GB799823A - Production of high molecular weight polyethylenes - Google Patents

Production of high molecular weight polyethylenes

Info

Publication number
GB799823A
GB799823A GB1562/55A GB156255A GB799823A GB 799823 A GB799823 A GB 799823A GB 1562/55 A GB1562/55 A GB 1562/55A GB 156255 A GB156255 A GB 156255A GB 799823 A GB799823 A GB 799823A
Authority
GB
United Kingdom
Prior art keywords
aluminium
diethyl
diethyl aluminium
compounds
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
Application number
GB1562/55A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB799823A publication Critical patent/GB799823A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J13/00—Discharge tubes with liquid-pool cathodes, e.g. metal-vapour rectifying tubes
    • H01J13/02—Details
    • H01J13/04—Main electrodes; Auxiliary anodes
    • H01J13/06—Cathodes
    • H01J13/10—Containers for the liquid pool; Arrangements or mounting 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
    • 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
    • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/02—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
    • C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • 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
    • C08F6/00—Post-polymerisation treatments
    • C08F6/02—Neutralisation of the polymerisation mass, e.g. killing the catalyst also removal of catalyst residues
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12—Reaction products
    • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
    • C10M159/22—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/06—Feeding liquid to the spinning head
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0072—Disassembly or repair of discharge tubes
    • H01J2893/0073—Discharge tubes with liquid poolcathodes; constructional details
    • H01J2893/0074—Cathodic cups; Screens; Reflectors; Filters; Windows; Protection against mercury deposition; Returning condensed electrode material to the cathodic cup; Liquid electrode level control
    • H01J2893/0075—Cathodic cups
    • H01J2893/0078—Mounting cathodic cups in the discharge tube

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
GB1562/55A 1954-01-19 1955-01-18 Production of high molecular weight polyethylenes Expired GB799823A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEZ3941A DE1012460B (de) 1953-11-17 1954-01-19 Verfahren zur Herstellung von hochmolekularen Polyaethylenen
DEZ4603A DE1046319B (de) 1954-01-19 1954-12-11 Verfahren zur Herstellung von hochmolekularen Polyaethylenen
DEZ4604A DE1016023B (de) 1954-01-19 1954-12-13 Verfahren zur Herstellung von hochmolekularen Polyaethylenen

Publications (1)

Publication Number Publication Date
GB799823A true GB799823A (en) 1958-08-13

Family

ID=43499864

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1562/55A Expired GB799823A (en) 1954-01-19 1955-01-18 Production of high molecular weight polyethylenes

Country Status (7)

Country Link
BE (1) BE534792A (xx)
CH (1) CH363485A (xx)
DE (3) DE1012460B (xx)
FR (1) FR1123617A (xx)
GB (1) GB799823A (xx)
LU (1) LU33306A1 (xx)
NL (1) NL94705C (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082234A (en) * 1960-11-03 1963-03-19 United States Borax Chem Preparation of thioaryloxides and alkyl aluminum thioaryloxides
US3245976A (en) * 1961-07-17 1966-04-12 Snam Societa Per Azioni Process for preparing 1, 4-cis-butadiene high polymers
US3281443A (en) * 1961-02-24 1966-10-25 Continental Oil Co Preparation and use of dialkoxyaluminum hydride reducing agents
US3311604A (en) * 1961-02-04 1967-03-28 Snam Spa Process for polymerizing isoprene with a catalyst consisting of titanium tetrachloride and an aluminum hydride
US4055634A (en) * 1974-02-22 1977-10-25 Hoffmann-La Roche, Inc. Antiperspirants
US4129702A (en) * 1973-08-19 1978-12-12 Imperial Chemical Industries Limited Polymerizing unsaturated halides with carbamate type metallic catalyst
US6462153B1 (en) * 1996-04-03 2002-10-08 Occidental Chemical Corporation Method of polymerizing vinyl chloride monomer
WO2006043985A1 (en) 2004-06-16 2006-04-27 Dow Global Technologies Inc. Method for identifying ziegler-natta cocatalyst
US7741417B2 (en) 2004-01-07 2010-06-22 Exxonmobil Chemical Patents Inc. Preparation of polymerization catalyst activators utilizing indole-modified silica supports
US8022005B2 (en) 2007-11-08 2011-09-20 Exxonmobil Chemical Patents Inc. Halogen substituted heterocyclic heteroatom containing ligands-alumoxane activation of metallocenes
CN106916239A (zh) * 2017-03-22 2017-07-04 山东东方宏业化工有限公司 一种窄分子量分布的聚丁烯‑1的制备方法

