JPH0665435A - Cross-linkable flame retardant composition - Google Patents

Abstract

PURPOSE:To obtain a cross-linkable flame retardant composition, capable of holding mechanical strength, flexibility, processability, flame retardancy, etc., having a high cross-linking ratio, excellent in heat resistance and utilizable as molding applications such as films, sheets, containers, electric wires, cables, packings, sealing agents, hoses and injection molded products. CONSTITUTION:This cross-linkable flame retardant composition comprises 100 pts.wt. resin component composed of (A) an ethylenic copolymer having carbon- carbon unsaturated bond and (B) a polyolefinic resin or rubber having functional groups selected from epoxy, hydroxyl, etc., and (C) 30-200 pts.wt. inorganic flame retardant. The content of functional groups in the resin components (A) and (B) is 1X10<-3> to 20mol%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is based on an ethylene copolymer having a crosslinkable carbon-carbon unsaturated bond (hereinafter abbreviated as ethylene copolymer) and an inorganic flame retardant, and has abrasion resistance, heat resistance and The present invention relates to a crosslinkable flame-retardant composition having excellent flame retardancy, and more specifically, it retains flexibility, mechanical properties and chemical resistance, is excellent in wear resistance and heat resistance, and has a high resistance to halogen gas such as halogen gas during combustion. The present invention relates to a crosslinkable flame retardant composition that does not generate toxic gas.

[0002]

2. Description of the Related Art Polyethylene resins are excellent in physical and chemical properties, and are therefore formed into films, sheets, pipes, containers, electric wires, cables, etc. by various molding methods such as extrusion molding and injection molding. It is the most popular general-purpose resin used in many applications for household and industrial applications. Since the above-mentioned polyethylene resin is flammable, various methods for making it flame-retardant have been conventionally proposed. The most general method is to add flame retardant to the polyethylene resin by adding an organic flame retardant such as halogen or phosphorus. However, although these flame retardants are effective with a small amount of compounding, they have the drawback of generating harmful gas during combustion. Recently, it is well known that hydrates of inorganic metal compounds such as aluminum hydroxide and magnesium hydroxide are effective as a pollution-free flame retardant that does not generate harmful gas during combustion, has low smoke properties, and is non-polluting. (JP-A-2-53845, JP-A-2-145632). However, the inorganic flame retardant has a drawback that the mechanical strength, flexibility, and workability are deteriorated when the filling amount is increased to enhance the flame retardancy. Further, these have problems such as insufficient heat resistance.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a crosslinkable flame-retardant composition satisfying the above requirements, which is excellent in mechanical strength, flexibility, processability, flame retardancy and heat resistance. The composition is a film, sheet, container,
It is used for forming electric wires, cables, packing, sealants, hoses, injection products, etc.

[0004]

According to claim 1 of the present invention,
A) an ethylene copolymer having a carbon-carbon unsaturated bond and B) a polyolefin resin or rubber having a functional group selected from the following a to g, and A) + B) the functional group in the resin component is 1 Provided is a crosslinkable flame-retardant composition containing 100 parts by weight of a resin component having x10 ^{-3 to} 20 mol% and 30 to 200 parts by weight of an inorganic flame retardant C). a: carboxylic acid group, carboxylic acid ester group or acid anhydride group, b: epoxy group, c: hydroxyl group, d: amino group, e: alkenyl cyclic iminoether group f: functional group derived from unsaturated silane compound g : Functional group derived from unsaturated titanate compound

The present invention will be described in detail below. The ethylene copolymer having a carbon-carbon unsaturated bond of the component (A) in the present invention means a monomer having ethylene and two or more carbon-carbon unsaturated bonds and, if desired, another unsaturated monomer. A copolymer consisting of, or an ethylene homopolymer,
Linear low density polyethylene (LLDPE), ultra low density polyethylene (VLDPE), ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene copolymer rubber (EPDM), ethylene and other α-olefins Of ethylene, vinyl-acetate copolymer, ethylene- (meth) acrylic acid or its alkyl ester copolymer, etc., is added with a monomer having two or more carbon-carbon unsaturated bonds. It includes the following.

