JP5481770B2 - Non-halogen flame retardant resin composition and electric wire and cable using the same - Google Patents

Description

  The present invention relates to a halogen-free flame retardant resin composition suitably used as a coating layer for electric wires and the like, and an electric wire / cable using the resin composition.

  In the internal wiring of OA equipment and electronic equipment such as copiers and printers, a large amount of wire harnesses that supply power and send signals between printed boards and between electronic parts such as printed boards and sensors, actuators, and motors are used.

  A wire harness is an assembly of terminals such as connectors that can be inserted into and removed from a terminal by bundling a plurality of electric wires and cables. From the viewpoints of flame retardancy, electrical insulation, etc., PVC electric wires using polyvinyl chloride (PVC) as an insulating material are used for electric wires for wire harnesses. Since PVC wires are excellent in flexibility, they are easy to handle in the case of a wire harness and have sufficient strength, so there is no problem that the insulator is broken or worn during wiring of the wire harness. Furthermore, it is excellent in the workability of attaching the pressure contact connector attached to the terminal.

  However, since PVC elements contain halogen elements, there is a problem that toxic gas of hydrogen chloride is generated when incinerating the wire harness after use, or dioxin is generated depending on the incineration conditions. Medium PVC that is required to reduce environmental burden is not a preferable material as an insulating material.

  In recent years, halogen-free electric wires using coating materials that do not contain polyvinyl chloride resin or halogen-based flame retardants have been developed in order to meet the increasing demand for reducing the environmental burden. On the other hand, electric wires such as insulated wires and insulated cables used for in-machine wiring of electronic devices are generally required to have various characteristics conforming to UL (Underwriters Laboratories Inc.) standards. The UL standard stipulates in detail various properties such as flame retardancy, heat deformability, low temperature properties, tensile properties after heat aging of coating materials, and the like to be satisfied by products. Among these, regarding flame retardancy, it is necessary to pass a vertical combustion test called a VW-1 test, which is one of the strictest requirements in the UL standard.

  In general, as a coating material for halogen-free electric wires, a flame retardant resin composition prepared by blending a polyolefin resin such as polypropylene with a metal hydroxide (also referred to as a metal hydrate) such as magnesium hydroxide or aluminum hydroxide. It is used. However, in order to pass the vertical combustion test VW-1, it is necessary to mix a large amount of metal hydroxide in the polyolefin resin. As a result, there is a problem that the flexibility and elongation of the coating material are remarkably impaired and the molding processability such as extrusion molding is also lowered.

  For this reason, in Japanese Patent Application Laid-Open No. 2002-105255 (Patent Document 1), a metal hydrate is heated and kneaded with a thermoplastic resin component in which an elastomer such as ethylene propylene rubber or styrene butadiene rubber is blended with polypropylene resin. A flame retardant resin composition is disclosed. Filler receptivity can be increased by blending elastomers, and dynamic vulcanization of these elastomers balances mechanical properties such as flexibility and elongation with extrudability and flame retardancy. Is being considered. However, such materials have poor abrasion resistance and edge resistance as compared with PVC, and there is a problem in that, when trying to improve these characteristics, flexibility is lowered and the balance of characteristics is lost.

On the other hand, a high-strength non-halogen electric wire using a polyphenylene ether resin described in Patent Document 2 or a polyphenylene sulfide resin described in Patent Document 3 as a coating material has also been proposed. Although these resins are excellent in terms of flame retardancy and strength, they have a drawback of poor flexibility and a high extrusion temperature.
JP 2002-105255 A Japanese Patent Laid-Open No. 11-189585

  For the above reasons, non-halogen electric wires that are excellent in mechanical strength such as flame retardancy, flexibility, abrasion resistance, and edge resistance, which are equivalent to PVC, and are useful for reducing environmental burdens are desired. The present inventor has found that the above problem can be solved by combining a nitrogen-based flame retardant with a resin composition containing a polyphenylene ether resin and a styrene elastomer.

