Title:
多峰性ポリエチレンパイプ
Document Type and Number:
Japanese Patent JP7181858
Kind Code:
B2
Abstract:
The present invention relates to a process for preparing a multimodal multimodal polyethylene composition in the reactor system according to any of the claims 1 to 3, comprising;
(a) polymerizing ethylene in an inert hydrocarbon medium in the first reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and hydrogen in an amount of 0.1-95% by mol with respect to the total gas present in the vapor phase in the first reactor to obtain a low molecular weight polyethylene or medium molecular weight polyethylene;
(b) removing in the hydrogen removal unit 98.0 to 99.8% by weight of the hydrogen comprised in a slurry mixture obtained from the first reactor at a pressure in the range of 103-145 kPa (abs) and transferring the obtained residual mixture to the second reactor;
(c) polymerizing ethylene and optionally C 4 to C 12 ±-olefin comonomer in the second reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and in the presence of hydrogen in an amount obtained in step (b) to obtain a first high molecular weight polyethylene or a first ultra high molecular weight polyethylene in the form of a homopolymer or a copolymer and transferring a resultant mixture to the third reactor; and
(d) polymerizing ethylene, and optionally C 4 to C 12 ±-olefin comonomer in the third reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and hydrogen, wherein the amount of hydrogen in the third reactor is in a range of 0.1-70% by mol, preferably 0.1-60% by mol with respect to the total gas present in the vapor phase in the third reactor or optionally substantial absence of hydrogen to obtain a second high molecular weight polyethylene or a second ultra high molecular weight polyethylene homopolymer or copolymer;
a multimodal polyethylene composition obtainable this way and a pipe prepared therefrom.
Inventors:
Suchao-Inn, Nattaporn
Chromkamol, Warachad
Chromkamol, Warachad
Application Number:
JP2019513750A
Publication Date:
December 01, 2022
Filing Date:
September 07, 2017
Export Citation:
Assignee:
Thai Polyethylene Company Limited
SCG Chemicals Company, Limited
SCG Chemicals Company, Limited
International Classes:
C08F10/02; C08F2/00; C08F2/01
Domestic Patent References:
| JP2006512475A | ||||
| JP2019526686A | ||||
| JP2019526647A | ||||
| JP2019529584A | ||||
| JP2019526688A | ||||
| JP2019526687A | ||||
| JP2009508975A | ||||
| JP2003510429A | ||||
| JP2015505573A | ||||
| JP63075009A | ||||
| JP57128707A | ||||
| JP2014208770A |
Foreign References:
| WO2008049551A1 | ||||
| WO2015102423A1 |
Attorney, Agent or Firm:
Hiroshi Kobayashi
Norio Omori
Iguchi Tsukasa
Yasuhito Suzuki
Norio Omori
Iguchi Tsukasa
Yasuhito Suzuki