolymer (however, the total of a+b+c is 1 to 40% by weight)
The present invention provides a flame-retardant olefin polymer composition having excellent heat resistance, which contains 1 to 40 parts by weight of d) 5 to 200 parts by weight of a flame retardant.

Furthermore, the present invention provides electrical materials such as electric wires and cables using the above composition.

The copolymer of ethylene and a carboxyl group-containing or derivative thereof, which is component a) of the present invention, refers to a copolymer of ethylene and an unsaturated carboxylic acid or an ester thereof, such as an ethylene-acrylic acid copolymer, an ethylene -methacrylic acid copolymer, ethylene-ethyl acrylate copolymer,
Includes ethylene-ethyl methacrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-maleic anhydride copolymer, etc., and metal salts thereof (for example, ionomer resin, etc.). Other examples of copolymers include ethylene-vinyl acetate copolymers and the like. In particular, when an inorganic flame retardant is used, the content of the carboxyl group is preferably in the range of 5 to 30% by weight, preferably 10 to 25% by weight.

If the above content is less than 5% by weight, the receptivity to inorganic flame retardants will be poor, the product will become brittle, and there is a risk of a decrease in mechanical strength. If it exceeds 301 it%, there is a concern that the heat resistance will be inferior. be.

Among these, ethylene-ethyl acrylate copolymer, ionomer resin or ethylene-vinyl acetate copolymer are particularly preferred.

In addition, the melt index C of the above copolymer or less is simply MI
) is 0.1 to 10 f/10 min, preferably 0.3
A range of ~51/10 minutes is desirable.

When the above MI is less than 0.1F/10 minutes, the workability is
If the temperature exceeds 10 F/1°O, there is a concern that the mechanical strength will deteriorate.

The olefin polymer modified with an unsaturated carboxylic acid or its derivative, which is component b) of the present invention, refers to an olefin polymer modified with an unsaturated carboxylic acid or its derivative.
．． It is obtained by addition-modifying 05 to 10 ft. in the presence of an organic peroxide, or by mixing the modified product with an unmodified olefin polymer.

The olefin polymers include olefin homopolymers such as polyethylene, polypropylene, polybutene-1, poly-4-methyl-pentene-1, ethylene, propylene, butene-1,4-methyl-pentene-1, hexene-1, Mutual copolymers such as octene-1, copolymers of ethylene and vinyl esters, unsaturated carboxylic acids, unsaturated carboxylic acid esters, etc. are used, but preferred are polyethylene, polypropylene, and ethylene-butene-1 copolymers. A copolymer of ethylene and other α-olefin such as a polymer, more preferably a density of 0.88 to 0.97 g
/cm” of ethylene homopolymer or ethylene-〇-
Olefin copolymers and mixtures thereof are used.

In addition, in the present invention, polyimbutylene, butyl rubber, ethylene-propylene rubber, ethylene-propylene diene rubber, styrene-butadiene rubber, polybutadiene rubber, chloroprene rubber, urethane rubber, ethylene-vinyl acetate copolymer rubber, natural rubber solid rubber such as or synthetic rubber such as liquid rubber such as liquid polybutadiene,
Natural rubber and mixtures thereof may be used in combination with the olefin polymers.

On the other hand, examples of unsaturated carboxylic acids include monobasic acids and dibasic acids such as acrylic acid, methacrylic acid, maleic acid, heptamalic acid, crotonic acid, itaconic acid, and citraconic acid.

Examples of derivatives of unsaturated carboxylic acids include metal salts, amides, imides, esters, and anhydrides of the unsaturated carboxylic acids, and among these, maleic anhydride is most preferred.

The amount of unsaturated carboxylic acid or its derivative (hereinafter simply referred to as unsaturated carboxylic acid) added to the olefin polymer is 0.05 to 10 parts by weight, preferably 1 to 5 parts by weight, and the organic Heat the reaction in the presence of peroxide.

The above reaction is carried out by melt-mixing in an extruder or a mixer such as a Banbury mixer without a solvent,
Or, it is easy to operate, such as a method of reacting by heating and mixing in a solvent such as aromatic hydrocarbons such as benzene, xylene, toluene, or aliphatic hydrocarbons such as hexane, heptane, octane, etc., but is not limited to %. It is preferable to carry out this process in an extruder because it is economically efficient.

If the amount of the unsaturated carboxylic acid exceeds 10% by weight, there is a risk that decomposition and crosslinking reactions may occur in addition to addition reactions, and if it is less than 0.05% by weight, the effects of the present invention cannot be achieved.

