JP6130229B2 - Silane cross-linked resin composition and electric wire using the same - Google Patents

Description

  The present invention relates to a silane cross-linked resin composition that can be used for insulating coating of electric wires and an electric wire using the silane cross-linked resin composition.

  A silane cross-linked resin composition obtained by copolymerizing a silane compound with polyolefin is known as an insulating coating material for electric wires and cables. When a silanol condensation catalyst is added to such a silane crosslinked resin composition, the crosslinking reaction is promoted.

  Regarding the silanol condensation catalyst, organic zinc compounds, organoaluminum compounds, and the like have been proposed as alternative materials for organotin compounds that have been pointed out as problems with environmental hormones (see, for example, Patent Document 1). These organic zinc-based catalysts and organoaluminum-based catalysts have a crosslinking reaction acceleration performance that is not inferior to this as an alternative material for organic tin-based catalysts that have had problems with environmental hormones.

JP 2002-146150 A

  On the other hand, when the silanol condensation catalyst (organic zinc compound, organoaluminum compound, etc.) described in Patent Document 1 is used, there is a problem that these catalysts are easily hydrolyzed. In addition, the activity of the hydrolyzed catalyst is lowered and the catalytic function is impaired. Therefore, sufficient care was required for handling such as temperature conditions.

  The present invention has been made in view of the problems of such conventional techniques. An object of the present invention is to provide a silane-crosslinked resin composition containing a silanol condensation catalyst that is environmentally friendly and excellent in thermal stability. Furthermore, it is providing the electric wire using the said silane crosslinked resin composition.

（式中、Ｒ及びＲ’は水素原子、ビニル基又はアリール基を表す。） The silane cross-linked resin composition according to the first aspect of the present invention includes a base resin containing an olefin resin as a main component, a silane compound, a phosphine oxide catalyst, and a free radical generator. The phosphine oxide catalyst is represented by the following general formula. Furthermore, content of the phosphine oxide catalyst with respect to 100 parts by mass of the base resin is 0.1 parts by mass or more and 1.0 part by mass or less.

(In the formula, R and R ′ represent a hydrogen atom, a vinyl group or an aryl group.)

  In the silane cross-linked resin composition according to the second aspect of the present invention, in the first aspect, the phosphine oxide-based catalyst comprises 2,5-dihydroxyphenyl (diphenyl) phosphine oxide, diphenylphosphine oxide and diphenylvinylphosphine oxide. At least one compound selected from the group.

  The electric wire which concerns on the 3rd aspect of this invention is equipped with the insulation coating layer obtained by shape | molding the silane crosslinked resin composition which concerns on a 1st or 2nd aspect, and the conductor coat | covered with the said insulation coating layer. .

  The silane cross-linked resin composition of the present invention is environmentally friendly and excellent in thermal stability. That is, the electric wire to which the silane cross-linked resin composition of the present invention is applied exhibits a smooth appearance on the surface and exhibits excellent heat resistance derived from silane cross-linking.

It is sectional drawing which shows the electric wire which concerns on 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the dimension ratio of drawing is exaggerated on account of description, and may differ from an actual ratio.

[Silane cross-linked resin composition]
The silane cross-linked resin composition according to one embodiment of the present invention will be described in detail. The silane cross-linked resin composition of the present embodiment is configured to include a base resin containing an olefin resin as a main component, a silane compound, a phosphine oxide catalyst, and a free radical generator.

  The “base resin” means a main component in the resin composition and means that other components can be contained within a range that does not hinder the function of the main component. Here, the “main component” means occupying 50% by mass or more of the entire resin composition. Further, the base resin contains an olefin resin as a main component. That is, 50% by mass or more of the entire base resin is occupied by the olefin resin. Since such a base resin itself has flexibility, when the silane cross-linked resin composition of the present embodiment is formed as an insulator of an electric wire, the electric wire can be given good flexibility. . From the viewpoint of ensuring sufficient flexibility, the silane cross-linked resin composition of the present embodiment preferably contains 50 to 99% by mass of the base resin. Moreover, it is preferable that the base resin occupies 80 mass% or more of the whole base resin with the olefin resin, and the base resin may consist only of the olefin resin.

