ES2031800T3 - Componentes de catalizador solido para polimerizacion de olefinas y procedimiento de polimerizacion de olefina utilizando los mismos. - Google Patents
Componentes de catalizador solido para polimerizacion de olefinas y procedimiento de polimerizacion de olefina utilizando los mismos.Info
- Publication number
- ES2031800T3 ES2031800T3 ES90125706T ES90125706T ES2031800T3 ES 2031800 T3 ES2031800 T3 ES 2031800T3 ES 90125706 T ES90125706 T ES 90125706T ES 90125706 T ES90125706 T ES 90125706T ES 2031800 T3 ES2031800 T3 ES 2031800T3
- Authority
- ES
- Spain
- Prior art keywords
- olefin polymerization
- olefin
- catalyst
- catalyst component
- olephine polymerization
- 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 - Lifetime
Links
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
- C08F4/00—Polymerisation catalysts
-
- 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
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
Abstract
ESTA INVENCION SE REFIERE A LOS COMPONENTES SOLIDOS CATALIZADORES, FORMADOS PREPOLIMERIZANDO DOS TIPOS AL MENOS DE (ALFA)-OLEFINA, EN UN CATALIZADOR DE POLIMERIZACION OLEFINA, COMPRENDIENDO UN COMPONENTE CATALIZADOR DE TITANIO SOLIDO, UN CATALIZADOR DE COMPUESTO ORGANOMETALICO Y SI ES NECESARIO, UN ELECTRON DONADOR, PARA EL CATALIZADOR DE POLIMERIZACION OLEFINA, CONTENIENDO DICHO COMPONENTE SOLIDO CATALIZADOR PARA POLIMERIZACION OLEFINA, UN COMPONENTE CATALIZADOR DE COMPUESTO ORGANOMETALICO, Y SI ES NECESARIO, UN ELECTRON DONADOR, Y PARA LOS PROCESOS PARA POLIMERIZACION OLEFINA UTILIZANDO DICHO CATALIZADOR DE POLIMERIZACION OLEFINA. DE ACUERDO CON ESTA INVENCION, PUEDE HABER PARTICULAS FABRICADAS DE DE POLIMEROS OLEFINOS, TENIENDO BAJA ADHERENCIA ENTRE ELLAS, TAMBIEN COMO UNA BUENA DISTRIBUCION DE PARTICULAS Y EXCELENTES PROPIEDADES GRANULARES AUN CUANDO CONTIENEN UNA GRAN CANTIDAD DE UNA PORCION (PARTE) DE POLIMERO OLEFINO AMORFO.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1340909A JP2940684B2 (ja) | 1989-12-29 | 1989-12-29 | オレフィン重合用固体状触媒成分およびこの触媒成分を用いたオレフィンの重合方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
ES2031800T1 ES2031800T1 (es) | 1993-01-01 |
ES2031800T3 true ES2031800T3 (es) | 1997-09-16 |
Family
ID=18341422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES90125706T Expired - Lifetime ES2031800T3 (es) | 1989-12-29 | 1990-12-28 | Componentes de catalizador solido para polimerizacion de olefinas y procedimiento de polimerizacion de olefina utilizando los mismos. |
Country Status (16)
Country | Link |
---|---|
US (1) | US5153158A (es) |
EP (1) | EP0435332B2 (es) |
JP (1) | JP2940684B2 (es) |
KR (1) | KR940010963B1 (es) |
CN (2) | CN1038685C (es) |
AT (1) | ATE151782T1 (es) |
CA (1) | CA2033404C (es) |
CZ (1) | CZ283582B6 (es) |
DE (2) | DE69030489T3 (es) |
DK (1) | DK0435332T3 (es) |
ES (1) | ES2031800T3 (es) |
GR (2) | GR920300075T1 (es) |
MY (1) | MY105326A (es) |
PL (3) | PL167913B1 (es) |
RU (1) | RU2092495C1 (es) |
TW (1) | TW201763B (es) |
