JP2022153974A - Vinyl chloride resin composition, and insulated wire using the same - Google Patents

Abstract

To improve extrusion molding characteristics and long run heat resistance of an insulating layer.SOLUTION: An electric wire (insulated wire) 10 has a conductor 11, and an insulating layer 12 coating the conductor 11. The insulating layer 12 contains, with respect to 100 pts.mass of polyvinyl chloride, 4 pts.mass or more of hydrotalcite, and 0.03 pts.mass or more of polyethylene oxide and calcium laurate as the sum total.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a vinyl chloride resin composition and an insulated wire using the same.

As a stabilizer for improving the stability of the vinyl chloride polymer against heat and light, there is a technique of adding a surface-treated hydrotalcite to the vinyl chloride polymer (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-40614

For example, in insulated wires used for internal wiring of electronic equipment, there is a need to reduce the coating thickness of the insulating layer that covers the conductor from the viewpoint of miniaturization and weight reduction of the electronic equipment. A vinyl chloride resin composition is used as a covering material for an insulated wire. Vinyl chloride resin (polyvinyl chloride; PVC) contains chlorine, which is a halogen, in its chemical structure, and the vinyl chloride resin alone has high flame retardancy. Since vinyl chloride resin is hard, when it is used as a coating material for electric wires, a plasticizer for softening the vinyl chloride resin composition is added to the vinyl chloride resin base polymer. However, due to the influence of additives such as plasticizers, the properties of vinyl chloride resin compositions (e.g., flame retardancy, heat deformation properties, electrical properties, extrusion line speed during wire coating processing, heat resistance, etc.) change. , the characteristics may deteriorate. The inventors of the present application have studied the improvement of the properties of a vinyl chloride resin composition, particularly a vinyl chloride resin composition that is particularly suitable for use as a coating material for electric wires.

An object of the present invention is to provide a vinyl chloride resin composition capable of improving extrusion molding properties and long-run heat resistance of an insulating layer.

The vinyl chloride resin composition of one embodiment comprises [1] 4 parts by mass or more of hydrotalcite and 0.03 parts by mass or more of polyethylene oxide and calcium laurate in total per 100 parts by mass of polyvinyl chloride. and including.

[2] For example, in [1], 0.1 parts by mass or more of a phenolic antioxidant and a plasticizer are further included with respect to 100 parts by mass of the polyvinyl chloride, and the phenolic antioxidant is The phenolic antioxidant added to the plasticizer is included, and the value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) is 0.02 or less.

[3] For example, in [1], stearic acid-based metal soap is further included in a total amount of 1 part by mass or more with respect to 100 parts by mass of the polyvinyl chloride.

[4] An insulated wire according to another embodiment has a conductor and an insulating layer covering the conductor. The insulating layer contains 4 parts by mass or more of hydrotalcite and 0.03 parts by mass or more of polyethylene oxide and calcium laurate in total with respect to 100 parts by mass of polyvinyl chloride.

[5] For example, in [4], 0.1 parts by mass or more of a phenolic antioxidant and a plasticizer are further included with respect to 100 parts by mass of the polyvinyl chloride, and the phenolic antioxidant is The phenolic antioxidant added to the plasticizer is included, and the value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) is 0.02 or less.

[6] For example, in [5], the thickness of the insulating layer covering the conductor is 0.2 mm or less, and the insulating layer is crosslinked by irradiating an electron beam with an intensity of 5 Mrad or less. there is

[7] For example, in [ ₆ ], the insulating layer further includes calcined clay and clay containing more _SiO2 than _Al2O3 .

[8] For example, in [6], a black processing pigment is further included, and the black processing pigment includes diisononyl phthalate (DINP).

[9] For example, in [4], stearic acid-based metallic soap is further included in a total amount of 1 part by mass or more with respect to 100 parts by mass of the polyvinyl chloride.

According to a representative embodiment of the present invention, the extrusion properties and long-run heat resistance of the insulating layer can be improved.

It is a sectional view showing an example of structure of an electric wire which is one embodiment. FIG. 2 is a cross-sectional view showing a structural example of a cable including the electric wire shown in FIG. 1;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<Example of basic structure of wire and cable>
FIG. 1 is a cross-sectional view showing a structural example of an electric wire according to one embodiment. FIG. 2 is a cross-sectional view showing a structural example of a cable including the electric wires shown in FIG.

An electric wire (insulated electric wire) 10 shown in FIG. 1 has a conductor 11 and an insulating layer 12 covering the conductor 11 . The electric wire 10 is an insulated electric wire. The insulating layer 12 is crosslinked, for example. The electric wire 10 can be said to be a bridge insulated electric wire.

