JPH11213759A - Thin foamed electric wire and manufacture of electric wire - Google Patents
Thin foamed electric wire and manufacture of electric wireInfo
- Publication number
- JPH11213759A JPH11213759A JP10021585A JP2158598A JPH11213759A JP H11213759 A JPH11213759 A JP H11213759A JP 10021585 A JP10021585 A JP 10021585A JP 2158598 A JP2158598 A JP 2158598A JP H11213759 A JPH11213759 A JP H11213759A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- foamed
- polyolefin
- electric wire
- foaming
- 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.)
- Granted
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高速データ通信用
の高発泡した細径絶縁電線、これを用いた多芯ケーブル
及びその製造方法に関する。詳細には、本発明は、高速
データ通信用に適する、導体との密着力に優れ且つ良好
な外観、ばらつきのない低い誘電率を有する高発泡の細
径ポリオレフィン絶縁電線、これを用いた多芯ケーブル
及びその製造方法に関する。The present invention relates to a highly foamed small-diameter insulated wire for high-speed data communication, a multi-core cable using the same, and a method of manufacturing the same. More specifically, the present invention provides a highly foamed, small-diameter polyolefin insulated wire having excellent adhesion to a conductor, good appearance, and low dielectric constant without variation, which is suitable for high-speed data communication. The present invention relates to a cable and a method for manufacturing the cable.
【０００２】[0002]
【従来の技術及び課題】従来、高速データ通信用の発泡
絶縁電線としては、発泡度を高くするために、例えば特
公昭６１−１１４１２号公報にはスエリング比５５％以
上のプラスチック材料を用いて発泡度６０％以上の高発
泡絶縁電線を製造する方法が、また、特公昭６３−５６
６５２号公報には、エチレン−プロピレン弾性共重合
体、高密度ポリエチレン、エチレン−プロピレンブロッ
ク共重合体のブレンドを発泡させて発泡度６０％以上の
高発泡絶縁電線を製造する方法が知られている。即ち、
発泡度を高くするために、このように特定のスエリング
比の材料を用いたり、エチレン−プロピレン共重合体エ
ラストマー等のブレンドを用いたりする方法であるが、
細径発泡絶縁電線を製造する場合に、導体との密着力が
弱くなり、ストリップ長がばらついて端末加工が劣ると
言う欠点がある。これは、導体との密着力は導体と絶縁
体との接触面積が小さければ小さい程弱くなるため、細
径絶縁電線で細い導体を使用して発泡度を高くすると密
着力は著しく弱くなるからである。2. Description of the Related Art Conventionally, as a foamed insulated wire for high-speed data communication, for example, Japanese Patent Publication No. 61-11412 discloses a foamed insulated wire using a plastic material having a swelling ratio of 55% or more in order to increase the foaming degree. A method of producing a highly foamed insulated wire having a degree of 60% or more is disclosed in Japanese Patent Publication No. 63-56.
No. 652 discloses a method for producing a highly foamed insulated wire having a foaming degree of 60% or more by foaming a blend of an ethylene-propylene elastic copolymer, a high-density polyethylene, and an ethylene-propylene block copolymer. . That is,
In order to increase the degree of foaming, such a method of using a material having a specific swelling ratio, or a method of using a blend of an ethylene-propylene copolymer elastomer or the like,
In the case of manufacturing a small-diameter foamed insulated wire, there is a disadvantage that the adhesion to the conductor is weakened, the strip length varies, and the terminal processing is inferior. This is because the smaller the contact area between the conductor and the insulator, the weaker the adhesive strength between the conductor and the conductor. is there.
【０００３】また、導体との密着力を上げるために、特
公昭４８−４２３１４号公報には、心線上に薄肉の非発
泡（充実）絶縁被覆を施した後、ポリエチレン発泡絶縁
層を被覆する薄肉発泡絶縁電線の製造方法が知られてい
るが、良好な外観で高発泡の細径発泡電線を得ることが
困難である。これは、導体上に薄肉の非発泡絶縁被覆を
設けると、発泡層の肉厚は薄くせざるを得なくなり、必
要な発泡度は高くなるために、より薄肉、高発泡の押出
が必要になり、細径の高発泡電線を得ることは困難にな
るからである。Japanese Patent Publication No. 48-42314 discloses a thin non-foamed (enriched) insulating coating on a core wire and then a polyethylene foamed insulating layer to improve the adhesion to a conductor. Although a method for producing a foamed insulated wire is known, it is difficult to obtain a thin foamed wire having good appearance and high foaming. This is because if a thin non-foamed insulation coating is provided on the conductor, the foamed layer must be thinned, and the required degree of foaming increases, so a thinner, highly foamed extrusion is required. This is because it becomes difficult to obtain a small-diameter highly foamed electric wire.
【０００４】更に、特公平６−１６３７１号公報には、
発泡絶縁押出によって発泡絶縁電線を製造する際に、導
体が押出機に入る前に導体を冷却して、導体と絶縁体と
の密着力を上げる方法が知られているが、細径発泡絶縁
電線を製造しようとすると、必要な発泡度が得られな
い。この方法も導体周りの絶縁体を急冷して発泡を抑
え、導体との密着力を上げるので、従来法の充実非発泡
層を設ける場合と同じく、導体周りで発泡していない分
を発泡層で補わなければならないため、細径薄肉高発泡
の絶縁電線を得るのは困難である。Further, Japanese Patent Publication No. 6-16371 discloses that
When manufacturing a foamed insulated wire by foaming insulated extrusion, a method is known in which the conductor is cooled before the conductor enters the extruder to increase the adhesion between the conductor and the insulator. When attempting to produce, the required degree of foaming cannot be obtained. In this method, too, the insulator around the conductor is quenched to suppress foaming and increase the adhesion to the conductor. It is difficult to obtain a thin, thin, highly foamed insulated wire because it must be supplemented.
【０００５】[0005]
【課題を解決するための手段】本発明者は上記の課題に
ついて種々検討した結果、スエリング比が５５％以上の
ポリオレフィン、特にカルボン酸又はカルボン酸無水物
基含有共単量体を含む共重合体の部分金属塩を１０重量
％以上含有するポリオレフィンを導体上に高発泡に押出
発泡して発泡絶縁層を形成することにより、特に高速デ
ータ通信用に適する、導体との密着力に優れた且つ良好
な外観、ばらつきのない誘電率を有する細径で且つ高発
泡のポリオレフィン絶縁電線を提供できることを見出
し、本発明を完成するに至った。As a result of various studies on the above problems, the present inventor has found that a copolymer containing a polyolefin having a swelling ratio of 55% or more, especially a carboxylic acid or carboxylic acid anhydride group-containing comonomer. By extruding a polyolefin containing 10% by weight or more of a partial metal salt on a conductor to high foaming to form a foamed insulating layer, it is particularly suitable for high-speed data communication and has excellent and good adhesion to a conductor. The present inventors have found that it is possible to provide a small-diameter and highly foamed polyolefin insulated wire having an excellent appearance and a uniform dielectric constant, and have completed the present invention.
