JPS631735B2 - - Google Patents
Info
- Publication number
- JPS631735B2 JPS631735B2 JP55035127A JP3512780A JPS631735B2 JP S631735 B2 JPS631735 B2 JP S631735B2 JP 55035127 A JP55035127 A JP 55035127A JP 3512780 A JP3512780 A JP 3512780A JP S631735 B2 JPS631735 B2 JP S631735B2
- Authority
- JP
- Japan
- Prior art keywords
- polypropylene
- boiling heptane
- oil
- capacitor
- film
- 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
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 46
- 239000004743 Polypropylene Substances 0.000 claims description 25
- -1 polypropylene Polymers 0.000 claims description 25
- 229920001155 polypropylene Polymers 0.000 claims description 25
- 238000009835 boiling Methods 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 description 18
- 230000008961 swelling Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000123 paper Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Insulating Of Coils (AREA)
- Regulation Of General Use Transformers (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Organic Insulating Materials (AREA)
Description
本発明は油入電気機器の絶縁に関するものであ
る。油入電気機器、例えば油入コンデンサや油入
ケーブルにおいては、最近従来のクラフト紙のよ
うな絶縁紙にかえ、プラスチツクフイルムやテー
プを絶縁に用いる気運となつている。しかし、例
えば、ポリプロピレンのフイルムとアルミニウム
箔を用いてコンデンサ素子を巻回し、これを絶縁
油中に浸漬した場合、ポリプロピレンフイルムは
例えば芳香族系絶縁油に対する溶解性が大きく、
膨潤を生じ、小型化、長寿命化を図ることは困難
であつた。ケーブル導体上に上述のようなポリプ
ロピレンテープを巻回して絶縁層を形成した油入
ケーブルにおいても同様に溶解、膨潤の問題を生
じる。
本発明は、ポリプロピレンの沸騰ヘプタン不溶
部のアイソタクチツク．ペンタツド分率が0.955、
好ましくは0.96以上であり、またポリプロピレン
の沸騰ヘプタン可溶部の含有量は9.0重量パーセ
ント好ましくは8.0重量パーセント以下であるポ
リプロピレンを２軸延伸したフイルムを用いて、
コンデンサ素子あるいはケーブルの絶縁層等を形
成することを特徴とする油入電気機器にある。
まず、前記のポリプロピレンの沸騰ヘプタン不
溶部のアイソタクチツク．ペンタツド分率および
沸騰ヘプタン可溶部の含有率は次のように定めら
れる。ポリプロピレン５ｇを沸騰キシレン500ml
に完全に溶解させた後、20℃に降温し、４時間放
置する。その後、瀘別し、20℃キシレン可溶部と
不溶部に分離する。次いで、20℃キシレン不溶部
を更に沸騰ヘプタンで８時間、ソツクスレー抽出
器で抽出して、抽出残渣と抽出物に分離する。こ
の抽出残渣を沸騰ヘプタン不溶部とする。この乾
燥重量を測定に供した全ポリプロピレン重量から
減じた値を、全ポリプロピレン重量で除した値を
重量百分率で表わしたものが、沸騰ヘプタン可溶
部の含有量である。
アイソタクチツク．ペンタツド分率とはA.
