JPH10324839A - Composition for watertight sealing of cable conductor - Google Patents
Composition for watertight sealing of cable conductorInfo
- Publication number
- JPH10324839A JPH10324839A JP9133994A JP13399497A JPH10324839A JP H10324839 A JPH10324839 A JP H10324839A JP 9133994 A JP9133994 A JP 9133994A JP 13399497 A JP13399497 A JP 13399497A JP H10324839 A JPH10324839 A JP H10324839A
- Authority
- JP
- Japan
- Prior art keywords
- amorphous
- carbon black
- olefin
- weight
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Insulated Conductors (AREA)
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paints Or Removers (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ケーブル導体の水
密用組成物に関し、特に海底ケーブル等の高水圧下に用
いられるケーブルより線導体の間隙に充填される水密用
組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watertight composition for a cable conductor, and more particularly to a watertight composition filled in a gap between a cable strand conductor and a cable used under high water pressure such as a submarine cable.
【０００２】[0002]
【従来の技術】海底ケーブル等の高水圧下に用いられる
ケーブル導体の水密用組成物としては、従来よりブチル
ゴムとカーボンブラックとからなる組成物、ポリブテン
とカーボンブラックとからなる組成物、あるいはアタク
チックポリプロピレンとワックスとグラファイトとから
なる組成物が知られている。2. Description of the Related Art As a watertight composition for a cable conductor used under high water pressure, such as a submarine cable, a composition comprising butyl rubber and carbon black, a composition comprising polybutene and carbon black, or an atactic Compositions comprising polypropylene, wax and graphite are known.
【０００３】しかしブチルゴムを用いた前記組成物は溶
融粘度が大きいため、より線導体間への充填には吐出力
の大きい専用の押出機が必要となり、溶融粘度を高める
ために押出温度を上げると、組成物が劣化しやすいとい
う問題がある。またポリブテンやアタクチックポリプロ
ピレンを用いた前記組成物は溶融粘度が低く、比較的簡
易なポンプで充填可能であるが、導体への密着性あるい
は組成物自体の凝集力に乏しいため、海底ケーブル等の
高水圧下での水密性が不十分である。However, since the above-mentioned composition using butyl rubber has a high melt viscosity, a special extruder having a large discharge force is required for filling between the wire conductors. In addition, there is a problem that the composition is easily deteriorated. In addition, the composition using polybutene or atactic polypropylene has a low melt viscosity and can be filled with a relatively simple pump, but because of poor adhesion to conductors or poor cohesion of the composition itself, such as submarine cables and the like. Insufficient water tightness under high water pressure.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記従来の
水密用組成物の有する問題点を解決することを目的と
し、比較的簡易なポンプで充填可能であり、高水圧下で
も優れた水密性を有するケーブル導体の水密用組成物の
提供を目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the above-mentioned conventional water-tight compositions, which can be filled with a relatively simple pump and have excellent water-tightness even under high water pressure. It is an object of the present invention to provide a watertight composition for a cable conductor having properties.
【０００５】[0005]
【課題を解決するための手段】本発明のケーブル導体の
水密用組成物は、アモルファスポリ−α−オレフィン、
ポリブテン及びテルペン樹脂が分散媒体として含有さ
れ、特定の比表面積を有するカーボンブラックが導電性
付与剤として含有されたものである。即ち、本発明の水
密用組成物は、アモルファスポリ−α−オレフィン、ポ
リブテン、テルペン樹脂及び比表面積が６００〜１２０
０ｍ2 ／ｇのカーボンブラックを含有することを特徴と
するものである。The composition for watertightening a cable conductor according to the present invention comprises an amorphous poly-α-olefin,
Polybutene and a terpene resin are contained as a dispersion medium, and carbon black having a specific specific surface area is contained as a conductivity imparting agent. That is, the watertight composition of the present invention has an amorphous poly-α-olefin, polybutene, terpene resin and a specific surface area of 600 to 120.