【０００６】即ち、本発明は： (1) 導体径０．４ｍｍφ以下、絶縁被覆厚０．８ｍｍ以
下の発泡ポリオレフィン絶縁電線であって、 等価誘電率が１．６より小さい、 等価誘電率のばらつきが±０．１以内であり、 導体引抜力が１００ｇ／５０ｍｍ以上である の３つの要件を兼備する、発泡ポリオレフィン絶縁電線
を提供する。また、(2) 化学発泡剤及び／又は不活性
気体発泡剤を用いて、スエリング比が５５％以上のポリ
オレフィンを発泡度５０％以上に押出発泡して導体上に
発泡絶縁層を形成する、(1) 記載の発泡ポリオレフィン
絶縁電線の製造方法を提供する。また、(3) ポリオレ
フィンとしてカルボン酸又はカルボン酸無水物基含有共
単量体を含む共重合体の部分金属塩を１０重量％以上含
有するポリオレフィンを使用する点にも特徴を有する。That is, the present invention provides: (1) A foamed polyolefin insulated wire having a conductor diameter of 0.4 mm or less and an insulation coating thickness of 0.8 mm or less, having an equivalent permittivity of less than 1.6, and a variation in equivalent permittivity. Is within ± 0.1, and the conductor withdrawal force is 100 g / 50 mm or more. (2) Forming a foamed insulating layer on a conductor by extruding a polyolefin having a swelling ratio of 55% or more to a foaming degree of 50% or more by using a chemical blowing agent and / or an inert gas blowing agent; 1) A method for producing the foamed polyolefin insulated wire described above. Another feature is that (3) a polyolefin containing 10% by weight or more of a partial metal salt of a copolymer containing a carboxylic acid or a carboxylic acid anhydride group-containing comonomer is used as the polyolefin.
【０００７】以下、本発明を詳細に説明する。 （A) (i) 本発明の背景技術についてコンピュータのデ
ータ通信などに利用されるケーブルは配線スペースの問
題等から細径化が進んでいる。また、データ通信速度は
絶縁体の誘電率の平方根に反比例することから、絶縁体
の誘電率を下げるために発泡した絶縁体が用いられ、発
泡度は高いほど伝送速度が速くなる。従来の外径が太く
発泡度も低い発泡電線を製造する場合は、導体と絶縁体
の接触面積が大きいため、比較的容易に導体と発泡絶縁
層を密着させることが出来る。Hereinafter, the present invention will be described in detail. (A) (i) Background Art of the Present Invention Cables used for data communication of computers and the like have been reduced in diameter due to problems such as wiring space. Further, since the data communication speed is inversely proportional to the square root of the dielectric constant of the insulator, a foamed insulator is used to reduce the dielectric constant of the insulator. The higher the foaming degree, the higher the transmission speed. When a conventional foamed electric wire having a large outer diameter and a low foaming degree is manufactured, the contact area between the conductor and the insulator is large, so that the conductor and the foamed insulating layer can be relatively easily brought into close contact with each other.
【０００８】一方、導体径が細くなり発泡度が高くなる
と、発泡層と導体との接触面積が小さくなるため、導体
と絶縁層とを密着させることは非常に困難になる。導体
と発泡層との密着力が弱いと電線を切断した時に導体が
突出したり、ストリップした時にストリップ長がばらつ
くという問題が生じる。特に導体外径が０．４ｍｍより
小さく発泡度が５０％以上の発泡絶縁電線を製造する際
にはこの問題が顕著になる。さらに、発泡絶縁層の外径
が小さいと良好な押出外観を得ることが非常に難しくな
る。発泡絶縁層の厚みが０．８ｍｍより小さいと発泡絶
縁層の外観が荒れてしまうことが多い。On the other hand, when the diameter of the conductor is reduced and the degree of foaming is increased, the contact area between the foamed layer and the conductor is reduced, so that it is very difficult to bring the conductor and the insulating layer into close contact with each other. If the adhesion between the conductor and the foam layer is weak, there is a problem that the conductor protrudes when the electric wire is cut, or the strip length varies when the electric wire is stripped. In particular, this problem becomes remarkable when manufacturing a foamed insulated wire having a conductor outer diameter of less than 0.4 mm and a degree of foaming of 50% or more. Further, when the outer diameter of the foamed insulating layer is small, it is very difficult to obtain a good extruded appearance. If the thickness of the foamed insulating layer is smaller than 0.8 mm, the appearance of the foamed insulating layer often becomes rough.
【０００９】(ii)本発明の特徴：本発明の特徴は、この
ような細径で高発泡の絶縁電線を製造する際に、スエリ
ング比が５５％以上のポリオレフィン、特に三井デュポ
ンポリケミカル社製のアイオノマー樹脂である、カルボ
ン酸又はカルボン酸無水物基含有共単量体を含む共重合
体の部分金属塩を１０重量％以上含有するポリオレフィ
ンを発泡層に用いることにより、導体との密着性に優れ
且つ良好な外観、ばらつきのない低い誘電率を有する高
発泡の細径ポリオレフィン絶縁電線及びその製造方法を
提供する。また、本発明では、細径の導体上に高発泡度
の発泡層を形成しても、導体との密着力が維持できるた
め端末加工時にストリップ長のばらつきなく加工できる
利点がある。(Ii) Features of the present invention: A feature of the present invention is that when producing such a small-diameter and highly foamed insulated wire, a polyolefin having a swelling ratio of 55% or more, particularly manufactured by Mitsui Dupont Polychemical Co., Ltd. By using a polyolefin containing 10% by weight or more of a partial metal salt of a copolymer containing a carboxylic acid or a carboxylic acid anhydride group-containing comonomer, which is an ionomer resin, in the foamed layer, the adhesion to the conductor is improved. Provided is a highly foamed small-diameter polyolefin insulated wire having an excellent and good appearance and a low dielectric constant without variation, and a method for producing the same. Further, in the present invention, even when a foamed layer having a high degree of foaming is formed on a small-diameter conductor, there is an advantage that the processing can be performed without variation in the strip length at the time of terminal processing because the adhesion to the conductor can be maintained.
