IN173199B - - Google Patents

Info

Publication number
IN173199B
IN173199B IN83CA1990A IN173199B IN 173199 B IN173199 B IN 173199B IN 83CA1990 A IN83CA1990 A IN 83CA1990A IN 173199 B IN173199 B IN 173199B
Authority
IN
India
Application number
Other languages
English (en)
Inventor
Luigi Resconi
Umberto Giannini
Enrico Albizzati
Original Assignee
Ausimont Srl
Hmont Inc
Montedison Spa
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27272005&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=IN173199(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to IT8919253A priority Critical patent/IT1237398B/it
Priority to IL93204A priority patent/IL93204A/xx
Priority to ZA90639A priority patent/ZA90639B/xx
Priority to US07/471,902 priority patent/US5126303A/en
Priority to CA002008906A priority patent/CA2008906C/fr
Priority to NO900435A priority patent/NO174106C/no
Priority to FI900467A priority patent/FI103123B1/fi
Priority to AU48892/90A priority patent/AU626628B2/en
Priority to CS90428A priority patent/CZ281689B6/cs
Priority to HU94/90A priority patent/HU218844B/hu
Priority to MX19309A priority patent/MX19309A/es
Application filed by Ausimont Srl, Hmont Inc, Montedison Spa filed Critical Ausimont Srl
Priority to YU00173/90A priority patent/YU17390A/xx
Priority to IN83CA1990 priority patent/IN173199B/en
Priority to AT90101893T priority patent/ATE89290T1/de
Priority to DE90101893T priority patent/DE69001565T2/de
Priority to ES199090101893T priority patent/ES2041053T3/es
Priority to EP90101893A priority patent/EP0384171B1/fr
Priority to KR1019900001116A priority patent/KR0145291B1/ko
Priority to BR909000415A priority patent/BR9000415A/pt
Priority to PT93023A priority patent/PT93023B/pt
Priority to JP2021874A priority patent/JP2954251B2/ja
Priority to CN90101414A priority patent/CN1019579B/zh
Priority to SU904743355A priority patent/RU1836142C/ru
Priority to SU904743351A priority patent/RU2031901C1/ru
Publication of IN173199B publication Critical patent/IN173199B/en

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
    • 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
    • C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C08F4/65912—Component covered by group C08F4/64 containing a transition metal-carbon bond in combination with an organoaluminium compound
    • 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
    • C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C08F4/6592—Component 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
    • C08F4/65922—Component 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/943—Polymerization with metallocene catalysts

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)
  • Polymerization Catalysts (AREA)
  • Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
IN83CA1990 1989-01-31 1990-01-30 IN173199B (fr)

Priority Applications (24)

Application Number Priority Date Filing Date Title
IT8919253A IT1237398B (it) 1989-01-31 1989-01-31 Catalizzatori per la polimerizzazione di olefine.
IL93204A IL93204A (en) 1989-01-31 1990-01-29 Catalysts for the polymerization of olefins
ZA90639A ZA90639B (en) 1989-01-31 1990-01-29 Catalysts for the polymerization of olefins
US07/471,902 US5126303A (en) 1989-01-31 1990-01-29 Catalysts for the polymerization of olefins
IN83CA1990 IN173199B (fr) 1989-01-31 1990-01-30
NO900435A NO174106C (no) 1989-01-31 1990-01-30 Katalysatorer for polymerisering av olefiner
FI900467A FI103123B1 (fi) 1989-01-31 1990-01-30 Olefiinien polymeroinnissa käytettäviä katalyyttejä
AU48892/90A AU626628B2 (en) 1989-01-31 1990-01-30 Catalysts for the polymerization of olefins
CS90428A CZ281689B6 (cs) 1989-01-31 1990-01-30 Katalyzátor polymerace olefinů
HU94/90A HU218844B (hu) 1989-01-31 1990-01-30 Metallocénvegyületből és alumoxánvegyületből készített olefin polimerizációs katalizátor és eljárás előállítására
MX19309A MX19309A (es) 1989-01-31 1990-01-30 Catalizador para la polimerizacion de olefinas
CA002008906A CA2008906C (fr) 1989-01-31 1990-01-30 Catalyseurs pour la polymerisation d'olefines
YU00173/90A YU17390A (en) 1989-01-31 1990-01-30 Catalysts for olephins polymerization
CN90101414A CN1019579B (zh) 1989-01-31 1990-01-31 制备烯烃聚合催化剂的方法
DE90101893T DE69001565T2 (de) 1989-01-31 1990-01-31 Katalysator für Olefinpolymerisation.
AT90101893T ATE89290T1 (de) 1989-01-31 1990-01-31 Katalysator fuer olefinpolymerisation.
ES199090101893T ES2041053T3 (es) 1989-01-31 1990-01-31 Catalizadores para la polimerizacion de olefinas.
EP90101893A EP0384171B1 (fr) 1989-01-31 1990-01-31 Catalyseur pour la polymérisation d'oléfines
KR1019900001116A KR0145291B1 (ko) 1989-01-31 1990-01-31 올레핀류의 중합용 촉매
BR909000415A BR9000415A (pt) 1989-01-31 1990-01-31 Catalisadores para polimerizacao de olefinas
PT93023A PT93023B (pt) 1989-01-31 1990-01-31 Processo de preparacao de catalisadores para polimerizacao de olefinas
JP2021874A JP2954251B2 (ja) 1989-01-31 1990-01-31 オレフィン重合用触媒
SU904743355A RU1836142C (ru) 1989-01-31 1990-02-27 Способ получени катализатора дл полимеризации олефинов
SU904743351A RU2031901C1 (ru) 1989-01-31 1990-02-27 Способ получения катализатора полимеризации этилена

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT8919253A IT1237398B (it) 1989-01-31 1989-01-31 Catalizzatori per la polimerizzazione di olefine.
IN83CA1990 IN173199B (fr) 1989-01-31 1990-01-30
SU904743351A RU2031901C1 (ru) 1989-01-31 1990-02-27 Способ получения катализатора полимеризации этилена

Publications (1)

Publication Number Publication Date
IN173199B true IN173199B (fr) 1994-03-05

Family

ID=27272005

Family Applications (1)

Application Number Title Priority Date Filing Date
IN83CA1990 IN173199B (fr) 1989-01-31 1990-01-30

Country Status (23)

Country Link
US (1) US5126303A (fr)
EP (1) EP0384171B1 (fr)
JP (1) JP2954251B2 (fr)
KR (1) KR0145291B1 (fr)
CN (1) CN1019579B (fr)
AT (1) ATE89290T1 (fr)
AU (1) AU626628B2 (fr)
BR (1) BR9000415A (fr)
CA (1) CA2008906C (fr)
CZ (1) CZ281689B6 (fr)
DE (1) DE69001565T2 (fr)
ES (1) ES2041053T3 (fr)
FI (1) FI103123B1 (fr)
HU (1) HU218844B (fr)
IL (1) IL93204A (fr)
IN (1) IN173199B (fr)
IT (1) IT1237398B (fr)
MX (1) MX19309A (fr)
NO (1) NO174106C (fr)
PT (1) PT93023B (fr)
RU (1) RU2031901C1 (fr)
YU (1) YU17390A (fr)
ZA (1) ZA90639B (fr)

Families Citing this family (55)

