Process for the preparation of neutral polyethylenedioxythiophene, and corresponding polyethylenedioxythiophenes

US6756473B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Knud Reuter · Krefeld, DE
• Stephan Kirchmeyer · Leverkusen, DE

Key dates

• Filing date: Dec 18, 2002
• Grant date: Jun 29, 2004
• Expiry date: Dec 18, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G61/126
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the preparation of neutral poly(ethylene-3,4-dioxythiophenes) of the general formula (I) in whichR1 and R2, independently of one another, each represent H or C1 to C9-alkyl, it also being possible for R2 to be CH2—O—R3 with R3=H or C1 to C9-alkyl, cycloalkyl or aralkyl, when R1 represents H, and n represents 2 to 200, suitable thiophene monomers being reacted in an organic solvent with an oxidizing agent and the oxidizing agent being used in 50 to 99.9% of the stoichiometrically required amount. The neutral poly(ethylene-3,4-dioxythiophenes) thus obtainable are distinguished in particular by their solubility in organic solvents.