JP2008007723A - Flame-retardant resin composition, electric wire and cable using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a flame-retardant resin composition that overcomes the defect of a polyolefin-based resin composition mixed with a metal hydroxide, has excellent properties such as tensile strength, easy-to-cut performance, flame retardance, smoothness, scratching and whitening resistance, flexibility, processability, etc., an electric wire and a cable using the same. <P>SOLUTION: The flame-retardant resin composition comprises (A) 100 parts by mass of a thermoplastic resin, (B) 30-250 parts by mass of a metal hydrate having (i) an average particle diameter of 1-10μm obtained on the basis of a volume standard particle diameter distribution measured by a laser light diffraction/scattering type particle diameter distribution measuring instrument, (ii) a length average particle diameter of 0.01-0.5μm on the basis of an individual standard particle diameter distribution in the major axis direction of primary particles measured from a morphologic photograph by a morphological photography by a scanning electron microscope in which secondary particles composed of aggregates formed from primary particles are observed and ≤0.1% of particles having ≥5μm and (iii) a specific surface area by a BET method of ≥8.0m<SP>2</SP>/g and (C) 0.05-20 parts by mass of a scratching and whitening inhibitor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention does not generate toxic gases such as halogen gas during combustion, has excellent flame retardancy and mechanical properties, and has flame retardancy that overcomes the contradictory performance of easy cutability (end cutting treatment) and scratch resistance and whitening resistance. In particular, the present invention relates to a flame retardant resin composition suitably used for an insulating layer or a sheath layer of an electric wire and a cable, and an electric wire and a cable coated with the flame retardant resin composition. .

  Conventionally, a polyvinyl chloride resin composition has been used as a flame retardant material such as a wire covering material. However, since the polyvinyl chloride resin composition generates a toxic halogen-containing gas when combusted, improvement has been demanded. In order to overcome the above disadvantages of the polyvinyl chloride resin, a resin composition (non-halogen flame retardant material) in which a metal hydrate such as magnesium hydroxide is blended with a polyolefin-based resin has been proposed (for example, see Patent Document 1). .

  In such a resin composition, in order to impart flame retardancy to a polyolefin-based resin or the like, metal hydrate is generally the same as the resin component in the composition, depending on the required level of flame retardancy. The amount needs to be added to a high concentration. For this reason, in order to achieve a high flame retardant level, the amount of the matrix resin must be reduced, and as a result, there is a problem that mechanical properties depending on the physical properties of the resin are lowered. In order to overcome such problems, it has been recently studied to maintain both physical properties of flame retardancy and mechanical properties. For example, a resin having high flame retardancy and good mechanical properties, in which 40 to 300 parts by weight of a metal hydrate having a small average particle diameter treated with a silane coupling agent is blended with 100 parts by weight of an olefin polymer. A composition (see, for example, Patent Document 2) has been proposed. However, in this method, mechanical properties including tensile impact strength are good, but in the case of electric wires and cables coated with the resin composition, the core wire to be performed at the time of wiring construction is crimped or soldered to various connectors, etc. However, there remains a problem that it is difficult to peel off and cut off the coating layer or the insulating layer from the core wire with a jig or the like (also referred to as a terminal cutting process).

  Also, a resin composition containing 60 to 200 parts by weight of a metal hydrate having a large specific surface area to which 1 to 25% of a high degree of polymerization polyorganosiloxane is added to 100 parts by weight of a polyolefin resin (for example, Patent Document 3) is proposed. This is because the flame retardancy is improved by using a metal hydrate with a large specific surface area, so flame retardancy and extrudability, appearance of molded products, tensile properties, flexibility, etc. can be reduced by reducing the amount added to the resin. However, this method is expected to have high tensile impact strength due to the mechanical properties being improved by relatively increasing the amount of matrix resin, making it easy to cut during wiring construction. There remains a problem that it is difficult to perform (end cutting).

On the other hand, as a method for solving easy cutability (terminal cutting treatment), a soft material and / or a liquid emulsifier is blended in addition to an ethylene polymer, a functional group-containing olefin polymer and an inorganic flame retardant, so that it is flexible and tensile. A method of obtaining a resin composition having low impact strength and easy cutting properties (see, for example, Patent Document 4), in addition to an ethylene polymer, a functional group-containing olefin polymer, and an inorganic flame retardant, having a specific density A method of obtaining a resin composition having a low tensile impact strength and good cutability by blending a polyethylene resin (for example, see Patent Document 5) has been proposed.
In addition, these resin compositions contain a large amount of inorganic flame retardant in order to achieve high flame retardancy, so mechanical strength, flexibility and workability are reduced, and they are used as electric wires, cables, etc. In such a case, there is a problem that the surface is damaged and whitening occurs during construction or use. Conventionally, in particular, in order to satisfy easy cutting properties, the object is easily achieved by blending a large amount of metal hydrate and sacrificing mechanical strength such as tensile strength. As described above, the means for achieving high flame retardancy and easy cutability and the means for achieving mechanical strength and prevention of scratched whitening are contradictory solutions. In particular, in the case of electric wires and cables, the whitening phenomenon becomes conspicuous because it is used by coloring it in black, red, green or the like.

  Conventionally, as a method for eliminating these whitening phenomena, compositions containing mineral oil, wax, higher fatty acids, and the like have been proposed (see, for example, Patent Document 6), but these proposed compositions are easily cut. It does not satisfy the sex.

  Thus, conventionally, in order to achieve non-halogen-based high flame retardancy, a flame retardant resin composition containing a large amount of an inorganic flame retardant is inferior in cutability as compared with a vinyl chloride resin. In addition, easy cutting properties can be improved by increasing the amount of metal hydroxide, but at the same time, physical properties such as a decrease in tensile strength and damage resistance have been reduced, and a product with a good overall balance has been obtained. Absent. Further, the poor cutability affects the workability when the coating material is peeled off in the field construction of the electric wire and the appearance after the construction. Further, since the whitening resistance with scratches is blended in a large amount with an inorganic flame retardant, the whitening phenomenon becomes remarkably noticeable in the case of electric wires and cables because they are colored with black, red, green or the like. Moreover, flexibility and workability are also lowered.

Japanese Patent Application Laid-Open No. 07-149965 JP 2005-139388 A JP 2005-179409 A JP 2005-029604 A JP 2005-029605 A Japanese Patent Publication No. 07-119324

  The object of the present invention is to overcome the disadvantages of the polyolefin-based resin composition containing the above-mentioned metal hydroxide in view of the above-mentioned problems of the prior art, as well as physical properties such as tensile strength, easy cut performance, flame retardancy. An object of the present invention is to provide a flame retardant resin composition excellent in various physical properties such as property, smoothness, scratch-resistant whitening, flexibility, and workability, and an electric wire and cable using the same.

  As a result of intensive studies to solve the above problems, the present inventors have found that secondary particles having an average particle size in a specific range are further smaller in thermoplastic resins, preferably polyolefin resins and / or thermoplastic elastomers. Resin composition containing a specific amount of metal hydrate and a specific anti-whitening agent, which is formed from an aggregate structure of fine particles of primary particles and has a large specific surface area, is easy to cut as well as physical properties such as tensile strength The present invention has been completed by finding that it can be a flame retardant resin composition having excellent performance, flame retardancy and smoothness and excellent whitening prevention performance.

That is, according to 1st invention of this invention, the flame-retardant resin composition characterized by including the following (A), (B) and (C) is provided.
(A) 100 parts by mass of a thermoplastic resin (B) 30 to 250 parts by mass of a metal hydrate that satisfies the following conditions (a) to (c) (a) Measured with a laser diffraction / scattering particle size distribution meter (B) Secondary particles composed of aggregates formed from primary particles from a morphological photograph taken by a scanning electron microscope. Particles having a length average particle diameter in the range of 0.01 to 0.5 μm and a particle diameter of 5 μm or more based on the number-based particle size distribution in the major axis direction of primary particles measured from morphological photographs. (C) Specific surface area by BET method is 8.0 m ² / g or more (C) Prevention of at least one kind of damaged whitening selected from the following (c1) to (c4) 0.05-20 parts by weight of agent (c1) mineral oil Waxes or paraffins (c2) higher fatty acids or their esters, amides or metal salts (c3) silicones (c4) partial fatty acid esters of polyhydric alcohols, fatty alcohols, fatty acids, aliphatic amines, fatty acid amides, alkylphenols and alkylnaphthols Alkylene oxide adducts of compounds selected from

According to the second invention of the present invention, in the first invention, (B) the metal hydrate is further measured by (d) an average particle diameter measured by a laser light diffraction / scattering particle size distribution measuring device. And a flame retardant resin composition characterized by satisfying the condition that the ratio of the average particle diameter of primary particles measured from a morphological photograph taken with a scanning electron microscope is 5 or more.

  According to the third invention of the present invention, in the first or second invention, the (B) metal hydrate is (B1) magnesium hydroxide and / or (B2) aluminum hydroxide. A flame retardant resin composition is provided.

  According to a fourth aspect of the present invention, there is provided the flame retardant resin composition according to the third aspect, wherein (B1) magnesium hydroxide is produced by a synthesis method. .

  According to a fifth aspect of the present invention, in the fourth aspect, (B1) the magnesium hydroxide obtained by the synthesis method is obtained by adding an alkaline substance to an aqueous solution containing a magnesium salt, or magnesium oxide is water. A flame retardant resin composition characterized by being obtained by adding together is provided.

  According to a sixth invention of the present invention, in any one of the first to fifth inventions, (A) the thermoplastic resin is a resin containing (A1) a polyolefin-based resin and / or (A2) a thermoplastic elastomer. A flame retardant resin composition is provided.

According to a seventh aspect of the present invention, in the sixth aspect, (A) the thermoplastic resin comprises an ethylene / unsaturated carboxylic acid ester copolymer, an ethylene / vinyl ester copolymer, and a density of 0. (A1) 100-20% by mass of a polyolefin resin and (A2) a thermoplastic elastomer which is at least one ethylene copolymer selected from ethylene / α-olefin copolymers of .86 to 0.94 g / cm ³ Provided is a flame retardant resin composition, which is a resin containing 0 to 80% by mass.

  Moreover, according to the eighth invention of the present invention, in any one of the first to seventh inventions, (A) 100 mass parts of the thermoplastic resin and (D) 1-30 mass% of the functional group-containing polyolefin resin. (However, the sum of (A) + (D) is 100% by weight) is provided.

  According to the ninth aspect of the present invention, there is provided an electric wire or cable using the flame-retardant resin composition of any one of the first to eighth aspects.

  In the flame retardant resin composition of the present invention, a specific amount of a metal hydrate having a characteristic that a particle having an average particle diameter in a specific range is formed with an aggregate structure of smaller fine particles and has a large specific surface area is blended. Keeps the performance of the conventional non-halogen flame retardant resin composition, and provides high performance such as high flame retardancy, easy cutability (end cutting treatment), mechanical strength, surface smoothness, scratch resistance and whitening resistance. An excellent resin composition that can provide an electric wire / cable, and the electric wire and cable using the flame retardant resin composition for an insulating layer and / or a sheath layer, etc. are excellent in the above-mentioned performances and have a good product appearance. , Easy cutability at the construction site (end cutting process), good scratch resistance and whitening, and excellent workability.

  The present invention provides a flame retardant resin composition comprising (A) a thermoplastic resin, (B) a metal hydrate, and (C) an anti-scratch whitening agent, and optionally (D) a functional group-containing polyolefin resin, And an electric wire and cable using the flame retardant resin composition. Hereinafter, the present invention will be described in detail for each item.

1. Component of Flame Retardant Resin Composition (A) Thermoplastic Resin (A) The thermoplastic resin used in the flame retardant resin composition of the present invention is not particularly limited, but preferably (A1) polyolefin Resin and / or (A2) thermoplastic elastomer. Each component will be described below.

(A1) Polyolefin-based resin The (A1) polyolefin-based resin used in the present invention is a high-density polyethylene having a density of 0.94 to 0.97 g / cm ³ by ion polymerization, a density of less than 0.91 to 0.94 g / cm ^3. Ethylene / α-olefin copolymer (linear low density polyethylene), ethylene / α-olefin copolymer (ultra low density polyethylene) having a density of 0.86 to less than 0.91 g / cm ³ , high pressure radical polymerization Low density polyethylene, ethylene / α, β-unsaturated carboxylic acid copolymer, ethylene / α, β-unsaturated carboxylic acid ester copolymer, ethylene / vinyl ester copolymer, etc., polyethylene resin, polypropylene resin And at least one polyolefin resin selected from the above.
Among these polyolefin resins, the details will be described below. (A1) Ethylene / α, β-unsaturated carboxylic acid ester copolymer, (a2) Ethylene / vinyl ester copolymer, (a3) Density 0.86 An ethylene / α-olefin copolymer of less than ˜0.94 g / cm ³ is preferred because of its excellent acceptability of the component (B) metal hydrate.
Here, the density is a value measured according to JIS K6922-1 (1997).

(A1) Ethylene / α, β-unsaturated carboxylic acid ester copolymer As a copolymer of ethylene and α, β-unsaturated carboxylic acid ester, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate Copolymer, Ethylene / butyl acrylate copolymer, Ethylene / methyl methacrylate copolymer, Ethylene / (meth) acrylic acid or its alkyl ester copolymer such as ethylene / ethyl methacrylate copolymer; Ethylene / anhydrous Maleic acid / vinyl acetate copolymer, ethylene / maleic anhydride / methyl acrylate copolymer, ethylene / maleic anhydride / ethyl acrylate copolymer binary copolymer or multi-component copolymer, or their A metal salt etc. are mentioned.
In the above copolymer, comonomer copolymerized with ethylene includes methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, acrylic acid -N-butyl, -n-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate and the like can be mentioned. Among these, alkyl esters such as methyl (meth) acrylate and ethyl (meth) acrylate are particularly preferable. In particular, the (meth) acrylic acid ester content is in the range of 3 to 30% by mass, preferably 5 to 20% by mass.
Moreover, K, Na, Li, Ca, Zn, Mg, Al etc. are mentioned as a metal of the said metal salt.

(A2) Ethylene / vinyl ester copolymer As the ethylene / vinyl ester copolymer, ethylene produced by a high-pressure radical polymerization method, vinyl propionate, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate, Examples thereof include copolymers with vinyl ester monomers such as vinyl stearate and vinyl trifluoroacetate. Particularly preferable examples of these vinyl esters include vinyl acetate.
The proportion of ethylene and vinyl ester in the copolymer is 50 to 99.5% by mass of ethylene, 0.5 to 50% by mass of vinyl ester, and 0 to 49.5% by mass of other copolymerizable unsaturated monomers. A copolymer consisting of is preferred. Furthermore, the vinyl ester content is preferably selected in the range of 3 to 20% by mass, particularly preferably 5 to 15% by mass.

(A3) Ethylene / α-olefin copolymer The ethylene / α-olefin copolymer has a density of 0.86 to less than 0.91 g / cm ³ (linear ultra-low density polyethylene) and a density of 0.91. To less than 0.94 g / cm ³ (linear low density polyethylene), preferably in the range 0.88 to 0.91 g / cm ³ ethylene / α-olefin copolymer (linear ultra low density polyethylene) and A mixture thereof may be mentioned. The α-olefin has 3 to 20 carbon atoms, preferably 4 to 12 carbon atoms, and specifically includes propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-hexene, Examples include octene, 1-decene, 1-dodecene and the like.
The polyethylene resin (a3) according to the present invention may be a mixture of two or more kinds of polyethylene resins as long as the above conditions are satisfied.

The ethylene / α-olefin copolymer (a3) is a slurry method, a solution method, a gas phase method by ionic polymerization of a Ziegler catalyst, a Philips catalyst, a vanadium catalyst, a metallocene catalyst, etc. under high, medium and low pressure. It can be produced by a polymerization method such as a bulk method.
The polyethylene resin (a3) produced by the above ion polymerization is not particularly limited to the production catalyst and process, etc., and the book “Polyethylene Technology Reader” (edited by Kazuo Matsuura and Naotaka Mikami, Industry Research Committee 2001) P. 123-160, p. It can be produced by a method described in 163 to 196 or the like.

The melt mass flow rate (MFR) of the (A1) polyolefin resin is preferably from 0.01 to 100 g / 10 minutes, more preferably from 0.1 to 50 g / 10 minutes, still more preferably from 0.1 to 10 g / 10. Selected in the range of minutes.
Here, MFR is a value measured under condition D (temperature 190 ° C., load 21.18 N) in accordance with JIS K6922-1 (1997).

(A2) Thermoplastic elastomer (A2) The thermoplastic elastomer that can be used in the present invention includes various thermoplastic elastomers such as olefin elastomer, styrene elastomer, polyester elastomer, polyamide elastomer, polyurethane elastomer, and natural rubber. Natural or synthetic rubbers such as polyisobutylene, polyisoprene, chloroprene rubber, butyl rubber, and nitrile butyl rubber. Among these, (a4) olefin elastomer and (a5) styrene elastomer, which will be described in detail below, are preferable.

(A4) Olefin Elastomer As the olefin elastomer, ethylene-propylene copolymer (EPR), ethylene-propylene-diene copolymer (EPDM), ethylene / 1-butene copolymer, ethylene / 1-octene copolymer In the presence of a crosslinking agent, amorphous or microcrystalline ethylene / α-olefin copolymer having a density of 0.86 to 0.91 g / cm ³ , polybutene, chlorinated polyethylene, polypropylene and EPDM and, optionally, polyethylene. Examples thereof include a partially crosslinked product or a completely crosslinked product.

(A5) Styrene-based elastomer Examples of the styrene-based elastomer include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-isoprene / butadiene-styrene copolymer (SIBS). Block copolymer, or styrene-ethylene-butene-styrene copolymer (SEBS), styrene-ethylene-propylene-styrene copolymer (SEPS), styrene-butadiene-butylene-styrene copolymer (partially hydrogenated styrene) Examples thereof include a part of a block copolymer such as (butadiene-styrene copolymer) or a completely hydrogenated product.

