Patent ID: 8263301
Filing Date: 2012-09-11
Classification: G03G

Abstract:
1. An electrophotographic imaging member comprising: a substrate; a charge generating layer disposed on the substrate; at least one charge transport layer disposed on the charge generating layer; and an overcoat layer disposed on the charge transport layer, wherein the overcoat layer comprises a blend consisting of a low surface energy modified polycarbonate polymer having a molecular weight of between about 20,000 and about 200,000, the polymer being formed and selected from the group consisting of a modified Bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl carbonate) of formula (I) below: wherein x is an integer between about 40 and about 50 while y and z are integers representing a number of the respective repeating units, a modified Bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane carbonate) formula (II) below: wherein x is an integer between about 40 and about 50 while y and z are integers representing a number of the respective repeating units, a modified Bisphenol C polycarbonate derived from the modification of poly(4,4′-isopropylidene diphenyl carbonate) of formula (III) below: wherein x is an integer between about 40 and about 50 while y and z are integers representing a number of the respective repeating units, a modified Bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane carbonate) of formula (IV) below: wherein x is an integer between about 40 and about 50 while y and z are integers representing a number of the respective repeating units, and mixtures thereof, and an ultra high molecular weight of at least 200,000 bisphenol type polycarbonate of (1) the bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl)carbonate, as given in formula (A) below: and an extended structure of the bisphenol A polycarbonate is given in below formula (B): where n and m in formulas (A) and (B) indicate the respective degree of polymerization; (2) the bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate, as given in formula (C) below: and an extended structure of the bisphenol Z polycarbonate is given in formula (D) as follows: where n and p indicate each respective degree of polymerization; and (3) the phthalate-bisphenol A polycarbonate as represented by the structural formula (E) below: wherein w is an integer from about 1 to about 20, and n is the degree of polymerization; and an anticurl back coating positioned on a second side of the substrate opposite to the charge generating and the charge transport layers.