Families Citing this family (73)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2050338C (en) * | 1989-12-28 | 1998-05-19 | Hideo Funabashi | Catalyst component for olefin polymerization and process for producing polyolefins |
IT1246614B (it) | 1991-06-03 | 1994-11-24 | Himont Inc | Procedimento per la polimerizzazione in fase gas delle olefine |
US6291384B1 (en) | 1991-11-06 | 2001-09-18 | Mobil Oil Corporation | High activity catalyst prepared with alkoxysilanes |
US5939348A (en) * | 1991-11-06 | 1999-08-17 | Mobil Oil Corporation | Catalyst for the manufacture of polythylene with a narrow molecular weight distribution |
US5470812A (en) * | 1991-11-06 | 1995-11-28 | Mobil Oil Corporation | High activity polyethylene catalysts prepared with alkoxysilane reagents |
FR2689133A1 (fr) * | 1992-03-27 | 1993-10-01 | Atochem Elf Sa | Catalyseur de polymérisation des oléfines, son procédé d'obtention. |
US5308818A (en) * | 1992-06-08 | 1994-05-03 | Fina Technology, Inc. | Catalyst system for the polymerization of olefins |
JP3156213B2 (ja) * | 1993-02-23 | 2001-04-16 | 日石三菱株式会社 | ポリオレフィンの製造方法 |
US5376743A (en) * | 1993-03-11 | 1994-12-27 | Union Carbide Chemicals & Plastics Technology Corporation | Process for the production of sticky polymers |
US5518973A (en) * | 1993-10-15 | 1996-05-21 | Exxon Chemical Patents Inc. | Titanium trichloride catalyst system for polymerizing olefins |
EP0729478B1 (en) * | 1993-11-18 | 1999-01-07 | Mobil Oil Corporation | A catalyst composition for the copolymerization of ethylene |
TW412546B (en) * | 1994-05-19 | 2000-11-21 | Mitsui Petrochemical Ind | Solid titanium catalyst component for olefin polymerization, process for preparation of the same, olefin polymerization catalyst and process for olefin polymerization |
US6034189A (en) * | 1994-05-19 | 2000-03-07 | Mitsui Petrochemical Industries, Ltd. | Solid titanium catalyst component for olefin polymerization, process for preparation of the same, olefin polymerization catalyst and process for olefin polymerization |
IT1275867B1 (it) * | 1995-03-07 | 1997-10-24 | Enichem Elastomers | Procedimento per l'ottenimento di copolimeri elastomerici etilene- propilene ad alta purezza e distribuzione dei pesi molecolari |
US5849655A (en) * | 1996-12-20 | 1998-12-15 | Fina Technology, Inc. | Polyolefin catalyst for polymerization of propylene and a method of making and using thereof |
US5948720A (en) * | 1997-01-07 | 1999-09-07 | Huntsman Polymers Corporation | Catalyst for the production of flexible polyolefin compositions, methods for making and using same, and products thereof |
US6100351A (en) * | 1997-01-07 | 2000-08-08 | Huntsman Polymers Corporation | Olefin polymerization process and products thereof |
US6864207B2 (en) * | 1997-01-28 | 2005-03-08 | Fina Technology, Inc. | Ziegler-Natta catalyst for polyolefins |
US6930071B2 (en) * | 1997-01-28 | 2005-08-16 | Fina Technology, Inc. | Ziegler-natta catalyst for polyolefins |
US6080818A (en) * | 1997-03-24 | 2000-06-27 | Huntsman Polymers Corporation | Polyolefin blends used for non-woven applications |
