CA1051372A - Method of curing organosiloxane compositions using microwaves - Google Patents
Method of curing organosiloxane compositions using microwavesInfo
- Publication number
- CA1051372A CA1051372A CA254,235A CA254235A CA1051372A CA 1051372 A CA1051372 A CA 1051372A CA 254235 A CA254235 A CA 254235A CA 1051372 A CA1051372 A CA 1051372A
- Authority
- CA
- Canada
- Prior art keywords
- radicals
- organosiloxane
- silicon
- bonded
- aliphatic hydrocarbon
- 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
- 239000000203 mixture Substances 0.000 title claims abstract description 68
- 125000005375 organosiloxane group Chemical group 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 11
- -1 aliphatic hydrocarbon radicals Chemical class 0.000 claims abstract description 47
- 150000003254 radicals Chemical class 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 15
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 6
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 3
- 150000005840 aryl radicals Chemical class 0.000 claims abstract description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 3
- 125000003396 thiol group Chemical group [H]S* 0.000 claims abstract description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 23
- 229910052697 platinum Inorganic materials 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 239000003060 catalysis inhibitor Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 125000004429 atom Chemical group 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000003431 cross linking reagent Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 150000001451 organic peroxides Chemical class 0.000 claims description 2
- 150000002611 lead compounds Chemical class 0.000 claims 1
- 239000011347 resin Substances 0.000 abstract description 10
- 229920005989 resin Polymers 0.000 abstract description 10
- 229920001971 elastomer Polymers 0.000 abstract description 9
- 239000000806 elastomer Substances 0.000 abstract description 8
- 238000001723 curing Methods 0.000 description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 239000010453 quartz Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000003377 acid catalyst Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 125000005388 dimethylhydrogensiloxy group Chemical group 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 238000013007 heat curing Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 1
- MFEVGQHCNVXMER-UHFFFAOYSA-L 1,3,2$l^{2}-dioxaplumbetan-4-one Chemical compound [Pb+2].[O-]C([O-])=O MFEVGQHCNVXMER-UHFFFAOYSA-L 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$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
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229910000003 Lead carbonate Inorganic materials 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 229960002380 dibutyl phthalate Drugs 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- DSSXKBBEJCDMBT-UHFFFAOYSA-M lead(2+);octanoate Chemical compound [Pb+2].CCCCCCCC([O-])=O DSSXKBBEJCDMBT-UHFFFAOYSA-M 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000011415 microwave curing Methods 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 150000003057 platinum Chemical class 0.000 description 1
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Chemical group 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
-
- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
-
- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/24—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen halogen-containing 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/28—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen sulfur-containing 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/70—Siloxanes defined by use of the MDTQ nomenclature
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/614,466 US4011197A (en) | 1975-09-18 | 1975-09-18 | Method of curing organosiloxane compositions using microwaves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051372A true CA1051372A (en) | 1979-03-27 |
Family
ID=24461369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA254,235A Expired CA1051372A (en) | 1975-09-18 | 1976-06-07 | Method of curing organosiloxane compositions using microwaves |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4011197A (enExample) |
| JP (1) | JPS5237966A (enExample) |
| BE (1) | BE846261A (enExample) |
| CA (1) | CA1051372A (enExample) |
| DE (1) | DE2638471C3 (enExample) |
| FR (1) | FR2324674A1 (enExample) |
| GB (1) | GB1556198A (enExample) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2529215B1 (fr) * | 1982-06-28 | 1987-05-07 | Electricite De France | Procede de preparation de reseaux polymeres de structure interpenetree homogene |
