Method for producing high melting-point polyolefins

US6191241A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl-Heinz Aleksander Ostoja Starzewski · Bad Vilbel, DE
• Warren Mark Kelly · Airdrie, CA
• Andreas Stumpf · Leverkusen, DE

Key dates

• Filing date: Dec 30, 1998
• Grant date: Feb 20, 2001
• Expiry date: Dec 30, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/943
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

High-melting polyolefins can be prepared in bulk, in solution, in suspension or in the gas phase, the catalysts employed being metallocene compounds or .pi. complex compounds of the formula ##STR1## in which PA1 CpI and CpII represent carbanions having a cyclopentadienyl-containing structure, PA1 .pi.I and .pi.II represent charged or electrically neutral .pi. systems, PA1 D represents a donor atom and PA1 A represents an acceptor atom, PA2 where D and A are linked by a reversible coordinate bond such that the donor groups assumes a positive (part) charge and the acceptor group assumes a negative (part) charge, PA1 M represents a transition metal of sub-group III, IV, V or VI of the Periodic Table of the Elements (Mendeleev), including the lanthanides and the actinides, PA1 X denotes one anion equivalent and PA1 n denotes the number zero, one, two, three or four, depending on the charge of M.