As the thermoplastic resin (A) of the present invention, polyolefin (A1) and / or thermoplastic elastomer can be preferably used. However, since a large amount of metal hydrate is blended, an acceptable amount thereof is ensured. In order to maintain the balance between flexibility and mechanical strength, it is also one of desirable modes that (A1) a polyolefin resin and (A2) a thermoplastic elastomer are used in combination. In particular, it is preferable to select the resins (a1) to (a3) of the component (A1).
These composition ratios are (A1) polyolefin resin, Preferably it is 100-20 mass%, More preferably, it is 100-60 mass%, Most preferably, it is 100-70 mass%, (A2) thermoplastic elastomer is The content is preferably 0 to 80% by mass, more preferably 0 to 40% by mass, and particularly preferably 0 to 30% by mass.
In the blends of (A1) and (A2), the blending ratio differs depending on the purpose, but when (A1) is less than 20% by mass and (A2) is greater than 80% by mass, the blend is excellent in flexibility. In order to obtain a composition having a good balance of mechanical strength, flexibility, etc., the above range is preferable.

(B) Metal hydrate (B) Metal hydrate used in the flame retardant resin composition of the present invention is (b) a volume-based particle size distribution measured by a laser light diffraction / scattering particle size distribution meter. (B) From the morphological photograph taken by a scanning electron microscope, it is observed that secondary particles composed of aggregates formed from primary particles are included. The length average particle size based on the number-based particle size distribution in the major axis direction of the primary particles measured from the morphological photograph is in the range of 0.01 to 0.5 μm, and particles of 5 μm or more are 0.1% or less. And (c) the specific surface area is 8.0 m ² / g or more, preferably (d) an average measured by a laser light diffraction / scattering particle size distribution measuring instrument Measured from particle size and morphological photo by scanning electron microscope The ratio between the average particle diameter of primary particles is 5 or more was, and satisfies the. Each condition will be described in detail below.

The first requirement of the metal hydrate used in the present invention is that (a) the average particle size calculated based on the volume-based particle size distribution measured by a laser light diffraction / scattering particle size distribution meter is 1 to 1. It is a requirement to be in the range of 10 μm.
That is, the metal hydrate used in the present invention has an average particle diameter (arithmetic average diameter) of 1 to 10 μm calculated based on a volume-based particle size distribution measured by a laser light diffraction / scattering particle size distribution measuring device. It is essential that it has the following range, preferably 1 to 7 μm, more preferably 1 to 5 μm, and still more preferably 99% or more of the cumulative amount of particles is in the range of 0.1 to 20 μm. It is desirable.
In the present invention, particles having an average particle size in the range of 1 to 10 μm measured based on the volume reference particle size distribution measured by a laser light diffraction / scattering particle size distribution measuring device form an aggregate structure of primary particles. Although expressed by the arithmetic average diameter of the mixture of the secondary particles and the primary particles, the secondary particles having a substantially aggregated structure are mainly used.
When the average particle size is less than 1 μm, the mechanical properties are good, but the impact strength is improved, so that the easy-cut property which is the subject of the present invention may be lowered. Moreover, when it exceeds 10 micrometers, there exists a possibility that mechanical physical property and surface smoothness may fall.
The laser light diffraction / scattering particle size distribution measuring device is a method of irradiating a particle with laser light and analyzing the particle size distribution from the light intensity distribution of the diffracted / scattered light emitted from the particle, as described later. In general, a particle size distribution measuring apparatus using these principles is commercially available, and measurement can be performed by using these apparatuses.

The second requirement for the metal hydrate used in the present invention is that (b) from a morphological photograph taken by a scanning electron microscope, it is observed that secondary particles composed of aggregates formed from primary particles are included. The length average particle size based on the number-based particle size distribution in the major axis direction of the primary particles measured from the above is in the range of 0.01 to 0.5 μm, and the particles of 5 μm or more are 0.1% or less. Requirement.
That is, in the metal hydrate used in the present invention, the particles satisfying the average particle diameter of (a) are average length based on the number-based particle size distribution in the major axis direction measured from a morphological photograph by a scanning electron microscope. It is essential that the particle size is in the range of 0.01 to 0.5 μm, and that the aggregates formed from the aggregate structure of primary particles in which particles of 5 μm or more are 0.1% or less, preferably average The particle size is in the range of 0.04 to 0.3 μm, more preferably 0.05 to 0.2 μm, and preferably 3 μm or more of primary particles is 0.1% or less. When the average particle size of the primary particles is less than 0.01 μm, it becomes difficult to handle the powder, and mechanical properties such as tensile strength and elongation may be lowered due to excessive aggregation. If it exceeds 0.5 μm, there is a possibility that it is difficult to form an aggregated structure. If many primary particles with a coarse particle size are included, the mechanical properties and smoothness may be lowered. Therefore, the primary particles having a particle size of 5 μm or more should be 0.1% or less in the number-based particle size distribution. However, when expressed by a length reference particle size distribution, the primary particles of 5 μm or more are 5% or less, preferably 3 μm or more of primary particles are 5% or less.

The measurement method of the average length particle size based on the number-based particle size distribution in the major axis direction measured from a morphological photograph of primary particles by a scanning electron microscope is, for example, “Powder-Theory and Application-” edited by Teruichiro Kubo et al. (Revised Second Edition) pp. 443-541 (Maruzen Co., Ltd .: issued on May 15, 1985), edited by Masafumi Arakawa et al., “Material Design of Latest Powders”, pp. 103-116 (Techno System Co., Ltd .: June 1988) A well-known microscopy method outlined on the 15th) can be used. Specifically, an appropriate primary image obtained from a scanning electron microscope, preferably a morphological photograph with a magnification of about 2000 to 50000 times, preferably about 5000 to 20000 times, by a field emission type scanning electron microscope having higher resolution. The major axis is measured for about 200 to 1,000 particles, and the length average particle diameter is determined. Further, an amount containing a particle size of 5 μm or more is obtained from the integrated value of the number-based particle size distribution obtained by this method.
By the way, in measuring the particle size of non-uniform particles with a microscope, a ferret diameter or a biaxial average diameter is generally used, but in the present invention, the crystal form is a flat hexagonal crystal (hexagonal plate or rounded corners). In some cases, a metal hydrate having an elliptical plate shape or the like is used, and it is considered that a correlation with physical properties such as surface smoothness can be obtained by using a value in a major axis direction of a plane instead of a flat minor axis direction. The number of particles to be measured is preferably several hundreds in the case of a sample having a uniform crystal form and about several thousand in the case of a sample having a non-uniform crushing form.

The third requirement of the metal hydrate used in the present invention, the BET specific surface area of (c) a metal hydrate, 8.0 m ² / g or more, preferably 8.0~50m ² / g, more Preferably it is 10-30 m < ² > / g. When the specific surface area by the BET method is 8.0 m ² / g or more, it is possible to obtain a flame retardant composition having good flame retardancy. By the way, it is presumed that there is a relative relationship between the particle size and the specific surface area. Generally, the finer the particles, the more the specific surface area tends to increase. Therefore, the particles having the average particle size of 1 to 5 μm are B) It is not irrelevant to the fact that particles having an average particle size of 0.01 to 0.5 μm and particles of 5 μm or more are formed by the aggregation structure of fine primary particles of 0.1% or less, and as a result, good mechanical properties; It exhibits high flame retardancy as well as easy cutting.
Here, the measurement method of the specific surface area by the BET method is a method for calculating the specific surface area of the particles by the gas adsorption method, and adsorbs gas molecules having a known adsorption occupation area such as nitrogen gas in advance, This is a method of calculating the specific surface area of particles from the amount of adsorption.
As a specific measurement method, for example, after performing a pretreatment such as deaeration of the sample (particles) at a predetermined temperature and a predetermined time using a fully automatic gas adsorption amount measuring apparatus, which will be described later, which is generally commercially available, Measured using an adsorbed gas such as nitrogen gas.

As the fourth requirement, the metal hydrate used in the present invention was further measured from (iv) an average particle diameter measured by a laser light diffraction / scattering particle size distribution measuring instrument and a morphological photograph taken by a scanning electron microscope. It is desirable that the ratio of the average particle size of the primary particles satisfies the requirement of 5 or more.
That is, the particles having an average particle diameter of 1 to 5 μm measured in (a) are expressed by the arithmetic average diameter of the mixture of the secondary particles and the primary particles forming the aggregate structure of the primary particles as described above. Specifically, it can be easily observed by performing the above-described morphological observation that the secondary particles having an aggregated structure are the main particles.
Therefore, if this aggregate is expressed more quantitatively as an aggregate structure of primary particles, an aggregate structure of primary particles having an average particle diameter of 0.01 to 0.5 μm is formed, and an average particle diameter of 1 to 5 μm is substantially formed. Assuming that the particles are measured as secondary particles, it can be interpreted that the larger the ratio of the average particle diameter to the primary particles, the more aggregated.
In the present invention, it is desirable that the ratio is 5 or more, preferably 10 or more, more preferably 15 or more.
If the ratio is less than 5, the effect of easy cutting of the present invention may be small.
The metal hydrate of the present invention seems to be able to achieve the required physical properties in which mechanical strength and easy-cutting properties conflict with each other due to the presence of such an aggregate structure. In other words, the coexistence of the fine primary particles and the aggregates thereof cause the micro aggregates to break at the time of impact fracture while maintaining the mechanical strength and surface smoothness that are considered to be caused by the primary particles. It is assumed that easy cutability seems to be balanced at a high level.

  The (B) metal hydrate used in the present invention is not particularly limited as long as it satisfies the above (a) to (c), preferably (d). For example, magnesium hydroxide, A single or a combination of two or more compounds having a hydroxyl group or crystal water such as aluminum hydroxide, calcium hydroxide, basic magnesium carbonate, hydrated aluminum silicate, hydrated magnesium silicate, basic magnesium carbonate, hydrotalcite Can be mentioned. Among these metal hydrates, (B1) magnesium hydroxide and (B2) aluminum hydroxide are preferable, and magnesium hydroxide is most preferable from the viewpoint of thermal stability during molding. In addition, those subjected to surface treatment are particularly preferable.

