Process for producing ethylene-α-olefin copolymer

Details Process for producing ethylene-α-olefin copolymer Process for producing ethylene-α-olefin copolymer

2008-01-29

2010-10-05

Cheung, William K (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

C526S089000, C526S348000, C422S129000

Reexamination Certificate

active

07807760

ABSTRACT:
Disclosed is a process for producing an ethylene-α-olefin copolymer excellent in balancing between strength and elongation by continuous multi-step polymerization. The process comprises continuously polymerizing ethylene and α-olefin in a solvent in the presence of an olefin polymerization catalyst using a polymerization reaction apparatus comprising two or more tanks of polymerization reactors connected in series, said process including a first polymerization step of producing in one tank of polymerization reactor a polymer component under the polymerization condition of a flow state being 1.5 or more tanks in the perfect mixing cell model, and a second polymerization step of producing in one tank of polymerization reactor a polymer component under specific polymerization conditions.

REFERENCES:
patent: 2007/0100103 (2007-05-01), Lim et al.
patent: 55-36251 (1980-03-01), None
patent: 2002-505357 (2002-02-01), None

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