ZambelliらによつてMacromolecules６、925
（1973）に発表されている方法、すなわち、 13C
―NMRを使用して測定されるポリプロピレン分
子鎖のペンタツド単位でのアイソタクチツク連
鎖、換言すれば、プロピレンモノマー単位が５個
連続してメソ結合した連鎖の中心にあるプロピレ
ンモノマー単位の分率である。
本発明で使用するポリプロピレンのメルト．フ
ローレイトは延伸フイルム分野で用いられている
範囲のものでもよいが、さらにJIS Ｋ 7210―
1976により230℃で測定した値で0.3〜６の範囲の
ものが好ましい。また本発明で使用するポリプロ
ピレン２軸延伸フイルムには必要に応じて、熱安
定剤、酸化防止剤、その他の添加剤を含むことが
できる。
更に本発明においてポリプロピレンより２軸延
伸する方法は通常工業的に用いられている方法、
例えば、テンター方式、チユーブラー方式等の延
伸機を用いることができる。
以下、本発明の油入電気機器に用いられるポリ
プロピレンフイルムの使用例について説明する。
使用例 １
メルトフローレイトが2.0、沸騰ヘプタン不溶
部のアイソタクチツク．ペンタツド分率が0.965、
沸騰ヘプタン可溶部の含有量が6.8重量パーセン
トのポリプロピレンにフエノール系安定剤を0.2
重量パーセント加え、Ｔダイ押出機を用い、290
℃で溶融押出しを行ない、ついで、冷却ロールに
より冷却し、厚さ1.2mmのシートを得た。このシ
ートを150℃の表面温度を有するロールで一方向
に5.5倍延伸し、引続きテンター方式延伸機（165
℃に調節）にて第１段の方向と直交する方向に９
倍延伸し、135℃で熱処理を施して厚さ22μmの２
軸延伸ポリプロピレンフイルムを得た。
比較例 １
メルトフロー．レイト2.0、沸騰ヘプタン不溶
部のアイソタクチツク．ペンタツド分率0.950、
沸騰ヘプタン可溶部の含有率が11.2重量パーセン
トであるポリプロピレンを用いた他は使用例１と
同様の方法により２軸延伸フイルムを得た。
使用例 ２
ポリプロピレンとしてメルトフロー．レイトが
2.1、沸騰ヘプタン不溶部のアイソタクチツク．
ペンタツド分率が0.963、沸騰ヘプタン可溶部の
含有量が7.5重量パーセントであるものを用いた
他は使用例１と同様な方法で２軸延伸フイルムを
製作した。
比較例 ２
ポリプロピレンとしてメルトフロー．レイト
2.2、沸騰ヘプタン不溶部のアイソタクチツク．
ペンタツド分率が0.946、沸騰ヘプタン可溶部含
有率が7.0重量パーセントであるポリプロピレン
を用いた他は実施例１と同様の方式により２軸延
伸フイルムを製作した。
以上のようにして製作した使用例１、２および
比較例１、２のよる２軸延伸フイルムを用い以下
表１に示す供試コンデンサを製作し、試験に供し
た。
供試コンデンサ
(1) 紙／フイルムコンデンサ
22μm厚さの２軸延伸ポリプロピレンフイル
ム２枚の間に22μm厚さ、密度0.83ｇ／cm3の絶
縁紙を１枚挿入して形成した誘電体を、アルミ
ニウム箔よりなる電極の間に配設したコンデン
サ素子を製作し、加熱、減圧、乾燥後、後記の
表１に示す絶縁油を含浸してコンデンサとし
た。コンデンサ容量は50KVAである。
(2) オールフイルムコンデンサ
アルミニウム箔よりなる電極の間に22μm厚
さの２軸延伸ポリプロピレンフイルム３枚によ
り形成した誘電体を、アルミニウム箔よりなる
電極の間に配設したコンデンサ素子を製作し、
加熱、減圧、乾燥後表１に示す絶縁油を含浸し
てコンデンサとした。コンデンサ容量は
50KVAである。
The present invention relates to insulation of oil-filled electrical equipment. In oil-filled electrical equipment, such as oil-filled capacitors and oil-filled cables, there has recently been a trend to use plastic film or tape for insulation instead of conventional insulating paper such as kraft paper. However, for example, when a capacitor element is wound using polypropylene film and aluminum foil and immersed in insulating oil, the polypropylene film has a high solubility in aromatic insulating oil, for example.
Swelling occurs, making it difficult to achieve smaller size and longer life. Similar problems of dissolution and swelling occur in oil-filled cables in which an insulating layer is formed by winding a polypropylene tape as described above on a cable conductor. The present invention provides isotactic treatment of the boiling heptane insoluble portion of polypropylene. Pentad fraction is 0.955,
Using a film obtained by biaxially stretching polypropylene, preferably 0.96 or more, and the content of the boiling heptane soluble portion of the polypropylene is 9.0% by weight, preferably 8.0% by weight or less,
An oil-filled electrical device characterized by forming an insulating layer of a capacitor element or a cable. First, the isotactic treatment of the boiling heptane insoluble portion of the polypropylene described above. The pentad fraction and the content of boiling heptane soluble parts are determined as follows. Boil 5g of polypropylene with 500ml of xylene
After completely dissolving the mixture, lower the temperature to 20°C and leave it for 4 hours. Thereafter, it is filtered and separated into a xylene soluble part and an insoluble part at 20°C. Next, the xylene-insoluble portion at 20° C. is further extracted with boiling heptane for 8 hours using a Soxhlet extractor to separate it into an extraction residue and an extract. This extraction residue is used as the boiling heptane insoluble part. The value obtained by subtracting this dry weight from the total polypropylene weight subjected to measurement and dividing by the total polypropylene weight, expressed as a weight percentage, is the content of the boiling heptane soluble portion. Isotactic. What is pentad fraction?A.
