Dye sensitized titanium dioxide electrophotographic photosensitive materials

Claim 1

An electrophotographic photosensitive material comprising an electroconductive substrate having positioned thereon a photosensitive layer comprising as main components titanium dioxide and a binding materials, characterized in that said photosensitive layer contains at least one cyanine dye represented by the general formula (I) ##STR88## wherein Y is a hydrogen atom, a halogen atom or an alkyl group; n is an integer of 1 to 3; Z 1 is ##STR89## in which R is a carboxyalkyl group, a sulfoalkyl group or a salt or anion thereof, a hydroxyalkyl group, or an alkyl group; A is a hydrogen atom; a halogen atom, a hydroxyl group; an alkyl group, an alkoxy group, an alkoxycarbonyl group, a carboxyl group or a salt or anion thereof, a phenyl group, or an atomic group forming an aromatic hydrocarbon six-membered ring in conjunction with the carbon atoms in the 4- and 5-positions, the 5- and 6-positions or the 6- and 7-positions of the ring; provided that when the R groups in both Z 1 and Z 2 are alkyl groups, the A groups in at least one of Z 1 and Z 2 are carboxyl groups or salt or anions thereof; and X.sup.⊖ is the acid anion residue which exists only where the nitrogen atom in the ring is a cation center and neither R nor A forms an anion, the amount of cyanine dye being 0.001 to 0.3% by weight based on the weight of titanium dioxide.