JPH1153946A - Cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain airtightness and watertightness of an interface between a cable and a molded body over a long period of time by forming the outermost layer of a coating layer of a multiconductor stranded wire, of a cross-linked body of a resin composition containing, as resin constituents, a specific ratio of a thermoplastic polyester elastomer and a specific ethylene coplymer. SOLUTION: A multiconductor stranded wire 1 is formed by stranding a plurality of insulated conductors consisting of by providing an insulation layer 1b composed of a polyethylene resin composition, a polyvinylchloride resin composition, etc., on each of conductors 1a. A coating layer 2 for coating the multiconductor stranded wire 1 comprises a layer made up by cross-linking appropriately a resin composition containing, as resin constituents, 30 to 70 wt.% of a thermoplastic polyester elastomer and 30 to 70 wt.% of an ethylene copolymer having glycidylmethacrylate. Adhesive property of a cable-coating materiel to a molded material is very high at a cable end part and the cable is resistant to high temperature and high pressure in resin molding, as well as heating and cooling at the time of use, due to being coated with a cross- linked body of a specific resin composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable used for automobiles, robots, electronic equipment, and the like. After being connected to the like, it is suitable to be molded with a thermoplastic resin such as a polybutylene terephthalate (hereinafter also referred to as PBT) resin or a polyamide (hereinafter also referred to as PA) resin in order to keep the connection portion airtight or watertight. It is about a simple cable.

[0002]

2. Description of the Related Art A thermoplastic polyurethane resin composition having good mechanical properties and flexibility is used as an insulating coating material for cables used for automobiles, robots, electronic devices and the like. After molding, the thermoplastic polyurethane resin composition is often improved in heat resistance, chemical resistance and water resistance by crosslinking treatment by irradiation with ionizing radiation. When connecting a component such as a sensor or an electrode terminal to such a cable, the connection portion and the periphery thereof are molded airtight or watertight with a resin mold (molded body) and protected. In order to secure airtightness and watertightness with a resin mold as described above, PBT resin and PA resin are often used as a molding material because of ease of molding and excellent mechanical strength.

[0003]

However, depending on the selection of the covering material and the molding material of the cable, the difference in the thermal shrinkage between the materials may cause the cable and the molded body to be heated and cooled during the terminal processing and the use. A gap is created at the interface,
There is a problem that moisture infiltrates from a gap generated at the interface. If moisture enters through the gaps created at the interface, the conductors of the cable will corrode and the performance of the connected equipment parts will deteriorate, and other problems will occur.Therefore, various sealing measures must be taken to maintain airtightness and watertightness. Required. For this reason, the workability at the time of terminal processing becomes extremely complicated, and the work required a high degree of skill.

In order to solve such a problem, it is conceivable that the covering material of the cable is made of the same or similar material as the molding material in consideration of adhesiveness with the molding material. The coating material has poor moldability and has a problem in the flexibility required for electric wires. In addition, even if the coating material has satisfactory initial adhesion to the molding material, air-tightness and water-tightness are impaired in the heat shock test, and materials that exhibit characteristic deterioration in the water resistance test are practical in the long term. Not a target. An object of the present invention is to maintain air-tightness and water-tightness of an interface between a cable and a molded body for a long period of time without taking special sealing measures to maintain air-tightness and water-tightness, and to provide a conductor for a cable. An object of the present invention is to provide a cable which can prevent corrosion and performance degradation of connected equipment parts and has excellent water resistance.

[0005]

In order to achieve the above object, the present invention provides (1) a cable in which a coating layer is provided outside a multi-core stranded wire obtained by twisting a plurality of insulated conductors. At least the outermost layer of the layer is formed of a crosslinked resin composition containing, as a resin component, 30 to 70% by weight of a thermoplastic polyester elastomer and 30 to 70% by weight of an ethylene copolymer having glycidyl methacrylate. (2) The cable according to (1), wherein the resin composition contains a thermoplastic polyurethane as a resin component other than a thermoplastic polyester elastomer and an ethylene copolymer having glycidyl methacrylate. (3) The resin composition contains 0.5 to 5 parts by weight of fine particle silica based on 100 parts by weight of the total amount of the resin component. The cable according to (1) or (2), wherein the coating layer comprises two layers, and the inner layer is selected from the group consisting of a thermoplastic polyester elastomer and a thermoplastic polyurethane. The cable according to any one of (1) to (3), wherein a resin composition comprising at least one kind of base resin is used, (5) the covering layer is composed of two layers, and the inner layer has a density of Is a resin composition containing at least one selected from the group consisting of an ethylene / α-olefin copolymer and an ethylene / vinyl acetate copolymer having a base resin of 0.86 to 0.90 g / cm ^3. A cable according to any one of (1) to (3) is provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the cable of the present invention, one or more coating layers may be provided on a multifilamentary stranded wire obtained by twisting insulated conductors. When a plurality of layers are formed, they may be coated by simultaneous extrusion, or the next outer layer may be sequentially coated after the inner layer is coated. At this time, at least the outermost layer of the coating layer is formed of a resin composition containing, as a resin component, 30 to 70% by weight of a thermoplastic polyester elastomer and 30 to 70% by weight of an ethylene-based copolymer having glycidyl methacrylate.