  In the present embodiment, examples of the olefin resin include polyethylene (PE), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), and ethylene-vinyl acetate copolymer ( EVA), polypropylene (PP), ethylene-methyl methacrylate copolymer (EMMA) or the like can be used. These can be used alone or in combination.

  As the polyethylene, one or more of high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (L-LDPE) can be mixed and used. That is, these polyethylenes may be used alone or mixed arbitrarily. In addition, a high density has a high crystallinity and tends to be hard. For this reason, from the viewpoint of ensuring sufficient flexibility, it is preferable to use low-density polyethylene or linear low-density polyethylene having low crystallinity and low density.

  In this embodiment, it does not specifically limit as a silane compound which exhibits affinity to both an inorganic material and an organic material, A various well-known thing can be used. For example, methyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane and the like can be mentioned. Considering the reaction efficiency of the silane crosslinking reaction, the content of the silane compound is preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the base resin. However, it is not limited to the above range.

  In this embodiment, a phosphine oxide catalyst is used as the silanol condensation catalyst. Examples of the silanol condensation catalyst include an organic zinc compound, an organic aluminum compound, and the like in addition to the organic tin compound, all of which increase the degree of crosslinking of the silane by its catalytic action. In addition, the phosphine oxide catalyst of the present embodiment can be said to be an environmentally friendly material as compared with the organic tin catalyst in which the problem of environmental hormones is pointed out. Furthermore, the phosphine oxide-based catalyst is excellent in thermal stability as compared with materials that are easily hydrolyzed, such as an organoaluminum catalyst and an organozinc catalyst. Therefore, the catalytic activity can be stably exhibited and the catalytic effect can be sufficiently maintained. As the phosphine oxide catalyst, those represented by the following general formula can be used.

式中、Ｒ及びＲ’は水素原子、ビニル基又はアリール基を表す。また、Ｒ及びＲ’は互いに異なっていてもよく、同一であってもよい。

In the formula, R and R ′ represent a hydrogen atom, a vinyl group or an aryl group. R and R ′ may be different from each other or the same.

  In the present embodiment, the phosphine oxide catalyst preferably contains at least one compound selected from the group consisting of 2,5-dihydroxyphenyl (diphenyl) phosphine oxide, diphenylphosphine oxide and diphenylvinylphosphine oxide. When these compounds are contained, particularly excellent thermal stability can be exhibited and excellent moldability can be exhibited.

  In the silane cross-linked resin composition of the present embodiment, the content of the phosphine oxide catalyst with respect to 100 parts by mass of the base resin is 0.1 parts by mass or more and 1.0 part by mass or less. When the addition amount is less than 0.1 parts by mass, it is difficult to obtain a sufficient degree of crosslinking. On the other hand, when the addition amount exceeds 1.0 part by mass, the appearance during molding tends to be adversely affected.

  In the present embodiment, the free radical generator is not particularly limited as long as it functions as a copolymerization initiator. For example, an organic peroxide can be used. Examples of the organic peroxide include dicumyl peroxide, benzoyl peroxide, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, t-butylperoxyisopropyl carbonate, t -Butyl peroxybenzoate, 2,5-dimethyl-2,5-bis (t-benzoylperoxy) hexane, methyl ethyl ketone peroxide, 2,2-bis (t-butylperoxy) butane, cumene hydroperoxide, etc. Can be used. Considering the reaction efficiency of the silane crosslinking reaction, the content of the free radical generator is preferably 0.05 to 1 part by mass with respect to 100 parts by mass of the base resin. However, it is not limited to the above range.

  In addition to the above-mentioned materials, the silane-crosslinked resin composition of the present embodiment includes an antioxidant for improving the heat aging characteristics as needed, and a lubricant for improving the fluidity or moldability of the resin composition. Can be blended. Furthermore, conventionally known halogen flame retardants, phosphorus flame retardants, inorganic flame retardants and the like as flame retardants can also be added.

  The silane cross-linked resin composition of this embodiment can also contain a filler. As the filler, for example, calcium carbonate, talc, clay or the like can be used.

  Various additives other than the above-described materials can be blended in the silane-crosslinked resin composition of the present embodiment as long as the effects of the present embodiment are not hindered. Additives include flame retardant aids, metal deactivators, anti-aging agents, reinforcing agents, UV absorbers, stabilizers, plasticizers, pigments, dyes, colorants, antistatic agents, foaming agents, and the like. . These blending amounts can also be appropriately set in consideration of the relationship with other components.

