Patent ID: 7875411

Claim:
A photoreceptor comprising a substrate; a charge generating layer; a charge transport layer comprising N,N,N′,N′-tetra(4-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine having a purity of from about 95 percent to about 100 percent; and a protective overcoating layer comprising a hole transport material other than N,N,N′,N′-tetra(4-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine; wherein the photoreceptor will discharge from about 85% to about 100% of its surface potential in from 0 to about 40 milliseconds upon being subjected to xerographic charging and exposure to radiant energy of from about 1 erg/cm 2 to about 5 ergs/cm 2 .