【００１０】(B) 発泡用ポリオレフィン材料： (i) 発泡絶縁層を構成するプラスチック材：本発明の発
泡絶縁層を構成するプラスチック材としては、スエリン
グ比が５５％以上、好ましくは６０％以上のポリオレフ
ィンを使用することが必須である。この場合、ポリオレ
フィンのスエリング比の上限についてはその目的を達成
するなら特に制限されないが、スエリング比は高いほど
気泡径の小さい良好な外観の発泡電線が得られるので好
ましく、一般には６５％程度のスエリング比を有すれば
良い。また、スエリング比が５５％未満では気泡径が大
きくなり易く、良好な外観の発泡電線を得られなくなる
ので好ましくない。ここで言うスエリング比（％）と
は、ＪＩＳ−Ｅ６７６０に又はＡＳＴＭ−Ｄ１２３８−
７０等に規定されたメルトインデクサーによりメルトイ
ンデックス（ＭＩ）を測定する際（測定温度１９００
Ｃ、荷重２１６０ｇ）に得られる押出物の外径をｄｓと
し、メルトインデクサーにセットされているオリフイス
の内径をｄ0 とした時に、下式(1) で表される。(B) Polyolefin material for foaming: (i) Plastic material constituting foamed insulating layer: The plastic material constituting foamed insulating layer of the present invention has a swelling ratio of 55% or more, preferably 60% or more. It is essential to use a polyolefin. In this case, the upper limit of the swelling ratio of the polyolefin is not particularly limited as long as the object is achieved. However, a higher swelling ratio is preferable because a foamed electric wire having a small cell diameter and a good appearance can be obtained, and generally a swelling ratio of about 65% is preferable. What is necessary is to have a ratio. On the other hand, if the swelling ratio is less than 55%, the cell diameter tends to increase, and a foamed electric wire having a good appearance cannot be obtained. The swelling ratio (%) mentioned here is defined in JIS-E6760 or ASTM-D1238-
When measuring the melt index (MI) using a melt indexer specified in 70 or the like (measurement temperature 1900
C, and the outer diameter of the extrudate obtained load 2160 g) and ds, the inner diameter of the orifice set in the melt indexer when the d 0, represented by the following formula (1).
【数１】 （注）ｄｓ、ｄ0 ；常温での測定値。発泡剤を含む樹脂
をメルトインデクサーで押出すと発泡剤が発泡してしま
うため、本発明におけるスエリング比はすべて発泡剤を
含まないベース樹脂のブレンド物について測定したもの
である。(Equation 1) (Note) ds, d 0; measured at room temperature. When a resin containing a foaming agent is extruded with a melt indexer, the foaming agent foams. Therefore, the swelling ratio in the present invention is all measured for a blend of a base resin containing no foaming agent.
【００１１】(ii)アイオノマー：本発明で発泡層に使用
するポリオレフィンとしては、アイオノマーを１０重量
％以上、好ましくは２０重量％以上含有するポリオレフ
ィンが望ましい。ポリオレフィン中のアイオノマー含有
量が１０重量％未満では導体との密着力が不十分となり
好ましくない。ここで言うアイオノマーとは、カルボン
酸又はカルボン酸無水物基含有共単量体を含む共重合体
の部分金属塩を指し、代表的にはエチレンとカルボン酸
又はカルボン酸無水物、特にα，β不飽和カルボン酸又
はそのカルボン酸無水物との共重合体の部分金属塩であ
り、例えば特公昭３９−６８１０号公報に記載される方
法によって製造できる。(Ii) Ionomer: As the polyolefin used in the foamed layer in the present invention, a polyolefin containing 10% by weight or more, preferably 20% by weight or more of an ionomer is desirable. If the ionomer content in the polyolefin is less than 10% by weight, the adhesion to the conductor is insufficient, which is not preferable. The term “ionomer” as used herein refers to a partial metal salt of a copolymer containing a carboxylic acid or a carboxylic acid anhydride group-containing comonomer, typically ethylene and a carboxylic acid or a carboxylic acid anhydride, particularly α, β. It is a partial metal salt of an unsaturated carboxylic acid or a copolymer thereof with a carboxylic anhydride, and can be produced, for example, by the method described in JP-B-39-6810.
【００１２】その具体例としては、エチレンとアクリル
酸、メタクリル酸、エタクリル酸、イタコン酸、フマル
酸等の炭素数３〜８のα，β不飽和カルボン酸又はその
カルボン酸無水物との共重合体；またはこれに更にアク
リル酸メチル、アクリル酸エチル、アクリル酸イソブチ
ル、アクリル酸ｎブチル、メタクリル酸メチル、メタク
リル酸エチル、メタクリル酸ｎブチル、メタクリル酸イ
ソブチル、フマル酸ジメチル等の炭素数４〜８のα，β
不飽和カルボン酸エステルを第３成分として含有する３
元共重合体中のカルボン酸又はその無水物基の一部又は
全部を金属イオン架橋させたものである。Specific examples thereof include copolymerization of ethylene with an α, β unsaturated carboxylic acid having 3 to 8 carbon atoms such as acrylic acid, methacrylic acid, ethacrylic acid, itaconic acid, fumaric acid or a carboxylic anhydride thereof. Or C4 to C8 such as methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, and dimethyl fumarate; Α, β
3 containing an unsaturated carboxylic acid ester as a third component
The carboxylic acid or its anhydride group in the original copolymer is partially or entirely crosslinked with metal ions.
【００１３】この共重合体の部分金属塩は、その１種又
は２種以上を混合して用いても良い。このように、上記
共重合体の部分金属塩は、特にエチレンと炭素数３〜８
のα，β不飽和カルボン酸又はそのカルボン酸無水物と
の共重合体の分子間が金属イオンで架橋された構造を有
するものである。好ましくはエチレンとアクリル酸及び
／又はメタクリル酸の共重合体の亜鉛、ナトリウム、カ
リウム、マグネシウムの部分金属塩である。該共重合体
の部分金属塩のＭＦＲは、約０．１〜５００、好ましく
は約１〜１００である。共重合体の部分金属塩のＭＦＲ
が約０．１未満では成形性が不良となり、逆に５００を
超えると発泡層の強度が不足する。The partial metal salt of the copolymer may be used alone or in combination of two or more. As described above, the partial metal salt of the above copolymer is particularly composed of ethylene and C3 to C8.
Having a structure in which intermolecular molecules of a copolymer of α and β unsaturated carboxylic acids or carboxylic anhydrides thereof are crosslinked with metal ions. Preferred are zinc, sodium, potassium and magnesium partial metal salts of a copolymer of ethylene and acrylic acid and / or methacrylic acid. The MFR of the partial metal salt of the copolymer is about 0.1 to 500, preferably about 1 to 100. MFR of partial metal salt of copolymer
If it is less than about 0.1, the moldability will be poor, and if it exceeds 500, the strength of the foamed layer will be insufficient.
【００１４】共重合体中のカルボン酸又はカルボン酸無
水物成分の含有量は、一般に約０．５〜１５モル％、好
ましくは約１〜６モル％である。共重合体中のカルボン
酸又はカルボン酸無水物成分の含有量が約０．５％未満
では導体との密着力が不足し、また１５モル％を超えて
含有すると発泡絶縁被覆の強度が不足するので好ましく
ない。更に、第３成分としてα，β不飽和カルボン酸エ
ステルを含有させても良く、そのエステルの含有量は、
一般に約０．２〜１５モル、好ましくは約１〜１０モル
％である。[0014] The content of the carboxylic acid or carboxylic anhydride component in the copolymer is generally about 0.5 to 15 mol%, preferably about 1 to 6 mol%. When the content of the carboxylic acid or carboxylic anhydride component in the copolymer is less than about 0.5%, the adhesion to the conductor is insufficient, and when the content exceeds 15 mol%, the strength of the foam insulating coating is insufficient. It is not preferable. Further, an α, β unsaturated carboxylic acid ester may be contained as the third component, and the content of the ester is as follows.
