JP2001059047A - Vinyl chloride resin composition for wire-coating use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vinyl chloride resin composition for wire-coating use having low toxicity, causing little clogging of filter in processing and having suppressed blooming tendency. SOLUTION: The objective vinyl chloride resin for wire-coating use is produced by compounding 100 pts.wt. of a vinyl chloride resin with (A) 0.05-10 pts.wt. of a hydrotalcite compound expressed by general formula MgX1ZX2A 12(OH)2X1+2X2+4CO3.mH2O(X1 and X2 are each a number satisfying the formulas 0<=X2/X1<10, 2<=X1+X2<20) and (B) 0.001-2 pts.wt. of magnesium hydroxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a vinyl chloride resin composition for covering electric wires, which is stabilized by blending a specific stabilizer, and more specifically, to a method in which a hydrotalcite compound and magnesium hydroxide are added together. Accordingly, the present invention relates to a vinyl chloride resin composition for covering electric wires having improved workability and bloom during processing.

[0002]

2. Description of the Related Art Vinyl chloride resins have excellent electrical insulation, arc resistance, tracking resistance, and voltage resistance. Therefore, it is very important as an insulating material. However, the vinyl chloride resin deteriorates in various excellent properties due to thermal and oxidative deterioration, and is practically unusable.

[0003] In order to make up for the above-mentioned disadvantages, various stabilizers have been conventionally added to vinyl chloride resin insulation materials, and among them, lead stabilizers such as tribasic lead sulfate and lead stearate are particularly awarded. It had been. These stabilizers are excellent heat stabilizers and have advantages such as relatively low cost. However, lead-based stabilizers are highly toxic and do not have sufficient electrical insulation properties. In addition, they also have the drawback that the electrical insulation properties decrease as the temperature of the insulator increases.

For this reason, JP-A-52-77157 and JP-A-52-77158 disclose a basic inorganic acid salt or a calcined product thereof without using a lead-based stabilizer. Have been attempted, but are still insufficient. Also, JP-A-9-32408
No. 8 describes that hydrotalcite and calcium hydroxide are used in combination for electric wire use,
Although the heat stability and the coloring resistance are improved, there is a problem that the filter is clogged during processing.

In Japanese Patent Application Laid-Open No. 63-46248, it has been proposed to use a hydrotalcite compound and magnesium oxide in combination in order to improve foamability during molding. There was no. Japanese Patent Application Laid-Open No. 2-245045 proposes to use a hydrotalcite compound and magnesium hydroxide in combination to improve the transparency, heat retention and slip properties of agricultural films. There was no description.

Accordingly, it is an object of the present invention to provide a vinyl chloride resin composition for covering electric wires, which has low toxicity, does not easily cause clogging of a filter during processing, and suppresses bloom.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventors have remarkably improved processability and bloom by adding a hydrotalcite compound and magnesium hydroxide to a vinyl chloride resin in combination. They found that they could do so and found that the above objective could be achieved.

The present invention has been made on the basis of the above findings, and 100 parts by weight of a vinyl chloride resin contains (a) at least one kind of hydrotalcite compound represented by the following general formula (1): An object of the present invention is to provide a vinyl chloride resin composition for covering electric wires, which comprises 0.001 to 2 parts by weight of (b) magnesium hydroxide and (b) magnesium hydroxide.

Mg _X1 Zn _X2 Al ₂ (OH) _{2X1 + 2X2 + 4} CO ₃ .mH ₂ O (1) (wherein, X 1 and X 2 each represent a number satisfying a condition represented by the following formula, and m Represents 0 or any positive number, 0 ≦ X
2 / X1 <10, 2 ≦ X1 + X2 <20)

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The vinyl chloride resin composition for coating electric wires of the present invention will be described in detail below.

The hydrotalcite compound (a) used in the present invention is a double salt compound comprising magnesium and aluminum or zinc, magnesium and aluminum as represented by the above general formula (1). Alternatively, dehydrated water of crystallization may be used.