  The (B) metal hydrate used in the present invention is not particularly limited as long as it satisfies the above (a) to (c), preferably (d). For example, magnesium hydroxide, A single or a combination of two or more compounds having a hydroxyl group or crystal water such as aluminum hydroxide, calcium hydroxide, basic magnesium carbonate, hydrated aluminum silicate, hydrated magnesium silicate, basic magnesium carbonate, hydrotalcite Can be mentioned. Among these metal hydrates, (B1) magnesium hydroxide and (B2) aluminum hydroxide are preferable, and magnesium hydroxide is most preferable from the viewpoint of thermal stability during molding. These are particularly preferably subjected to surface treatment.

The above-mentioned (B1) magnesium hydroxide retains the superiority of the present invention as long as it has the average particle size, specific surface area and aggregated structure which are the requirements of the above (a) to (c), more preferably (2). Therefore, the manufacturing method is not particularly limited. Therefore, it can be produced by a known method in the same manner as magnesium hydroxide generally used in flame retardant resin compositions.
In the present invention, in particular, those formed from mixed particles containing fine primary particles having an average particle diameter and secondary particles having an agglomerated structure formed from the primary particles have mechanical strength, surface smoothness and easy cutting. It is preferable because a powder having a high specific balance and high specific surface area can be obtained.
As a method for producing these powders, the synthesis method is most preferable.
As this synthesis method, (i) a solution obtained by adding an alkaline substance to an aqueous solution containing a magnesium salt, more specifically, for example, magnesium chloride or magnesium nitrate is used as the magnesium salt, sodium hydroxide as the alkaline substance, A method for producing magnesium hydroxide by the action of ammonia water, potassium hydroxide, calcium hydroxide or the like (see, for example, JP-A-2-229712, JP-A-7-97210 and JP-T-2001-508015) A method in which a small amount of sodium hydroxide is added to magnesium hydroxide and subjected to pressure and heat treatment in an autoclave or the like (for example, see Japanese Patent Publication No. 3-60774), and pressure heat treatment in a basic magnesium salt aqueous medium. (For example, see JP-A-5-208810) Magnesium chloride obtained by treating hydrochloric acid with natural minerals (eg, brucite, serpentine, dolomite, chlorite) or magnesium oxide contained in natural minerals (eg, magnesite) is leached with ammonium chloride. The magnesium chloride obtained in this manner is used as a magnesium salt, and examples thereof include magnesium hydroxide obtained by reacting with calcium hydroxide and performing precipitation, washing, concentration, drying, and the like (see, for example, JP-A-8-67515). ), (Ii) obtained by hydrating magnesium oxide, more specifically, for example, magnesium oxide obtained by dissolving, purifying and pyrolyzing a natural mineral containing magnesium, or natural mineral (for example, Oxidation obtained by firing magnesium carbonate produced as magnesite) With magnesium, which hydrated, dried magnesium hydroxide obtained, and the like (e.g., Kokoku 7-42461, JP 2000-202318, JP-reference). Magnesium hydroxide synthesized by such a production method appropriately controls the reaction pressure, reaction temperature, pH of aqueous solution in the production process, or the pulverization time, mill speed, etc. in the pulverization process when natural minerals are used. By doing so, it is desirable from the viewpoint that the average particle diameter, the specific surface area, or the aggregated structure, which are the requirements of the above (a) to (c) and (d), are easily obtained.
As another production method, (iii) a method of obtaining natural brucite as an aqueous slurry, wet-grinding, solid-liquid separation, and drying (see, for example, Japanese Patent Publication No. 7-42461), (iV ) A method (for example, see JP-A No. 2000-202318) obtained by pulverizing coarsely ground brucite ore in a pulverizer.

  Further, the magnesium hydroxide has a uniform primary particle size and a flame retardant composition, in which the primary particles are not irregular in shape and have a crystal structure with flat hexagonal crystals. The dispersibility is improved, and as a result, it is more preferable to improve various physical properties such as good mechanical properties, flame retardancy and surface smoothness. Such a crystal structure can be confirmed by morphological observation using the scanning electron microscope or the like.

In addition, (B) the metal hydrate can be treated with a surface treatment agent (E) to improve the dispersion effect in the thermoplastic resin, acid resistance, moisture absorption resistance, deactivation of metal active sites, and the like. preferable.
(E) Examples of the surface treatment agent include fatty acids and fatty acid metal salts or mixtures thereof, fatty acid esters, fatty acid amides, waxes or modified products thereof, curable resins, organic silanes, organic titanates, organic boranes, and the like. In recent years, as disclosed in JP 2002-167219 A, JP 2002-173682 A, JP 2003-003167 A, JP 2004-337698 A, and the like, polycarboxylic acid-based dispersions are disclosed. Magnesium hydroxide surface-treated with an agent, polyglycerin derivative, N-acyl basic amino acid, or dibasic acid erythritol ester, phosphate ester, phosphite ester, alcohol phosphate ester, phosphorus compound, etc. is also used. Yes.
In the present invention, although not particularly limited thereto, a combination of a fatty acid and a fatty acid metal salt or a mixture thereof, and a fatty acid ester is particularly preferred from the viewpoint of inexpensiveness and effectiveness. These may be surface-treated in advance, or a resin component, magnesium hydroxide and the like may be mixed and used simultaneously.

  The fatty acid is preferably a saturated or unsaturated acid having 8 or more carbon atoms, octanoic acid, decanoic acid, myristic acid, behenic acid, palmitic acid, stearic acid, oleic acid, arachidic acid, coconut oil, beef tallow, large Examples include bean oil, palm oil, castor oil, and hardened oil.

  Examples of the fatty acid metal salt include metal salts such as stearic acid, oleic acid, palmitic acid, linoleic acid, lauric acid, caprylic acid, behenic acid, and montanic acid, and the metals include Na, K, Al, Ca, Mg, Zn, Ba, Co, Sn, Ti, Fe etc. are mentioned.

  Examples of the fatty acid ester include methyl laurate, methyl myristate, methyl palmitate, methyl stearate, methyl oleate, methyl erucate, methyl behenate, butyl laurate, butyl stearate, isopropyl myristate, isopropyl palmitate, Examples include monoesters such as octyl palmitate, octyl palmitate, octyl stearate, special beef tallow fatty acid octyl ester, lauryl laurate, stearyl stearate, long chain fatty acid higher alcohol ester, behenyl behenate, cetyl myristate, etc. Neopentyl polyol long chain fatty acid ester, partially esterified product of neopentyl polyol long chain fatty acid ester, neopentyl polyol fatty acid ester, neopentyl polyol medium chain Fatty acid esters, neopentyl polyol C9 chain fatty acid esters, dipentaerythritol long chain fatty acid esters, special fatty acid esters such as complex medium chain fatty acid esters.

These surface treatment agents can be used in any treatment method such as a wet method or a dry method, but in the case of a wet method such as adding a surface treatment agent when forming magnesium hydroxide in an aqueous solvent, As a result of the efficient surface treatment of magnesium oxide, there is a concern that it is difficult to form aggregates. On the other hand, the dry method is a method of dry-treating a surface treatment agent after production of magnesium hydroxide, a method of using a surface treatment agent by a method such as using as a dispersant at the time of mixing with a resin, and the dry method is a surface treatment method. preferable.
(E) The surface treatment agent is used in an amount of 0.5 to 10% by mass, preferably 1 to 8% by mass, based on (B) the metal hydrate.

(C) Scratched whitening inhibitor (C) Scratched whitening inhibitor used in the flame retardant resin composition of the present invention includes (c1) mineral oil, wax or paraffins, (c2) higher fatty acids or esters, amides or metal salts thereof. , (C3) silicone, (c4) a partial fatty acid ester of a polyhydric alcohol, an aliphatic alcohol, a fatty acid, an aliphatic amine, a fatty acid amide, an alkylene oxide adduct of a compound selected from alkylphenol and alkylnaphthol. At least one. This will be described in detail below.

  (C1) Mineral oil, waxes and paraffins include mineral oils such as process oils; waxes such as microwaxes and polyethylene waxes; paraffins such as liquid paraffins and natural paraffins.

(C2) Higher fatty acids and their esters, amides, and metal salts include erucic acid, oleic acid, stearic acid, palmitic acid, linoleic acid, linolenic acid, sorbitan fatty acid, diglycerin fatty acid, pentaerythritol fatty acid, dipentaerythritol fatty acid, Higher fatty acids such as polyoxyethylene fatty acid; butyl stearate, stearic acid monoglyceride, oleic acid monoglyceride, 12-oxystearic acid, polyoxyethylene (5) glycerin monostearate, polyoxyethylene (20) glycerin monostearate, poly Higher fatty acid esters such as oxyethylene (5) monooleate; erucic acid amide, oleic acid amide, stearic acid amide, ethylene hydroxy stearamide, methylene bisstearamide, ethylene bis Tearoamido composite amide.
Examples of the metal salt of higher fatty acid include magnesium stearate, zinc stearate, calcium stearate, barium stearate, zinc laurate and the like.