The above-mentioned monomer having two or more carbon-carbon unsaturated bonds means allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene, divinyltoluene, 1,5-hexadiene-3-yne. , Divinyl compounds such as hexatriene, divinyl ether and divinyl sulfone, polyfunctional methacrylate monomers represented by trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triallyl isocyanurate, diallyl phthalate, vinyl butyrate Polyfunctional vinyl monomers such as phthalates, allyl phthalate, diallyl compounds such as 2,6-diacrylphenol and diallyl carbinol, and other allyl styrene, divinyl styrene, 5
-Vinyl-2-norbornene (VBH), 5-ethylidene-2-norbornene (EBH), vinylcyclohexene (VCH), allyl (meth) acrylate, vinyl (meth) acrylate.

Other unsaturated monomers include α-olefins such as propylene and 1-butene, styrene and its derivatives, acrylic acid, methacrylic acid, maleic acid, fumaric acid, maleic anhydride, itaconic anhydride and the like. Unsaturated carboxylic acids,-(meth) acrylic acid -methyl, -ethyl, -propyl, -isopropylate, -n-butyl, -cyclohexyl, -lauryl, -stearyl and other alkyl esters, maleic acid monomethyl ester, dimethyl maleate. Ester, maleic acid monoethyl ester, maleic acid diethyl ester, fumaric acid monomethyl ester,
Examples thereof include unsaturated carboxylic acid esters such as glycidyl (meth) acrylate, vinyl propionate, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate, vinyl trifluorate, and the like. Among these, (meth) acrylic acid alkyl ester and vinyl ester are particularly preferable. More specifically, ethyl acrylate, methyl methacrylate and vinyl acetate can be mentioned.

Specific examples of the ethylene copolymer having a carbon-carbon unsaturated bond as the component A) include ethylene-
Allyl (meth) acrylate copolymer, ethylene-vinyl (meth) acrylate copolymer, ethylene-allyl (meth) acrylate-vinyl acetate copolymer, ethylene-allyl (meth) acrylate-vinyl acetate copolymer Combined, ethylene-allyl (meth) acrylate- (meth) acrylic acid ester copolymer, ethylene-vinyl vinyl (meth) acrylate-
Examples thereof include vinyl acetate copolymers and ethylene- (meth) acrylic acid vinyl- (meth) acrylic acid ester copolymers. These copolymers are preferably those produced by a high pressure radical polymerization method, but are not particularly limited thereto. The copolymer of the present invention includes 70 to 99.99% by weight of ethylene, 0.01 to 30% by weight of a monomer having two or more carbon-carbon unsaturated bonds, and 0 to another unsaturated monomer. ~ 29.9
A copolymer consisting of 9% by weight is preferred. When the amount of the monomer having two or more carbon-carbon unsaturated bonds is less than 0.01, the degree of crosslinking due to irradiation with ionizing radiation is low, and when it exceeds 30% by weight, gel is generated due to thermal crosslinking in the processing step. May cause harmful effects. The type and amount of the other unsaturated monomer are appropriately selected so as to impart other properties such as flexibility of the copolymer.

Component B) in the present invention means a: carboxylic acid group, carboxylic acid ester group or acid anhydride group, b: epoxy group, c: hydroxyl group, d: amino group, e: alkenyl cyclic iminoether group, f: a polyolefin resin having a functional group selected from an unsaturated silane compound, g: a functional group selected from an unsaturated titanate compound, such as a random copolymer or a graft copolymer. Include.

The compound for introducing the carboxylic acid group, the carboxylic acid ester group or the acid anhydride group of the above functional group a is
Α, β-unsaturated dicarboxylic acids such as maleic acid, fumaric acid, citraconic acid and itaconic acid, unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, furanic acid, crotonic acid, vinylacetic acid and pentenoic acid, or these α , Β-unsaturated dicarboxylic acid or unsaturated monocarboxylic acid ester or anhydride, and the like.

B: As a compound for introducing an epoxy group, 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 glycidyl esters or vinyl glycidyl ether, allyl Examples thereof include glycidyl ethers such as glycidyl ether, glycidyloxyethyl vinyl ether, styrene-p-glycidyl ether, p-glycidyl styrene, and the like, and glycidyl methacrylate and allyl glycidyl ether are particularly preferable.

C: 1-hydroxypropyl (meth) acrylate as a compound for introducing a hydroxyl group,
2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate and the like can be mentioned.

D: As a compound for introducing an amino group,
Examples thereof include tertiary amino groups such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate and dibutylaminoethyl (meth) acrylate.

E: The compound introducing an alkenyl cyclic iminoether group is represented by the following structural formula (Formula 1).