An embodiment of the present invention will be described below. FIG. 1 is a schematic sectional view showing an embodiment of a cable according to the present invention, wherein 1 is a multi-core stranded wire, and the multi-core stranded wire 1 is a conductor (for example, 20 tinned soft copper wires having an outer diameter of 0.18 mmφ are stranded). A plurality of insulated conductors (2 in FIG. 1) provided with an insulating layer 1b made of a polyethylene resin composition, a polyvinyl chloride resin composition, etc. on a stranded wire conductor 1a having a conductor diameter of 1 mmφ.
Book). 2 is multi-core stranded wire 1
The coating layer 2 is composed of a layer obtained by appropriately cross-linking a resin composition containing the thermoplastic polyester elastomer and an ethylene copolymer having glycidyl methacrylate as a resin component.

The coating layer provided on the outside of the multi-core stranded wire is a cable
In order to increase the roundness of the cross section of the
FIG. 2 shows an embodiment of the present invention.
The covering layer 2 covering the stranded wire 1 is composed of a plurality of layers (two layers in FIG. 2).
The inner layer 2a is made of a thermoplastic polyester elastomer,
At least one selected from the group of thermoplastic polyurethanes
Or a resin composition having a density of 0.8
6-0.90 g / cm ^ThreeEthylene and α-olefin
From the group of copolymers and ethylene / vinyl acetate copolymers
Resin composition using at least one selected base resin
Can be formed. This inner layer is a moderately crosslinked layer
It may be. The outer layer 2b of the coating layer is made of the above-mentioned thermoplastic poly.
Ester elastomer and glycidyl methacrylate
Containing an ethylene copolymer having a resin as a resin component
It is composed of a layer in which the resin composition is appropriately crosslinked. Departure
In the case of the Ming cable, the coating provided on the multi-core stranded wire
The outermost layer of the layer is formed by a crosslinked product of a specific resin composition.
Cable coating at the cable end
The adhesion between the material and the molding material (molded body) is extremely high,
When receiving high temperature and high pressure during resin molding of the cable end
Or repeated heating and cooling during use
Airtightness at the interface between the cable and the molding material (molded body)
The problem of poor watertightness is solved.

The resin composition constituting at least the outermost layer of the coating layer of the cable of the present invention contains, as a resin component, an ethylene copolymer having a thermoplastic polyester elastomer and glycidyl methacrylate. The thermoplastic polyester elastomer used in the present invention is a block copolymer of a hard segment composed of an aromatic polyester such as polybutylene terephthalate and polybutylene isophthalate and a soft segment composed of an aliphatic polyether such as polytetramethylene ether glycol. It is united. Such things include, for example,
“Hytrel” (trade name, manufactured by Toray Dupont), “Perprene” (trade name, manufactured by Toyobo Co., Ltd.) and the like are commercially available, and can be appropriately selected from various grades of commercially available products and used. Examples of the ethylene-based copolymer having glycidyl methacrylate used in the present invention include, for example, ethylene-glycidyl methacrylate-copolymer, ethylene-glycidyl methacrylate-vinyl acetate terpolymer, ethylene-glycidyl methacrylate-methyl acrylate ternary Copolymers and the like may be mentioned, and these may be used as a mixture of two or more kinds. As such a product, for example, “Bond First” (trade name, manufactured by Sumitomo Chemical Co., Ltd.) and the like are commercially available. It can be appropriately selected and used from various grades.

