Title:
エチレンを重合するための多段階方法
Document Type and Number:
Japanese Patent JP5837424
Kind Code:
B2
Abstract:
The present invention relates to a slurry process for preparing an ethylene polymer having a melt flow ratio F/P, according to ASTM 1238, of higher than 25, carried out in two or more stages of polymerization at temperatures in the range from 60 to 120° C., in which at least two of the said two or more polymerization stages are carried out under different concentration of a molecular weight regulator, said process being carried out in the presence of a catalyst system comprising the product obtained by contacting (A) a solid catalyst component comprising Ti, Mg, halogen, and having a porosity (PF), measured by the mercury method and due to pores with radius equal to, or lower than, 1 mum of at least 0.3 cm3/g and a surface area determined by BET method, of lower than 100 m2/g, and (B) of an organoaluminum compound.
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Inventors:
Brita, Diego
Corina, Gianni
Corina, Gianni
Application Number:
JP2011551457A
Publication Date:
December 24, 2015
Filing Date:
February 15, 2010
Export Citation:
Assignee:
Basel, Polyolefin, Game Beher
International Classes:
C08F4/654; C08F10/02
Domestic Patent References:
| JP49065999A | ||||
| JP62025106A | ||||
| JP2007522305A |
Foreign References:
| WO2008074674A1 | ||||
| WO2008077770A1 | ||||
| EP0057420A1 | ||||
| GB1577512A | ||||
| EP0649860A1 |
Attorney, Agent or Firm:
Satoshi Eto