MX19411A - Mejoras en metodo para la produccion de materiales acidos mono- o dicarboxilicos substituidos con hidrocarbilo de cadena larga - Google Patents

Mejoras en metodo para la produccion de materiales acidos mono- o dicarboxilicos substituidos con hidrocarbilo de cadena larga

Info

Publication number
MX19411A
MX19411A MX1941190A MX1941190A MX19411A MX 19411 A MX19411 A MX 19411A MX 1941190 A MX1941190 A MX 1941190A MX 1941190 A MX1941190 A MX 1941190A MX 19411 A MX19411 A MX 19411A
Authority
MX
Mexico
Prior art keywords
mono
production
long
chain hydrocarbon
materials substituted
Prior art date
Application number
MX1941190A
Other languages
English (en)
Inventor
Jai Gopal Bansal
Original Assignee
Exxon Chemical Patents Inc
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 Exxon Chemical Patents Inc filed Critical Exxon Chemical Patents Inc
Publication of MX19411A publication Critical patent/MX19411A/es

Links

Classifications

    • 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
    • C08F8/00Chemical modification by after-treatment
    • C08F8/18Introducing halogen atoms or halogen-containing groups
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M159/00Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12Reaction products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18Stationary reactors having moving elements inside
    • 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
    • C08F8/00Chemical modification by after-treatment
    • C08F8/18Introducing halogen atoms or halogen-containing groups
    • C08F8/20Halogenation
    • C08F8/22Halogenation by reaction with free halogens
    • 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
    • C08F8/00Chemical modification by after-treatment
    • C08F8/46Reaction with unsaturated dicarboxylic acids or anhydrides thereof, e.g. maleinisation
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/86Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of 30 or more atoms
    • C10M129/92Carboxylic acids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/86Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of 30 or more atoms
    • C10M129/95Esters
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/52Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of 30 or more atoms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049Controlling or regulating processes
    • B01J2219/00051Controlling the temperature
    • B01J2219/00074Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/00101Reflux columns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049Controlling or regulating processes
    • B01J2219/00051Controlling the temperature
    • B01J2219/00074Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00105Controlling the temperature by indirect heating or cooling employing heat exchange fluids part or all of the reactants being heated or cooled outside the reactor while recycling
    • B01J2219/00108Controlling the temperature by indirect heating or cooling employing heat exchange fluids part or all of the reactants being heated or cooled outside the reactor while recycling involving reactant vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049Controlling or regulating processes
    • B01J2219/00164Controlling or regulating processes controlling the flow
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00761Details of the reactor
    • B01J2219/00763Baffles
    • B01J2219/00765Baffles attached to the reactor wall
    • B01J2219/00768Baffles attached to the reactor wall vertical
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/282Esters of (cyclo)aliphatic oolycarboxylic acids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/287Partial esters
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/287Partial esters
    • C10M2207/288Partial esters containing free carboxyl groups
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/287Partial esters
    • C10M2207/289Partial esters containing free hydroxy groups
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/34Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2215/042Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/26Amines
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/046Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/06Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061Esters derived from boron
MX1941190A 1989-02-07 1990-02-07 Mejoras en metodo para la produccion de materiales acidos mono- o dicarboxilicos substituidos con hidrocarbilo de cadena larga MX19411A (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000590328A CA1338288C (en) 1989-02-07 1989-02-07 Method for the production of long chain hydrocarbyl substituted mono- or dicarboxylic acid materials

Publications (1)

Publication Number Publication Date
MX19411A true MX19411A (es) 1993-06-01

Family

ID=4139581

Family Applications (1)

Application Number Title Priority Date Filing Date
MX1941190A MX19411A (es) 1989-02-07 1990-02-07 Mejoras en metodo para la produccion de materiales acidos mono- o dicarboxilicos substituidos con hidrocarbilo de cadena larga

Country Status (13)

Country Link
EP (1) EP0382450B1 (es)
JP (1) JP2877871B2 (es)
KR (1) KR0160124B1 (es)
AR (1) AR245148A1 (es)
AT (1) ATE124426T1 (es)
AU (1) AU619950B2 (es)
BR (1) BR9000505A (es)
CA (1) CA1338288C (es)
DE (1) DE69020376T2 (es)
DK (1) DK0382450T3 (es)
ES (1) ES2073518T3 (es)
IN (1) IN178933B (es)
MX (1) MX19411A (es)