[0015]

[Chemical 1]

Here, 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 a C1 to C12 inactive alkyl group and / or hydrogen, and the alkyl group may have an inactive substituent. The term "inert" as used herein means that the graft reaction and the function of the product are not adversely affected. Also, all R need not be the same.
Preferably R ¹ = R ² = H, R ³ = H or Me,
R = H, that is, 2-vinyl and / or 2-isopropenyl-2-oxazoline, 2-vinyl and / or 2
-Isopropenyl-5,6-dihydro-4H-1,3-
It is oxazine. These may be used alone or as a mixture.
Among these, 2-vinyl and / or 2-isopropenyl-2-oxazoline are particularly preferable.

F: Examples of the unsaturated silane compound for introducing a functional group derived from the unsaturated silane compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetylsilane and vinyltrichlorosilane.

G: Tetraisopropyl titanate, tetra-n-butyl titanate, tetrakis (2-ethylhexoxy) titanate, titanium lactate ammonium salt and the like are mentioned as the unsaturated titanate compound introducing a functional group derived from the unsaturated titanate compound. To be

The polyolefin resin or rubber used for the graft modification of the functional group-containing polyolefin resin is not particularly limited, and may be high, medium,
Low density polyethylene, linear low density polyethylene, ultra low density polyethylene, EPR, EPDM, EVA, EEA
And ethylene homopolymers and copolymers, or propylene homopolymers, copolymers with other α-olefins, and the like, and particularly ethylene-α-with a density of 0.91 to 0.97 g / cm ³ . Olefin copolymers are preferably used. Among the polyolefin resins having these functional groups, maleic anhydride-modified polyethylene is most preferable.

The content of the functional group in the case of the graft-modified copolymer is 1 × 10 ^{−3 to} 2.5 mol%, preferably 2 × 10 ^{−3 to} 2.0 mol%. When the content is less than 1 × 10 ⁻³ mol%, the coupling effect between the resin component and the inorganic flame retardant is difficult to be exhibited, while the graft-modified copolymer having an addition amount of more than 2.5 mol% is added. Coalescence is difficult to manufacture. In the case of a random copolymer, 0.5 to 20 mol%, preferably 0.7
Is selected in the range of ˜15 mol%. When the content is less than 0.5 mol%, the coupling effect between the resin component and the inorganic flame retardant is hard to be exhibited, while on the other hand, it is difficult to produce a random copolymer having an addition amount of a concentration exceeding 20 mol%. Not only is it difficult, but the mechanical strength of the composition may be reduced.

The method for producing the graft-modified copolymer of the present invention is obtained by graft-modifying at least one compound having the functional group in the presence of a radical initiator by a melting method or a solution method. Of these, the melting method is the preferred graft modification method. Examples of the radical initiator include organic peroxides, dihydroaromatic compounds,
Examples of the crosslinking agent include dicumyl compounds. Further, in the case of a peroxide decomposable polymer such as polypropylene, etc., the polymer chain is cleaved by the peroxide, so it is preferable to use a dicumyl compound, a dihydroaromatic compound or the like as a relatively gentle crosslinking agent. desirable.

Examples of the organic peroxide include hydroperoxide, dicumyl peroxide, t-butylcumyl peroxide, dialkyl (allyl) peroxide, diisopropylbenzene hydroperoxide, dipropionyl peroxide, dioctanoyl. Peroxide, benzoyl peroxide, peroxysuccinic acid, peroxyketal, 2,5-dimethyl-2,
5 Di (t-butylperoxy) hexane, t-butyloxyacetate, t-butylperoxyisobutyrate and the like are preferably used.

As the dihydroaromatic, dihydroquinoline or its derivative, dihydrofuran, 1,2-dihydrobenzene, 1,2-dihydronaphthalene, 9,10-
Dihydrophenanthrene and the like can be mentioned.

The dicumyl compound is represented by the following structural formula (Formula 2).

[Chemical 2]

The dicumyl compound represented by the above structural formula used herein is 2,3-dimethyl-2,3-diphenylbutane, 2,3-diethyl-2,3-diphenylbutane, 2,3-diethyl-2,3-di (P-Methylphenyl) butane, 2,3-diethyl-2,3-di (p
-Bromophenyl) butane and the like are exemplified, and particularly 2,3-diethyl-2,3-diphenylbutane is preferably used.

