SE459735B - Gasfasmetod foer framstaellning av elastomera sampolymerer av eten och hoegre alfa-olefiner - Google Patents
Gasfasmetod foer framstaellning av elastomera sampolymerer av eten och hoegre alfa-olefinerInfo
- Publication number
- SE459735B SE459735B SE8204841A SE8204841A SE459735B SE 459735 B SE459735 B SE 459735B SE 8204841 A SE8204841 A SE 8204841A SE 8204841 A SE8204841 A SE 8204841A SE 459735 B SE459735 B SE 459735B
- Authority
- SE
- Sweden
- Prior art keywords
- catalyst
- vanadium
- acac
- ethylene
- compound
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 57
- 229920001971 elastomer Polymers 0.000 title description 13
- 239000000806 elastomer Substances 0.000 title description 8
- 239000003054 catalyst Substances 0.000 claims description 119
- 239000007789 gas Substances 0.000 claims description 43
- 239000000178 monomer Substances 0.000 claims description 37
- 238000006116 polymerization reaction Methods 0.000 claims description 37
- 229910052782 aluminium Inorganic materials 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 32
- 238000006243 chemical reaction Methods 0.000 claims description 30
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 28
- 239000005977 Ethylene Substances 0.000 claims description 28
- 229910052720 vanadium Inorganic materials 0.000 claims description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- -1 vanadium salt compound Chemical class 0.000 claims description 22
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 15
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- 230000008569 process Effects 0.000 claims description 11
- 239000004711 α-olefin Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 150000003682 vanadium compounds Chemical class 0.000 claims description 10
- 125000001931 aliphatic group Chemical group 0.000 claims description 8
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 8
- 229910052809 inorganic oxide Inorganic materials 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 239000004215 Carbon black (E152) Substances 0.000 claims description 7
- 229930195733 hydrocarbon Natural products 0.000 claims description 7
- 238000007334 copolymerization reaction Methods 0.000 claims description 5
- 150000003681 vanadium Chemical class 0.000 claims description 5
- 239000002879 Lewis base Substances 0.000 claims description 4
- 229910021551 Vanadium(III) chloride Inorganic materials 0.000 claims description 4
- 125000005595 acetylacetonate group Chemical group 0.000 claims description 4
- 239000012876 carrier material Substances 0.000 claims description 4
- 229920001198 elastomeric copolymer Polymers 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- HQYCOEXWFMFWLR-UHFFFAOYSA-K vanadium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[V+3] HQYCOEXWFMFWLR-UHFFFAOYSA-K 0.000 claims description 4
- MFWFDRBPQDXFRC-LNTINUHCSA-N (z)-4-hydroxypent-3-en-2-one;vanadium Chemical compound [V].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O MFWFDRBPQDXFRC-LNTINUHCSA-N 0.000 claims description 3
- 150000007527 lewis bases Chemical group 0.000 claims description 3
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- 231100000614 poison Toxicity 0.000 claims description 3
- 239000002574 poison Substances 0.000 claims description 3
- OJOWICOBYCXEKR-KRXBUXKQSA-N (5e)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical group C1C2C(=C/C)/CC1C=C2 OJOWICOBYCXEKR-KRXBUXKQSA-N 0.000 claims description 2
- POILWHVDKZOXJZ-ARJAWSKDSA-M (z)-4-oxopent-2-en-2-olate Chemical compound C\C([O-])=C\C(C)=O POILWHVDKZOXJZ-ARJAWSKDSA-M 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- CUJRVFIICFDLGR-UHFFFAOYSA-N acetylacetonate Chemical compound CC(=O)[CH-]C(C)=O CUJRVFIICFDLGR-UHFFFAOYSA-N 0.000 claims 5
- 208000002874 Acne Vulgaris Diseases 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910021552 Vanadium(IV) chloride Inorganic materials 0.000 claims 1
- 206010000496 acne Diseases 0.000 claims 1
- 239000008246 gaseous mixture Substances 0.000 claims 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims 1
- JTJFQBNJBPPZRI-UHFFFAOYSA-J vanadium tetrachloride Chemical compound Cl[V](Cl)(Cl)Cl JTJFQBNJBPPZRI-UHFFFAOYSA-J 0.000 claims 1
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 44
- 229920000642 polymer Polymers 0.000 description 41
- 239000002245 particle Substances 0.000 description 26
- 229910004298 SiO 2 Inorganic materials 0.000 description 24
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- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 22
