Method for producing cycloolefin (CO) polymers for use in optical data memories

US6232413A · 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
• Claudia Schmid · Leichlingen, DE

Key dates

• Filing date: Dec 30, 1998
• Grant date: May 15, 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

Cycloolefin copolymers for use for optical data memories, can be prepared by copolymerization of monomers from the group consisting of cyclic olefins, .alpha.-olefins having 2 or more C atoms and optionally conjugated or non-conjugated diolefins, 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, PA1 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, PA1 M represents a transition metal of sub-group III, IV, V or VI of the Periodic Table of elements (Mendeleev), including the lanthanides and the actinides, PA1 X denotes an anion equivalent and PA1 n denotes the number zero, one, two, three or four, depending on the charge of M.