Patent ID: 6866977

Claim:
A photoconductive element comprising an electrically conductive support, an electrical barrier layer disposed over said electrically conductive support, and disposed over ad barrier layer, a charge generation layer capable of generating positive charge carriers when exposed to actinic radiation, said barrier layer comprising a polyamide-co-imide polymer that includes an aromatic tetracarbonylbisimide group, and which polymer corresponds to the formula: wherein: Q represents one or more groups selected from: (a) an alkylenedioxy, alkylenedicarbonyl, aromatic dicarboxyl, aromatic dicarbonyl, and aromatic diamino groups having from about 2 to about 36 carbon atoms; and where: Ar 3 , Ar 4 , and Ar 7 independently represent a tetravalent aromatic group having from about 6 to about 20 carbon atoms; Ar 5 and Ar 6 independently represent a trivalent aromatic group having from about 6 to about 12 carbon atoms; R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 independently represent alkylene or alkyleneoxy groups having from about 2 to about 12 carbon atoms; L 1 , L 2 , L 3 , L 4 , L 5 , and L 6 independently represent CO or NH; Z 1 and Z 2 independently represent an alkylenediacid, alkylenediamino, or alkyleneoxydiamino group having from about 2 to about 36 carbon atoms; X is O, C(CF 3 ) 2 , S═O or SO 2 ; and x and y represent mole fractions, x being the mole fraction of the group that contains Ar 3 and y being the mole fraction of the group, Z 1 ; and wherein x is from about 0.05 to 1 and y is from 0 to about 0.95.