The hydrotalcite compound may be a natural product or a synthetic product. The method for synthesizing the synthetic product is described in JP-B-46-2280, JP-B-50-30039, and JP-B-51-29129.
JP, JP-B-3-36839, JP-A-61-1
A known method described in, for example, Japanese Patent No. 74270 can be exemplified. Further, the hydrotalcite compound can be used without being limited by its crystal structure, crystal particle diameter, and the like.

As a specific example of the synthetic product, Mg _4.5 Al
₂ (OH) ₁₃ CO ₃ .3.5H ₂ O (manufactured by Kyowa Chemical; DH
T-4), Mg ₆ Al ₂ (OH) ₁₆ CO ₃ .4H ₂ O
(Manufactured by Kyowa Chemical; DHT-6), Mg ₄ Al ₂ (OH) ₁₂
CO ₃ .3H ₂ O (manufactured by Wako Chemical; Alkamizer 1), M
g ₄ Al ₂ (OH) ₁₂ CO ₃ (manufactured by Kyowa Chemical; Alkamizer 2), Mg ₃ ZnAl ₂ (OH) ₁₂ CO ₃ .3H ₂
O (manufactured by Kyowa Chemical; Alkamizer 4), Mg _3.5 Zn
_0.5 Al ₂ (OH) ₁₂ CO ₃ .3H ₂ O (manufactured by Kyowa Chemical;
Alkamizer 7) and the like.

[0014] The hydrotalcite compound may have a surface formed of a higher fatty acid such as stearic acid, a higher fatty acid metal salt such as an alkali metal oleate, or an organic metal sulfonate such as an alkali metal dodecylbenzenesulfonate. Those coated with higher fatty acid amides, higher fatty acid esters or waxes can also be used.

The amount of the hydrotalcite compound is 0.05 to 100 parts by weight of the vinyl chloride resin.
It is 10 parts by weight, preferably 0.1 to 5 parts by weight. Here, when the compounding amount is less than 0.05 parts by weight, almost no effect is seen, and when the compounding amount is more than 10 parts by weight,
Not only does it have no weight gain effect,
Foaming occurs.

The amount of the magnesium hydroxide (b) used in the present invention is 0.001-2 parts by weight, preferably 0.01-2.0 parts by weight, per 100 parts by weight of the vinyl chloride resin.
1 part by weight. Here, when the compounding amount is less than 0.001 part by weight, almost no effect is observed, and when the compounding amount is more than 2 parts by weight, not only the effect of increasing the amount but also large coloring or foaming is not caused. Will happen.

The vinyl chloride resin used in the present invention is not particularly limited to a polymerization method such as bulk polymerization, solution polymerization, suspension polymerization and emulsion polymerization. Examples thereof include polyvinyl chloride, chlorinated polyvinyl chloride, and the like. , Polyvinylidene chloride, chlorinated polyethylene, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer, vinyl chloride-isobutylene copolymer, Vinyl chloride-vinylidene chloride copolymer, vinyl chloride-styrene-maleic anhydride terpolymer, vinyl chloride-styrene-acrylonitrile terpolymer, vinyl chloride-butadiene copolymer, vinyl chloride-isoprene copolymer , Vinyl chloride-chlorinated propylene copolymer, vinyl chloride-vinylidene chloride-vinyl acetate terpolymer, salt Chlorine-containing resins such as vinyl-maleic acid ester copolymer, vinyl chloride-methacrylic acid ester copolymer, vinyl chloride-acrylonitrile copolymer, vinyl chloride-various vinyl ether copolymers, and their mutually blended products or the like Chlorine-containing resin and another chlorine-free synthetic resin such as acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene terpolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl (meth) acrylate copolymer Polymer,
Examples thereof include blends with polyester and the like, block copolymers, graft copolymers, and the like.

