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:
Apr. 10, 2001
Filed:
Jun. 03, 1998
Olefin polymerization catalyst and process for preparing polypropylene and propylene block copolymer
Tetsunori Shinozaki, Waki-cho, JP;
Mamoru Kioka, Waki-cho, JP;
Mitsui Chemicals, Tokyo, JP;
Abstract
The present invention provides olefin polymerization catalysts and processes for preparing a polypropylene and a propylene block copolymer using the olefin polymerization catalysts. The olefin polymerization catalyst (1) of the invention is formed from: (I-1) a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (C) a specific organosilicon compound; (II-1) (D) a specific polyether compound; and optionally, (III) an organometallic compound catalyst component. The olefin polymerization catalyst (2) of the invention is formed from: (I-2) a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (D) a specific polyether compound; (II-2) (C) a specific organosilicon compound; and optionally, (III) an organometallic compound catalyst component. The propylene is polymerized in the presence of the above-mentioned olefin polymerization catalysts to prepare highly isotactic polypropylene. The propylene block copolymer is prepared by the steps of polymerizing propylene to form a polypropylene component and copolymerizing ethylene and an &agr;-olefin of 3 to 20 carbon atoms to form an ethylene/&agr;-olefin copolymer component in the presence of the polymerization catalysts.