  (C3) Examples of silicone include silicone oil, silicone oligomer, silicone rubber, silicone resin, and the like, and higher fatty acid-modified silicone oil is most preferable.

  (C4) Partial fatty acid ester of polyhydric alcohol or aliphatic alcohol-, fatty acid-, aliphatic amino-, fatty acid amide-, alkylphenol-, and alkylene oxide adduct of alkylnaphthol include the above fatty acids, sorbitan monostearate Condensates such as ethylene oxide and propylene oxide are added to sorbitan fatty acid esters such as rate and sorbitan monopalmitate, glycerin fatty acid esters, diglycerin fatty acid esters, pentaerythritol fatty acid esters, and fatty acid amides. The alkylene oxide has 2 to 4 carbon atoms. The addition ratio of alkylene oxide is suitably 1 to 30 mol for ethylene oxide and 1 to 10 mol for propylene oxide. These may be added alone or in combination. It may be random or block.

  Among the components (C), higher fatty acid amides such as oleic acid amide and stearic acid amide, and silicones such as higher fatty acid-modified silicone oil are preferable, and higher fatty acid amides are particularly economical because they are inexpensive.

(D) Functional group containing polyolefin resin In the flame-retardant resin composition of this invention, (D) functional group containing polyolefin resin can be mix | blended as needed. The functional group-containing polyolefin resin has (A) good compatibility with the thermoplastic resin, (B) the coupling effect with magnesium hydroxide is remarkable, the mechanical strength of the flame retardant resin composition, at the time of combustion It is used as a role of promoting the formation of carbonized layer (char) and improving flame retardancy.
Examples of the (D) functional group-containing polyolefin resin include olefins and α, β-unsaturated carboxylic acid random copolymers or metal salts thereof and modified polyolefin resins.
The olefin and α, β-unsaturated carboxylic acid random copolymer is a copolymer of an olefin such as ethylene or propylene and an acid anhydride group-containing monomer such as (meth) acrylic acid or maleic anhydride, Among them, an anhydride group-containing olefin random copolymer is preferable.

The acid anhydride group-containing olefin-based random copolymer or a metal salt thereof is a copolymer of an olefin such as ethylene or propylene and an acid anhydride group-containing monomer such as maleic anhydride, and as described above, the present invention. It can be used as an ethylene / α, β-unsaturated carboxylic acid ester copolymer for other flame retardant resin materials, but it can be modified to improve flame retardancy and mechanical strength in the same way as modified polyolefin resins. It can be used as a quality resin.
Examples of the acid anhydride group-containing monomer include the comonomers mentioned above as a copolymer of ethylene and an α, β-unsaturated carboxylic acid or a derivative thereof. Preferred copolymers include ethylene / maleic anhydride copolymers, ethylene / maleic anhydride / vinyl acetate copolymers, ethylene / maleic anhydride / methyl acrylate copolymers, ethylene / maleic anhydride / acrylic acid. Binary or ternary copolymers such as ethyl copolymers can be mentioned. Examples of the metal of the metal salt include K, Na, Li, Ca, Zn, Mg, and Al.
Moreover, the compounding quantity of an acid anhydride group containing olefin type random copolymer or its metal salt is 1-30 mass% with respect to the resin component containing (A) polyolefin resin, Preferably it is 1-20 mass%, Furthermore, it is preferable to mix | blend 1-10 mass%.

  The modified polyolefin resin includes (i) an unsaturated carboxylic acid or derivative thereof, (ii) an epoxy group-containing compound, (iii) a hydroxyl group-containing compound, (iv) an amino group-containing compound, (v) an organosilane compound, ( vi) A polyolefin resin modified with a functional group-containing compound such as an organic titanate compound may be mentioned.

  (I) Unsaturated carboxylic acids or derivatives thereof include acrylic acid, methacrylic acid, furan acid, crotonic acid, vinyl acetic acid, pentenoic acid and other unsaturated monocarboxylic acids; maleic acid, fumaric acid, citraconic acid, itaconic acid And α, β-unsaturated dicarboxylic acids or anhydrides thereof, or metal salts thereof.

  As the above (ii) epoxy group-containing compound, glycidyl acrylate, glycidyl methacrylate, itaconic acid monoglycidyl ester, butenetricarboxylic acid monoglycidyl ester, butenetricarboxylic acid diglycidyl ester, butenetricarboxylic acid triglycidyl ester and α-chloroallyl, Examples include glycidyl esters such as maleic acid, crotonic acid, and fumaric acid, or glycidyl ethers such as vinyl glycidyl ether, allyl glycidyl ether, glycidyloxyethyl vinyl ether, and styrene-p-glycidyl ether, and p-glycidyl styrene. Preferable examples include glycidyl methacrylate and allyl glycidyl ether.

  Examples of the (iii) hydroxyl group-containing compound include 1-hydroxypropyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and hydroxyethyl (meth) acrylate.

  Examples of the (iv) amino group-containing compound include tertiary amino groups such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and dibutylaminoethyl (meth) acrylate.

  Examples of the organic silane compound (v) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetylsilane, and vinyltrichlorosilane.

  Examples of the (vi) organic titanate compound include tetraisopropyl titanate, tetra-n-butyl titanate, tetrakis (2-ethylhexoxy) titanate, and titanium lactate ammonium.

  The content of the functional group-containing compound in the modified polyolefin resin is selected in the range of 0.05 to 10% by mass, preferably 0.1 to 8.0% by mass. If the said content is less than 0.05 mass%, the effect of this invention is not enough and the possibility that the coupling effect of resin and a flame retardant may not be exhibited arises. Moreover, when it exceeds 10 mass%, there exists a possibility that decomposition | disassembly and a crosslinking reaction may occur simultaneously when denatured.

The modified polyolefin resin is obtained by modifying a functional group-containing compound by heating in the presence of an organic peroxide. The functional group-containing compound content is 0.05 to 10% by mass, or the modified product is mixed with an unmodified polyolefin resin and the content is adjusted to the above range.
As the polyolefin resin used for the modification, the polyolefin resin and a mixture thereof can be used. Among these, an ethylene homopolymer or an ethylene / α-olefin copolymer having a density of 0.87 to 0.97 g / cm ³ can be mentioned. Excellent compatibility with magnesium hydroxide, maintaining heat resistance without impairing flexibility of soft resin, promoting formation of carbonized layer during combustion, improving flame retardancy, and improving mechanical strength Most preferred.

(F) Other components In the flame-retardant resin composition of the present invention, in order to further improve performance, combined use of metal hydrates such as magnesium hydroxide and aluminum hydroxide not included in the present invention, flame retardant aid You may mix | blend additives, such as an agent.
Red flame retardant, antimony trioxide, antimony pentoxide, calcium phosphate, zircon oxide, titanium oxide, zinc oxide, magnesium oxide, calcium carbonate, magnesium carbonate, barium sulfate, barium borate, barium metaborate, boron Zinc acid, zinc metaborate, molybdenum disulfide, clay, diatomaceous earth, kaolinite, montmorillonite, hydrotalcite, talc, silica, white carbon, zeolite, hydromagnesite, organic bentonite, and the like may be used in combination. These flame retardant aids are desirably blended up to 50% by mass with respect to the (B) metal hydrate.

  Furthermore, the flame retardant resin composition of the present invention can be blended with various additives and auxiliary materials in accordance with the intended use within a range that does not impair the characteristics of the present invention. These additives and auxiliary materials include stabilizers, antioxidants, UV absorbers, light stabilizers, antistatic agents, processability improvers, fillers, copper damage inhibitors, neutralizers, foaming agents, and bubbles. Examples thereof include an inhibitor, a colorant, process oil, and carbon black. Moreover, it can also bridge | crosslink by adding a crosslinking agent, for example, an organic peroxide, sulfur, a silane type crosslinking agent, and a crosslinking adjuvant, or irradiating with ionizing radiation.

2. Composition ratio of component When the composition ratio of each component in the flame retardant resin composition of the present invention is composed of component (A), component (B), and component (C), (A) 100 mass of thermoplastic resin Part (B) metal hydrate is 30 to 250 parts by weight, preferably 50 to 200 parts by weight, more preferably 80 to 150 parts by weight. 20 parts by mass, preferably 0.5 to 5 parts by mass. (B) If the amount of the metal hydrate is less than 30 parts by mass, the flame retardancy will be insufficient, and if it exceeds 250 parts by mass, the mechanical strength will be reduced. In addition, if the blending amount of the (C) scratch whitening inhibitor is less than 0.05 parts by mass, the effect of preventing whitening with scratches is small, and if it exceeds 20 parts by mass, mechanical properties such as tensile strength may be lowered. In addition to this, even when blended more than this, the effect of preventing scratching and whitening is not changed, and it is not desirable in terms of cost.

Moreover, when comprised with a component (A), a component (B), a component (C), and a component (D), 1-30 mass% (A) thermoplastic resin and (D) functional group containing polyolefin polymer ( However, (B) 30 to 250 parts by mass of a metal hydrate and (C) an anti-bleaching whitening inhibitor is 0 with respect to 100 parts by mass of a resin component composed of (A) + (D) is 100% by weight). It is comprised with the resin composition which consists of 0.05-20 mass parts. When the component (B) is less than 30 parts by mass, the flame retardancy is not sufficient, and when it exceeds 250 parts by mass, the material becomes hard and the flexibility and mechanical strength of the product may be lost. There is a risk of harm such as scratching and whitening.
The component (D) is not necessarily required when the resin component is sufficiently soft, but is generally 1 to 30% by mass, preferably 1 to 20% by mass, more preferably 1 to 10% by mass. % Is preferably blended. By the presence of this component (D), a coupling effect between the resin component and (B) magnesium hydroxide is produced, and a carbonized layer is formed at the time of combustion, thereby improving flame retardancy. Moreover, even if it mix | blends the quantity exceeding 30 mass%, not only the improvement of the mechanical strength beyond it can be expected, but there exists a possibility that material may become hard on the contrary.

