Patent ID: 8465892
Filing Date: 2013-06-18
Classification: G03G

Abstract:
1. A flexible imaging member comprising: a flexible 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 over the at least one charge transport layer, wherein the overcoat layer comprises a blend of a polycarbonate and a low surface energy polycarbonate, and further wherein the polycarbonate is an A-B diblock copolymer comprising a bisphenol A polycarbonate segment block (A) and a phthalic acid containing segment block (B) terminal capable of providing protection against amine species contaminants, selected from the group consisting of Formula (I) and Formula (II) below: wherein z represents the number of bisphenol A repeating units in block A of from about 9 to about 18, y is number of repeating phthalic acid block B of from about 1 to about 2, and n is the degree of polymerization between about 20 and about 80 for the copolymer having a weight average molecular weight between about 100,000 and about 200,000, and mixtures thereof, while the low surface energy polycarbonate is selected from the group consisting of a bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl carbonate) modified by including a small fraction of polydimethyl siloxane (PDMS) linkages in the main polycarbonate chain back bone to obtain Formula (1) below: wherein x is a number from about 10 to about 50, and f and g are numbers representing each respective repeating segment such that f is from about 1 to about 4 and g is from about 10 to about 100 for a weight average molecular weight of from about 15,000 to about 130,000 of the low surface energy polycarbonate, a bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane carbonate) modified by including a small fraction of polydimethyl siloxane (PDMS) linkages into the main polycarbonate chain back bone to obtain Formula (2) below: wherein x is a number from about 10 and about 50 while f and g are numbers representing each respective repeating units such that f is between about 1 and about 4 and g is from about 10 to about 100 for a weight average molecular weight of from about 15,000 to about 130,000 of the low surface energy polycarbonate, a bisphenol C polycarbonate of poly(4,4′-isopropylidene diphenyl carbonate) modified by including a small fraction of polydimethyl siloxane (PDMS) linkages into the main polycarbonate chain back bone to obtain Formula (3) below: wherein x is a number from about 10 and about 50 while f and g are numbers representing the respective repeating units such that f is between about 1 and about 4 and g is from about 10 to about 100 for a weight average molecular weight of from about 15,000 to about 130,000 of the low surface energy polycarbonate, and a bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane carbonate) modified by including a small fraction of polydimethyl siloxane (PDMS) linkages into the main polycarbonate chain back bone to obtain Formula (4) below: wherein x is a number from about 10 and about 50 while f and g are numbers representing the respective repeating units such that f is between about 1 and about 4 and g is from about 10 to about 100 for a weight average molecular weight of from about 15,000 to about 130,000 of the low surface energy polycarbonate, and mixtures thereof, and an anticurl back coating layer disposed on the flexible substrate on a side opposite the charge generating and charge transport layers.