DE3212864C2 - Hitzebeständiges Polyesterimidharz und Verfahren zu seiner Herstellung - Google Patents
Hitzebeständiges Polyesterimidharz und Verfahren zu seiner HerstellungInfo
- Publication number
- DE3212864C2 DE3212864C2 DE3212864A DE3212864A DE3212864C2 DE 3212864 C2 DE3212864 C2 DE 3212864C2 DE 3212864 A DE3212864 A DE 3212864A DE 3212864 A DE3212864 A DE 3212864A DE 3212864 C2 DE3212864 C2 DE 3212864C2
- Authority
- DE
- Germany
- Prior art keywords
- resin
- acid
- heat
- weight
- diisocyanate
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/285—Nitrogen containing compounds
- C08G18/2855—Lactams
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/343—Polycarboxylic acids having at least three carboxylic acid groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/14—Polyamide-imides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
- H01B3/306—Polyimides or polyesterimides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/308—Wires with resins
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
- Polyurethanes Or Polyureas (AREA)
- Organic Insulating Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Paints Or Removers (AREA)
Abstract
Description
(b) eines Diisocyanats,
so 8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß das Äquivalentverhältnis von (B)/(C) 0,6 bis
Bezugsbeispiel 1 | g | Mol | |
Bestandteile | 518,9 113,0 92.0 0,72 38.0 |
2,67 1,83 1,0 |
|
Dimethylterephthalat Äthylenglykol Glycerin Tetrabutyltitanat (Katalysator) Cresol |
|||
Bezugsbeispiel 2 | Bestandteile | g | Mol |
Dimethylterephthalat Äthylenglykol Tris-(2-hydroxyäthyl)-isocyanurat Tetrabutyltitanat Cresol |
426,8 62,0 323.6 0,81 91,0 |
2,20 1,0 1.24 |
|
Bestandteile | g | 50,0 | Äquivalent |
Polyisocyanat, welches einen Isocyanuratring | 0,15 | ||
enthält und gemäß Bezugsbeispiel 3 | |||
synthetisiert wurde | 113,3 | ||
4,4'-Diphenylmeihandiisocyanat | 115,2 | 0,91 | |
Trimellithsäureanhydrid | 39,6 | 1,20 | |
f-Caprolactam | 278.5 | 0,70 | |
Cresol |
245,0 | 2,53 |
263,7 | 3,04 |
0,7 |
Bestandteile | g | 6,3 | Äquivalent |
Trimesinsäure | IU | 0,09 | |
33\4,4'-Benzophenontetracarbonsäuredianhydrid | 33,9 | Ö.Ö7 | |
«•-Caprolactam | 125.0 | 0,60 | |
4,4'-Diphenylmethandiisocyanat | 91.2 | 1,00 | |
Trimellithsäureanhydrid | 185.0 | 0,95 | |
Cresol | 10.0 | ||
Xylol |
194,0 | 2.00 |
12,4 | 0,40 |
174,0 | 2,00 |
0,4 |
4,4'-Diphenylmethandiisocyanat | 110,0 | 0,88 |
f-Caprolactam | 36,7 | 0,65 |
Trimellithsäureanhydrid | 97,0 | 1,01 |
Tris-(2-carboxyäthyl)-isocyanurat | 2,3 | 0,02 |
Polyisocyanat, das einen Isocyanuratring | 40.0 | 0,12 |
enthält und gemäß Bezugsbeispiel 3 | ||
synthetisiert wurde | ||
Cresol | 250.0 |
485,0 | 5.00 |
522,0 | 6,00 |
31,0 | 1,00 |
1,3 |
4,4'-Diphenylmethandiisocyanat | 117,5 | 0,94 |
Polyisocyanat, welches einen Isocyanuratring | 26,7 | 0,08 |
enthält und gemäß Bezugsbeispiel 3 | ||
synthetisiert worden ist | ||
