JP2002256117A - Resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition which does not generate a harmful gas, is excellent in flame retardance, and can be used as an electric wire covering material excellent in initial tensile strength, weather resistance, and electrical properties. SOLUTION: This composition is prepared by compounding 100 pts.wt. polyolefin resin with 10-350 pts.wt. magnesium hydroxide and/or aluminum hydroxide and 0.1-20 pts.wt. polyester plasticizer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition, and more particularly, to a resin composition containing magnesium hydroxide and / or aluminum hydroxide and a polyester plasticizer in a polyolefin resin, which generates harmful gas. The present invention relates to a resin composition having excellent flame retardancy, initial tensile strength, and weather resistance.

[0002]

2. Description of the Related Art Electronic computers, office automation equipment, electric wires for industrial equipment such as vehicles, consumer electronic equipment such as audio, video and personal computers, indoor wiring, etc., are harmful to combustion. It is required to have high flame retardancy without generating gas. Accordingly, it has been required that these electric wires have high flame retardancy without generating harmful gas during combustion. As a flame-retarding method that meets such demands, a method is known in which a large amount of magnesium hydroxide, which is a non-halogen flame retardant, is added to a thermoplastic resin such as polyolefin.

However, a flame-retardant resin composition obtained by adding a large amount of magnesium hydroxide to a thermoplastic resin such as polyolefin has a low initial tensile strength when applied to an insulated wire or an insulated tube, and is exposed to outdoors. There was a problem that the subsequent physical properties were significantly reduced.

[0004] Therefore, there is a need to develop a resin composition which does not generate harmful gas, has excellent flame retardancy, and can be used as a wire covering material having excellent initial tensile strength, weather resistance and electrical properties. Was.

Accordingly, an object of the present invention is to provide a resin composition which does not generate harmful gas, has excellent flame retardancy, and can be used as an electric wire covering material having excellent initial tensile strength, weather resistance and electrical properties. To provide.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to improve the above-mentioned drawbacks. As a result, magnesium hydroxide and / or aluminum hydroxide and a polyester plasticizer were added to a polyolefin resin. Have been found to be able to obtain a resin composition which has no harmful gas, has excellent flame retardancy, and has excellent initial tensile strength, weather resistance, and electrical properties by being added together. did.

That is, the present invention relates to (b) 10 to 350 parts by weight of magnesium hydroxide and / or aluminum hydroxide, and (c) polyester plasticizer 0.1 per 100 parts by weight of polyolefin resin. The present invention provides a resin composition consisting of up to 20 parts by weight.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the flame-retardant resin composition of the present invention will be described in detail.

The (a) polyolefin resin used in the present invention is a polymer containing ethylene or propylene as a main component. Examples of ethylene polymers include ethylene homopolymers such as high-pressure polyethylene, linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE); ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-
Methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer (EEA), ethylene-ethyl methacrylate copolymer,
Ethylene-vinyl alcohol copolymers and the like. Examples of the propylene-based polymer include a propylene homopolymer obtained by polymerizing propylene using a known α-olefin stereoregular catalyst such as a Ziegler-Natta catalyst. Combined or propylene as the main component, propylene and other α
A random copolymer with an olefin, for example, ethylene, butene-1, 4-methylpentene-1, hexene-1, heptene-1, octene-1, etc., specifically, a propylene homopolymer, ethylene- Propylene copolymer,
Examples thereof include propylene-butene-1 copolymer and ethylene-propylene-butene-1 terpolymer.

Among these polyolefin resins, various mechanical properties can be obtained by using an ethylene polymer, especially an ethylene homopolymer or a blend of an ethylene homopolymer and an ethylene vinyl acetate copolymer (EVA). It is preferable because an excellent resin composition can be obtained.

The magnesium hydroxide and / or aluminum hydroxide used in the present invention may be any one which is generally used as a flame retardant, but has an average particle diameter of 0.1 to 15 μm. , Preferably 0.5 to
3 μm, and the specific surface area by the BET method is 1 to 2
0 m ² / g, preferably those of 3 to 8 m ² / g. Commercially available magnesium hydroxide has been previously surface-treated with a surfactant such as sodium stearate and sodium lauryl sulfonate to improve dispersibility and fluidity. Particularly, magnesium hydroxide is preferable because it has a higher decomposition temperature than aluminum hydroxide and thus has a low possibility of foaming during the production of a molded article.