  The silane cross-linked resin composition of the present embodiment described above is environmentally friendly and excellent in thermal stability. In particular, when stored at room temperature, the contained silanol condensation catalyst does not decompose and can be stored for a long time. Furthermore, when the silane cross-linked resin composition of the present embodiment is applied to an insulating coating layer of an electric wire, excellent heat resistance as a silane cross-linked polyolefin can be exhibited and a smooth surface can be given.

[Electrical wire]
In FIG. 1, an example of the electric wire which concerns on one Embodiment of this invention is shown. That is, the electric wire 1 is formed by covering a conductor 2 made of a metal or the like with an insulating coating layer 3 made of the silane cross-linked resin composition of the above form. That is, the silane cross-linked resin composition according to the above embodiment can be molded into an insulating coating material. Therefore, the electric wire 1 of the present embodiment can exhibit excellent heat resistance and can have a good appearance.

  The conductor 2 such as metal may be only one strand, or may be formed by bundling a plurality of strands as shown in FIG. As a material of the conductor 2, for example, conductive metal such as copper, plated copper, copper alloy, aluminum, aluminum alloy can be used.

  In the present embodiment, the electric wire 1 may further include a shield layer that covers the insulating coating layer 3 and a sheath layer that further covers the shield layer.

  The shield layer can be formed by knitting a conductive metal foil, a metal-containing foil, or a metal wire (metal conductor) in a mesh shape. With this shield layer, unnecessary electromagnetic wave emission from the electric wire 1 can be prevented.

  The sheath layer is not particularly limited, and an olefin resin such as polyethylene can be used. By this sheath layer, the shield layer can be effectively protected and converged.

  The insulation coating layer 3 of the electric wire 1 of the present embodiment is adjusted by melt-kneading a base resin containing an olefin resin as a main component, a silane compound, a phosphine oxide catalyst, and a free radical generator. That is, the crosslinking reaction is initiated by contact with moisture in the air during kneading of these materials, and the silane compound and the olefin resin are graft polymerized to prepare the silane crosslinked resin composition constituting the insulating coating layer 3. Is done.

  In addition, as a method of melt kneading, a known means can be used. For example, for example, after pre-blending using a high-speed mixing device such as a Henschel mixer, the insulating composition constituting the insulating coating layer 3 by kneading using a known kneader such as a Banbury mixer, a kneader, or a roll mill You can get things.

  And in the electric wire 1 of this embodiment, the method of coat | covering the conductor 2 with the insulation coating layer 3 can also use a well-known means. For example, the insulating coating layer 3 can be formed by a general extrusion method. And as an extruder used by an extrusion molding method, a single screw extruder or a twin screw extruder is used, for example, and what has a screw, a breaker plate, a crosshead, a distributor, a nipple, and a die can be used.

  And when preparing the silane crosslinked resin composition used as the raw material of the insulation coating layer 3, a twin-screw extruder can be used, for example. At that time, each predetermined material is put into a twin-screw extruder and set to a temperature at which the respective material is sufficiently melted. That is, a base resin containing an olefin resin as a main component, a silane compound, a phosphine oxide catalyst, a free radical generator, and the like are charged and melted. At this time, if necessary, other additives as described above can also be added. The melted mixture is melted and kneaded by a screw, and a certain amount is supplied to the crosshead via the breaker plate. The melted and kneaded mixture flows onto the circumference of the nipple by a distributor, and is extruded in a state of being coated on the outer circumference of the conductor by a die, thereby obtaining an insulating coating layer 3 that covers the outer circumference of the metal conductor 2. be able to.

  In the electric wire 1 of the present embodiment, a silane cross-linked resin composition that is silane-coupled using the phosphine oxide catalyst as an insulating coating material is used. And since the silane crosslinked resin composition is highly bridge | crosslinked, it can be set as the electric wire 1 which exhibits the outstanding heat resistance while exhibiting the smooth external appearance.

