JP2008007730A - 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 thermoplastic resin such as a polyolefin-based resin composition, a thermoplastic elastomer, etc., mixed with a metal hydrate, has excellent easy-to-cut performance, prevention of resin waste deposited near outlet of extruder, flame retardance and smoothness, not to mention excellent physical properties such as tensile strength, an electric wire and a cable using the same. <P>SOLUTION: The flame-retardant resin composition comprises comprising (A) 100 parts by mass of a thermoplastic resin, (B) 30-250 parts by mass of a metal hydrate satisfying (i) an average particle of 1-10μm 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 of ≥8.0m<SP>2</SP>/g and (C) 0.1-5 parts by mass of an agent for preventing resin waste deposited near outlet of extruder. The electric wire and the cable are obtained by using the same. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention eliminates the generation of toxic gases such as halogen gas during combustion, is excellent in flame retardancy and mechanical characteristics, prevents eyes from being burned, enables continuous operation when forming electric wires and cables, and overcomes easy cut characteristics In particular, the present invention relates to a resin composition suitably used for an insulating layer and a sheath layer of an electric wire / cable, and an electric wire / cable using the 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 polyvinyl chloride, a resin composition (non-halogen flame retardant material) in which a metal hydroxide such as magnesium hydroxide is blended with a polyolefin resin has been proposed (for example, Patent Document 1).

In such a resin composition, in order to impart flame retardancy to the polyolefin-based resin, generally the same amount of metal hydrate as the resin component in the composition is used depending on the required level of flame retardancy. It is necessary to add to a high concentration. For this reason, in order to reach a high flame retardant level, the amount of the matrix resin has to 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. In Patent Document 2, 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, which has high flame retardancy and mechanical properties. Good resin compositions have 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 the coating layer and the insulating layer from the core wire with a jig or the like. In Patent Document 3, a resin composition comprising 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 with respect to 100 parts by weight of a polyolefin-based resin. Has been proposed. Use of metal hydrate with a large specific surface area improves the flame retardancy. By reducing the amount added to the resin, physical properties such as flame retardancy and extrudability, appearance of molded products, tensile properties, flexibility, etc. A method for achieving both has been proposed. However, in this method, since the mechanical properties are improved by relatively increasing the amount of the matrix resin, it is estimated that the tensile impact strength is also high, and there remains a problem that it is difficult to perform the end cutting process at the time of wiring construction. .

  As a method for solving the above-mentioned end cutting treatment, Patent Document 4 discloses a flexible and tensile impact by blending a soft material and / or a liquid emulsifier in addition to an ethylene polymer, a functional group-containing olefin polymer and an inorganic flame retardant. A method of obtaining a resin composition having low strength and good terminal treatment efficiency. Further, in Patent Document 5, a polyethylene resin having a specific density is blended in addition to an ethylene polymer, a functional group-containing olefin polymer, and an inorganic flame retardant. Thus, a method for obtaining a resin composition having low tensile impact strength and good terminal treatment efficiency has been proposed.

In addition, these resin compositions contain a large amount of metal hydrate, which is an inorganic flame retardant, in order to achieve high flame retardancy. There is also a problem that a large amount of precipitates called “ani” are generated and continuous operation for a long time is impossible.
In particular, in order to satisfy the easy cutting property, the object is easily achieved by blending a large amount of metal hydrate and sacrificing mechanical strength such as tensile strength. As described above, blending a large amount of metal hydrate to achieve high flame retardancy and easy cutability generates a large amount of spear on the die lip.

  In addition, these flame retardant resin compositions containing a large amount of metal hydrate have a defect that they easily whiten by absorbing moisture in the air. As a method for eliminating this whitening phenomenon, a composition containing mineral oil, wax, higher fatty acid and the like has been proposed as shown in Patent Document 6, but these proposed compositions satisfy easy cutting properties. It will not be a thing.

  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 performance can be improved by increasing the amount of metal hydroxide, but at the same time, physical properties such as lowering of tensile strength and trauma resistance are reduced, and the overall balance is achieved. Nothing has been obtained. Furthermore, the poor cutability affects the workability when stripping the coating material during the on-site construction of the electric wire and the appearance after the construction. In addition, these flame retardant resin compositions contain a large amount of inorganic flame retardants, and in the case of electric wires and cables, they are used in black, red, green, etc. The whitening phenomenon becomes remarkably conspicuous, and the flexibility and workability also deteriorate.

