Title:
エチレン(コ)ポリマーの製造方法
Document Type and Number:
Japanese Patent JP4790627
Kind Code:
B2
Abstract:
A process for preparing a broad molecular weight polyethylene carried out in the presence of a catalyst system comprising (i) a solid catalyst component comprising Mg, Ti, halogen, and optionally an internal electron donor compound, and (ii) an Al-alkyl cocatalyst said process comprising at least two step of polymerization (a) and (b), in which: in a first step (a) ethylene is polymerized in the presence of a molecular weight regulator in order to produce a ethylene (co)polymer, and in a further step (b), which is carried out in the presence of an external electron donor compound added to this polymerization step as a fresh reactant, ethylene is copolymerized with an alpha olefin of formula CH2═CHR, in which R is a C1-C20 hydrocarbon group, to produce an ethylene copolymer having a molecular weight higher than that of the copolymer produced in step (b).
Inventors:
Baita, pietro
Massive, Covetzi
Gabriel May
Molini, Jean Clown
Putter, Joachim, T., M.
Massive, Covetzi
Gabriel May
Molini, Jean Clown
Putter, Joachim, T., M.
Application Number:
JP2006544251A
Publication Date:
October 12, 2011
Filing Date:
November 24, 2004
Export Citation:
Assignee:
Basel, Polyolefin, Game Beher
International Classes:
C08F4/654; C08F10/00; C08F10/02; C08F210/16
Domestic Patent References:
| JP2003212924A | 2003-07-30 | |||
| JPS57128707A | 1982-08-10 | |||
| JPH1017619A | 1998-01-20 | |||
| JPH1025323A | 1998-01-27 | |||
| JPH08134285A | 1996-05-28 |
Attorney, Agent or Firm:
Shinjiro Ono
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Okimoto Kazuaki
Ken Matsumoto
Minako Matsuyama
Takako Koiso
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Okimoto Kazuaki
Ken Matsumoto
Minako Matsuyama
Takako Koiso