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US5409874A (en) * 1991-06-20 1995-04-25 Mitsui Petrochemical Industries, Ltd. Catalyst for olefin polymerization, process for the polymerization of olefin, and transition metal compound employable for the catalyst
DE69207348T2 (de) * 1991-10-28 1996-06-27 Shell Int Research Katalisatorzusammensetzung
DE69224463T2 (de) * 1991-11-28 1998-07-09 Showa Denko Kk Neues Metallocen und Verfahren zur Herstellung von Polyolefinen unter Verwendung desselben
US5330948A (en) * 1992-03-31 1994-07-19 Northwestern University Homogeneous catalysts for stereoregular olefin polymerization
FI112233B (fi) * 1992-04-01 2003-11-14 Basell Polyolefine Gmbh Katalyytti olefiinipolymerointia varten, menetelmä sen valmistamiseksi ja sen käyttö
US5910464A (en) * 1992-06-18 1999-06-08 Montell Technology Company Bv Catalysts for the polymerization of olefins
US6034196A (en) * 1992-06-18 2000-03-07 Montell Technology Company Bv Super random copolymers of ethylene with olefinic monomers
IT1255514B (it) * 1992-09-24 1995-11-09 Luigi Resconi Copolimeri dell'etilene con monomeri olefinici, processo per la loro preparazione e catalizzatore
US5449650A (en) * 1992-12-08 1995-09-12 Mitsubishi Petrochemical Company Limited Catalyst components for polymerization of olefins and use thereof
US5332706A (en) * 1992-12-28 1994-07-26 Mobil Oil Corporation Process and a catalyst for preventing reactor fouling
US5608019A (en) * 1992-12-28 1997-03-04 Mobil Oil Corporation Temperature control of MW in olefin polymerization using supported metallocene catalyst
US5420220A (en) * 1993-03-25 1995-05-30 Mobil Oil Corporation LLDPE films
IT1256664B (it) 1992-12-28 1995-12-12 Spherilene Srl Composizioni bituminose modificate con materiali poliolefinici.
US5602067A (en) * 1992-12-28 1997-02-11 Mobil Oil Corporation Process and a catalyst for preventing reactor fouling
PT619325E (pt) * 1993-04-07 2002-02-28 Atofina Res Processo e catalisadores para a producao de olefinas
US6468936B1 (en) * 1993-04-28 2002-10-22 Fina Technology, Inc. Solid MAO/metallocene catalyst complex for propylene polymerization
US5455741A (en) * 1993-10-26 1995-10-03 Pulse Engineering, Inc. Wire-lead through hole interconnect device
US5614456A (en) * 1993-11-15 1997-03-25 Mobil Oil Corporation Catalyst for bimodal molecular weight distribution ethylene polymers and copolymers
US5541272A (en) * 1994-06-03 1996-07-30 Phillips Petroleum Company High activity ethylene selective metallocenes
IT1273661B (it) * 1994-07-20 1997-07-09 Spherilene Srl Catalizzatori per la polimerizzazione delle olefine
US5525678A (en) * 1994-09-22 1996-06-11 Mobil Oil Corporation Process for controlling the MWD of a broad/bimodal resin produced in a single reactor
FR2729393B1 (fr) * 1995-01-18 1997-03-21 Bp Chemicals Snc Procede de polymerisation d'olefine
IT1276752B1 (it) * 1995-06-20 1997-11-03 Spherilene S P A Ora Montell I Catalizzatori e procedimenti per la polimerizzazione di olefine
US5882750A (en) * 1995-07-03 1999-03-16 Mobil Oil Corporation Single reactor bimodal HMW-HDPE film resin with improved bubble stability
US6486089B1 (en) 1995-11-09 2002-11-26 Exxonmobil Oil Corporation Bimetallic catalyst for ethylene polymerization reactions with uniform component distribution
US6417130B1 (en) 1996-03-25 2002-07-09 Exxonmobil Oil Corporation One pot preparation of bimetallic catalysts for ethylene 1-olefin copolymerization
US5780659A (en) * 1996-03-29 1998-07-14 Phillips Petroleum Company Substituted indenyl unbridged metallocenes
US6225426B1 (en) 1996-04-10 2001-05-01 Uniroyal Chemical Company, Inc. Process for producing polyolefin elastomer employing a metallocene catalyst
DE19623707A1 (de) * 1996-06-14 1997-12-18 Hoechst Ag Übergangsmetallverbindung
AU3505497A (en) * 1996-07-15 1998-02-09 Mobil Oil Corporation Comonomer pretreated bimetallic catalyst for blow molding and film applications
US6759499B1 (en) * 1996-07-16 2004-07-06 Exxonmobil Chemical Patents Inc. Olefin polymerization process with alkyl-substituted metallocenes
FI972230A (fi) 1997-01-28 1998-07-29 Borealis As Uusi homogeeninen olefiinien polymerointikatalysaattorikoostumus
FI970349A (fi) 1997-01-28 1998-07-29 Borealis As Uudet metalloseeniyhdisteiden aktivaattorisysteemit
US6005463A (en) * 1997-01-30 1999-12-21 Pulse Engineering Through-hole interconnect device with isolated wire-leads and component barriers
DE69737776T2 (de) 1997-07-09 2008-01-31 Maruzen Petrochemical Co., Ltd. Katalysatorbestandteil zur Olefinpolymerisation
US6153551A (en) 1997-07-14 2000-11-28 Mobil Oil Corporation Preparation of supported catalyst using trialkylaluminum-metallocene contact products
US6051525A (en) * 1997-07-14 2000-04-18 Mobil Corporation Catalyst for the manufacture of polyethylene with a broad or bimodal molecular weight distribution
AU1335899A (en) 1997-10-29 1999-05-17 Montell Technology Company B.V. Catalysts for the polymerization of olefins and process for the preparation thereof
US6559252B1 (en) 1997-10-29 2003-05-06 Basell Technology Company Bv Catalysts and processes for the polymerization of olefins
US6444603B1 (en) 1997-12-22 2002-09-03 Mitsui Chemicals, Inc. Catalyst component for ethylenically unsaturated monomer polymerization, catalyst for ethylenically unsaturated monomer polymerization, and process for ethylenically unsaturated monomer polymerization using said catalyst
US6225427B1 (en) 1998-10-15 2001-05-01 Uniroyal Chemical Company, Inc. Olefin polymerization process employing metallocene catalyst provided by cocatalyst activation of a metallocene procatalyst
US6462212B1 (en) 1998-10-23 2002-10-08 Albemarle Corporation Transition metal compounds having conjugate aluminoxate anions and their use as catalyst components
US20040002420A1 (en) * 1998-10-23 2004-01-01 Feng-Jung Wu Stable catalysts and co-catalyst compositions formed from hydroxyaluminoxane and their use
US6555494B2 (en) 1998-10-23 2003-04-29 Albemarle Corporation Transition metal compounds having conjugate aluminoxate anions, their preparation and their use as catalyst components
US6160145A (en) * 1998-10-23 2000-12-12 Albemarle Corporation Transition metal compounds having conjugate aluminoxate anions and their use as catalyst components
US6812182B2 (en) 1998-10-23 2004-11-02 Albemarle Corporation Compositions formed from hydroxyaluminoxane and their use as catalyst components
US6492292B2 (en) 1998-10-23 2002-12-10 Albemarle Corporation Gelatinous compositions formed from hydroxyaluminoxane, solid compositions formed therefrom, and the use of such compositions as catalyst components
DE59914158D1 (de) * 1998-11-25 2007-03-08 Basell Polyolefine Gmbh Metallocenmonohalogenide
AU4716301A (en) * 1999-12-16 2001-06-25 Phillips Petroleum Company Organometal compound catalyst
CN1160381C (zh) * 2001-09-27 2004-08-04 中国石油化工股份有限公司 含双席夫碱配体的烯烃聚合催化剂及制备方法与应用
KR20050035183A (ko) * 2001-11-30 2005-04-15 엑손모빌 케미칼 패턴츠 인코포레이티드 비-단일 부위/단일 부위 촉매 복합물을 이용하여 제조된에틸렌/알파-올레핀 공중합체, 이의 제조 방법 및 용도
US8188170B2 (en) 2006-06-20 2012-05-29 Chemtura Corporation Polymers with low gel content and enhanced gas-fading
US7601255B2 (en) 2006-09-06 2009-10-13 Chemtura Corporation Process for removal of residual catalyst components
US8067652B2 (en) 2009-08-13 2011-11-29 Chemtura Corporation Processes for controlling the viscosity of polyalphaolefins
US9376518B2 (en) * 2013-08-28 2016-06-28 Exxonmobil Chemical Patents Inc. Racemo selective metallation process

