JPH02206632A - Flame-retardant polyolefin resin composition having improved surface haze properties - Google Patents

Abstract

PURPOSE:To provide the subject composition composed of a resin component consisting of a polyolefin resin as the main component, a specified flame- retardant and a fluorine-based elastomer, excellent in tensile strength, acid resistance, electrical properties, etc., and useful as an electric material such as an electric wire or a cable. CONSTITUTION:An objective composition composed of (A) 100 pts. wt. resin component consisting of (i) 99-60wt.% polyolefin resin (preferably ethylene-alpha- olefin copolymer with 0.86-0.91g/cm<3> density, etc.) and (ii) 1-40wt.% polyolefin modified by an unsaturated carboxylic acid(derivative) [e.g. (meth)acrylic acid] as the main components, (B) 50-200 pts.wt., preferably 80-135 pts.wt. flame- retardant (preferably magnesium hydroxide, etc.) containing a hydrate of an inorganic metal compound at least as one component and (C) 0.01-5 pts. wt., preferably 0.05-2 pts.wt. fluorine-based elastomer.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to polyolefins, particularly edge-1/α-olefin copolymers, copolymers of ethylene and unsaturated carboxylic acids, esters thereof, or seven metal salts. and an ethylene copolymer of at least 1'M1 selected from the group consisting of ethylene-vinyl ester copolymers, a nine-olefin polymer modified with an unsaturated carbon dioxide or a derivative thereof, and a flame retardant. Excellent mechanical strength, heat resistance, acid resistance, and surface whitening prevention of molded products.f:
, relates to flame retardant J Refine polymer compositions.

(Prior art) Because polyolefins have excellent physical and chemical properties, they are molded into films, sheets, vibrators, containers, etc. using various molding methods such as extrusion molding, injection molding, and rotary molding, and are used for household and industrial purposes. It is the most in-demand general-purpose resin used in many applications.

Since the above-mentioned polyolefin is easily flammable, various methods have been conventionally proposed for making it flame retardant.

The most common method is to add a halogen flame retardant to the polyolefin to make it flame retardant.

However, although halogen flame retardants are effective in small amounts, they have the disadvantage of generating harmful gases when burned.

Nowadays, it does not generate harmful gases when burned and has low smoke properties.

As a non-polluting flame retardant, a method of making flame retardant by blending a large amount of a hydrate of an inorganic metal compound, particularly magnesium hydroxide, is rapidly becoming popular.

However, when a composition containing a hydrate of an inorganic metal compound is used for electric wires and cables, it has the disadvantage that whitening occurs on the surface during construction and use.

(Problems to be Solved by the Invention) In view of the above points, the present invention has excellent mechanical strength, acid resistance, processability, and flame retardancy, and has remarkable resistance to surface whitening, and has acid resistance. The present invention provides a flame-retardant olefin polymer resin composition with improved flame retardant properties, which can be used for electric wires, cables, backings, sealing materials, hoses, films,
It is suitably used for molding purposes such as injection products, and as masterbatches.

(Means for solving the problem) The present invention company: 1) polyolefin resin 99 to 60 wts; b) 1 to 40 wt% of an olefin polymer modified with an unsaturated carboxylic acid or its derivative; and gold as the main component. Consisting of 1001 parts by weight of a resin component, C) 50 to 200 parts by weight of a flame retardant containing a hydrate of an inorganic metal compound as at least one component, and d) 0.01 to 5 parts by weight of a fluorine-containing distomer. This is a flame-retardant olefin polymer composition.

In the present invention, the polyolefin resin which is component a) is a homopolymer of α-olefin such as ethylene, propylene, 1-phtene, 1-hexene, 4-methyl-1-pentene, 1-f-pentene, or a mutual copolymer thereof. At least one culm selected from the group consisting of polymers, copolymers of ethylene and unsaturated carboxylic acids or esters thereof, or metal salts thereof, and ethylene-vinyl ester copolymers such as ethylene-vinyl acetate copolymers. .

Among these, especially ethylenically unsaturated carboxylic acid t+
is its ester or metal salt copolymer, ethylene-vinyl ester copolymer and density 0.86 to 0.912
A 7-ethylene-α-olefin copolymer is preferred.

