JPS629137B2 - - Google Patents
Info
- Publication number
- JPS629137B2 JPS629137B2 JP54026335A JP2633579A JPS629137B2 JP S629137 B2 JPS629137 B2 JP S629137B2 JP 54026335 A JP54026335 A JP 54026335A JP 2633579 A JP2633579 A JP 2633579A JP S629137 B2 JPS629137 B2 JP S629137B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- polyethylene
- methylene
- tetrakis
- 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.)
- Expired
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- -1 polyethylene Polymers 0.000 claims description 11
- 239000004698 Polyethylene Substances 0.000 claims description 10
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 7
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- XOUQAVYLRNOXDO-UHFFFAOYSA-N 2-tert-butyl-5-methylphenol Chemical compound CC1=CC=C(C(C)(C)C)C(O)=C1 XOUQAVYLRNOXDO-UHFFFAOYSA-N 0.000 claims description 2
- 229920001038 ethylene copolymer Polymers 0.000 claims description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000003679 aging effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- RPBCDDTWDKYNQY-UHFFFAOYSA-N o-dodecyl propanethioate Chemical compound CCCCCCCCCCCCOC(=S)CC RPBCDDTWDKYNQY-UHFFFAOYSA-N 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- 240000005572 Syzygium cordatum Species 0.000 description 2
- 235000006650 Syzygium cordatum Nutrition 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- QLZJUIZVJLSNDD-UHFFFAOYSA-N 2-(2-methylidenebutanoyloxy)ethyl 2-methylidenebutanoate Chemical compound CCC(=C)C(=O)OCCOC(=O)C(=C)CC QLZJUIZVJLSNDD-UHFFFAOYSA-N 0.000 description 1
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 1
- ODJQKYXPKWQWNK-UHFFFAOYSA-L 3-(2-carboxylatoethylsulfanyl)propanoate Chemical compound [O-]C(=O)CCSCCC([O-])=O ODJQKYXPKWQWNK-UHFFFAOYSA-L 0.000 description 1
- WTFUTSCZYYCBAY-SXBRIOAWSA-N 6-[(E)-C-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-N-hydroxycarbonimidoyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C/C(=N/O)/C1=CC2=C(NC(O2)=O)C=C1 WTFUTSCZYYCBAY-SXBRIOAWSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Description
本発明は架橋ポリエチレン系絶縁体の耐水トリ
ー性、特にボウタイトリーを抑制することのでき
た組成物に関するものである。
架橋ポリエチレン系組成物は、ポリエチレンま
たはエチレン共重合体に酸化防止剤、架橋剤を配
合したものから成る。また必要によつては加工性
改良のため滑剤や耐候性付与剤、コア識別を目的
として着色剤を添加する場合もある。
近年、架橋ポリエチレン絶縁ケーブルの問題点
として、水トリーおよびボウタイトリーの発生が
クローズアツプしている。今後とも地下埋設化が
進むことを考慮すると、浸水状態における課電劣
化すなわち水トリー、ボウタイトリーを抑制する
ことは重要なことである。
ところで、現在最もよく使用されている酸化防
止剤4,4′―チオビス(6―ターシヤリブチル―
3―メチルフエノール)はポリエチレンとの相溶
性の限度が約0.1重量部と少ないにも拘らず、架
橋ポリエチレンケーブルの耐熱性を保持させるた
め、通常0.2重量部以上使用されている。そのた
め相溶限度を越えたものがブルームすることによ
つてボウタイトリーの核になる懸念がある。
したがつて熱老化特性にすぐれた組成であつて
しかもボウタイトリーの発生を著しく軽減する組
成を開発することができれば高電圧架橋ポリエチ
レンケーブルの信頼性向上に著しく寄与できるも
のと考える。
本発明の目的は、前記した従来技術の欠点を解
消し、熱老化特性にすぐれかつ耐ボウタイトリー
性を著しく改善することができる高電圧絶縁体用
の架橋ポリエチレン系組成物を提供することにあ
る。
本願発明者等は種々研究、実験の結果、高い熱
老化特性を保持し、かつ耐ボウタイトリー性を改
善する酸化防止剤として、4,4′―チオビス(6
―ターシヤリブチル―3―メチルフエノール)に
テトラキス{メチレン(ドデシルチオプロピオネ
ート)}メタンを併用することが有効であること
をみいだした。
これによつて4,4′―チオビス―(6―ターシ