Japanese Unexamined Patent Publication No. 7-149965 JP 2005-139388 A JP 2005-179409 A JP 2005-029604 A, JP 2005-029605 A Japanese Patent Publication No.7-119324

  In view of the above-mentioned problems of the prior art, the object of the present invention is to prevent the generation of toxic gases such as halogen gas during combustion, and is excellent in flame retardancy and mechanical properties, and prevents spears. It is a flame retardant resin composition that can be continuously operated and overcomes easy-cut characteristics, and is particularly used for a resin composition that is suitably used for an insulating layer and a sheath layer of electric wires and cables, and the composition. The purpose is to provide electric wires and cables.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that thermoplastic resins, preferably polyolefin-based resins and / or thermoplastic elastomers, have primary particles having an average particle size in a specific range, and further aggregate structures of primary particles. A resin composition containing a specific amount of a metal hydrate having a feature of having a large specific surface area and secondary particles composed of aggregates formed of Overcoming the shortcomings of thermoplastic resin compositions such as polyolefin resin compositions and thermoplastic elastomers blended in large quantities, while maintaining performance such as high flame retardancy, tensile strength, smoothness, flexibility, and workability The present invention has been completed by finding that it can be an excellent flame-retardant resin composition that solves both the easy-cut performance (terminal cutting treatment) and the eye-repellency prevention performance at the same time.

That is, the first invention of the present invention provides 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 satisfying the following conditions (a) to (c)
[Metal hydrate]
(B) The average particle diameter (arithmetic average diameter) calculated based on the volume-based particle size distribution measured by a laser light diffraction / scattering particle size distribution measuring device is in the range of 1 to 10 μm. From a morphological photograph taken with a scanning electron microscope, it was observed that secondary particles composed of aggregates formed of primary particles were included, and the length was based on the number-based particle size distribution in the major axis direction of the primary particles measured from the morphological photograph. The average particle size is in the range of 0.01 to 0.5 μm, and 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 and 0.1-5 parts by mass of (C) eye stain inhibitor selected from the following (1) to (3) with respect to 100 parts by mass of the resin component [eye stain inhibitor]
(1) A 12-hydroxystearic acid metal salt and / or a basic 12-hydroxystearic acid metal salt (2) a fluorine elastomer (3) a carboxylic acid amide-based wax.

The second invention of the present invention provides the flame retardant resin composition according to the first invention, wherein (B) 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.

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

  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.

  According to an eighth invention of the present invention, in any one of the first to seventh inventions, (D) a thermoplastic resin is further added to (D) a functional group-containing polyolefin resin of 1 to 30% by mass (however ( A flame retardant resin composition comprising: A) component and (D) component is 100% by mass) 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.

  The flame retardant resin composition of the present invention includes a primary particle having an average particle diameter in a specific range and a secondary particle formed of an aggregate structure composed of primary particles, and has a feature of having a large specific surface area By blending a specific amount of hydrate, the performance of the conventional non-halogen flame retardant resin composition is maintained, and it is highly effective in preventing discoloration during molding. High flame retardancy and easy cutability ( A resin composition capable of providing an electric wire / cable excellent in various performances such as terminal cutting treatment) and mechanical strength, product appearance, etc., and an electric wire using the flame-retardant resin composition in an insulating layer and / or a sheath layer, The cable is excellent in the above-mentioned various performances, is hardly generated in the eyes, has easy cutability (end cutting treatment) at the time of on-site construction, and has excellent workability.

  The present invention comprises (A) a thermoplastic resin, preferably (A1) a polyolefin resin and / or (A2) 100 parts by mass of a resin component containing a thermoplastic elastomer, (B) a metal hydrate, preferably (B1) Magnesium hydroxide and / or (B2) 30 to 250 parts by mass of aluminum hydroxide, and (C) 0.1 to 5 parts by mass of anti-smudge agent, and (D) functional group-containing polyolefin resin 1 to 1 as necessary. A flame retardant resin composition containing 30% by mass (where the total amount of the component (A) + the component (D) is 100% by mass), 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 by ethylene, ethylene copolymer of at least one monomer selected from ethylene and α, β-unsaturated carboxylic acid, α, β-unsaturated carboxylic acid ester, vinyl ester, polypropylene resin, etc. At least one polyolefin-based resin selected from the group consisting of:
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.
Examples of the metal salt include K, Na, Li, Ca, Zn, Mg, and Al.

