Sumitomo Chemical Company, Limited

Jun Kawashima

Katsunari Inagaki

Tatsuo Sassa

Hisakatsu Hama

There are provided (I) a process for producing a copolymer of ethylene, an &#x3b1;-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those monomers in a polymerization reactor by feeding the following components (A), (B), (C1) and (D) to the polymerization reactor:

Process for producing copolymer

Disclosed is a process for producing an ethylene-&#x3b1;-olefin copolymer excellent in balancing between strength and elongation by continuous multi-step polymerization. The process comprises continuously polymerizing ethylene and &#x3b1;-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.

Process for producing ethylene-&#x3b1;-olefin copolymer

The present invention provides a process for producing an ethylene-&#x3b1;-olefin-unconjugated polyene random copolymer in an aliphatic hydrocarbon solvent under conditions of high-temperature and high-activity. The process comprises polymerizing at least the following components (a)-(c) in an aliphatic hydrocarbon solvent in the presence of a catalyst comprising (A) a transition metal complex having at least one cyclopentadienyl skeleton and (B) an organoaluminum compound and (C) a boron compound as co-catalysts wherein at least a part of the polyene (c) and at least a part of the boron compound (C) are previously contacted with each other before they are introduced into a polymerization reactor:

Growing community of inventors

Ichihara, Japan

Jun Kawashima