The amount of the magnesium hydroxide and / or aluminum hydroxide used is determined by the amount of the polyolefin resin 10
10 to 350 parts by weight, preferably 80 parts by weight per 0 parts by weight
When the amount is less than 10 parts by weight, the flame-retardant effect cannot be imparted. When the amount exceeds 350 parts by weight, the fluidity of the molded article decreases. This is not preferable because the rigidity, dimensional stability, impact strength and the like of the molded product are reduced.

The polyester plasticizer used in the present invention is obtained from a stopper such as a polybasic acid and a polyhydric alcohol, and if necessary, a monobasic acid and a monohydric alcohol.

As the polybasic acid, for example, aliphatic dibasic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, azelaic acid and dodecanedicarboxylic acid are used alone or in combination. In addition, use a small proportion of aromatic polybasic acids such as phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, and pyromellitic acid, or aliphatic polybasic acids such as butanetricarboxylic acid, tricarballylic acid, and citric acid. Can also.

Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, and 2,2-diethyl-
1,3-propanediol, 1,2-butanediol,
1,3-butanediol, 1,4-butanediol,
1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 3-methyl-1,5-
Aliphatic glycols such as pentanediol, 2-ethyl-1,3-hexanediol, and 2,2,4-trimethyl-1,3-pentanediol are used alone or as a mixture. Polyhydric alcohols such as glycerin, trimethylolpropane, trimethylolethane, and pentaerythritol can also be used.

The monobasic acid used as a stopper includes, for example, acetic acid, lactic acid, stearyl lactic acid, caproic acid, pelargonic acid, lauric acid, 2-ethylhexylic acid, myristic acid, palmitic acid, undecylenic acid, ricinoleic acid Linoleic acid, linoleic acid, neodecanoic acid, oleic acid, stearic acid, isodecanoic acid, isostearic acid, 12-hydroxystearic acid, 12
-Ketostearic acid, chlorostearic acid, phenylstearic acid, arachinic acid, behenic acid, erucic acid, brassic acid and similar acids, and tallow fatty acids, coconut oil fatty acids, tung oil fatty acids, soybean oil fatty acids and cottonseed oil fatty acids. Mixtures of the above naturally occurring acids such as benzoic acid, chlorobenzoic acid, toluic acid, salicylic acid, p-tert-butylbenzoic acid, 5-tert-octylsalicylic acid, naphthenic acid,
Xylic acid, ethylbenzoic acid, isopropylbenzoic acid,
Di-tert-butylbenzoic acid, bromobenzoic acid and the like.

Examples of the monohydric alcohol include methanol, ethanol, propanol, isopropanol, butanol, secondary butanol, isobutanol, hexanol, isohexanol, heptanol, isoheptanol, octanol, isooctanol, 2-ethylhexanol, and the like. Nonyl alcohol, isononyl alcohol, decanol, isodecanol, undecanol, isoundecanol, dodecanol, 2-butyloctanol, tridecyl alcohol, isotridecyl alcohol, 2-butyldecanol, 2-hexyloctanol, 2-hexyldecanol, 2 -Octyldecanol, 2-hexyldodecanol, 2-octyldodecanol, 2-decyltetradecanol, benzyl alcohol and the like alone It used in mixing.

The polyester plasticizer can be produced by a known method. For example, in the presence of a catalyst such as dibutyltin oxide or tetraalkyl titanate,
It can be produced using the polybasic acid, the polyhydric alcohol, and the terminal stopper component. The ratio of the above components used in the production varies depending on the type of the components used, the properties of the target polyester plasticizer, the molecular weight, and the like. Alcohol 10 to 80% by weight and terminal stopper component 1
It is used in a proportion of 50% by weight.

It is preferable to use an adipic acid-based polyester plasticizer using adipic acid as a dibasic acid component among the above-mentioned polyester-based plasticizers, since a particularly excellent weather resistance can be obtained.

The polyester plasticizer preferably has an acid value (AV) of 1 mgKOH / g or less, and a hydroxyl value (OHV) of 30 mgKOH / g or less.

Preferred examples of the polyester plasticizer used in the present invention will be specifically described below.

[0022]

[Table 1]

The amount of the polyester plasticizer used in the present invention is 0.1 to 20 parts by weight, preferably 1 to 15 parts by weight, based on 100 parts by weight of the polyolefin resin. If the addition amount is less than 0.1 part by weight, no use effect is exhibited, and if it exceeds 20 parts by weight, physical properties may be deteriorated, which is not preferable.