(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 0.01 to 100 g / 10 minutes, more preferably 0.1 to 50 g / 10 minutes, and still more preferably 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 Elastomer Examples of the styrene elastomer include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), styrene-isoprene-butadiene-styrene copolymer (SIBS), and the like. 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 by the BET method is 8.0 m ² / g or more, preferably (d) further measured by a laser light diffraction / scattering particle size distribution measuring instrument. Average particle size measured by scanning electron microscope The ratio of the average particle size of the measured primary particles from that of 5 or more, 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) based on a volume-based particle diameter distribution measured by a laser light diffraction / scattering particle diameter distribution measuring device in the range of 1 to 10 μm. It is essential that it is a thing, Preferably it is 1-5 micrometers, More preferably, it is the range of 1-3 micrometers, More preferably, it is desirable that 99% or more of the cumulative amount of particles is in the range of 0.1-20 micrometers.
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. On the other hand, if it exceeds 10 μm, the mechanical properties may be lowered.
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, a suitable primary image obtained from a morphological photograph with a magnification of about 2000 to 50000 times, preferably about 5000 to 30000 times by a scanning electron microscope, preferably 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, ferret diameter or biaxial average diameter is generally used. In the present invention, however, the crystal form is flat or hexagonal (hexagonal plate or Since there is a case of a metal hydrate having an elliptical plate shape with a corner, etc., a correlation with physical properties such as surface smoothness is obtained by using a value in the major axis direction of the plane instead of a flat minor axis direction. I thought. 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 is 8.0 m ² / g or more, a favorable flame-retardant flame retardant composition can be obtained. On the other hand, if the specific surface area is too large, when the metal hydrate is mixed in a large amount, the fluidity at the time of melting of the flame retardant resin composition may be lowered. Accordingly, the specific surface area of the metal hydrate is desirably 50 m ² / g or less. By the way, it is presumed that there is a relative relationship between the particle diameter and the specific surface area. Generally, the finer the particles, the more the specific surface area tends to increase. Therefore, the particles (a) having an average particle diameter of 1 to 10 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 10 μm measured in (a) are represented by the arithmetic average diameter of the mixture of the secondary particles and the primary particles forming the primary particle aggregate structure 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, when 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 10 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, the particle size ratio is preferably 5 or more, preferably 10 or more and 50 or less, more preferably 15 or more and 40 or less.
If the particle size ratio is less than 5, the effect of easy cutting of the present invention may be small, and if it is 50 or more, when a large amount of metal hydrate is mixed, the flame-retardant resin composition is melted. There is a risk that the fluidity of
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. 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, and sodium hydroxide is used as the alkaline substance. , A method for producing magnesium hydroxide by the action of aqueous ammonia, potassium hydroxide, calcium hydroxide, etc. (see JP-A 61-168522, JP-A-2-229712 and JP-A-7-97210) 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 (see Japanese Patent Publication No. 50-23680), or a method of pressure and heat treatment in a basic magnesium salt aqueous medium (special No. 52-115799) natural mineral containing magnesium (for example, Magnesium chloride obtained by leaching magnesium chloride contained in natural minerals (such as magnesite) with ammonium chloride, obtained by treating lucite, serpentine, dolomite, chlorite, etc.) with hydrochloric acid For example, magnesium hydroxide obtained by a reaction such as precipitation, washing, concentration, and drying by reacting with calcium hydroxide (see JP 2001-508015 A), (ii) magnesium oxide More specifically, for example, it is produced as magnesium oxide obtained by dissolving, purifying, and pyrolyzing natural minerals containing magnesium, or as natural minerals (for example, magnesite). Use magnesium oxide obtained by firing magnesium carbonate. Hydrated, dried magnesium hydroxide obtained, and the like (see Kokoku 3-60774 and JP Hei 5-208810 and JP-A No. 8-67515). 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.
Other production methods include (iii) a method of obtaining natural brucite as an aqueous slurry, wet-grinding, solid-liquid separation, and drying (see Japanese Patent Publication No. 7-42461), (iv) roughing Examples thereof include a method of obtaining a pulverized raw brucite ore by pulverizing with a pulverizer (see JP 2000-202318 A).

  In addition, the magnesium hydroxide has a uniform primary particle size because the primary particles are not irregular in shape and have a crystal structure with flat crystals or flat hexagonal crystals. The dispersibility in the flammable composition is improved, and as a result, it is further preferable for improving 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 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, and organic boranes. In recent years, as disclosed in JP-A-2002-167219, JP-A-2002-173682, JP-A-2003-003167, JP-A-2004-337698, and the like, a polycarboxylic acid-based dispersion is used. 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, a combination with a fatty acid, a fatty acid metal salt or a mixture thereof, and a fatty acid ester is particularly preferable from the viewpoint of being inexpensive and effective, although not particularly limited thereto. 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, 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 esters include methyl laurate, methyl myristate, methyl palmitate, methyl stearate, methyl oleate, methyl erucate, methyl behenate, butyl laurate, butyl stearate, isopropyl myristate, isopropyl palmitate, 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, medium chain fat of neopentyl polyol 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 (E) 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 in the production of magnesium hydroxide in an aqueous solvent. As a result of efficient surface treatment of magnesium hydroxide, 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) Eye stain inhibitor]
The anti-cracking agent (C) of the present invention is selected from the group of (1) 12-hydroxystearic acid metal salt and / or basic 12-hydroxystearic acid metal salt (2) fluorine-based elastomer (3) carboxylic acid amide wax. It is at least one selected, and may be used alone or in combination.