Examples of the inorganic flame retardant which is the component C) of the present invention include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, basic magnesium carbonate, dolomite, hydrotalcite, calcium hydroxide, barium hydroxide and oxidation. Hydrate of tin, hydrate of inorganic metal compounds such as borax, zinc borate, zinc metaborate, barium metaborate,
Examples thereof include zinc carbonate, magnesium-calcium carbonate, calcium carbonate, barium carbonate, magnesium oxide, molybdenum oxide, zirconium oxide, tin oxide and red phosphorus. These may be used alone or in combination of two or more. Among these, hydrates of at least one metal compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, basic magnesium carbonate, dolomite, and hydrotalcite, especially aluminum hydroxide and water. Magnesium oxide has a good flame retardant effect,
It is economically advantageous. The particle size of these inorganic flame retardants varies depending on the type, but in the above aluminum hydroxide and magnesium hydroxide, the average particle size is 20 μm.
It is preferably 10 μm or less.

The composition of the present invention contains 30 to 200 parts by weight, preferably 40 to 150 parts by weight, of component C) per 100 parts by weight of the resin component consisting of component A) and component B). The blending amount of the component B) is such that the functional group in the resin component composed of the components A) and B) is 1 × 10 ^{−3 to} 20 mol%.
It is adjusted to be within the range. The functional group is 1 × 10 ^-3
If it is less than mol%, the coupling effect between the resin component and the inorganic flame retardant as the component C) becomes insufficient, resulting in poor mechanical strength and the like. Further, when the content of the functional group is 20 mol% or more, the mechanical strength of the resin composition may decrease. Also C)
When the amount of the inorganic flame retardant as a component is less than 30 parts by weight,
Since it is difficult to make the flame retardant sufficient with the inorganic flame retardant alone, it is necessary to use the organic flame retardant together. On the other hand, when the amount is more than 200 parts by weight, the abrasion resistance is poor, the mechanical strength is lowered such as the impact strength is lowered, the flexibility is lost, and the low temperature characteristics are poor.

In the present invention, by using the above composition and the inorganic filler in combination, the blending amount of the flame retardant can be reduced and other characteristics can be imparted. Examples of the inorganic filler 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, carbon black. , Mica, glass plate, sericite, pyrophyllite, aluminum flakes, graphite, silas paloon, metal paloon, glass paloon, pumice stone, glass fiber, carbon fiber, whiskers, metal fiber, graphite fiber, silicon carbide fiber, asbestos, Wollastonite and the like can be mentioned. These compounding agents are applied up to about 100 parts by weight per 100 parts by weight of the composition of the present invention. If the blending amount exceeds 100 parts by weight, mechanical properties such as impact strength of the molded product deteriorate, which is not preferable.

In the present invention, when the inorganic flame retardant or the inorganic filler is used, the surface of the flame retardant or the filler is stearic acid, oleic acid,
Surface treatment such as coating with a fatty acid such as palmitic acid or a metal salt thereof, paraffin, wax, polyethylene wax, or a modified product thereof, organic silane, organic borane, organic titanate, or the like is preferable.

In the present invention, mineral oil is used as long as it does not impair the physical properties of the composition comprising the ethylene copolymer as component A), the polyolefin resin having a functional group as component B), and the inorganic flame retardant as component C). Wax, paraffin,
A scratch whitening agent such as higher fatty acid and its ester, amide or metal salt, silicone, partial fatty acid ester of polyhydric alcohol or fatty acid alcohol, fatty acid, fatty acid amide, alkylphenol or alkylnaphthol alkylene oxide adduct may be added.

The method of crosslinking the composition of the present invention is not particularly limited, and a crosslinking method using an organic peroxide and a method of irradiating with high-energy radiation such as electron beam, β ray, γ ray. Any method such as a water crosslinking method using a silane compound may be used. The gel fraction of the flame-retardant composition after crosslinking is preferably 50% or more. If it is 50% or less, the effect of improving heat resistance and flame retardancy becomes insufficient. The larger the gel fraction, the larger the effect of improving wear resistance, heat resistance, flame retardancy, etc., and therefore it is preferable. As the cross-linking agent used in the present invention, a cross-linking agent by a free radical mechanism such as the above organic peroxide, a dicumyl compound, a cross-linking agent of natural or synthetic rubber such as sulfur or a sulfur compound, a silane compound, a dihydro compound, etc. are used. be able to.

The amount of these crosslinking agents added is such that the gel fraction is 50.
% Or more. Generally, composition 1
It is used in an amount of 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight, based on 00 parts by weight.