3. Production of Flame Retardant Resin Composition The flame retardant resin composition of the present invention comprises the aforementioned component (A), component (B), component (C), and optionally component (D). Mix in any order in proportion, knead and granulate using a normal kneader such as single screw extruder, twin screw extruder, super mixer, Henschel mixer, Banbury mixer, roll mixer, Brabender plastograph, kneader. Can be obtained. In this case, it is preferable to select a kneading and granulating method capable of improving the dispersion of each component, and it is preferable to knead and granulate using a twin screw extruder.

4). Use of flame retardant resin composition The flame retardant resin composition of the present invention is a resin composition excellent in various properties such as flame retardancy, easy cutability, mechanical strength, and surface smoothness. It can be used for insulation layers and / or sheath layers, semiconductive layers, etc., such as cables and optical fiber cables. Electric wires, cords, cables, and optical fiber cables using the flame-retardant resin composition of the present invention for the insulating layer and / or the sheath layer have good product appearance, terminal cutting treatment efficiency, excellent workability, workability, etc. It has the following characteristics.

5. Electric wire / cable The electric wire / cable of the present invention is an electric wire / cable using the above composition, and is an insulating layer, a sheath layer, an internal semiconductive layer and / or an external semiconductive layer, or optionally copper, aluminum, You may provide the coating layer normally provided in an electric wire, a cable, etc., such as an external metal shielding layer, such as lead, and a water shielding layer wound with aluminum tape or the like. Moreover, the manufacturing method of this electric wire and cable may be a general method, and may be used by crosslinking or non-crosslinking, and is not particularly limited. Further, it may be used by foaming, such as a communication cable, or may be used by being laminated with another base material such as a thermoplastic resin or a metal foil.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to a following example, unless the summary is exceeded. The measurement / test methods used in Examples and Comparative Examples and the materials used are as follows.

1. Measurement / Test Method (1) Density The density was measured based on the test method of JIS K6922-1 (1997).
(2) Melt mass flow rate (MFR)
Based on the test method of JIS K6922-1 (1997), measurement was performed under condition D (temperature 190 ° C., load 21.18 N).
(3) Measurement of average particle diameter The average particle diameter of the metal hydrate (magnesium hydroxide) was measured using a laser diffraction / scattering particle size distribution measuring apparatus LA-920 manufactured by Horiba, Ltd. The product was adjusted to the following transmittance and added, and after ultrasonic treatment for 1 minute, it was calculated based on the volume reference distribution measured under the following conditions, and the average particle diameter (arithmetic average diameter) was obtained. .
Transmittance (L): 80-90%
Transmittance (H): 70-80%
Relative refractive index: 1.14
Shape factor: 1.0
Number of data acquisition: 10 times Number of repetitions: 15 (4) Measurement of average particle size of primary particles and confirmation of aggregation structure Using palladium field emission scanning electron microscope S-800 manufactured by Hitachi, Ltd., platinum palladium was added to a magnesium hydroxide sample. After vapor deposition, the morphology was observed under the following conditions to confirm the presence or absence of an agglomerated structure.
Acceleration voltage: 15 kV
Working distance: 15mm
Observation magnification: Photographing at 2000 to 30000 times Subsequently, from the obtained photograph, each major axis was measured with respect to appropriate magnesium hydroxide under the following conditions, and the length average particle diameter and logarithmic particles of 0.01 to 10 μm were measured. A number-based distribution consisting of diameter categories was determined.
Number of particles to be measured: 200 to 300 in a uniform crystal structure having flat crystals and flat hexagonal crystals
In a non-uniform crushing structure, about 1300 pieces Observation magnification: 5000 to 30000 times (5) Measurement of specific surface area by BET method Using a fully automatic powder specific surface area measuring device AMS-8000 manufactured by Okura Riken, magnesium hydroxide is about 0.00. After 3 g of pretreatment by nitrogen flow for 15 minutes at 250 ° C., the specific surface area was measured with liquid nitrogen using the following adsorption gas.
Adsorption gas amount: 30% nitrogen / 70% helium
(6) Oxygen index Based on the test method of JIS K7201-1 (1999), it was measured using an IV type test piece punched from a press sheet having a thickness of 3 mm. Large numbers indicate excellent flame retardancy.
(7) Easy cutability Based on a test method for tensile impact strength (JIS K7160 (1996)), measurement was performed using a 4 type test piece punched from a 1 mm thick press sheet. It was used as an index (the lower the value, the better the cutting performance and the better the cutting ability).
(8) Tensile strength and elongation Based on the JIS C3005 (2000) 4.16 insulator and sheath tensile test method, a tensile speed of 200 mm was obtained using a dumbbell-shaped No. 3 test piece punched from a 1 mm thick press sheet. / Min.
(9) Damage start point A test piece of 30 × 150 mm is cut out from a 1 mm thick press sheet, a sapphire needle of R = 2.5 mm is set up perpendicular to the sheet surface, a load is applied on it, and a 2000 mm / min. The sheet was moved at speed. At that time, visual observation was performed, and the load (g) when the sheet was damaged and whitened was taken as the scratch start point.

2. Materials used (A1) Polyolefin resin (a1) Ethylene / ethyl acrylate copolymer (EEA)
MFR: 0.8 g / 10 min, ethyl acrylate content: 15% by mass
Brand Name: Lexpearl EEA, A1150 Nippon Polyethylene Co., Ltd. (a2) Ethylene / vinyl acetate copolymer (EVA)
MFR: 1 g / 10 min, vinyl acetate content: 15% by mass
Brand Name: Novatec EVA, LV430 Nippon Polyethylene Co., Ltd. (a3) Linear low density polyethylene (LLDPE)
MFR: 0.6 g / 10 min, density: 0.922 g / cm ³
Brand Name: Novatec LL, UE320 Nippon Polyethylene Co., Ltd. (A2) Olefin Elastomer (a4) Ethylene / 1-octene Copolymer MFR: 0.5 g / 10 min, Density: 0.863 g / cm ³
Brand Name: Engagement 8180 Dow Chemical Japan Co., Ltd.

(B) Metal hydrate (b1) Magnesite ore (magnesium carbonate) is fired at about 850 ° C. and then pulverized, and lightly pulverized with a fine powder having an average particle size of 3 μm using a laser light diffraction / scattering particle size distribution analyzer I got magnesia. The obtained light-burned magnesia was stirred in water at a concentration of 30% by weight and a temperature of about 50 ° C., and hydrated in an alkaline solution to which 0.2% by weight of sodium hydroxide was added to the light-burned magnesia for about 2 hours. After the reaction, filtration under reduced pressure, washing with water, and drying at 120 ° C. for about 2 hours. In the obtained magnesium hydroxide, it was confirmed by a scanning electron microscope that uniform primary hexagonal primary particles formed an aggregated structure (see FIGS. 1A and 1B). The average particle diameter is 2.7 μm (see FIG. 6) measured by a laser diffraction / scattering particle size distribution measuring device, and the length is based on the number-based particle size distribution in the major axis direction of primary particles measured from a morphological photograph using a scanning electron microscope. This was magnesium hydroxide having a mean particle size of 0.11 μm, primary particles of 0% (see FIG. 11) of 5 μm or more, and a BET specific surface area of 16 m ² / g. The physical properties are shown in Table 1.

(B2) To an aqueous 15 mol / l magnesium chloride solution obtained from bitter broth, an equivalent aqueous calcium hydroxide solution was added at 40 ° C. with stirring at a rate of about 2 l / h and reacted. The obtained magnesium hydroxide was filtered under reduced pressure and washed with water. Thereafter, 6 l of water per 15 mol of magnesium hydroxide was added and subjected to hot water treatment at 250 ° C. for about 8 hours in an autoclave, followed by filtration under reduced pressure, washing with water, and drying at 120 ° C. for about 2 hours. In the obtained magnesium hydroxide, it was confirmed by a scanning electron microscope that the primary particles of flat crystals had an aggregated structure (see FIGS. 2-a and 2-b), and the average particle size was 4.2 μm. (See FIG. 7) The primary particles had a length average particle size of 0.12 μm, primary particles of 5 μm or more were 0% (see FIG. 12), and the BET method specific surface area was 23 m ² / g of magnesium hydroxide. . The physical properties are shown in Table 1.

(B3) To an aqueous 15 mol / l magnesium chloride solution obtained from bitter juice, an equivalent aqueous calcium hydroxide solution was added at 40 ° C. with stirring at a rate of about 2 l / h and reacted. The obtained magnesium hydroxide was filtered under reduced pressure, washed with water, and dried at 120 ° C. for about 2 hours. In the obtained magnesium hydroxide, it was confirmed by a scanning electron microscope that the primary particles of flat crystals had an aggregated structure (see FIGS. 3-a and 3-b), and the average particle size was 6.2 μm. (Refer to FIG. 8) Magnesium hydroxide having a primary particle length average particle size of 0.14 μm, primary particles of 5 μm or more being 0% (see FIG. 13), and a BET specific surface area of 38 m ² / g. It was. The physical properties are shown in Table 1.

