The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 2009
Filed:
Jan. 29, 2008
Hisakatsu Hama, Ichihara, JP;
Hidetake Hozumi, Ichihara, JP;
Hisakatsu Hama, Ichihara, JP;
Hidetake Hozumi, Ichihara, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
The object of the present invention is to provide a process for producing an ethylene-α-olefin-polyene copolymer by continuous multistage polymerization which can give an ethylene-α-olefin-polyene copolymer excellent in a form retention property during extrusion. The process for producing an ethylene-α-olefin-polyene copolymer comprises continuously polymerizing ethylene, α-olefin, and the following polyene (A) and polyene (B) in a solvent in the presence of an olefin polymerization catalyst using a polymerization reaction apparatus comprising two tanks of polymerization reactors connected in series, wherein the polymerization is carried out under specific conditions: