Patent ID: 7618757

Claim:
An imaging member comprising a substrate, a charge generation layer, a first charge transport layer, a second charge transport layer, and an optional overcoat layer; in which the first charge transport layer is formed from a first CTL formulation comprising an aromatic monoamine and a first polymeric film forming binder material; and in which the second charge transport layer is formed from a second CTL formulation comprising an aromatic diamine and a second polymeric film forming binder material; and wherein the first polymeric film forming binder material or the second polymeric film forming binder material further comprises a tetrapolymer represented by the following formula: wherein Ru is an alkylene group; and, based on the total weight of the reactants for the tetrapolymer, U1 is the vinyl chloride proportion that is from about 80 percent to about 90 percent, U2 is the vinyl acetate proportion that is from about 3 percent to and about 15 percent, U3 is the hydroxyalkyl acrylate proportion that is from about 6 percent to about 20 percent, and U4 is the maleic acid proportion that is from about 0.1 percent to about 0.5 percent.