Macromolecules 6 , 925 by Zambelli et al.
(1973), i.e. 13 C
- Isotactic chain of pentad units of polypropylene molecular chain measured using NMR, in other words, it is the fraction of propylene monomer units at the center of a chain of five consecutive meso-bonded propylene monomer units. Polypropylene melt used in the present invention. The flow rate may be within the range used in the stretched film field, but may also be within the range of JIS K 7210.
A value in the range of 0.3 to 6 as measured at 230° C. in 1976 is preferred. Further, the polypropylene biaxially stretched film used in the present invention may contain a heat stabilizer, an antioxidant, and other additives, if necessary. Furthermore, in the present invention, the method of biaxially stretching polypropylene is a method usually used industrially,
For example, a stretching machine such as a tenter type or a tubular type can be used. Examples of the use of the polypropylene film used in the oil-filled electrical equipment of the present invention will be described below. Usage example 1 Melt flow rate is 2.0, isotactic of boiling heptane insoluble area. Pentad fraction is 0.965,
Polypropylene with a boiling heptane soluble content of 6.8% by weight and 0.2% phenolic stabilizer
Add weight percent, use T-die extruder, 290
Melt extrusion was carried out at 0.degree. C. and then cooled with a cooling roll to obtain a sheet with a thickness of 1.2 mm. This sheet was stretched 5.5 times in one direction using rolls with a surface temperature of 150°C, and was then stretched 5.5 times in one direction using a tenter-type stretching machine (165
℃) in the direction perpendicular to the direction of the first stage.
Double-stretched and heat treated at 135°C to a thickness of 22 μm.
An axially stretched polypropylene film was obtained. Comparative example 1 Melt flow. Rate 2.0, isotactic of boiling heptane insoluble part. Pentad fraction 0.950,
A biaxially stretched film was obtained in the same manner as in Use Example 1, except that polypropylene having a boiling heptane soluble content of 11.2% by weight was used. Usage example 2 Melt flow as polypropylene. Late is
2.1. Isotactics of the insoluble part of boiling heptane.
A biaxially stretched film was produced in the same manner as in Use Example 1, except that a film having a pentad fraction of 0.963 and a boiling heptane soluble portion content of 7.5 weight percent was used. Comparative Example 2 Melt flow as polypropylene. Late
2.2. Isotactics of the insoluble part of boiling heptane.
A biaxially stretched film was produced in the same manner as in Example 1, except that polypropylene having a pentad fraction of 0.946 and a boiling heptane soluble content of 7.0 weight percent was used. Using the biaxially stretched films of Usage Examples 1 and 2 and Comparative Examples 1 and 2 produced as described above, test capacitors shown in Table 1 below were produced and subjected to testing. Test capacitor (1) Paper/film capacitor A dielectric material formed by inserting a sheet of insulating paper with a thickness of 22 μm and a density of 0.83 g/cm 3 between two sheets of biaxially stretched polypropylene film with a thickness of 22 μm was formed using aluminum. A capacitor element disposed between electrodes made of foil was manufactured, heated, depressurized, dried, and impregnated with insulating oil shown in Table 1 below to prepare a capacitor. Capacitor capacity is 50KVA. (2) All-film capacitor A capacitor element was manufactured in which a dielectric material made of three 22 μm thick biaxially stretched polypropylene films was placed between electrodes made of aluminum foil, and a dielectric material was placed between electrodes made of aluminum foil.
After heating, reducing pressure, and drying, the capacitor was impregnated with the insulating oil shown in Table 1 to prepare a capacitor. The capacitor capacity is
It is 50KVA.