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- 238000009826 distribution Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 239000010936 titanium Substances 0.000 description 12
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- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
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- OJOWICOBYCXEKR-APPZFPTMSA-N (1S,4R)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound CC=C1C[C@@H]2C[C@@H]1C=C2 OJOWICOBYCXEKR-APPZFPTMSA-N 0.000 description 7
- CMAOLVNGLTWICC-UHFFFAOYSA-N 2-fluoro-5-methylbenzonitrile Chemical compound CC1=CC=C(F)C(C#N)=C1 CMAOLVNGLTWICC-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
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- WTQBISBWKRKLIJ-UHFFFAOYSA-N 5-methylidenebicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(=C)CC1C=C2 WTQBISBWKRKLIJ-UHFFFAOYSA-N 0.000 description 2
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- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 125000005287 vanadyl group Chemical group 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F210/18—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers with non-conjugated dienes, e.g. EPT rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29553381A | 1981-08-24 | 1981-08-24 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE8204841D0 SE8204841D0 (sv) | 1982-08-24 |
| SE8204841L SE8204841L (sv) | 1983-02-25 |
| SE459735B true SE459735B (sv) | 1989-07-31 |
Family
ID=23138110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8204841A SE459735B (sv) | 1981-08-24 | 1982-08-24 | Gasfasmetod foer framstaellning av elastomera sampolymerer av eten och hoegre alfa-olefiner |
Country Status (10)
Families Citing this family (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579835A (en) * | 1984-12-12 | 1986-04-01 | Exxon Research & Engineering Co. | Polymerization catalyst, production and use |
| US4607019A (en) * | 1984-12-12 | 1986-08-19 | Exxon Research & Engineering Co. | Polymerization catalyst, production and use |
| US4948771A (en) * | 1988-12-07 | 1990-08-14 | Union Carbide Chemicals And Plastics Company Inc. | Ethylene copolymerization catalyst |
| NZ235245A (en) * | 1989-09-11 | 1992-02-25 | Union Carbide Chem Plastic | Epdm rubber and preparation in gas phase fluidised bed using a vanadium containing catalyst system |
| US5030605A (en) * | 1989-12-29 | 1991-07-09 | Union Carbide Chemicals And Plastics Technology Corporation | Catalyst for regulating the molecular weight distribution of ethylene polymers |
| US5317036A (en) * | 1992-10-16 | 1994-05-31 | Union Carbide Chemicals & Plastics Technology Corporation | Gas phase polymerization reactions utilizing soluble unsupported catalysts |
| US5342907A (en) * | 1993-06-28 | 1994-08-30 | Union Carbide Chemicals & Plastics Technology Corporation | Ethylene/propylene copolymer rubbers |
| US5416053A (en) * | 1993-06-28 | 1995-05-16 | Union Carbide Chemicals & Plastics Technology Corporation | Homogenous polyethylenes and ethylene/propylene copolymers rubbers |
| US5332793A (en) * | 1993-06-28 | 1994-07-26 | Union Carbide Chemicals & Plastics Technology Corporation | Ethylene/propylene copolymer rubbers |
| US5480850A (en) * | 1993-06-28 | 1996-01-02 | Union Carbide Chemical & Plastics Technology Corporation | Ethylene/propylene copolymer rubbers |
| US5492986A (en) * | 1994-03-31 | 1996-02-20 | Union Carbide Chemicals & Plastics Technology Corporation | Process for producing homogeneous polyethylenes |
| US5502127A (en) * | 1994-03-31 | 1996-03-26 | Union Carbide Chemicals & Plastics Technology Corporation | Process for production of homogeneous polyethylene |
| US5410003A (en) * | 1994-03-31 | 1995-04-25 | Union Carbide Chemicals & Plastics Technology Corporation | Process for production of homogeneous polyethylenes |
| IT1271278B (it) * | 1994-12-15 | 1997-05-27 | Enichem Elastomers | Sistema catalitico supportato per la produzione di copolimeri etilene propilene |
| US6281306B1 (en) | 1999-12-16 | 2001-08-28 | Univation Technologies, Llc | Method of polymerization |
| CN101724110B (zh) | 2002-10-15 | 2013-03-27 | 埃克森美孚化学专利公司 | 用于烯烃聚合的多催化剂体系和由其生产的聚合物 |
| US7223822B2 (en) | 2002-10-15 | 2007-05-29 | Exxonmobil Chemical Patents Inc. | Multiple catalyst and reactor system for olefin polymerization and polymers produced therefrom |
| US20070073012A1 (en) | 2005-09-28 | 2007-03-29 | Pannell Richard B | Method for seed bed treatment before a polymerization reaction |