ヤリブチル―3―メチルフエノール)単独の場合
に比べて熱老化特性がすぐれているばかりでな
く、耐ボウタイトリー性が著しく改善されている
ことを確認した。なお、テトラキス{メチレン
(ドデシルチオプロピオネート)}メタン単独で
は、熱老化特性を付与することは困難であり、多
量に添加すると架橋阻害をもたらす。
ベースレジンとしては、低密度ポリエチレン、
中密度ポリエチレン、エチレン―酢酸ビニルコポ
リマ、エチレン―エチルアクリレート、エチレン
―プロピレン共重合体などエチレンを過半に含む
ポリオレフインが該当する。これらのうち1種ま
たは2種以上組合せて用いてもよい。
架橋剤としては通常使用されるジクミルパーオ
キサイド、1,3―ビス―(t―ブチル・パーオ
キシーイソプロパル)ベンゼン、2,5―ジメチ
ル―2,5―ジ―(t―ブチルパーオキシ)―ヘ
キシン―3などがあげられる。
その他必要によつては滑剤、着色剤、充填剤、
架橋促進剤などを添加することは一向に差支えな
い。
以下に本発明の実施例を比較例と共に説明す
る。
実施例 1
ポリエチレン(溶融指数MI=1.0、密度d=
0.92)100重量部に、酸化防止剤として4′,4′―チ
オビス―(6―ターシヤリブチル―3―メチルフ
エノール)0.1重量部、テトラキス{メチレン―
(ドデシルチオプロピオネート)}メタン0.2重量
部、架橋剤としてジクミルパーオキサイド2.5重
量部を120℃の熱ロールで混練した。これを外径
3mmの銅導体上に絶縁厚3mmになるように押出被
覆した。これを15Kg/cm2の水蒸気で10分間架橋し
加圧冷却した。この電線を常温〜90℃のヒートサ
イクル水中に浸漬し、導体ー水間にAC5KVを300
時間印加した。
これを薄くスライスしてメチレンブルー水溶液
で煮沸染色した。
光学顕微鏡を用いてボウタイトリー発生の有無
を観察した。
実施例 2
エチレン―酢酸ビニル共重合体(酢ビ量1.8
%、MI=2)100重量部に、4,4′―チオビス
(6―ターシヤリブチル―3―メチルフエノー
ル)0.2重量部、テトラキス{メチレン―(ドデ
シルチオプロピオネート)}メタン0.2重量部、ジ
クミルパーオキサイド2.5重量部から成る組成を
実施例1と同様な方向により実験した。
実施例 3
ポリエチレン(MI=3、d=950)100重量部
に、4′,4′―チオビス(6―ターシヤリブチル―
3―メチルフエノール)0.1重量部、テトラキス
{メチレン―(ドデシルチオプロピオネート)}メ
タン0.3重量部、2,5―ジメチル―2,5―ジ
―(t―ブチルパーオキシ)―ヘキシン―31.5重
量部から成る組成を実施例1と同様な方法により
実験した。
比較例 1
ポリエチレン(MI=1.0、d=0.92)100重量部
に、4,4′―チオビス(6―ターシヤリブチル―
3―メチルフエノール)0.25重量部、ジクミルパ
ーオキサイド2.5重量部から成る組成を実施例1
と同様な方法により実験した。
比較例 2
ポリエチレン(MI=1.0、d=0.92)100重量部
に、テトラキス{メチレン―(ドデシルチオプロ
ピオネート)}メタン0.4重量部、ジクミルパーオ
キサイド2.5重量部から成る組成を実施例1と同
様な方法により実験した。
比較例 3
ポリエチレン(MI=1.0、d=0.92)100重量部
に、4,4′―チオビス(6―ターシヤリブチル―
3―メチルフエノール)0.1重量部、n―オクタ
デシル―3―(4′―ヒドロキシ―3′,5′―ジ―t
―ブチル・フエニル)プロピオネート0.3重量
部、ジクミルパーオキサイド2.5重量部から成る
組成を実施例1と同様な方法により実験した。
比較例 4
ポリエチレン(MI=1.0、d=0.92)100重量部
に、テトラキス{メチレン―(ドデシルチオプロ
ピオネート)}メタン0.2重量部、テトラキス―
{メチレン―3―(3′,5′―t―ブチル―4′―ヒド
ロキシフエニル)プロピオネート}メタン0.1重
量部、ジクミルパーオキサイド2.5重量部から成
る組成を実施例1と同様な方法により実験した。
比較例 5
ポリエチレン(MI=1.0、d=0.92)100重量部
に4′,4′―チオビス(6―ターシヤリブチル―3
―メチルフエノール)0.2重量部、ジラウリル・
チオジプロピオネート0.2重量部、ジクミルパー
オキサイド2.5重量部から成る組成を実施例1と
同様な方法により実験した。
各例によるモデルケーブルのボウタイトリー発
生数および熱老化性は表1の通りである。
The present invention relates to the water resistance of crosslinked polyethylene insulators, particularly to a composition capable of suppressing bow tree. The crosslinked polyethylene composition is composed of polyethylene or an ethylene copolymer blended with an antioxidant and a crosslinking agent. In addition, if necessary, a lubricant or a weather resistance imparting agent may be added to improve processability, and a coloring agent may be added for the purpose of core identification. In recent years, the occurrence of water trees and bow tree trees has become a growing problem with cross-linked polyethylene insulated cables. Considering that underground burying will continue to progress in the future, it is important to suppress deterioration due to electrical charging in flooded conditions, that is, water tree and bow tree. By the way, the antioxidant 4,4'-thiobis(6-tertiarybutyl-) is currently most commonly used.