  In addition, the external appearance of the electric wire 1 can be evaluated by the method as described in the below-mentioned Example, for example. In addition, it is also possible to perform an equipment analysis on the surface of the electric wire and evaluate it. The degree of cross-linking can be evaluated by, for example, the method described in the examples described later. That is, quantitative evaluation is possible by measuring the gel fraction.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

[Example 1]
In Example 1, first, materials shown in Table 1 were prepared as silane cross-linked resin compositions. That is, polyethylene (PE) was used as the olefin resin. The trade name “NUCG-9301” manufactured by Dow Chemical Japan Co., Ltd. was used as PE. In addition, a trade name “TSL8113” (methyltrimethoxysilane) manufactured by Nisso Sangyo Co., Ltd. was used as the silane compound. Diphenylphosphine oxide (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the silanol condensation catalyst. As a free radical generator, trade name “Park Mill (registered trademark) D” (dicumyl peroxide) manufactured by NOF Corporation was used. About these mixing | blendings, a silane compound is 5 mass parts, a silanol condensation catalyst is 0.1 mass part, and a free radical generator is 1 mass part with respect to 100 mass parts of olefin resins. As the silanol condensation catalyst, a catalyst which was allowed to stand for 1 week under an environmental condition of a room temperature of 23 ° C. and a humidity of 50% RH was used.

[Examples 2-3]
The silane cross-linked resin compositions of Example 2 and Example 3 were the same as Example 1 except that the content of diphenylphosphine oxide as a silanol catalyst was 0.5 parts by mass and 1.0 part by mass, respectively. Got ready.

[Comparative Examples 1, 3, 5]
A silane cross-linked resin composition of Comparative Example 1 was prepared in the same manner as in Example 1 except that 1.0 part by mass of zinc laurate (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the silanol catalyst. Moreover, the silane crosslinked resin composition of Comparative Example 3 and Comparative Example 5 was prepared in the same manner as Comparative Example 1 except that 0.5 parts by mass and 0.1 parts by mass of zinc laurate were used.

[Comparative Examples 2, 4, 6]
A silane cross-linked resin composition of Comparative Example 2 was prepared in the same manner as in Example 1 except that 1.0 part by mass of aluminum octylate (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the silanol catalyst. Moreover, the silane crosslinked resin composition of Comparative Example 4 and Comparative Example 6 was prepared in the same manner as Comparative Example 2 except that aluminum octylate was changed to 0.5 parts by mass and 0.1 part by mass, respectively.

[Examples 5, 8, and 11]
The silane cross-linked resin compositions of Examples 5, 8, and 11 were the same as Examples 1, 2, and 3 except that the phosphine oxide compound as a silanol condensation catalyst was used without being allowed to stand for 1 week as described above. I prepared something.

[Examples 4, 7, and 10]
A silane cross-linked resin composition of Example 4 was prepared in the same manner as Example 5 except that diphenylvinylphosphine oxide (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the silanol catalyst. Moreover, the silane crosslinked resin composition of Example 7 and Example 10 was prepared like Example 4 except having used 0.5 mass part and 0.1 mass part of diphenyl vinyl phosphine oxide, respectively.

[Examples 6, 9, and 12]
A silane cross-linked resin composition of Example 6 was prepared in the same manner as in Example 5 except that 2,5-dihydroxyphenyl (diphenyl) phosphine oxide (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the silanol catalyst. Moreover, the silane crosslinked resin of Example 9 and Example 12 was respectively carried out similarly to Example 6 except having used 0.5 mass part and 0.1 mass part of 2, 5- dihydroxyphenyl (diphenyl) phosphine oxide. A composition was prepared.

[Comparative Examples 8 and 11]
The silane cross-linked resin compositions of Comparative Example 8 and Comparative Example 11 were the same as Example 5 except that the content of diphenylphosphine oxide as a silanol catalyst was 0.05 parts by weight and 1.5 parts by weight. Got ready.

[Comparative Examples 7 and 10]
Silane cross-linked resin compositions of Comparative Example 7 and Comparative Example 10, respectively, except that the content of diphenylvinylphosphine oxide as a silanol catalyst was 0.05 parts by mass and 1.5 parts by mass, respectively. Prepared.

[Comparative Examples 9 and 12]
Comparative Example 9 and Comparative Example were the same as Example 6 except that the content of 2,5-dihydroxyphenyl (diphenyl) phosphine oxide as a silanol catalyst was 0.05 parts by mass and 1.5 parts by mass, respectively. 12 silane cross-linked resin compositions were prepared.