Generally, it is about 0.2 to 15 mol%, preferably about 1 to 10 mol%.
【００１５】金属イオン架橋に使用される金属イオンと
しては、リチウム、ナトリウム、カリウム、セシウム等
の１価金属イオン；マグネシウム、カルシウム、ストロ
ンチウム、バリウム、銅、亜鉛等の２価金属イオンまた
はアルミニウム、鉄等の３価金属イオンが挙げられる。
特に、金属イオンとして亜鉛イオン、ナトリウムイオン
を用いたものは、低吸湿性であるために電気特性の変化
が少なく好ましい。金属化合物の形で用いられる金属イ
オンは、上記共重合体中の酸の含量、１９０℃及び２１
５０ｇ荷重におけるＭＦＲ（メルトフローレート、ｇ／
１０分）等によってその添加量が変化するが、一般には
約１０％以上、好ましくは約１５〜８０％のカルボン酸
又はその無水物基を中和する量で用いられる。The metal ions used for the metal ion crosslinking include monovalent metal ions such as lithium, sodium, potassium and cesium; divalent metal ions such as magnesium, calcium, strontium, barium, copper and zinc; or aluminum, iron and the like. And the like.
In particular, those using zinc ions and sodium ions as metal ions are preferable because they have low hygroscopicity and thus have little change in electrical characteristics. The metal ion used in the form of the metal compound is determined by the content of the acid in the above copolymer, 190 ° C.
MFR (melt flow rate, g /
10 minutes), the amount of the carboxylic acid or its anhydride group is neutralized by about 10% or more, preferably about 15 to 80%.
【００１６】(iii) アイオノマーとブレンドできるポリ
オレフィン：発泡層に用いるアイオノマーとブレンドす
るポリオレフィン樹脂としては、ポリエチレン、ポリプ
ロピレン、エチレンーαオレフイン共重合体、エチレン
−酢酸ビニル共重合体、エチレン−アクリル酸エチル共
重合体、エチレン−アクリル酸メチル共重合体、エチレ
ンープロピレンゴムなどが挙げられる。この中、ポリエ
チレンとしては低密度ポリエチレン、高密度ポリエチレ
ン、直鎖状低密度ポリエチレン、超低密度ポリエチレン
のいずれでも良い。ポリプロピレンとしてはポリプロピ
レンホモポリマーの他にエチレンとのブロックコポリマ
ーやランダムコポリマーを用いても良い。これらのポリ
オレフィン樹脂は誘電率が小さい方が電気特性が良くな
るので好ましいが、アイオノマーとブレンドしてスエリ
ング比が５５％以上あれば特に制限されない。該ポリオ
レフィンのＭＦＲはアイオノマーと十分にブレンドでき
て発泡成形できれば特に制限されないが、通常０．１〜
２０を用いるのが望ましい。(Iii) Polyolefin Blended with Ionomer: Polyolefin resins blended with the ionomer used in the foamed layer include polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer. Polymers, ethylene-methyl acrylate copolymers, ethylene-propylene rubber and the like can be mentioned. Among them, polyethylene may be any of low-density polyethylene, high-density polyethylene, linear low-density polyethylene, and ultra-low-density polyethylene. As the polypropylene, a block copolymer or a random copolymer with ethylene may be used in addition to the polypropylene homopolymer. These polyolefin resins are preferred to have a small dielectric constant since electric characteristics are improved, but are not particularly limited as long as they are blended with an ionomer and have a swelling ratio of 55% or more. Although the MFR of the polyolefin is not particularly limited as long as it can be sufficiently blended with the ionomer and foamed, it is usually 0.1 to 0.1%.
It is desirable to use 20.
【００１７】（iv) 添加剤：本発明の発泡絶縁材料に
は、必要に応じて種々の添加剤を配合しても良い。該添
加剤としては、酸化防止剤、光安定剤、紫外線防止剤、
帯電防止剤、滑剤、有機又は無機の充填剤、金属不活性
化剤、発泡助剤、核剤、染顔料、架橋剤、架橋助剤等を
挙げることができる。(Iv) Additives: The foamed insulating material of the present invention may optionally contain various additives. As the additives, antioxidants, light stabilizers, ultraviolet inhibitors,
Examples thereof include an antistatic agent, a lubricant, an organic or inorganic filler, a metal deactivator, a foaming aid, a nucleating agent, a dye / pigment, a crosslinking agent, and a crosslinking aid.
【００１８】(C) 発泡押出成形：(i) 上記スエリング比
５５％以上のポリオレフィン材料を押出機に装填して導
体径０．４ｍｍφ以下の導体上に、発泡絶縁被覆厚０．
８ｍｍ以下となるように発泡度５０％以上に発泡押出被
覆して、 等価誘電率が１．６より小さく、 等価
誘電率のばらつきが±０．１以内であり、 導体引抜
力が１００ｇ／５０ｍｍ以上である、の３つの要件を兼
備するように、細径の高発泡ポリオレフィン絶縁電線と
する必要がある。上記ポリオレフィン材料は、予め単軸
又は多軸押出機、バンバリーミキサーを用いて混練して
均一配合物にすることが望ましい。(C) Foam extrusion molding: (i) A polyolefin material having a swelling ratio of 55% or more is charged into an extruder and a foam insulating coating having a thickness of 0.4 mm or less is formed on a conductor having a conductor diameter of 0.4 mm or less.
Foam extrusion coating to a foaming degree of 50% or more so as to be 8 mm or less, equivalent dielectric constant is less than 1.6, variation of equivalent dielectric constant is within ± 0.1, and conductor pull-out force is 100 g / 50 mm or more It is necessary to use a small-diameter, highly-foamed polyolefin insulated wire so as to satisfy the three requirements. It is desirable that the above-mentioned polyolefin material is previously kneaded using a single-screw or multi-screw extruder or a Banbury mixer to obtain a uniform blend.
【００１９】(ii)発泡ポリオレフィン絶縁電線の導体径
と発泡絶縁厚 本発明では、このような特定のスエリング比を有するポ
リオレフィン材料を用いて高発泡させたので、導体径
０．４ｍｍφ以下の細径導体上に、発泡絶縁被覆厚０．
８ｍｍ以下に押出被覆することができる。特に、導体径
０．２ｍｍφ、発泡絶縁被覆厚０．１５ｍｍといった細
径電線でも良好な発泡状態で、導体密着に優れた電線を
押出被覆することができる。この場合、導体径の下限に
ついては一定の電線強度が得られるなら特に制限されな
いが、通常０．１ｍｍφ程度までなら一定の導体引抜力
が得られる。また、発泡絶縁層の厚みの下限は、均一な
一定の等価誘電率と一定の導体引抜力が得られるなら特
に制限されないが、通常０．１ｍｍ程度までなら良好な
発泡状態で押出が可能である。(Ii) Conductor Diameter and Foam Insulation Thickness of Foamed Polyolefin Insulated Wire In the present invention, since the polyolefin material having such a specific swelling ratio is highly foamed, the conductor diameter is 0.4 mmφ or less. On the conductor, foam insulation coating thickness 0.