t-Caprolactam | 36.7 | 0.65 |
Trimellithsäureanhydrid | 96.0 | 1.00 |
Cresol | 180,0 | |
Xylol | 10,0 |
38,8 | 0,40 |
43,5 | 0,50 |
0,2 |
85,4 | 0,9 |
45.2 | 0,8 |
125,0 | 1.0 |
153,0 |
145.5 | 1.5 |
226.2 | 2.6 |
0.5 |
90,7 | 0,945 |
36.7 | 0,650 |
123 | 0.105 |
125,0 | 1,000 |
216,6 |
236.8 | 2,44 |
254,8 | 2,93 |
0,7 |
Mandrel-Test | IxOK | IxOK | IxOK | IxOK | JxOK |
Belastung 600 g (wie
derholte Kratzzeit) |
68 | 108 | 70 | 45 | 105 |
9.8 | 11.4 | 9.6 | 6,1 | 11.0 |
74.8 | 88.4 | 74.4 | 46.2 | 853 |
371 | 375 | 370 | 380 | 368 |
gut | gut | gut | gut | gut |
gut | gut | gut | Blasen | gut |
bildung |
Tabelle I (Fortsetzung) | Testbedingungen | Beispiel 6 | 864 | Beispiel 8 |
Bezugs
beispiel 1 |
Bezugs
beispiel 2 |
5 | |
32 12 | Eigenschaften | Mandrel-Test | IxOK | IxOK | IxOK | IxOK | ||
Flexibilität | Belastung 600 g (wie | 65 | Beispiel 7 | 140 | 40 | 35 | ||
Abriebsbestän | derholte Kratzzeit) | IxOK | 10 | |||||
digkeit | 55 | |||||||
Temperatur, bei der | 220 | 300 | 130 | 160 | ||||
Hitzeschock | der Mandrel-Test nach | |||||||
beständigkeit | Alterung während 1 h | 200 | ||||||
bestanden wird (° C) | 15 | |||||||
Normalzustand (kV) | 12,8 | 13.0 | 12,7 | RO | ||||
Dielektrische | ||||||||
Durchschlag | 13.0 | |||||||
festigkeit | Nach Hitzealterung bei | 9,6 | 12.6 | 1,6 | 4,2 | 20 | ||
240° C während 168 h (kV) | ||||||||
Retentionsrate{%) | 75.0 | 8,8 | 96,9 | 13 | 35 | |||
Durchschneidtemperatur | 342 | 395 | 330 | 370 | ||||
Durchschneid | Belastung 70Og(0C) | 67,7 | 25 | |||||
beständigkeit | 375 | |||||||
IEEE Nr.57 | ||||||||
Hitzebeständig | ||||||||
keit | Gebrauchstest | |||||||
durchschnitt!. | 390 | 980 | 80 | 260 | 30 | |||
Gebrauchszeit | ||||||||
bei 260° C (h) | 440 | |||||||
durchschnittl. | 1450 | 2620 | 230 | 950 | ||||
Gebrauchszeit | ||||||||
bei 240° C (h) | 1600 | 35 | ||||||
Retentionsrate')(%) | 52 | 91 | 25 | 40 | ||||
Hydrolyse | ||||||||
beständigkeit | C4CIF22) Blasentest | 71 | 40 | |||||
Beständigkeit | ||||||||
gegenüber CI2F2 | Blasenbildung | |||||||
1200C-IO min | gut | gut | Blasen | Blasen | ||||
bildung | bildung | |||||||
Temperatur | gut | 45 | ||||||
1300C-IO min | gut | gut | Blasen | Blasen | ||||
bildung | bildung | |||||||
150"C-IO min | Blasen | gut | gut | Blasen | Blasen | |||
bildung | bildung | bildung | 50 | |||||
Blasen | 55 | |||||||
bildung | 60 | |||||||
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56052108A JPS5836018B2 (ja) | 1981-04-06 | 1981-04-06 | 耐熱性樹脂の製造法 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3212864A1 DE3212864A1 (de) | 1982-10-28 |
DE3212864C2 true DE3212864C2 (de) | 1985-09-19 |
Family
ID=12905660
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3249497A Expired DE3249497C2 (de) | 1981-04-06 | 1982-04-06 | Verfahren zur Herstellung einer hitzebeständigen Harzzusammensetzung und die Verwendung des bei dem Verfahren erhaltenen Produkts zur Herstellung eines isolierten Leiters |
