ELECTROSTATIC COATINGS AND ARTICLES COMPRISING POLYTHIOPHENES
Electrostatic dissipation coatings based on regioregular polythiophenes including blends and block copolymers. The compositions can be soluble in organic solvents. Excellent film formation, transparency, stability, and conductivity control can be achieved.
1 . An article comprising:
at least one substrate,
at least one electrostatic dissipation coating on the substrate, wherein the coating comprises at least one polymer blend comprising at least one polymer comprising regioregular polythiophene and at least one polymer which does not comprise regioregular polythiophene, wherein the coating transparency is at least 80% for a coating thickness of 38 nm.
2 . The article according to claim 1 , wherein the polymer comprising regioregular polythiophene is a homopolymer.
3 . The article according to claim 1 , wherein the polymer comprising regioregular polythiophene is a copolymer.
4 . The article according to claim 1 , wherein the polymer comprising regioregular polythiophene is a block copolymer, and one segment of the block comprises regioregular polythiophene.
5 . The article according to claim 1 , wherein the regioregular polythiophene has a degree of regioregularity of at least 85%.
6 . The article according to claim 1 , wherein the regioregular polythiophene has a degree of regioregularity of at least 95%.
7 . The article according to claim 1 , wherein the amount of the regioregular polythiophene is less than about 30 wt. %.
8 . The article according to claim 1 , wherein the blend is a compatible blend.
9 . The article according to claim 1 , wherein the polymer which does not comprise regioregular polythiophene is a synthetic polymer.
10 . The article according to claim 1 , wherein the at least one polymer comprising regioregular polythiophene and at least one polymer which does not comprise regioregular polythiophene are each soluble in organic solvent.
11 . The article according to claim 1 , wherein the at least one polymer comprising regioregular polythiophene is doped sufficiently to provide an electronic conductivity of at least about 10 −10 siemens/cm.
12 . The article according to claim 1 , wherein the electronic conductivity of the coating is about 10 −13 siemens/cm to about 10 −3 siemens/cm.
13 . The article according to claim 1 , wherein the substrate is an insulative substrate.
14 . The article according to claim 1 , wherein the substrate comprises glass, silica, or a polymer.
15 . The article according to claim 1 , wherein the regioregular polythiophene is doped with an organic dopant and is substituted with a heteroatom.
16 . The article according to claim 1 , wherein the regioregular polythiophene is doped with a quinone compound and the coating has a thickness of about 10 nm to about 100 nm, and wherein the polymer which does not comprise regioregular polythiophene comprises a polystyrene, a polystyrene derivative, a polyurethane, a polyacrylate, a polypyridine, or a polyvinyl phenol.
17 . The article according to claim 1 , wherein the transparency is at least 90% over the wavelength region of 300 nm to 800 nm.
18 . An article comprising:
at least one substrate,
at least one electrostatic dissipation coating on the substrate having a coating thickness of about 100 nm or less, wherein the coating comprises (1) at least one polymer blend comprising at least one polymer comprising an organic solvent soluble regioregular polythiophene which is doped, and (2) at least one organic solvent soluble polymer which does not comprise regioregular polythiophene, wherein the coating transparency is at least 80% for a coating thickness of 38 nm.
19 . The article according to claim 18 , wherein the coating transparency is at least 90% over the wavelength range of 300 nm to 800 nm.
20 . An article comprising:
at least one substrate,
at least one electrostatic dissipation coating on the substrate, wherein the coating comprises at least one polymer comprising regioregular polythiophene and the coating, wherein the coating transparency is at least 80% for a coating thickness of 38 nm.
21 . The article according to claim 20 , wherein the polymer is a block copolymer.