Further, the resin composition of the present invention may further contain various additives used as usual additives for olefin resin fats, for example, phosphorus-based, phenol-based or sulfur-based antioxidants, and ultraviolet absorbers. Agents, hindered amine light stabilizers, organosilicon compounds, and the like.

The above-mentioned phosphorus antioxidants include, for example,
Liphenyl phosphite, tris (2,4-ditert-butyl)
Ruphenyl) phosphite, tris (nonylphenyl)
Phosphite, tris (dinonylphenyl) phosphite
G, tris (mono and di mixed nonylphenyl) phosphite
G, bis (2-tert-butyl-4,6-dimethylphenyi)
E) Ethyl phosphite, diphenyl acid phosphite
2,2′-methylenebis (4,6-ditert-butyl)
Ruphenyl) octyl phosphite, diphenyldecyl
Phosphite, phenyldiisodecyl phosphite,
Libutyl phosphite, tris (2-ethylhexyl)
Phosphite, tridecyl phosphite, trilauryl
Phosphite, dibutyl acid phosphite, dilau
Lil acid phosphite, trilauryl trithiophos
Fight, bis (neopentyl glycol) 1,4-
Cyclohexanedimethyldiphosphite, bis (2,4-
Di-tert-butylphenyl) pentaerythritol diphosph
And bis (2,6-ditert-butyl-4-methylphen)
Nyl) pentaerythritol diphosphite, distear
Rylpentaerythritol diphosphite, phenyl-
4,4'-isopropylidene diphenol pentaery
Thritol diphosphite, tetra (C₁₂~ C ₁₅Mixed
Alkyl) -4,4'-isopropylidenediphenylphosph
Phyto, bis [2,2'-methylenebis (4,6-di
Amylphenyl)] • isopropylidenediphenylphosph
Aite, hydrogenated-4,4'-isopropylidene dipheno
Polyphosphite, bis (octylphenyl)
[4,4'-n-butylidenebis (2-tert-butyl-
5-methylphenol)] ・ 1,6-hexanediol ・
Diphosphite, tetratridecyl-4,4'-butylene
Denbis (2-tert-butyl-5-methylphenol) di
Phosphite, hexa (tridecyl) -1,1,3-to
Lis (2-methyl-5-tert-butyl-4-hydroxyphenyl)
Enyl) butane triphosphonite, 9,10-dihi
Dro-9-oxa-10-phosphaphenanthrene-1
0-oxide, 2-butyl-2-ethylpropanedio
2,4,6-tri-tert-butylphenol monophos
Fight and the like.

Examples of the phenolic antioxidants include 2,6-di-tert-butyl-p-cresol and 2,6-di-tert-butyl-p-cresol.
Diphenyl-4-octadecyloxyphenol, stearyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, distearyl (3,5-di-tert-butyl-4-hydroxybenzyl) phosphonate, tridecyl-3,3 5-di-tert-butyl-4-hydroxybenzylthioacetate, thiodiethylenebis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 4,4'-thiobis (6-tert-butyl-m -Cresol), 2-octylthio-4,6-di (3,5-ditert-butyl-4-hydroxyphenoxy) -s-triazine, 2,2'-methylenebis (4-methyl-6-tert-butylphenol) , Bis [3,3-bis (4-hydroxy-3-tert-butylphenyl) butyric acid]
Glycol ester, 4,4'-butylidenebis (4,
6-di-tert-butylphenol), 2,2′-ethylidenebis (4,6-di-tert-butylphenol), 1,1,3
-Tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, bis [2-tert-butyl-4-methyl-6- (2-hydroxy-3-tert-butyl-5-methylbenzyl) Phenyl] terephthalate, 1,3,5-
Tris (2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl)
Isocyanurate, 1,3,5-tris (3,5-ditert-butyl-4-hydroxybenzyl) -2,4,6-trimethylbenzene, 1,3,5-tris [(3,5-di-tert. Tributyl-4-hydroxyphenyl) propionyloxyethyl] isocyanurate, tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, 2-tert-butyl-4-methyl- 6- (2-Acroyloxy-3-tert-butyl-
5-methylbenzyl) phenol, 3,9-bis [2-
(3-tert-butyl-4-hydroxy-5-methylhydrocinnamoyloxy) -1,1-dimethylethyl]-
2,4,8,10-tetraoxaspiro [5.5] undecane] and triethylene glycol bis [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate].