It can be extrusion coated to 8 mm or less. In particular, even a fine wire having a conductor diameter of 0.2 mmφ and a foam insulation coating thickness of 0.15 mm can extrude and coat a wire excellent in conductor adhesion in a good foaming state. In this case, the lower limit of the conductor diameter is not particularly limited as long as a constant electric wire strength can be obtained, but a constant conductor pulling force is usually obtained up to about 0.1 mmφ. Further, the lower limit of the thickness of the foamed insulating layer is not particularly limited as long as a uniform constant equivalent dielectric constant and a constant conductor pull-out force can be obtained. .
【００２０】(iii) 発泡押出： １）発泡押出は、化学発泡剤（分解型発泡剤）又は物理
発泡剤（蒸発型発泡剤）を練り込んだ発泡ポリオレフィ
ン絶縁材料を押出機に装填して導体上に、一般に溶融押
出温度１３０〜２５０℃で、発泡度５０％以上、好まし
くは６０％以上で発泡押出することにより行われる。発
泡度が５０％未満では等価誘電率が大きくなってしま
い、信号の伝送速度が遅くなる。また、発泡度の上限は
特に制限されないが、通常８５％を越えると十分な引抜
力を得ることが難しくなる。押出温度が１３０℃未満で
はポリオレフィン材料が十分に溶融せず、良好な外観で
押出できないし、また２５０℃を超えると材料が焼けて
しまい望ましくない。(Iii) Foaming Extrusion: 1) In foaming extrusion, a foamed polyolefin insulating material into which a chemical foaming agent (decomposition type foaming agent) or a physical foaming agent (evaporation type foaming agent) has been kneaded is loaded into an extruder and the conductor is extruded. The above is generally carried out by foam extrusion at a melt extrusion temperature of 130 to 250 ° C. and a foaming degree of 50% or more, preferably 60% or more. If the degree of foaming is less than 50%, the equivalent dielectric constant increases, and the signal transmission speed decreases. The upper limit of the degree of foaming is not particularly limited, but if it exceeds 85%, it becomes difficult to obtain a sufficient drawing force. If the extrusion temperature is lower than 130 ° C., the polyolefin material does not melt sufficiently and cannot be extruded with a good appearance, and if it exceeds 250 ° C., the material burns, which is not desirable.
【００２１】２）化学発泡発泡剤としては、例えばアゾ
ジカルボンアミドおよびその金属塩、４，４’−オキシ
ビス（ベンゼンスルホニルヒドラジド）、各種金属の炭
酸塩、ジニトロソペンタメチレンテトラミン、トルエン
スルホニルヒドラジド等を挙げることができ、特にアゾ
ジカルボンアミドの使用が好ましい。物理発泡剤として
は、窒素、アルゴン、炭酸ガス、メタン、プロパン、ブ
タン、ペンタン、ヘキサン、フルオロカーボン等を挙げ
ることができ、特に窒素の使用が好ましい。2) Chemical foaming agents include, for example, azodicarbonamide and its metal salts, 4,4'-oxybis (benzenesulfonylhydrazide), carbonates of various metals, dinitrosopentamethylenetetramine, toluenesulfonylhydrazide and the like. The use of azodicarbonamide is particularly preferred. Examples of the physical foaming agent include nitrogen, argon, carbon dioxide, methane, propane, butane, pentane, hexane, and fluorocarbon, and the use of nitrogen is particularly preferable.
【００２２】３）本発明では、これらの発泡剤をポリオ
レフィン樹脂材料に練り込んだものを押出発泡を行う
が、ベース樹脂全体にこれらの発泡剤を練り込んでも良
いし、予め樹脂の一部に高濃度で発泡剤を練り込んだマ
スターバッチを作っておき、これをベース樹脂とドライ
ブレンドして押出しても良い。 ４）発泡度は発泡電線１ｍ当たりの静電容量から式(2)
により求めた。3) In the present invention, a mixture obtained by kneading these foaming agents into a polyolefin resin material is subjected to extrusion foaming. However, these foaming agents may be kneaded into the entire base resin, or a part of the resin may be added in advance. A masterbatch in which a foaming agent is kneaded at a high concentration may be prepared, and the masterbatch may be dry-blended with the base resin and extruded. 4) The degree of foaming is calculated from the capacitance per meter of foamed wire by the formula (2)
Determined by
【数２】 〔上式で、Εｓ＝Ｃｓ×ｌｏｇ（ｄ2 ／ｄ1 ）／２４．１３・・・ (3) Εｓ：等価誘電率 Εｏ：発泡前の絶縁材料の比誘電率 Ｃｓ：発泡電線の静電容量（ｐＦ／ｍ） ｄ1 ：導体外径（ｍｍ） ｄ2 ：発泡電線の外径（ｍｍ）〕(Equation 2) [In the above equation, Δs = Cs × log (d 2 / d 1 ) /24.13 (3) Δs: equivalent dielectric constant Δo: relative dielectric constant of the insulating material before foaming Cs: static electricity of the foamed electric wire capacity (pF / m) d 1: conductor outer diameter (mm) d 2: the outer diameter of the foamed wire (mm)]
【００２３】また、発泡層の外側に発泡剤を含まない非
発泡層を設けても良い。さらに、この発泡電線２本を撚
り合わせてツイストペアケーブルとしたり、複数本を含
む多芯ケーブルとしたり、平行にならべたテープ状電線
とすることもできる。さらに、この電線に予め架橋剤を
配合して行う化学架橋しても或いは電子線などの放射線
を照射して架橋しても良いｏA non-foamed layer containing no foaming agent may be provided outside the foamed layer. Further, the two foamed electric wires may be twisted to form a twisted pair cable, a multi-core cable including a plurality of the electric wires, or a parallel tape-shaped electric wire. Further, the electric wire may be chemically cross-linked by blending a cross-linking agent in advance, or may be cross-linked by irradiation with radiation such as an electron beam.