  However, the characteristics required for electric wires are becoming more severe, and it is required to have various characteristics that meet not only the UL standard but also the CSA (Canadian Standards Association) standard. There is a heating winding test as a test item of the CSA standard, and it is necessary that no cracking occurs in the coating layer when the electric wire is wound around a double bar with a double diameter and left at high temperature. In a resin composition containing a resin and a styrene-based elastomer, cracks are generated in a heat winding test, and the resin composition may not conform to the CSA standard.

  The present invention has excellent flame resistance, flexibility, mechanical strength such as abrasion resistance, edge resistance, etc. equivalent to PVC, is useful for reducing the environmental load, and is also non-halogen-resistant that is suitable for heating winding tests. It is an object to provide a flammable resin composition and an electric wire / cable using the flame retardant resin composition as a coating layer.

The present invention provides a halogen-free flame retardant resin composition containing 5 to 70 parts by weight of the nitrogen-based flame retardant per 100 parts by weight of the resin component, the resin component 100 parts by weight of a polyamide resin or polyester resin or These mixtures are 20 to 50 parts by mass, 20 to 50 parts by mass of a polyphenylene ether resin, 30 to 60 parts by mass of a styrene elastomer, and 1 to 10 parts by mass of a styrene elastomer having a functional group as a part of the styrene elastomer. It is a non-halogen flame retardant resin composition characterized by containing a part.

  A resin composition containing a polyphenylene ether resin and a styrene elastomer is a polymer alloy having a sea-island structure in which a hard polyphenylene ether resin having a high elastic modulus at normal temperature is used as an island and a styrene elastomer having a large elongation as a sea is used as a sea. It is estimated to be. By alloying resins having different characteristics, it is possible to achieve both mechanical strength such as wear resistance and edge resistance and flexibility.

  The polyphenylene ether resin is an amorphous material having a glass transition temperature of 200 ° C. or higher, and maintains a elasticity (hard) at a temperature lower than the glass transition temperature. On the other hand, a polystyrene block of a styrene elastomer is an amorphous material having a glass transition temperature of 90 ° C. to 100 ° C., and is in a molten state above the glass transition temperature. For this reason, it is estimated that this amorphous two-component polymer alloy is in a state where hard islands are dispersed in a molten sea at a temperature of about 100 ° C. to 200 ° C., and easily breaks when stretched in this state. . When a heating winding test is performed within this temperature range, it is presumed that cracks are generated on the surface of the electric wire because the high temperature elongation of the material is lost.

  If a polyamide resin or a polyester resin or a mixture thereof is further added thereto, a polymer alloy having three or more components is obtained. The glass transition temperature of the polyamide resin and the polyester resin is approximately 20 ° C. to 80 ° C., which is lower than 121 ° C., which is the heating winding test temperature. However, since both are crystalline resins, an appropriate elastic modulus can be maintained and flexibility and extensibility can be maintained even at a temperature higher than the glass transition temperature. In addition, the compatibility with the styrene-based elastomer is relatively high, and if it can be uniformly dispersed in the styrene-based elastomer, the entire structure exhibits high temperature elongation and strength. As a result, it is possible to prevent the occurrence of cracks in a heat winding test at a temperature higher than the glass transition temperature of the styrene elastomer.

The styrene elastomer is preferably a block copolymer elastomer of styrene and a rubber component. When the styrene elastomer is a block copolymer elastomer of styrene and a rubber component, a resin composition having excellent extrudability can be obtained.

The polyphenylene ether resin is preferably a polyphenylene ether resin obtained by melt blending polystyrene. The extrusion processability is improved by using a polyphenylene ether resin obtained by melt blending polystyrene.

The deflection temperature under load of the polyphenylene ether resin is 130 ° C or higher.
It is preferable that When the deflection temperature under load of the polyphenylene ether-based resin is 130 ° C. or higher, a coating layer for an electric wire having high mechanical strength can be obtained.

