JP2012059633A - Insulated wire and cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulated wire and the like, which allow even an insulated wire or cable having a thickness of covering of a dielectric layer as large as 0.5 mm or larger to have good flame retardance, heat resistance, mechanical characteristics and flexibility.SOLUTION: An insulated wire 100 includes: a conductor 4; and a dielectric layer 5 covering the conductor 4. The dielectric layer 5 has an inner layer 5a disposed close to the conductor 4, and an outer layer 5b provided to cover the inner layer 5a. The outer layer 5b includes an ester-carbonate copolymer (A1) and a flame retardant. The inner layer 5a includes a dynamically cross-linked material (A2) of a mixture including polyester and acrylic rubber. The weight ratio of the ester -carbonate copolymer (A1) included in the outer layer 5b to the dynamically cross-linked material (A2) included in the inner layer 5a is 1/9 to 1.

Description

  The present invention relates to an insulated wire and a cable.

  A cable that connects electrical devices mounted on an automobile or the like includes at least an insulated wire and a sheath that surrounds the insulated wire, and the insulated wire includes a conductor and an insulating layer that covers the conductor.

  As a composition used for the insulating layer of such a cable, what is disclosed by the following patent document 1, for example is known. In Patent Document 1 below, a thermoplastic vulcanizate composition that can be melt-processed containing a thermoplastic polyester continuous phase and a poly (meth) acrylate or polyethylene / (meth) acrylate rubber dispersed phase, and a flame retardant comprising a phosphinate or the like It has been proposed to obtain a cable excellent in flame retardancy and heat resistance by using a composition containing each at a predetermined ratio.

Special table 2010-509485 gazette

By the way, as a cable used for an automobile, not only a cable having a small conductor cross-sectional area but also a cable having a large conductor cross-sectional area may be required. For example, in a hybrid vehicle (HEV) or an electric vehicle (EV), it is necessary to use a cable having a conductor cross-sectional area of 3 mm ² or more in order to supply a large electric power. May be used as a cable. In such a cable, it is necessary to increase the thickness of the insulating layer in order to ensure insulation. As a result, not only the wiring workability is deteriorated, but also the cable cannot be bent easily due to the thickness of the insulating layer, so that a sufficient space is required in the space for arranging the cable. As a result, miniaturization of the automobile becomes difficult. Therefore, there is an increasing need for cables that can achieve both excellent heat resistance and excellent flexibility. The need for such cables is increasing in particular in automobiles that require a large amount of electric power, such as an electric vehicle, and that require a thick insulation layer. In addition, such a cable is required to have flame retardancy and mechanical characteristics as well as a cable having a small insulating layer coating thickness. Therefore, it is desired that a cable having a large insulating layer covering thickness of 0.5 mm or more can be provided with flame retardancy, mechanical properties, heat resistance and flexibility.

  However, the flame retardant resin composition described in Patent Document 1 has not been able to impart sufficient flexibility to the cable. Therefore, when the insulation layer of the insulated wire which comprises a cable is formed so that it may become 0.5 mm or more using the flame-retardant resin composition of patent document 1, there existed a problem that a wiring operation | work became not easy. In addition, since it is not easy to bend the cable, there is a possibility that the space for arranging the cable may be reduced, and thus the size of the automobile may be hindered.

  The present invention has been made in view of the above circumstances, and has excellent flame resistance, heat resistance, mechanical properties, and flexibility even for an insulated wire or cable having a coating thickness of an insulating layer as large as 0.5 mm or more. It aims at providing the insulated wire and cable which can be provided.

  As a result of intensive studies to solve the above-mentioned problems, the inventor is composed of two layers, an inner layer and an outer layer, and two kinds of polyester elastomers are blended in the inner layer and the outer layer, respectively. The weight ratio between the elastomer and the polyester-based elastomer in the outer layer is set within a predetermined range, and at least the flame retardant is blended in the outer layer to find that the above problems can be solved, and the present invention has been completed. .

  That is, the present invention comprises a conductor and an insulating layer covering the conductor, the insulating layer having an inner layer disposed on the conductor side and an outer layer provided to cover the inner layer, The outer layer contains an ester-carbonate copolymer (A1) and a flame retardant, the inner layer contains a dynamic cross-linked product (A2) of a mixture containing polyester and acrylic rubber, and the dynamic cross-link contained in the inner layer The insulated wire is characterized in that a weight ratio of the ester-carbonate copolymer (A1) contained in the outer layer to the product (A2) is 1 / 9-1.

