Electronically-conductive polymers
AssigneeThe Dow Chemical Company
InventorsSusan J. Babinec, Ashish Sen, Ray E. Drumright
Life of this patent
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Abstract
A doped intrinsically-conductive polymer having a conductivity of at least about 10−12 Siemens/cm (S/cm); which is doped with at least two different dopants, including a “short-chain dopant” having a molecular weight of less than 1,000 and a “long-chain dopant” which is polymeric and has a weight average molecular weight of greater than 2,000.
Claims9
A conductive polymer composition having a conductivity of at least about 10−12 Siemens/cm (S/cm) and comprising an intrinsically-conductive polymer which is doped with at least two different dopants, including a first dopant having a molecular weight of less than about 1,000 and a second dopant which is polymeric and has a weight average molecular weight of greater than about 2,000, wherein the first dopant is dodecylbenzenesulfonic acid, para-toluenesulfonic acid or hydroxybenzenesulfonic acid, and wherein the first dopant is present in an amount sufficient to increase the conductivity of the composition, relative to the conductivity of a composition, which is the same in all respects, except that the intrinsically-conductive polymer has the same molar amount of available sites doped solely with the second dopant.
A compatible mixture of:
- (a) at least one matrix material selected from thermoplastic polymers, thermosetting polymers, latexes, and sol gels and (b) a doped intrinsily-conductive polymer having a higher electronic conductivity than (a), wherein:
- (i) the doped intrinsically-conductive polymer is doped with at least two different dopants, including a first dopant having a molecular weight of less than 1,000 and being selected from dedecylbenzenesulfonic acid and para-toluenesulfonic acid, and a second dopant which is polymeric and has a weight average molecular weight of greater than 2,000;
- (ii) at least 1 percent of the polymer's available sites are doped with each dopant;
- and
- (iii) the composition has a conductivity of at least about 10−12 Siemens/cm (S/cm).
An aqueous dispersions of a doped intrinsically conductive polymer which is doped with at least two dopants, including a first dopant selected from dodecylbenzenesulfonic acid and para-toluenesulfonic acid, and a second dopant having a higher molecular weight than the first dopant, wherein (a) at least 1 percent of the polymer's available sites are doped with each dopant;
- and (b) the doped polymer has a conductivity of at least about 10-12 Siemens/cm (S/cm).
Dependencies are inferred from the claim text.