【表】【table】
【表】
前記実施例１〜９および比較例３〜８による
50KVAの油入コンデンサを90℃雰囲気中で1.5E
（Ｅは定格電圧）の交流電圧を連続印加し、その
残存率を求めた。第１図にはその結果が示されて
いる。図より明らかなように本発明による実施例
によれば、150日を経過しても破壊することがな
いことを示している。
表２には本発明の使用例１、２および比較例
１、２で製作した２軸延伸フイルムの特性値が示
される。[Table] According to Examples 1 to 9 and Comparative Examples 3 to 8
50KVA oil-filled capacitor at 1.5E in 90℃ atmosphere
An alternating current voltage of (E is the rated voltage) was continuously applied, and the residual rate was determined. The results are shown in FIG. As is clear from the figure, the example according to the present invention does not break even after 150 days. Table 2 shows the characteristic values of the biaxially stretched films produced in Use Examples 1 and 2 of the present invention and Comparative Examples 1 and 2.
【表】
なお表２における項目(イ)はメルトフロー．レイ
ト（ｇ／10分）を、(ロ)は沸騰ヘペタン不溶部アイ
ソタクチツク．ペンタツド分率を、(ハ)は沸騰ヘプ
タン可溶部含有量（重量パーセント）を示し、ま
た難燃油ＡはTCP／AN＝50／50（重量パーセン
ト）、ＢはTCP／DTE＝50／50（重量パーセント）
である。
また、表２の２軸延伸フイルムの膨潤度（重量
％）は100℃中で40時間浸漬後の重量変化を示す
ものである。
表２より比較例１、２によるものは本発明の使
用例によるものと対比して膨潤が大きいことが理
解される。このような現象はすでに説明したとこ
ろから理解できるように、沸騰ヘプタン不溶部の
アイソタクチツク．ペンタツド分率および沸騰ヘ
プタン可溶部含有量の差によつて生じるのである
が、例えば、沸騰ヘプタン可溶部含有率だけが
9.0重量パーセント以下であつても大きな膨潤を
生じるのであつて、すでに述べたように、特に沸
騰ヘプタン不溶部アイソタクチツク．ペンタツド
分率および沸騰ヘプタン可溶部含有量（重量パー
セント）から本発明において使用されるポリプロ
ピレンの特性が規定されるのである。
以上、油入コンデンサについて説明したが、導
体に絶縁紙を巻回し、油漬の状態で使用するよう
な油入電力ケーブルにおいても絶縁紙にかえてプ
ラスチツクテープを巻回した場合、同様に膨潤の
問題が生じる。従つて、本発明の使用例１、２に
よるフイルムよりテープを作り、厚みのある絶縁
層を絶縁紙および本発明の上記の使用例によるテ
ープを交互に導体上に巻回すれば、導体と絶縁層
外表部との間に油通間隙を有するケーブルを形成
することができ、膨潤のすくない油入電力ケーブ
ルを得ることができる。[Table] Item (a) in Table 2 is melt flow. rate (g/10 min), (b) isotactic boiling hepetane insoluble part. Pentad fraction, (c) shows boiling heptane soluble content (weight percent), and flame retardant oil A is TCP/AN=50/50 (weight percent), B is TCP/DTE=50/50 (weight percent). weight percent)
It is. Further, the degree of swelling (weight %) of the biaxially stretched film in Table 2 indicates the change in weight after 40 hours of immersion at 100°C. It can be seen from Table 2 that the samples according to Comparative Examples 1 and 2 have larger swelling compared to the samples according to the usage examples of the present invention. As can be understood from the above explanation, this phenomenon is caused by the isotactic nature of the insoluble portion of boiling heptane. This is caused by the difference in the pentad fraction and the soluble content of boiling heptane; for example, only the soluble content of boiling heptane
Even if the concentration is less than 9.0% by weight, large swelling will occur, and as mentioned above, especially in boiling heptane insoluble isotactics. The pentad fraction and boiling heptane soluble content (weight percent) define the properties of the polypropylene used in the present invention. The above explanation was about oil-immersed capacitors, but oil-immersed power cables where the conductor is wrapped with insulating paper and used while immersed in oil also have the same swelling problem when wrapped with plastic tape instead of the insulating paper. occurs. Therefore, if a tape is made from the films according to Usage Examples 1 and 2 of the present invention, and a thick insulating layer is wound around a conductor alternately with insulating paper and the tape according to the above Usage Examples of the present invention, it is possible to insulate the conductor. A cable having an oil passage gap between the layer and the outer surface can be formed, and an oil-filled power cable with little swelling can be obtained.