Examples of the sulfur-based antioxidants include dialkylthiodipropionates such as dilauryl, dimyristyl, myristylstearyl and distearyl esters of thiodipropionic acid, and pentaerythritol tetra (β-dodecylmercaptopropionate). And β-alkyl mercaptopropionates of polyols.

As the above-mentioned ultraviolet absorber, for example,
4-dihydroxybenzophenone, 2-hydroxy-4
-Methoxybenzophenone, 2-hydroxy-4-oct
Toxicbenzophenone, 2-hydroxy-4-tert-butyl
-4 '-(2-methacryloyloxyethoxyethoxy)
B) Benzophenone, 5,5'-methylenebis (2-h
2-hydrides such as droxy-4-methoxybenzophenone)
Roxybenzophenones; 2- (2-hydroxy-5-
Methylphenyl) benzotriazole, 2- (2-hydr)
Roxy-5-tert-octylphenyl) benzotriazolate
2- (2-hydroxy-3,5-ditert-butylphenyl)
Nyl) -5-chlorobenzotriazole, 2- (2-h
Droxy-3-tert-butyl-5-methylphenyl) -5
-Chlorobenzotriazole, 2- (2-hydroxy-
3-dodecyl-5-methylphenyl) benzotriazole
2- (2-hydroxy-3-tert-butyl-5-C₇
~ C ₉Mixed alkoxycarbonylethylphenyl) tri
Azole, 2- (2-hydroxy-3,5-dicumylph)
Enyl) benzotriazole, 2,2'-methylenebis
(4-tert-octyl-6-benzotriazolylphenol
), 2- (2-hydroxy-3-tert-butyl-5-ca)
(Roxyphenyl) benzotriazole polyethylene
2- (2-hydroxyphenyl) such as glycol ester
B) benzotriazoles; 2- (2-hydroxy-4)
-Hexyloxyphenyl) -4,6-diphenyl-1,
3,5-triazine, 2- (2-hydroxy-4-methoate
(Xyphenyl) -4,6-diphenyl-1,3,5-to
Liazine, 2- (2-hydroxy-4-octoxyfe)
Nyl) -4,6-bis (2,4-dimethylphenyl)-
1,3,5-triazine, 2- (2-hydroxy-4-
Acryloyloxyethoxyphenyl) -4,6-bis
(2,4-dimethylphenyl) -1,3,5-triazi
2- (2-hydroxyphenyl) -1,3,5-
Triazines; phenyl salicylate, resorcinol
Monobenzoate, 2,4-ditert-butylphenyl-
3,5-di-tert-butyl-4-hydroxybenzoate,
2,4-di-tert-amylphenyl-3,5-di-tert-butyl
-4-hydroxybenzoate, hexadecyl-3,5
-Benzenes such as di-tert-butyl-4-hydroxybenzoate
Zoates; 2-ethyl-2'-ethoxyoxanil
Or 2-ethoxy-4'-dodecyloxanilide or the like
Substituted oxanilides; ethyl-α-cyano-β, β-dif
Phenyl acrylate, methyl-2-cyano-3-methyl
Shears such as -3- (p-methoxyphenyl) acrylate
And a nonacrylate.

Examples of the hindered amine light stabilizer include, for example, 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, , 2,6,6-tetramethyl-4-piperidylbenzoate, bis (2,
2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis (1-octoxy-2,
2,6,6-tetramethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-)
Piperidyl) -1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, bis ( 2,2,6,6-tetramethyl-4-piperidyl) .bis (tridecyl) -1,
2,3,4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) bis (tridecyl) -1,2,3,4-butanetetracarboxylate, bis ( 1,2,2,6,6-pentamethyl-4-piperidyl) -2-butyl-2-
(3,5-di-tert-butyl-4-hydroxybenzyl) malonate, 1- (2-hydroxyethyl) -2,2,
6,6-tetramethyl-4-piperidinol / diethyl succinate polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / dibromoethane polycondensate, 1, 6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / 2,4
-Dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4
-Piperidylamino) hexane / 2,4-dichloro-6
Tertiary octylamino-s-triazine polycondensate, 1,
5,8,12-tetrakis [2,4-bis (N-butyl-N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -s-triazin-6-yl] -1, 5,
8,12-tetraazadodecane, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (1,2,2
2,6,6-pentamethyl-4-piperidyl) amino)
-S-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,6,11-tris [2,4-bis (N-butyl-N- (2,2,6,6 -Tetramethyl-4-piperidyl) amino-s-triazin-6-ylamino] undecane, 1,6,11-tris [2,4-
Bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino-s-triazine-6
-Ylamino] undecane, 3,9-bis [1,1-dimethyl-2- {tris (2,2,6,6-tetramethyl-4-piperidyloxycarbonyloxy) butylcarbonyloxy} ethyl] -2,4 , 8,10-Tetraoxaspiro [5.5] undecane, 3,9-bis [1,
1-dimethyl-2- {tris (1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyloxy)
Butylcarbonyloxydiethyl] -2,4,8,10
-Tetraoxaspiro [5.5] undecane and the like.