A cable 20 shown in FIG. 2 has a plurality of wires 10 and a sheath (insulating layer) 21 that collectively covers the plurality of wires 10 . The example shown in FIG. 2 shows an example in which the sheath 21 covers two electric wires 10 . However, the number of wires 10 in the sheath 21 is not limited to two, and may be three or more, for example. Moreover, as shown in FIG. 2, it is preferable that all the electric wires covered by the sheath 21 are the electric wires 10. may be covered with

Moreover, although the vinyl chloride resin composition as the material of the insulating layer 12 will be described below, the vinyl chloride resin composition described below can also be used as the material of the sheath 21 shown in FIG.

<Vinyl chloride resin composition>
The inventors of the present application have made efforts to improve the properties of a vinyl chloride resin composition that is particularly suitable for use as an insulating layer of an insulated wire. In the following embodiments, techniques for improving the properties of a vinyl chloride resin composition obtained by adding additives to a vinyl chloride resin as a base polymer will be described. The vinyl chloride resin composition used for the insulating layer 12 of the electric wire 10 shown in FIG. 1 will be described below. As for electric wires 10 used for internal wiring of electronic devices, there is an increasing need for thin electric wires in which conductors 11 are coated with a thin insulation layer 12 from the viewpoint of making electronic devices more compact or lighter. . Addition of a plasticizer to improve the workability of the vinyl chloride resin changes the properties of the vinyl chloride resin composition. For example, the flame retardancy of the vinyl chloride resin composition is likely to be lower than that of the vinyl chloride resin alone. Further, for example, the electrical properties of the vinyl chloride resin composition (insulation properties, properties related to electrical noise, etc.) or heat deformation properties may be lower than those of the vinyl chloride resin alone. In particular, when the coating thickness of the insulating layer 12 is reduced, a semi-rigid vinyl chloride resin composition containing a reduced amount of plasticizer may be used. In this case, compared with a soft vinyl chloride resin composition to which a sufficient amount of plasticizer was added, the extrusion molding properties of the coating material, particularly the stability of the outer diameter dimension, and the long-run heat resistance (described in the examples) No scorching (carbides) occurs when extrusion is continuously performed under the predetermined conditions of (1), or the line speed during extrusion tends to decrease. In addition, when an insulating layer made of a semi-rigid vinyl chloride resin composition is irradiated with an electron beam for cross-linking, the degree of cross-linking tends to be suppressed.

Therefore, the inventors of the present application have investigated a vinyl chloride resin composition capable of improving the extrusion molding properties and long-run heat resistance of the insulating layer 12 when the coating thickness of the insulating layer 12 is reduced.

The vinyl chloride resin composition constituting the insulating layer 12 shown in FIG. 1 includes (A) polyvinyl chloride (vinyl chloride resin) as a base polymer, (D) hydrotalcite, and (E) polyethylene oxide and calcium laurate. and including. Specifically, 4 parts by mass or more of hydrotalcite and 0.03 parts by mass or more of polyethylene oxide and calcium laurate in total are included with respect to 100 parts by mass of polyvinyl chloride. In addition, the vinyl chloride resin composition constituting the insulating layer 12 contains 0.1 parts by mass or more of (C) a phenolic antioxidant and (F) a plasticizer with respect to 100 parts by mass of polyvinyl chloride. It is preferable to further include. (C) The phenolic antioxidant includes the phenolic antioxidant added to the (F) plasticizer, and the added amount of the phenolic antioxidant is divided by the added amount of TMPT (trimethylolpropane triacrylate). is preferably 0.02 or less. Moreover, it is preferable to further contain (B) a stearic acid-based metal soap in an amount of 1 part by mass or more in total with respect to 100 parts by mass of polyvinyl chloride.

[Base polymer]
The vinyl chloride resin composition of the present embodiment contains (A) polyvinyl chloride as a base polymer. One or more types of polyvinyl chloride having a K value of 71.6 or more can be selected and used as the base polymer. K value is a value measured by a test method specified in JIS K7367-2 or ISO 1628-2. The K value can be used as an indicator of the degree of polymerization. When the vinyl chloride resin composition is crosslinked by irradiating with an electron beam, from the viewpoint of giving a certain degree of heat resistance and heat deformation characteristics after irradiating with an electron beam, one with a K value of 71.6 is used alone. It is preferable to use one having a K value of 75.7 or more and 78.1 or less rather than using .