EP1094083A3 (en) * | 1999-10-19 | 2001-12-12 | Idemitsu Petrochemical Co., Ltd. | Catalyst for olefin polymerization, method for producing olefin polymer, and olefin polymer |
US6358372B1 (en) | 2000-07-11 | 2002-03-19 | Union Carbide Chemicals & Plastics Technology Corporation | Method of reducing formation of precipitates in solvent recovery system |
EP1401884A1 (en) | 2001-05-29 | 2004-03-31 | Union Carbide Chemicals & Plastics Technology Corporation | Olefin polymerization catalyst compositions and method of preperation |
US6825146B2 (en) * | 2001-05-29 | 2004-11-30 | Union Carbide Chemicals & Plastics Technology Corporation | Olefin polymerization catalyst compositions and method of preparation |
KR100530795B1 (ko) * | 2001-12-26 | 2005-11-23 | 삼성토탈 주식회사 | 에틸렌 중합 및 공중합 방법 |
KR100999827B1 (ko) * | 2002-06-14 | 2010-12-10 | 유니온 카바이드 케미칼즈 앤드 플라스틱스 테크날러지 엘엘씨 | 촉매 조성물 및 전자 공여체의 혼합물을 사용하는 중합 방법 |
CN1314714C (zh) * | 2002-09-11 | 2007-05-09 | 日本聚丙烯公司 | 聚合α-烯烃的催化剂和使用其制备α-烯烃聚合物的方法 |
US7504464B2 (en) * | 2003-05-12 | 2009-03-17 | Univation Technologies, Llc | Process for control of polymer fines in a gas-phase polymerization |
WO2005005489A1 (en) * | 2003-06-24 | 2005-01-20 | Union Carbide Chemicals & Plastics Technology Corporation | Catalyst composition and polymerization process using mixture of silane electron donors |
US20060247123A1 (en) * | 2003-08-29 | 2006-11-02 | Shaub Gina R | Method for making partially dried readily dispersible olefin polymerization procatalyst |
KR20060099512A (ko) * | 2003-09-23 | 2006-09-19 | 유니온 카바이드 케미칼즈 앤드 플라스틱스 테크날러지 코포레이션 | 혼합된 선택성 조절제를 갖는 촉매 조성물 및 프로필렌중합 방법 |
JP5248774B2 (ja) | 2003-09-23 | 2013-07-31 | ダウ グローバル テクノロジーズ エルエルシー | ジカルボン酸エステル内部供与体を有する自己制限性触媒組成物及びプロピレン重合方法 |
WO2005035594A1 (en) | 2003-09-23 | 2005-04-21 | Union Carbide Chemicals & Plastics Technology Corporation | Self-extiguishing catalyst compostion with monocarboxylic acid ester internal donor and propylene polymerization process |
WO2005035597A1 (en) * | 2003-09-23 | 2005-04-21 | Dow Global Technologies Inc. | Catalyst composition for ethylene polymerization |
KR101114748B1 (ko) * | 2003-09-23 | 2012-03-05 | 다우 글로벌 테크놀로지스 엘엘씨 | 자가 제한 촉매 조성물 및 프로필렌 중합 방법 |
US7135531B2 (en) * | 2004-01-28 | 2006-11-14 | Basf Catalysts Llc | Spherical catalyst for olefin polymerization |
CN1938340A (zh) * | 2004-04-07 | 2007-03-28 | 联合碳化化学及塑料技术公司 | 烯烃聚合前催化剂组合物及其制备方法 |
ES2496140T3 (es) | 2004-06-16 | 2014-09-18 | Dow Global Technologies Llc | Método para identificar cocatalizadores Ziegler-Natta |
JP2008503602A (ja) * | 2004-06-16 | 2008-02-07 | ダウ グローバル テクノロジーズ インコーポレイティド | チーグラー・ナッタ研究のための装置および方法 |
RU2377256C2 (ru) | 2004-08-09 | 2009-12-27 | Юнион Карбайд Кемикалз Энд Пластикс Текнолоджи Ллс | Твердый высушенный распылением прокатализатор циглера-натта и способ полимеризации, в котором он используется |
MX2007001648A (es) * | 2004-08-09 | 2007-04-23 | Union Carbide Chem Plastic | Procatalizador de ziegler-natta secado por aspersion, fuerte y proceso de polimerizacion que emplea el mismo. |
