MY136330A - Process for the polymerization of olefins - Google Patents
Process for the polymerization of olefinsInfo
- Publication number
- MY136330A MY136330A MYPI20024550A MYPI20024550A MY136330A MY 136330 A MY136330 A MY 136330A MY PI20024550 A MYPI20024550 A MY PI20024550A MY PI20024550 A MYPI20024550 A MY PI20024550A MY 136330 A MY136330 A MY 136330A
- Authority
- MY
- Malaysia
- Prior art keywords
- catalyst component
- olefins
- polymerization
- chr
- obtainable
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract 3
- 238000006116 polymerization reaction Methods 0.000 title abstract 3
- 150000001336 alkenes Chemical class 0.000 title 1
- 239000003054 catalyst Substances 0.000 abstract 3
- 229920000642 polymer Polymers 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical group [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 abstract 1
- 150000002367 halogens Chemical class 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 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
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/02—Ethene
-
- 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
- C08F10/04—Monomers containing three or four carbon atoms
- C08F10/06—Propene
-
- 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
-
- 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
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
-
- 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
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/04—Monomers containing three or four carbon atoms
- C08F110/06—Propene
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01204842 | 2001-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MY136330A true MY136330A (en) | 2008-09-30 |
Family
ID=8181409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MYPI20024550A MY136330A (en) | 2001-12-12 | 2002-12-04 | Process for the polymerization of olefins |
Country Status (19)
| Country | Link |
|---|---|
| US (1) | US7138469B2 (https=) |
| EP (1) | EP1453867B1 (https=) |
| JP (1) | JP4511185B2 (https=) |
| KR (1) | KR101080666B1 (https=) |
| CN (1) | CN100422221C (https=) |
| AR (1) | AR037790A1 (https=) |
| AU (1) | AU2002366733B9 (https=) |
| BR (1) | BR0207072B1 (https=) |
| CA (1) | CA2452573C (https=) |
| ES (1) | ES2527049T3 (https=) |
| HU (1) | HUP0303960A3 (https=) |
| MX (1) | MXPA03008573A (https=) |
| MY (1) | MY136330A (https=) |
| PL (1) | PL204746B1 (https=) |
| RU (1) | RU2308461C2 (https=) |
| SA (1) | SA03230560B1 (https=) |
| TW (1) | TWI268939B (https=) |
| WO (1) | WO2003054035A1 (https=) |
| ZA (1) | ZA200305940B (https=) |
Families Citing this family (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009050045A2 (en) * | 2007-10-15 | 2009-04-23 | Basell Poliolefine Italia S.R.L. | Process for the preparation of high fluidity propylene polymers |
| BRPI0820737B1 (pt) | 2007-12-18 | 2018-06-19 | Basell Poliolefine Italia S.R.L. | Copolímeros de propileno com hexeno-1 e películas tubulares obtidas a partir destes, bem como processo de polimerização para a preparração do polímero e processo da película tubular |
| WO2009080485A1 (en) * | 2007-12-19 | 2009-07-02 | Basell Poliolefine Italia S.R.L. | Soft and flexible polyolefin compositions |
| KR101769275B1 (ko) | 2009-06-19 | 2017-08-18 | 바셀 폴리올레핀 이탈리아 에스.알.엘 | 내충격성 프로필렌 중합체 조성물의 제조 방법 |