| US4512942A (en) * | 1983-06-13 | 1985-04-23 | B. F. Goodrich Company | Method and apparatus for vulcanizing hose |
| EP0184598A1 (en) * | 1984-12-06 | 1986-06-18 | Toray Silicone Company Limited | Ultraviolet and electron-beam curable polyorganosiloxane composition |
| US4721738A (en) * | 1985-10-07 | 1988-01-26 | Occidental Research Corporation | Polymeric compositions including microwave energy sensitizing additives |
| US4626642A (en) * | 1985-10-08 | 1986-12-02 | General Motors Corporation | Microwave method of curing a thermoset polymer |
| JPH062838B2 (ja) * | 1989-09-19 | 1994-01-12 | 信越化学工業株式会社 | 発泡性シリコーンゴム組成物の発泡、硬化方法および発泡シリコーンゴム硬化物 |
| GB8922046D0 (en) * | 1989-09-29 | 1989-11-15 | Morton Int Ltd | Manufacture of insulated glass units |
| JP2517770B2 (ja) * | 1990-01-26 | 1996-07-24 | 信越化学工業株式会社 | シリコ―ンゴム組成物およびその硬化方法ならびに硬化物 |
| US5346932A (en) * | 1990-01-26 | 1994-09-13 | Shin-Etsu Chemical Co., Ltd. | Silicone rubber composition and method for curing the same |
| US5088179A (en) * | 1990-10-12 | 1992-02-18 | Jmk International, Inc. | Method of forming a microwaveable container |
| JPH0759244B2 (ja) * | 1990-10-16 | 1995-06-28 | 日東電工株式会社 | 使い捨てオムツの剥離部の構造、及び剥離音を軽減した使い捨てオムツ |
| US5272216A (en) * | 1990-12-28 | 1993-12-21 | Westinghouse Electric Corp. | System and method for remotely heating a polymeric material to a selected temperature |
| US5446075A (en) * | 1993-04-01 | 1995-08-29 | Jmk International, Inc. | Monitor putty |
| US5472994A (en) * | 1993-04-01 | 1995-12-05 | Jmk International, Inc. | Microwave-heatable exercise putty |
| US5693689A (en) * | 1993-04-01 | 1997-12-02 | Jmk International, Inc. | Monitor putty with increasing stiffness |
| JP3077879B2 (ja) * | 1994-02-15 | 2000-08-21 | インターナショナル・ビジネス・マシーンズ・コーポレ−ション | ウェブ・タイプの定量された処理材料にマイクロ波エネルギーを印加するための装置及び方法 |
| GB9520280D0 (en) * | 1995-10-04 | 1995-12-06 | Dow Corning Gmbh | Curable compositions |
| DE19855718C2 (de) * | 1998-06-15 | 2003-02-06 | Rcc Polymertechnik Gmbh | Verfahren zur kontinuierlichen Vernetzung von reaktiven additionsvernetzbaren Flüssigsiliconkautschuksystem durch Einwirkung von Mikrowellen zur Herstellung von Elastomer-Formkörpern |
| US6605651B1 (en) * | 1998-09-09 | 2003-08-12 | Biomat Sciences, Inc. | Curing methods and material compositions having dental and other applications |
| WO2000018191A1 (en) * | 1998-09-18 | 2000-03-30 | Marc Seghatol | Microwave polymerization system for dentistry |
| US6368994B1 (en) | 1999-12-27 | 2002-04-09 | Gyrorron Technology, Inc. | Rapid processing of organic materials using short wavelength microwave radiation |
| DE102004053310A1 (de) * | 2004-11-04 | 2006-05-11 | Wacker Chemie Ag | Mikrowellenaktive Siliconelastomere |
| GB2431173B (en) * | 2005-09-15 | 2010-01-13 | Alexium Ltd | Method for attachment of silicon-containing compounds to a surface |
| US8815351B2 (en) * | 2005-09-15 | 2014-08-26 | The United States Of America As Represented By The Secretary Of The Air Force | Method for attachment of silicon-containing compounds to a surface and for synthesis of hypervalent silicon-compounds |
| US7618349B1 (en) | 2006-02-02 | 2009-11-17 | Aaron Muderick | Therapeutic putty with increasing or decreasing stiffness |
| KR20100099136A (ko) * | 2007-10-26 | 2010-09-10 | 다우 코닝 도레이 캄파니 리미티드 | 실리콘 고무 부재의 접착 방법 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE542995A (enExample) * | 1954-11-23 | |||
| NL129346C (enExample) * | 1966-06-23 | |||
| GB1313102A (en) * | 1969-07-04 | 1973-04-11 | Int Synthetic Rubber | Process for producing moulded foam |
| US3666830A (en) * | 1971-01-21 | 1972-05-30 | Gen Electric | Lead compound catalyzed siloxane resin system |
-
1975
- 1975-09-18 US US05/614,466 patent/US4011197A/en not_active Expired - Lifetime
-
1976
- 1976-06-07 CA CA254,235A patent/CA1051372A/en not_active Expired
- 1976-07-07 GB GB28225/76A patent/GB1556198A/en not_active Expired
- 1976-08-04 JP JP51093113A patent/JPS5237966A/ja active Granted
- 1976-08-26 DE DE2638471A patent/DE2638471C3/de not_active Expired
- 1976-09-16 BE BE170671A patent/BE846261A/xx not_active IP Right Cessation
- 1976-09-16 FR FR7627879A patent/FR2324674A1/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2638471A1 (de) | 1977-03-24 |
| BE846261A (fr) | 1977-03-16 |
| FR2324674A1 (fr) | 1977-04-15 |
| JPS531309B2 (enExample) | 1978-01-18 |
| DE2638471C3 (de) | 1978-11-09 |
| JPS5237966A (en) | 1977-03-24 |
| GB1556198A (en) | 1979-11-21 |
| US4011197A (en) | 1977-03-08 |
| FR2324674B1 (enExample) | 1979-08-31 |
| DE2638471B2 (de) | 1978-03-16 |
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