Method for producing elastomers

US6172169A · 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: Jan 9, 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

Elastomers can be prepared by (co)polymerization of monomers consisting of the group of C.sub.2 -C.sub.8 -.alpha.-olefins, C.sub.4 -C.sub.15 -diolefins and other monomers in the bulk, solution, slurry or gas phase, the catalysts employed being metallocene compounds or the .pi. complex compounds of the formula ##STR1## in which CpI and CpII represent carbanions having a cyclopentadienyl-containing structure, .pi.I and .pi.II represent charged or electrically neutral .pi. systems, D represents a donor atom and A represents an acceptor atom, where D and A are linked by a reversible coordinate bond such that the donor group assumes a positive (part) charge and the acceptor group assumes a negative (part) charge, 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, X denotes one anion equivalent and n denotes the number zero, one, two, three or four, depending on the charge of M.