JPH0611816B2 - Flame-retardant resin composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flame-retardant resin composition.

2. Description of the Related Art Conventional Techniques and Problems Thereof Conventionally known flame-retardant resin compositions are halogen-containing polymers or non-halogen-based polymers to which an organic halogen-based flame retardant is added. However, products obtained by using such a flame-retardant resin composition all self-extinguish when they are moved away from the flame, but when they are in a high-temperature flame such as a fire, they burn to the end. There are drawbacks such as continued discontinuity, generation of a large amount of smoke, and thermal decomposition to generate corrosive and highly toxic acid gas, resulting in a secondary disaster.

On the other hand, attempts have been made to solve the above-mentioned drawbacks by blending a low-density ethylene homopolymer, a medium-density ethylene homopolymer or a high-density ethylene homopolymer with a halogen-free flame retardant. However, in order to increase the flame retardancy of a resin composition containing a halogen-free flame retardant to a practically sufficient degree, it is necessary to add a large amount of a halogen-free flame retardant, and therefore the following drawbacks Is inevitable. That is, when a large amount of a halogen-free flame retardant is added to a low-density ethylene homopolymer or a medium-density ethylene homopolymer, the resulting molded article of the resin composition has mechanical properties, especially mechanical strength and elongation. Remarkably lower, causing practical inconvenience. Further, even when a large amount of halogen-free flame retardant is added to the high-density ethylen homopolymer, the molded product of the obtained resin composition is impaired in its mechanical properties, especially mechanical strength and elongation, and With the passage of time, the mechanical properties described above are significantly deteriorated, and it becomes impossible to maintain the practically sufficient mechanical properties. Thus, in the case of a halogen-free resin composition, a flame-retardant resin composition having excellent flame retardancy and capable of imparting to the molded product practically sufficient mechanical properties for a long period of time is still completely Is currently undeveloped.

Means for Solving the Problems An object of the present invention is to provide a halogen-free resin composition having excellent flame retardancy.

Another object of the present invention is to provide a flame-retardant resin composition capable of imparting practically sufficient mechanical properties to the molded product over a long period of time.

Other features of the invention will be apparent from the description below.

The flame-retardant resin composition of the present invention has a density (A) (a) of 0.91 measured by ASTM D1505.
Linear polyethylene having a melt index of 1 to 0.925 and a melt index of 0.1 to 10 measured by ASTM D1238, and (b) a density of 0.86 to 0.89 measured by ASTM D1505 and ASTM D1238
Poly-α having a melt index of 1 to 5 measured by
-Olefin is 1 to 99:99 in weight ratio of the former to the latter.
100 parts by weight of a base polymer mixed in a ratio of 1 to 100 parts by weight, (B) 50 to 300 parts by weight of hydrated magnesia, (C) 0.5 to 40 parts by weight of carbon black, and (D) a titanate coupling agent. It is composed of 5 parts by weight.

In the present invention, the linear polyethylene used as the component (A) is a copolymer of ethylene with an olefin having 4 to 16 carbon atoms and has a density of 0.911 to 0.925 measured by ASTM D1505. And ASTM D123
Melt index (MFR) measured in 8 is 0.1
10 refers to essentially linear polyethylene. Such linear polyethylene is produced, for example, by the method shown below.