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US4490514A (en) * 1983-08-16 1984-12-25 Chemplex Company High-temperature ethylene polymerization and copolymerization using dialuminoxane cocatalysts
DE3443087A1 (de) * 1984-11-27 1986-05-28 Hoechst Ag, 6230 Frankfurt Verfahren zur herstellung von polyolefinen
US4752597A (en) * 1985-12-12 1988-06-21 Exxon Chemical Patents Inc. New polymerization catalyst
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JPH0742301B2 (ja) * 1987-02-14 1995-05-10 三井石油化学工業株式会社 微粒子状アルミノオキサン、その製法およびその用途
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US4931417A (en) * 1987-11-09 1990-06-05 Chisso Corporation Transition-metal compound having a bis-substituted-cyclopentadienyl ligand of bridged structure
US4937301A (en) * 1987-12-17 1990-06-26 Exxon Chemical Patents Inc. Method for preparing a supported metallocene-alumoxane catalyst for gas phase polymerization
US4871705A (en) * 1988-06-16 1989-10-03 Exxon Chemical Patents Inc. Process for production of a high molecular weight ethylene a-olefin elastomer with a metallocene alumoxane catalyst
US4892851A (en) * 1988-07-15 1990-01-09 Fina Technology, Inc. Process and catalyst for producing syndiotactic polyolefins
DE3929693A1 (de) * 1989-09-07 1991-03-14 Hoechst Ag Verfahren zur herstellung eines polyolefinwachses
MY141000A (en) * 1990-04-18 2010-02-12 Mitsui Chemicals Inc Process for the preparation of an ethylene copolymer and an olefin polymer, and catalysts for olefin polymerization