By containing a styrene elastomer having a functional group as a part of the styrene elastomer, the styrene elastomer having a functional group functions as a compatibilizing agent. By adding a compatibilizing agent, the polyamide resin or polyester resin and the styrene-based elastomer are mixed well, and the high-temperature elongation characteristics are improved. In particular, the polyamide resin is desirably used in combination with a compatibilizing agent.

The nitrogen-based flame retardant is preferably melamine cyanurate. By using melamine cyanurate as a nitrogen-based flame retardant, thermal stability during mixing is improved, and flame retardancy is also improved.

When an electric wire / cable is produced using the halogen-free flame-retardant resin composition of the present invention as a coating layer, a halogen-free insulated wire excellent in flame retardancy, flexibility, mechanical properties, and high-temperature properties can be obtained.

The thickness of the coating layer is preferably 0.3 mm or less. When the thickness of the insulating coating layer is as small as 0.3 mm or less, the mechanical properties such as wear resistance and edge resistance are significantly different from those of the conventional electric wires, and an excellent effect is exhibited.

The coating layer is preferably cross-linked by irradiation with ionizing radiation. Heat resistance and mechanical strength are improved because the coating layer is cross-linked.

  According to the present invention, non-halogen which is excellent in mechanical strength such as flame resistance, flexibility, abrasion resistance, and edge resistance, which is equivalent to PVC, is useful for reducing environmental load, and is also suitable for a heat winding test. A flame retardant resin composition and an electric wire / cable using the flame retardant resin composition can be provided.

  Next, the best mode for carrying out the present invention will be described. Polyphenylene ether is an engineering plastic obtained by oxidative polymerization of 2,6-xylenol synthesized using methanol and phenol as raw materials. In order to improve the moldability of polyphenylene ether, various materials are commercially available as modified polyphenylene ether resins in which polystyrene is blended with polyphenylene ether. As the polyphenylene ether resin used in the present invention, any of the above-mentioned polyphenylene ether resin alone and a polyphenylene ether resin obtained by melt blending polystyrene can be used. Moreover, what introduce | transduced carboxylic acid, such as maleic anhydride, can also be blended suitably and used.

  When a polyphenylene ether resin obtained by melt blending polystyrene is used as the polyphenylene ether resin, workability at the time of melt mixing with the styrene elastomer is preferably improved. Since the polyphenylene ether resin obtained by melt blending polystyrene is excellent in compatibility with the styrene elastomer, the resin pressure during the extrusion process is reduced, and the extrusion processability is improved.

  In such a polyphenylene ether resin, the deflection temperature under load changes depending on the blend ratio of polystyrene. However, when a resin with a deflection temperature under load of 130 ° C or higher is used, the mechanical strength of the electric wire coating increases and thermal deformation occurs. It is preferable because of its excellent characteristics. The deflection temperature under load is a value measured at a load of 1.80 MPa by the method of ISO75-1,2.

  A polyphenylene ether resin not blended with polystyrene can also be used as the polyphenylene ether resin. In this case, if a low-viscosity polyphenylene ether resin is used, the resin pressure during extrusion can be reduced while maintaining the mechanical strength. The intrinsic viscosity of the polyphenylene ether resin is preferably 0.1 to 0.6 dl / g, and more preferably 0.3 to 0.5 dl / g.

  Styrene elastomers used in the present invention include styrene / ethylene butene / styrene copolymers, styrene / ethylene propylene / styrene copolymers, styrene / ethylene / ethylene propylene / styrene copolymers, styrene / butylene / styrene copolymers. Examples thereof include hydrogenated polymers and partially hydrogenated polymers. Moreover, what introduce | transduced carboxylic acid, such as maleic anhydride, can also be blended suitably and used.