That is, it is produced by polymerizing a mixture of ethylene and olefin having 4 to 16 carbon atoms under low pressure in the presence of a catalyst. As the mixing ratio of ethylene and olefin,
About 3 to about 20 parts by weight of the latter per 100 parts by weight of the former,
It is preferably about 5 to about 10 parts by weight. Examples of the catalyst used include so-called Phillips catalysts represented by silica, alumina, zirconia, and chromium oxide with silica-alumina as a carrier, and Group IV to Group IV of the periodic table of elements.
Examples thereof include a Ziegler catalyst produced by a combination of a Group VIII transition metal compound and a Group I to Group IV organometallic compound. As a specific example of the Ziegler catalyst, a combination of TiCl ₄ and alkylaluminum (for example, Al ₂ (Et ₃ ) Cl ₃ , Al (Et) ₂ Cl, AlEt ₃ etc.) can be exemplified. Furthermore, a three-way mixture of such organomagnesium compounds of _{n-Bu 2 Mg · 1 /} 6AlEt 3 and said Ti compound and an organic metal halide may be used as a catalyst. The amount of such a catalyst used is ethylene and carbon number 4
Usually about 0.01 to about 50 parts by weight, preferably about 0.05 to about 2 parts by weight, per 100 parts by weight of the mixture with 16 to 16 olefins.
It is preferably 0 parts by weight. The pressure during this polymerization is
It is usually about normal pressure to about 20 atm, preferably about normal pressure to about 10 atm. Preferable specific production methods for these linear polyethylenes are JP-A-51-112891, JP-A-55-45722 and JP-A-55-1.
The methods described in Japanese Patent No. 13542, US Pat. No. 3,957,448 and the like can be exemplified.

In the present invention, among the above linear polyethylene,
Olefin having a carbon number of about 4 to 10 as a comonomer copolymerized with an ethylene chain constituting the polyethylene is preferable, and more specifically, the comonomers are butene-1, octene-1 and 4-methylpentene-. 1 is most preferred. Specific examples of such linear polyethylene include Mitsubishi Polyethylene-LL H20E, F30F, F
30H [all manufactured by Mitsubishi Petrochemical Co., Ltd.], Ultzex 20
20L, 3010F, 3021F [all manufactured by Mitsui Petrochemicals], DFDA-7540 [made by Union Carbide], NUCG-5651, GS-650, GRSN-
7047, GRSN-7042 [all manufactured by Nippon Unicar Co., Ltd.], Idemitsu Polyethylene-L 0134H, 0234
H (all manufactured by Idemitsu Petrochemical Co., Ltd.) and the like can be exemplified.

Further, in the present invention, the above linear polyethylene is poly-α-
It is essential to use a mixture of olefins. Here, the poly-α-olefin is a copolymer of ethylene polymerized with a Ziegler catalyst and an α-olefin having 4 to 8 carbon atoms, and has a density of 0.86 to 0.89 and MF.
R is 1 to 5. Specific examples of such poly-α-olefin include, for example, Tuffmer A-4090,
A-4085, P-0180, P-0480 [all are the Mitsui Petrochemical company make] etc. can be illustrated.

In the present invention, the mixing ratio of the linear polyethylene and the poly-α-olefin is usually 1 to 2 by weight ratio of the former: the latter.
The ratio is preferably 99: 99-1 and more preferably 40-95: 60-5.

Furthermore, in the present invention, the above linear polyethylene and poly-α are used.
It is also possible to use a mixture of polypropylene, ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer with olefin.

The component (B) used in the present invention is hydrated magnesia,
Specifically, it is MgO.nH ₂ O (n is a number of 0.5 to 5, especially 1.5 to 2.5). The particle size of such hydrated alumina is usually about 10 μm or less, particularly about 5 μm or less, and practically about 0.1 to about 5 μm. As the hydrated magnesia, those having a specific surface area of 3 to 15 m ² / g by the BET method and having a particle size distribution of 5 μm or more by the Luzex's method of 0% are particularly preferable. Specific examples are Kisuma 5B and Kisuma 5
A, Kisuma 5E [Kyowa Chemical Industry Co., Ltd.], KX-
4S (manufactured by Asahi Glass Co., Ltd.) and the like can be exemplified.

In the present invention, the component (B) is usually about 50 to about 300 parts by weight, preferably about 70 parts by weight, relative to 100 parts by weight of the component (A).
To about 200 parts by weight, more preferably about 90 to about 150 parts by weight. If the blending amount of the component (B) exceeds 300 parts by weight, the mechanical properties of the obtained resin composition will be deteriorated. On the contrary, if the amount of the component (B) is less than 50 parts by weight, the flame retardancy of the obtained resin composition will be deteriorated.