KR100640275B1 (ko) * | 2004-10-14 | 2006-11-01 | 대한유화공업 주식회사 | 에틸렌 중합 및/또는 에틸렌 공중합용 고체 촉매의 제조방법 |
US7776979B2 (en) * | 2007-01-26 | 2010-08-17 | Lg Chem, Ltd. | Prepolymerized catalyst for olefin polymerization, process for polymerizing olefin by using the catalyst and polyolefin produced by the process |
US7817819B1 (en) * | 2007-04-03 | 2010-10-19 | Nanostellar, Inc. | Characterization of metal particle distributions in a supported catalyst |
EP2014687B1 (en) * | 2007-06-14 | 2011-05-18 | Borealis Technology Oy | Process for the production of propylene copolymers using a prepolymerised catalyst |
US7981517B2 (en) * | 2007-08-28 | 2011-07-19 | Dow Global Technologies Inc. | Bituminous compositions and methods of making and using same |
US8003741B2 (en) | 2008-02-07 | 2011-08-23 | Fina Technology, Inc. | Ziegler-Natta catalyst |
US8003559B2 (en) * | 2008-05-13 | 2011-08-23 | Basf Corporation | Internal donor for olefin polymerization catalysts |
US7638585B2 (en) | 2008-05-13 | 2009-12-29 | Basf Catalysts, Llc | Catalyst flow |
US8003558B2 (en) * | 2008-07-29 | 2011-08-23 | Basf Corporation | Internal donor for olefin polymerization catalysts |
EP2315623A1 (en) * | 2008-08-19 | 2011-05-04 | Dow Global Technologies LLC | Classified catalyst composition, apparatus, and method |
BRPI0919385B1 (pt) * | 2008-09-26 | 2019-06-04 | Basell Poliolefine Italia S.R.L. | Componentecatalisador pré-polimerizado, sistema catalisador e processo em fase gasosa para a polimerização de olefinas |
US8088872B2 (en) * | 2008-11-25 | 2012-01-03 | Dow Global Technologies Llc | Procatalyst composition including silyl ester internal donor and method |
MX2011005543A (es) * | 2008-11-25 | 2011-06-17 | Union Carbide Chem Plastic | Composicion de procatalizador con multiple donador interno teniendo silil ester y metodo. |
EP2373703B1 (en) | 2008-12-31 | 2016-11-09 | W.R. Grace & CO. - CONN. | Random propylene copolymer compositions, articles and process |
KR101600365B1 (ko) | 2008-12-31 | 2016-03-07 | 더블유.알. 그레이스 앤드 캄파니-콘. | 치환된 1,2-페닐렌 방향족 디에스테르 내부 공여체를 갖는 전촉매 조성물 및 방법 |
CN101864008B (zh) * | 2009-04-17 | 2011-11-02 | 中国石油化工股份有限公司 | 一种用于烯烃聚合反应的催化剂 |
US8247341B2 (en) * | 2009-04-17 | 2012-08-21 | Dow Global Technologies Llc | Procatalyst composition with silyl glutarate and method |
EP2421904B1 (en) * | 2009-04-23 | 2015-06-24 | W.R. Grace & CO. - CONN. | Procatalyst composition with adamantane and method |
MX340293B (es) | 2009-11-10 | 2016-07-04 | Total Petrochemicals Res Feluy | Polietileno bimodal para aplicaciones de moldeo por inyeccion-soplado y estirado. |
EP2507268B1 (en) * | 2009-12-02 | 2014-10-15 | W. R. Grace & Co.-Conn | Two atom bridged dicarbonate compounds as internal donors in catalysts for polypropylene manufacture |
CN102712704B (zh) * | 2009-12-02 | 2015-01-07 | 陶氏环球技术有限责任公司 | 作为用于聚丙烯制造的催化剂中的内部给体的三个和四个原子桥接的二碳酸酯化合物 |
HUE056588T2 (hu) | 2010-02-05 | 2022-02-28 | Total Res & Technology Feluy | Eljárás poliolefinek elõállítására |
BR112013015875B1 (pt) | 2010-12-21 | 2020-10-20 | W. R. Grace & Co. - Conn | processo de polimerização ziegler-natta para produzir um polímero baseado em propileno |
