Compositions – Electrically conductive or emissive compositions
Reexamination Certificate
2006-10-17
2006-10-17
Kopec, Mark (Department: 1751)
Compositions
Electrically conductive or emissive compositions
Reexamination Certificate
active
07122130
ABSTRACT:
A method for preparing a composition containing between 0.08 and 3.0% by weight of polymer or copolymer of a 3,4-dialkoxythiophene in which the two alkoxy groups may be the same or different or together represent an optionally substituted oxy-alkylene-oxy bridge, a polyanion and at least one non-aqueous solvent from a dispersion of the polymer or copolymer of (3,4-dialkoxythiophene) and the polyanion in water which is prepared in the substantial absence of oxygen, comprising in the following order the steps of: i) mixing at least one of the non-aqueous solvents with the aqueous dispersion of the polymer or copolymer of (3,4-dialkoxythiophene) and the 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 enhanced conductivity at a given transparency, prepared according to the above-described method; a coating process with the coating composition thereby producing a layer with enhanced conductivity at a given transparency; and a printing process with the printing ink or paste thereby producing a layer with enhanced conductivity at a given transparency.
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Groenendaal Bert
Louwet Frank
Tahon Jean-Piere
Van den Bogaert Roger
Agfa Gevaert
Kopec Mark
Leydig Voit & Mayer Ltd
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