US 7,321,021 B2
Removing impurities from polythiophene
Alan Edward John Toth, Burlington (Canada); and Tamara Perez-Cruz, Mississauga (Canada)
Assigned to Xerox Corporation, Norwalk, Conn. (US)
Filed on Mar. 22, 2005, as Appl. No. 11/85,215.
Prior Publication US 2006/0217524 A1, Sep. 28, 2006
Int. Cl. C08G 75/00 (2006.01)
U.S. Cl. 528—378  [528/373; 528/491; 528/499; 528/502 R] 20 Claims
 
1. A method for removing impurities from polythiophene, comprising:
(a) mixing a composition comprising the polythiophene, water and an organic liquid at a temperature at which the organic liquid dissolves the polythiophene;
(b) in the composition formed in (a), allowing an aqueous phase to separate from an organic phase and recovering organic phase;
(c) adding water to recovered organic phase and mixing the resulting composition at a temperature at which the organic liquid dissolves the polythiophene;
(d) in the composition formed in (c), allowing an aqueous phase to separate from an organic phase and recovering organic phase; and
(e) allowing polythiophene solid to precipitate from recovered organic phase.