It is characterized by containing 0 m 2 / g of carbon black.
【０００６】本発明の水密用組成物に配合されるアモル
ファスポリ−α−オレフィンは、非晶性のランダムコポ
リマーであり、例えばアタクチックポリプロピレンは結
晶性のポリプロピレン（アイソタクチックポリプロピレ
ン）よりも平均分子量、溶融粘度、結晶化度、ショアー
Ｄ硬度等の値が低い特徴を有する。アモルファスポリ−
α−オレフィンとしては、ポリαオレフィンの密度測定
法による結晶化度が２％以下のものが好ましい。例えば
アモルファスプロピレン単独重合体、アモルファスプロ
ピレン・エチレン共重合体、アモルファスプロピレン・
ブテン−１共重合体、アモルファスプロピレン・エチレ
ン・ブテン−１三元共重合体、アモルファスプロピレン
・ペンテン−１共重合体、アモルファスプロピレン・オ
クテン−１共重合体等が挙げられ、１９０℃における溶
融粘度が４００〜９０００ｃｐｓ、好ましくは５００〜
５０００ｃｐｓを有するものが好ましい。The amorphous poly-α-olefin compounded in the watertight composition of the present invention is an amorphous random copolymer. For example, atactic polypropylene has a higher average molecular weight than crystalline polypropylene (isotactic polypropylene). Low melt viscosity, crystallinity, Shore D hardness, etc. Amorphous poly
As the α-olefin, those having a polycrystallinity of 2% or less by a density measurement method of polyα olefin are preferable. For example, amorphous propylene homopolymer, amorphous propylene / ethylene copolymer, amorphous propylene
Butene-1 copolymer, amorphous propylene / ethylene / butene-1 terpolymer, amorphous propylene / pentene-1 copolymer, amorphous propylene / octene-1 copolymer and the like, and a melt viscosity at 190 ° C. Is 400 to 9000 cps, preferably 500 to
Those having 5000 cps are preferred.
【０００７】また、ポリブテンとしては、公知のポリブ
テンを用いることができるが、導体への密着性及び水密
性の点から、１００℃における動粘度が５０〜１０００
ｃｐｓ、好ましくは１００〜６００ｃｐｓのものが好適
に用いられる。動粘度は、ＪＩＳ Ｋ ２２８３「原油
および石油製品−動粘度試験方法および粘度指数算出方
法」により測定される。As the polybutene, known polybutene can be used, but from the viewpoint of adhesion to a conductor and water tightness, the kinematic viscosity at 100 ° C. is 50 to 1000.
Cps, preferably 100 to 600 cps, is suitably used. The kinematic viscosity is measured in accordance with JIS K 2283 "Crude oil and petroleum products-Kinematic viscosity test method and viscosity index calculation method".
【０００８】本発明で使用されるテルペン樹脂として
は、公知のものを用いることができるが、導体への密着
性及び水密性の点から、軟化点が１００〜１３０℃、好
ましくは１００〜１１０℃のものが好適に用いられる。As the terpene resin used in the present invention, known resins can be used, but from the viewpoint of adhesion to a conductor and water tightness, the softening point is 100 to 130 ° C, preferably 100 to 110 ° C. Is preferably used.