Specific examples of the unsaturated carboxylic acids or their esters and vinyl esters include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, 7-malic acid, maleic anhydride, and itaconic anhydride; Methyl san, ethyl acrylate, ethyl kuma acrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, inoglovir methacrylate, n-butyl acrylate, 1I-n-butyl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate, acrylic Lauryl acid, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, maleic acid monomethyl ester, maleic acid monoethyl ester,
Unsaturated carboxylic acid ester monomers such as diethyl maleate, monomethyl 7-malate, glycidyl acrylate, glycidyl methacrylate; vinyl propionate, vinyl acetate, vinyl caproate, vinyl laurate, vinyl stearin, trifluoroacetic acid Examples include vinyl ester monomers such as vinyl dispersion.

Among these, (meth)acrylic acid alkyl esters and vinyl esters are particularly preferred, and ethyl acrylate and vinyl acetate are more preferred. These monomers can also be used in combination.

Specific examples of the above copolymers include ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-ethyl methacrylate copolymer, and ethylene-vinyl acetate copolymer. Copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-acrylic acid-ethyl acrylate copolymer, ethylene-vinyl acetate-1-acrylic ethyl copolymer, ethylene-methacrylic liquid glycidyl-acrylic AI ethyl copolymer, or metal salts (ionomers) thereof. These copolymers may be used in combination.

The melt 70-rate (hereinafter abbreviated as MFR) of the above copolymer is 0.1 to 509710 m1n, preferably 0.3 to
A range of 20 f/1 O-il is desirable.

If the VFR is less than 0.1 f/10nxin, the workability will be poor, and if it exceeds 50 f/10nin,
This is not preferable because the mechanical strength decreases.

As for the olefin polymer modified with an unsaturated carboxylic acid or its derivative, which is component b) of the present invention, the unsaturated carboxylic acid or its derivative is 0% of the olefin polymer.
．． 05 to 10118% is modified in the presence of an organic peroxide, and the light is prepared by mixing the modified product with an unmodified olefin polymer.

The above olefin polymers include polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-
Olefin polymers such as pentene; ethylene, propylene:/, 1~/f, 4-methyl-1~pentene, l-
Mutual copolymers of hexene, 1-octene, etc.; copolymers of ethylene with vinyl esters, unsaturated carboxylic acids, unsaturated carboxylic acid esters, etc., and mixtures thereof, etc. are used, but preferably polyethylene, polypropylene, and An ethylene-α-olefin copolymer such as an ethylene-butene-1 copolymer, more preferably a density of 0.86 to 0.
97 g/cm3 of ethylene homopolymer or ethylene-
α-olefin copolymers and mixtures thereof are used.

Sixth In the present invention, polyisobutylene, butyl rubber, ethylene-propylene rubber, ethylene-propylene-
diene rubber, polybutadiene rubber, chloroprene rubber,
Synthetic rubbers such as solid rubbers such as urethane rubber, ethylene-vinyl acetate copolymer rubber, liquid rubbers such as liquid polybutadiene rubber, natural rubbers, and mixtures thereof may all be used in combination with the above-mentioned olefin polymers.

On the other hand, as unsaturated carboxylic acids or their derivatives,
Examples include -basic and dibasic acids such as acrylic acid, methacrylic acid, maleic acid, and fumaric acid, or metal salts, amides, imides, esters, or anhydrides of the above-mentioned unsaturated carboxylic acids. Among these, maleic anhydride is most preferred.

As a method for modifying an olefin polymer with an unsaturated carboxylic acid or a derivative thereof, a method in which both are heated and reacted in the presence of an organic peroxide is preferred.

The above reaction is carried out by melt-mixing in an extruder or a mixer such as a Banbury mixer without a solvent. The method of reaction by heating and mixing in a solvent such as a group hydrocarbon is not particularly limited, but it is preferable to carry out the reaction in an extruder because it is easy to operate and is economical.

The addition t of the unsaturated carboxylic acid or its derivative is 0
．． It is in the range of 0.05 to 10% by weight, preferably 0.1 to 5.0% by weight. If the above addition amount is less than 0.05% by weight,
The effect of the present invention is not sufficient, and the coupling effect between the resin and the flame retardant is not exhibited.