(B4) Magnesium hydroxide produced by pulverizing brucite ore (natural magnesium as a main component) and mixing a surface treatment agent by a dry method (brand name: Magsees W-R4, manufactured by Kamishima Chemical Co., Ltd.) Was measured in the same manner as above, and was confirmed to be a mixture of primary particles from fine particles to coarse particles and aggregates thereof by a scanning electron microscope (see FIG. 4), and the average particle size was 3.8 μm. (Refer to FIG. 9), the primary particles have a length average particle size of 0.40 μm, primary particles of 5% or more of 0.4% (see FIG. 14), and a BET specific surface area of 6.5 m ² / g. It was magnesium. The physical properties are shown in Table 1.

(B5) Magnesium hydroxide (brand name: Kisuma 5A, manufactured by Kyowa Chemical Industry Co., Ltd.) synthesized from magnesium chloride obtained from seawater and mixed with a surface treatment agent by a wet method is the same as above. Measured and composed of relatively uniform primary particles by a scanning electron microscope, almost no aggregation structure was confirmed (see FIG. 5). Further, the average particle diameter is 2.2 μm (see FIG. 10), the primary particle length average particle diameter is 0.68 μm, and the primary particles of 5 μm or more are 0% (see FIG. 15), and the BET specific surface area is 4. It was 9 m ² / g magnesium hydroxide. The physical properties are shown in Table 1.

(C) Anti-whitening agent (c1) Oleic acid amide (OA), manufactured by Nippon Seika Co., Ltd. (c2) Erucic acid amide (EA), manufactured by Nippon Seika Co., Ltd. (c3) Carbana wax (WAX), Noda Wax Co., Ltd. (c4) Higher Fatty Acid Modified Silicon Oil (MSi), TSF410, Toshiba Silicon Co., Ltd. (c5) Dimethyl Silicon Oil (Si), TSF451, Toshiba Silicon Co., Ltd.

(E) Surface treatment agent (e1) Stearic acid (F) Carbon black (VULKAN 9A32 manufactured by CBOT CORPORATION)

(Example 1)
(A1) 85 mass% of ethylene / ethyl acrylate copolymer, (a3) 100 mass parts of polyethylene resin composed of 15 mass% of linear low density polyethylene, (b1) 120 mass parts of magnesium hydroxide, (E ) Mixing 3.5 parts by weight of (e1) stearic acid as a surface treatment agent, and mixing with magnesium hydroxide / stearic acid 123. obtained by mixing with a 20 L super mixer at a temperature of about 80 ° C. and a rotation speed of 600 rpm for 30 minutes. As a whitening inhibitor, 5 parts by mass and (c1) a composition comprising 0.5 part by mass of oleic acid amide and 1.5 parts by mass of carbon black was rotated at about 50 rpm for 10 minutes using a 100 L tumbler mixer. Mixing was performed. The obtained mixture was kneaded, extruded and pelletized under the following conditions to obtain a flame retardant resin composition.
(Ii) Kneading conditions Extruder: Twin screw extruder NCM50 manufactured by Nakatani Manufacturing Co., Ltd.
Kneader temperature / number of revolutions: 180 ° C./500 rpm
Screw part temperature / rotation speed: 170 ° C./65 rpm
(Iii) Preparation of test piece The obtained flame-retardant resin composition was roll-kneaded at 140 ° C for 5 minutes and then press-molded to obtain press sheets having a thickness of 1 mm and a thickness of 3 mm.
Test pieces were prepared from the press sheet, each test was performed, and the test results are shown in Table 2.

(Example 2)
As a whitening inhibitor, a flame retardant resin composition was obtained in the same manner as in Example 1 except that the amount of (c1) oleic acid amide was 2.0 parts by mass. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 2.

(Example 3)
As a whitening inhibitor, a flame retardant resin composition was obtained in the same manner as in Example 1 except that the amount of (c1) oleic acid amide was 5.0 parts by mass. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 2.

Example 4
A flame retardant resin composition was obtained in the same manner as in Example 1 except that (c2) 2.0 parts by mass of erucic acid amide was used as the whitening inhibitor. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 3.

(Example 5)
A flame retardant resin composition was obtained in the same manner as in Example 1 except that 1.0 part by mass of (c4) higher fatty acid-modified silicone oil (MSi) was used as the whitening inhibitor. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 3.

(Example 6)
As a whitening inhibitor, a flame retardant resin composition was obtained in the same manner as in Example 5 except that the amount of (c4) higher fatty acid-modified silicone oil (MSi) was 5.0 parts by mass. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 3.

(Example 7)
A flame retardant resin composition was obtained in the same manner as in Example 1, except that 3.0 parts by mass of (c5) dimethyl silicone oil (Si) was used as the whitening inhibitor. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 3.

(Example 8)
A flame retardant resin composition was obtained in the same manner as in Example 1 except that 3.0 parts by mass of (c3) wax (WAX) was used as a whitening inhibitor. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 3.

Example 9
(A2) 85 mass% of ethylene / vinyl acetate copolymer, (a3) 100 mass parts of polyethylene resin consisting of 15 mass% of linear low density polyethylene, (b1) 120 mass parts of magnesium hydroxide, (E) As a surface treating agent, (e1) 3.5 parts by mass of stearic acid was mixed, and a magnesium hydroxide / stearic acid mixture obtained by mixing with a 20 L supermixer at a temperature of about 80 ° C. and a rotation speed of 600 rpm for 30 minutes 123. 5 parts by mass and a composition obtained by blending 2.0 parts by mass of oleic acid amide and 1.5 parts by mass of carbon black as an anti-whitening agent were mixed and kneaded in the same manner as in Example 1. Extrusion was performed to obtain a flame retardant resin composition. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 4.

(Example 10)
(A1) 90% by mass of ethylene / ethyl acrylate copolymer, and 100 parts by mass of (a4) polyethylene-based resin consisting of 10% by mass of ethylene / 1-octene copolymer as an elastomer, (b1) 120% by mass of magnesium hydroxide (E) 3.5 parts by mass of stearic acid (E1) as a surface treating agent was mixed in a part, and magnesium hydroxide / stearic acid obtained by mixing with a 20 L super mixer at a temperature of about 80 ° C. and a rotation speed of 600 rpm for 30 minutes. A mixture obtained by mixing 123.5 parts by mass of (2) and 2.0 parts by mass of (c1) oleamide and 1.5 parts by mass of carbon black was mixed and kneaded in the same manner as in Example 1. Extrusion was performed to obtain a flame retardant resin composition. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 4.

(Examples 11 to 12)
(A1) 85 mass% of ethylene / ethyl acrylate copolymer, (a3) 100 mass parts of polyethylene resin consisting of 15 mass% of linear low density polyethylene, 120 mass of magnesium hydroxide of (b2) and (b3) (E) 3.5 parts by mass of stearic acid as a surface treating agent was mixed with the part, and magnesium hydroxide / stearin obtained by mixing with a 20 L supermixer at a temperature of about 80 ° C. and a rotation speed of 600 rpm for 30 minutes. A composition comprising 123.5 parts by mass of an acid mixture and 2.0 parts by mass of oleic acid amide (c1) and 1.5 parts by mass of carbon black as a whitening inhibitor, in the same manner as in Example 1. The mixture was kneaded and extruded to obtain a flame retardant resin composition. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 4.

(Comparative Example 1)
A flame retardant resin composition was obtained in the same manner as in Example 1 except that (c1) oleic acid amide which is a whitening inhibitor was not used. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 2.

(Comparative Example 2)
A flame retardant resin composition was obtained in the same manner as in Example 1 except that the amount of (c1) oleic acid amide, which is a whitening inhibitor, was 0.03 parts by mass. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 2.

(Comparative Example 3)
A flame retardant resin composition was obtained in the same manner as in Example 1 except that 0.03 parts by mass of (c4) higher fatty acid-modified silicone oil (MSi), which is a white inhibitor, was used. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 2.

(Comparative Example 4)
A flame retardant resin composition was obtained in the same manner as in Example 1 except that the amount of (c1) oleic acid amide as the white inhibitor was 25.0 parts by mass. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 2.

(Comparative Examples 5-6)
(A1) Ethylene / ethyl acrylate copolymer 85% by mass, (a3) Magnesium hydroxide of (b4) and (b5) 120% by mass with 100 parts by mass of polyethylene-based resin consisting of 15% by mass of linear low density polyethylene (E) 3.5 parts by mass of stearic acid (E1) as a surface treating agent was mixed in a part, and magnesium hydroxide / stearic acid obtained by mixing with a 20 L super mixer at a temperature of about 80 ° C. and a rotation speed of 600 rpm for 30 minutes. A mixture obtained by mixing 123.5 parts by mass of (2) and 2.0 parts by mass of (c1) oleamide and 1.5 parts by mass of carbon black was mixed and kneaded in the same manner as in Example 1. Extrusion was performed to obtain a flame retardant resin composition. Using the obtained flame-retardant resin composition, a press sheet was prepared and tested in the same manner as in Example 1. The test results are shown in Table 4.