【０００９】本発明の水密用組成物に配合されるカーボ
ンブラックは、ＢＥＴ法（ＡＳＴＭＤ ３０３７）によ
る比表面積が６００〜１２００ｍ2 ／ｇ、好ましくは８
００〜１１００ｍ2 ／ｇである。カーボンブラックの比
表面積が６００ｍ2 ／ｇ未満である場合には、以下の不
都合が生じる。ケーブル導体の水密用組成物は、導体間
隙に充填されるので、導体直上に被覆される内部半導電
層と同程度の体積抵抗率、即ち１０2 〜１０5 Ω・ｃｍ
とする必要があるが、例えば、比表面積が５０〜４００
ｍ2 ／ｇである、一般に用いられるアセチレンブラッ
ク、チャンネルブラック、ケッチェンブラック、ファー
ネスブラック等のカーボンブラックにて、体積抵抗率を
１０2 〜１０5 Ω・ｃｍとするためには、カーボンブラ
ックを多量に添加する必要がある。多量にカーボンブラ
ックを添加するとコンパウンドが固くなるため、十分な
混練ができず、導体への充填性が悪くなり、また導体へ
の密着性が低下するのである。さらに好ましいカーボン
ブラックは、ＤＢＰ（ジブチルフタレート）吸着量が３
５０〜４００ｍｌ／１００ｇ、特に３６０〜３８０ｍｌ
／１００ｇである。ＤＢＰ吸着量は、ＡＳＴＭ Ｄ ２
４１４により測定される。The carbon black blended in the watertight composition of the present invention has a specific surface area of 600 to 1200 m 2 / g, preferably 8 by BET method (ASTMD 3037).
00 to 1100 m 2 / g. When the specific surface area of carbon black is less than 600 m 2 / g, the following disadvantages occur. Since the watertight composition of the cable conductor is filled in the conductor gap, the volume resistivity is substantially the same as that of the internal semiconductive layer coated immediately above the conductor, that is, 10 2 to 10 5 Ω · cm.
However, for example, the specific surface area is 50 to 400
In order to obtain a volume resistivity of 10 2 to 10 5 Ω · cm with a generally used carbon black such as acetylene black, channel black, Ketjen black, and furnace black, which is m 2 / g, carbon black is used. It is necessary to add a large amount. If a large amount of carbon black is added, the compound becomes hard, so that sufficient kneading cannot be performed, the filling property of the conductor becomes poor, and the adhesion to the conductor decreases. More preferred carbon black has a DBP (dibutyl phthalate) adsorption amount of 3
50-400ml / 100g, especially 360-380ml
/ 100 g. The DBP adsorption amount is ASTM D 2
414.
【００１０】本発明の水密用組成物は、アモルファスポ
リ−α−オレフィンを３０〜６０重量部、好ましくは３
５〜５０重量部、ポリブテンを１０〜６０重量部、好ま
しくは２０〜４０重量部、テルペン樹脂を１０〜４０重
量部、好ましくは２０〜３０重量部、カーボンブラック
を５〜３０重量部、好ましくは１０〜２０重量部のもの
が好適に用いられる。The watertight composition of the present invention comprises 30 to 60 parts by weight, preferably 3 to 60 parts by weight of an amorphous poly-α-olefin.
5 to 50 parts by weight, 10 to 60 parts by weight of polybutene, preferably 20 to 40 parts by weight, 10 to 40 parts by weight of terpene resin, preferably 20 to 30 parts by weight, 5 to 30 parts by weight of carbon black, preferably Those having 10 to 20 parts by weight are suitably used.
【００１１】アモルファスポリ−α−オレフィンが３０
重量部未満、あるいはポリブテンとテルペン樹脂との合
計が７０重量部よりも多い場合は、コンパウンド自体の
凝集性が低下し、高水圧下での水密性に劣るとともに、
べたつき性が増して作業性が悪くなるおそれがある。他
方、アモルファスポリ−α−オレフィンが６０重量部を
越え、あるいはポリブテンとテルペン樹脂との合計が４
０重量部未満の場合は、導体への密着性に劣り、カーボ
ンブラックの分散が悪くなるおそれがある。When the amorphous poly-α-olefin is 30
If less than parts by weight, or if the total of polybutene and terpene resin is more than 70 parts by weight, the cohesiveness of the compound itself is reduced, and the water tightness under high water pressure is inferior,
The stickiness may increase and the workability may deteriorate. On the other hand, the amorphous poly-α-olefin exceeds 60 parts by weight, or the total of polybutene and terpene resin is 4%.
If the amount is less than 0 parts by weight, the adhesion to the conductor is poor, and the dispersion of carbon black may be poor.