(1) The metal salt of 12-hydroxystearic acid and / or the basic metal salt of 12-hydroxystearic acid is produced by a metathesis precipitation method, a dry direct method or the like. Further, a surface-treated hydroxy higher fatty acid metal salt or the like can also be used. In addition, a basic hydroxy fatty acid metal salt is also included. Basic means that the equivalent of the metal is in excess of the equivalent of the carboxylic acid in the salt of a hydroxy higher fatty acid that is a carboxylic acid and a metal.
Examples of the hydroxy higher fatty acid metal salt include monovalent and divalent metals such as lithium, sodium, calcium, magnesium, and zinc, and fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid. In particular, 12-hydroxy magnesium stearate is most preferable.

  (2) Examples of the fluorine-based elastomer include copolymer elastomers of vinylidene fluoride and chlorotrifluoroethylene, hexafluoropropylene, tetrafluoroethylene, and the like. In particular, a copolymerized elastomer of vinylidene fluoride and hexafluoropropylene is preferably used. The added elastomer is coated on the metal inside the extruder by heat at the time of extrusion molding, and has an effect of reducing the coefficient of friction between the metal and the resin and preventing the occurrence of grease.

  (3) The carboxylic acid amide wax is a polycondensate obtained by a dehydration reaction of a mixture of a higher fatty acid monocarboxylic acid and a polybasic acid and a diamine, and is usually represented by the following general formula (I) It can be done.

Formula (I)
^{R1CO (NHR 2 NH) y 1} (COR 3 CO) x (NHR 2 NH) y 2 COR 1
(Wherein R1 represents a saturated alkyl group having 15 or more carbon atoms, R2 represents an aliphatic or aromatic hydrocarbon group having 2 or more carbon atoms, and R3 represents an aliphatic, aromatic or alicyclic group having 1 or more carbon atoms. Represents a hydrocarbon group, x represents a value in the range of 0.18 to 1.0, and y1 + y2 represents a value in the range of 1.5 to 2.0.)

  These polycondensate carboxylic acid amide waxes represented by the general formula (I) are generally manufactured by Kyoeisha Chemical Co., Ltd. under the trade names of “light amide WH series”, for example, WH-255 and WH-215. It is commercially available.

  The (C) eye stain inhibitor is 0.1 to 5 parts by weight, preferably 0.1 to 4 parts by weight, and more preferably 0.1 to 3 parts by weight with respect to 100 parts by weight of the resin component. Although the effect of preventing eye stains depends on the ratio of the metal hydrate to be filled, the effect of preventing the occurrence of eye stains cannot be exhibited at 0.1 parts by weight or less, and even if the amount exceeds 10 parts by mass, In particular, no further improvement in effect is observed.

(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 (D1) acid anhydride group-containing olefin-based random copolymer or 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, as described above. It can also be used as the ethylene / α, β-unsaturated carboxylic acid ester copolymer of the flame retardant resin material of the present invention, but it has the same flame retardancy and mechanical strength as the modified polyolefin resin. It can be used as a modifying resin to be improved.
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.
The blending amount of the (D1) acid anhydride group-containing olefin random copolymer or the metal salt thereof is 1 to 30% by mass, preferably 1 to 20% by mass, based on (A) the polyolefin resin. Is preferably 1 to 10% by mass (however, the total amount of the component (A) + the component (D) is 100% by mass).

  The (D2) 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, and (v) an organosilane. And (vi) a polyolefin-based resin modified with a functional group-containing compound such as an organic titanate compound.

  (I) Unsaturated carboxylic acids or derivatives thereof include unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, furan acid, crotonic acid, vinyl acetic acid, pentenoic acid; maleic acid, fumaric acid, citraconic acid, itaconic acid And α, β-unsaturated dicarboxylic acids or anhydrides, 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 (V) organosilane compound 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.

  (D2) The content of the functional group-containing compound in the modified polyolefin-based 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. On the other hand, if it exceeds 10% by mass, there is a risk that decomposition and cross-linking reaction may occur at the time of modification.