  According to the insulated wire of the present invention, excellent flame retardancy, heat resistance, mechanical properties and flexibility can be imparted even to an insulated wire or cable having a coating thickness of an insulating layer as large as 0.5 mm or more.

  In the said flame-retardant resin composition, it is preferable that the Shore A hardness of the said dynamic crosslinked material (A2) is less than 90.

  In this case, the flexibility of the insulated wire can be further improved.

  The present invention may also be a cable that includes an insulated wire and a sheath that surrounds the insulated wire, and the insulated wire is composed of the above-described insulated wire.

  According to the present invention, an insulated wire and cable capable of imparting excellent flame retardancy, heat resistance, mechanical properties and flexibility to an insulated wire or cable having a coating thickness of an insulating layer as large as 0.5 mm or more. Is provided.

It is a partial side view which shows one Embodiment of the cable of this invention. It is sectional drawing along the II-II line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.

[cable]
FIG. 1 is a partial side view showing an embodiment of a cable according to the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. As shown in FIGS. 1 and 2, the cable 10 includes an insulated wire 1, a braid 2 that surrounds the insulated wire 1, and a sheath 3 that covers the braid 2. The insulated wire 1 includes an inner conductor 4 and an insulating layer 5 that covers the inner conductor 4.

  Here, the insulating layer 5 has an inner layer 5a disposed on the inner conductor 4 side and an outer layer 5b provided so as to cover the inner layer 5a. The outer layer 5b contains an ester-carbonate copolymer (A1) and a flame retardant, and the inner layer 5a contains a dynamic cross-linked product (A2) of a mixture containing polyester and acrylic rubber. The weight ratio of the ester-carbonate copolymer (A1) contained in the outer layer 5b to the dynamically cross-linked product (A2) contained in the inner layer 5a is 1/9 to 1.

  As described above, since the insulating layer 5 has the above-described configuration, the cable 10 has excellent flame retardancy, heat resistance, and mechanical characteristics even when the coating thickness of the insulating layer 5 is as large as 0.5 mm or more. And it becomes possible to have flexibility.

[Cable manufacturing method]
Next, a method for manufacturing the cable 10 described above will be described.

<Preparation process of inner layer forming material and outer layer forming material>
First, an inner layer forming material for forming the inner layer 5a and an outer layer forming material for forming the outer layer 5b are prepared.

(Inner layer forming material)
The inner layer forming material contains a dynamic cross-linked product (A2) of a mixture containing polyester and acrylic rubber.

(A2) Dynamic cross-linked product of mixture containing polyester and acrylic rubber Polyester is obtained, for example, by reacting at least one dicarboxylic acid (including a dicarboxylic acid derivative such as an ester) with at least one diol. It is a thing.

  Examples of the dicarboxylic acid include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid, sebacic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,2- Examples include aliphatic dicarboxylic acids such as cyclohexanedicarboxylic acid, adipic acid, cyclopentanedicarboxylic acid, and 4,4′-bicyclohexyldicarboxylic acid. These can be used alone or in combination of two or more.

  Examples of the diol include 1,4-butanediol, 1,3-propanediol, ethylene glycol, 1,4-cyclohexanedimethanol and the like.

  Preferred polyesters include poly (ethylene terephthalate) (PET), poly (trimethylene terephthalate) (PTT), poly (1,4-butylene terephthalate) (PBT), poly (ethylene 2,6-naphthoate) and poly (1 , 4-cyclohexyldimethylene terephthalate) (PCT).

  The acrylic rubber is produced using poly (meth) acrylate, a copolymer of plural kinds of (meth) acrylates, or a copolymer of olefin and at least one kind of (meth) acrylate. As the olefin, for example, ethylene, propylene and the like are used. An acrylic rubber can also be obtained by copolymerizing three or more kinds of (meth) acrylates. Here, the acrylic rubber is in an uncrosslinked state.

  A dynamically crosslinked product is obtained by mixing polyester and acrylic rubber, melt-kneading the mixture together with a peroxide free radical initiator and a polyvalent organic olefin auxiliary agent, and dynamically crosslinking the acrylic rubber. Can do. Here, the polyester content in the mixture is preferably 15 to 75 mass%, and the acrylic rubber content is preferably 85 to 25 mass%. Examples of the peroxide free radical initiator include diisopropylbenzene hydroperoxide and cumene hydroperoxide. Examples of the polyvalent organic olefin auxiliary include triallyl isocyanurate (TAIC) and trimethylolpropane trimethacrylate. (TMPTMA) or the like is used.