[Flame retardants]
Flame retardants such as antimony trioxide, aluminum hydroxide, brominated flame retardants, and amorphous silica are added. In addition, the above-mentioned (D) hydrotalcite also functions as a flame retardant. When a large amount of aluminum hydroxide is added as a flame retardant, the heat resistance of the vinyl chloride resin composition is lowered. By adding hydrotalcite, which functions as a flame retardant and a hydrogen chloride scavenger, both heat resistance and flame retardancy can be achieved. As for the amount of hydrotalcite added, as described above, it is preferable that 4 parts by mass or more of hydrotalcite is added to 100 parts by mass of polyvinyl chloride. Thereby, long-run heat resistance of the vinyl chloride resin composition can be obtained. Further, by adding 4 parts by mass or more of hydrotalcite, the pressure resistance of the vinyl chloride resin composition after cross-linking treatment by electron beam irradiation can be improved. Although the details will be described later, according to the results of experimental evaluation by the inventor of the present application, the addition of 4 parts by mass or more of hydrotalcite reduces the , an insulating layer 12 having dielectric strength performance against a spark voltage of 6000V is obtained. Further, by adding 4 parts by mass or more of hydrotalcite, the long-run heat resistance of the vinyl chloride resin composition can be improved.

Incidentally, when the amount of hydrotalcite added increases, the lubricity of the vinyl chloride resin composition increases. (E) Increasing the amount of polyethylene oxide and calcium laurate added can suppress the increase in lubricity, but from the viewpoint of the electrical properties of the vinyl chloride resin composition (and from the viewpoint of raw material costs), When the vinyl is 100 parts by mass, the amount of polyethylene oxide and calcium laurate added is preferably 1 part by mass or less. Therefore, the amount of hydrotalcite to be added is preferably less than 10 parts by mass with respect to 100 parts by mass of polyvinyl chloride.

On the other hand, from the viewpoint of reducing the lubricity of the vinyl chloride resin composition to which 4 parts by mass or more of hydrotalcite is added, when the polyvinyl chloride is 100 parts by mass, (E) polyethylene oxide and calcium laurate The total amount added must be 0.03 parts by mass or more. (E) The total amount of polyethylene oxide and calcium laurate added is 0.03 parts by mass or more to improve the uniformity of the thickness when the polyvinyl chloride resin composition is molded as the insulating layer 12. can be done. Although the details will be described later, for example, according to the results of experimental evaluation by the inventor of the present application, when the line speed during extrusion molding is 200 m / min, it is set to 0.1 mm to 0.2 mm The maximum error of the coating thickness of the insulating layer 12 can be 30 μm or less. Further, the total amount of polyethylene oxide and calcium laurate added is preferably 0.6 parts by mass or less.

[Stabilizer]
When the dehydrochlorination reaction is accelerated by the flame retardant, the vinyl chloride resin composition may be discolored when irradiated with an electron beam as a cross-linking treatment. Therefore, a stabilizer is added to suppress discoloration of the vinyl chloride resin composition due to electron beam irradiation. The stabilizer contains (B) a stearic acid-based metallic soap. Examples of stearic acid-based metal soaps include zinc stearate, calcium stearate, magnesium stearate, and stearylbenzoylmethane. As described above, the stearic acid-based metallic soap is added in an amount of 1 part by mass or more in total for 100 parts by mass of polyvinyl chloride. The total amount of the stearic acid-based metal soap to be added is preferably 1.5 parts by mass or less with respect to 100 parts by mass of polyvinyl chloride.

[Plasticizer]
(F) The plasticizer is not particularly limited, and known plasticizers can be used. However, it is preferable to use a trimellitate plasticizer. Examples of trimellitate-based plasticizers include tri-2-ethylhexyl trimellitate, tri-normal alkyl trimellitate, triisononyl trimellitate, and isodecyl trimellitate. In the examples described later, TOTM (tri-normal alkyl trimellitate) (Trimex N-08 manufactured by Kao Corporation: phenolic antioxidant amount 0.5% by mass) or TINTM (isononyl trimellitate) (UPC) 0.35% by mass of phenolic antioxidant) was used, but other trimellitate esters can be used by adjusting the irradiation intensity and the amount added during the cross-linking treatment.