The method for producing the crosslinkable flame-retardant composition of the present invention is not particularly limited and can be produced by a known method. For example, the ethylene copolymer of component A),
Polyolefin resin having functional group of component B), C)
Inorganic flame retardant as a component and, if necessary, a cross-linking agent, a cross-linking aid, an inorganic filler, an additive, etc. are blended, and these are dry blended with an ordinary tumbler, or a Banbury mixer, a pressure kneader, a kneading extrusion. Machine, twin screw extruder,
Roll, or the like, is melt-kneaded with an ordinary kneading machine such as a mill to uniformly disperse the resin composition to produce a mixture or a molded product thereof, which is then crosslinked by heating or water-crosslinking in warm water, or You may cross-link by irradiating an electron beam or high energy radiation. The crosslinked product may be obtained at the same time as producing a mixture of resin compositions or a molded product made of the same by melt-kneading with a conventional kneader and uniformly dispersing.

[0034]

The composition of the present invention comprises an ethylene copolymer as component A), a polyolefin resin having a functional group as component B),
A cross-linkable flame-retardant composition comprising an inorganic flame retardant as component C) and an additive to be added as necessary, wherein the ethylene copolymer as component A) increases the acceptance of the inorganic flame retardant and cross-links. It is efficient and has a role of enhancing the flame retardant effect without lowering the mechanical strength. The polyolefin resin having a functional group of the component B) has a coupling effect between the resin of the component A) and the inorganic flame retardant of the component C), enhances mutual compatibility of the resins, and has high mechanical strength and abrasion resistance. Has the role of improving the heat resistance, heat resistance and workability. The inorganic flame retardant of the component C) has a role of providing a non-halogen flame retardant crosslinked product.

Within the scope of the present invention, organic flame retardants, organic fillers, antioxidants, lubricants, organic or inorganic pigments, UV inhibitors, dispersants, copper damage inhibitors,
You may add a neutralizer, a plasticizer, a nucleating agent, etc.

The present invention includes the following embodiments. (1) The polyolefin resin having a functional group of the component (B) has a density of 0.91 to 0.9 modified with maleic anhydride.
The crosslinkable flame-retardant composition according to claim 1, which is a 7 g / cm ³ ethylene-α-olefin copolymer. (2) The crosslinkable flame retardant composition according to claim 1, wherein the inorganic flame retardant as the component (C) is a hydrate of an inorganic metal compound. (3) The crosslinkable flame retardant composition according to claim 1, wherein the inorganic flame retardant as the component (C) is magnesium hydroxide.

[0037]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited thereto. [Resins and Materials Used] A) Component A-1: Ethylene-allyl methacrylate copolymer (hereinafter referred to as E-
(Referred to as AMA) [AMA content = 1.0 wt%, MFR =
1.0 g / 10 min.] A-2: Ethylene-vinyl methacrylate copolymer (hereinafter referred to as E-
(Referred to as VMA) [VMA content = 1.0 wt%, MFR =
1.0 g / 10 min.] A-3: Ethylene-ethyl acrylate-allyl methacrylate copolymer (hereinafter referred to as E-EA-AMA) [EA content = 10 wt%, AMA content = 1.0 wt%, MFR = 1.0
g / 10 min.] A-4: Ethylene-ethyl acrylate-vinyl methacrylate copolymer (hereinafter referred to as E-EA-VMA) [EA content = 10 wt%, VMA content = 1.0 wt%, MFR = 1. 0
g / 10min.] High pressure low density polyethylene (LDPE): W-2000
[Brand name: Nippon Petrochemical Co., Ltd., MFR = 1.0,
Density 0.920 g / cm ³ ) B) Component B-1: Maleic anhydride-modified ethylene-butene-1 copolymer (hereinafter referred to as MAnLLDPE) [MFR = 1.2 g / 1
0 min. Density = 0.92 g / cm ³ , maleic anhydride addition =
0.17 wt%] B-2: ethylene-glycidyl methacrylate copolymer (E
-Abbreviated as GMA) [MFR = 4.0 g / 10 min. Density =
0.935 g / cm ³ , glycidyl methacrylate = 10 wt
%] B-3: Oxazoline-modified ethylene-butene-1 copolymer [MFR = 3.0 g / 10 min. Density = 0.930 g / cm ³ ,
Oxazoline = 0.2 wt%] C) Component C-1: Magnesium hydroxide [Mg (OH) ₂ ] [Brand name: Kisuma 5J Kyowa Chemical Co., Ltd.] C-2: Aluminum hydroxide [Al (OH) ₃ ] [Product name: Heidilite 42M, manufactured by Nippon Light Metal Co., Ltd.]

