Process for the preparation of polythiophenes by use of ferric salts and alkyl halides
AssigneeSolvay & Cie
InventorsClaude Franquinet, Etienne Hannecart, Elise Destryker
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Abstract
A process for the preparation of a polymer which is electrically conductive and which is based on polythiophene, the process including polymerizing thiophene in a reaction medium including thiophene, from 2.5 to 20 moles of an anhydrous ferric salt per mole of thiophene, from 0.04 to 1 liter of an alkyl halide per gram of thiophene, and from 0.1 to 5% by weight of water introduced into the reaction medium based on the amount of alkyl halide.
Claims8
A process for the preparation of a polymer which is electrically conductive and which is based on polythiophene, the process comprising:
- polymerizing thiophene in a reaction medium comprised of:
- thiophene,
- from 2.5 to 20 moles of an anhydrous ferric salt per mole of thiophene,
- from 0.04 to 1 liter of an alkyl halide per gram of thiophene, and
- from 0.1 to 5% by weight of water introduced into the reaction medium based on the amount of alkyl halide.
A chemical polymerization process for the preparation of a doped polythiophene which is electrically conductive, the process comprising:
- a. introducing into a reactor kept at a temperature ranging from 0.degree. to 25.degree. C. and a pressure ranging from 0.1 to 10 bars, a fraction of an alkyl halide containing from 1 to 10 carbon atoms and a ferric salt, with stirring;
- b. adding to the reactor, after step a and in parallel, water and thiophene dissolved in a remaining fraction of the alkyl halide, and stirring for a time effective to polymerize the thiophene;
- and
- c. recovering polythiophene by filtration, washing the polythiophene with a suitable solvent, and drying the polythiophene,
- wherein from 0.04 to 1 liter of alkyl halide per gram of thiophene, from 2.5 to 20 moles of ferric salt per mole of thiophene, and from 0.01 to 5% by weight of water based on the weight of alkyl halide are employed.
Dependencies are inferred from the claim text.