AU740974B2 - Polyethylenes - Google Patents

Polyethylenes Download PDF

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Publication number
AU740974B2
AU740974B2 AU24431/99A AU2443199A AU740974B2 AU 740974 B2 AU740974 B2 AU 740974B2 AU 24431/99 A AU24431/99 A AU 24431/99A AU 2443199 A AU2443199 A AU 2443199A AU 740974 B2 AU740974 B2 AU 740974B2
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AU
Australia
Prior art keywords
polyethylene
catalyst
polymer
produced
chromium
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.)
Ceased
Application number
AU24431/99A
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English (en)
Other versions
AU2443199A (en
Inventor
Vidar Almquist
Tore Dreng
Arild Follestad
Espen Ommundsen
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Borealis Technology Oy
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Borealis Technology Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Borealis Technology Oy filed Critical Borealis Technology Oy
Publication of AU2443199A publication Critical patent/AU2443199A/en
Application granted granted Critical
Publication of AU740974B2 publication Critical patent/AU740974B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/02Ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; 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
    • C08F4/60Metals; 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
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/69Chromium, molybdenum, tungsten or compounds thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/02Ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; 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
    • C08F4/60Metals; 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
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/639Component covered by group C08F4/62 containing a transition metal-carbon bond
    • C08F4/63912Component covered by group C08F4/62 containing a transition metal-carbon bond in combination with an organoaluminium compound
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; 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
    • C08F4/60Metals; 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
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/639Component covered by group C08F4/62 containing a transition metal-carbon bond
    • C08F4/63916Component covered by group C08F4/62 containing a transition metal-carbon bond supported on a carrier, e.g. silica, MgCl2, polymer
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; 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
    • C08F4/60Metals; 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
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/639Component covered by group C08F4/62 containing a transition metal-carbon bond
    • C08F4/6392Component covered by group C08F4/62 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
    • C08F4/63922Component covered by group C08F4/62 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not
    • C08F4/63925Component covered by group C08F4/62 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not two cyclopentadienyl rings being mutually non-bridged
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; 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
    • C08F4/60Metals; 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
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/64Titanium, zirconium, hafnium or compounds thereof
    • C08F4/659Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C08F4/65912Component covered by group C08F4/64 containing a transition metal-carbon bond in combination with an organoaluminium compound
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; 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
    • C08F4/60Metals; 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
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/64Titanium, zirconium, hafnium or compounds thereof
    • C08F4/659Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C08F4/6592Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
    • C08F4/65922Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not
    • C08F4/65925Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not two cyclopentadienyl rings being mutually non-bridged

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)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Polymerisation Methods In General (AREA)
  • Peptides Or Proteins (AREA)
AU24431/99A 1998-02-09 1999-02-09 Polyethylenes Ceased AU740974B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO980552A NO980552D0 (no) 1998-02-09 1998-02-09 Katalysatorbestandel og katalysator for (ko)polymerisering av etylen, og fremgangsmåte for fremstilling av slik
NO19980552 1998-02-09
PCT/NO1999/000044 WO1999040131A1 (en) 1998-02-09 1999-02-09 Polyethylenes obtained by use of dual site catalyst

Publications (2)

Publication Number Publication Date
AU2443199A AU2443199A (en) 1999-08-23
AU740974B2 true AU740974B2 (en) 2001-11-15

Family

ID=19901654

Family Applications (2)

Application Number Title Priority Date Filing Date
AU24431/99A Ceased AU740974B2 (en) 1998-02-09 1999-02-09 Polyethylenes
AU24430/99A Ceased AU738712B2 (en) 1998-02-09 1999-02-09 A catalyst for the (co)polymerisation of ethylene and a method for the preparation thereof

Family Applications After (1)

Application Number Title Priority Date Filing Date
AU24430/99A Ceased AU738712B2 (en) 1998-02-09 1999-02-09 A catalyst for the (co)polymerisation of ethylene and a method for the preparation thereof

Country Status (14)