Families Citing this family (152)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899418A (en) * 1959-08-11 Polymerization of olefins by mechanical activation process
US3085084A (en) * 1954-08-16 1963-04-09 Du Pont Polymerization catalyst and process
DE1209747B (de) * 1954-10-30 1966-01-27 Bergwerksgesellschaft Hibernia Verfahren zur Herstellung von Polymerisaten aliphatischer Olefinkohlenwasserstoffe
BE543082A (xx) * 1954-11-27
US3094514A (en) * 1958-02-13 1963-06-18 Goodrich Gulf Chem Inc Polymerization process for aliphatic, conjugated dienes
NL202827A (xx) * 1954-12-16
IT549626A (xx) * 1955-01-05
NL203951A (xx) * 1955-02-04
BE559614A (xx) * 1955-02-19
NL250824A (xx) * 1955-03-08
US2909512A (en) * 1955-03-25 1959-10-20 Du Pont Ethylene polymerization using a solid catalyst
US2908674A (en) * 1955-04-25 1959-10-13 Phillips Petroleum Co Process and catalyst for production of olefin polymers
US2920066A (en) * 1955-04-25 1960-01-05 Phillips Petroleum Co Process and catalyst for production of olefin polymers
US3026290A (en) * 1955-05-11 1962-03-20 Monsanto Chemicals Process of polymerizing a vinyl ether with a trialkyl-aluminum titanium tetrachloride catalyst
US2918458A (en) * 1955-05-23 1959-12-22 Phillips Petroleum Co Process and catalyst for production of olefin polymers
US3112299A (en) * 1955-06-03 1963-11-26 Shell Oil Co Separation of catalysts from alkylene resins
BE548394A (xx) * 1955-06-06
US2918459A (en) * 1955-06-13 1959-12-22 Phillips Petroleum Co Process and catalyst for production of olefin polymers
DE1063804B (de) * 1955-06-14 1959-08-20 Huels Chemische Werke Ag Verfahren zur Herstellung von Polyaethylen
NL208687A (xx) * 1955-07-05
BE549448A (xx) * 1955-07-11
US3219649A (en) * 1955-07-11 1965-11-23 Phillips Petroleum Co Process and catalyst for production of olefin polymers
BE550088A (xx) * 1955-08-04
DE1269810B (de) * 1955-08-05 1968-06-06 Basf Ag Verfahren zur Herstellung von Polymerisaten von Olefinkohlenwasserstoffen
BE549891A (xx) * 1955-08-06
BE550429A (xx) * 1955-08-19
US2907805A (en) * 1955-08-19 1959-10-06 Hoechst Ag Process for the preparation of liquid ethylene polymers
NL98479C (xx) * 1955-08-22
US2882264A (en) * 1955-10-10 1959-04-14 Dow Chemical Co Polymerization of ethylene
US2843577A (en) * 1955-10-17 1958-07-15 Standard Oil Co Process and catalyst for polymerization using polyvalent metal salts and a reducing agent plus a sulfur compound
IT560986A (xx) * 1955-10-20
BE551997A (xx) * 1955-10-21
US2904542A (en) * 1955-10-25 1959-09-15 Exxon Research Engineering Co Olefin polymerization process
US2976271A (en) * 1955-10-28 1961-03-21 Exxon Research Engineering Co Propylene polymerization
IT561363A (xx) * 1955-10-28
BE552578A (xx) * 1955-11-14
US2887471A (en) * 1955-11-29 1959-05-19 Eastman Kodak Co Polymerization of alpha-olefins to solid polymer by means of an alkali metal alkyl and a supported oxide
US3086964A (en) * 1955-11-29 1963-04-23 Eastman Kodak Co Catalytic polymerization of alpha-olefins to solid polymers with catalyst mixtures of a metal, a metal tetraalkyl, and a titanium tetrahalide
US2912424A (en) * 1955-11-29 1959-11-10 Eastman Kodak Co Polymerization of alpha-olefins to solid polymers with catalytic mixtures of aluminum metal, a titanium compound and a tetra substituted ammonium salt
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GB838028A (en) * 1955-12-01 1960-06-22 Exxon Research Engineering Co Polymerization catalyst
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NL97323C (xx) * 1955-12-09
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NL213149A (xx) * 1955-12-22
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BE553722A (xx) * 1955-12-27
US2824090A (en) * 1955-12-27 1958-02-18 Eastman Kodak Co Polymerization of alpha-olefins with a catalyst mixture of an orthotitanate and an alkyl aluminum halide
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US3024227A (en) * 1955-12-30 1962-03-06 Phillips Petroleum Co Low pressure process for production of olefin polymers with a peroxide containing catalyst
US2944048A (en) * 1955-12-30 1960-07-05 Phillips Petroleum Co Process and catalyst for production of olefin polymers
US2969408A (en) * 1955-12-30 1961-01-24 Phillips Petroleum Co Process and catalyst for polymerization of olefins
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NL103545C (xx) * 1956-01-18