DE3212864A Expired DE3212864C2 (de) | 1981-04-06 | 1982-04-06 | Hitzebeständiges Polyesterimidharz und Verfahren zu seiner Herstellung |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3249497A Expired DE3249497C2 (de) | 1981-04-06 | 1982-04-06 | Verfahren zur Herstellung einer hitzebeständigen Harzzusammensetzung und die Verwendung des bei dem Verfahren erhaltenen Produkts zur Herstellung eines isolierten Leiters |
Country Status (5)
Country | Link |
---|---|
US (2) | US4431758A (de) |
JP (1) | JPS5836018B2 (de) |
DE (2) | DE3249497C2 (de) |
FR (1) | FR2503171B1 (de) |
GB (1) | GB2098618B (de) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2503723B1 (fr) * | 1981-04-08 | 1986-10-24 | Hitachi Chemical Co Ltd | Composition de resine resistante a la chaleur et fils isoles avec cette composition |
JPS59143618U (ja) * | 1983-03-12 | 1984-09-26 | 三菱マテリアル株式会社 | 2枚刃ガンドリル |
JPS6017911U (ja) * | 1983-07-13 | 1985-02-06 | 三菱マテリアル株式会社 | ドリル |
DE3332031A1 (de) * | 1983-09-06 | 1985-03-21 | Bayer Ag, 5090 Leverkusen | Verwendung von polyamidimiden als thermoplaste |
DE3332032A1 (de) * | 1983-09-06 | 1985-03-21 | Bayer Ag, 5090 Leverkusen | Spezielle polyamidimide |
DE3332030A1 (de) * | 1983-09-06 | 1985-03-21 | Bayer Ag, 5090 Leverkusen | Verfahren zur herstellung von polyamidimiden |
DE3332033A1 (de) * | 1983-09-06 | 1985-03-21 | Bayer Ag, 5090 Leverkusen | Neue polyamidimide und ihre verwendung |
IT1178724B (it) * | 1984-12-06 | 1987-09-16 | Pirelli Cavi Spa | Cavo elettrico per bassa tensione |
US5286812A (en) * | 1988-02-19 | 1994-02-15 | University Of Massachusetts | High performance blends of aromatic polyimides with aromatic polyethersulfones |
US4856212A (en) * | 1988-08-08 | 1989-08-15 | Joseph Dikoff | Cordless iron with high-temperature, non-scorching sole plate surface |
US5104944A (en) * | 1989-07-18 | 1992-04-14 | International Business Machines Corporation | Process for nucleophilic derivatization of materials having an imide group conjugated to an aromatic moiety |
DE4019026A1 (de) * | 1990-06-14 | 1991-12-19 | Bayer Ag | Beschichtungsmittel und seine verwendung zur beschichtung hitzeresistenter substrate |
DE19524437A1 (de) * | 1995-07-05 | 1997-01-09 | Bayer Ag | Amid-/Imidgruppen-haltige blockierte Polyisocyanate für Drahtlacke |
FR2766834B1 (fr) * | 1997-07-29 | 1999-10-08 | Eurocopter France | Composition adhesive pour le collage a chaud et procede de collage permettant sa mise en oeuvre |
DE19811333A1 (de) * | 1998-03-16 | 1999-09-23 | Herberts Gmbh | Für metallische Leiter geeignete Beschichtungszusammensetzung |
DE10041943A1 (de) * | 2000-08-25 | 2002-03-14 | Schenectady Int Inc | Polyamidimidharzlösung und ihre Verwendung zur Herstellung von Drahtlacken |
JP4542463B2 (ja) * | 2005-04-25 | 2010-09-15 | 日立マグネットワイヤ株式会社 | 耐部分放電性絶縁塗料、絶縁電線、及びそれらの製造方法 |
JP4584014B2 (ja) * | 2005-04-25 | 2010-11-17 | 日立マグネットワイヤ株式会社 | 耐部分放電性絶縁塗料、絶縁電線、及びそれらの製造方法 |