Examples of the organosilicon compound include γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-methacryloxypropyldimethoxymethylsilane, γ-methacryloxy. Propyldimethylchlorosilane and the like can be exemplified.

In addition, the resin composition of the present invention may further contain, if necessary, additives usually used for polyolefin resins, such as fillers, coloring agents, crosslinking agents, antistatic agents,
Plate-out inhibitor, surface treatment agent, lubricant, flame retardant, fluorescent agent, fungicide, bactericide, metal deactivator, mold release agent, pigment, processing aid, antioxidant, light stabilizer, foaming agent Etc. can be blended.

The resin composition of the present invention can be used irrespective of the processing method, for example, calendering, roll processing, extrusion molding, melt rolling, pressure molding, paste processing. It can be suitably used for powder molding, foam molding and the like.

The resin composition of the present invention includes building materials such as wall materials, floor materials, window frames, and wallpaper; electric wire coating materials; interior and exterior materials for automobiles; agricultural materials such as houses and tunnels; Food packaging material; can be used as miscellaneous goods such as paints, hoses, pipes, sheets, toys, etc., and is particularly suitable for use as an electric wire covering material such as electric wires and cables.

Conventional methods for producing an electric wire covering material using the resin composition of the present invention include a single-screw extruder, a multi-screw extruder, a Banbury mixer, a roll, a kneader, and a heatable Henschel mixer type high-speed fluid mixer. And the like, and can be produced by melt-kneading various components at a temperature not lower than the melting point of the thermoplastic resin.

The use of the resin composition of the present invention is effective when applied to insulated wires (including cables) and insulated tubes because of its excellent flame retardancy, heat aging resistance, and high initial tensile strength and electrical properties. In addition, it is useful for various molded parts and the like in fields requiring high flame retardancy.

In particular, to produce an insulated wire from the resin composition of the present invention, a technique such as extrusion coating is applied on a core conductor to form a coating layer made of the above resin composition, and then an electron beam or the like. It is manufactured by applying ionizing radiation. In addition, in order to manufacture an insulating tube, particularly a heat-shrinkable insulating tube, the resin composition is formed into a tube, irradiated with ionizing radiation such as an electron beam, and then heated to a temperature higher than the softening point of the tube. It is manufactured by expanding in the radial direction by applying internal pressure and cooling and fixing.

[0037]

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited by the following examples.

[Examples 1-1 to 1-5 and Comparative Example 1-1]
~ 1-4] The following components are pre-kneaded with a Banbury mixer, rolled at 140 ° C and 20 rpm for 10 minutes, and the obtained sheet is pressed at 170 ° C for 5 minutes to form a pressed sheet. Then, a specified test piece was prepared from the obtained press sheet, and the following evaluation was performed.

Using the obtained test piece, JIS K7
A tensile test was performed according to No. 118, and the breaking strength (MPa) and elongation (%) were measured. In addition, a tensile test was similarly performed on a test piece whose deterioration was accelerated for 216 hours by a sunshine weatherometer at 63 ° C. with rain. Tables 2 and 3 show these results.