Country Link
US (2) US6541581B1 (enExample)
EP (2) EP1053264A1 (enExample)
JP (2) JP2002502895A (enExample)
KR (1) KR20010040769A (enExample)
CN (2) CN1136241C (enExample)
AR (1) AR018078A1 (enExample)
AT (1) ATE283866T1 (enExample)
AU (2) AU740974B2 (enExample)
BR (2) BR9907708A (enExample)
CA (2) CA2320436C (enExample)
DE (1) DE69922340T2 (enExample)
ES (1) ES2234237T3 (enExample)
NO (1) NO980552D0 (enExample)
WO (2) WO1999040131A1 (enExample)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO980552D0 (no) * 1998-02-09 1998-02-09 Borealis As Katalysatorbestandel og katalysator for (ko)polymerisering av etylen, og fremgangsmåte for fremstilling av slik
NO981631L (no) * 1998-04-08 1999-10-11 Borealis As Katalysator for polymerisasjon av etylen, og fremgangsmaate for fremstilling av denne
US6272384B1 (en) 1999-05-27 2001-08-07 Urologix, Inc. Microwave therapy apparatus
GB9919718D0 (en) * 1999-08-19 1999-10-20 Borealis As Process
US6433133B1 (en) * 1999-11-16 2002-08-13 Eastman Chemical Company Process for reducing the weight average molecular weight and melt index ratio of polyethylenes and polyethylene products
US6388017B1 (en) * 2000-05-24 2002-05-14 Phillips Petroleum Company Process for producing a polymer composition
ATE337343T1 (de) 2001-04-30 2006-09-15 Grace W R & Co Geträgerte dualübergangsmetallkatalysatorsysteme
US6943224B2 (en) 2001-04-30 2005-09-13 W. R. Grace & Co.-Conn. Process for preparing supported transition metal catalyst systems and catalyst systems prepared thereby
EP1587844A1 (en) * 2002-12-17 2005-10-26 O & D Trading Limited Supported olefin polymerization catalyst
US7384885B2 (en) 2003-03-31 2008-06-10 Exxonmobil Chemical Patents Inc. Catalyst activation and resins therefrom
US20040192865A1 (en) * 2003-03-31 2004-09-30 Roger Scott T. Resin for extruded pipe
WO2004096868A1 (en) * 2003-03-31 2004-11-11 Exxonmobil Chemical Patents Inc. Resin for extruded pipe
WO2004096867A1 (en) * 2003-03-31 2004-11-11 Exxonmobil Chemical Patents Inc. Utility conduit resin
US20040192864A1 (en) * 2003-03-31 2004-09-30 Exxonmobil Chemical Company Utility conduit resin
DE102005019393A1 (de) 2005-04-25 2006-10-26 Basell Polyolefine Gmbh Polyethylenformmassen für Spritzgussanwendungen
DE102005019395A1 (de) * 2005-04-25 2006-10-26 Basell Polyolefine Gmbh Formmasse aus Polyethylen zur Folienherstellung und Verfahren zum Herstellen der Formmasse in Gegenwart eines Mischkatalysators
EP2218752B1 (en) * 2006-04-07 2013-06-12 Dow Global Technologies LLC Polyolefin compositions and articles made therefrom
CA2605044C (en) * 2007-10-01 2014-12-02 Nova Chemicals Corporation Polymerization process using a mixed catalyst system
CA2605077C (en) * 2007-10-01 2014-07-08 Nova Chemicals Corporation A co-supported catalyst system
US7951881B2 (en) 2009-02-27 2011-05-31 Chevron Phillips Chemical Company Lp Polyethylene film having improved barrier properties and methods of making same
SG173773A1 (en) * 2009-02-27 2011-10-28 Chevron Phillips Chemical Co Polyethylene film having improved barrier properties and methods of making same
US8852748B2 (en) 2009-02-27 2014-10-07 Chevron Phillips Chemical Company Lp Polyethylene film having improved barrier properties and methods of making same
CA2713042C (en) 2010-08-11 2017-10-24 Nova Chemicals Corporation Method of controlling polymer architecture
US8148470B1 (en) 2010-11-19 2012-04-03 Exxonmobil Chemical Patents Inc. Processes for making multimodal molecular weight distribution polyolefins
RU2579518C2 (ru) * 2010-11-19 2016-04-10 Юнивейшн Текнолоджиз,ЛЛК Способы получения полиолефинов, обладающих мультимодальным молекулярно-массовым распределением
US8653208B2 (en) * 2012-05-18 2014-02-18 Union Carbide Chemicals & Plastics Technology Llc Process for preparing catalysts and catalysts made thereby
CA2783494C (en) 2012-07-23 2019-07-30 Nova Chemicals Corporation Adjusting polymer composition
CN104877052B (zh) * 2015-05-06 2018-04-13 无锡耀汇科技有限公司 一种聚乙烯树脂
CN104877051B (zh) * 2015-05-06 2018-04-13 无锡耀汇科技有限公司 一种聚烯烃催化剂
CN108884179B (zh) * 2016-04-20 2021-09-21 尤尼威蒂恩技术有限责任公司 聚合物流动指数改性剂
WO2018130539A1 (en) * 2017-01-11 2018-07-19 Sabic Global Technologies B.V. Chromium oxide catalyst for ethylene polymerization
EP3568421B1 (en) 2017-01-11 2023-12-27 SABIC Global Technologies B.V. Chromium oxide catalyst for ethylene polymerization
US11952480B2 (en) 2018-02-05 2024-04-09 Exxonmobil Chemical Patents Inc. Enhanced processability of LLDPE by addition of ultra-high molecular weight density polyethylene
JP2023539244A (ja) * 2020-08-24 2023-09-13 セラニーズ・インターナショナル・コーポレーション 分子量分布の狭い高密度ポリエチレンから作製されるゲル押出物品

