Patent ID: 7410702

Claim:
A two-terminal electric switch comprising a first conductive layer, at least one hole transport polymer and a second conductive layer, wherein at least one hole-transporting polymer comprises a polymeric backbone selected from the group consisting of poly (meth)acrylic acid, poly (meth)acrylates, polyaramides, polyarylenes, polyvinylenes, polyvinyl ethers, polyvinyl esters, polystyrenes, polyesters, and amides, having linked thereto a plurality of substituents comprising fused aromatic ring groups, with the proviso that the polymer does not contain groups selected from triarylamines and carbazole groups wherein the hole-transporting polymer has the formula Pol-R 3 —Ar, where Pol represents the polymeric backbone, Ar represents the fused aromatic ring, and R 3 represents a linkage resulting from the reaction of a first type reactive group and a second type reactive group, and wherein the first type and second type reactive groups are selected from the group consisting of carboxylic acid and amino groups; hydroxyl and acid chloride groups; hydroxyl and carboxylic acid groups; isocyanate and hydroxyl groups; isocyanate and amine groups; epoxy and amine groups; acid chloride and amine groups; sulfonic acid and amine groups; sulfonic acid chloride and hydroxyl groups; aldehyde and amino groups; aldehyde and carboxyl groups; aldehyde and hydroxyl groups; and aldehyde and methylketone groups.