【００１２】また、カーボンブラックの配合量が５重量
部未満であると、体積抵抗率が高く不安定となり、３０
重量部を越えると、コンパウンドが固くなり導体への密
着性が低下するおそれがある。If the amount of carbon black is less than 5 parts by weight, the volume resistivity is high and unstable,
If the amount exceeds the weight part, the compound may be hardened and the adhesion to the conductor may be reduced.
【００１３】本発明の水密用組成物は、テープ状に成形
されて、あるいは溶融状態にて使用される。例えば７本
の素線を撚合して７芯の撚線とする撚口ダイスの入口
側、７芯の撚線上に１２本の素線を撚合して電線すると
する撚口ダイスの入口側のそれぞれに、テープ状に成形
された水密用組成物を供給し、各ダイスの入口側に配置
されたガスバーナにより加熱し、テープ状に成形された
水密用組成物を溶融させる。あるいは、ポンプ等を用い
て溶融状態の水密用組成物をダイスの入口側に供給し
て、素線の間隙に充填させることができる。The watertight composition of the present invention is used in the form of a tape or in a molten state. For example, the inlet side of a twisting die in which seven strands are twisted into a 7-core twisted wire, and the inlet side of a twisting die in which 12 strands are twisted on a 7-core twisted wire to form an electric wire. Is supplied with a watertight composition formed into a tape shape, and heated by a gas burner arranged on the inlet side of each die to melt the watertight composition formed into a tape shape. Alternatively, the watertight composition in a molten state can be supplied to the inlet side of the die using a pump or the like, and can be filled in the gaps between the wires.
【００１４】本発明の水密用組成物は、軟化点が１４０
〜１９０℃、特に１５０〜１８０℃が好ましい。本発明
の水密用組成物は、１２０℃前後に加熱するとグリース
状となるので、簡易なグリスポンプで充填することがで
きる。従って、導体間隙に隙間なく充填でき、絶縁被覆
時の導体予熱温度（約１２０℃）でも流動せず、導体に
密着するので、高水圧下でも優れた水密性を有する。The watertight composition of the present invention has a softening point of 140.
To 190 ° C, particularly preferably 150 to 180 ° C. The watertight composition of the present invention becomes grease-like when heated to about 120 ° C, and can be filled with a simple grease pump. Therefore, the gap between the conductors can be filled without gaps, and does not flow even at the conductor preheating temperature (about 120 ° C.) at the time of insulating coating, and adheres tightly to the conductor, so that it has excellent watertightness even under high water pressure.
【００１５】[0015]
【実施例】以下、本発明をさらに詳細に説明するため
に、表１及び表２に記載の実施例及び比較例を示すと共
に、当該実施例、比較例について導体の水密性、導体へ
の密着性の試験を行った。その結果も併せて表１及び表
２に記載する。EXAMPLES In order to explain the present invention in more detail, examples and comparative examples shown in Tables 1 and 2 will be shown. In addition, the water tightness of the conductor and the adhesion to the conductor will be described with respect to the examples and comparative examples. A sex test was performed. The results are also shown in Tables 1 and 2.
【００１６】〔導体の水密性〕サンプル長さ５ｍのもの
（導体素線間に水密用組成物を充填し、導体上を絶縁被
覆した状態のもの）の一端から１０ｋｇ／ｃｍ2 の水圧
で水を注入し、２４時間後に他端からの漏水の有無で合
否を判定した。なお、表中ＡＰＡＯはアモルファスポリ
−α−オレフィンを示し、ＡＰＰはアタクチックポリプ
ロピレンを示す。また、表中の各成分の量は「重量部」
である。[Water tightness of conductor] A sample having a length of 5 m (a state in which a watertight composition is filled between conductor wires and the conductor is insulated and covered) is applied with water pressure of 10 kg / cm 2 from one end. Was injected, and 24 hours later, pass / fail was determined based on the presence or absence of water leakage from the other end. In the table, APAO indicates amorphous poly-α-olefin, and APP indicates atactic polypropylene. The amount of each component in the table is "parts by weight".
It is.
【００１７】〔導体への密着性〕二枚の鋼板（１ｍｍ厚
の圧延銅板）の間にコンパウンドを挟んで密着させ、界
面での剥離及びコンパウンドの凝集性などを観察した。[Adhesion to Conductor] A compound was sandwiched between two steel plates (a rolled copper plate having a thickness of 1 mm) and adhered to each other, and peeling at the interface and cohesion of the compound were observed.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【表２】 [Table 2]
【００２０】 注１：動粘度 at １００℃： ２２０ｃＳｔ 注２： 〃 ： ５９０ｃＳｔ 注３： 〃 ：３７１０ｃＳｔ 注４：軟化点１４０℃ 注５：材料名；アモルファスプロピレン・エチレン共重
合体、軟化点；１２９℃ 注６：材料名；アモルファスプロピレン単独重合体、軟
化点；１４７℃ 注７：Ｂｕｔｙｌ ０６５ 注８：融点：８０℃ 注９：軟化点：１２５℃ 注１０：軟化点：１０５℃ 注１１：アセチレンブラック（比表面積３５０ｍ2 ／
ｇ、ＤＢＰ吸着量３００ｍｌ／１００ｇ） 注１２：ケッチェンブラック（比表面積８００ｍ2 ／
ｇ、ＤＢＰ吸着量３６０ｍｌ／１００ｇ） 注１３：ファーネスブラック（比表面積１０００ｍ2 ／
ｇ、ＤＢＰ吸着量３７０ｍｌ／１００ｇ）Note 1: Kinematic viscosity at 100 ° C .: 220 cSt Note 2: 〃: 590 cSt Note 3: 〃: 3710 cSt Note 4: Softening point 140 ° C. Note 5: Material name: amorphous propylene / ethylene copolymer, softening point; 129 ° C Note 6: Material name; amorphous propylene homopolymer, softening point; 147 ° C Note 7: Butyl 065 Note 8: Melting point: 80 ° C Note 9: Softening point: 125 ° C Note 10: Softening point: 105 ° C Note 11: Acetylene Black (specific surface area 350m 2 /
g, DBP adsorption amount 300 ml / 100 g) Note 12: Ketjen black (specific surface area 800 m 2 /
g, DBP adsorption amount: 360 ml / 100 g) Note 13: Furnace black (specific surface area: 1,000 m 2 / g)
g, DBP adsorption amount 370ml / 100g)
【００２１】[0021]
【発明の効果】本発明の水密用組成物は、比較的簡易な
ポンプで充填可能であり、導体間隙に隙間なく充填で
き、絶縁被覆時の導体予熱温度でも流動せず、導体に密
着するので、高水圧下でも優れた水密性を有する。The watertight composition of the present invention can be filled with a relatively simple pump, can be filled without gaps in the conductor gap, does not flow even at the conductor preheating temperature during insulation coating, and adheres to the conductor. It has excellent watertightness even under high water pressure.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０８Ｌ 93/00 Ｃ０８Ｌ 93/00 Ｃ０９Ｃ 1/50 Ｃ０９Ｃ 1/50 Ｃ０９Ｄ 123/20 Ｃ０９Ｄ 123/20 193/00 193/00 Ｃ０９Ｋ 3/10 Ｃ０９Ｋ 3/10 Ｚ Ｈ０１Ｂ 3/44 Ｈ０１Ｂ 3/44 Ｊ 7/18 7/18 (72)発明者 加藤 寛 兵庫県尼崎市東向島西之町８番地 三菱電 線工業株式会社内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C08L 93/00 C08L 93/00 C09C 1/50 C09C 1/50 C09D 123/20 C09D 123/20 193/00 193/00 C09K 3 / 10 C09K 3/10 Z H01B 3/44 H01B 3/44 J 7/18 7/18 (72) Inventor Hiroshi Kato 8 Nishinocho, Higashimukaijima, Amagasaki City, Hyogo Prefecture Mitsubishi Electric Wire Industry Co., Ltd.