[Examples 13 to 14]
A silane crosslinked resin composition of Example 13 was prepared in the same manner as in Example 1 except that ethylene-methyl acrylate copolymer (EMA) was used as the olefin resin. Moreover, the silane crosslinked resin composition of Example 14 was prepared in the same manner as Example 3 except that EMA was used. As EMA, Elvalloy (registered trademark): 1125 manufactured by Mitsui DuPont Chemical Co., Ltd. was used.

[Examples 15 to 16]
A silane cross-linked resin composition of Example 15 was prepared in the same manner as Example 1 except that ethylene-ethyl acrylate copolymer (EEA) was used as the olefin resin. Moreover, the silane crosslinked resin composition of Example 16 was prepared in the same manner as Example 3 except that EEA was used. As EEA, Elvalloy: 12112 manufactured by Mitsui DuPont Chemical Co., Ltd. was used.

[Examples 17 to 18]
A silane cross-linked resin composition of Example 17 was prepared in the same manner as in Example 1 except that ethylene-vinyl acetate copolymer (EVA) was used as the olefin resin. Moreover, the silane crosslinked resin composition of Example 18 was prepared in the same manner as Example 3 except that EVA was used. As EVA, EVAFLEX (registered trademark): EV560 manufactured by Mitsui DuPont Chemical Co., Ltd. was used.

[Examples 19 to 20]
A silane cross-linked resin composition of Example 19 was prepared in the same manner as Example 1 except that polypropylene (PP) was used as the olefin resin. Moreover, the silane crosslinked resin composition of Example 20 was prepared in the same manner as Example 3 except that PP was used. As PP, Sumitomo Chemical Co., Ltd. Sumitomo (registered trademark) Nobrene (registered trademark): EP3711E1 was used.

[Examples 21 to 22]
A silane cross-linked resin composition of Example 21 was prepared in the same manner as in Example 1 except that ethylene-methyl methacrylate copolymer (EMMA) was used as the olefin resin. Moreover, the silane crosslinked resin composition of Example 22 was prepared in the same manner as Example 3 except that EMMA was used. EMMA used was Alift (registered trademark): WH401 manufactured by Sumitomo Chemical Co., Ltd.

  Next, the silane crosslinked resin compositions of each Example and Comparative Example were melted and subjected to extrusion molding, and exposed to 80 ° C. warm water to allow the crosslinking reaction to proceed for 16 hours. Thus, the physical property of the electric wire corresponding to the molded product of each Example and comparative example obtained was evaluated as follows.

[Evaluation of extrusion appearance]
In the external appearance evaluation of the electric wires after extrusion formation according to each of the examples and the comparative examples, the smoothness of the electric wire surface, and the presence or absence of particles and foaming were determined by visual observation and touch. That is, surface roughness such as particles and foam was conspicuous, and those not suitable for use as products or molded articles were evaluated as “x”, and those not so were evaluated as “◯”. These evaluation results are also shown in Tables 1 to 3.

[Gel fraction]
First, the electric wire (sample) of each example was exposed to xylene boiled at 144 ° C. After performing extraction for 10 hours as it was, the sample was sufficiently dried. At the time of the extraction, since the uncrosslinked component is extracted into the solvent, it is evaluated that the crosslinking reaction has sufficiently progressed as the elution amount decreases. And the gel fraction was computed by following Formula as a parameter | index of the progress degree of the bridge | crosslinking. It is evaluated that the higher the gel fraction, the higher the degree of crosslinking, that is, the sufficient heat resistance derived from silane crosslinking.
[Equation 1]
Gel fraction (mass%) = sample weight after extraction / sample weight before extraction × 100

  As shown in Table 1, all of Examples 1 to 3 and Comparative Examples 1 to 6 exhibited a good extrusion appearance. On the other hand, Examples 1-3 using diphenylphosphine oxide as a silanol condensation catalyst had higher gel fraction than any of Comparative Examples 1-6 using an organozinc compound and an organoaluminum compound as a silanol condensation catalyst. . Therefore, according to the silane cross-linked resin composition using a phosphine oxide compound as a silanol condensation catalyst, it is possible to obtain an electric wire that has a good extrusion appearance and exhibits excellent heat resistance derived from silane cross-linking. Is recognized. Furthermore, it is considered that the catalyst quality of the silane-crosslinked resin composition using the phosphine oxide compound is not impaired even when stored for 1 week in an environment of room temperature 23 ° C. and humidity 50% RH.