[Other additives]
The vinyl chloride resin composition of the present embodiment contains (C) a phenolic antioxidant as an antioxidant. Phenolic antioxidants include 1,3,5-tris[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]-1,3,5-triazine-2,4 ,6(1H,3H,5H)-trione, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 3-(3,5-di-tert-butyl- 4-hydroxyphenyl)stearyl propionate, 4,4′-butylidenebis-(6-tert-butyl-3-methylphenol) and the like. When the polyvinyl chloride is 100 parts by mass, the amount of the phenolic antioxidant added is preferably 0.15 parts by mass or less.

In addition to the base polymer and each additive described above, if necessary, lubricants, colorants, fillers, processing aids, ultraviolet absorbers, light stabilizers, cross-linking aids, and other modifiers Among them, one or more of them may be used in combination. Lubricants include metal soap-based magnesium stearate, fatty acid-based stearic acid, silicone, fatty acid amide-based, hydrocarbon-based, ester-based, and alcohol-based lubricants. The (E) polyethylene oxide and calcium laurate described above function as processing aids. Examples of fillers include carbon, clay (including calcined clay), zinc oxide, tin oxide, titanium oxide, magnesium oxide, molybdenum oxide, silicon compounds, quartz, calcium carbonate, magnesium carbonate, and white carbon.

Crosslinking aids include trimethylolpropane trimethacrylate (TMPT), triallyl isocyanurate, dipentaerythritol hexaacrylate, triallyl cyanurate, N,N'-metaphenylene bismaleimide, ethylene glycol dimethacrylate, zinc acrylate, and zinc methacrylate.

Among the cross-linking aids described above, addition of TMPT provides the following advantages. Therefore, the vinyl chloride resin composition of the present embodiment preferably contains TMPT. TMPT is an acrylate monomer with three functional groups. By electron beam irradiation, TMPT itself bonds between molecules of polyvinyl chloride to form a crosslinked structure, so it is effective as a crosslink aid. With TMPT, this reaction occurs even at low doses due to the high reactivity of the monomer.

As described above, the value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) must be 0.02 or less. By adding a phenolic antioxidant, deterioration of the vinyl chloride resin due to electron beam irradiation can be suppressed. However, since the phenol-based antioxidant captures and stabilizes the radical site that is the starting point of the cross-linking reaction of TMPT, it works as a cross-linking inhibitor. By setting the ratio of the phenolic antioxidant to the amount of TMPT added to 0.02 or less, the degree of cross-linking can be adjusted without lowering the performance. The ratio of the phenolic antioxidant to the amount of TMPT added is preferably 0.01 or more.

Further, although the details will be described later, when a cross-linking test is performed by irradiating the insulating layer 12 shown in FIG. Preferably, the insulating layer 12 is crosslinked by irradiating electron beams with an intensity of 5 Mrad or less. Thereby, in the evaluation of the insulating layer 12, the heat resistance can be improved.

Moreover, it is preferable that the insulating layer 12 further includes calcined clay and clay containing more SiO ₂ than Al ₂ O ₃ . The combined use of the calcined clay and the clay containing more SiO ₂ than Al ₂ O ₃ increases the ability to supplement the anionic electrolyte. As a result, electrical characteristics can be improved.

Moreover, the insulating layer 12 further contains a black processing pigment, and the black processing pigment preferably contains diisononyl phthalate (DINP). This promotes plasticization when the vinyl chloride resin composition is kneaded, thereby improving moldability.

<Evaluation>
Next, examples of the electric wire 10 shown in FIG. 1 and several comparative examples for the examples were produced, and evaluation results for each will be described. Table 1 shows the blending ratios and evaluation results of Examples 1 to 6. Table 2 shows the blending ratios and evaluation results of Examples 7 to 12. Table 3 shows the blend ratios and evaluation results of Comparative Examples 1 to 6.

A plurality of examples shown in Tables 1 and 2 and a plurality of comparative examples shown in Table 3 were each manufactured to have the same structure as the electric wire 10 shown in FIG. 1 by the following procedure. The conductor 11 is, for example, a tin-plated conductor in which a tin-plated annealed copper wire having an outer diameter of 0.127 mmφ is used as a strand and seven strands are twisted. The diameter of the conductor 11 is, for example, 0.38 mm. For the insulating layer 12, the compositions shown in Tables 1 to 3 were kneaded in an open roll mixer heated to 170° C. and pelletized in a granulator to obtain a vinyl chloride resin composition. Then, the obtained vinyl chloride resin composition was extruded using an extruder to cover the conductor 11 . The thickness (coating thickness) of the insulating layer 12 made of the vinyl chloride resin composition was, for example, 0.1 mm. Extrusion was performed at a linear speed of 300 m/min with a cylinder temperature of 170° C. and a head temperature of 180° C., for example. After that, cross-linking treatment was performed by irradiating the obtained electric wire 10 with an electron beam. The dose of electron beam was set to 3.5 Mrad. Examples in which the coating thickness of the insulating layer 12 and the irradiation conditions of the electron beam are changed will be described later.