US3078264A (en) * 1956-01-30 1963-02-19 Celanese Corp Polymerization of ethylene and catalyst therefor
GB825882A (en) * 1956-01-30 1959-12-23 Phillips Petroleum Co Process for producing modified polymers
IT572923A (xx) * 1956-02-02
DE1205281B (de) * 1956-02-04 1965-11-18 Huels Chemische Werke Ag Verfahren zur Herstellung von Niederdruck-Polyaethylen mit bestimmtem mittlerem Polymerisationsgrad
US2911400A (en) * 1956-02-09 1959-11-03 Spencer Chem Co Diarylcadmium-titanium tetrachloride polymerization initiator and process
US2911399A (en) * 1956-02-09 1959-11-03 Spencer Chem Co Diphenylzinc-titanium tetrachloride polymerization initiator and process
US2951061A (en) * 1956-02-16 1960-08-30 Phillips Petroleum Co Process and apparatus for contacting materials
US2911401A (en) * 1956-02-20 1959-11-03 Spencer Chem Co Di-alpha-naphthylzinc-titanium tetrachloride polymerization initiator and process
FR1172337A (fr) * 1956-02-23 1959-02-09 Exxon Research Engineering Co Procédé et installation de polymérisation continue
DE1420249A1 (de) * 1956-02-28 1968-10-10 Huels Chemische Werke Ag Verfahren zur Herstellung von Niederdruck-Polyaethylen hohen Polymerisationsgrades
US2919267A (en) * 1956-03-28 1959-12-29 Standard Oil Co Polymerization catalysts and processes
US3111505A (en) * 1956-04-04 1963-11-19 Hercules Powder Company Inc Process for preparing polymers and copolymers of vinyl chloride
US2930785A (en) * 1956-04-05 1960-03-29 Phillips Petroleum Co Process and catalyst for production of olefin polymers
US2964510A (en) * 1956-04-09 1960-12-13 Exxon Research Engineering Co Butene-1 polymerization
NL216345A (xx) * 1956-04-16
DE1180135B (de) * 1956-04-18 1964-10-22 Du Pont Verfahren zur katalytischen Polymerisation von Alkenen
US3038863A (en) * 1956-05-15 1962-06-12 Du Pont Polymerization catalyst
US3042626A (en) * 1956-05-21 1962-07-03 Du Pont Polymerization catalyst and process
BE557853A (xx) * 1956-05-28
US3084144A (en) * 1956-07-02 1963-04-02 Minnesota Mining & Mfg Process for polymerization of fluorinecontaining organic compounds
US2898328A (en) * 1956-07-10 1959-08-04 Ici Ltd Polymerisation of olefins
NL218708A (xx) * 1956-07-11 1900-01-01
BE557561A (xx) * 1956-08-02
BE559842A (xx) * 1956-08-06
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US3107236A (en) * 1956-12-17 1963-10-15 Sun Oil Co Preparation of polypropylene
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US2914517A (en) * 1956-12-24 1959-11-24 Universal Oil Prod Co Polymerization of olefins to solid polymers
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US3004962A (en) * 1957-05-27 1961-10-17 Hercules Powder Co Ltd Process for polymerization of 1-olefins
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US2961435A (en) * 1957-05-27 1960-11-22 Hercules Powder Co Ltd Process for polymerization of ethylene with a titanium monoxide catalyst
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US3135725A (en) * 1957-05-31 1964-06-02 Goodrich Gulf Chem Inc Process of polymerizing conjugated diolefins with a cobalt salt-hydrocarbyl aluminumcompound catalyst
US3023198A (en) * 1957-06-03 1962-02-27 Phillips Petroleum Co Polymerization of vinyl ethers
BE568789A (xx) * 1957-06-26
US2935498A (en) * 1957-07-01 1960-05-03 Eastman Kodak Co Polymerization of alpha-olefins to solid polymers with a three-component catalyst
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US2967206A (en) * 1957-10-28 1961-01-03 Sun Oil Co Method of preparing polypropylene with a sub chloride of zirconium or titanium activated by mono alkyl aluminum dihalide
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US3095383A (en) * 1957-11-06 1963-06-25 Grace W R & Co Ethylene polymerization catalyst prepared by grinding titanium and iodine
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US2962487A (en) * 1958-03-31 1960-11-29 Eastman Kodak Co Three-component aluminum-titanium tetrahalide catalyst for olefin polymerization therewith
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DE1257431B (de) * 1965-02-03 1967-12-28 Snam Spa Verfahren zur Polymerisation von Butadien
JPS5020797B1 (xx) * 1971-07-19 1975-07-17
US4224181A (en) * 1979-03-07 1980-09-23 Exxon Research & Engineering Co. Ziegler type catalyst system
US4224182A (en) * 1979-03-07 1980-09-23 Exxon Research & Engineering Co. Novel hindered alkyl aluminum amide cocatalysts