Further, the composition of the present invention comprises a carboxylic acid,
Metals of organic phosphoric acids or phenols (Li, Na,
K, Ca, Ba, Mg, Sr, Zn, Cd, Sn, C
s, Al, organic Sn) salts can be added. Examples of the carboxylic acid include caproic acid, caprylic acid, perargonic acid, 2-ethylhexylic acid, capric acid, neodecanoic acid, undecylenic acid, lauric acid, and myristin. acid,
Palmitic acid, stearic acid, isostearic acid, 12
-Hydroxystearic acid, chlorostearic acid, 12
-Ketostearic acid, phenylstearic acid, ricinoleic acid, linoleic acid, linoleic acid, oleic acid, arachinic acid, behenic acid, erucic acid, brassic acid and similar acids and tallow fatty acids, coconut oil fatty acids, tung oil fatty acids, soy oil fatty acids and A mixture of the above naturally occurring acids such as cottonseed oil fatty acids, benzoic acid, p-tert-butylbenzoic acid, ethylbenzoic acid, isopropylbenzoic acid, toluic acid, xylic acid,
Salicylic acid, 5-tert-octylsalicylic acid, naphthenic acid, cyclohexanecarboxylic acid, adipic acid, maleic acid, acrylic acid, methacrylic acid, and the like.Examples of the phenols include phenol, cresol, ethylphenol, and cyclohexyl. Phenol,
Nonylphenol, dodecylphenol and the like,
Examples of the organic phosphoric acid include mono- or dioctyl phosphoric acid, mono- or didodecyl phosphoric acid, mono- or di-octadecyl phosphoric acid, mono- or di (nonylphenyl) phosphoric acid, nonylphenyl phosphonate, stearyl phosphonate, and the like. .

The amount of the metal salt to be added is preferably 0.05 to 10 parts by weight based on 100 parts by weight of the vinyl chloride resin.

The composition of the present invention may further contain various additives usually used as additives for vinyl chloride resins, for example, polyols, organic phosphite compounds,
Epoxy compounds, β-diketone compounds, phenolic or sulfuric antioxidants, ultraviolet absorbers, hindered amine light stabilizers, plasticizers, inorganic stabilizers, fillers and the like can also be blended.

The polyols include, for example, trimethylolpropane, ditrimethylolpropane, pentaerythritol, dipentaerythritol, polypentaerythritol, pentaerythritol or dipentaerythritol half-ester stearate, bis (dipentaerythritol) adipate, Glycerin,
Tris (2-hydroxyethyl) isocyanurate, sorbitol, mannitol, trehalose and the like can be mentioned.

Examples of the organic phosphite compound include triphenyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite, Tris (mono- and di-mixed nonylphenyl) phosphite, bis (2-tert-butyl-4,6-dimethylphenyl) .ethyl phosphite, diphenyl acid phosphite, 2,2'-methylenebis (4,6-di Tributylphenyl) octyl phosphite, diphenyldecyl phosphite, phenyldiisodecyl phosphite, tributyl phosphite, tris (2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite, dibutyl acid phosphite,
Dilauryl acid phosphite, trilauryl trithiophosphite, bis (neopentyl glycol)
1,4-cyclohexanedimethyldiphosphite, bis (2,4-ditertbutylphenyl) pentaerythritol diphosphite, bis (2,6-ditertbutyl-4-)
Methylphenyl) pentaerythritol diphosphite, distearylpentaerythritol diphosphite, phenyl-4,4'-isopropylidenediphenol pentaerythritol diphosphite, tetra (C
12-15 mixed alkyl) -4,4'-isopropylidenediphenyl phosphite, bis [2,2'-methylenebis (4,6-diamylphenyl)] isopropylidene diphenyl phosphite, hydrogenated-4,4 ' -Isopropylidene diphenol polyphosphite, bis (octylphenyl) bis [4,4'-n-butylidenebis (
2-tert-butyl-5-methylphenol)] • 1,6-hexanediol • diphosphite, tetratridecyl •
4,4'-butylidenebis (2-tert-butyl-5-methylphenol) diphosphite, hexa (tridecyl)
-1,1,3-tris (2-methyl-5-tert-butyl-
4-hydroxyphenyl) butane triphosphonite,
Examples thereof include 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2-butyl-2-ethylpropanediol, 2,4,6-tritert-butylphenol monophosphite, and the like.

