Patent ID: 7338621
Filing Date: 2008-03-04
Classification: C08G,C08J,C08L,C09D,G03G

Abstract:
1. A coating composition capable of yielding layers with an enhanced transparency at a given surface resistance comprising 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 an 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, the composition being prepared by a method comprising: (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) at a temperature of 80° C. or below until the content of water therein is reduced by at least 65% by weight.