【００２４】(D) 発泡ポリオレフィン絶縁電線：本発明
の発泡ポリオレフィン絶縁電線は、上記の方法で製造さ
れるが、導体径０．４ｍｍφ以下、絶縁被覆厚０．８ｍ
ｍ以下であって、且つ 等価誘電率が１．６より小さ
く、 等価誘電率のばらつきが±０．１以内であり、
導体引抜力が１００ｇ／５０ｍｍ以上である３つの
要件を兼備する必要がある。 等価誘電率は１．６より小さく、好ましくは１．５
より小さく、より好ましくは１．２〜１．４である。 等価誘電率のばらつきが±０．１以内と、ばらつき
が殆どないことが必要である。(D) Foamed polyolefin insulated wire: The foamed polyolefin insulated wire of the present invention is produced by the above-described method, and has a conductor diameter of 0.4 mmφ or less and an insulation coating thickness of 0.8 m.
m, the equivalent permittivity is smaller than 1.6, and the variation of the equivalent permittivity is within ± 0.1,
It is necessary to satisfy three requirements that the conductor pull-out force is 100 g / 50 mm or more. The equivalent permittivity is less than 1.6, preferably 1.5
It is smaller, more preferably 1.2 to 1.4. It is necessary that the variation of the equivalent dielectric constant is within ± 0.1 and that there is almost no variation.
【００２５】 本発明により得られた発泡ポリオレフ
ィン絶縁電線は、導体引抜力が１００ｇ／５０ｍｍ以
上、好ましくは２００ｇ／５０ｍｍ以上であることが必
要である。上記の場合、等価誘電率が１．６以上と高い
と信号の伝送速度が遅くなり好ましくなく、またその際
に等価誘電率のばらつきが±０．１以上と多いと伝送特
性が不安定となる欠点がある。更に、導体引抜力が１０
０ｇ／５０ｍｍ未満であると、電線を切断した時に導体
が突出したり、被覆をストリップした時にストリップ長
がばらつくという問題がある。この導体引抜力の上限は
このような特性の細径の発泡ポリオレフィン絶縁電線が
得られるなら特に制限されないが、通常２００ｇ／５０
ｍｍあれば十分である。The foamed polyolefin insulated wire obtained by the present invention needs to have a conductor pulling force of 100 g / 50 mm or more, preferably 200 g / 50 mm or more. In the above case, if the equivalent dielectric constant is as high as 1.6 or more, the signal transmission speed becomes slow, which is not preferable, and if the variation in the equivalent dielectric constant is as large as ± 0.1 or more, the transmission characteristics become unstable. There are drawbacks. Furthermore, the conductor pull-out force is 10
If it is less than 0 g / 50 mm, there is a problem that the conductor protrudes when the electric wire is cut or the strip length varies when the coating is stripped. The upper limit of the conductor pull-out force is not particularly limited as long as a thin-diameter foamed polyolefin insulated wire having such characteristics can be obtained, but is usually 200 g / 50.
mm is sufficient.
【００２６】[0026]
【実施例】本発明は下記の実施例及び比較例により説明
されるが、これらは本発明の範囲を制限しない。 ＜導体密着力の測定＞ここで導体密着力は、図１に説明
するように、電線端末５０ｍｍを残して被覆（絶縁体）
３を剥がし、導体１を導体径より若干大きい径の治具２
に通して、引っ張った時の力を測定して得られた値
（ｇ）である。＜等価誘電率の計算＞等価誘電率とは電
線外径、導体径、静電容量から先の(3) 式により計算し
たものを指す。The present invention is illustrated by the following examples and comparative examples, which do not limit the scope of the invention. <Measurement of Conductor Adhesion Force> Here, as shown in FIG.
3. A jig 2 having a diameter slightly larger than the conductor diameter
And the force (g) obtained by measuring the force when pulled. <Calculation of Equivalent Permittivity> The equivalent permittivity indicates a value calculated from the outer diameter of the electric wire, the conductor diameter, and the capacitance by the above equation (3).
【００２７】（実施例１）ＭＩ＝１．５、融点９１℃で
亜鉛イオンを金属イオンとして含むアイオノマー（エチ
レン−メタクリル酸共重合体、；三井デュポンポリケミ
カル社製の商品名「ハイミラン１６５０」）とＭＩ＝
０．８の密度＝０．９５３の高密度ポリエチレン（三井
石油化学社製の商品名「ハイゼックス５３０５Ｅ」）及
びアゾジカルポンアミドを５０：５０：２の割合でブレ
ンドし、二軸押出機（池貝鉄工社製の商品名「ＰＣＭ−
３０」）で溶融混合し、ベレットを作製した．この樹脂
材料を外径０・２ｍｍφの銅線上に肉厚０．１５ｍｍの
発泡度７０％の発泡電線を押出成形した。電線表面の外
観は良好で、導体密着力も４００ｇあり、十分な密着力
であった。なお、アイオノマーと高密度ポリエチレンの
５０：５０のブレンド物のスエリング比は７０％であっ
た。Example 1 An ionomer containing zinc ion as a metal ion at MI = 1.5 and a melting point of 91 ° C. (ethylene-methacrylic acid copolymer; trade name “Himilan 1650” manufactured by DuPont-Mitsui Polychemicals) And MI =
A high-density polyethylene having a density of 0.8 = 0.953 (trade name “HIZEX 5305E” manufactured by Mitsui Petrochemical Co., Ltd.) and azodicarponamide are blended at a ratio of 50: 50: 2, and a twin-screw extruder (Ikegai) Product name "PCM-"
30 ") to produce a bellet. From this resin material, a foamed electric wire having a foaming degree of 70% and a thickness of 0.15 mm was extruded on a copper wire having an outer diameter of 0.2 mmφ. The appearance of the electric wire surface was good, and the conductor adhesion was 400 g, which was sufficient. The swelling ratio of the 50:50 blend of the ionomer and the high-density polyethylene was 70%.
【００２８】（実施例２）実施例１で用いたアイオノマ
ーとＭＩ＝２．０の密度＝０．９１８の低密度ポリエチ
レン（三井石油化学社製の商品名「ミラソン２７」）及
びアゾジカルポンアミドを２０：６０：２の割合でブレ
ンドし、二軸押出機（池貝鉄工社製の商品名「ＰＣＭ−
３０」）で溶融混合し、ベレットを作製した。このベレ
ットとＭＩ＝１．２のポリプロピレンホモポリマー（三
菱化学社製の商品名「三菱ポリプロＭＨ６」）を８２：
２０の割合でドライブレンドした樹脂材料を発泡押出機
を用いて、外径０．２ｍｍφの銅線上に肉厚０．１５ｍ
ｍで発泡押出し、発泡度７０％の発泡電線を得た。電線
表面の外観は良好で、導体密着力も２５０ｇであり、十
分な密着力であった。発泡剤を除いたこの樹脂材料のス
エリング比は１１０％であった。(Example 2) The ionomer used in Example 1, low-density polyethylene having MI = 2.0 and density = 0.918 (trade name "Mirason 27" manufactured by Mitsui Petrochemical Co., Ltd.) and azodicarponamide In a ratio of 20: 60: 2, and a twin screw extruder (trade name “PCM-
30 ") to produce a bellet. This beret and a polypropylene homopolymer having MI = 1.2 (trade name “Mitsubishi Polypro MH6” manufactured by Mitsubishi Chemical Corporation) were used as 82:
Using a foam extruder, a resin material dry-blended at a ratio of 20 was coated on a copper wire having an outer diameter of 0.2 mm to a thickness of 0.15 m.
m to obtain a foamed electric wire having a foaming degree of 70%. The appearance of the wire surface was good, the conductor adhesion was 250 g, and the adhesion was sufficient. The swelling ratio of this resin material excluding the foaming agent was 110%.