  Among these, use of a block copolymer elastomer of styrene and a rubber component is preferable from the viewpoints of improving extrudability, improving tensile elongation at break, and improving impact resistance. Block copolymers include hydrogenated styrene / butylene / styrene block copolymers, triblock copolymers such as styrene / isobutylene / styrene copolymers, styrene / ethylene copolymers, styrene / ethylene propylene, etc. It is preferable that the triblock component in the styrene elastomer is contained in an amount of 50% by weight or more because the strength and hardness of the electric wire coating is improved.

Also, those having a styrene content of 20% by weight or more contained in the styrene elastomer can be suitably used from the viewpoint of mechanical properties and flame retardancy. When the styrene content is less than 20% by weight, the hardness and extrusion processability are lowered. On the other hand, if the styrene content exceeds 50% by weight, the tensile elongation at break decreases, which is not preferable.
Further, the melt flow rate (abbreviated as “MFR”; measured at 230 ° C. × 2.16 kgf in accordance with JIS K 7210) serving as an index of molecular weight is preferably in the range of 0.8 to 15 g / 10 min. This is because if the melt flow rate is smaller than 0.8 g / 10 min, the extrudability is lowered, and if it exceeds 15 g / 10 min, the mechanical strength is lowered.

  Polyamide resin and polyester resin include 6-nylon resin, 12-nylon resin, 6,6-nylon resin, 6-12 nylon resin, MXD-6 resin (semi-aromatic nylon), aliphatic nylon / 6-T nylon Resin (semi-aromatic nylon), PBT (polybutylene terephthalate) resin and the like can be preferably used. In particular, 6-nylon resin and PBT resin can be preferably used because their melting points are close to the glass transition temperature of polyphenylene ether and the extrudability is good. These resins may be added alone, but a resin commercially available as a polymer alloy of a polyphenylene ether resin and a polyamide resin or a polyester resin can also be used.

  Polyamide resin or polyester resin or a mixture thereof, polyphenylene ether resin, styrene elastomer, and polyamide resin or polyester resin can be melt-mixed at an arbitrary ratio. From the viewpoint of properties, the polyamide resin or polyester resin or a mixture thereof is 20 to 50 parts by mass of the whole resin component, the polyphenylene ether resin is 20 to 50 parts by mass of the whole resin component, and the styrene elastomer is 30 to 30 parts of the whole resin component. 60 parts by mass is preferred. When the content of the polyphenylene ether-based resin exceeds 50 parts by mass, the extrudability decreases, and when the content is less than 20 parts by weight, the mechanical strength and flame retardancy are decreased. The more preferable content of the polyamide resin or the polyester resin or a mixture thereof is 25 parts by mass to 40 parts by mass.

  Furthermore, when a styrene-based elastomer having a functional group is contained as a compatibilizing agent, the adhesion between the polyamide resin or polyester resin and the styrene-based elastomer can be improved, and high temperature characteristics can be improved. Examples of the functional group include an epoxy group, an oxazoline group, an acid anhydride group, and a carboxyl group, which can be appropriately selected according to the type of resin. 1-20 mass parts is preferable with respect to 100 mass parts of resin components, and, as for content of a compatibilizing agent, a more preferable range is 1-10 weight part.

  Furthermore, as a resin component, it is possible to mix various resins, such as a polypropylene and a polyethylene, in the range which does not impair the meaning of this invention. A resin composition in which polyethylene and random polypropylene are mixed can be cross-linked by irradiation with ionizing radiation such as an accelerated electron beam or gamma ray, and is therefore suitable when heat resistance needs to be improved.

  Examples of the nitrogen-based flame retardant used in the present invention include melamine resin and melamine cyanurate. Nitrogen-based flame retardants do not generate toxic gases such as hydrogen halides even when incinerated after use, and can reduce the environmental burden. When melamine cyanurate is used as a nitrogen-based flame retardant, it is preferable in terms of heat stability at the time of mixing and an effect of improving flame retardancy.