Although the limit of compatibility with polyethylene (3-methylphenol) is as low as about 0.1 parts by weight, it is usually used in amounts of 0.2 parts by weight or more in order to maintain the heat resistance of crosslinked polyethylene cables. Therefore, there is a concern that something that exceeds the compatibility limit will bloom and become the nucleus of bow tite tree. Therefore, we believe that if we can develop a composition that has excellent heat aging properties and also significantly reduces the occurrence of bow tie tree, it will make a significant contribution to improving the reliability of high voltage cross-linked polyethylene cables. An object of the present invention is to provide a crosslinked polyethylene composition for high-voltage insulators that can eliminate the drawbacks of the prior art described above and has excellent heat aging characteristics and significantly improved bow tie resistance. . As a result of various research and experiments, the inventors of the present application have found that 4,4'-thiobis(6
It has been found that it is effective to use tetrakis{methylene (dodecylthiopropionate)}methane in combination with tertiarybutyl-3-methylphenol). As a result, not only is the heat aging property superior to that of 4,4'-thiobis-(6-tertiarybutyl-3-methylphenol) alone, but the bowtery resistance is also significantly improved. It was confirmed. Note that it is difficult to impart heat aging properties with tetrakis{methylene (dodecylthiopropionate)}methane alone, and when added in a large amount, crosslinking is inhibited. The base resin is low density polyethylene,
This applies to polyolefins containing a majority of ethylene, such as medium-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate, and ethylene-propylene copolymer. One type or a combination of two or more types of these may be used. Commonly used crosslinking agents include dicumyl peroxide, 1,3-bis-(t-butyl peroxy-isopropal)benzene, and 2,5-dimethyl-2,5-di-(t-butyl peroxy). -Hexine-3 etc. Other lubricants, colorants, fillers, if necessary,
There is no problem in adding a crosslinking accelerator or the like. Examples of the present invention will be described below along with comparative examples. Example 1 Polyethylene (melting index MI=1.0, density d=
0.92) 100 parts by weight, 0.1 part by weight of 4′,4′-thiobis-(6-tertiarybutyl-3-methylphenol) as an antioxidant, and tetrakis {methylene-
(Dodecylthiopropionate)} 0.2 parts by weight of methane and 2.5 parts by weight of dicumyl peroxide as a crosslinking agent were kneaded with a heated roll at 120°C. This was extruded and coated onto a copper conductor having an outer diameter of 3 mm to an insulation thickness of 3 mm. This was crosslinked with water vapor at 15 kg/cm 2 for 10 minutes and cooled under pressure. Immerse this wire in heat cycle water at room temperature to 90℃, and apply 300 AC5KV between the conductor and the water.