  Specific examples of the dynamically crosslinked product include NOFALOY (registered trademark) TZ660-6602-BK manufactured by NOF Corporation, NOFALLOY (registered trademark) TZ660-7612-BK manufactured by NOF Corporation, and ETPV 90A01HS manufactured by DuPont. It is done.

  The dynamic cross-linked product is preferably blended in the inner layer forming material at a ratio of 10 to 100% by mass. When the ratio is 10% by mass, flexibility is lowered. In addition, a flame retardant, a flame retardant aid, an antioxidant, an ultraviolet degradation inhibitor, a processing aid, a color pigment, carbon black, a lubricant, and the like can be appropriately added to the dynamically crosslinked product as necessary. . Here, as the flame retardant, the same flame retardant as described later can be used.

  The ratio of the dynamically cross-linked product in the inner layer forming material is preferably 45 to 70% by mass, more preferably 50 to 75% by mass, because the flexibility can be further improved.

  The Shore A hardness of the dynamically crosslinked product is preferably less than 90. In this case, the flexibility of the flame retardant resin composition can be further improved. However, the Shore A hardness is preferably 60 or more from the viewpoint of wear resistance.

(Outer layer forming material)
The outer layer forming material contains an ester-carbonate copolymer and a flame retardant.

  The ester-carbonate copolymer may be a copolymer of ester and carbonate. Examples of the ester include aromatic esters such as ethylene terephthalate, butylene terephthalate, and butylene naphthalate. As the carbonate, those using an aliphatic diol having 2 to 12 carbon atoms as a raw material diol are preferable. Examples of such an aliphatic diol include ethylene glycol, 1,3-propylene glycol, and 1,4-butanediol. 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 2,2-dimethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,4- Examples include diethyl-1,5-pentanediol, 1,9-nonanediol, and 2-methyl-1,8-octanediol.

  Preferable ester-carbonate copolymers include ester-carbonate block copolymers in which PBT is used as the polyester, and the polycarbonate is one in which the starting diol is an aliphatic diol having 5 to 12 carbon atoms.

  The ester-carbonate copolymer may be a random copolymer or a block copolymer, but a block copolymer is preferred because the heat resistance can be further improved.

(Flame retardants)
The flame retardant is not particularly limited as long as it has flame retardancy. Examples of the flame retardant include metal hydrates, phosphorus flame retardants, and nitrogen flame retardants.

  Examples of the metal hydrate include magnesium hydroxide and aluminum hydroxide.

As the phosphorus flame retardant, for example, a metal phosphate or a condensed phosphate is used. Specifically, various phosphinate metal salts (such as Al salt and Zn salt), resorcinol bis-diphenyl phosphate, resorcinol bis-dixylenyl phosphate, bisphenol A bis-diphenyl phosphate, and the like are used. These can be used alone or in combination of two or more. As the phosphorus-based flame retardant, those which are liquid at the time of melt kneading are preferable. Here, examples of the phosphorus-based flame retardant that is liquid during melt-kneading include bisphenol A bis-diphenyl phosphate. The phosphorus-based flame retardant that is liquid at the time of melt-kneading is easily dispersed in the ester-carbonate copolymer, and the phosphorus-based flame retardant can be uniformly dispersed in the insulating layer 5. As a result, the flame retardancy of the cable 10 can be further improved. The phosphorus-based flame retardant may be a liquid at room temperature (25 ° C.) as long as it is liquid when melt-kneaded.
For example, melamine cyanurate is used as the nitrogen-based flame retardant.

  It is preferable that a flame retardant is mix | blended in the ratio of 5-40 mass parts with respect to 100 mass parts of ester-carbonate copolymers. When the ratio of the flame retardant is in the above range, there is an advantage that the mechanical properties are excellent as compared with the case where the flame retardant is out of the above range. The flame retardant is more preferably blended at a ratio of 5 to 30 parts by mass, more preferably 5 to 25 parts by mass with respect to 100 parts by mass of the ester-carbonate copolymer.

  The outer layer forming material may be a flame retardant aid, hydrolysis inhibitor, acid acceptor, antioxidant, UV degradation inhibitor, processing aid, color pigment, lubricant, carbon black, crosslinking aid, etc. The filler may be further included.

  The inner layer forming material and the outer layer forming material can be kneaded in a kneader such as a Banbury mixer, tumbler, pressure kneader, kneading extruder, twin screw extruder, mixing roll, or the like.