| CN102666678B (zh) | 2009-11-17 | 2016-01-20 | 巴塞尔聚烯烃意大利有限责任公司 | 可热收缩薄膜 |
| RU2425059C1 (ru) * | 2010-01-28 | 2011-07-27 | Учреждение Российской Академии Наук Ордена Трудового Красного Знамени Институт Нефтехимического Синтеза Им. А.В. Топчиева Ран (Инхс Ран) | Способ получения титан-магниевого нанокатализатора (со)полимеризации альфа-олефинов и сопряженных диенов |
| EP2614115B1 (en) | 2010-09-06 | 2016-04-27 | Basell Poliolefine Italia S.r.l. | Polyolefin compositions having improved sealability |
| EP2648910B1 (en) | 2010-12-09 | 2018-08-08 | Basell Poliolefine Italia S.r.l. | Permeable polymer film |
| EP2594593A1 (en) | 2011-11-17 | 2013-05-22 | Basell Poliolefine Italia S.r.l. | Process for the preparation of heterophasic propylene polymer compositions |
| EP2607389A1 (en) | 2011-12-20 | 2013-06-26 | Basell Polyolefine GmbH | Process for preparing olefin polymer by slurry loop polymerization having high powder density |
| EP2743278A1 (en) | 2012-12-11 | 2014-06-18 | Basell Polyolefine GmbH | Process for degassing and buffering polyolefin particles obtained by olefin polymerization |
| EP2743073A1 (en) * | 2012-12-12 | 2014-06-18 | Basell Poliolefine Italia S.r.l. | Propylene-based terpolymers |
| EP2757114A1 (en) * | 2013-01-18 | 2014-07-23 | Basell Poliolefine Italia S.r.l. | Catalyst components for the polymerization of olefins |
| KR101787231B1 (ko) * | 2013-06-03 | 2017-10-18 | 루머스 노보렌 테크놀로지 게엠베하 | 고성능 지글러-나타 촉매 시스템, 그 촉매 시스템의 제조 방법 및 용도 |
| JP6216887B2 (ja) | 2013-08-14 | 2017-10-18 | ボレアリス・アクチェンゲゼルシャフトBorealis Ag | 低温における耐衝撃性が改善されたプロピレン組成物 |
| MX2016001705A (es) | 2013-08-21 | 2016-05-18 | Borealis Ag | Composicion de poliolefina de alto flujo con alta rigidez y tenacidad. |
| WO2015024887A1 (en) | 2013-08-21 | 2015-02-26 | Borealis Ag | High flow polyolefin composition with high stiffness and toughness |
| EP2853563B1 (en) | 2013-09-27 | 2016-06-15 | Borealis AG | Films suitable for BOPP processing from polymers with high XS and high Tm |
| ES2568615T3 (es) | 2013-10-11 | 2016-05-03 | Borealis Ag | Película para etiquetas orientada en la dirección de la máquina |
| US10519259B2 (en) | 2013-10-24 | 2019-12-31 | Borealis Ag | Low melting PP homopolymer with high content of regioerrors and high molecular weight |
| JP6147925B2 (ja) * | 2013-10-24 | 2017-06-14 | バーゼル・ポリオレフィン・イタリア・ソチエタ・ア・レスポンサビリタ・リミタータ | 多孔質プロピレン重合体の製造工程 |
| CA2927448C (en) | 2013-11-22 | 2017-01-17 | Borealis Ag | Low emission propylene homopolymer with high melt flow |
| EP3077426B1 (en) | 2013-12-04 | 2022-10-05 | Borealis AG | Phthalate-free pp homopolymers for meltblown fibers |
| KR101873134B1 (ko) | 2013-12-18 | 2018-06-29 | 보레알리스 아게 | 향상된 강성/인성 균형을 가진 bopp 필름 |
| CN105829364B (zh) * | 2014-01-17 | 2017-11-10 | 博里利斯股份公司 | 用于制备丙烯/1‑丁烯共聚物的方法 |
| BR112016017227B1 (pt) | 2014-02-06 | 2021-06-29 | Borealis Ag | Copolímero de propileno heterofásico, película não orientada, recipiente, e uso de um copolímero de propileno heterofásico |
| JP2017508032A (ja) | 2014-02-06 | 2017-03-23 | ボレアリス エージー | 高衝撃強さを有する軟質コポリマー |
| EP2907841A1 (en) | 2014-02-14 | 2015-08-19 | Borealis AG | Polypropylene composite |
| EP2947118B1 (en) | 2014-05-20 | 2017-11-29 | Borealis AG | Polypropylene composition for automotive interior applications |
| BR112018010614B1 (pt) | 2015-12-11 | 2022-04-26 | Basell Poliolefine Italia S.R.L. | Copolímeros de propileno |