【００２９】（実施例３）実施例１で用いたアイオノマ
ーとＭＩ＝０．８、密度＝０．９０の超低密度ポリエチ
レン（住友化学工業（株）製の商品名「エクセレンＶＬ
１００」）及びアゾジカルポンアミドを３０：４０：２
の割合でブレンドし、二軸押出機（池貝鉄工社製の商品
名「ＰＣＭ−３０」）で溶融混合し、ベレットを作製し
た。このベレットとＭＩ＝１．５のエチレン−プロピレ
ンブロックコポリマー（三菱化学社製の商品名「三菱ポ
リプロＥＣ８」）を７２：３０の割合でドライブレンド
した。この樹脂材料を発泡押出機を用いて、外径０．２
ｍｍφの銅線上に肉厚０．１５ｍｍで発泡押出し、発泡
度６０％の発泡電線を得た。電線表面の外観は良好で導
体密着力も３５０ｇあり、十分な密着性であった。発泡
剤を除いたこの樹脂のスエリング比は８０％であった。Example 3 The ionomer used in Example 1 and an ultra-low density polyethylene having MI = 0.8 and density = 0.90 (trade name “Excellen VL” manufactured by Sumitomo Chemical Co., Ltd.)
100 ") and azodicarponamide in 30: 40: 2
And melt-mixed with a twin-screw extruder (trade name “PCM-30” manufactured by Ikegai Iron Works Co., Ltd.) to produce a bellet. This beret and an ethylene-propylene block copolymer with MI = 1.5 (trade name “Mitsubishi Polypro EC8” manufactured by Mitsubishi Chemical Corporation) were dry-blended at a ratio of 72:30. Using a foaming extruder, this resin material was used to obtain an outer diameter of 0.2
It was foamed and extruded with a wall thickness of 0.15 mm onto a copper wire of mmφ to obtain a foamed electric wire having a foaming degree of 60%. The appearance of the wire surface was good and the conductor adhesion was 350 g, which was sufficient adhesion. The swelling ratio of this resin excluding the foaming agent was 80%.
【００３０】（実施例４）実施例１で用いたアイオノマ
ーとＭＩ＝２．０の密度＝０．９１８の低密度ポリエチ
レン（三井石油化学社製の商品名「ミラソン２７」）及
びＭＩ＝１．２のポリプロピレンホモポリマー（三菱化
学社製の商品名「三菱ポリプロＭＨ６」）を２０：６
０：２０の割合でブレンドし、二軸押出機（池貝鉄工社
製の商品名「ＰＣＭ−３０」）で溶融混合し、ベレット
を作製した。このベレットをガス発泡押出機にて窒素ガ
スを注入しながら外径０・２ｍｍφの導体上に肉厚０．
１５ｍｍで発泡押出し、発泡度６５％の発泡電線を得
た。電線表面の外観は良好で、導体密着力も良好であっ
た。Example 4 The ionomer used in Example 1, the low density polyethylene having MI = 2.0 and the density = 0.918 (trade name “Milason 27” manufactured by Mitsui Petrochemical Co., Ltd.) and MI = 1. 20: 6 polypropylene homopolymer (trade name “Mitsubishi Polypro MH6” manufactured by Mitsubishi Chemical Corporation).
Blends were blended at a ratio of 0:20 and melt-mixed with a twin-screw extruder (trade name “PCM-30” manufactured by Ikegai Iron Works Co., Ltd.) to produce a bellet. This beret was put on a conductor having an outer diameter of 0.2 mmφ with a wall thickness of 0.2 mm while injecting nitrogen gas with a gas foaming extruder.
Foam extrusion was performed at 15 mm to obtain a foamed electric wire having a foaming degree of 65%. The appearance of the wire surface was good and the conductor adhesion was good.
【００３１】（比較例１〜３）アイオノマーをブレンド
しないでＭＩ＝０．８の密度＝０．９５３の高密度ポリ
エチレン（三井石油化学社製の商品名「ハイゼックス５
３０５Ｅ」）単独やＭＩ＝２．０の密度＝０．９１８の
低密度ポリエチレン（三井石油化学社製の商品名「ミラ
ソン２７」）とポリプロピレン（三菱化学社製の商品名
「三菱ポリプロＭＨ６」）のブレンド物で発泡押出を行
った場合は、下記表１の比較例１、２に示すように、導
体との密着力が不十分で、簡単に導体が絶縁から抜けて
しまった。また、比較例３に示すように、スエリング比
が５５％に満たないベーズ樹脂材料を用いた場合は、発
泡度を上げるのが難しく、５５％程度の発泡度でも表面
外観が荒れてしまった。(Comparative Examples 1 to 3) A high-density polyethylene having an MI of 0.8 and a density of 0.953 (trade name "HIZEX5" manufactured by Mitsui Petrochemical Co., Ltd.) without blending an ionomer
305E ") alone or low-density polyethylene with MI = 2.0 and density = 0.918 (trade name" Milason 27 "manufactured by Mitsui Petrochemicals) and polypropylene (trade name" Mitsubishi Polypro MH6 "manufactured by Mitsubishi Chemical Corporation) When foam extrusion was performed with the blend of the above, as shown in Comparative Examples 1 and 2 in Table 1 below, the adhesion to the conductor was insufficient, and the conductor easily came off the insulation. Further, as shown in Comparative Example 3, when a swelling ratio of less than 55% was used, it was difficult to increase the degree of foaming, and even at a degree of foaming of about 55%, the surface appearance was roughened.
【００３２】これらの結果を以下の表１にまとめた。The results are summarized in Table 1 below.
【表１】 [Table 1]
【００３３】[0033]
【発明の効果】以上の通り、本発明によると、スエリン
グ比が５５％以上のポリオレフィン、特にカルボン酸又
はカルボン酸無水物基含有共単量体を含む共重合体の部
分金属塩を１０重量％以上含有するポリオレフィンを導
体上に高発泡に押出発泡して発泡絶縁層を形成すること
により、特に高速データ通信用に適する、導体との密着
力に優れた且つ良好な外観、ばらつきのない低い誘電率
を有する細径で且つ高発泡のポリオレフィン絶縁電線を
提供できる。As described above, according to the present invention, 10% by weight of a partial metal salt of a polyolefin having a swelling ratio of 55% or more, particularly a copolymer containing a carboxylic acid or a carboxylic acid anhydride group-containing comonomer, is used. The polyolefin containing above is extruded and foamed on the conductor in a highly foamed manner to form a foamed insulating layer, which is particularly suitable for high-speed data communication, has excellent adhesion to the conductor, has a good appearance, and has a low dielectric constant. It is possible to provide a small-diameter and highly foamed polyolefin insulated wire having a high modulus.