Also Published As

Publication number Publication date
YU17390A (en) 1991-08-31
CZ281689B6 (cs) 1996-12-11
AU4889290A (en) 1990-08-09
NO174106C (no) 1994-03-16
EP0384171B1 (fr) 1993-05-12
HU218844B (hu) 2000-12-28
KR900011794A (ko) 1990-08-02
PT93023B (pt) 1998-04-30
DE69001565T2 (de) 1993-11-18
ES2041053T3 (es) 1993-11-01
CN1044822A (zh) 1990-08-22
IL93204A (en) 1993-03-15
US5126303A (en) 1992-06-30
CN1019579B (zh) 1992-12-23
ATE89290T1 (de) 1993-05-15
JP2954251B2 (ja) 1999-09-27
FI103123B (fi) 1999-04-30
FI103123B1 (fi) 1999-04-30
CZ42890A3 (en) 1996-07-17
ZA90639B (en) 1990-10-31
IT1237398B (it) 1993-06-01
BR9000415A (pt) 1991-01-15
NO174106B (no) 1993-12-06
NO900435D0 (no) 1990-01-30
DE69001565D1 (de) 1993-06-17
EP0384171A1 (fr) 1990-08-29
PT93023A (pt) 1990-07-31
HU900594D0 (en) 1990-04-28
NO900435L (no) 1990-08-01
IL93204A0 (en) 1990-11-05
HUT53132A (en) 1990-09-28
AU626628B2 (en) 1992-08-06
JPH03197514A (ja) 1991-08-28
CA2008906C (fr) 1999-11-16
FI900467A0 (fi) 1990-01-30
MX19309A (es) 1994-03-31
IT8919253A0 (it) 1989-01-31
KR0145291B1 (ko) 1998-07-15
RU2031901C1 (ru) 1995-03-27
CA2008906A1 (fr) 1990-07-31

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