Examples of the epoxy compound include epoxidized animal and vegetable oils such as epoxidized soybean oil, epoxidized linseed oil, epoxidized tung oil, epoxidized fish oil, epoxidized tallow oil, epoxidized castor oil, epoxidized safflower oil, and the like. Epoxidized methyl stearate, -butyl, -2-
Ethylhexyl, -stearyl ester, epoxidized polybutadiene, tris (epoxypropyl) isocyanurate, epoxidized tall oil fatty acid ester, epoxidized linseed oil fatty acid ester, bisphenol A glycidyl ether, vinylcyclohexene diepoxide, dicyclohexene carboxylate, 3 , 4-epoxycyclohexenemethylepoxycyclohexanecarboxylate, bisphenol A diglycidyl ether and the like.

Examples of the β-diketone compound include dibenzoylmethane, benzoylacetone, stearoylbenzoylmethane, caproylbenzoylmethane, dehydroacetic acid, tribenzoylmethane, 1,3-bis (benzoylacetyl) benzene and the like, or a mixture thereof. Metal salts (lithium, sodium, potassium, calcium,
Magnesium, barium, zinc, etc.).

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-dodecyl mercaptopropionate). And β-alkyl mercaptopropionates of polyols.

Examples of the ultraviolet absorber include, for example, 2,
4-dihydroxybenzophenone, 2-hydroxy-4
-Methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-tert-butyl-4 '-(2-methacryloyloxyethoxyethoxy) benzophenone, 5,5'-methylenebis (2-hydroxy-4 2-hydroxybenzophenones such as -methoxybenzophenone); 2- (2-hydroxy-5-
Methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-3,5-ditert-butylphenyl) -5-chlorobenzotriazole, 2- ( 2-hydroxy-3-tert-butyl-5-methylphenyl) -5
-Chlorobenzotriazole, 2- (2-hydroxy-
3-dodecyl-5-methylphenyl) benzotriazole, 2- (2-hydroxy-3-tert-butyl-5-C7
~ 9 mixed alkoxycarbonylethylphenyl) triazole, 2- (2-hydroxy-3,5-dicumylphenyl) benzotriazole, 2,2'-methylenebis (4-tert-octyl-6-benzotriazolylphenol), 2- (2-hydroxyphenyl) benzotriazoles such as polyethylene glycol ester of 2- (2-hydroxy-3-tert-butyl-5-carboxyphenyl) benzotriazole; 2- (2-hydroxy-4
-Hexyloxyphenyl) -4,6-diphenyl-1,
3,5-triazine, 2- (2-hydroxy-4-methoxyphenyl) -4,6-diphenyl-1,3,5-triazine, 2- (2-hydroxy-4-octoxyphenyl) -4,6 -Bis (2,4-dimethylphenyl)-
1,3,5-triazine, 2- (2-hydroxy-4-
2- (2-hydroxyphenyl) -1,3,5- such as acryloyloxyethoxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine
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
Benzoates such as di-tert-butyl-4-hydroxybenzoate; substituted oxanilides such as 2-ethyl-2'-ethoxyoxanilide and 2-ethoxy-4'-dodecyloxanilide; ethyl-α-cyano- and cyanoacrylates such as β, β-diphenylacrylate and methyl-2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate.

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-ditert-butyl-4-hydroxybenzyl) malonate and the like.