(Test method) (1) Tensile test (YTS), (UTS) and elongation (UE
L) (%) A test piece punched with a dumbbell No. 3 from a sheet having a thickness of 1 mm was measured using a Tensilon at a tensile speed of 200 mm / min. (2) Oxygen index (OI) The oxygen index was measured according to JIS K7201. (3) Wear resistance test Using a Taber type wear tester, wear wheels H-22, load 1
Weight loss was measured after testing at Kg, 1000 revolutions. (4) Gel Fraction (%) Dicumyl peroxide [trade name: Park Mill D, manufactured by NOF CORPORATION] 2.0 w%, thiobis (trade name: Nocrac 300, manufactured by Ouchi Shinko Co., Ltd.) 2w% and A) component B)
The components were kneaded with a roll at 120 ° C., and thermally crosslinked for 30 minutes by a press molding machine at 160 ° C., and the sample was crushed to within 35 to 20 mesh and extracted with xylene at 120 ° C. for 10 hours to obtain a residual rate. (5) Heat resistance (heat deformation rate) The heat resistance was measured according to JIS C3005. Temperature 120 ℃,
It was measured with a load of 1 kg.

(Examples 1 to 7) After the compositions having the formulations shown in Table 1 were dry blended, they were melt-kneaded at a resin temperature of 200 ° C. using a 50 mmφ extruder and pelletized. 1 more
A sample was prepared by press molding at 80 ° C., a pressure of 100 kg / cm ² , and a time of 5 minutes, and used for the test. The test results are shown in Table 1. In the same manner as in Example 2 and the following, a sample was prepared with the composition shown in Table 1 and subjected to the test. As test items, MFR, tensile strength, elongation, oxygen index, gel fraction, heat resistance (heat deformation rate), abrasion resistance and the like were measured (however, the gel fraction was measured without adding a flame retardant. ) The results are shown in Table 1.

(Comparative Example 1) The LD in which the component (A) is out of the range.
A sample piece was prepared in the same manner as in the example except that PE was used. The results are shown in Table 2.

(Comparative Example 2) A sample piece was prepared in the same manner as in the Example except that the blending amount of the component C) was out of the range. The results are shown in Table 2.
Shown in.

(Comparative Example 3) A sample piece was prepared in the same manner as in Example except that the component B) was not used. The results are shown in Table 2.

(Comparative Example 4) A sample piece was prepared in the same manner as in the Example except that the blending amount of the component C) was out of the range. The results are shown in Table 2.
Shown in.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

EFFECTS OF THE INVENTION As described above, the present invention relates to A) an ethylene copolymer having a carbon-carbon unsaturated bond, B) a polyolefin resin containing a functional group, and C) an inorganic flame retardant. Alternatively, it further provides a crosslinkable flame-retardant composition obtained by blending various additives as required.
The crosslinkable flame-retardant composition of the present invention has a high degree of flame retardancy, does not generate a toxic gas such as a halogen gas during combustion, is excellent in wear resistance and heat resistance, and is safe and flexible, It has excellent processability, mechanical properties, chemical resistance, and electrical properties, so it is used for molding applications such as extrusion molded products such as films, sheets, pipes, injection molded products, and for electric wires and cables. It is utilized in various fields such as textiles, electricity, electronics, automobiles, ships, aircraft, construction, and civil engineering.

Claims (2)

[Claims] 1. A) an ethylene copolymer having a carbon-carbon unsaturated bond and B) a polyolefin resin or rubber having a functional group selected from the following a to g,
A) A crosslinkable flame retardant composition containing 100 parts by weight of a resin component having functional groups in the resin component of 1 × 10 ^{−3 to} 20 mol%, and C) 30 to 200 parts by weight of an inorganic flame retardant. a: carboxylic acid group, carboxylic acid ester group or acid anhydride group, b: epoxy group, c: hydroxyl group, d: amino group, e: alkenyl cyclic iminoether group f: functional group derived from unsaturated silane compound g : Functional group derived from unsaturated titanate compound 2. The ethylene copolymer having a carbon-carbon unsaturated bond of component A) according to claim 1, is ethylene 7
Copolymer comprising 0 to 99.99% by weight, 0.01 to 30% by weight of a monomer having two or more carbon-carbon unsaturated bonds, and 0 to 29.99% by weight of another unsaturated monomer. The crosslinkable flame-retardant composition according to claim 1.