| US7985811B2 (en) | 2004-01-02 | 2011-07-26 | Univation Technologies, Llc | Method for controlling sheeting in gas phase reactors |
| US7629422B2 (en) | 2004-12-21 | 2009-12-08 | Univation Technologies, Llc | Process for transitioning between Ziegler-Natta-based and chromium-based catalysts |
| US6987152B1 (en) * | 2005-01-11 | 2006-01-17 | Univation Technologies, Llc | Feed purification at ambient temperature |
| EP1803747A1 (en) | 2005-12-30 | 2007-07-04 | Borealis Technology Oy | Surface-modified polymerization catalysts for the preparation of low-gel polyolefin films |
| TW200936564A (en) | 2007-11-15 | 2009-09-01 | Univation Tech Llc | Methods for the removal of impurities from polymerization feed streams |
| RU2515900C2 (ru) | 2008-12-18 | 2014-05-20 | Юнивейшн Текнолоджиз, Ллк | Способ обработки зародышевого слоя реакции полимеризации |
| ES2823768T3 (es) | 2012-12-28 | 2021-05-10 | Univation Tech Llc | Métodos para integrar la producción de aluminoxano en la producción de catalizador |
| ES2980063T3 (es) | 2014-04-02 | 2024-09-27 | Univation Tech Llc | Composiciones de continuidad y método de polimerización de olefinas usando las mismas |
| US10414843B2 (en) | 2015-03-10 | 2019-09-17 | Univation Technologies, Llc | Spray dried catalyst compositions, methods for preparation and use in olefin polymerization processes |
| CN107531840B (zh) | 2015-04-27 | 2022-11-18 | 尤尼威蒂恩技术有限责任公司 | 具有改进流动特性的负载型催化剂组合物及其制备 |
| EP4210868A1 (en) | 2020-09-14 | 2023-07-19 | Chevron Phillips Chemical Company Lp | Transition metal-catalyzed production of alcohol and carbonyl compounds from hydrocarbons |
| US20240209124A1 (en) | 2021-04-30 | 2024-06-27 | Exxonmobil Chemical Patents Inc. | Processes for transitioning between different polymerization catalysts in a polymerization reactor |
| CN117412994A (zh) | 2021-06-10 | 2024-01-16 | 陶氏环球技术有限责任公司 | 具有改性活性的催化剂组合物和其制备方法 |
| USD1073020S1 (en) * | 2023-09-26 | 2025-04-29 | Delta Faucet Company | Faucet |
| USD1073870S1 (en) * | 2023-09-26 | 2025-05-06 | Delta Faucet Company | Faucet |
| USD1081927S1 (en) * | 2023-09-26 | 2025-07-01 | Delta Faucet Company | Faucet |
| USD1081926S1 (en) * | 2023-09-26 | 2025-07-01 | Delta Faucet Company | Faucet |
| USD1081928S1 (en) * | 2023-09-26 | 2025-07-01 | Delta Faucet Company | Faucet |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7502153A (nl) * | 1974-02-27 | 1975-08-29 | Monsanto Co | Werkwijze voor de regeling van de deeltjes- grootte bij de polymerisatie van alkenen. |
| JPS52141888A (en) * | 1976-05-21 | 1977-11-26 | Nippon I P Rubber Kk | Ethyleneepropylene copolymers rubber |
| JPS5948046B2 (ja) * | 1978-08-17 | 1984-11-24 | 三井化学株式会社 | エチレン共重合ゴム |
| JPS5556111A (en) * | 1978-10-20 | 1980-04-24 | Nippon Oil Co Ltd | Preparation of copolymer |
| JPS5556110A (en) * | 1978-10-20 | 1980-04-24 | Nippon Oil Co Ltd | Preparation of copolymer |
| JPS5573712A (en) * | 1978-11-29 | 1980-06-03 | Nippon Oil Co Ltd | Preparation of copolymer |
| JPS5681311A (en) * | 1979-12-06 | 1981-07-03 | Nippon Oil Co Ltd | Production of polyolefin |
| JPS6042806B2 (ja) * | 1979-12-26 | 1985-09-25 | 日石三菱株式会社 | 共重合体の製造方法 |
-
1981
- 1981-10-28 CA CA000388966A patent/CA1174800A/en not_active Expired
-
1982
- 1982-08-20 GB GB08224059A patent/GB2105355B/en not_active Expired
- 1982-08-21 DE DE19823231198 patent/DE3231198A1/de active Pending
- 1982-08-23 BE BE2/5980A patent/BE894163A/nl not_active IP Right Cessation
- 1982-08-23 IT IT22943/82A patent/IT1152506B/it active
- 1982-08-24 SE SE8204841A patent/SE459735B/sv not_active IP Right Cessation
- 1982-08-24 JP JP57145623A patent/JPS5840308A/ja active Granted
- 1982-08-24 NL NL8203307A patent/NL8203307A/nl not_active Application Discontinuation
- 1982-08-24 AU AU87554/82A patent/AU564574B2/en not_active Ceased
- 1982-08-24 FR FR8214515A patent/FR2511689B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL8203307A (nl) | 1983-03-16 |
| GB2105355B (en) | 1985-05-01 |
| IT8222943A0 (it) | 1982-08-23 |
| SE8204841D0 (sv) | 1982-08-24 |
| GB2105355A (en) | 1983-03-23 |
| DE3231198A1 (de) | 1983-05-11 |
| AU564574B2 (en) | 1987-08-20 |
| AU8755482A (en) | 1983-03-03 |
| CA1174800A (en) | 1984-09-18 |
| FR2511689B1 (fr) | 1986-07-04 |
| SE8204841L (sv) | 1983-02-25 |
| BE894163A (nl) | 1983-02-23 |
| JPS5840308A (ja) | 1983-03-09 |
| FR2511689A1 (fr) | 1983-02-25 |
| JPH0248004B2 (enrdf_load_stackoverflow) | 1990-10-23 |
| IT1152506B (it) | 1987-01-07 |
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| NUG | Patent has lapsed |
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