In addition, if it exceeds 100 parts by weight, it will be decomposed during denaturation.
There is a possibility that a crosslinking reaction may occur simultaneously.

Examples of the organic oxides include benzoyl peroxide, lauryl peroxide, dicumyl peroxide, t-butyl hydroperoxide, α-bis(t-butylperoxydiinglobyl)benzene, di-t-butyl peroxide, 2. 5-di(1-butylperoxy)hexyne, azobisisobutyronitrile, etc. are preferably used, and 0.0 parts by weight per 100 parts by weight of the olefin polymer.
05-20y parts, preferably 0.01-1. Of!
It is used within the range of the jI' portion. Organic peroxide element is 0.
005 When the weight is full, the modification effect is not substantially exhibited, and even if it is added in excess of 2 parts by weight, it is difficult to obtain any further effect, and it also causes decomposition of brittleness or crosslinking reaction. There is a risk of causing

The above reaction is carried out under customary temperature conditions, i.e. resin degradation,
It is selected as appropriate, taking into consideration the decomposition temperature of unsaturated carboxylic acid, the decomposition temperature of organic peroxide, etc., but generally 150 to 30
It is carried out in the range of 0°C.

The above-mentioned olefin polymer modified with an unsaturated carboxylic acid or its derivative can be used by further adding and mixing an unmodified olefin polymer and/or an unmodified rubber. The mixing ratio of the modified olefin polymer to the unmodified olefin polymer and/or the unmodified rubber is optional, but the weight ratio is 1:99 to 80:20, preferably 10:90 to 60:40. be.

In the present invention, the blending amount of component b) is in the range of 1 to 40% by weight, preferably 10 to 30% by weight based on component a).

When the amount of component b) is less than 1% by weight, there is little improvement in tensile strength, and when it exceeds 40% by weight, the elongation is significantly reduced.

As the flame retardant which is component C) of the present invention, a flame retardant containing a hydrate of an inorganic metal compound as at least one component (hereinafter referred to as an inorganic flame retardant) is used.

Examples of the inorganic flame retardant include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, basic magnesium carbonate, dolomite, hydrotalcite, calcium hydroxide, barium hydroxide, tin oxide hydrate, and silt. Hydrates of inorganic metal compounds, zinc halide, lead metabolate,
Barium metabolate, zinc carbonate, magnesium carbonate-calcium carbonate, calcium carbonate, barium carbonate, magnesium oxide, molybdenum oxide, zirconium oxide, tin oxide,
Examples include antimony oxide and red phosphorus. These are 1s
However, 2s or more may be used together. Among these, at least 1S selected from the group consisting of magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, and no-hydrotalcite has a good flame retardant effect and is economically advantageous. Also, the particle size of these flame retardants varies depending on the type, but
For magnesium hydroxide, aluminum hydroxide, etc., the average particle size is preferably 20 μm or less.

The blending amount of the above inorganic flame retardant is resin component a) + b) 1
50 to 200 parts by weight, preferably V
s, 60 to 150 parts by weight, more preferably 80 to 135 parts by weight
Used in parts by weight range.

If the blending amount is less than 50 parts by weight, it is difficult to achieve sufficient flame retardancy using the inorganic flame retardant alone, so it is necessary to use an organic flame retardant in combination.

On the other hand, when 200 parts by weight is added, mechanical strength such as impact strength decreases, flexibility is lost, and low-temperature properties deteriorate.

Further, in the present invention, flame retardants that are generally considered to be effective can be used in combination.

Examples of the flame retardant include organic flame retardants such as halogen flame retardants and phosphorus flame retardants.

Examples of the halogenated flame retardants include brominated flame retardants such as tetrabromobisphenol (TBA), hexabromobenzene, decabromodiphenyl ether, tetrabromoethane (TBE), tetrabromobutane (TBB), and hexabromocyclodecane (BCD). and chlorinated flame retardants such as chlorinated paraffin, chlorinated polyphenyl, chlorinated polyethylene, chlorinated diphenyl, perchloropentacyclodecane, and chlorinated naphthalene, and common halogenated flame retardants such as halogenated diphenyl sulfides; brominated Polystyrene, halogenated polystyrene or its derivatives such as brominated poly-α-methylstyrene, halogenated polycarbonates such as brominated polycarbonate, halogenated polyesters such as polyalkylenetetrabromo terephthalate, brominated terephthalic acid polyester, halogenated bisphenol type Examples include flame retardants made of high molecular weight halogen-containing polymers such as halogenated epoxy compounds such as epoxy resins, halogenated polyphenylene oxide compounds such as poly(dibromophenylene oxide), and cyanuric acid ester compounds of halogenated bisphenols.