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GB682420A (en) * 1949-06-10 1952-11-12 Du Pont Improvements in or relating to the polymerisation of ethylene
DE878560C (de) * 1950-06-22 1953-06-05 Karl Dr Ziegler Verfahren zur Polymerisation und Mischpolymerisation von Olefinen

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US3082234A (en) * 1960-11-03 1963-03-19 United States Borax Chem Preparation of thioaryloxides and alkyl aluminum thioaryloxides
US3311604A (en) * 1961-02-04 1967-03-28 Snam Spa Process for polymerizing isoprene with a catalyst consisting of titanium tetrachloride and an aluminum hydride
US3281443A (en) * 1961-02-24 1966-10-25 Continental Oil Co Preparation and use of dialkoxyaluminum hydride reducing agents
US3245976A (en) * 1961-07-17 1966-04-12 Snam Societa Per Azioni Process for preparing 1, 4-cis-butadiene high polymers
US4129702A (en) * 1973-08-19 1978-12-12 Imperial Chemical Industries Limited Polymerizing unsaturated halides with carbamate type metallic catalyst
US4055634A (en) * 1974-02-22 1977-10-25 Hoffmann-La Roche, Inc. Antiperspirants
US6462153B1 (en) * 1996-04-03 2002-10-08 Occidental Chemical Corporation Method of polymerizing vinyl chloride monomer
US7741417B2 (en) 2004-01-07 2010-06-22 Exxonmobil Chemical Patents Inc. Preparation of polymerization catalyst activators utilizing indole-modified silica supports
WO2006043985A1 (en) 2004-06-16 2006-04-27 Dow Global Technologies Inc. Method for identifying ziegler-natta cocatalyst
US7683003B2 (en) 2004-06-16 2010-03-23 Dow Global Technologies, Inc. Method for identifying Ziegler-Natta cocatalysts
US8022005B2 (en) 2007-11-08 2011-09-20 Exxonmobil Chemical Patents Inc. Halogen substituted heterocyclic heteroatom containing ligands-alumoxane activation of metallocenes
CN106916239A (zh) * 2017-03-22 2017-07-04 山东东方宏业化工有限公司 一种窄分子量分布的聚丁烯‑1的制备方法

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Publication number Publication date
DE1016023B (de) 1957-09-19
DE1012460B (de) 1957-07-18
CH363485A (de) 1962-07-31
DE1046319B (de) 1958-12-11
FR1123617A (fr) 1956-09-25
BE534792A (xx) 1955-01-31
LU33306A1 (xx) 1955-03-11
NL94705C (xx) 1960-07-15

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