(D2) The modified polyolefin resin is obtained by modifying a functional group-containing compound by heating in the presence of an organic peroxide. Those having a functional group-containing compound content of 0.05 to 10% by mass, or those obtained by mixing the modified product with an unmodified polyolefin resin and adjusting the content to the above range are used.
As the polyolefin resin used for the modification, the polyolefin resin and a mixture thereof can be used. Specifically, (A1) polyolefin resin includes high-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, high-pressure radical method low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid. (A2) thermoplastic elastomers such as at least one copolymer, ethylene- (meth) acrylic acid ester copolymer, ethylene / α-olefin copolymer rubber, and mixtures thereof.
Among these, an ethylene homopolymer or ethylene / α-olefin copolymer having a density of 0.87 to 0.97 g / cm ³ , among which a modified linear low density polyethylene is the polyolefin resin and magnesium hydroxide. Excellent compatibility with mechanical strength, mechanical strength, etc., maintaining heat resistance without impairing flexibility of soft resin, promoting formation of carbonized layer during combustion, improving flame retardancy, and improving mechanical strength Most preferable because it can be expected.

(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. Further, it can be crosslinked by adding a crosslinking agent such as an organic peroxide, sulfur or a silane-based crosslinking agent or a crosslinking aid, or can be crosslinked by irradiating with ionizing radiation.

2. Composition ratio of components 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 (B) 30 to 250 parts by mass of the metal hydrate and (C) 0.1 to 5 parts by mass of the anti-smudge agent are included.

Further, when it is composed of (A) component, (B) component, (C) component, and (D) component, 100 mass of resin component consisting of (A) thermoplastic resin and (D) functional group-containing polyolefin polymer. (B) 30 to 250 parts by mass of metal hydrate, (C) 0.1 to 5 parts by mass of anti-smudge agent, and (D) 1 to 30 parts by mass of the functional group-containing polyolefin polymer. % Flame retardant resin composition. 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 30% by mass with respect to the thermoplastic resin of the component (A). It is preferable to blend 20% by mass, more preferably 1 to 10% by mass (however, the sum of the component (A) and the component (C) is 100% by mass). 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 (D) component as described below in addition to (A) component, (B) component and (C) component as described above. Mix in any order in proportion and 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 that is excellent in various properties such as flame retardancy and easy cutability, prevention of glazing and mechanical strength, and surface smoothness. It can be used for insulation layers and / or sheath layers, semiconductive layers, flame retardant sheets and the like of electric wires, cords, cables, optical fiber cables and the like. Electric wires, cords, cables, and optical fiber cables using the flame-retardant resin composition of the present invention for the insulating layer and / or sheath layer have good product appearance, terminal cutting 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, lead. It is also possible to provide a coating layer that is usually provided in electric wires, cables, etc., such as an external metal shielding layer such as 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 in a crosslinked or non-crosslinked manner, and is not particularly limited. Moreover, it may be used by being foamed, 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 determined by using a laser diffraction / scattering particle size distribution measuring apparatus LA-920 manufactured by Horiba Ltd. and hydrated in a special grade ethanol solvent. 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 times (4) Measurement of average particle size of primary particles and confirmation of aggregation structure Using a 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, about 1300 in a non-uniform crush structure Observation magnification: 5000 to 30000 times (5) Measurement of specific surface area by BET method Using OMS RIKEN fully automatic powder specific surface area measuring device AMS-8000, about 0.3g of magnesium hydroxide was pre-treated with nitrogen flow for 15 minutes at 250 ° C, and then the specific surface area was measured with liquid nitrogen using the following adsorption gas. It was measured.
Adsorption gas amount: 30% nitrogen / 70% helium
(6) Based on a test method of oxygen index JIS K7201-1 (1999), measurement was performed 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 4.16 insulator and sheath tensile test method of JIS C3005 (2000), using a dumbbell-shaped No. 3 test piece punched from a 1 mm thick press sheet, a tensile speed of 200 mm / Min.
(9) Surface smoothness Extruded strands were prepared from the flame retardant resin composition using a capillograph under the following conditions, and the surface smoothness was visually evaluated as follows.
Equipment specifications: Capillograph 1B manufactured by Toyo Seiki Seisakusho Co., Ltd.
Molding temperature: 210 ° C
Extrusion speed: 10mm / min
Take-off speed: 4m / min
Capillary: length 8mm, diameter 2.1mm
[Evaluation criteria]
○: Glossy and good surface smoothness.
Δ: Glossy, but magnesium hydroxide is not well dispersed.
X: A satin pattern with poor surface smoothness.
(10) Evaluation method of the spears Extruding the pelletized sample with a 40 mmφ extruder using a die with a hole diameter of 2 mm, a land length of 10 mm, and a number of holes of 6 at a set temperature of 220 ° C. and an extrusion rate of 16 kg / hr for 1 hour. The spear eyes were collected and weighed.
Each test result is shown in Table 1.

