Electrically conductive composition and elements containing solubilized polyaniline complex and solvent mixture
First Claim
1. An electrically conductive coating composition comprising a solution of:
- a) a complex of a polymeric polyaniline and a protonic acid that has a counter-ion that imparts conductivity to said composition,said complex being dissolved in a first solvent, that has a Hansen polar solubility parameter of from 13 to about 17 MPa1/2, and a Hansen hydrogen bonding solubility parameter of from about 5 to about 14 MPa1/2, andb) a film-forming binder dissolved in a second solvent, wherein said first and second solvents are different,provided that the total solids in said composition is less than or equal to about 10 weight % of the total composition, and the weight ratio of said binder to said complex is at least about 2;
1,wherein said first solvent is dimethylsoulfoxide, a γ
-butyrolactone/lower alcohol blend, a propylene carbonate/lower alcohol blend, an ethylene carbonate/lower alcohol blend, a propylene carbonate/ethylene carbonate/lower alcohol blend, or a mixture thereof, wherein said lower alcohol has up to 4 carbon atoms,said second solvent is water, a chlorinated solvent, or a mixture of a chlorinated solvent with a lower alcohol or acetone, wherein said lower alcohol has up to 4 carbon atoms,the weight ratio of said second solvent to said first solvent is from about 5;
1 to about 19;
1, andsaid composition provides a dried conductive layer having a resistivity of less than or equal to 10.9 log ohms/square.
0 Assignments
0 Petitions
Accused Products
Abstract
Electrically conductive elements, such as imaging elements, can be prepared by applying electrically conductive coating compositions to a suitable support. The coating compositions include a polyaniline-protonic counter-ion complex in a first solvent that has certain Hansen solubility parameters, and a film-forming binder in a second common coating solvent. The total solids in the coating composition is less than or equal to about 10 weight %, and the weight ratio of the binder to the complex is at least about 1:1. Under these formulation conditions, the polyaniline protonic counter-ion complex is solubilized, rather than being in dispersed form, and is readily applied to form a thin, relatively transparent, electrically conductive film. Antistatic layers of photographic elements can be prepared in this manner.
183 Citations
15 Claims
-
1. An electrically conductive coating composition comprising a solution of:
-
a) a complex of a polymeric polyaniline and a protonic acid that has a counter-ion that imparts conductivity to said composition, said complex being dissolved in a first solvent, that has a Hansen polar solubility parameter of from 13 to about 17 MPa1/2, and a Hansen hydrogen bonding solubility parameter of from about 5 to about 14 MPa1/2, and b) a film-forming binder dissolved in a second solvent, wherein said first and second solvents are different, provided that the total solids in said composition is less than or equal to about 10 weight % of the total composition, and the weight ratio of said binder to said complex is at least about 2;
1,wherein said first solvent is dimethylsoulfoxide, a γ
-butyrolactone/lower alcohol blend, a propylene carbonate/lower alcohol blend, an ethylene carbonate/lower alcohol blend, a propylene carbonate/ethylene carbonate/lower alcohol blend, or a mixture thereof, wherein said lower alcohol has up to 4 carbon atoms,said second solvent is water, a chlorinated solvent, or a mixture of a chlorinated solvent with a lower alcohol or acetone, wherein said lower alcohol has up to 4 carbon atoms, the weight ratio of said second solvent to said first solvent is from about 5;
1 to about 19;
1, andsaid composition provides a dried conductive layer having a resistivity of less than or equal to 10.9 log ohms/square. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification