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:
Feb. 03, 2009
Filed:
Jul. 29, 2004
Kazuhiro Yamamoto, Kanagawa, JP;
Kiyoshi Yukawa, Mie, JP;
Yasuhiro Kashiwagi, Kanagawa, JP;
Yoichi Maeda, Mie, JP;
Kazuhiro Yamamoto, Kanagawa, JP;
Kiyoshi Yukawa, Mie, JP;
Yasuhiro Kashiwagi, Kanagawa, JP;
Yoichi Maeda, Mie, JP;
Japan Polypropylene Corporation, Tokyo, JP;
Abstract
A large-scale and efficient industrialization of olefin polymerization by metallocene catalysts is realized by, in olefin polymerization by metallocene-based catalysts, increasing catalytic activity and polymerization efficiency to sufficiently bring out the performances of the metallocene catalysts and maintain a stable polymerization reaction. The amount of a halogen-containing compound is controlled so that the gram-atomic amount ratio to a transition metal of a halogen atom in a halogen-containing compound in solvents and materials other than a halogen atom in a catalyst component is 0.8 or less, in manufacturing plants of commercial level in an olefin polymerization by a metallocene catalyst.