2. Materials used (A1) Polyolefin resin (a1) Ethylene / ethyl acrylate copolymer 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 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 (ethylene / α-olefin copolymer)
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. 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. (See FIG. 9) Magnesium hydroxide having a primary particle length average particle diameter of 0.40 μm, primary particles of 5 μm or more being 0.4% (see FIG. 14), and a specific surface area of 6.5 m ² / g. there were. 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 size is 2.2 μm (see FIG. 10), the primary particle length average particle size is 0.68 μm, the primary particles of 5 μm or more are 0% (see FIG. 15), and the specific surface area is 4.9 m ^2. / G magnesium hydroxide. The physical properties are shown in Table 1.

(C) Anti-smudge agent (c1) Magnesium 12-hydroxystearate Product name MS-6: Nitto Kasei Co., Ltd.
(C2) Fluorine Elastomer Product Name Dynamar FX-5911: Sumitomo 3M Co., Ltd.
(C3) Carboxylic acid amide wax
Ethylenediamine, stearic acid, sebacic acid polycondensate
Product Name Light Amide WH-255: Kyoeisha Chemical Co., Ltd.

(D) Functional group-containing polyolefin resin (D1) Ethylene / maleic anhydride / methyl acrylate copolymer MFR: 7 g / 10 min Density: 0.93 g / cm ³
Brand name: Lexpearl ET, ET230X Nippon Polyethylene Co., Ltd. (D2) Maleic anhydride-modified linear low-density polyethylene: MFR 2 g / 10 min, linear low-density polyethylene 100 parts by mass with a density of 0.923 g / cm ³ 0.25 parts by weight of maleic anhydride and 0.02 parts by weight of perhexine 25B as an organic peroxide, and melt-kneaded with an extruder to obtain maleic anhydride-modified linear low density polyethylene (anhydrous Maleic acid content 0.2% by weight).

(Example 1)
[Creation of flame retardant resin composition]
(A1) 100 parts by mass of an ethylene / ethyl acrylate copolymer is added (b1) 100 parts by mass of magnesium hydroxide, and (c1) 0.8 parts by mass of 12-hydroxymagnesium stearate is added as an anti-cracking agent. The resulting composition was rotationally mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was kneaded, extruded and pelletized under the following conditions to obtain a flame retardant resin composition.

[Kneading conditions]
Extruder: Nakatani Seisakusho twin screw extruder NCM50
Kneader temperature / number of revolutions: 180 ° C./500 rpm
Screw part temperature / rotation speed: 170 ° C./65 rpm

[Create specimen]
The obtained flame-retardant resin composition was roll-kneaded at 140 ° C. for 5 minutes, and then press-molded to produce press sheets having a thickness of 1 mm and a thickness of 3 mm, which were used for the test. The measurement results are shown in Table 2.

(Example 2)
(A1) Ethylene / ethyl acrylate copolymer 95% by mass (D) As a functional group-containing polyolefin, (D2) 100 parts by mass of a polyethylene resin composition comprising 5% by mass of maleic anhydride-modified linear low-density polyethylene , (B1) 100 parts by mass of magnesium hydroxide and (c1) a composition comprising 0.8 parts by mass of 12-hydroxymagnesium stearate as an anti-fogging agent, about 50 rpm using a 100 L tumbler mixer, Rotating mixing was performed for 10 minutes. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 2.

(Example 3)
(A1) 85 parts by mass of an ethylene / ethyl acrylate copolymer (D) 100 parts by mass of a polyethylene resin composition comprising 15% by mass of an ethylene / maleic anhydride / methyl acrylate copolymer as a functional group-containing polyolefin (D1) (B1) 100 parts by weight of magnesium hydroxide and (c1) a composition prepared by blending 0.8 parts by weight of 12-hydroxy magnesium stearate as an anti-fogging agent is about 50 rpm using a 100 L tumbler mixer. Rotating mixing was performed for 10 minutes. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition. Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 2.

Example 4
(A2) Ethylene / vinyl acetate copolymer 95% by mass (D) As a functional group-containing polyolefin, (D2) 100 parts by mass of a polyethylene resin composition comprising 5% by mass of maleic anhydride-modified linear low-density polyethylene, (B1) Add 100 parts by mass of magnesium hydroxide, and mix (c1) 0.8 parts by mass of 12-hydroxy magnesium stearate as an anti-cracking agent using a 100 L tumbler mixer at about 50 rpm, 10 Rotating mixing was performed for minutes. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 2.

(Example 5)
(A1) 85% by mass of ethylene / ethyl acrylate copolymer (a3) 10% by mass of linear low density polyethylene and (D2) 5% by mass of maleic anhydride-modified linear low density polyethylene as functional group-containing polyolefin A composition obtained by adding 100 parts by mass of (b1) magnesium hydroxide to 0.8 parts by mass of (c1) magnesium 12-hydroxystearate as an anti-tarnish agent, to 100 parts by mass of polyethylene resin consisting of Using a 100 L tumbler mixer, rotary mixing was performed at about 50 rpm for 10 minutes. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 2.

(Example 6)
(A1) Ethylene / ethyl acrylate copolymer 85% by mass, polyolefin elastomer (a4) ethylene / 1-octene copolymer 10% by mass and (D) functional group-containing polyolefin (D2) maleic anhydride 100 parts by mass of (b1) magnesium hydroxide is added to 100 parts by mass of polyethylene resin consisting of 5% by mass of modified linear low density polyethylene, and (c1) 12-hydroxystearic acid magnesium is added as an anti-cracking agent (0.81). The composition obtained by blending parts by mass was rotationally mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 2.

(Example 7)
(A1) Ethylene / ethyl acrylate copolymer 95% by mass (D) As a functional group-containing polyolefin, (D2) 100 parts by mass of polyethylene resin consisting of 5% by mass of maleic anhydride-modified linear low density polyethylene, (B1) A composition obtained by adding 150 parts by mass of magnesium hydroxide and blending 0.8 part by mass of (c1) 12-hydroxymagnesium stearate as an anti-tarnish agent is about 50 rpm using a 100 L tumbler mixer. Rotating mixing was performed for minutes. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 2.

(Examples 8 to 9)
(A1) 100 parts by mass of an ethylene / ethyl acrylate copolymer is added with 100 parts by mass of (b1) magnesium hydroxide, and (c1) 0.3 parts by mass of 12-hydroxymagnesium stearate and 5 parts by mass as an anti-cracking agent. The composition obtained by blending the parts was rotated and mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 3.

(Examples 10 to 11)
(A1) (b1) Magnesium hydroxide (100 parts by mass) is added to 100 parts by mass of an ethylene / ethyl acrylate copolymer, and (c2) fluorinated elastomer (0.2 part by mass), (c3) carboxylic acid amide as an anti-tarnish A composition obtained by blending 0.8 part by mass of a system wax was subjected to rotational mixing at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 3.

(Examples 12 to 13)
(A1) 100 parts by mass of the ethylene / ethyl acrylate copolymer is added with 100 parts by mass of the magnesium hydroxide of (b2) and (b3), and (c1) 0.8 mass of 12-hydroxymagnesium stearate as an anti-cracking agent The composition obtained by blending the parts was rotated and mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 3.

(Comparative Example 1)
(A1) 100 parts by mass of (b1) magnesium hydroxide was added to 100% by mass of an ethylene / ethyl acrylate copolymer, and rotated and mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 4.

(Comparative Example 2)
(A1) 100 parts by mass of ethylene / ethyl acrylate copolymer is added (b1) 100 parts by mass of magnesium hydroxide, and (c1) 0.05 part by mass of 12-hydroxymagnesium stearate is blended as an anti-cracking agent. The resulting composition was rotationally mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 4.

(Comparative Example 3)
(A1) A composition obtained by adding 100 parts by mass of (b1) magnesium hydroxide to 100% by mass of an ethylene / ethyl acrylate copolymer and blending 7 parts by mass of (c1) magnesium 12-hydroxystearate as an anti-tarnish agent. The product was rotationally mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 4.

(Comparative Example 4)
(A1) 100 parts by mass of an ethylene / ethyl acrylate copolymer (b4) 100 parts by mass of magnesium hydroxide and (c1) 0.8 parts by mass of 12-hydroxymagnesium stearate as an anti-cracking agent The resulting composition was rotationally mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 4.

(Comparative Example 5)
(A1) 100 parts by mass of an ethylene / ethyl acrylate copolymer (b5) 100 parts by mass of magnesium hydroxide and (c1) 0.8 parts by mass of 12-hydroxymagnesium stearate as an anti-cracking agent The resulting composition was rotationally mixed at about 50 rpm for 10 minutes using a 100 L tumbler mixer. The obtained mixture was mixed, kneaded and extruded in the same manner as in Example 1 to obtain a flame retardant resin composition.
Using the obtained flame retardant resin composition, a test was performed in the same manner as in Example 1. The test results are shown in Table 4.