Examples of the hindered amine stabilizer include, in addition to the above examples, 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-tert-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- (1,2,2,6,6-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,
2,6,6-pentamethyl-4-piperidyl) amino-
s-Triazin-6-ylamino] undecane, 3,9
-Bis [1,1-dimethyl-2- {tris (2,2,
6,6-tetramethyl-4-piperidyloxycarbonyloxy) butylcarbonyloxydiethyl] -2,
4,8,10-tetraoxaspiro [5.5] undecane, 3,9-bis [1,1-dimethyl-2-ditris (1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl) Oxy) butylcarbonyloxydiethyl] -2,4,8,10-tetraoxaspiro [5.
5] Undecane and the like.

Examples of the plasticizer include dibutyl phthalate, butylhexyl phthalate, diheptyl phthalate, dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, dilauryl phthalate,
Phthalic acid-based plasticizers such as dicyclohexyl phthalate and dioctyl terephthalate; adipic acid-based plasticizers such as dioctyl adipate, diisononyl adipate, diisodecyl adipate, and di (butyldiglycol) adipate; ethylene glycol, diethylene glycol, and triethylene glycol as polyhydric alcohols , 1,2-
Propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-hexanediol, 1,6-hexanediol, neopentyl glycol and the like, and as a dibasic acid,
Use oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, etc., and if necessary, monohydric alcohol and monocarboxylic acid. Polyester plasticizer used for the stopper: triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, tri (isopropylphenyl) phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tri (butoxyethyl) phosphate, octyl diphenyl phosphate And other phosphate ester plasticizers; other, tetrahydrophthalic acid plasticizers, azelaic acid plasticizers, sebacic acid plasticizers, stearic acid plasticizers, citric acid plasticizers, and trimellitic acid plasticizers. , Pyromellitic acid plasticizers include biphenylene polycarboxylic acid plasticizers.

Examples of the inorganic stabilizer include calcium oxide, calcium hydroxide, amorphous aluminosilicate, alkali and / or alkaline earth aluminosilicate having a zeolite crystal structure, powdered silica (silica), Examples include sodium perchlorate, magnesium perchlorate, barium perchlorate, and the like.

Examples of the filler include calcium carbonate, silica, clay, glass beads, mica, sericite, glass flake, asbestos, wollastonite, potassium titanate, PMF, gypsum fiber, zonolite,
MOS, phosphate fiber, glass fiber, carbonate fiber, aramid fiber, and the like.

In addition, the composition of the present invention may contain, if necessary, additives usually used for vinyl chloride resins, for example,
Cross-linking agent, antistatic agent, anti-fog agent, plate-out inhibitor,
Surface treatment agents, lubricants, flame retardants, fluorescent agents, fungicides, fungicides,
Metal deactivators, release agents, pigments, processing aids, antioxidants, light stabilizers, foaming agents, and the like can be added.

[0034]

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.

Example 1 The following formulation was heated at 170.degree.
After kneading on a roll at 0 rpm for 7 minutes,
The sheet was pressed for 1 minute to produce a sheet having a thickness of 1 mm. A test piece was prepared from this sheet, and after being immersed in a hot water bath at 70 ° C. for 72 hours, a blow-out (bloom) was observed, and visually evaluated in five steps. Further, at the time of extrusion, the degree of clogging of the wire mesh filter was visually evaluated in five stages. The results are shown in Table 1 below. The names of the sample compounds and the amounts added are as described in Table 1.

(Blending) parts by weight Polyvinyl chloride resin (degree of polymerization 1050) 100 diisononyl phthalate 50 calcium carbonate 25 clay # 33 5 zinc stearate 0.7 dibenzoylmethane 0.15 sorbitol 0.02 stearyl (3,5- Di-tert-butyl-4-0.2hydroxyphenyl) propionate alkamizer 1 (HT) 2.0 Sample compound (see Table 1 below) Variable (Table 1)

<Bloom evaluation stage> 1: No bloom is confirmed. 5: Bloom spreads over the entire surface. Indicates that the degree of bloom is large in accordance with 1 to 5.

