Patent · US Expired

Continuous process for producing elastomers

US6521720B2 · kind B2 · utility

6Cited by

9References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Thomas Knauf · Dormagen, DE
Josef-Werner Naunheim · Dormagen, DE
Klaus Wiemann · Lillebonne, FR

Key dates

Filing date	Feb 1, 2002
Grant date	Feb 18, 2003
Priority date	—
Expiry date	Feb 1, 2022

Classification

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

Abstract

The present invention relates to a continuous process for producing elastomers based on conjugated dienes or based on conjugated dienes and vinyl aromatic compounds or based on alkenes, polymerization being carried out while maintaining certain residence times of the monomers used and the elastomers obtained in the reactors while maintaining a certain temperature gradient in the first reactor. The elastomers obtained by the process according to the invention are characterized in particular by a low metal ion content, a low ash content and a high cis-1,4 compound content in the polymer. Furthermore, the process according to the present invention is particularly economical.

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