  Melamine cyanurate can also be used after surface treatment with a silane coupling agent or a titanate coupling agent. Wear resistance and mechanical strength can be improved by combining surface-treated melamine cyanurate with a polyphenylene ether resin or styrene elastomer into which a carboxylic acid has been introduced.

  The content of the nitrogen-based flame retardant is preferably 5 to 70 parts by mass with respect to 100 parts by mass of the resin composition. This is because if the amount is less than 5 parts by mass, the flame resistance of the insulated wire is insufficient, and if it exceeds 70 parts by mass, the elongation and extrusion processability are deteriorated. As for content of a nitrogen-type flame retardant, 10-40 mass parts is further more preferable.

  Moreover, it is preferable that the non-halogen flame retardant resin composition of the present invention does not substantially contain a phosphorus-based flame retardant. The environmental load such as eutrophication of the river can be reduced by substantially not including the phosphorus-based flame retardant. The term “substantially free” means that a flame retardant such as a phosphate ester is not actively added, and a material containing a trace amount of phosphorus component derived from a raw material resin or additive is used in the present invention. It is not excluded from the scope.

  Furthermore, a crosslinking aid can be added to the non-halogen flame retardant resin composition of the present invention. As the crosslinking aid, a polyfunctional monomer having a plurality of carbon-carbon double bonds in the molecule such as trimethylolpropane trimethacrylate, triallyl cyanurate, triallyl isocyanurate and the like can be preferably used. Moreover, it is preferable that a crosslinking adjuvant is a liquid at normal temperature. This is because when it is a liquid, it can be easily mixed with a polyphenylene ether resin or a styrene elastomer. Furthermore, it is preferable to use trimethylolpropane trimethacrylate as a crosslinking aid because compatibility with the resin is improved.

  In the non-halogen flame retardant resin composition of the present invention, an antioxidant, a processing stabilizer, a colorant, a heavy metal deactivator, a foaming agent, a polyfunctional monomer, and the like can be appropriately mixed as necessary. These materials can be prepared by mixing using a known melt mixer such as a short screw extruder, a pressure kneader, or a Banbury mixer.

  Furthermore, this invention provides the electric wire and cable which used said halogen-free flame-retardant resin composition as a coating layer. The electric wire / cable according to the present invention includes a conductor and a coating layer covering the conductor, and a known extruder can be used to form the coating layer on the conductor.

  The thickness of the coating layer can be appropriately selected according to the conductor diameter, but the thickness of the coating layer is preferably 0.3 mm or less in terms of mechanical strength. In the halogen-free electric wire according to the prior art, when the thickness of the covering layer is 0.3 mm or less, the performance is remarkably reduced in wear resistance and edge resistance, but according to the present invention, it is excellent even when the thickness of the covering layer is 0.3 mm or less. Performance is obtained, and the difference from the conventional electric wire is noticeable. Moreover, in the pressure welding electric wire, an electric wire having a coating layer thickness of 0.3 mm or less is preferably used from the viewpoint of fitting property with the connector.

  Furthermore, it is preferable that the coating layer is cross-linked by irradiation with ionizing radiation in that the mechanical strength is improved. Examples of ionizing radiation sources include accelerating electron beams, gamma rays, X-rays, α rays, ultraviolet rays, and the like. However, accelerated electrons are used from the viewpoint of industrial use, such as ease of use of ion sources, transmission thickness of ionizing radiation, and speed of crosslinking treatment. Lines are most preferably available.

  Next, the best mode for carrying out the invention will be described by way of examples. The examples are not intended to limit the scope of the invention.

[Examples and Reference Examples ]
(Creation of non-halogen flame retardant resin composition pellets)
Each component was melt-mixed according to the formulation shown in Tables 1 and 2. Using a twin-screw mixer (45 mmφ, L / D = 42), melt-mixed at a cylinder temperature of 230 ° C. and a screw rotation speed of 100 rpm, melt-extruded into a strand, and then cooled and cut the molten strand to produce pellets .