Claims (6)
リブテン及び比表面積が６００〜１２００ｍ2 ／ｇのカ
ーボンブラックを含有するケーブル導体の水密用組成
物。1. A watertight composition for a cable conductor comprising amorphous poly-α-olefin, polybutene and carbon black having a specific surface area of 600 to 1200 m 2 / g.
の水密用組成物。2. The watertight composition according to claim 1, further comprising a terpene resin.
であり、かつ比表面積が９００〜１１００ｍ2 ／ｇであ
る請求項１又は２に記載の水密用組成物。3. The watertight composition according to claim 1, wherein the carbon black is furnace black and has a specific surface area of 900 to 1100 m 2 / g.
吸着量が３５０〜４００ｍｌ／１００ｇである請求項１
〜３のいずれかに記載の水密用組成物。4. The carbon black having an adsorbed amount of dibutyl phthalate of 350 to 400 ml / 100 g.
4. The watertight composition according to any one of items 1 to 3.
モルファスプロピレン単独重合体、アモルファスプロピ
レン・エチレン共重合体、アモルファスプロピレン・ブ
テン−１共重合体から選ばれる少なくとも一種である請
求項１〜４のいずれかに記載の水密用組成物。5. The amorphous poly-α-olefin is at least one selected from the group consisting of an amorphous propylene homopolymer, an amorphous propylene / ethylene copolymer, and an amorphous propylene / butene-1 copolymer. The composition for watertightness according to item 1.
０〜６０重量部、ポリブテンを１０〜６０重量部、テル
ペン樹脂を１０〜４０重量部、カーボンブラックを５〜
３０重量部含有する請求項１〜４のいずれかに記載の水
密用組成物。6. An amorphous poly-α-olefin comprising 3
0-60 parts by weight, polybutene 10-60 parts by weight, terpene resin 10-40 parts by weight, carbon black 5-5
The watertight composition according to any one of claims 1 to 4, comprising 30 parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9133994A JPH10324839A (en) | 1997-05-23 | 1997-05-23 | Composition for watertight sealing of cable conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9133994A JPH10324839A (en) | 1997-05-23 | 1997-05-23 | Composition for watertight sealing of cable conductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10324839A true JPH10324839A (en) | 1998-12-08 |
Family
ID=15117913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9133994A Pending JPH10324839A (en) | 1997-05-23 | 1997-05-23 | Composition for watertight sealing of cable conductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10324839A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005054054A (en) * | 2003-08-04 | 2005-03-03 | Kansai Electric Power Co Inc:The | Olefin-based putty |
| JP2007284688A (en) * | 2007-06-11 | 2007-11-01 | Fujikura Ltd | Semiconductor watertight composition |
| WO2012073303A1 (en) | 2010-11-29 | 2012-06-07 | 株式会社ジェイ・パワーシステムズ | Water blocking electric cable |
| JP2020087798A (en) * | 2018-11-28 | 2020-06-04 | 住友電気工業株式会社 | Power cable |
-
1997
- 1997-05-23 JP JP9133994A patent/JPH10324839A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005054054A (en) * | 2003-08-04 | 2005-03-03 | Kansai Electric Power Co Inc:The | Olefin-based putty |
| JP2007284688A (en) * | 2007-06-11 | 2007-11-01 | Fujikura Ltd | Semiconductor watertight composition |
| JP4708393B2 (en) * | 2007-06-11 | 2011-06-22 | 株式会社フジクラ | Semiconductive watertight composition |
| WO2012073303A1 (en) | 2010-11-29 | 2012-06-07 | 株式会社ジェイ・パワーシステムズ | Water blocking electric cable |
| JP2020087798A (en) * | 2018-11-28 | 2020-06-04 | 住友電気工業株式会社 | Power cable |
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