<Internal conductor preparation process>
On the other hand, the inner conductor 4 is prepared. The inner conductor 4 may be composed of only one strand, or may be configured by bundling a plurality of strands. Further, the inner conductor 4 is not particularly limited with respect to the conductor diameter, the material of the conductor, and the like, and can be appropriately determined according to the application.

<Insulating layer formation process>
Next, an insulating layer 5 is formed so as to cover the inner conductor 4. Specifically, the inner layer forming material is first melt-kneaded using an extruder, and continuously coated on the inner conductor 4 while forming a tubular extrudate. Thus, the inner conductor 4 is covered with the inner layer 5a.

  Subsequently, the outer layer forming material is melt-kneaded using an extruder, and continuously coated on the inner layer 5a while forming a tubular extrudate. Thus, the inner layer 5a is covered with the outer layer 5b. At this time, the inner layer forming material and the outer layer forming material are adjusted so that the weight ratio of the ester-carbonate copolymer in the outer layer 5b to the dynamically cross-linked product (A2) in the inner layer 5a is 1/9 to 1. Adjust the weight ratio. Here, when the weight ratio is less than 1/9, flexibility, flame retardancy, and mechanical properties are deteriorated. On the other hand, when the weight ratio exceeds 1, flexibility decreases.

  The weight ratio is preferably 1/9 to 1/2, more preferably 1/9 to 1/3, from the balance between wear resistance and flexibility.

  Thus, the insulating layer 5 covering the inner conductor 4 is formed, and the insulated wire 1 is obtained. Here, the reason why the inner layer forming material is blended with the inner layer 5a and the outer layer forming material is used for the outer layer 5b is as follows. That is, if the positions of the inner layer 5a and the outer layer 5b are reversed, the wear resistance is extremely lowered.

  The inner layer 5a and the outer layer 5b may be formed at the same time by simultaneously extruding the inner layer forming material and the outer layer forming material.

<Braiding process>
Next, the insulated wire 1 is surrounded by the braid 2. The braid 2 functions as an outer conductor and is made of a metal such as an annealed copper wire.

<Sheath coating process>
Finally, the sheath 3 is formed so as to cover the braid 2. The sheath 3 protects the insulating layer 5 from physical or chemical damage. As the sheath 3, for example, an insulating resin containing an ester-carbonate copolymer and a flame retardant is used. The cable 10 is obtained as described above.

  According to the manufacturing method of the cable 10 described above, the obtained cable 10 has excellent flame resistance, heat resistance, mechanical properties and flexibility even when the insulating layer 5 has a coating thickness of 0.5 mm or more. it can.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the cable 10 has a coaxial structure, but it can also be applied to a cable such as a flat cable. When used for a flat cable or the like, the braid 2 can be omitted. Further, two or more insulated wires 1 may be provided inside the sheath 3 depending on the application. Moreover, in the said embodiment, although the insulated wire 1 is used as a part of cable 10, the insulated wire 1 is not possible as a part of the cable 10, and can also be used independently.

  Moreover, in the said embodiment, although only the insulating layer 5 of the insulated wire 1 is comprised by two layers, the inner layer 5a and the outer layer 5b, the sheath 3 is also comprised by the inner layer 5a and the outer layer 5b similarly to the insulating layer 5. May be. Alternatively, the insulating layer 5 may be composed of a single layer made of a normal insulating resin, and only the sheath 3 may be composed of two layers, the inner layer 5a and the outer layer 5b.

  Hereinafter, the content of the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples.

(Examples 1-7 and Comparative Examples 1-5)
First, an inner layer forming material comprising (A2) TPE-E2, (A2) TPE-E3 or (A2) TPE-E4 was prepared in the amounts shown in Tables 1 and 2. Also, (A1) TPE-E1 (ester-carbonate copolymer) and (B) flame retardant are prepared, and these are melt-kneaded at 240 ° C. with a Banbury mixer at the blending ratios shown in Tables 1 and 2, for outer layer formation. Materials were prepared. In Tables 1 and 2, the unit of the amount of each compounding component is part by mass unless otherwise specified.

