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Publication of MY117441ApublicationCriticalpatent/MY117441A/en
Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications
(AREA)
Polymerisation Methods In General
(AREA)
Abstract
THE PRESENT INVENTION INTENDS TO PROVIDE A METHOD OF PRODUCING A POLYOLEFIN COMPOSITION HAVING A NARROW COMPOSITION DISTRIBUTION AND HAVING NARROW MOLECULAR WEIGHT DISTRIBUTION, AND IS CHARACTERIZED IN THAT WHEN AT LEAST TWO OLEFINS ARE COPOLYMERIZED IN THE PRESENCE OF A TRANSITION METAL COMPOUND CATALYST USING AT LEAST TWO GAS PHASE FLUIDIZED BED REACTORS, A SATURATED ALIPHATIC HYDROCARBON IS ALLOWED TO EXIST IN EACH REACTOR IN A CONCENTRATION FROM 0.1 TO 30 MOL, AND THE RATIO OF THE CONCENTRATION (C2) OF A SATURATED ALIPHATIC HYDROCARBONIN A REACTOR OF A SECOND STAGE TO THE CONCENTRATION (C1) OF A SATURATED ALIPHATIC HYFROCARBON IN A REACTOR OF A FIRST STAGE (C²/C1) IS 0.13 OR MORE. FURTHER, THE PRESENT INVENTION INTENDS TO PROVIDE A METHOD OF PRODUCING A POLYOLEFIN COMPOSITION BY MULTI-STAGE POLYMERIZATION, WHICH CAN PREVENT SHEETING IN THE REACTOR AND CAN GIVE A POLYOLEFIN COMPOSITION STABLY WITH HIGH PRODUCTIVITY, AND IS CHARACTERIZED IN THAT A SATURATED ALIPHATIC HYDROCARBON IS ALLOWED TO EXIST IN A TRANSPORT LINE (25) FOR TRANSPORTING A POLYMER PARTICLE EXTRACTED FROM A FLUIDIZED BED REACTOR (11) IN THE PREVIOUS STAGE TO A FLUIDIZED BED REACTOR (21) IN THE SUBSEQUENT STAGE AT A CONCENTRATION FROM 0.1 TO 30 MOL
MYPI200127692000-07-032001-06-13Processes for producing polyolefin composition
MY117441A
(en)
Homopolymerization of ethylene and copolymerization of ethylene and 1-hexene with bridged metallocene/methylaluminoxane catalysts: the influence of the bridging moiety