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:
May. 06, 2003
Filed:
Jun. 29, 1999
Andrew D. Horton, Amsterdam, NL;
Jan F. van Baar, Uitgeest, NL;
Peter A. Schut, Almere, NL;
Gerard M. M. van Kessel, Geldermalsen, NL;
Klaas L. von Hebel, Kortenhoef, NL;
Basell Technology Company BV, Hoofddorp, NL;
Abstract
Catalysts for the polymerization of olefins are disclosed, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or hafnium; (B) an organometallic aluminium compound of the formula: Al(CH —CR R —CR R R ) R H wherein R is a C -C alkyl, alkenyl, or arylalkyl group; R is hydrogen or a C -C alkyl, alkenyl, or arylalkyl group; R and R are C -C alkyl, alkenyl, aryl, arylalkyl or alkylaryl groups; R is hydrogen or a C -C alkyl, alkenyl, aryl, arylalkyl or alkylaryl group; R is a C -C alkyl, alkenyl, or arylalkyl group, a carbon atom in the compound of formula (II) being optionally replaced by a Si or Ge atom; w is 1-3, z is 0 or 1, q=3−w−z, and (C) water; the molar ratio (B)/(C) being comprised between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.