The amount of the thermoplastic polyester elastomer and the ethylene copolymer having glycidyl methacrylate, which are resin components, in the resin composition constituting at least the outermost layer of the coating layer of the cable of the present invention will be described. The compounding amount of the thermoplastic polyester elastomer is in the range of 30 to 70% by weight, preferably 40 to 60% by weight. When the amount of the thermoplastic polyelastomer is within this range, the adhesiveness between the cable outermost layer and the molding material is good, and watertightness and airtightness can be secured. The amount of the ethylene-based copolymer having glycidyl methacrylate is in the range of 30 to 70% by weight, preferably 40 to 60% by weight. When the compounding amount of the ethylene copolymer having glycidyl methacrylate is within this range, the adhesiveness between the outermost layer of the cable and the molding material is good, and not only water tightness and air tightness can be ensured, but also water resistance and water resistance. The abrasion becomes good.

The resin composition may contain a thermoplastic polyurethane as long as the properties of the thermoplastic polyester elastomer and the ethylene copolymer having glycidyl methacrylate are not impaired. Thermoplastic polyurethane can improve the mechanical properties of the resin composition. Examples of the thermoplastic polyurethane include polyester-based urethanes (adipate-based, caprolactone-based, and polycarbonate-based) and polyether-based urethanes. Polyether-based urethanes are preferable in terms of water resistance, mold resistance, and the like.

Further, by blending fine particle silica as an additive, the abrasion resistance of the resin composition can be improved. Regarding the particulate silica, any of a dry method and a wet method can be used regardless of the production method. Examples of such products include “Aerosil” (trade name, manufactured by Nippon Aerosil Co., Ltd.) and “Toksil” (trade name,
Tokuyama Soda Co., Ltd.) is commercially available. The compounding amount of the fine particle silica is 0.5 with respect to 100 parts by weight of the total amount of the resin component.
If the amount exceeds 5 parts by weight, the cold resistance of the cable is reduced.

The coating layer provided on the outside of the multifilamentary stranded wire is preferably a multilayer of two or more layers in order to increase the roundness of the cable cross section. Of the multilayer coating layer, the coating material of the inner layer is:
It is selected in consideration of the adhesion to the outermost coating layer, etc.
In particular, a resin composition containing any one of a thermoplastic polyester elastomer and a thermoplastic polyurethane or a mixture thereof as a base resin, or having a density of 0.86 to 0.90 g /
A resin composition having a base resin of any one of ethylene / α-olefin copolymer and ethylene / vinyl acetate copolymer having a cm ³ or a mixture thereof is preferable.

When a resin composition containing a thermoplastic polyester elastomer, a thermoplastic polyurethane or a mixture thereof as a base resin is used as the inner layer coating material, the airtightness between the inner layer and the outer layer and the repeated bending characteristics are maintained. In addition, stripping of the sheath at the time of processing the cable is facilitated.

The coating material for the inner layer has a density of 0.8
A resin composition having a base resin of at least one selected from the group consisting of an ethylene / α-olefin copolymer and an ethylene / vinyl acetate copolymer having a weight of 6 to 0.90 g / cm ³ was used as the inner layer coating material. In this case, it is possible to form the cable at low cost while maintaining the airtightness between the inner layer and the outer layer and the repeated bending characteristics.

The ethylene / α-olefin copolymer includes ethylene and propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene,
It is a copolymer with at least one kind of α-olefin such as dodecene, and in the present invention, preferably has a density of 0.86 to 0.90 g / cm ³ from the viewpoint of crosslinking property and elasticity. The vinyl acetate copolymer preferably has a vinyl acetate content of 10 to 30% by weight from the viewpoint of crosslinkability and elasticity. The ethylene / α-olefin copolymer and the ethylene / vinyl acetate copolymer can be used alone or as a mixture of both.

The heat resistance of the resin composition constituting the inner layer can be improved by cross-linking. When the resin composition is molded with a resin having a high melting point such as polybutylene terephthalate or polyamide, it is preferable to cross-link. Heat resistance and rubber elasticity can be improved by crosslinking the coating layer,
As a result, the elastic repulsive force of the cable insulating layer, that is, the restoring force is improved, so that the air-tightness and the water-tightness of the interface with the molded body molded into the terminal are improved. The resin composition used for the outermost layer of the coating layer can be further improved in heat resistance, chemical resistance, and water resistance by being appropriately cross-linked, but adhered at a gel fraction of 5 to 50%. The greatest improvement in heat resistance and heat resistance is observed. If it is less than 5%, the effect of crosslinking such as melting of the cable coating layer in a high temperature atmosphere of 200 ° C. or higher is not recognized. If it exceeds 50%, the adhesiveness, which is the object of the present invention, decreases, resulting in impaired airtightness and watertightness.