Among the evaluation items in Tables 1 to 3, the item "stability of outer diameter during high-speed extrusion" was evaluated as follows. That is, extrusion molding was performed at a linear speed of 300 m / min, and the wire 10 was sampled after 5 minutes, 30 minutes, and 60 minutes, and the diameters of four points on the cross section of the wire 10 were measured using a microscope. measured. After 5 minutes, 30 minutes, and 60 minutes, among the four measured values of the diameter, if the difference between the maximum value and the minimum value is within 30 μm, it is evaluated as ◯, and any one is 30 μm. When it exceeded, it evaluated as x.

Among the evaluation items in Tables 1 to 3, the item "heat resistance during extrusion" was evaluated as follows. That is, extrusion molding was performed continuously for 60 minutes at a line speed of 300 m/min, and no burning (carbide) was observed, no foaming was observed in the insulating layer 12, and after the extruder was dismantled, Those that satisfied the three conditions that no adhesion of carbide was observed were evaluated as ◯, and those that did not satisfy even one of the above three conditions were evaluated as x.

Among the evaluation items in Tables 1 to 3, the item "Pressure resistance during extrusion/after electron beam irradiation" was evaluated as follows. That is, for the evaluation during extrusion, a withstand voltage (dielectric withstand voltage) test was performed using a 6000 V charging spark tester while molding with an extruder. For the evaluation after the electron beam irradiation, the electric wire 10 with the insulating layer 12 cross-linked by the electron beam irradiation was similarly subjected to a breakdown voltage (dielectric withstand voltage) test using a spark tester charged at 6000V. Those in which conduction due to sparks was not confirmed were evaluated as ◯. Those in which continuity due to spark was confirmed were evaluated as x.

Among the evaluation items in Tables 1 to 3, the item "Degree of cross-linking" was evaluated as follows. That is, the insulating layer 12 was removed from the electric wire 10 after electron beam irradiation, and the gel fraction was measured using this as a sample. Tetrahydrofuran was used as a solvent, and extraction was performed by immersing in the solvent at 70° C. for 24 hours. The weight of the sample before and after extraction was measured, and the weight after extraction/weight before extraction×100 was calculated as the gel fraction. When the calculated gel fraction value was 50% or more, it was evaluated as ◯, and when it was less than 50%, it was evaluated as x.

Among the raw materials shown in Tables 1 to 3, Insulite LHM-103HP manufactured by Mizusawa Chemical Industry Co., Ltd. was used as the SiO ₂ -rich surface treatment clay. The black processed pigment (MXE9749 black) is a processed pigment containing 20 to 45% carbon and made of PVC, DINP and a dispersant. The black processing pigment (EP4715 black) is a processing pigment containing 10 to 40% carbon and containing plasticizers other than PVC and DINP and other additives.

As shown in Tables 1 and 2, the vinyl chloride resin compositions constituting the insulating layers of the insulated wires of Examples 1 to 12 consisted of (A) polyvinyl chloride (vinyl chloride resin) as a base polymer. , (B) a stearic acid-based metal soap, (C) a phenolic antioxidant, (D) hydrotalcite, (E) polyethylene oxide and calcium laurate, and (F) a plasticizer. . Specifically, for 100 parts by mass of polyvinyl chloride, a total of 1 part by mass or more of stearic acid-based metal soap, 0.1 part by mass or more of phenolic antioxidant, and 4 parts by mass or more of hydrotalcite , a total of 0.03 parts by mass or more of polyethylene oxide and calcium laurate, and a plasticizer. (C) Phenolic antioxidant includes a phenolic antioxidant added in (F) plasticizer. The value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) is 0.02 or less.

As shown in Comparative Examples 1 to 4 in Table 3, when the value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) exceeds the evaluation of the degree of crosslinking. It was ×.

As shown in Comparative Examples 1, 4, and 5 in Table 3, when the amount of hydrotalcite added was less than 4 parts by mass, the heat resistance during extrusion was evaluated as x.

Further, as shown in Examples 1 to 12 shown in Tables 1 and 2 and Comparative Examples 1 to 5 shown in Table 3, the total amount of polyethylene oxide and calcium laurate added was 0.03 parts by mass or more. By doing so, it is possible to evaluate the stability of the outer diameter dimension during high-speed extrusion as ◯. It is believed that the internal lubricity of the admixture was improved, and a more stable supply state was obtained in the extruder, especially in the metering zone, leading to the stabilization of the outer diameter.