【図１】導体密着力の測定法を説明する模式図である。FIG. 1 is a schematic diagram illustrating a method for measuring a conductor adhesion force.
１ 導体 ２ 治具 ３ 被覆（絶縁体） DESCRIPTION OF SYMBOLS 1 Conductor 2 Jig 3 Coating (insulator)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０１Ｂ 13/14 Ｃ０８Ｌ 23/00 // Ｃ０８Ｌ 23/00 23/26 23/26 Ｂ２９Ｃ 67/22 Ｂ２９Ｋ 23:00 105:04 705:00 Ｂ２９Ｌ 9:00 (72)発明者 平川 芳司尋 栃木県鹿沼市さつき町３番の３ 住友電気 工業株式会社関東製作所内 (72)発明者 佐野 正人 栃木県鹿沼市さつき町３番の３ 住友電気 工業株式会社関東製作所内 (72)発明者 大塚 裕之 栃木県鹿沼市さつき町３番の３ 住友電気 工業株式会社関東製作所内──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI H01B 13/14 C08L 23/00 // C08L 23/00 23/26 23/26 B29C 67/22 B29K 23:00 105: 04 705 : 00 B29L 9:00 (72) Inventor Yoshihiro Hirakawa 3-3 Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo Electric Industries, Ltd. Kanto Works (72) Inventor Masato Sano 3-3, Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo (72) Inventor Hiroyuki Otsuka 3-3 Satsuki-cho, Kanuma-shi, Tochigi Pref. Sumitomo Electric Industries, Ltd. Kanto Works
Claims (4)
０．８ｍｍ以下の発泡ポリオレフィン絶縁電線であっ
て、 等価誘電率が１．６より小さい、 等価誘電率のばらつきが±０．１以内であり、 導体引抜力が１００ｇ／５０ｍｍ以上である の３つの要件を兼備することを特徴とする、発泡ポリオ
レフィン絶縁電線。1. A foamed polyolefin insulated wire having a conductor diameter of 0.4 mmφ or less and an insulation coating thickness of 0.8 mm or less, having an equivalent permittivity of less than 1.6 and a variation of an equivalent permittivity within ± 0.1. A foamed polyolefin insulated wire characterized by having the following three requirements: a conductor pull-out force of 100 g / 50 mm or more.
ルボン酸無水物基含有共単量体を含む共重合体の部分金
属塩を１０重量％以上含有するポリオレフィンを使用す
ることを特徴とする、請求項１記載の発泡ポリオレフィ
ン絶縁電線。2. A polyolefin containing 10% by weight or more of a partial metal salt of a copolymer containing a carboxylic acid or a carboxylic acid anhydride group-containing comonomer as the polyolefin. Foamed polyolefin insulated wire.
を用いて、スエリング比が５５％以上のポリオレフィン
を発泡度５０％以上に押出発泡して導体上に発泡層を形
成することを特徴とする、請求項１記載の発泡ポリオレ
フィン絶縁電線の製造方法。3. A foamed layer is formed on a conductor by extruding a polyolefin having a swelling ratio of 55% or more to a foaming degree of 50% or more by using a chemical blowing agent and / or an inert gas blowing agent. The method for producing a foamed polyolefin insulated wire according to claim 1.
ルボン酸無水物基含有共単量体を含む共重合体の部分金
属塩を１０重量％以上含有するポリオレフィンを使用す
ることを特徴とする、請求項３記載の発泡ポリオレフィ
ン絶縁電線の製造方法。4. A polyolefin containing 10% by weight or more of a partial metal salt of a copolymer containing a carboxylic acid or a carboxylic anhydride group-containing comonomer is used as the polyolefin. For producing a foamed polyolefin insulated wire.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02158598A JP3344307B2 (en) | 1998-01-20 | 1998-01-20 | Fine-diameter foamed electric wire and method of manufacturing the same |
| US09/597,256 US6613983B1 (en) | 1998-01-20 | 2000-06-19 | Thin-conductor foamed-polyolefin-insulated wire and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02158598A JP3344307B2 (en) | 1998-01-20 | 1998-01-20 | Fine-diameter foamed electric wire and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11213759A true JPH11213759A (en) | 1999-08-06 |
| JP3344307B2 JP3344307B2 (en) | 2002-11-11 |
Family
ID=12059126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02158598A Expired - Fee Related JP3344307B2 (en) | 1998-01-20 | 1998-01-20 | Fine-diameter foamed electric wire and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3344307B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003073492A (en) * | 2001-08-30 | 2003-03-12 | Tosoh Corp | Foamable resin composition and use thereof |
| JP2005290329A (en) * | 2004-04-05 | 2005-10-20 | Sekisui Plastics Co Ltd | Ethylene-based resin foamed sheet, formed product and method for producing the ethylene-based resin foamed sheet |
| US9115254B2 (en) | 2010-02-12 | 2015-08-25 | Hitachi Metals, Ltd. | Resin composition, foamed resin using same, and electric wire insulated with foamed resin |
| JP2016015255A (en) * | 2014-07-02 | 2016-01-28 | 日立金属株式会社 | Differential signal transmission cable, method of manufacturing the same, and multi-core differential signal transmission cable |
| CN112341808A (en) * | 2020-11-30 | 2021-02-09 | 上海普利特复合材料股份有限公司 | Wood powder reinforced micro-foaming polyamide compound with low dielectric constant and high dielectric strength and preparation method thereof |
-
1998
- 1998-01-20 JP JP02158598A patent/JP3344307B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003073492A (en) * | 2001-08-30 | 2003-03-12 | Tosoh Corp | Foamable resin composition and use thereof |
| JP2005290329A (en) * | 2004-04-05 | 2005-10-20 | Sekisui Plastics Co Ltd | Ethylene-based resin foamed sheet, formed product and method for producing the ethylene-based resin foamed sheet |
| JP4680528B2 (en) * | 2004-04-05 | 2011-05-11 | 積水化成品工業株式会社 | Ethylene resin foam sheet for thermoforming, molded article, and method for producing ethylene resin foam sheet for thermoforming |
| US9115254B2 (en) | 2010-02-12 | 2015-08-25 | Hitachi Metals, Ltd. | Resin composition, foamed resin using same, and electric wire insulated with foamed resin |
| JP2016015255A (en) * | 2014-07-02 | 2016-01-28 | 日立金属株式会社 | Differential signal transmission cable, method of manufacturing the same, and multi-core differential signal transmission cable |
| CN112341808A (en) * | 2020-11-30 | 2021-02-09 | 上海普利特复合材料股份有限公司 | Wood powder reinforced micro-foaming polyamide compound with low dielectric constant and high dielectric strength and preparation method thereof |
| CN112341808B (en) * | 2020-11-30 | 2023-04-07 | 上海普利特复合材料股份有限公司 | Wood powder reinforced micro-foaming polyamide compound with low dielectric constant and high dielectric strength and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3344307B2 (en) | 2002-11-11 |
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