As a method for crosslinking the coating layer, a conventionally known crosslinking method using ionizing radiation or a chemical crosslinking method can be adopted, but from the viewpoint of productivity, a crosslinking method using irradiation with ionizing radiation such as an electron beam is preferable. . The dose of the electron beam is 1 to 30
Mrad is appropriate. In the case of the chemical crosslinking method,
Using a resin composition containing an organic peroxide as a crosslinking agent, crosslinking is completed by heat treatment after extrusion molding.

The resin composition constituting the coating layer of the cable according to the present invention contains various additives generally used in insulated wires and cables, such as antioxidants, metal deactivators, and flame retardants. , Dispersants, colorants, fillers,
A lubricant and the like can be appropriately compounded within a range that does not impair the purpose of the present invention. In particular, the addition of a flame retardant is indispensable for automotive applications.

Examples of the antioxidant include amines such as 4,4'-dioctyl diphenylamine, N, N'-diphenyl-p-phenylenediamine, and a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline. -Based antioxidant, pentaerythrityl-tetrakis (3- (3,5-di-t-
Butyl-4-hydroxyphenyl) propionate),
Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4)
Phenolic antioxidants such as -hydroxybenzyl) benzene, bis (2-methyl-4- (3-n-alkylthiopropionyloxy) -5-t-butylphenyl) sulfide, 2-mercaptobenzimidazole and zinc salts thereof And sulfur-based antioxidants such as pentaerythritol-tetrakis (3-lauryl-thiopropionate).

Examples of the metal deactivator include N, N'-bis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl) hydrazine, 3- (N-salicyloyl) amino-1, 2,4-triazole, 2,2′-oxamidobis- (ethyl 3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate) and the like.

As the flame retardant, tetrabromobisphenol A (TBA), decabromodiphenyl oxide (DBDPO), octabromodiphenyl ether (O
BDPE), hexabromocyclododecane (HBC
D), bistribromophenoxyethane (BTBP)
E), halogen-based flame retardants such as tribromophenol (TBP), ethylenebistetrabromophthalimide, TBA / polycarbonate oligomer, brominated polystyrene, brominated epoxy, ethylenebispentabromodiphenyl, chlorinated paraffin, dodecachlorocyclooctane, etc. And inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide, and phosphorus-based flame retardants such as phosphoric acid compounds, polyphosphoric acid compounds and red phosphorus compounds.

Examples of the flame retardant aid and filler include carbon, clay, zinc oxide, tin oxide, magnesium oxide, molybdenum oxide, antimony trioxide, silica, talc, calcium carbonate, magnesium carbonate, zinc borate and the like.

[0024]

Next, the present invention will be described in more detail with reference to examples. (Examples 1 to 8, Comparative Examples 1 and 2) Conductor (conductor diameter 1 mmφ)
(Tin-plated soft copper stranded wire composition: 20 wires / 0.18mmφ)
Is extruded with a low-density polyethylene to an outer diameter of 1.7 mm, and irradiated with an electron beam having an acceleration voltage of 500 keV and a dose of 20 Mrad to obtain an insulated conductor having a cross-linked polyethylene insulating layer. A multi-core stranded wire in which two conductors were stranded was prepared. Then, on the multi-core stranded wire,
Using a 40 mmφ extruder (L / D = 25), a die temperature of 180 ° C., and then to the feeder side, C3 = 170 ° C., C2
= 160 ° C. and C1 = 150 ° C., the inner layer resin composition was extrusion-coated to have an outer diameter of 4.2 mmφ to form an inner layer, and the outer layer resin composition was further coated thereon with an outer diameter of 5 mm. Extrusion coating was carried out under the same conditions as for the inner layer so that the inner diameter became 0.0 mmφ. Next, after extrusion coating, the coating layer was cross-linked by irradiating an electron beam with an acceleration voltage of 750 keV and the irradiation dose shown in the table, to obtain a cable having two coating layers as shown in FIG. In addition, about Examples 1-5 and Comparative Examples 1 and 2,
The inner coating layer and the outer coating layer were formed of the same material.