Next, the relationship between the processing conditions for the insulating layer 12 of the electric wire 10 shown in FIG. 1 and each evaluation item described above will be described. Table 4 is a table showing the relationship between the processing conditions for the insulating layer of the insulated wire and the evaluation results of its characteristics. The composition of each example shown in Table 4 was the same as that of Example 3 shown in Table 1. In each example shown in Table 4, the test was performed by changing the coating thickness of the insulating layer and the dose of the electron beam. In addition, in the item of "heat aging test" shown in Table 4, evaluation was performed as follows. That is, after electron beam irradiation, the vinyl chloride resin composition constituting the insulating layer of the electric wire was heated under conditions of maintaining at 136° C. for 168 hours, and the change in elongation rate of the vinyl chloride resin composition before and after heating was evaluated. did. When the elongation after heating was 65% or more of the elongation before heating, it was evaluated as ◯, and when it was less than 65%, it was evaluated as x.

As shown in Examples 13 to 17 in Table 4, "stability of outer diameter during high-speed extrusion", "heat resistance during extrusion", "pressure resistance during extrusion/after electron beam irradiation", and "degree of cross-linking , all of which were evaluated as 0 even when the conditions of the insulating layer were changed. However, in the item of "heat aging test", the evaluation results of Examples 16 and 17 were x. Examples 16 and 17 are examples in the case of irradiating an electron beam with a high irradiation intensity. It was found that the degree of cross-linking can be improved by irradiating electron beams with a high irradiation intensity, but a decrease in heat resistance can be confirmed. The value of the degree of cross-linking in Example 16 is 1.4 times the value of the degree of cross-linking in Example 15, and the value of the degree of cross-linking in Example 17 is 1.0 times the value of the degree of cross-linking in Example 15. .6 times. From this result, when a bridging test is performed by irradiating the insulating layer 12 shown in FIG. is preferably crosslinked by irradiation with an electron beam having an intensity of 5 Mrad or less.

The present invention is not limited to the above embodiments and examples, and can be modified in various ways without departing from the scope of the invention.

The invention is applicable to wires and cables.

10 Electric wire 11 Conductor 12 Insulating layer 20 Cable 21 Sheath (insulating layer)

Claims (9)

Per 100 parts by mass of polyvinyl chloride,
4 parts by mass or more of hydrotalcite;
A total of 0.03 parts by mass or more of polyethylene oxide and calcium laurate;
A vinyl chloride resin composition comprising: In claim 1,
For 100 parts by mass of the polyvinyl chloride,
0.1 parts by mass or more of a phenolic antioxidant;
a plasticizer;
further comprising
The phenolic antioxidant includes a phenolic antioxidant added to the plasticizer,
A vinyl chloride resin composition, wherein the value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) is 0.02 or less. In claim 1,
A vinyl chloride resin composition further comprising 1 part by mass or more of a stearic acid-based metallic soap in total with respect to 100 parts by mass of the polyvinyl chloride. a conductor;
an insulating layer covering the conductor;
has
The insulating layer is
Per 100 parts by mass of polyvinyl chloride,
4 parts by mass or more of hydrotalcite;
A total of 0.03 parts by mass or more of polyethylene oxide and calcium laurate;
Insulated wire, including In claim 4,
For 100 parts by mass of the polyvinyl chloride,
0.1 parts by mass or more of a phenolic antioxidant;
a plasticizer;
further comprising
The phenolic antioxidant includes a phenolic antioxidant added to the plasticizer,
An insulated wire, wherein the value obtained by dividing the added amount of the phenolic antioxidant by the added amount of TMPT (trimethylolpropane triacrylate) is 0.02 or less. In claim 5,
The thickness of the insulation layer covering the conductor is 0.2 mm or less,
The insulating layer is crosslinked by irradiation with an electron beam having an intensity of 5 Mrad or less.
insulated wire. In claim 6,
The insulating layer is
calcined clay;
a clay with a higher _SiO2 content than _{Al2O3 content} ;
insulated wire. In claim 7,
further comprising a black processing pigment,
The insulated wire, wherein the black processing pigment comprises diisononyl phthalate (DINP). In claim 4,
An insulated wire further comprising a stearic acid-based metallic soap of 1 part by mass or more in total with respect to 100 parts by mass of the polyvinyl chloride.

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