In the present invention, red phosphorus, zinc borate as a flame retardant aid,
It is preferable to incorporate titanium dioxide or the like into the composition of the present invention. Here, as the red phosphorus, those commercially available in the past can be widely used. For example, the red phosphorus content is about 80% or more, the loss on drying is about 0.8% or less, and the 74 mesh sieve residue is about 7%. The following are preferable. Further, it is preferable that the surface of the red phosphorus is coated with a thermosetting resin such as a phenol-formalin resin. Specific examples thereof include Novaret # 120 and Novaret # 120UF (both manufactured by Rin Kagaku Kogyo Co., Ltd.).

As the zinc borate, those which are commercially available can be widely used. For example, the chemical formula 2ZnO.3B ₂ O ₃ .3.5H ₂ can be used.
Those represented by O having a particle size of about 2 to about 10 μ and a crystal density of about 2.6 to about 2.8 g / cm ³ are preferable.
Specific examples thereof include zinc borate 2335 [Bora, England]
x company] and the like.

As the titanium dioxide, those commercially available in the past can be widely used, for example, titanium dioxide containing at least about 90% or more of TiO _{2 and} having a particle size of 100 mesh sieves,
Preferable examples include those containing at least about 90% or more TiO _{2 and} having a 149μ sieve residue of 0% and a water content of about 0.7% or less. More specifically, Tietone A-15
0, Tytone R-650 [all manufactured by Sakai Chemical Industry]
Etc.

In the present invention, these flame retardant aids are usually blended in an amount of about 0.5 to about 50 parts by weight, preferably about 2 to about 25 parts by weight, per 100 parts by weight of the component (A). 50% flame retardant aid
If it exceeds the weight part, the mechanical properties of the obtained resin composition tend to be deteriorated, which is not preferable. On the contrary, if the amount of the flame retardant aid is less than 0.5 parts by weight, the effect of adding the flame retardant aid tends to be unrecognized, which is not preferable.

In the present invention, it is preferable to add an antiaging agent to the composition of the present invention. Examples of the antiaging agent include hindered phenol antiaging agents, amine antiaging agents and the like. As the hindered phenol type anti-aging agent, conventionally known ones can be widely used, and examples thereof include tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenol) propionate [methane [Irganox 1010, Ciba Geigy. Company], 2,
2-thio [diethyl-bis-3- (3,5-di-tert-
Butyl-4-hydroxyphenol) propionate]
[Irganox 1035, manufactured by Ciba Geigy], 4,
4'-thiobis (3-methyl-6-tert-butylphenol) [Santonox, manufactured by Monsanto], 4,4 '
-Methylene-bis (3,5-di-tert-butylphenol) [Ionox 220, manufactured by British ICI] and the like can be mentioned. As the amine anti-aging agent, conventionally known ones can be widely used, and specific examples thereof include, for example, antioxidant DDA [DDA, manufactured by Bayer Co.],
N, N'-di-β-naphthyl-p-phenylenediamine [Nocrac White, manufactured by Ouchi Shinko Co., Ltd.], N, N'-diphenyl-p-phenylenediamine [Nocrac DP,
Ouchi Shinko Co., Ltd.] N, N'-diisopropyl-p-phenylenediamine [Antioxidant No. 23, manufactured by Deupon Co., Ltd., and the like. In the present invention, these antioxidants can be used alone or in combination of two or more.

The amount of the antioxidant to be added is usually about 0.1 to about 5 parts by weight, preferably about 0.2 to about 3 parts by weight, and more preferably about 0.3 to about 100 parts by weight of the component (A). It is recommended to use about 2 parts by weight. Even if the amount of the antioxidant is more than 5 parts by weight, the antiaging effect is not so improved, which is economically unfavorable. On the other hand, if the amount of the antiaging agent is less than 0.1 part by weight, the antiaging effect is difficult to be exhibited, which is not preferable.