ES2654383T3 (es) | 2011-03-04 | 2018-02-13 | Total Research & Technology Feluy | Procedimiento de preparación de mezclas de poliolefina en un dispositivo para fundir y mezclar físicamente de manera continua las mezclas |
CN103502348B (zh) | 2011-03-04 | 2016-02-03 | 道达尔研究技术弗吕公司 | 齐格勒-纳塔生产的聚乙烯共混物的制备方法 |
WO2013045663A1 (en) | 2011-09-30 | 2013-04-04 | Total Research & Technology Feluy | High-density polyethylene for caps and closures |
EP2607387A1 (en) | 2011-12-23 | 2013-06-26 | Basell Poliolefine Italia S.r.l. | Pre-polymerized catalyst components for the polymerization of olefins |
EP2607386A1 (en) * | 2011-12-23 | 2013-06-26 | Basell Poliolefine Italia S.r.l. | Pre-polymerized catalyst components for the polymerization of olefins |
KR20160042925A (ko) | 2013-08-12 | 2016-04-20 | 토탈 리서치 앤드 테크놀로지 펠루이 | 사출 연신 취입 성형 적용을 위한 폴리에틸렌 |
PL3074464T3 (pl) | 2014-07-10 | 2017-09-29 | Total Research & Technology Feluy | Sposób wytwarzania kompozycji mającej wysoką odporność na pękanie pod wpływem czynników zewnętrznych z poużytkowego tworzywa sztucznego oraz wytwory wytworzone ze wspomnianej kompozycji |
US11591458B2 (en) | 2016-08-30 | 2023-02-28 | W.R. Grace & Co.-Conn. | Polyolefins with low ash content and method of making same |
CN109206547B (zh) * | 2017-07-03 | 2021-02-05 | 中国石化扬子石油化工有限公司 | 一种Ziegler-Natta型的丙烯聚合催化剂的外给电子体及包含它的催化剂 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5634709A (en) † | 1979-08-31 | 1981-04-07 | Mitsui Petrochem Ind Ltd | Gas phase polymerization or copolymerization of olefin |
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 |
JPS56133303A (en) * | 1980-03-22 | 1981-10-19 | Chisso Corp | Production of alpha-olefin polymer |
US4410671A (en) * | 1980-08-12 | 1983-10-18 | Phillips Petroleum Company | Catalyst, method of producing the catalyst, and polymerization process employing the catalyst |
US4325837A (en) * | 1980-08-12 | 1982-04-20 | Phillips Petroleum Company | Catalyst, method of producing the catalyst, and polymerization process employing the catalyst |
US4326988A (en) * | 1980-08-12 | 1982-04-27 | Phillips Petroleum Company | Catalyst, method of producing the catalyst, and polymerization process employing the catalyst |
JPS5898315A (ja) * | 1981-12-07 | 1983-06-11 | Chisso Corp | ポリオレフイン共重合体の粉体流動性改良法 |
EP0099774B2 (fr) * | 1982-06-24 | 1995-03-22 | BP Chimie Société Anonyme | Procédé pour la polymérisation et la copolymérisation des alpha-oléfines en lit fluidisé |
FR2541683B1 (fr) * | 1983-02-28 | 1986-05-09 | Ato Chimie | Procede pour la preparation d'un solide hydrocarbone actif utilisable pour polymeriser des olefines, et procede de synthese d'un polymere ou copolymere olefinique faisant appel audit solide hydrocarbone actif comme systeme |
CA1284549C (en) † | 1986-09-26 | 1991-05-28 | Fathi David Hussein | Process for the polymerization of propylene |
DE3752331T2 (de) † | 1987-02-02 | 2001-09-20 | Fina Technology | Verfahren zur Verbesserung der Effektivität eines prepolymerisierten Katalysators |