| WO2017097579A1 (en) | 2015-12-11 | 2017-06-15 | Basell Poliolefine Italia S.R.L. | Propylene based polymer composition |
| KR102610378B1 (ko) * | 2019-01-09 | 2023-12-05 | 바셀 폴리올레핀 이탈리아 에스.알.엘 | 올레핀 중합용 촉매 성분 |
| EP4491639A1 (en) * | 2022-03-11 | 2025-01-15 | Toho Titanium Co., Ltd. | Solid catalyst ingredient for olefin polymerization, method for producing solid catalyst ingredient for olefin polymerization, catalyst for olefin polymerization, method for producing olefin polymer, and olefin polymer |
| WO2026041323A1 (en) | 2024-08-19 | 2026-02-26 | Basell Poliolefine Italia S.R.L. | Polypropylene composition having good thermal and optical properties |
Family Cites Families (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE363977B (https=) * | 1968-11-21 | 1974-02-11 | Montedison Spa | |
| YU35844B (en) * | 1968-11-25 | 1981-08-31 | Montedison Spa | Process for obtaining catalysts for the polymerization of olefines |
| US4192774A (en) * | 1978-01-27 | 1980-03-11 | Shell Oil Company | Preparation of an active TiCl3 catalyst |
| IT1096661B (it) * | 1978-06-13 | 1985-08-26 | Montedison Spa | Procedimento per la preparazione di prodotti in forma sferoidale solidi a temperatura ambiente |
| IT1098272B (it) * | 1978-08-22 | 1985-09-07 | Montedison Spa | Componenti,di catalizzatori e catalizzatori per la polimerizzazione delle alfa-olefine |
| US4657883A (en) * | 1985-10-07 | 1987-04-14 | Amoco Corporation | Ester-modified olefin polymerization catalyst |
| JP2523109B2 (ja) * | 1986-05-02 | 1996-08-07 | 三菱化学株式会社 | オレフイン重合用触媒成分 |
| IT1227258B (it) | 1988-09-30 | 1991-03-28 | Himont Inc | Componenti e catalizzatori per la polimerizzazione di olefine |
| IT1230134B (it) | 1989-04-28 | 1991-10-14 | Himont Inc | Componenti e catalizzatori per la polimerizzazione di olefine. |
| TW198726B (https=) * | 1989-12-29 | 1993-01-21 | Mitsui Petroleum Chemicals Ind | |
| JP2940684B2 (ja) * | 1989-12-29 | 1999-08-25 | 三井化学株式会社 | 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 |
| IT1246614B (it) | 1991-06-03 | 1994-11-24 | Himont Inc | Procedimento per la polimerizzazione in fase gas delle olefine |
| IT1250731B (it) | 1991-07-31 | 1995-04-21 | Himont Inc | Procedimento per la preparazione di polietilene lineare a bassa densita' |
| CA2077744C (en) * | 1991-09-30 | 2003-04-15 | Edwar Shoukri Shamshoum | Homogeneous-heterogeneous catalyst system for polyolefins |
| IT1262935B (it) * | 1992-01-31 | 1996-07-22 | Montecatini Tecnologie Srl | Componenti e catalizzatori per la polimerizzazione di olefine |
| IT1262934B (it) | 1992-01-31 | 1996-07-22 | Montecatini Tecnologie Srl | Componenti e catalizzatori per la polimerizzazione di olefine |
| IT1254279B (it) * | 1992-03-13 | 1995-09-14 | Montecatini Tecnologie Srl | Procedimento per la polimerizzazione in fase gas delle olefine |
| IT1256648B (it) * | 1992-12-11 | 1995-12-12 | Montecatini Tecnologie Srl | Componenti e catalizzatori per la polimerizzazione delle olefine |
| BE1006438A3 (fr) * | 1992-12-17 | 1994-08-30 | Solvay | Systeme catalytique, utilisation de ce systeme catalytique pour la (co)polymerisation d'olefines, procede de preparation de ce systeme catalytique et procede de (co)polymerisation d'olefines. |
| US5804524A (en) * | 1993-04-28 | 1998-09-08 | Fina Technology, Inc. | Process for a isotactic/syndiotactic polymer blend in a single reactor |