Various characteristics of the obtained cables were evaluated by the following test methods, and the results are also shown in Tables 1 and 2. 1) Gel fraction of the outer layer Only the outer layer was collected from the cable, and it was heated at 110 ° C with xylene.
Extract for 24 hours, dry thoroughly and weigh. The weight remaining after melting was defined as a gel content and expressed as a percentage of the weight before solvent extraction.

2) Peel strength between PBT resin or PA resin and coating layer and presence or absence of residue after peeling a) A coating layer of a cable having a predetermined length is divided into two in the longitudinal direction,
The insulated conductor is removed, b) the divided semicircular coating layer is set in a mold, and c) PBT resin or P
A resin (nylon 12) was injected to perform resin molding on the coating layer. The obtained resin molded body was subjected to a peel test. In the peeling test, the cable coating layer was formed at an angle of 90 degrees from the resin molded body at 50 mm / min. And the maximum strength at that time was measured, and at the same time, it was observed whether or not the cable coating material remained on the surface of the resin molded body on the peeled surface. When the coating material was destroyed by cohesive force and remained on the surface of the molded product, the result was evaluated as “O”.

3) Airtightness of Terminal As shown in FIG. 3, the covering layers 2 and 1b of the cable were removed to expose the conductor 1a, and the electrode terminal 5 was connected to the end. Next, the connection portion and the vicinity thereof were covered with a resin molded body 4 by molding (injection molding) using PBT resin. About this cable, 120 degreeC x 1 hour, -40
C. × 1 hour as one cycle, 100 cycles, 50 cycles
Perform a 0 cycle heat shock test, then
Compressed air of 2 atm was injected from the terminal opposite to the resin molded body side, immersed in water to check for leakage from the resin molded body side, and airtightness was confirmed by the presence or absence of bubbles. The test was carried out on 5 samples, and when all passed, it was evaluated as ○, and when any of the samples failed, it was evaluated as x.

4) Water resistance The outer layer was halved from the cable sample and collected.
I punched it with an 8-inch dumbbell. The punched sample is polished to a smooth surface, and then immersed in hot water at 90 ° C.
It was immersed for 40 hours. The immersed sample was measured with a constant speed type tensile tester between the marked lines at a distance of 20 mm and a pulling speed of 500 mm / min.
And tensile strength at break (TS) and elongation at break (El) were measured. This result was compared with T before hot water immersion.
It was expressed as a percentage of S and El.

5) Airtightness after water resistance test The sample before heat shock test prepared in 3) above was immersed in hot water under the same conditions as 4) above, and then subjected to the same airtightness test as 3). . The number of tests was 3, and was evaluated as ○ when all the samples passed, and × when at least one of them failed.

6) Heat resistance A metal rod having the same diameter (5.0 mmφ) as the cable sample
It was left at 200 ° C. for 30 minutes while being wound for more than one turn.
After being taken out and sufficiently cooled at room temperature, it was visually confirmed that there was no crack or melting on the cable surface. Perform a three-sample test, and if all samples have no melting or cracks,
When at least one of them had melted or cracked, it was evaluated as x.

7) Abrasion resistance Using an apparatus having a configuration as shown in FIG.
The outer diameter of the cable after applying a load of 0 gf and moving the abrasion tape by 3 m was measured. The case where the decrease in the outer diameter was 0.4 mm or less was evaluated as ○, and the case where the decrease in the outer diameter was 0.4 mm or more was evaluated as x.

The components shown in Tables 1 and 2 were as follows. Outer layer resin composition (01) TPEE (thermoplastic polyester elastomer) manufactured by Toray Dupont Co., Ltd., trade name: Hytrel 2300X
06 (02) E-GMA (ethylene / glycidyl methacrylate copolymer) Sumitomo Chemical Co., Ltd., trade name: Bond First E (03) TPU (thermoplastic polyurethane) Nippon Milactran Co., Ltd., trade name: E- 385 PNA
T (04) pentaerythrityl-tetrakis (3- (3,3
5-Di-t-butyl-4-hydroxyphenyl) propionate) Ciba Geigy Co., Ltd., trade name: Irganox 101
0 (05) Ethylene bispentabromodiphenyl Albemarle Co., Ltd., trade name: Cytex 8010 (06) antimony trioxide, tin mine mining bureau, trade name: Shensei (07) fine particle silica, manufactured by Nippon Aerosil Co., Ltd. Product Name: Aerosil 200