The composition of the present invention preferably contains a higher fatty acid or a metal salt thereof as a processing aid. Examples of higher fatty acids include stearic acid and oleic acid, and examples of metal salts include zinc salts and calcium salts.

The amount of the higher fatty acid or metal salt thereof to be added is usually about 0.1 to about 10 parts by weight, preferably about 0.5 to about 5 parts by weight, per 100 parts by weight of the component (A).
If the blending amount of the higher fatty acid or its metal salt exceeds 10 parts by weight, there is a tendency that the resin composition obtained has a drawback that properties such as mechanical properties are deteriorated. If the blending amount is less than 0.1 part by weight, the effect of addition as a processing aid cannot be recognized.

Further, it is necessary to add carbon black to the composition of the present invention. By adding carbon black, the flame retardancy of the resin composition can be further improved. The carbon black, for example fir Ness loiter for DBP oil absorption ASTM code to a 100~160cm ³ / 100g is recognized as N330～N351, DBP oil absorption amount can be exemplified thermal black and the like of 30 to 50 cm ^3/100 g . Specific examples of such carbon black include FEF carbon black and H
AF carbon black, ISAF carbon black, S
RF carbon black and the like can be exemplified, and more specifically, for example, diamond black H, diamond black HS (all manufactured by Mitsubishi Kasei), Vulkan-3, Vulkan-3.
H [all manufactured by KYABOT CORPORATION], SEAST H, SEAST 3H [all manufactured by Tokai Electrode], KETSU EMBRACK H
AF (manufactured by Ketsutsuen Co., Ltd.) and the like can be mentioned. Among these, diamond black H and Vulkan-3 are preferable.

In the present invention, the above carbon black is usually used as the component (A) 1
About 0.5 to about 40 parts by weight, preferably about 1 to about 20 parts by weight, per 100 parts by weight. If the blending amount of carbon black exceeds 40 parts by weight, mechanical properties of the obtained resin composition tend to be impaired, which is not preferable. If the amount of carbon black is less than 0.5 part by weight, the ashing characteristics are difficult to be exhibited, which is not preferable.

In the present invention, it is necessary to incorporate a titanate coupling agent into the composition of the present invention. As the titinate coupling agent, conventionally known ones can be widely used,
For example, monoalkoxy type, neoalkoxy type, coordination type,
A chelate type etc. can be illustrated. Among the above titanate coupling agents, those containing phosphorus are preferred. Specific examples thereof include tetraisopropyl di (dioctyl sulfite) titanate [KR-41B, manufactured by Kenritsu Co., Ltd.], isopropyl tris (dioctyl pyrophosphate) titanate [KR38S, manufactured by the same company], bis (dioctyl pyrophosphate) oxy. Acetate titanate [KR138S, manufactured by the same company] and the like can be exemplified.

Specific examples of the chelate type titanate coupling agent include diisostearoyloxyacetate, titanate [KR-101, manufactured by Kenritsu Co., Ltd.], dicumylphenolate oxyacetate titanate [KR-134S, manufactured by the same company], di (dioctyl). Phosphate) ethylene titanate [KR-212, manufactured by the same company], 4-aminobenzenesulfonyl dodecylbenzenesulfonyl ethylene titanate [KR-226S, manufactured by the same company], di (butyl, methylpyrophosphate) ethylene titanate [KR-2
62ES, manufactured by the same company] and the like.

In the present invention, the silane coupling agent can be used in combination with the titanate coupling agent. Here, the silane coupling agent is preferably a trialkoxysilane having a carbon-carbon double bond or an epoxy group, and specifically, vinyl-tris (β-methoxyethoxysilane).
[A172, manufactured by Nippon Unicar], γ-methacryloxypropyltrimethoxysilane [A174, manufactured by the same company],
Examples include β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane [A186, manufactured by the same company], γ-glycidyloxypropyltrimethoxysilane [SH6040, manufactured by Toray Silicone Company].

