Title:
オレフィン類の気相重合方法
Document Type and Number:
Japanese Patent JP4987722
Kind Code:
B2
Abstract:
Process for the gas-phase polymerization of one or more alpha-olefins in the presence of a catalyst system, the process comprising: contacting in a continuous way one or more of said alpha-olefins with said catalyst system in a prepolymerization reactor, wherein the reaction is carried out in a liquid medium at a temperature ranging from 23° to 50° C.; feeding in continuous the prepolymer obtained in step a) into a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization or transport conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into said riser; wherein the prepolymer obtained from step a) is continuously fed at a section of said riser characterized by an upwardly gas velocity higher than 3.0 m/s.
Inventors:
May, Cabriere
Cobbetsi, Massimo
Bertolini, Stefano
Cobbetsi, Massimo
Bertolini, Stefano
Application Number:
JP2007536140A
Publication Date:
July 25, 2012
Filing Date:
September 19, 2005
Export Citation:
Assignee:
Basel, Polyolefin, Italy, Sochieta, A Responsorabilita, Limitata
International Classes:
C08F2/34; C08F2/04; C08F10/00
Domestic Patent References:
| JP10506432A | ||||
| JP6041234A | ||||
| JP6228211A | ||||
| JP9501733A |
Attorney, Agent or Firm:
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Ken Matsumoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Ken Matsumoto