Examples of phosphorus flame retardants include phosphorus ester modifiers such as tricresyl phosphate, ) I7 (β-chloroethyl) phosphate, tri(dibromopropyl) phosphate, and 2,3-dibromopropyl-2,3-chloropropyl phosphate. Main examples include halogenated phosphate esters, phosphonic acid compounds, and phosphine derivatives.

Other flame retardants include guanidine compounds such as guanidine nitride.

These flame retardants can exhibit a synergistic effect when used in combination with a flame retardant aid.

The flame retardant aids include antimony trioxide, antimony pentoxide, antimony trichloride, antimony pentachloride, etc.
Typical examples include antimony compounds such as antimony logenide, antimony trisulfide, antimony trisulfide, antimony-brewed soda, antimony tartar, and antimony metal.

The fluorine-based elastomer, which is component d) of the present invention, imparts water resistance and prevents surface whitening when added in an extremely small amount to the extent that the generation of harmful gases can be ignored. In addition to preventing whitening, it is also effective in improving the acid resistance of the composition, preventing the formation of eye mucus during processing, and improving molding processability. The blending amount is the above a) + b) component 100, and C)
0.01 to 5 parts by weight, preferably 0.02 to 3 parts by weight, more preferably 0.02 to 3 parts by weight, based on component 50 to 20011 parts.
It is used in a range of 0.5 to 2 parts by weight.

If the amount of the fluorine-based nidistomer is less than 0.011 parts by weight, the effect of preventing whitening will be small; if it exceeds 5 parts by weight, not only will the tensile strength etc. decrease, but the molded surface will become slippery, making it difficult to handle the molded product. There is a risk that it will be difficult to clean or that harmful gases will be generated. Furthermore, even if more than this is added, the whitening prevention effect remains unchanged, which is not desirable in terms of cost.

As mentioned above, the flame-retardant olefin polymer resin composition of the present invention has the disadvantages of conventional flame-retardant compositions when a large amount of inorganic flame retardant is blended, especially by blending the component b). It prevents a decrease in tensile strength, improves heat resistance, and also plays a role in preventing dripping of the composition during combustion, achieving a high degree of flame retardancy.

In addition, component d) not only imparts water repellency to the surface of the composition to prevent whitening, but also has the role of improving the acid resistance of magnesium hydroxide and preventing eye mucus during processing.

In particular, among the &) components, ethylene-unsaturated carboxyl alkyl ester copolymers such as ethylene-acrylic ethyl copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl ester copolymer, density 0.86 to 0. 91
The composition in combination with an ethylene copolymer such as f/2-ethylene-α-olefin copolymer has good receptivity to inorganic compounds, and by adding an appropriate amount of the modified olefin polymer as component b), The coupling effect between component a) and magnesium hydroxide in component C) works to improve tensile strength while minimizing the decrease in elongation, and the addition of component d) improves the surface of the water-treated magnesium. Coating is performed, and the water resistance and acid resistance of the compound are improved, and the component d) that bleeds onto the surface of the composition during processing forms a thin film, which is thought to prevent whitening and improve acid and water resistance. .

Further, in the present invention, by using the above composition and an inorganic filler in combination, the amount of flame retardant added can be reduced and other properties can be imparted.

The above inorganic fillers include calcium sulfate, calcium silicate, clay, diatomaceous earth, talc, alumina, silica sand, glass powder, iron oxide, metal powder, graphite, silicon carbide, silicon nitride, silica, boron nitride, aluminum nitride, and carbon. Black, mica, glass plate, sericite, pyrophyllite, aluminum flakes, graphite, shirasu balloon, metal balloon, glass balloon, pumice, glass fiber, carbon fiber, whisker metal fiber, graphite fiber, silicon carbide fiber, asbestos , wollastonite, etc.