| US5643846A (en) * | 1993-04-28 | 1997-07-01 | Fina Technology, Inc. | Process for a isotactic/syndiotactic polymer blend in a single reactor |
| BR9407034A (pt) * | 1993-06-24 | 1996-03-19 | Dow Chemical Co | Complexos de titânio ( I) ou zircônio (II) e catalisadores de polimerização por adição dos mesmos |
| US5589539A (en) * | 1994-11-23 | 1996-12-31 | Union Carbide Chemicals & Plastics Technology Corporation | Process for preparing an in situ polyethylene blend |
| IL117114A (en) | 1995-02-21 | 2000-02-17 | Montell North America Inc | Components and catalysts for the polymerization ofolefins |
| IL127230A (en) | 1997-03-29 | 2004-07-25 | Montell Technology Company Bv | Magnesium dichloride-alcohol adducts, process for their preparation and catalyst components obtained therefrom |
| US6051525A (en) * | 1997-07-14 | 2000-04-18 | Mobil Corporation | Catalyst for the manufacture of polyethylene with a broad or bimodal molecular weight distribution |
| US6828268B1 (en) | 1999-11-05 | 2004-12-07 | Phillips Petroleum Company | Polymerization catalyst systems and processes using alkyl lithium compounds as a cocatalyst |
-
2002
- 2002-12-04 MY MYPI20024550A patent/MY136330A/en unknown
- 2002-12-04 TW TW091135174A patent/TWI268939B/zh not_active IP Right Cessation
- 2002-12-10 HU HU0303960A patent/HUP0303960A3/hu unknown
- 2002-12-10 MX MXPA03008573A patent/MXPA03008573A/es active IP Right Grant
- 2002-12-10 WO PCT/EP2002/014111 patent/WO2003054035A1/en not_active Ceased
- 2002-12-10 RU RU2003128027/04A patent/RU2308461C2/ru active
- 2002-12-10 BR BRPI0207072-3A patent/BR0207072B1/pt active IP Right Grant
- 2002-12-10 PL PL374056A patent/PL204746B1/pl not_active IP Right Cessation
- 2002-12-10 JP JP2003554748A patent/JP4511185B2/ja not_active Expired - Lifetime
- 2002-12-10 CN CNB028123816A patent/CN100422221C/zh not_active Expired - Lifetime
- 2002-12-10 AU AU2002366733A patent/AU2002366733B9/en not_active Ceased
- 2002-12-10 US US10/473,313 patent/US7138469B2/en not_active Expired - Lifetime
- 2002-12-10 CA CA2452573A patent/CA2452573C/en not_active Expired - Lifetime
- 2002-12-10 EP EP02805313.0A patent/EP1453867B1/en not_active Expired - Lifetime
- 2002-12-10 ES ES02805313.0T patent/ES2527049T3/es not_active Expired - Lifetime
- 2002-12-10 KR KR1020037012812A patent/KR101080666B1/ko not_active Expired - Lifetime
- 2002-12-11 AR ARP020104798A patent/AR037790A1/es active IP Right Grant
-
2003
- 2003-03-01 SA SA3230560A patent/SA03230560B1/ar unknown
- 2003-07-31 ZA ZA2003/05940A patent/ZA200305940B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN100422221C (zh) | 2008-10-01 |
| EP1453867A1 (en) | 2004-09-08 |
| ZA200305940B (en) | 2005-01-26 |
| BR0207072A (pt) | 2004-01-27 |
| US7138469B2 (en) | 2006-11-21 |
| SA03230560B1 (ar) | 2008-07-19 |
| HUP0303960A3 (en) | 2007-11-28 |
| CA2452573C (en) | 2011-03-22 |
| TWI268939B (en) | 2006-12-21 |
| ES2527049T3 (es) | 2015-01-20 |
| RU2308461C2 (ru) | 2007-10-20 |
| JP4511185B2 (ja) | 2010-07-28 |
| PL374056A1 (en) | 2005-09-19 |
| EP1453867B1 (en) | 2014-11-12 |
| AU2002366733A1 (en) | 2003-07-09 |
| CN1518562A (zh) | 2004-08-04 |
| TW200409780A (en) | 2004-06-16 |
| AR037790A1 (es) | 2004-12-01 |
| PL204746B1 (pl) | 2010-02-26 |
| US20040077490A1 (en) | 2004-04-22 |
| KR101080666B1 (ko) | 2011-11-08 |