time was applied. This was sliced thinly and boiled and stained with a methylene blue aqueous solution. The presence or absence of bow tit tree development was observed using an optical microscope. Example 2 Ethylene-vinyl acetate copolymer (vinyl acetate amount 1.8
%, MI=2), 0.2 parts by weight of 4,4′-thiobis(6-tertiarybutyl-3-methylphenol), 0.2 parts by weight of tetrakis {methylene-(dodecylthiopropionate)}methane, Experiments were conducted in the same manner as in Example 1 using a composition consisting of 2.5 parts by weight of dicumyl peroxide. Example 3 To 100 parts by weight of polyethylene (MI=3, d=950), 4',4'-thiobis(6-tertiarybutyl-
3-methylphenol) 0.1 part by weight, tetrakis {methylene-(dodecylthiopropionate)}methane 0.3 parts by weight, 2,5-dimethyl-2,5-di-(t-butylperoxy)-hexyne-31.5 parts by weight Experiments were conducted using the same method as in Example 1. Comparative Example 1 100 parts by weight of polyethylene (MI=1.0, d=0.92) was added with 4,4′-thiobis(6-tertiarybutyl).
Example 1: A composition consisting of 0.25 parts by weight of 3-methylphenol) and 2.5 parts by weight of dicumyl peroxide.
An experiment was conducted using the same method as . Comparative Example 2 A composition consisting of 100 parts by weight of polyethylene (MI=1.0, d=0.92), 0.4 parts by weight of tetrakis {methylene-(dodecylthiopropionate)}methane, and 2.5 parts by weight of dicumyl peroxide was used as in Example 1. Experiments were conducted in a similar manner. Comparative Example 3 To 100 parts by weight of polyethylene (MI=1.0, d=0.92), 4,4'-thiobis(6-tertiarybutyl-
3-methylphenol) 0.1 part by weight, n-octadecyl-3-(4'-hydroxy-3',5'-di-t
An experiment was conducted in the same manner as in Example 1 using a composition consisting of 0.3 parts by weight of -butyl phenyl) propionate and 2.5 parts by weight of dicumyl peroxide. Comparative Example 4 100 parts by weight of polyethylene (MI=1.0, d=0.92), 0.2 parts by weight of tetrakis {methylene-(dodecylthiopropionate)}methane, tetrakis-
{methylene-3-(3',5'-t-butyl-4'-hydroxyphenyl)propionate} A composition consisting of 0.1 parts by weight of methane and 2.5 parts by weight of dicumyl peroxide was tested in the same manner as in Example 1. did. Comparative Example 5 4′,4′-thiobis(6-tertiarybutyl-3) was added to 100 parts by weight of polyethylene (MI=1.0, d=0.92).
- Methylphenol) 0.2 parts by weight, dilauryl
Experiments were conducted in the same manner as in Example 1 using a composition consisting of 0.2 parts by weight of thiodipropionate and 2.5 parts by weight of dicumyl peroxide. Table 1 shows the number of bow tie occurrences and heat aging properties of the model cables according to each example.