(Production of insulated wires)
Using a single screw extruder (30 mmφ, L / D = 24), an insulated wire was manufactured by extrusion coating on a conductor. A single-wire tin-plated copper wire (outer diameter 0.8 mm) was used as the conductor, and the coating thickness was 0.125 mm. The extrusion conditions were such that the conductor preheating temperature was 120 ° C, the cylinder temperature was 230 ° C, the die temperature was 240 ° C, and the line linear velocity was 300 mm / min. In addition, the insulated wire of Example 27 was irradiated with an accelerated electron beam so that the irradiation amount was 60 kGray.

(Evaluation of coating layer: tensile properties)
A conductor was extracted from the produced electric wire, and a tensile test of the coating layer was performed. The test conditions were as follows: tensile speed = 50 mm / min, distance between marked lines = 25 mm, temperature = 23 ° C., tensile strength and tensile elongation at break were measured with three samples, and the average value was obtained. A sample having a tensile strength of 10.3 MPa or more and a tensile elongation at break of 100% or more was judged as “pass”.

(Evaluation of coating layer: second modulus)
Using a sample similar to the above tensile test, after performing a tensile test at a tensile rate of 50 mm / min, a distance between marked lines of 25 mm, and a temperature of 23 ° C., the elongation becomes 2% from the stress-elongation curve. The elastic modulus was calculated.

(Evaluation of insulated wires: Flame resistance test)
Ten samples were provided for the VW-1 vertical flame retardant test described in UL Standard 1581, 1080, and when all 10 points passed, it was determined as “pass”. The criterion is that if each sample is ignited 15 seconds 5 times, the fire extinguishes within 60 seconds, the absorbent cotton laid on the bottom is not burned by the burning fallen objects, and the kraft paper attached to the top of the sample burns. Or that does not burn.

(Evaluation of insulated wires: high temperature winding test)
The prepared electric wire was wound around a 1.2 mm and 2.1 mm rod, heated in a thermostatic chamber at 121 ° C. for 1 hour, then taken out from the thermostatic bath, and the presence or absence of cracks was observed. Evaluation was performed using three samples, and the number of wires in which cracks occurred was evaluated. The above results are shown in Tables 1 and 2.

Except having used the resin composition which has the mixing | blending prescription shown in Table 3, the electric wire was produced similarly to the Example and the reference example, and a series of evaluation was performed. The results are shown in Table 2.

(footnote)
(* 1) Polyphenylene ether resin with intrinsic viscosity of 0.47 dl / g (* 2) Polyphenylene ether resin with intrinsic viscosity of 0.38 dl / g (* 3) 6-Nylon resin with deflection temperature under load of 58 ° C Melting point: 220 ° C
(* 4) 6-nylon resin with a deflection temperature under load of 65 ° C Melting point: 225 ° C
(* 5) Asahi Kasei Corporation: Zylon (registered trademark) A1400
(* 6) Asahi Kasei Corporation: Tuftec (registered trademark) M1913
(* 7) Nippon Shokubai Co., Ltd .: Epocross (registered trademark) RPS-1005
(* 8) Daicel Chemical Industries, Ltd .: Epofriend (registered trademark) AT501
(* 9) Hydrogenated SEPS with styrene content of 30wt% and MFR = 2.4g / 10min
(* 10) MC6000 manufactured by Nissan Chemical Industries, Ltd.
(* 11) Polybutylene terephthalate resin Melting point 223 ° C
(* 12) Polybutylene terephthalate resin Melting point 185 ° C
(* 13) Mitsubishi Engineering Plastics Corporation: Remalloy (registered trademark) EX700A
(* 14) Modified polyphenylene ether resin with a deflection temperature under load of 170 ° C. (* 15) Other compounding agents: Irganox 1010 manufactured by Ciba Specialty Chemicals, Adeka Stub CDA-1 manufactured by Asahi Denka Kogyo Co., Ltd. SLIPAX O

Examples 1 to 9 and Reference Examples 1 to 3 are electric wires using a non-halogen flame retardant resin composition having a resin component of a three-component polymer alloy of polyamide resin, polyphenylene ether resin, and styrene elastomer as an insulating coating layer. This is the evaluation result. The evaluation results of the tensile strength, tensile elongation at break, second modulus, high temperature winding test and flame retardancy of the coating layer were all acceptable levels.