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151343A1 (en) * 1983-12-10 1985-08-14 Stamicarbon B.V. Orientated polyolefins
EP0339571A1 (en) * 1988-04-26 1989-11-02 Showa Denko Kabushiki Kaisha Process for preparation of ethylene polymers
US5470811A (en) * 1993-08-06 1995-11-28 Exxon Chemical Patents Inc. Polymerization catalysts, their production and use

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5614456A (en) * 1993-11-15 1997-03-25 Mobil Oil Corporation Catalyst for bimodal molecular weight distribution ethylene polymers and copolymers
BE1009186A3 (fr) * 1995-03-13 1996-12-03 Solvay Solide catalytique pour la (co)polymerisation d'ethylene, procede pour sa preparation, systeme catalytique pour la (co)polymerisation d'ethylene et procede de (co)polymerisation d'ethylene.
ATE198898T1 (de) * 1995-08-22 2001-02-15 Basf Ag Polymerisate des ethylens mit hoher spannungsrissbeständigkeit und katalysatorsystem für deren herstellung
DE19716239A1 (de) * 1997-04-18 1998-10-22 Basf Ag Verfahren zur Polymerisation von alpha-Olefinen in der Gasphase
GB9712663D0 (en) * 1997-06-16 1997-08-20 Borealis As Process
NO980552D0 (no) * 1998-02-09 1998-02-09 Borealis As Katalysatorbestandel og katalysator for (ko)polymerisering av etylen, og fremgangsmåte for fremstilling av slik
US6013596A (en) * 1998-05-18 2000-01-11 Arco Chemical Technology, L.P. Double metal cyanide catalysts containing cyclic, bidentate complexing agents
WO1999065949A2 (en) * 1998-06-16 1999-12-23 Borealis Technology Oy Olefin polymerization process
DE69908649T2 (de) * 1998-12-16 2004-04-29 Borealis Technology Oy Mehrstufenverfahren zur darstellung von polyolefinen mit hoher schmelzfestigkeit
DE60002056T2 (de) * 1999-02-22 2003-11-06 Borealis Technology Oy, Porvoo Olefinpolymerisationsverfahren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151343A1 (en) * 1983-12-10 1985-08-14 Stamicarbon B.V. Orientated polyolefins
EP0339571A1 (en) * 1988-04-26 1989-11-02 Showa Denko Kabushiki Kaisha Process for preparation of ethylene polymers
US5470811A (en) * 1993-08-06 1995-11-28 Exxon Chemical Patents Inc. Polymerization catalysts, their production and use

Also Published As

Publication number Publication date
CA2320271C (en) 2007-07-17
US6541581B1 (en) 2003-04-01
JP2002502897A (ja) 2002-01-29
EP1045866B1 (en) 2004-12-01
CA2320436A1 (en) 1999-08-12
EP1045866A1 (en) 2000-10-25
CA2320436C (en) 2007-08-14
WO1999040131A1 (en) 1999-08-12
ATE283866T1 (de) 2004-12-15
KR20010040769A (ko) 2001-05-15
US6780809B1 (en) 2004-08-24
BR9907702A (pt) 2000-11-14
CN1290272A (zh) 2001-04-04
ES2234237T3 (es) 2005-06-16
CN1290274A (zh) 2001-04-04
CN1132853C (zh) 2003-12-31
EP1053264A1 (en) 2000-11-22
JP2002502895A (ja) 2002-01-29
BR9907708A (pt) 2000-11-14
DE69922340D1 (de) 2005-01-05
CN1136241C (zh) 2004-01-28
CA2320271A1 (en) 1999-08-12
WO1999040126A1 (en) 1999-08-12
DE69922340T2 (de) 2005-11-10
AU738712B2 (en) 2001-09-27
WO1999040126A9 (en) 1999-10-21
AU2443099A (en) 1999-08-23
AU2443199A (en) 1999-08-23
AR018078A1 (es) 2001-10-31
NO980552D0 (no) 1998-02-09

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