Examples of the organic peroxide include benzoyl peroxide, lauryl peroxide, azobisisobutyronitrile, dicumyl peroxide, and t-butyl hydroper.

Oxide, Q,Q'-bis(1-butylperoxydiimprovil)benzene, di-t-butylperoxide, 2゜5-di(t-butylperoxy)hexyne, etc. are preferably used. 0.005 to 2.0 weight part 1 preferably 0.01 when combined is 1 to 40 parts by weight
It is used in a range of 1 part by weight. If the amount of organic peroxide added is less than 0.005 parts by weight, the modification effect will not be substantially exhibited, and even if it is added in excess of 2 parts by weight, it will be difficult to obtain any further effect, and it will be excessive. This may cause decomposition or crosslinking reactions.

The above reaction temperature is selected appropriately taking into consideration the usual temperature conditions, i.e. deterioration of the resin, decomposition of unsaturated carboxylic acid, decomposition temperature of organic peroxide, etc., but is generally 150°C to 30°C.
Reaction temperatures in the range of 0.000C are used.

The modified olefin polymer of the present invention may be further mixed with an unmodified olefin polymer, unmodified rubber, or the like, and then used. The mixing ratio of the above-mentioned modified olefin polymer and unmodified olefin polymer is arbitrary, but M
The quantitative ratio is preferably 1:99 to 50:50. More preferably, 1°=90 to 45:55.

In the present invention, the blending amount of component b) is in the range of 1 to 40% by weight, preferably 10 to 20% by weight, based on component a).

If the amount of component b) is less than 1% by weight, there will be little improvement in tensile strength, and if it exceeds 40% by weight, the reduction in elongation will be significantly poor.

The ethylene-〇-olefin copolymer, which is component c) of the present invention, includes low, medium, and high density ethylene-α-olefin copolymers, and the ethylene-α-olefin copolymers have a density of 0.88 to
0.97 f/cm', and a density always higher than that of component a) is used, especially one with a density in the range of 0.88 to 0.94 t/cIn3,
That is, what is usually called linear low density polyethylene has good compatibility with the components a) and b),
Moreover, it is preferable in that moldability, flexibility, etc. can be easily maintained.

The ethylene-a-olefin copolymer is a copolymer of ethylene and an a-olefin having 3 to 12 carbon atoms.

Specific a-olefins include propylene, butene-1,4-methyl pentene-1, hexene-1, octene-1, thecene-1, dodecene-1, and the like. Among these, particularly preferred are carbon atoms of 3 to 1 o.
Among the a-olefins, propylene and butene-1 are more preferred. The a-olefin content in the ethylene-〇-olefin copolymer is preferably from 5 to 40 mol.

The melt index of the ethylene-a-olefin copolymer of component c) is selected from the range of 0.05 to 50 t710 minutes, preferably 0.1 to 20 f710 minutes.

The amount of the above component c) is 5 to 40% by weight, preferably 1
It is selected in the range of 0 to 20 weight loss. If the amount is less than 5% by weight, the heat resistance will not improve significantly, and if it exceeds 40% by weight, flexibility will be lost. However, the blending amount is a) component,
The total of component b) and component c) is adjusted to be 100% by weight.

As the flame retardant, which is component d) of the present invention, additive flame retardants such as halogen flame retardants, phosphorus flame retardants, and inorganic flame retardants are used. As the halogen flame retardants, tetrabromobisphenol A (TBA ), hexabromobenzene, decabromodiphenyl ether, tetrabromoethane (T
Brominated paraffins such as BE), tetrabromobutane (TBB), and hexabromocyclodecane (HBCD), and chlorine such as chlorinated paraffins, chlorinated polyphenyl, chlorinated polyethylene, chlorinated diphenyl, perchloropentacyclodecane, and chlorinated naphthalene. It is more effective when used in combination with antimony trioxide, etc.

In addition, examples of phosphorus flame retardants include tricresyl phosphate, tri(β-chloroethyl) phosphate, tri(dichloropropyl) phosphate, tri(sifromoprovir) phosphate, 2.3-sifu'lomoprovir-2.
Main examples include phosphoric acid esters such as 3-chloropropyl phosphate, halide phosphoric acid esters, and the like.

Furthermore, the inorganic flame retardants of the present invention include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, basic magnesium carbonate, dolomite, hydrotalcite,
Calcium hydroxide, barium hydroxide, tin oxide hydrate, hydrate of inorganic metal compounds such as borax, zinc borate, zinc metaborate, barium metaborate, zinc carbonate, magnesium-calcium carbonate, calcium carbonate, carbonic acid Examples include barium, 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 these, magnesium hydroxide, aluminum hydroxide,
At least one selected from the group consisting of basic magnesium carbonate and hydrotalcite has a good flame retardant effect and is economically advantageous. Further, the branches of these flame retardants vary depending on the type, but for magnesium hydroxide, aluminum hydroxide, etc., the average particle size is preferably 20 μm or less.