US20080200084A1 (en) * | 2007-02-16 | 2008-08-21 | Angus Richard O | Compositions for thin circuit materials, circuits, multi-layer circuits, and methods of manufacture thereof |
CN102428118B (zh) * | 2009-03-16 | 2016-03-09 | 太阳化学有限公司 | 柔性印刷电路板用液体覆盖层 |
KR101419293B1 (ko) * | 2009-09-30 | 2014-07-14 | 히타치가세이가부시끼가이샤 | 수지 조성물 및 이것을 사용한 프리프레그, 수지 부착 금속박, 접착 필름 및 금속박 적층판 |
WO2011051412A1 (en) * | 2009-10-29 | 2011-05-05 | Sun Chemical B.V. | Polyamideimide adhesives for printed circuit boards |
JP6420171B2 (ja) * | 2015-02-19 | 2018-11-07 | エア・ウォーター株式会社 | ポリアミドイミド樹脂および当該ポリアミドイミド樹脂の製造方法、ならびに熱硬化性樹脂組成物および当該熱硬化性樹脂組成物の硬化物 |
EP3353225B1 (de) * | 2015-09-25 | 2023-05-10 | Huntsman Advanced Materials Licensing (Switzerland) GmbH | Herstellung von polyamidoimiden |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1770202C3 (de) * | 1968-04-13 | 1975-02-27 | Bayer Ag, 5090 Leverkusen | Verfahren zur Herstellung von hochmolekularen Polyamid-tmiden |
DE2542706C3 (de) * | 1975-09-25 | 1981-04-09 | Bayer Ag, 5090 Leverkusen | Verfahren zur Herstellung von Imidgruppen enthaltenden Polykondensaten |
JPS607648B2 (ja) * | 1977-03-01 | 1985-02-26 | 古河電気工業株式会社 | 耐熱性重合体の製造方法 |
JPS5469140A (en) * | 1977-11-14 | 1979-06-02 | Hitachi Chem Co Ltd | Coating compound for electrical insulation |
US4294952A (en) * | 1978-11-30 | 1981-10-13 | Hitachi Chemical Company, Ltd. | Polyamide-imide resin and its production |
JPS55145758A (en) | 1979-04-28 | 1980-11-13 | Hitachi Chem Co Ltd | Polyamideimide resin composition |
JPS55149347A (en) | 1979-05-09 | 1980-11-20 | Hitachi Chem Co Ltd | Polyamide-imide resin composition |
US4269752A (en) * | 1979-05-18 | 1981-05-26 | General Electric Company | Polyester imide wire enamels |
JPS56106974A (en) * | 1980-01-31 | 1981-08-25 | Dainichi Seika Kogyo Kk | Electrical insulation paint |
DE3034536C2 (de) * | 1980-09-12 | 1982-04-08 | Hitachi Chemical Co., Ltd., Tokyo | Polyamid-imidharzmasse und ihre Verwendung |
-
1981
- 1981-04-06 JP JP56052108A patent/JPS5836018B2/ja not_active Expired
-
1982
- 1982-03-31 US US06/363,799 patent/US4431758A/en not_active Expired - Fee Related
- 1982-04-02 FR FR8205793A patent/FR2503171B1/fr not_active Expired
- 1982-04-02 GB GB8209919A patent/GB2098618B/en not_active Expired
- 1982-04-06 DE DE3249497A patent/DE3249497C2/de not_active Expired
- 1982-04-06 DE DE3212864A patent/DE3212864C2/de not_active Expired
-
1983
- 1983-07-28 US US06/518,109 patent/US4448844A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FR2503171B1 (fr) | 1986-04-11 |
DE3249497C2 (de) | 1987-01-15 |
GB2098618A (en) | 1982-11-24 |
GB2098618B (en) | 1985-07-10 |
FR2503171A1 (fr) | 1982-10-08 |
US4448844A (en) | 1984-05-15 |
DE3212864A1 (de) | 1982-10-28 |
JPS5836018B2 (ja) | 1983-08-06 |
US4431758A (en) | 1984-02-14 |
JPS57165450A (en) | 1982-10-12 |
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