| AU2002366733B9 (en) | 2009-03-19 |
| MXPA03008573A (es) | 2003-12-08 |
| AU2002366733B2 (en) | 2008-10-16 |
| BR0207072B1 (pt) | 2012-08-21 |
| HUP0303960A2 (hu) | 2004-03-01 |
| JP2005513213A (ja) | 2005-05-12 |
| RU2003128027A (ru) | 2005-02-27 |
| KR20040064613A (ko) | 2004-07-19 |
| CA2452573A1 (en) | 2003-07-03 |
| WO2003054035A1 (en) | 2003-07-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| MY136330A (en) | Process for the polymerization of olefins | |
| DE60029399D1 (de) | Komponente und katalysatore für die polymerisation von olefinen | |
| MY141787A (en) | Crosslinked metallocene compound for olefin polymerization and method of polymerizing olefin with the same | |
| ATE534676T1 (de) | Verfahren zur herstellung von polyethylenzusammensetzungen mit niedriger dichte und damit hergestellte polymere | |
| TW200613347A (en) | Supported metallocene catalyst, method of preparing the catalyst and method of preparing polyolefin using the catalyst | |
| DE69823397D1 (de) | Verbesserte Ziegler-Natta Katalysatoren für Olefinpolymerisation | |
| HUT59424A (en) | Process for producing catalyst and prepolymer, as well as polyolefins by using them | |
| TW200643039A (en) | Pseudo-block copolymers and process employing chain shuttling agent | |
| SG157383A1 (en) | Solid titanium catalyst component, catalyst for olefin polymerization, and process for producing olefin polymer | |
| DE60224205D1 (de) | Komponenten und katalysatoren für die polymerisation von olefinen | |
| DE60011453D1 (de) | Katalysatorzusammensetzungen für die polymerisation von olefinen zu polymeren mit multimodaler molekulargewichtsverteilung, verfahren zur herstellung und verwendung des katalysators | |
| SG165384A1 (en) | Control of polymer architecture and molecular weight distribution via multi-centered shuttling agent | |
| ATE519787T1 (de) | Komponenten und katalysatoren für die polymerisation von olefinen | |
| ATE447588T1 (de) | Komponenten und katalysatoren zur olefinpolymerisation | |
| PT1719788E (pt) | Resina de polietileno com distribuição granulométrica estreita | |
| AU1015292A (en) | Metallocene (CO)polymers, process for their preparation and their use as catalysts | |
| AU4682699A (en) | Post-reactor process for treating polymers prepared in a gas phase polymerization in the presence of an inert particulate material | |
| TW200628504A (en) | Solid catalyst component and catalyst for polymerization of olefins and process for producing olefin polymer or copolymer using same | |
| ATE240356T1 (de) | Ethylenpolymerisation | |
| DE60236326D1 (de) | Fester katalysatorbestandteil zur polymerisation und copolymerisation von ethylen, verfahren zu dessen herstellung | |
| BRPI0821085A2 (pt) | Terpolímeros de etileno | |
| SG83828A1 (en) | Catalyst for addition polymerization, and process for producing addition polymer with the same | |
| AR032281A1 (es) | Un catalizador para la polimerizacion de olefinas y un procedimiento para la polimerizacion de olefinas y un procedimiento para la preparacion de copolimeros de etileno, los cuales se llevan a cabo en presencia del catalizador | |
| WO2006094897A8 (en) | Catalyst components comprising titanium, magnesium, halogen and 1,2-dimethoxyethane for the polymerization of olefins | |
| AU2001222347A1 (en) | A catalyst for ethylene homo- and copolymerization |