[Evaluation results]
Examples 1 to 8 and Comparative Examples 1 to 4 are flame retardant compositions using the specified magnesium hydroxide (b1), and show the influence of the blending amount of the whitening inhibitor. Examples 1 to 8 of the present invention have secondary particles composed of a mixture of primary particles and aggregates thereof, so that easy cutting properties are good (low tensile impact strength) and a large specific surface area by the BET method is large. It is highly flame retardant and has improved scratch start points. On the other hand, in Comparative Examples 1 to 3, the scratch start point is low, and in Comparative Example 4, 25 parts of oleic acid amide is added to the blending system of Comparative Example 1, and the scratch start point is greatly improved. However, the strength balance was very poor, slipping occurred during extrusion, and bleeds occurred on the surface by adjusting the condition after preparing the test piece (23 ° C. 48 hours).

  Examples 4 to 8 show the influence of the type of anti-whitening agent. Example 4 is a system using erucic acid amide instead of oleic acid amide of Example 1, and a specified magnesium hydroxide ( By using b1), easy cutting properties are good (low tensile impact strength), and since the specific surface area is large, flame retardancy is also high. Furthermore, the erucic acid amide compound has a high scratch start point.

  Examples 5 and 6 are systems using higher fatty acid-modified silicone oil (MSi) instead of oleic amide of Example 1, and easy cutability is good by using prescribed magnesium hydroxide (b1). (Low tensile impact strength), high flame retardancy and higher flame retardant properties due to the effect of higher fatty acid-modified silicone oil. Due to the blending of higher fatty acid-modified silicone oil, the scratching start point is also high.

  Example 7 is a system using dimethyl silicone oil instead of the oleic acid amide of Example 1 described above, and by using the prescribed magnesium hydroxide (b1), the easy-cut property is good (the tensile impact strength is low). Low), high flame retardancy, and the flame retardancy increased due to the effect of dimethyl silicone oil (Si). Due to the blending of dimethyl silicone oil, the scratch-resistant starting point is also high.

  Example 8 is a system using wax (WAX) instead of the oleic amide of Example 1 described above, and easy cutability (low tensile impact strength) is achieved by using the specified magnesium hydroxide (b1). It is good and has high flame retardancy, and the start point with scratch resistance is high due to the blending of WAX.

  In Example 9, the base resin of Example 2 described above was replaced from (a1) an ethylene / ethyl acrylate copolymer to (a2) an ethylene-vinyl acetate copolymer (EVA). Easily cut, tensile strength, flame retardancy, good scratch resistance, etc. are good and well balanced.

  Example 10 is a mixture of (a1) ethylene / ethyl acrylate copolymer and (a4) ethylene / 1-octene copolymer, which is a polyolefin-based elastomer, but is easy to cut, tensile strength, flame retardant. Property, good scratch resistance, etc. are good and well balanced.

  Examples 11 and 12 were evaluated by replacing the magnesium hydroxide of (b1) of Example 1 with the magnesium hydroxide of (b2) and (b3), but are equivalent to Example 1 and easily cut. Property, tensile strength, flame retardancy, good scratch resistance, etc. are good and well balanced.

In Comparative Examples 5 to 6, magnesium hydroxides (b4) and (b5) outside the scope of the present invention were used, and the tensile impact strength was high (easy cut property was deteriorated) and the test was rejected.

  The flame retardant resin composition of the present invention retains the performance of conventional non-halogen flame retardant resin compositions, and includes various properties such as flame retardancy, easy cutability, mechanical strength, surface smoothness, scratch resistance and whitening resistance. Since it is a resin composition excellent in performance, it can be used for insulating layers and / or sheath layers of electric wires, cables, optical fiber cables and the like. In addition, electric wires, cables, optical fiber cables and the like using the flame retardant resin composition of the present invention have excellent surface smoothness, excellent product appearance, and easy cutability, so that the end cutting processability is improved. It is excellent in workability and workability and can be suitably used industrially.

It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 20,000 times) of magnesium hydroxide b1. Uniform primary particles are observed. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 5,000 times) of magnesium hydroxide b1. It is observed that the primary particles form an aggregate structure. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 30,000 times) of magnesium hydroxide b2. Uniform primary particles are observed. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 5000 times) of magnesium hydroxide b2. It is observed that the primary particles form an aggregate structure. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 30,000 times) of magnesium hydroxide b3. Uniform primary particles are observed. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 5,000 times) of magnesium hydroxide b3. It is observed that the primary particles form an aggregate structure. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 5,000 times) of magnesium hydroxide b4. It is observed that non-uniform particles can be observed and that minute particles are aggregated. It is a form photograph (Hitachi, Ltd. field emission type scanning electron microscope S-800, 5,000 times) of magnesium hydroxide b5. Uniform primary particles that do not form an aggregated structure are observed.

3 is a volume-based particle size distribution of magnesium hydroxide b1 (Laser diffraction / scattering particle size distribution measuring apparatus LA-920 manufactured by Horiba, Ltd.). It is a volume standard particle size distribution (Laser diffraction / scattering type particle size distribution measuring apparatus LA-920, manufactured by Horiba, Ltd.) of magnesium hydroxide b2. It is a volume-based particle size distribution of magnesium hydroxide b3 (Laser diffraction / scattering particle size distribution measuring apparatus LA-920 manufactured by Horiba, Ltd.). 3 is a volume-based particle size distribution of magnesium hydroxide b4 (Laser diffraction / scattering particle size distribution measuring apparatus LA-920 manufactured by Horiba, Ltd.). 3 is a volume-based particle size distribution of magnesium hydroxide b5 (Laser diffraction / scattering particle size distribution measuring apparatus LA-920, manufactured by Horiba, Ltd.). It is the number standard particle size distribution (measured from Hitachi, Ltd. field emission scanning electron microscope S-800, 20,000 times) in the major axis direction of magnesium hydroxide b1. It is a number standard particle size distribution (measured from Hitachi, Ltd. field emission scanning electron microscope S-800, 30,000 times) in the major axis direction of magnesium hydroxide b2. It is a number standard particle size distribution (measured from Hitachi, Ltd. field emission scanning electron microscope S-800, 30,000 times) in the major axis direction of magnesium hydroxide b3. It is a number standard particle size distribution (measured from Hitachi, Ltd. field emission scanning electron microscope S-800, 10,000 times) in the major axis direction of magnesium hydroxide b4. It is the number standard particle size distribution (measured from Hitachi, Ltd. field emission scanning electron microscope S-800, 5,000 times) in the major axis direction of magnesium hydroxide b5.

Claims (9)

A flame retardant resin composition comprising the following (A), (B) and (C):
(A) 100 parts by mass of a thermoplastic resin (B) 30 to 250 parts by mass of a metal hydrate that satisfies the following conditions (a) to (c) (a) Measured with a laser diffraction / scattering particle size distribution meter The average particle diameter (arithmetic average diameter) calculated based on the volume-based particle size distribution is in the range of 1 to 10 μm. (B) Aggregates formed of primary particles from a morphological photograph taken by a scanning electron microscope Is observed to contain secondary particles, and the length average particle size based on the number-based particle size distribution in the major axis direction of the primary particles measured from the morphological photograph is in the range of 0.01 to 0.5 μm, In addition, the particle size of 5 μm or more is 0.1% or less. (C) The specific surface area by the BET method is 8.0 m ² / g or more. (C) At least one selected from the following (c1) to (c4) Seed scratching whitening inhibitor 0.05-20 mass (C1) Mineral oil, wax or paraffin (c2) Higher fatty acid or ester, amide or metal salt thereof (c3) Silicone (c4) Partial fatty acid ester of polyhydric alcohol, aliphatic alcohol, fatty acid, aliphatic amine, fatty acid amide , An alkylene oxide adduct of a compound selected from alkylphenols and alkylnaphthols (B) The flame retardant resin composition according to claim 1, wherein the metal hydrate further satisfies the following condition (d):
(D) The ratio of the average particle diameter measured by a laser light diffraction / scattering particle size distribution measuring instrument to the average particle diameter of primary particles measured from a morphological photograph by a scanning electron microscope is 5 or more.   The flame retardant resin composition according to claim 1 or 2, wherein the (B) metal hydrate is (B1) magnesium hydroxide and / or (B2) aluminum hydroxide.   The flame retardant resin composition according to claim 3, wherein (B1) magnesium hydroxide is produced by a synthesis method.   (B1) Magnesium hydroxide obtained by a synthesis method is obtained by adding an alkaline substance to an aqueous solution containing a magnesium salt, or obtained by hydrating magnesium oxide. The flame-retardant resin composition as described.   The flame retardant resin according to any one of claims 1 to 5, wherein the (A) thermoplastic resin is a resin containing (A1) a polyolefin resin and / or (A2) a thermoplastic elastomer. Composition. (A) The thermoplastic resin is an ethylene / unsaturated carboxylic acid ester copolymer, an ethylene / vinyl ester copolymer, and an ethylene / α-olefin copolymer having a density of 0.86 to 0.94 g / cm ^3. The flame-retardant resin according to claim 6, wherein the resin comprises 100 to 20% by mass of (A1) a polyolefin-based resin and (A2) 0 to 80% by mass of a selected thermoplastic elastomer. Composition.   (A) The thermoplastic resin further contains (D) a functional group-containing polyolefin resin 1 to 30% by mass (provided that the total of (A) + (D) is 100% by weight). Item 8. The flame retardant resin composition according to any one of items 1 to 7. The electric wire and cable using the flame-retardant resin composition of any one of Claims 1-8.