The amount of the coupling agent to be added is usually (A) above.
The amount may be about 0.1 to about 5 parts by weight, preferably about 0.3 to about 3 parts by weight, and more preferably about 0.5 to about 2 parts by weight, per 100 parts by weight of the component. The amount of coupling agent is 5
If it exceeds the amount by weight, the flame retardancy, heat resistance and the like of the obtained resin composition tend to decrease, which is not preferable. If the amount of coupling agent is less than 0.1 parts by weight,
The workability tends to be poor.

In the present invention, when the polypropylene is used as the component (A) in a mixture with linear polyethylene, it is particularly preferable to add a copper damage inhibitor to the composition of the present invention. As the copper damage inhibitor to be used, conventionally known ones can be widely used. For example, N, N'-bis [3- (3 ',
5'-di-tert-butyl-4'-hydroxyphenyl)
Examples include propionyl] ′ hydrazine, [3- (N-salicyloyl) amino-1,2,4 terorazole], N, N′-dibesaloxalyl dihydrazide, N, N′-disalicylidene oxalyl hydrazide. The compounding amount of the copper damage inhibitor is usually about 0.02 to about 5 parts by weight, preferably about 0.1 parts by weight per 100 parts by weight of the polypropylene.
~ About 2 parts by weight is recommended. The compounding amount of copper damage inhibitor is 5
Even if it exceeds the amount by weight, the effect of adding the copper damage inhibitor is not so improved, which is economically unfavorable. Further, if the content of the copper damage inhibitor is less than 0.02 part by weight, the copper damage preventing effect is difficult to be exhibited.

In addition to the above-mentioned various components, various fillers, small amounts of organic flame retardants, plasticizers, pigments and the like can be added to the composition of the present invention.

Examples of the filler include zinc oxide, magnesium oxide,
Metal oxides such as beryllium oxide, boron oxide and aluminum oxide, carbonates such as magnesium carbonate and calcium carbonate, silicates such as clay, talc and feldspar powder, graphite, graphite, barium sulfate, lithopone, silicas, diatomaceous Examples thereof include soil, mica powder, silica sand, slate powder, asbestos, aluminum sulfate, calcium sulfate, molybdenum disulfide and potassium titanate. The blending amount of such filler is
Usually, the amount is about 5 to about 200 parts by weight, preferably about 10 to about 150 parts by weight, and more preferably about 5 to about 50 parts by weight per 100 parts by weight of the component (A). When the blending amount of the filler exceeds 200 parts by weight, the mechanical properties of the obtained resin composition tend to deteriorate, which is not preferable. Further, if the amount of the filler to be blended is less than 5 parts by weight, the effect of adding the filler cannot be recognized, which is also not preferable.

Examples of the organic flame retardant include tris (2,3-dibromopropyl) isocyanurate, 2,3-dibromopropyl methacrylate, pentabromotoluene, decabromodiphenyl ether, tetrabromobisphenol S,
Organic bromine compounds such as 2,2'-bis (4-hydroxy-3,5-dibromophenyl) propane, bis (2,3-
Dibromopropyl) organobromine phosphorus compounds such as dichloropropyl phosphate, chlorinated paraffins, dimethylchlorendate, organic chlorine compounds such as dechlorane plus 25 [manufactured by Fukka Co., USA], phenylphosphonic acid, di (polyoxyethylene) Examples thereof include organic phosphorus compounds such as hydroxymethylphosphonate. The amount of the flame retardant compounded is usually about 0.5 to about 10 parts by weight, preferably about 1 to about 5 parts by weight, per 100 parts by weight of the component (A). If the compounding amount of the organic flame retardant exceeds 10 parts by weight, the smoke amount of the obtained resin composition at the time of combustion tends to be large and the amount of toxic hydrogen halide tends to be increased, which tends to be a problem. If the amount of the organic flame retardant is less than 0.5 parts by weight, the effect of adding the organic flame retardant cannot be recognized, which is not preferable.