<Clogging evaluation method> 1: No clogging occurred for 7 days or more in continuous extrusion. 2: Clogging occurred in 5 to 7 days of continuous extrusion. 3: Continuous extrusion was clogged in 3 days or more and less than 5 days. 4: Clogging occurred in 1 to 3 days of continuous extrusion. 5: Clogging occurred in less than one day of continuous extrusion.

[0039]

[Table 1]

Example 2 The following formulation was kneaded under the same conditions as in Example 1 and pressed at 180 ° C. for 5 minutes to form a 1 mm thick sheet, and the yellowness of the sheet was measured. did. In addition, a test piece was prepared from the above sheet,
Was heated in a gear oven to blacken it, and the thermal stability was evaluated. Further, the degree of clogging of the bloom and the wire mesh filter was evaluated in the same manner as in Example 1. The results are shown in Table 2 below. The names of the hydrotalcite compounds and the amounts added are as described in Table 2.

(Blending) Parts by weight Polyvinyl chloride resin (degree of polymerization 1050) 100 Trioctyl trimellitate 50 Calcium carbonate 25 Zinc stearate 0.7 Dibenzoylmethane 0.15 Sorbitol 0.02 Stearyl (3,5-di Tertiary butyl-4-0.2 hydroxyphenyl) propionate hydrotalcite compound (see Table 2) Variable (Table 2) Magnesium hydroxide 1.0

[0042]

[Table 2]

The following is clear from the results of Tables 1 and 2 above. When only the hydrotalcite compound of the component (a) according to the present invention is added to the vinyl chloride resin and the magnesium hydroxide of the component (b) according to the present invention is not added (Comparative Example 1-1). Has little problem with clogging of the filter,
Not enough. Further, when calcium hydroxide or calcium oxide is added instead of magnesium hydroxide as the component (b) (Comparative Example 1-2, Comparative Example 1-3, Comparative Example 1-4), filter clogging and bloom There is a problem.
Further, even when magnesium hydroxide as the component (b) is added, the addition amount is 5 parts by weight (Comparative Example 1-5).
Then, bloom is suppressed to some extent, but there is a problem that clogging is likely to occur. When only the component (b) is added without adding the hydrotalcite compound as the component (a) (Comparative Example 2-1), filter clogging and bloom can be suppressed to some extent. It is difficult to use in electric wire applications due to problems in coloration, heat stability, and the like.

On the other hand, when the hydrotalcite compound of the component (a) and the component (b) are added in appropriate amounts (all examples), not only the clogging of the filter during processing is suppressed, but also It was also confirmed that bloom also had an excellent suppression effect.

[0045]

Industrial Applicability The vinyl chloride resin composition of the present invention has low toxicity, does not easily cause clogging of a filter during processing, and has an excellent bloom suppressing effect, and can be suitably used as a wire covering material.

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Osamu Yoshiguchi 5-2-13-Shirahata, Urawa-shi, Saitama Asahi Denka Kogyo Co., Ltd. F-term (reference) 4J002 BB241 BD041 BD051 BD061 BD071 BD081 BD091 BD101 BD181 BN201 BP031 DE077 DE286 FB086 FB236 FB246 FB266 FD010 FD020 FD030 FD036 FD037 FD040 FD050 FD070 GQ01 5G305 AA02 AA14 AB24 AB35 AB36 AB40 BA15 BA24 CA03 CC03 CC11 CD09

Claims (1)

[Claims] 1. 100 parts by weight of a vinyl chloride resin,
(A) 0.05 to 10 parts by weight of a hydrotalcite compound represented by the following general formula (1) and (b) 0.001 to 2 parts by weight of magnesium hydroxide, which is a vinyl chloride resin for covering electric wires. Composition. Mg _X1 Zn _X2 Al ₂ (OH) _{2X1 + 2X2 + 4} CO ₃ .mH ₂ O (1) (where X1 and X2 each represent a number satisfying a condition represented by the following formula, and m is 0 or Indicates any positive number: 0 ≦ X
2 / X1 <10, 2 ≦ X1 + X2 <20)