Examples 13 , 14 , 15, 17, 18, 19, 20, 21, 26, and 27, and Reference Examples 4 to 8 are three-component polyester resin (polybutylene terephthalate), polyphenylene ether resin, and styrene elastomer. It is the evaluation result of the electric wire which used the non-halogen flame-retardant resin composition which used the polymer alloy as the resin component as an insulation coating layer. As in Examples 1 to 9 , all evaluation results were acceptable levels.

Comparative Examples 1 to 5, 10 and 11 are evaluation results of electric wires using a non-halogen flame retardant resin composition having a resin component of a two-component polymer alloy of a polyphenylene ether resin and a styrene elastomer as a resin component. The tensile strength and tensile elongation at break of the coating layer were the same as those of the examples and were acceptable levels, but cracks were generated in the high temperature winding test and did not reach the acceptable levels. In Comparative Example 11, a crosslinking aid is added, but the effect as in the polyamide resin or the polyester resin is not obtained, and cracks are generated in the high temperature winding test. Further, Comparative Example 3 did not contain a flame retardant and failed the flame retardant test.

  Comparative Examples 6 to 9 use a three-component polymer alloy of polyamide resin, polyphenylene ether resin, and styrene elastomer, but the polyamide resin content is as small as 15 parts by mass with respect to 100 parts by mass of the resin component. The effect of the polyamide resin was small, and cracks were generated in the high temperature winding test, which did not reach the acceptable level.

  In Comparative Example 12, the content of the polyester resin (polybutylene terephthalate) is 15 parts by mass. Similar to the polyamide resin, if the content was small, the effect of improving the high temperature characteristics did not appear, and cracks occurred in the high temperature winding test.

  Comparative Examples 13 and 14 were subjected to irradiation cross-linking, but the effect of improving high-temperature elongation due to irradiation cross-linking was limited, and it was impossible to completely prevent the occurrence of cracks in the high-temperature winding test.

  As a utilization example of the present invention, there is a higher harness for internal wiring of electronic devices such as copying machines and printers.

Claims (7)

The nitrogen-based flame retardant relative to 100 parts by mass of the resin component a non-halogen flame retardant resin composition containing 5 to 70 parts by mass, the resin component 100 parts by weight of a polyamide resin or polyester resin or a mixture thereof 20 to 50 parts by mass, 20 to 50 parts by mass of a polyphenylene ether resin, 30 to 60 parts by mass of a styrene elastomer, and 1 to 10 parts by mass of a styrene elastomer having a functional group as a part of the styrene elastomer. A halogen-free flame retardant resin composition characterized by the above.   The non-halogen flame retardant resin composition according to claim 1, wherein the styrene elastomer is a block copolymer elastomer of styrene and a rubber component.   The non-halogen flame retardant resin composition according to claim 1 or 2, wherein the polyphenylene ether resin is a polyphenylene ether resin obtained by melt blending polystyrene.   The non-halogen flame retardant resin composition according to any one of claims 1 to 3, wherein a deflection temperature under load of the polyphenylene ether resin is 130 ° C or higher. An electric wire / cable comprising the non-halogen flame retardant resin composition according to any one of claims 1 to 4 as a coating layer. The electric wire / cable according to claim 5 , wherein the covering layer has a thickness of 0.3 mm or less. The electric wire / cable according to claim 5 or 6 , wherein the coating layer is crosslinked by irradiation with ionizing radiation.