The flame retardant used is 5 to 20 parts by weight per 1 to 40 parts by weight of resin.
0 parts by weight, preferably in the range of 10 to 150 parts by weight.

Especially when using only the above-mentioned inorganic flame retardant, 40
It is used in a range of parts by weight to 200 parts by weight. If the amount of the flame retardant is less than 5 parts by weight, the flame retardant effect is small, and 200
If the amount exceeds 1 part by weight, mechanical strength and elongation will decrease, flexibility will be lost, the product will become brittle, and low-temperature properties will also deteriorate.

In the present invention, at least one of the above-mentioned additive flame retardants is used, and especially when a halogen flame retardant is used, it is preferably used in combination with antimony trioxide. Further, in the present invention, by using an inorganic filler and a flame retardant in combination, the amount of flame retardant added can be reduced and other properties can be imparted.

The composition of the present invention comprises a) 50 to 90% by weight of a copolymer of ethylene and a carboxyl group-containing monomer or a derivative thereof, and b) 1 to 40% by weight of an olefin polymer modified with an unsaturated carboxylic acid or a derivative thereof. % and c) from 5 to 40% by weight of an ethylene-a-olefin copolymer having a density of 0.88 to 0.97F3 (provided that the sum of a, ten, and c is 1 to 40 by weight) Resin components 1 to 40
It is a flame retardant composition with excellent mechanical strength and heat resistance, which contains 5 to 200 parts by weight of d) flame retardant, particularly preferably component a), which is an oxygen-containing resin, and inorganic retardant. By combining with a flame retardant, the amount of flame retardant accepted can be increased and the additive flame retardant effect can be enhanced. In addition, by adding an appropriate amount of component b), an olefin polymer modified with an unsaturated carboxylic acid or its derivative, and component c), an ethylene-〇-olefin copolymer, component b) can be converted to component a), c) It has the effect of a coupling agent with component and component d), increases mutual compatibility, and significantly improves mechanical strength. on the other hand,
Addition of component c) has the effect of significantly improving the heat resistance of component a).

This means that the material can be suitably used as electrical materials such as insulating materials for electric wires, cables, etc., and jacket materials, which require materials with higher heat resistance, that is, materials with a smaller thermal deformation rate.

Examples of the inorganic filler as an optional component used in the present invention include powder, plate, scale, needle, spherical, hollow, and fibrous fillers, and specifically, calcium sulfate, lureum silicate, etc. , clay, diatomaceous earth, talc, alumina, silica sand, glass powder, iron oxide, metal powder, graphite,
Particulate fillers such as silicon carbide, silicon nitride, silica, boron nitride, aluminum nitride, carbon black, mica,
Glass plates, metal foils such as sericite, pyrophyllite, and aluminum flakes, flat or scaly fillers such as graphite, hollow fillers such as shirasu balloons, metal balloons, glass balloons, and pumice, glass fibers, and carbon fibers. , graphite fibers, whiskers, metal fibers, silicon carbide fibers, asbestos, mineral fibers such as wollastonite, and the like.

The amount of these additives to be added is approximately 1 to 40 parts by weight per 1 to 40 parts by weight of the composition of the present invention.

If the amount added exceeds 1 to 40 parts by weight, the mechanical strength such as impact strength of the molded article will decrease, which is not preferable.

In addition, in the present invention, when the inorganic flame retardant or inorganic filler is used, the surface of the inorganic material is coated with fatty acids such as stearic acid, oleic acid, palmitylic acid, or their metal salts, paraffin, wax, polyethylene, etc. It is preferable to perform surface treatment such as coating with wax or modified products thereof, organic silane, organic poran, organic titanate, etc.

The composition of the present invention is prepared by mixing a specific range of ethylene-a-olefin copolymer, a flame retardant, optionally an inorganic filler, additives, etc. in a Banbury mixer, a pressurized kneading machine, a kneading extruder, a twin-screw extruder, a roll The mixture may be melt-kneaded using a commonly used mixer, pelletized, etc., and provided as a molded product or masterbatch, or may be a tri-blend of the above resin components, flame retardants, additives, etc.

In the present invention, other synthetic resins, antioxidants, lubricants, organic
Addition of various inorganic pigments, UV inhibitors, dispersants, copper damage inhibitors, neutralizing agents, foaming agents, plasticizers, antifoaming agents, crosslinking agents, flowability improvers, weld strength improvers, nucleating agents, etc. Agents may be added within a range that does not significantly impair the effects of the present invention.

