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:
Nov. 05, 2002
Filed:
Jun. 29, 1999
Jan F. Van Baar, Uitgeest, NL;
Maurizio Galimberti, Milan, IT;
Klaas L. Von Hebel, Kortenhoef, NL;
Andrew D. Horton, Amsterdam, NL;
Gerard M. M. Van Kessel, Geldermalsen, NL;
Peter A. Schut, Almere, NL;
Tiziano Dall'occo, Ferrara, IT;
Basell Technology Company BV, Hoofddorp, NL;
Abstract
Catalysts for the polymerization of olefins are disclosed, comprising the product obtainable by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of Ti, Zr or Hf; (B) one or more organometallic aluminium compounds of formula (II): AlR H wherein the substituents R , same or different from each other, are linear or branched, saturated or unsaturated C -C alkyl or alkylaryl radicals, optionally containing Si or Ge atoms, wherein at least one of the substituents R is different from a straight alkyl group; z is 0 or 1; and (C) water, the molar ratio between the organometallic aluminium compound and water being comprised between 1:1 and 100:1; said catalyst being obtainable by a process comprising the following steps: (i) contacting component (A) with part of component (B) in the absence of component (C); (ii) contacting part of component (B) with component (C) in the absence of component (A) and successively (iii) contacting the products obtained in steps (i) and (ii).