(Blending) parts by weight ・ Linear low-density polyethylene resin 100 (Novatec LL UF240) ・ Magnesium hydroxide (Kisuma 5A) 100 ・ Tetrakis (3-4-hydroxy-3,5-ditert. 0.5 butyl) Phenyl) propionyloxymethyl) methane ・ salicyloylaminotriazole 0.2 ・ bis (2,2,6,6-tetramethyl-4-0.2 piperidyl) sebacate ・ 2- (2-hydroxy-3,5- Di-tert-butyl 0.2 phenyl) -5-chlorobenzotriazole Test compounds Tables 2 and 3

[0041]

[Table 2]

[0042]

[Table 3]

[Examples 2-1 to 2-5 and Comparative Example 2-1]
~ 2-4] The following components are pre-kneaded with a Banbury mixer, roll-processed at 140 ° C and 20 rpm for 10 minutes, and the obtained sheet is pressed at 170 ° C for 5 minutes to form a press sheet. Then, a specified test piece was prepared from the obtained press sheet, and the following evaluation was performed.

Using the obtained test piece, JIS K7
A tensile test was performed according to No. 118, and the breaking strength (MPa) and elongation (%) were measured. In addition, a tensile test was similarly performed on a test piece whose deterioration was accelerated for 216 hours by a sunshine weatherometer at 63 ° C. with rain. Tables 4 and 5 show these results.

(Blending) parts by weight ・ Linear low-density polyethylene resin 80 (Novatec LL UF240) ・ Ethylene-vinyl acetate copolymer 20 (manufactured by Nippon Unicar; PES-400) ・ Magnesium hydroxide (Kisuma 5A) 100 ・ Tetrakis (3-4-hydroxy-3,5-ditertiary 0.5 butylphenyl) propionyloxymethyl) methane ・ salicyloylaminotriazole 0.2 ・ bis (2,2,6,6-tetramethyl-4-) 0.2 piperidyl) sebacate 2- (2-hydroxy-3,5-di-tert-butyl 0.2 phenyl) -5-chlorobenzotriazole Test compounds Tables 4 and 5

[0046]

[Table 4]

[0047]

[Table 5]

As is clear from Tables 2 to 5, when the polyester-based plasticizer is not used, elongation is small and lacks flexibility (Comparative Examples 1-4 and 2-4).
When a general-purpose plasticizer such as dioctyl phthalate, dioctyl adipate, or liquid paraffin is used instead of the polyester plasticizer, the elongation is improved,
Breakdown strength and elongation are remarkably reduced after accelerating weather resistance (Comparative Examples 1-1 to 1-3 and 2-1 to 2-3).

On the other hand, when a polyester-based plasticizer is used as in the present invention, the elongation is improved, and the decrease in breaking strength and elongation is small even after the promotion of weather resistance (Example 1). -1 to 1-5 and 2-1 to 2-
5).

[0050]

The resin composition of the present invention has excellent flame retardancy,
Because of its excellent mechanical properties and weather resistance, it can be applied to various uses, and is particularly suitable for electric wire coating materials.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01B 3/44 H01B 3/44 P 7/295 7/34 B (72) Inventor Takeshi Nishiyama Urawa-shi, Saitama 5-2-1-3 Shirahata Asahi Denka Kogyo Co., Ltd. F-term (reference) 4J002 BB031 BB051 BB061 BB071 BB081 BB121 BB171 BB221 CF032 DE076 DE146 EE030 EH017 EJ010 EU170 EU180 EV060 EW040 EX030 FD022 AFD12 030 CB17 CD06 5G305 AA02 AA11 AA14 AB25 AB28 BA14 BA15 CA01 CC03 CD17 DA16 5G315 CA03 CB01 CB06 CC08 CD02 CD04 CD14

Claims (7)

[Claims] 1. (b) 10 to 350 parts by weight of magnesium hydroxide and / or aluminum hydroxide and (c) 0.1 to 20 parts by weight of a polyester plasticizer with respect to 100 parts by weight of a polyolefin resin. A resin composition comprising: 2. The resin composition according to claim 1, wherein (a) the polyolefin resin is an ethylene polymer. 3. The polyolefin resin (A) 100
The resin composition according to claim 1 or 2, comprising 80 to 300 parts by weight of (b) magnesium hydroxide and / or aluminum hydroxide based on part by weight. 4. The resin composition according to claim 1, wherein the (b) magnesium hydroxide and / or aluminum hydroxide is magnesium hydroxide. 5. The method according to claim 1, wherein the polyester plasticizer has an acid value of 1 mg KOH / g or less and a hydroxyl value of 30 mg KOH / g.
The resin composition according to claim 1, wherein: 6. The resin composition according to claim 1, wherein (c) the polyester plasticizer is an adipic acid polyester plasticizer. 7. The method according to claim 1, which is used for covering an electric wire.
The resin composition according to any one of the above.