Inner layer resin A thermoplastic polyurethane manufactured by Nippon Miractran Co., Ltd., trade name: E-385PNA
TB ethylene / vinyl acetate copolymer Mitsui / Dupont Polychemical Co., Ltd., trade name: Evaflex V527-4C ethylene / α-olefin copolymer Dow Chemical Co., Ltd., trade name: Engage CL8
003

[0034]

[Table 1]

[0035]

[Table 2]

From the results in Tables 1 and 2, the resin composition in which the outermost layer of the coating layer contains 30 to 70% by weight of a thermoplastic polyester elastomer and 30 to 70% by weight of an ethylene copolymer having glycidyl methacrylate as a resin component. It can be seen that the cable of the example of the present invention formed of a crosslinked body has excellent adhesion between the cable covering material and the molded article, the airtightness of the cable end is maintained, and the water resistance is sufficient. . On the other hand, in Comparative Example 1 in which the thermoplastic polyester elastomer out of the resin component is out of the range specified in the present invention, the adhesive strength to the PBT resin and PA resin is sufficient, The cable coating material did not remain, and there was a problem in airtightness after the water resistance test. In Comparative Example 2 in which the ethylene copolymer having glycidyl methacrylate out of the resin component was out of the range specified in the present invention, the tensile strength (TS) and elongation (El) at break after immersion in hot water were reduced. Further, there is a problem that the abrasion resistance is inferior, so that it is not preferable as the cable of the present invention intended for use in automobiles, robots, electronic devices and the like.

[0037]

The cable of the present invention is formed of a resin composition containing 30 to 70% by weight of a thermoplastic polyester elastomer and 30 to 70% by weight of an ethylene copolymer having glycidyl methacrylate as a resin component. Therefore, when molding the end portion of the cable with a thermoplastic resin such as PBT resin or PA resin, the cable coating material and the molding material are firmly adhered to each other, and the cable and the molded body can be molded without special sealing measures. The air-tightness and water-tightness of the interface with the cable are maintained for a long time, and the corrosion of the conductor of the insulated wire inside the cable and the deterioration of the performance of the connected device parts can be prevented. Furthermore, since the cable of the present invention has a coating material having extremely excellent water resistance, heat resistance, and extruding properties, it is stable over time as a wiring cable for automobiles, robots, electronic devices, and the like. Can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a cable according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the cable of the present invention.

FIG. 3 is an explanatory diagram of an airtightness test of a cable terminal portion performed in Examples and Comparative Examples.

FIG. 4 is a configuration explanatory view of a wear resistance evaluation device used in Examples and Comparative Examples.

[Description of Signs] 1 Multi-core stranded wire 1a Conductor 1b Insulating layer 2 Coating layer 2a Inner layer 2b Outer layer 3 Cable 4 Resin molded body 5 Electrode terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H01B 7/18 H01B 7/18 H (72) Inventor Ryoji Ohno 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Inside the corporation

Claims (5)

[Claims] 1. A cable in which a coating layer is provided on the outside of a multifilamentary stranded wire in which a plurality of insulated conductors are twisted, at least the outermost layer of the coating layer contains 30 to 70% by weight of a thermoplastic polyester elastomer and glycidyl methacrylate. A cable comprising a crosslinked product of a resin composition containing 30 to 70% by weight of an ethylene copolymer as a resin component. 2. The cable according to claim 1, wherein the resin composition contains a thermoplastic polyurethane as a resin component other than a thermoplastic polyester elastomer and an ethylene copolymer having glycidyl methacrylate. 3. The cable according to claim 1, wherein the resin composition contains 0.5 to 5 parts by weight of fine particle silica based on 100 parts by weight of the total amount of the resin component. 4. The method according to claim 1, wherein the coating layer comprises two layers, and a resin composition containing at least one selected from the group consisting of thermoplastic polyester elastomer and thermoplastic polyurethane as an inner layer. Claims 1 to 3
The cable according to any of the above. 5. The method according to claim 1, wherein said coating layer comprises two layers, and the inner layer has ethylene.α having a density of 0.86 to 0.90 g / cm ^3.
4. A resin composition comprising at least one selected from the group consisting of an olefin copolymer and an ethylene / vinyl acetate copolymer as a base resin.
The cable according to any of the above.