Patent · US Expired

Method for polymerizing conjugated diolefins (dienes) with catalysts based on vanadium compounds in the presence of vinylaromatic solvents

US6566465B1 · kind B1 · utility

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7References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Heike Windisch · Leverkusen, DE
Werner Obrecht · Moers, DE
Gisbert Michels · Leverkusen, DE
Norbert Steinhauser · Monheim, DE

Key dates

Filing date	Jan 11, 2001
Grant date	May 20, 2003
Priority date	—
Expiry date	Jan 11, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F36/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on monocyclopentadienyl compounds of vanadium and alumoxanes in the presence of aromatic vinyl compounds as the solvent at temperatures of −30 C. to +80 C. By means of the process according to the invention, it is possible to straightforwardly produce solutions of polydiolefins, such as polybutadiene, having 1,2 unit contents of 10 to 30% in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.