  Moreover, as shown in Table 2, it turns out that the addition amount of the phosphine oxide compound which is a silanol condensation catalyst affects the physical property of the electric wire after shaping | molding. In Examples 5, 8, and 11 using diphenylphosphine oxide as a silanol condensation catalyst, an electric wire having a good extrusion appearance and exhibiting excellent heat resistance derived from silane crosslinking is obtained. These are added in an amount of 0.1 to 1.0 parts by mass with respect to 100 parts by mass of the olefin resin. On the other hand, in Comparative Example 8 having a smaller content than this range, a sufficient gel fraction cannot be obtained, and it is not recognized that excellent heat resistance derived from silane crosslinking is exhibited. Further, in Comparative Example 11 having a larger content than this range, the gel fraction is high, but the appearance is impaired.

  In Examples 4, 7, and 10 using diphenylvinylphosphine oxide as a silanol condensation catalyst, an electric wire having a good extruded appearance and exhibiting excellent heat resistance derived from silane crosslinking is obtained. These are added in an amount of 0.1 to 1.0 parts by mass with respect to 100 parts by mass of the olefin resin. On the other hand, in Comparative Example 7 having a content smaller than this range, a sufficient gel fraction cannot be obtained, and it is not recognized that excellent heat resistance derived from silane crosslinking is exhibited. In Comparative Example 10 having a content larger than this range, the gel fraction is high, but the appearance is impaired.

  In Examples 6, 9, and 12 using 2,5-dihydroxyphenyl (diphenyl) phosphine oxide as a silanol condensation catalyst, the electric wire has excellent extrusion appearance and exhibits excellent heat resistance derived from silane crosslinking. Is obtained. These are added in an amount of 0.1 to 1.0 parts by mass with respect to 100 parts by mass of the olefin resin. On the other hand, in Comparative Example 9 having a content smaller than this range, a sufficient gel fraction cannot be obtained, and it is not recognized that excellent heat resistance derived from silane crosslinking is exhibited. Further, in Comparative Example 12 having a larger content than this range, the gel fraction is high, but the appearance is impaired.

  Moreover, as shown in Table 3, the wires of Examples 13 to 22 using olefin resins other than polyethylene (EMA, EEA, EVA, PP, EMMA) were also excellent as in Examples 1 to 3. Demonstrated physical properties. That is, it is recognized that the electric wires of Examples 13 to 22 also have excellent extrusion appearance and exhibit excellent heat resistance derived from silane crosslinking. Furthermore, it is considered that the catalyst quality of the silane-crosslinked resin composition using the phosphine oxide compound is not impaired even when stored for 1 week in an environment of room temperature 23 ° C. and humidity 50% RH.

  As is clear from the comparison between the above examples and comparative examples, the silane cross-linked resin composition satisfying the desired constitution of the present invention is excellent in storage stability under a normal temperature environment, and has a good appearance and sufficient An electric wire that exhibits heat resistance can be obtained. And it is recognized that the electric wire obtained using the said silane crosslinked resin composition exhibits the outstanding heat resistance while showing the external appearance with the smooth surface.

  Although the present invention has been described with reference to the examples and comparative examples, the present invention is not limited to these, and various modifications can be made within the scope of the gist of the present invention.

1 Electric wire 2 Conductor 3 Insulation coating layer

Claims (3)

Including a base resin containing an olefin resin as a main component, a silane compound, a phosphine oxide catalyst and a free radical generator;
The phosphine oxide catalyst is represented by the following general formula:

(In the formula, R and R ′ represent a hydrogen atom, a vinyl group or an aryl group.)
Content of the said phosphine oxide type catalyst with respect to 100 mass parts of said base resins is 0.1 to 1.0 mass part, The silane crosslinked resin composition characterized by the above-mentioned.   The phosphine oxide-based catalyst includes at least one compound selected from the group consisting of 2,5-dihydroxyphenyl (diphenyl) phosphine oxide, diphenylphosphine oxide, and diphenylvinylphosphine oxide. A silane cross-linked resin composition. An insulating coating layer obtained by molding the silane-crosslinked resin composition according to claim 1,
A conductor coated with the insulating coating layer;
An electric wire comprising:

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