(Example) <Resin used> a) Component (ethylene-copolymer with carboxyl group-containing monomer) N Ethylene-ethyl acrylate copolymer (ethyl acrylate (EA) content = 15% by weight, MI = 0. 8P/1
0 min) B) Same as above (EA = 20 weight t
%, MI=1.5) c) Same as above (F
A = 10 heavy weights, weight = 0.5) D) ethylene-vinyl acetate copolymer (vinyl acetate content = 15% by weight, MI = 1
．． 4) (Brand: P1403, manufactured by Mikata DuPont Polychemical ■) b) Component (unsaturated carboxylic acid or its derivative modified fin polymer) E) Ethylene-butene-1 copolymer (density (d) =
0.9352263, M I = 0.8 rZt 0 min) (Brand: Nippon Seki Sunilex AM1720, manufactured by Nippon Petrochemical Co., Ltd.) F) Ethylene-butene-1 copolymer (d =
0.922g/cm”, MI=1.(1/10 min)(
Brand name Nippon Ishi Nirex AF2320, Nippon Petrochemical ■
G) Ethylene-butene-1 copolymer (d=o, 956f
Δ-1 MI = 1.6P/10 minutes) (Brand: Nippon Seki Star 7 Ren E715, manufactured by Nihon Petrochemical Co., Ltd.) The above three types of ethylene-〇-olefins (E), (F) and (G) Using a polymer, maleic anhydride 0.2
5% by weight and organic peroxide (trade name: Perhexine 2)
5B, manufactured by NOF Corporation) 0.02% by weight, and 50
The mixture was melt-kneaded at a temperature of 230° C. using an extruder having a diameter of aaφ (screw diameter) to obtain a modified ethylene-〇-olefin copolymer with an added amount of maleic anhydride of 0.15 weight. The MI of this modified product is E'=0.3t710 min, F'=0.
4 F/10 min, G'=0.6 f/10 min.

c) Component (ethylene-〇-olefin copolymer) J)
Ethylene-butene-1 copolymer (density = 0.935fΔ
-1MI = 0.8f710min) C brand Nippon Seki Sunilex AM1710, manufactured by Nippon Petrochemical Co., Ltd.) Phantom ethylene-butene-1 copolymer (density = Q, 9
559/cl, ytr=1.5yllo) (Brand: Nisseki Stafrene E71 & Nippon Petrochemical (2) Co., Ltd.) Resin component 1 to 40 weight consisting of predetermined amounts of the above a) component, b) component and c) component A predetermined amount of magnesium hydroxide (trade name: Kisuma 5B, manufactured by Kyowa Kagaku Co., Ltd.) was added as a flame retardant to the sample, and the physical properties were evaluated. The results are shown in Table 1.

Example 10 Example 2 except that 130 parts by weight of aluminum hydroxide C (trade name: Hygilite 42M1 manufactured by Nippon Light Metal Co., Ltd.) was used instead of magnesium hydroxide, which was the flame retardant of Example 2.
The evaluation results are shown in Table 1.

In place of the magnesium hydroxide flame retardant in Examples 2 and 6, a halogen flame retardant, a derivative of tetrabromobisphenol A (trade name: Fireguard 300) was used.
0, 30 parts by weight of Kijin Kasei (manufactured by Tousha) and 15 parts by weight of antimony trioxide were added, and the evaluation results are shown in Table 2.

The test method is as follows.

Test method> A test piece was prepared by punching out a No. 3 dumbbell from a sheet with a thickness of 1 m/rn, and a Tensilon was used at a tensile speed of 200 m/rn.
Measured at a speed of 1 minute.

A cylinder with a thickness of 6 m/m and a diameter of IQ m of 7 m is heated to 100°C.
The sample was pressurized with a load of 2.64 KF in an oil bath, and the deformation rate was determined after 30 minutes.

3. Oxygen index (0, I)... D, 2863-A, S, T, M samples burn for more than 3 minutes, or the combustion length is 5
9 m The minimum oxygen concentration required to continue burning over 7 m.

4. Based on flame retardant UL-standard V-2. (That is, the average self-extinguishing time is 25 seconds or less, and the maximum extinguishing time is 30 seconds or less.