The blending amount of these ingredients is approximately 1001 parts by weight per 100 parts by weight of the composition of the present invention. The above blending amount is 10
If it exceeds 0 parts by weight, the mechanical properties such as impact strength of the molded article will deteriorate, which is not preferable.

In the present invention, when an inorganic flame retardant or an inorganic filler is used, the surface of the flame retardant or filler is coated with a fatty acid such as stearic acid, oleic acid, balmitic acid, etc. It is preferable to perform surface treatment such as coating with salt, paraffin, wax, polyethylene wax or modified products thereof, organic silane, organic borane, organic titanate, etc.

The composition of the present invention is prepared by mixing a resin composition, a flame retardant, a flame retardant aid, an anti-scratch whitening agent, optionally an inorganic filler, and additives using a Banbury mixer, a pressure kneader, a kneading extruder, and a twin-screw extruder. It is melt-kneaded using a conventional kneading machine such as a machine, roll, etc., made into pellets, etc., and used as molded products, masterbatches, etc. In addition, it is also tri-blended with the above resin components, flame retardants, flame release aids, etc. Good too.

In the present invention, depending on the purpose of use, the above composition may be added with other thermoplastic resins, synthetic rubber, natural rubber or organic fillers, antioxidants, lubricants, various organic and inorganic pigments, ultraviolet inhibitors, There is no problem in adding additives such as dispersants, copper damage inhibitors, neutralizing agents, blowing agents, plasticizers, anti-foaming agents, weld strength improvers, nucleating agents, etc. to the extent that they do not deteriorate the composition. Further, in order to introduce a crosslinked structure, there is no problem in adding a crosslinking agent (for example, an organic peroxide, sulfur, a silane type crosslinking agent, etc.) or a crosslinking aid, or irradiating with ionizing radiation.

(Example) Examples are shown below, but the present invention is not limited by these in any way.

<Resins and materials used> a) Component Hatake-1 = Ethylene-ethyl acrylate copolymer (MF
R = 0.75'/ 10 min, trade name: 8-stone Xuron A1150 manufactured by Nippon Petrochemicals) &-2; ethylene-vinyl acetate copolymer (MFR = 1.
0f/10m1n, Product name - 8 stone Kushlon v260
Nippon Petrochemical Co., Ltd.) 1-3: Ethylene-α-olefin 11 combination (MFR=
1.0f/10m1n, density=0.900. Product name: Nisseki Softlex D9010) a) Component maleic acid-modified linear low-density polyethylene (product name: 8 stone N Polymer L6100 manufactured by Nippon Petrochemical Co., Ltd.) C) component c-1: Magnesium hydroxide (product name: Kisuma) 5B, manufactured by Kyowa Chemical ■) c-2: Aluminum hydroxide (product name: Hygilite 42M, manufactured by Nippon Light Metal ■) d)
Component d-1: A master patch in which a copolymer of propylene fluoride and vinylidene fluoride is dispersed in linear low-density polyethylene at a concentration of 1.7% (trade name: PA-1700, manufactured by Polycol Kogyo ■) d-
2: For comparison, low-density polyethylene in which 40% of polyorganosiloxane was graft-polymerized was used.

(Product name: 5P-300, manufactured by Dow Corning ■) <Test method> (1) Tensile strength 1 (UTS) and elongation (UEL) (H) A test piece punched out with a No. 3 dumbbell from a 1-thick sheet of snow. , tensile speed 200 ml/min using Tensilon
, was measured at a speed of .

(2) rR prime number 0. I) This was done in accordance with JIS K7201.

(3) Surface whitening test 400 A tube-shaped sample is hung in a sealed autoclave filled with water, 99% nitrogen, and a gas mixture with a carbon dioxide concentration of 1 to 72 toz, and the surface whitening status of the sample is visually observed. It was observed and evaluated as follows.

1... No whitening at all 2... Signs are seen 3
...Thin whitening 4...Whitening 5...Full whitening Examples 1 to 4 The above a) component, b) component, C) component and d) component were tri-blended in the proportions shown in Table 1. The mixture was melt-kneaded and granulated using a twin-screw extruder. Table 1 shows the results of each test conducted using the Beretsu) f.