第１図は本発明の１実施例によるコンデンサと
従来のコンデンサの残存率結果を示すグラフであ
る。
FIG. 1 is a graph showing the survival rate results of a capacitor according to an embodiment of the present invention and a conventional capacitor.
Claims (1)
溶部のアイソタクチツク．ペンタツド分率が
0.955以上で、沸騰ヘプタン可溶部の含有量が9.0
重量パーセント以下であるポリプロピレンより得
られる２軸延伸フイルムを用いることを特徴とす
る油入電気機器。1. Isotactic insoluble portion of boiling heptane in at least a portion of the insulating layer. The pentad fraction is
0.955 or higher, the boiling heptane soluble content is 9.0
An oil-filled electrical device characterized by using a biaxially stretched film obtained from polypropylene having a weight percent or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3512780A JPS56131921A (en) | 1980-03-19 | 1980-03-19 | Oil-immersed electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3512780A JPS56131921A (en) | 1980-03-19 | 1980-03-19 | Oil-immersed electric device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56131921A JPS56131921A (en) | 1981-10-15 |
| JPS631735B2 true JPS631735B2 (en) | 1988-01-13 |
Family
ID=12433262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3512780A Granted JPS56131921A (en) | 1980-03-19 | 1980-03-19 | Oil-immersed electric device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56131921A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5963609A (en) * | 1982-10-05 | 1984-04-11 | 三井東圧化学株式会社 | Electrically insulating material made of biaxially oriented polypropylene film |
| JPS59211908A (en) * | 1983-05-17 | 1984-11-30 | 株式会社東芝 | Oil-filled film capacitor |
| EP2383300B1 (en) | 2009-01-27 | 2016-10-12 | Mitsui Chemicals, Inc. | Propylene homopolymer for condensers |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5026100A (en) * | 1973-07-09 | 1975-03-18 | ||
| JPS5147105A (en) * | 1974-10-17 | 1976-04-22 | Hitachi Cable | GOSEIZE TSUENSHI |
| JPS51109982A (en) * | 1975-02-28 | 1976-09-29 | Gen Electric | |
| JPS5243867A (en) * | 1975-10-06 | 1977-04-06 | Mitsubishi Rayon Co | Method of producing translucent film formed article |
| JPS52140000A (en) * | 1976-05-17 | 1977-11-22 | Mitsubishi Rayon Co | Method of manufacturing polypropylene for electric equipment |
| JPS5333289A (en) * | 1976-09-08 | 1978-03-29 | Sumitomo Chem Co Ltd | Preparation of highly crystalline olefin polymer |
| JPS5342269A (en) * | 1976-09-30 | 1978-04-17 | Honshu Paper Co Ltd | Method of producing stretching polypropylene film |
| JPS6214564A (en) * | 1985-07-11 | 1987-01-23 | Nec Corp | Originating call control system |
-
1980
- 1980-03-19 JP JP3512780A patent/JPS56131921A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5026100A (en) * | 1973-07-09 | 1975-03-18 | ||
| JPS5147105A (en) * | 1974-10-17 | 1976-04-22 | Hitachi Cable | GOSEIZE TSUENSHI |
| JPS51109982A (en) * | 1975-02-28 | 1976-09-29 | Gen Electric | |
| JPS5243867A (en) * | 1975-10-06 | 1977-04-06 | Mitsubishi Rayon Co | Method of producing translucent film formed article |
| JPS52140000A (en) * | 1976-05-17 | 1977-11-22 | Mitsubishi Rayon Co | Method of manufacturing polypropylene for electric equipment |
| JPS5333289A (en) * | 1976-09-08 | 1978-03-29 | Sumitomo Chem Co Ltd | Preparation of highly crystalline olefin polymer |
| JPS5342269A (en) * | 1976-09-30 | 1978-04-17 | Honshu Paper Co Ltd | Method of producing stretching polypropylene film |
| JPS6214564A (en) * | 1985-07-11 | 1987-01-23 | Nec Corp | Originating call control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56131921A (en) | 1981-10-15 |
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