FR2629461B1 (fr) * | 1988-03-31 | 1993-05-07 | Bp Chimie Sa | Catalyseur de (co)polymerisation du propylene, supporte sur des particules spheriques de chlorure de magnesium et enrobe par du polypropylene, et procedes de preparation |
FR2651234B1 (fr) * | 1989-08-29 | 1993-03-12 | Bp Chem Int Ltd | Procede de fabrication en phase gazeuse de copolymeres du propylene a l'aide d'un systeme catalytique de haute activite. |
-
1989
- 1989-12-29 JP JP1340909A patent/JP2940684B2/ja not_active Expired - Lifetime
-
1990
- 1990-12-27 MY MYPI90002271A patent/MY105326A/en unknown
- 1990-12-27 US US07/634,737 patent/US5153158A/en not_active Expired - Lifetime
- 1990-12-27 TW TW079110903A patent/TW201763B/zh active
- 1990-12-28 RU SU904894186A patent/RU2092495C1/ru not_active IP Right Cessation
- 1990-12-28 DE DE69030489T patent/DE69030489T3/de not_active Expired - Lifetime
- 1990-12-28 PL PL90300679A patent/PL167913B1/pl unknown
- 1990-12-28 ES ES90125706T patent/ES2031800T3/es not_active Expired - Lifetime
- 1990-12-28 CA CA002033404A patent/CA2033404C/en not_active Expired - Fee Related
- 1990-12-28 PL PL90300678A patent/PL167905B1/pl unknown
- 1990-12-28 PL PL90288512A patent/PL167899B1/pl unknown
- 1990-12-28 EP EP90125706A patent/EP0435332B2/en not_active Expired - Lifetime
- 1990-12-28 DE DE199090125706T patent/DE435332T1/de active Pending
- 1990-12-28 DK DK90125706.3T patent/DK0435332T3/da active
- 1990-12-28 AT AT90125706T patent/ATE151782T1/de not_active IP Right Cessation
- 1990-12-29 CN CN90110256A patent/CN1038685C/zh not_active Expired - Lifetime
- 1990-12-29 KR KR1019900022415A patent/KR940010963B1/ko not_active IP Right Cessation
- 1990-12-29 CZ CS906942A patent/CZ283582B6/cs not_active IP Right Cessation
-
1992
- 1992-10-08 GR GR92300075T patent/GR920300075T1/el unknown
-
1997
- 1997-05-02 GR GR970400965T patent/GR3023309T3/el unknown
- 1997-07-04 CN CN97113747A patent/CN1174204A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
TW201763B (es) | 1993-03-11 |
ATE151782T1 (de) | 1997-05-15 |
ES2031800T1 (es) | 1993-01-01 |
US5153158A (en) | 1992-10-06 |
GR920300075T1 (en) | 1992-10-08 |
CN1174204A (zh) | 1998-02-25 |
DE69030489T2 (de) | 1997-09-04 |
EP0435332A2 (en) | 1991-07-03 |
CZ283582B6 (cs) | 1998-05-13 |
EP0435332B1 (en) | 1997-04-16 |
DE69030489D1 (de) | 1997-05-22 |
PL167899B1 (pl) | 1995-12-30 |
MY105326A (en) | 1994-09-30 |
RU2092495C1 (ru) | 1997-10-10 |
EP0435332B2 (en) | 2005-08-10 |
PL288512A1 (en) | 1991-09-09 |
GR3023309T3 (en) | 1997-08-29 |
CZ694290A3 (en) | 1996-07-17 |
PL167913B1 (pl) | 1995-12-30 |
CN1052870A (zh) | 1991-07-10 |
DK0435332T3 (da) | 1997-05-12 |
JP2940684B2 (ja) | 1999-08-25 |
KR910011920A (ko) | 1991-08-07 |
CA2033404C (en) | 1995-09-05 |
EP0435332A3 (en) | 1992-02-26 |
JPH03203908A (ja) | 1991-09-05 |
KR940010963B1 (ko) | 1994-11-21 |
DE69030489T3 (de) | 2006-03-16 |
PL167905B1 (pl) | 1995-12-30 |
CA2033404A1 (en) | 1991-06-30 |
DE435332T1 (de) | 1992-09-03 |
CN1038685C (zh) | 1998-06-10 |
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