Abstract The invention relates to a process for preparing ethylene polymers by polymerising or copolymerising ethylene under conditions such that the ethylene undergoes both free-radical and ionic polymerisation. The process is carried out in a polymerisation reactor under a pressure of at least 1000 bars and at a temperature of 220* to 270*C. in the presence of a catalyst comprising titanium trichloride and/or a titanium alkoxide and an alkylaluminium or alkenylaluminium compound, the dwell time of the catalyst in the reactor being at most 150 seconds. Various procedures are described for adjusting the relative proportions of free-radical polymerisation and ionic polymerisation and of thereby obtaining a wide range of ethylene polymers having differing properties.
Inventors
👤 Pierre Gloriod
👤 Bernard Levresse
👤 Jean-Pierre Machon
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-24 02:01
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A CONTINUOUS PROCESS FOR THE PREPARATION OF ETHYLENE POLYMERS BY POLYMERISATION OR COPOLYMERISATION OF ETHYLENE IN A POLYMERISATION REACTOR AT A PRESSURE OF AT LEAST 1000 BARS AND AT A TEMPERATURE OF FROM 220* TO 270*C. IN THE PRESENCE OF A CATALYST OF THE ZIEGLER TYPE, THE DWELL TIME OF THE CATALYST IN THE REACTOR BEING NOT MORE THAN 1.50 SECONDS, THE CATALYST COMPRISING AN ORGANIC COMPOUND OF ALUMINUM SELECTED FROM THE GROUP CONSISTING OF TRIALKYLALUMINUM AND DIETHYLALUMINUM CHLORIDE; AND TITANIUM TRICHLORIDE AND A TITANIUM TETRAPROPOXIDE, THE RELATIVE RATIO OF TITANIUM TETRAPROPOXIDE TO TITANIUM TRICHLORIDE BEING BETWEEN 1:2 AND 1:8 MOLES FOR CONTROLLING THE RELATIVE DEGREE OF FREE RADICAL POLYMERISTATION AND IONIC POLYMERISATION.
Claim 2
Dependent Claim
113 words
A CONTINUOUS PROCESS FOR THE PREPARATION OF ETHYLENE POLYMERS BY POLYMERISATION OR COPOLYMERISATION OF ETHYLENE IN A POLYMERISATION REACTOR AT A PRESSURE OF AT LEAST 1000 BARS AND AT A TEMPERATURE OF FROM 220* TO 270*C. IN THE PRESENCE OF A CATALYST OF THE ZIEGLER TYPE, THE DWELL TIME OF THE CATALYST IN THE REACTOR BEING NOT MORE THAN 1.50 SECONDS, THE CATALYST COMPRISING AN ORGANIC COMPOUND OF ALUMINUM SELECTED FROM THE GROUP CONSISTING OF TRIALKYLALUMINUM AND DIETHYLALUMINUM CHLORIDE; AND TITANIUM TRICHLORIDE AND A TITANIUM TETRAPROPOXIDE, THE RELATIVE RATIO OF TITANIUM TETRAPROPOXIDE TO TITANIUM TRICHLORIDE BEING BETWEEN 1:2 AND 1:8 MOLES FOR CONTROLLING THE RELATIVE DEGREE OF FREE RADICAL POLYMERISTATION AND IONIC POLYMERISATION.