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US5214224A (en) * 1992-07-09 1993-05-25 Comer David G Dispersing asphaltenes in hydrocarbon refinery streams with α-olefin/maleic anhydride copolymer
AU679809B2 (en) * 1994-01-28 1997-07-10 Lubrizol Corporation, The Treatment of organic compounds to reduce chlorine level
GB2301104B (en) * 1995-05-23 1998-11-11 Ethyl Petroleum Additives Ltd Process for the preparation of polyalkene-substituted succinic acylating agents
US5674819A (en) * 1995-11-09 1997-10-07 The Lubrizol Corporation Carboxylic compositions, derivatives,lubricants, fuels and concentrates
US5891953A (en) * 1996-02-09 1999-04-06 Exxon Chemical Patents Inc Process for preparing polyalkenyl substituted mono- and dicarboxylic acid producing materials (PT-1302)
US5777025A (en) * 1996-02-09 1998-07-07 Exxon Chemical Patents Inc. Process for preparing polyalkenyl substituted C4 to C10 dicarboxylic acid producing materials
US5773567A (en) * 1996-06-17 1998-06-30 Exxon Chemical Patents Inc Carboxylic amide-containing polymers for use as fuel or lubricating oil additives and processes for their preparation
US6562904B2 (en) 2001-06-25 2003-05-13 Infineum International Ltd. Polyalkene-substituted carboxylic acid compositions having reduced chlorine content
US6734148B2 (en) * 2001-12-06 2004-05-11 Infineum International Ltd. Dispersants and lubricating oil compositions containing same
US6743757B2 (en) * 2001-12-06 2004-06-01 Infineum International Ltd. Dispersants and lubricating oil compositions containing same
US8513169B2 (en) 2006-07-18 2013-08-20 Infineum International Limited Lubricating oil compositions
US20080182768A1 (en) 2007-01-31 2008-07-31 Devlin Cathy C Lubricant composition for bio-diesel fuel engine applications
US20090186784A1 (en) 2008-01-22 2009-07-23 Diggs Nancy Z Lubricating Oil Composition
US8420583B2 (en) 2008-01-24 2013-04-16 Afton Chemical Corporation Olefin copolymer dispersant VI improver and lubricant compositions and uses thereof
US9181511B2 (en) 2009-04-01 2015-11-10 Infineum International Limited Lubricating oil composition
CN102365353A (zh) 2009-04-07 2012-02-29 英菲诺姆国际有限公司 船舶发动机润滑
EP2290041B1 (en) 2009-08-24 2012-08-29 Infineum International Limited Use of an ashless borated dispersant
US8415284B2 (en) 2009-11-05 2013-04-09 Afton Chemical Corporation Olefin copolymer VI improvers and lubricant compositions and uses thereof
ES2712955T3 (es) 2012-11-02 2019-05-16 Infineum Int Ltd Lubricación de motor marino
DK2735603T3 (en) 2012-11-21 2016-08-29 Infineum Int Ltd Lubrication to a marine engine
ES2608805T3 (es) 2013-02-07 2017-04-17 Infineum International Limited Lubricación de motor marino
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US11034912B2 (en) 2014-04-29 2021-06-15 Infineum International Limited Lubricating oil compositions
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KR102262949B1 (ko) * 2014-12-23 2021-06-09 에스케이이노베이션 주식회사 무수당 알코올의 생산과 증류를 동시에 수행하는 연속 반응기 및 이를 이용한 무수당 알코올의 제조방법
CA2938020C (en) 2015-08-26 2023-07-04 Infineum International Limited Lubricating oil compositions
CN108611189B (zh) * 2016-12-09 2023-02-21 丰益(上海)生物技术研发中心有限公司 一种控制油脂中双酚a和烷基酚的精炼工艺
EP3369802B1 (en) 2017-03-01 2019-07-10 Infineum International Limited Improvements in and relating to lubricating compositions
BR112019022507B1 (pt) 2017-04-27 2022-12-13 Shell Internationale Research Maatschappij B.V. Uso de um dispersante sem cinzas contendo nitrogênio em uma composição lubrificante
PL3421576T3 (pl) 2017-06-30 2020-08-24 Infineum International Limited Sposób przeciwdziałania zanieczyszczeniu podczas rafinacji
CN107376819A (zh) * 2017-09-20 2017-11-24 江苏垶恒复合材料有限公司 一种具有清洗过滤功能的化工纤维反应釜
EP3461877B1 (en) 2017-09-27 2019-09-11 Infineum International Limited Improvements in and relating to lubricating compositions08877119.1
US10731103B2 (en) 2017-12-11 2020-08-04 Infineum International Limited Low ash and ash-free acid neutralizing compositions and lubricating oil compositions containing same
JP7105445B2 (ja) * 2018-10-04 2022-07-25 住友金属鉱山株式会社 反応装置
JP2020109161A (ja) 2018-12-20 2020-07-16 インフィニューム インターナショナル リミテッド 炭化水素船舶用燃料油
JP2020114912A (ja) 2018-12-20 2020-07-30 インフィニューム インターナショナル リミテッド 油汚損防止剤および/または抗アスファルテン塊状凝集プロセス
CN110142017B (zh) * 2019-05-24 2021-10-22 上海崟澈技术工程有限公司 一种氯化高聚物一体化生产平台
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CN111187605B (zh) * 2020-02-11 2021-01-15 海兴县新源化工有限公司 一种用于低温冷输管路的石油减阻降粘剂及制备装置及制备方法
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ATE45564T1 (de) * 1984-02-09 1989-09-15 Lubrizol Corp Herstellungsverfahren fuer substituierte karbonsaeuren und deren abkoemmlinge.
CA1339530C (en) * 1987-05-18 1997-11-04 Antonio Gutierrez Polyolefinic succinimide polyamine alkyl acetoacetate adduct dispersants

Also Published As

Publication number Publication date
AU4911390A (en) 1990-08-16
ES2073518T3 (es) 1995-08-16
EP0382450B1 (en) 1995-06-28
AU619950B2 (en) 1992-02-06
DE69020376T2 (de) 1995-11-02
EP0382450A3 (en) 1991-10-16
JP2877871B2 (ja) 1999-04-05
JPH02289689A (ja) 1990-11-29
DK0382450T3 (da) 1995-11-20
KR0160124B1 (ko) 1999-01-15
EP0382450A2 (en) 1990-08-16
CA1338288C (en) 1996-04-30
IN178933B (es) 1997-07-19
ATE124426T1 (de) 1995-07-15
DE69020376D1 (de) 1995-08-03
AR245148A1 (es) 1993-12-30
BR9000505A (pt) 1991-01-15
KR900012880A (ko) 1990-09-03

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