Sumitomo Chemical Company, Limited

Tomoaki Goto

Yasutoyo Kawashima

Yoshimitsu Onodera

Kazuki Wakamatsu

Yuki Iseki

Shinichi Kumamoto

A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins.

Prepolymerized catalyst for olefin polymerization, method of producing this prepolymerized catalyst and method of producing olefin polymer

The present invention provides a highly active process for producing an olefin polymer, comprising:

Production process of olefin polymer

There is provided a process for producing a prepolymerization catalyst for polymerization of an olefin, said process comprising the steps of feeding, to a polymerization reactor, an olefin and a solid catalyst component in which a catalyst component for polymerization of the olefin is carried on a fine particle support, and prepolymerizing the olefin in the presence of the solid catalyst component in the polymerization reactor, to thereby obtain the prepolymerization catalyst in which the olefin is prepolymerized on the solid catalyst component, characterized in that said solid catalyst component is pressure-fed to the polymerization reactor from a catalyst feeder connected to the polymerization reactor, and in that the inner pressure of the catalyst feeder at the start of the pressure-feeding is set at (Pr+0.0001) to (Pr+1) (MPa in unit) (in which Pr represents the inner pressure of the polymerization reactor (MPa in unit) at the start of the pressure-feeding).

Process for producing prepolymerization catalyst for polymerization of olefin and process for producing olefin polymer

An ethylene-&#x3b1;-olefin copolymer containing monomer units derived from ethylene and monomer units of an &#x3b1;-olefin having 3 to 20 carbon atoms and having a melt flow rate of from 0.01 to 100 g/10 min, an activation energy of flow of 50 kJ/mol or more, a molecular weight distribution measured by a gel permeation chromatography of 3 or more and minute defects of 2000/mor less in number, a process for producing the copolymer, and a molding of the copolymer.

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Kisarazu, Japan

Tomoaki Goto