Comparative Examples 1 to 3 Comparative Examples 1 to 3 Comparative Examples 1 to 3 were carried out in the same manner except that among the components used in the Examples, the amount of component d) was outside the scope of the claims of the present invention, and the evaluation results are shown in Table 1.

Comparative Example 4 The same procedure as in Example was repeated except for the round plate except that polyorganosiloxane was used instead of the fluorine-treated elastomer as the component d). The results are shown in Table 1.

(Effect of the invention) As mentioned above, the flame-retardant olefin resin composition of the present invention has the following properties:
a) Component polyolefins, especially copolymers of ethylene and unsaturated carboxylic acids or their esters, metal salts thereof, such as ethylene-ethyl acrylate copolymers, and ethylene vinyl ester copolymers, such as ethylene-vinyl acetate copolymers. Polymers, ethylene-α-olefin copolymers such as ethylene-propylene copolymers, and olefin polymers modified with component b) unsaturated carboxylic acids or derivatives thereof, especially maleic anhydride-modified linear low-density By incorporating magnesium hydroxide as component C) and a fluorine-based elastomer as component d), the amount of inorganic flame retardant accepted can be increased, and the coupling effect between the resin component and the inorganic flame retardant can improve flame retardancy. It has become possible to completely enhance the synergistic effect of properties, prevent a decrease in mechanical strength such as tensile strength, which is a drawback of conventional inorganic flame-retardant resin compositions, and improve heat resistance.

Furthermore, by incorporating component d), the anti-whitening performance and acid resistance can be dramatically improved, which meets the needs of today.

Furthermore, since the composition of the present invention has excellent electrical properties, it can be used as electrical materials such as electric wires and cables, with or without crosslinking. In particular, highly flame-retardant cables are required for power generation plant cables such as the Atomic Energy Research Institute, which regulate the amount of corrosive gas, cables for chemical, steel, and petroleum plants, fire-resistant electric wires, and general house wiring. It is suitable for use in places where

It is also used as extrusion molded products such as films, sheets, pipes, etc., as well as injection molded products and master patches.
Panels, packaging materials for various fields such as electronics, electricity, automobiles, ships, aircraft, architecture, civil engineering; I-electricity,! It is used for air parts, automobile parts, furniture, household goods, etc.

Claims (7)

[Claims] (1) a) 99 to 60% by weight of polyolefin resin, and b
) 100 parts by weight of a resin component whose main component is 1 to 40% by weight of an olefin polymer modified with an unsaturated carboxylic acid or its derivative; c) a flame retardant 50 containing a hydrate of an inorganic metal compound as at least one component; 200 parts by weight, and d) 0.01 to 5 parts by weight of a fluorine-based elastomer. (2) The polyolefin resin of component a) is selected from the group consisting of a copolymer of ethylene and an unsaturated carboxylic acid, its ester or its metal salt, an ethylene-vinyl ester copolymer, and an ethylene-α-olefin copolymer. Claim 1 is at least one ethylene copolymer made of
The flame retardant olefin polymer resin composition described. (3) The ethylene copolymer is an ethylene-(meth)acrylic acid alkyl ester copolymer, an ethylene-vinyl acetate copolymer, or a density of 0.86 to 0.91 g/cm^3
The flame-retardant olefin polymer resin composition according to claim 2, which is an ethylene-α-olefin copolymer. (4) The olefin polymer modified with the unsaturated carboxylic acid or its derivative as component b) has a density of 0.86 to
The flame-retardant olefin polymer resin composition according to any one of claims 1 to 3, which is an ethylene (co)polymer having a weight of 0.97 g/cm^3. (5) The flame-retardant olefin polymer composition according to any one of claims 1 to 4, wherein the unsaturated carboxylic acid or its derivative is maleic anhydride. (6) Claims 1 to 3, wherein the hydrate of the inorganic metal compound is magnesium hydroxide and/or aluminum hydroxide.
5. The flame retardant olefin polymer resin composition according to any one of Item 5. (7) The fluorine-based elastomer is a copolymer of vinylidene fluoride and one or more monomers selected from chlorotrifluoroethylene, hexafluoropropylene, and tetrafluoroethylene.
6. The flame-retardant olefin polymer resin composition according to any one of 6.