Patent ID: 7112368

Claim:
A poly(dioxythiophene)/poly(acrylamidoalkylsulfonic acid) complex having a particle size less than 1 micron, wherein: (I) the poly(dioxythiophene) comprises a repeating unit having Formula III where R 1 and R 2 are independently selected from H or a C 1 –C 6 alkyl or together form an optionally substituted C 1 –C 6 alkylene radical, and the poly(acrylamidoalkylsulfonic acid) comprises a repeating unit having Formula II where R 3 and R 4 are independently selected from H, a C 1 –C 6 alkyl or phenyl, R 5 is a single bond or a C 1 –C 6 alkylene, and R 6 is a C 1 –C 12 alkylene; and (ii) said complex is formed by the oxidative polymerization of a dioxythiophene monomer having Formula I where R 1 and R 2 are independently selected from H or a C 1 –C 6 alkyl or together form an optionally substituted C 1 –C 6 alkylene radical, in water in the presence of the poly(acrylamidoalkylsulfonic acid).