【表】【table】
【表】
以上説明したところからも明らかなように、従
来のチオビスアルキルフエノール単独の場合に比
べて、本発明の酸化防止剤系は熱老化性および耐
ボウタイトリー性の両方を著しく改善できた。こ
の理由としてはテトラキス{メチレン―(ドデシ
ルチオプロピオネート)}メタンがポリエチレン
との親和性にすぐれているためポリマとのぬれを
よくしていることによつてボウタイトリーを発生
しにくくしているものと思われる。なお、テトラ
キス{メチレン―(ドデシルチオプロピオネー
ト)}メタン単独の場合には熱老化特性が不十分
であり、たとえ増量しても架橋阻害がおこるため
実用はむずかしい。両者を併用することが重要で
ある。[Table] As is clear from the above explanation, the antioxidant system of the present invention was able to significantly improve both heat aging resistance and bow tie resistance compared to the case of conventional thiobisalkylphenol alone. . The reason for this is that tetrakis{methylene-(dodecylthiopropionate)}methane has an excellent affinity with polyethylene, which improves wetting with the polymer and makes it difficult to generate bowtery. It seems to be. Note that in the case of tetrakis{methylene-(dodecylthiopropionate)}methane alone, the heat aging properties are insufficient, and even if the amount is increased, crosslinking will be inhibited, making it difficult to put it into practical use. It is important to use both together.
Claims (1)
重合体に、酸化防止剤として4,4′―チオビス―
(6―ターシヤリブチル―3―メチルフエノー
ル)とテトラキス{メチレン―(ドデシルチオプ
ロピオネート)}メタンを併用してなることを特
徴とする架橋ポリエチレン系組成物。1 Add 4,4'-thiobis- as an antioxidant to polyethylene or ethylene copolymer containing a crosslinking agent.
A crosslinked polyethylene composition characterized in that it is formed by using a combination of (6-tertiarybutyl-3-methylphenol) and tetrakis{methylene-(dodecylthiopropionate)}methane.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2633579A JPS55118938A (en) | 1979-03-06 | 1979-03-06 | Crosslinked polyethylene resin composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2633579A JPS55118938A (en) | 1979-03-06 | 1979-03-06 | Crosslinked polyethylene resin composition |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55118938A JPS55118938A (en) | 1980-09-12 |
JPS629137B2 true JPS629137B2 (en) | 1987-02-26 |
Family
ID=12190556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2633579A Granted JPS55118938A (en) | 1979-03-06 | 1979-03-06 | Crosslinked polyethylene resin composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55118938A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6116939A (en) * | 1984-07-03 | 1986-01-24 | Hitachi Cable Ltd | Heat-resistant and transparent polyolefin resin composition |
JPS6116941A (en) * | 1984-07-04 | 1986-01-24 | Hitachi Cable Ltd | Heat-resistant and transparent polyolefin resin composition |
JPS6116940A (en) * | 1984-07-04 | 1986-01-24 | Hitachi Cable Ltd | Heat-resistant and transparent polyolefin resin compostion |
JPS6119645A (en) * | 1984-07-05 | 1986-01-28 | Hitachi Cable Ltd | Heat-resistant, transparent polyolefin resin composition |
JP5687024B2 (en) * | 2010-10-18 | 2015-03-18 | 株式会社フジクラ | Insulating resin composition for insulated wires, insulated wires and cables |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5245648A (en) * | 1975-10-09 | 1977-04-11 | Showa Electric Wire & Cable Co Ltd | Electrical insulating articles havin resistance to water trees |
JPS52145800A (en) * | 1976-05-31 | 1977-12-05 | Showa Electric Wire & Cable Co | Method of forming electric insulator |
JPS5418856A (en) * | 1977-07-12 | 1979-02-13 | Basf Ag | Method of making crosslinkable ethylene polymer |
-
1979
- 1979-03-06 JP JP2633579A patent/JPS55118938A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5245648A (en) * | 1975-10-09 | 1977-04-11 | Showa Electric Wire & Cable Co Ltd | Electrical insulating articles havin resistance to water trees |
JPS52145800A (en) * | 1976-05-31 | 1977-12-05 | Showa Electric Wire & Cable Co | Method of forming electric insulator |
JPS5418856A (en) * | 1977-07-12 | 1979-02-13 | Basf Ag | Method of making crosslinkable ethylene polymer |
Also Published As
Publication number | Publication date |
---|---|
JPS55118938A (en) | 1980-09-12 |
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