Composition containing a polymer or copolymer of a 3,4-dialkoxythiophene and non-aqueous solvent
US7338621B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2005 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | May 17, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L65/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for preparing a composition containing between 0.08 and 3.0% by weight of a polymer or copolymer of a 3,4-dialkoxythiophene in which said two alkoxy groups may be the same or different or together represent a oxy-alkylene-oxy bridge optionally substituted with substituents selected from the group consisting of alkyl, alkoxy, alkyoxyalkyl, carboxy, alkylsulphonato, alkyloxyalkylsulphonato and carboxy ester groups, a polyanion and at least one polyhydroxy non-aqueous solvent from a dispersion of said polymer or copolymer of (3,4-dialkoxythiophene) and said polyanion in water comprising in the following order the steps of: i) mixing at least one of said non-aqueous solvents with said aqueous dispersion of said polymer or copolymer of (3,4-dialkoxythiophene) and said polyanion; and ii) evaporating water from the mixture prepared in step i) until the content of water therein is reduced by at least 65% by weight; a printing ink, printing paste or coating composition, capable of yielding layers with an enhanced transparency at a given surface resistance, prepared according to the above-described method; a coating process with the coating composition thereby producing a layer with…
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