Examples of the plasticizer include naphthene-based, aroma-based, process oil, phthalic acid esters, trimellitic acid esters, epoxy resins and the like. The compounding amount thereof is usually about 100 parts by weight of the above-mentioned component (A). The amount may be 0.2 to about 50 parts by weight, preferably about 1 to about 10 parts by weight.

Examples of the pigment include phthalocyanine blue, chrome yellow, red iron oxide, and the like. The amount of the pigment is usually about 0.1 to about 20 parts by weight, preferably about 0.5 to about 100 parts by weight of the component (A). About 10 parts by weight is recommended.

The resin composition of the present invention can be used after being crosslinked. As the crosslinking method in such a case, for example, any of a method using an organic peroxide, a crosslinking method by an electron beam, a crosslinking method by radiation and a method by water crosslinking may be adopted. The method for crosslinking the resin composition of the present invention is particularly
It is preferable that the above method is used.

The composition of the present invention can be obtained by appropriately mixing the predetermined amounts of the above-mentioned various components and uniformly mixing them by a conventionally known method using a Banbury mixer, a Henschel mixer or the like. All of the above components can be mixed at the same time, but the coupling agent is preferably added at the same time when the filler is added. When two or more polymers are used as the component (A), it is preferable that the polymers are first mixed uniformly and then the other components are mixed.

In using the composition of the present invention, various conventionally known molding methods can be widely adopted. For example, the composition of the present invention is kneaded using a kneader such as a roll or a kneader, and then this is used for applications. It may be formed into various shapes depending on the situation.

EFFECTS OF THE INVENTION Since the composition of the present invention is essentially halogen-free, it does not generate a large amount of smoke even when it is left in a flame at high temperature such as in the case of fire, and it does not undergo thermal decomposition. It is less likely to generate corrosive gas or acid gas, and has excellent flame retardancy, mechanical strength, electrical characteristics, aging resistance and the like. Therefore, the composition of the present invention is a building material,
It is suitable as a coating material for pipes, hoses, sheets, seat covers, wall materials, electric cables (inner insulators, outer sheaths, etc.).

In particular, the composition of the present invention can be suitably used as a flame-retardant resin composition for insulating coating or sheath coating of electric cables. In such a case, the composition of the present invention is used as an electrical insulating layer on a conductor of various communication cables, power cables, control cables and the like, on an appropriate portion such as on an inner semiconductive layer, and on the insulating layer of these cables. Can be used as a protective layer (sheath) on an appropriate portion such as on the outer semiconductive layer, and in any of these cases, the wire cable can be imparted with high flame retardancy and flame resistance.

Examples The present invention will be further clarified with reference to the following examples.

The characteristics of the samples obtained in each of the following examples were tested by the following methods.

<Flame Retardancy Test> The composition of the present invention is uniformly kneaded using a roll mill, and then hot press molded (pressure 100 to 150 Kg / cm ² , temperature 180 ° C., time 10 minutes) to give a sample having a thickness of 3.0 mm. Create a sheet, and use JIS K 72 for this sample sheet.
Oxygen index (LOI) is obtained according to 01 (oxygen index method) to evaluate flame retardancy.

<Mechanical Properties> Kneading and molding are performed in the same manner as described above to prepare a sample sheet having a thickness of 1 mm, and the properties of the sample sheet are examined.

(1) 100% modulus (kg / mm ² ) According to ASTM D882.

(2) Tensile strength (kg / mm ² ) According to ASTM D882.

(3) Elongation (%) According to ASTM D882.

