Patent ID: 7828994

Claim:
A conductive paint composition, comprising a solvent, metal powders and a water-dispersible polyurethane resin having the following formula: wherein: R 1 represents an aliphatic hydrocarbon having from 4 to 12 carbon atoms, a cyclic aliphatic hydrocarbon having from 6 to 15 carbon atoms or a mixture thereof; R 2 represents an aliphatic hydrocarbon having from 2 to 12 carbon atoms; R 3 represents an aliphatic hydrocarbon having from 2 to 20 carbon atoms or an aromatic hydrocarbon having from 6 to 20 carbon atoms; R 4 and R 5 independently represent a hydrogen atom or a methyl group; R 6 represents an aliphatic hydrocarbon having from 3 to 4 carbon atoms; R 7 represents a hydrogen atom or an aliphatic hydrocarbon having from 1 to 9 carbon atoms; R 8 represents an aliphatic hydrocarbon having from 1 to 10 carbon atoms, a cyclic aliphatic hydrocarbon having from 3 to 10 carbon atoms or a mixture thereof; wherein the ratio of n1:(n2+n4+n6):n3:n4 is (0.2 to 1.5):(1.0 to 3.0):(0.01 to 0.3):(0.1 to 1.0); wherein n5 is from 0.1 to 1.0; wherein x is from 1 to 20; wherein a sum of y and z is from 2 to 200; and wherein the polyurethane resin contains a repeating unit in which R 3 is an aromatic hydrocarbon and a repeating unit in which R 3 is an aliphatic hydrocarbon; wherein the metal powders comprises a first metal powder having an average particle size in a range of 1 to 5 microns and a second metal powder having a particle size in a range of 4 to 10 microns, wherein the average particle size of the second metal powder is greater than the average particle size of the first metal powder, and wherein the weight percent ratio of the second metal powder to the first metal powder is greater than 4:1.