Specific examples of the (A2) TPE-E2, (A2) TPE-E3, (A2) TPE-E4, (A1) TPE-E1 (ester-carbonate copolymer) and (B) flame retardant are as follows. A thing was used.
(1) Material component for inner layer formation (A2) TPE-E2 (dynamic cross-linked product of a mixture containing polyester and acrylic rubber)
NOFALOY (registered trademark) TZ660-6602-BK manufactured by NOF Corporation (Shore A hardness = 76)
(A2) TPE-E3 (dynamic cross-linked product of a mixture containing polyester and acrylic rubber)
NOFALOY (registered trademark) TZ660-7612-BK manufactured by NOF Corporation (Shore A hardness = 76)
(A2) TPE-E4 (dynamic cross-linked product of a mixture containing polyester and acrylic rubber)
ETPV 90A01HS manufactured by DuPont (Shore A hardness = 90)
(2) Material component for outer layer formation (A1) TPE-E1 (ester-carbonate copolymer)
Peroprene (registered trademark) C2000 manufactured by Toyobo Co., Ltd.
(B) Melamine cyanurate MC-6000 manufactured by Nissan Chemical Industries, Ltd.

Next, the inner layer forming material and the outer layer forming material are transferred to an inner layer extruder (L / D = 20, screw shape: full flight screw) and an outer layer extruder (L / D = 20, screw shape: full flight screw). Each of the layers was put in and the two layers of the inner layer and the outer layer were simultaneously extruded, and the insulating layer was coated on the conductor (58 / 0.28A) so that the inner layer had a thickness of 0.5 mm and the outer layer had a thickness of 0.2 mm. Thus, an insulated wire having an outer diameter of 3.7 mm was obtained. At this time, the input amount of the outer layer forming material into the extruder is such that the weight ratio of the component (A1) contained in the outer layer forming material to the component (A2) contained in the inner layer forming material is as shown in Table 1. And 2 were adjusted so as to be “weight ratio (A1) / (A2)”. In Table 1, “weight ratio (A1) / (A2)” of Examples 4 to 6 are all “0.11”, but these are all expressed by “1/9” in decimal point. It is a thing.

  The following characteristics were evaluated about the insulated wires of Examples 1-7 and Comparative Examples 1-5 obtained as described above.

[Characteristic evaluation]
(1) Flame retardancy For the insulated wires of Examples 1 to 7 and Comparative Examples 1 to 5, an ISO 6722 45-degree inclined combustion test was performed, and based on the test results, the flame retardancy was evaluated as follows. . That is, the fire was extinguished within 70 seconds, and the insulated wire in which the upper 50 mm in 500 mm remained was accepted, and the insulated wire that was not so was rejected. The results are shown in Tables 1 and 2. In Tables 1 and 2, an insulated wire that passed was indicated as “◯”, and an insulated wire that failed was indicated as “x”.

(2) Mechanical properties The mechanical properties were evaluated as follows based on the measured tensile breaking strength of the insulated wires of Examples 1 to 7 and Comparative Examples 1 to 5 which were subjected to a tensile test according to JIS standard C3005. did. That is, a material having a tensile strength at break of 8 MPa or higher was accepted as being excellent in mechanical properties, and a material having a tensile strength less than 8 MPa was rejected. Tables 1 and 2 show the results of the tensile strength at break. The tensile test was performed at a tensile speed of 200 mm / min and a distance between marked lines of 20 mm.

(3) Flexibility Flexibility was evaluated for Examples 1 to 7 and Comparative Examples 1 to 5 according to JIS standard C3005 based on the measured 100% modulus results as follows. That is, a 100% modulus of 10 MPa or less was accepted as being excellent in flexibility, and a sample exceeding 10 MPa was rejected. The results for 100% modulus are shown in Tables 1 and 2. The tensile test was performed at a tensile speed of 200 mm / min and a distance between marked lines of 20 mm. In Tables 1 and 2, “−” is displayed for those that do not stretch 100% because the 100% modulus cannot be measured.