<Electrical properties (room temperature)> The composition of the present invention is uniformly kneaded using a roll mill, and then hot press molded (pressure 100 to 150 kg / cm ² , temperature 180 ° C., time 10 minutes) to give a sample sheet having a thickness of 1 mm. JIS C 2123 was prepared for this sample sheet.
In accordance with, calculate ρ (ohm-cm).

<Aging characteristics> For the same sample sheet used for the above electrical characteristics sample,
The tensile strength residual rate (%) and elongation residual rate (%) after 100 ° C. × 10 days are determined according to ASTM D573.

Further, the symbols of the respective components in the following respective examples show the following.

<Base polymer> A-1 ... Linear polyethylene [Mitsui Petrochemical Co., Ltd., Ultox 2020L, MFR = 2.1, density = 0.9
20] A-2 ... Linear polyethylene [Mitsubishi Petrochemical Co., Ltd., Mitsubishi Polyethylene-LLF30F, MFR = 1.0, density = 0.92]
0] A-3 ... Poly-α-olefin [Mitsui Petrochemical Co., Tuffmer A4090, MFR = 3.6, density = 0.89] A-4 ... Poly-α-olein [Mitsui Petrochemical Co., Tuffmer P0480, MFR = 1.2, density = 0.88] <Difficult-to-use agent> B-1 ... Mg (OH) ₂ [Kyowa Chemical Co., Kisuma 5B] <Carbon black> C-1 ... HAF carbon [Mitsubishi Chemical Company, diamond black H] C-2 ... HAF carbon [Cabot, Vulca
n-3] <Titanate coupling agent> D-1 ... Titanium coupling agent [Kenritch Co., Ltd., KR
38S, isopropyl tris (dioctyl pyrophosphate) titanate] D-2 ... Titanium coupling agent [Kenritch Co., KR
138S, bis (dioctylpyrophosphate) oxyacetate titanate] D-3 ... Chelate type titanium coupling agent [KR101, diisostearoyloxyacetate titanate manufactured by Kenritsu Co., Ltd.] <Additive> E-1 ... Red phosphorus [Phosphorus chemistry] Novalet # 120] E-2 ... Titanium dioxide [Sakai Chemical Industry Co., Ltd., Tytone A
150] E-3 ... Stearic acid E-4 ... Anti-aging agent [Ouchi Shinko Co., Nocrac 30
0,4,4'-dihydroxy-3,3'-di-tert-butyl-5,5'-dimethyl-diphenylsulfide] Example 1 Next to the predetermined amount (parts by weight) of each component shown in Table 1 below. The composition of the present invention was obtained by mixing according to the above method. That is, the base polymer, hydrated magnesia, carbon black, titanate coupling agent, and other additives were mixed with a roll mill in a roll mill.
After uniformly mixing at a temperature of 30 to 180 ° C., a sheet-shaped composition was prepared.

The respective properties of the composition of the present invention obtained above are shown in Table 2 below.

From Table 2 above, it can be seen that the sheet obtained using the composition of the present invention has various properties such as excellent flame retardancy, mechanical properties, electrical properties, and aging properties.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08K 3:04 3:22 5:10) (56) References JP-A-59-179538 (JP, A) Special features Kai 55-31871 (JP, A) JP-A-53-63452 (JP, A)

Claims (1)

[Claims] 1. (A) (a) The density measured by ASTM D1505 is 0.911 to 0.925 and ASTM D1
A linear polyethylene having a melt index of 0.1 to 10 measured by 238 and (b) a density of 0.86 to 0.89 measured by ASTM D1505 and ASTM
The poly-α-olefin having a melt index of 1 to 5 measured by D1238 is the former: the latter is 1 by weight.
Base polymer 1 mixed in a ratio of about 99: 99-1
Flame-retardant resin composition consisting of 100 parts by weight, (B) hydrated magnesia 50 to 300 parts by weight, (C) carbon black 0.5 to 40 parts by weight, and (D) titanate coupling agent 0.1 to 5 parts by weight object.