(Actions and Effects of the Invention) As described above, the flame retardant composition of the present invention can be obtained by using a copolymer of ethylene and a carboxyl group-containing ester or its derivative as component a) in combination with an inorganic flame retardant. , an olefin polymer modified with a derivative thereof, and an ethylene-〇-olefin copolymer as component c), while enhancing the mutual effect of flame retardancy, and at the same time, component b), an unsaturated carboxylic acid, is modified with a derivative thereof. By blending an appropriate amount of, mechanical strength and heat resistance can be significantly improved, and the filling rate of flame retardants, inorganic fillers, etc. can be increased.
By using a hydrate of an inorganic metal compound, such as aluminum hydroxide or magnesium hydroxide, as a flame retardant, a flame retardant composition that does not generate harmful gases during combustion, has low smoke properties, and is non-polluting. This meets the recent needs for highly flame retardant properties.

Furthermore, since the composition of the present invention has excellent electrical properties, it can be used as electrical materials such as electrical insulating materials for electric wires and cables, and covering materials, with or without crosslinking. . In particular, a high degree of flame retardancy is required for cables used in various power generation plants, including nuclear power research institutes that specify the amount of corrosive gases, cables for chemical, steel, and petroleum plants, fire-resistant electric wires, and general household wiring. It is suitable for use in places where

It is also used for molding applications such as extrusion molded products such as films, sheets, and pipes, or injection molded products, and as masterbatches, and is used in various fields such as textiles, electricity, electronics, automobiles, ships, aircraft, architecture, and civil engineering. It is used for panels, packaging materials, furniture, household goods, etc.

Claims (14)

[Claims] (1) a) 50 to 90% by weight of a copolymer of ethylene and a carboxyl group-containing monomer or its derivative, b) 1 to 40% by weight of an olefin polymer modified with an unsaturated carboxylic acid or its derivative, and c) Density is 0.88 to 0.97 g/cm^3 and 5 to 40% by weight of an ethylene-α-olefin copolymer; d) A flame-retardant olefin polymer composition having excellent heat resistance and containing 5 to 200 parts by weight of a flame retardant. (2) The flame-retardant olefin polymer composition with excellent heat resistance according to claim 1, wherein the component a) is an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer. (3) The melt index of the ethylene-vinyl acetate copolymer or ethylene-ethyl acrylate copolymer is in the range of 0.1 to 10 g/10 min, and the content of vinyl acetate or ethyl acrylate is in the range of 5 to 30% by weight. A flame-retardant olefin polymer composition having excellent heat resistance according to claim 2. (4) Component c) has a density of 0.88 to 0.94 g/cm
A flame-retardant olefin polymer composition having excellent heat resistance according to claim 1, 2 or 3, which is an ethylene-α-olefin copolymer of ^3. (5) Flame retardant with excellent heat resistance according to claim 1, 2, 3, or 4, wherein the unsaturated carboxylic acid or its derivative as component b) is maleic anhydride. Olefin polymer composition. (6) The flame-retardant olefin polymer composition having excellent heat resistance according to any one of claims 1 to 5, wherein the component d) is a hydrate of an inorganic metal compound. (7) Claim 6, wherein the hydrate of the inorganic metal compound is aluminum hydroxide or magnesium hydroxide.
A flame-retardant olefin polymer composition having excellent heat resistance as described in 1. (8) a) 50 to 90% by weight of a copolymer of ethylene and a carboxyl group-containing monomer or its derivative, b) 1 to 40% by weight of an olefin polymer modified with an unsaturated carboxylic acid or its derivative, and c) Density To 100 parts by weight of a resin component consisting of 5 to 40% by weight of an ethylene-α-olefin copolymer having a copolymer of 0.88 to 0.97 g/cm^3 (however, the sum of a+b+c is 100% by weight), d ) An electrical material comprising a flame-retardant olefin polymer composition having excellent heat resistance and containing 5 to 200 parts by weight of a flame retardant. (9) The electrical material according to claim 8, wherein the component a) is an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer. (10) The melt index of the ethylene-vinyl acetate copolymer or ethylene-ethyl acrylate copolymer is in the range of 0.1 to 10 g/10 min, and the content of vinyl acetate or ethyl acrylate is in the range of 5 to 30% by weight. The electrical material according to claim 9. (11) Component c) has a density of 0.88 to 0.94 g/c
The electrical material according to claim 8, 9 or 10, which is an ethylene-α-olefin copolymer of m^3. (12) Claim 8, wherein the unsaturated carboxylic acid or its derivative as component b) is maleic anhydride;
The electrical material according to item 9, 10 or 11. (13) The electrical material according to any one of claims 8 to 12, wherein the component d) is a hydrate of an inorganic metal compound. (14) The electrical material according to claim 13, wherein the hydrate of the inorganic metal compound is aluminum hydroxide or magnesium hydroxide.