(4) Heat resistance The heat resistance was evaluated based on the results of both heat deformation resistance and heat aging resistance.
(A) Heat-resistant heat deformation property The heat-resistant deformation property of an insulated wire was evaluated as follows based on ISO6722. That is, an insulated wire was put in an oven at 150 ° C. and left for 4 hours, and the edge of a metal blade having a thickness of 0.7 mm was pressed with a load of 4.7 N for 4 hours. And after winding an insulated wire around a 6 mmφ mandrel, a voltage of 1 kV was applied to the portion where the edge was pressed for 1 minute to conduct a withstand voltage test. Then, it was visually observed whether or not insulation breakdown occurred in the insulated wire. The results are shown in Tables 1 and 2. In Tables 1 and 2, an insulated wire that does not cause dielectric breakdown is indicated by “◯” as being excellent in heat distortion resistance, and an insulated wire that is caused by dielectric breakdown is indicated by “X”.
(B) Heat aging resistance The heat aging resistance of an insulated wire was evaluated as follows based on ISO6722. That is, an insulated wire was put in an oven at 150 ° C. and left for 3000 hours. And after winding an insulated wire around a 6 mm diameter mandrel, a withstand voltage test was performed by applying a voltage of 1 kV for 1 minute. Then, it was visually observed whether or not insulation breakdown occurred in the insulated wire. The results are shown in Tables 1-3. In Tables 1 and 2, an insulated wire that does not cause dielectric breakdown is indicated by “◯” as being excellent in heat aging resistance, and an insulated wire that is caused by dielectric breakdown is indicated by “x”.
In Tables 1 and 2, if both heat distortion resistance and heat aging resistance are acceptable, the heat resistance is excellent, and either heat distortion resistance or heat aging resistance is not acceptable. It was rejected as inferior.

  In addition to the above properties, the following tensile elongation at break, wear resistance, and low temperature resistance were evaluated as follows.

(5) Tensile Breaking Elongation The tensile breaking elongation was measured by conducting a tensile test according to JIS standard C3005 for the insulated wires of Examples 1 to 7 and Comparative Examples 1 to 5. That is, those with a tensile elongation at break of 150% or more were accepted and those with a tensile break elongation of less than 150% were rejected. The tensile test was performed at a tensile speed of 200 mm / min and a distance between marked lines of 20 mm. The results are shown in Tables 1 and 2.

(6) Abrasion resistance The abrasion resistance of the insulated wires of Examples 1 to 7 and Comparative Examples 1 to 5 was evaluated based on the following procedure based on a scrape test (ISO 6722).
That is, while a needle having a diameter of 0.45 mm was pressed against the surface of the insulated wire with a load of 7 N, the surface of the insulated wire was subjected to reciprocating wear. At that time, the number of reciprocations until the needle contacted the conductor in the insulated wire was measured. And after moving an insulated wire with respect to a needle, it rotated 90 degrees centering on the longitudinal direction, and the number of reciprocations was measured similarly to the above also in the location which opposes a needle. This operation was repeated 12 times, and the average value was obtained. And the insulated wire whose average value of the measured number of reciprocations was 3000 times or more was good, and the insulated wire which was less than 3000 times was judged as bad.
The measurement was terminated when the number of reciprocations exceeded 3000. The results are shown in Tables 1 and 2. In Tables 1 and 2, good insulated wires are indicated as “◯”, and defective insulated wires are indicated as “x”.

  From the results shown in Tables 1 and 2, the insulated wires of Examples 1 to 7 have excellent flame resistance, heat resistance, mechanical properties, and flexibility even when the insulation layer has a coating thickness of 0.5 mm or more. It turns out that it can be granted. On the other hand, the insulated wires of Comparative Examples 1 to 5 do not reach the acceptance standard in at least one of flame retardancy, heat resistance, mechanical properties, and flexibility, and have excellent flame retardancy, heat resistance, mechanical It was found that the physical characteristics and flexibility could not be satisfied at the same time.

  From this, according to the flame retardant resin composition of the present invention, excellent insulation properties, heat resistance, mechanical properties and flexibility can be obtained even for an insulated wire having a coating thickness of the insulating layer as large as 0.5 mm or more. It was confirmed that it could be granted.

DESCRIPTION OF SYMBOLS 1 ... Insulated electric wire 2 ... Braiding 3 ... Sheath 4 ... Internal conductor 5 ... Insulating layer 5a ... Inner layer 5b ... Outer layer 10 ... Cable.

Claims (3)

Conductors,
An insulating layer covering the conductor,
The insulating layer has an inner layer disposed on the conductor side and an outer layer provided so as to cover the inner layer,
The outer layer includes an ester-carbonate copolymer (A1) and a flame retardant,
The inner layer includes a dynamic cross-linked product (A2) of a mixture containing polyester and acrylic rubber,
The insulated wire in which the weight ratio of the ester-carbonate copolymer (A1) contained in the outer layer to the dynamically cross-linked product (A2) contained in the inner layer is 1 / 9-1.   The insulated wire according to claim 1, wherein the Shore A hardness of the dynamically cross-linked product (A2) is less than 90. Insulated wires,
A sheath surrounding the insulated wire,
The said insulated wire is comprised with the insulated wire of Claim 1 or 2, The cable characterized by the above-mentioned.

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