[Evaluation results]
(Examples 1 to 13)
In Example 1, by using the specified magnesium hydroxide (b1), high flame retardancy and easy cutability are good, and (C) the amount of eye stain generated by adding an appropriate amount of an eye stain inhibitor At the same time, the tensile properties were greatly improved, the operating time was greatly improved, and it could be used as an excellent non-halogen polyethylene material for extrusion molding.
In Examples 2 and 3, the physical properties were further improved by further adding a functional group-containing polyolefin.
In Examples 4-6, although it was a flame retardant resin composition which changed the kind of thermoplastic resin of (A) component, all had the performance equivalent to Example 2. FIG.
In Example 7, the amount of the flame retardant as the component (B) is increased to 150 parts by mass, and the flame retardancy increases, but the increase in the generation amount of eyes and the tendency to decrease in mechanical strength are observed. As shown, there was no problem with the product.
In Examples 8 and 9, the compounding amount of the eye stain inhibitor was changed, but within the scope of the present invention, the amount of eye dust generation was small, and the performance such as flame retardancy and easy cutability Also provided a satisfactory product.
In Examples 10 and 11, (c2) fluorinated elastomer and (c3) carboxylic acid amide wax were used as an anti-fogging agent. The amount of the product was low, and the product satisfying the performance such as flame retardancy and easy cutability was provided.
In Examples 12 and 13, although the type of magnesium hydroxide of component (B) was changed to (b2) and (b3), it was composed of a mixture of primary particles and aggregates as in Example 1. In addition, the easy-cut property was good (low tensile impact strength), the specific surface area was large, and the flame retardancy was high.

[Comprehensive evaluation]
Examples 1 to 13 were flame retardant compositions using the specified magnesium hydroxide (b1 to b3) and had good cutability because they consisted of a mixture of primary particles and aggregates thereof (tensile impact (B1) Magnesium hydroxide has a high specific surface area, and therefore has high flame retardancy and a small amount of generation of eyes, and is well-balanced.

(Comparative Examples 1-5)
In Comparative Example 1, easy cutting properties (low tensile impact strength) are achieved by using the specified magnesium hydroxide (b1), but the tensile elongation is not ensured and the occurrence of eye cracks is very large. It was not possible to expect a product with realistic driving and good appearance.

In Comparative Example 2, the amount of the (C) anti-fogging agent is small and out of the scope of the present invention. There wasn't.
In Comparative Example 3, the blending amount of the (C) eye stain inhibitor is increased outside the scope of the present invention. Although the amount of generation of eyes is improved to an area where there is no problem, the tensile strength and flame retardancy cannot be secured, and a good product cannot be expected.
Comparative Examples 4 and 5 are those using (b4) natural ore crushed magnesium hydroxide and (b5) synthetic magnesium hydroxide, which are commercially available. Although excellent in properties, the tensile impact strength was high and easy cutability was not achieved.

  The flame retardant resin composition of the present invention retains the performance of the conventional non-halogen flame retardant resin composition, and is excellent in various properties such as flame retardancy, easy cut property, mechanical strength, and surface smoothness. Since it is a thing, it can use for insulation layers and / or sheath layers, such as an electric wire, a cable, and an optical fiber cable. 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. 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 b43 (Laser diffraction / scattering particle size distribution measuring apparatus LA-920 manufactured by Horiba, Ltd.). It is a volume reference | standard particle size distribution (Horiba Ltd. make laser diffraction and scattering type particle size distribution measuring device LA-920) of magnesium hydroxide b54. 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 field emission scanning electron microscope S-800, 10,000 times) in the major axis direction of magnesium hydroxide b43. 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 b54.

Claims (9)

(A) 100 parts by mass of a thermoplastic resin;
(B) 30 to 250 parts by mass of a metal hydrate satisfying the following conditions (a) to (c)
[Metal hydrate]
(B) The average particle diameter (arithmetic average diameter) calculated based on the volume-based particle size distribution measured by a laser light diffraction / scattering particle size distribution measuring device is in the range of 1 to 10 μm. From a morphological photograph taken with a scanning electron microscope, it was observed that secondary particles composed of aggregates formed of primary particles were included, and the length was based on the number-based particle size distribution in the major axis direction of the primary particles measured from the morphological photograph. The average particle size is in the range of 0.01 to 0.5 μm, and 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 and 0.1-5 parts by mass of (C) eye stain inhibitor selected from the following (1) to (3) with respect to 100 parts by mass of the resin component [eye stain inhibitor]
(1) A 12-hydroxystearic acid metal salt and / or a basic 12-hydroxystearic acid metal salt (2) a fluorine elastomer (3) a carboxylic acid amide-based wax. (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. 7. The resin comprising (A1) 100 to 20% by mass of a polyolefin-based resin which is at least one selected ethylene copolymer and (A2) 0 to 80% by mass of a thermoplastic elastomer. The flame-retardant resin composition as described.   (A) The thermoplastic resin further contains (D) a functional group-containing polyolefin resin 1 to 30% by mass (however, the sum of the component (A) and the component (D) is 100% by mass). The flame-retardant resin composition according to any one of claims 1 to 7.   The electric wire and cable using the flame-retardant resin composition of any one of Claims 1-8.