Patent ID: 6939652

Claim:
A flexible electrostatographic imaging member comprising: a substrate support having a first and a second major surface, wherein said substrate support comprises a flexible biaxially oriented thermoplastic polyester having a thickness of between about 50 and about 150 micrometers and having a thermal contraction coefficient of between about 1×10 −5 /° C. and about 3×10 −5 /° C.; a multilayered photoimaging layer on the first major surface of the substrate support; and an optically transparent anti-curl back coating on the second major surface of the substrate support, said anti-curl back coating comprising a film forming thermoplastic polymer and having a glass transition temperature (Tg) value of at least about 75° C., a thermal contraction coefficient value of at least about 1.5 times greater than the thermal contraction coefficient value of the substrate support, and a 180° peel strength value of at least about 15 grams/centimeter (g/cm), wherein said anti-curl back coating comprises either of the following: (a) a thermoplastic polymer comprising a polyphthalate carbonate resin having a thermal contraction coefficient of about 7.1×10 −5 /° C., a Tg value of about 170° C., and a molecular formula of: wherein x is an integer between about 1 and about 10, and n is the degree of copolymerization; (b) a thermoplastic polymer comprising a polycarbonate resin having a thermal contraction coefficient of between about 6.0×10 −5 /° C. and about 7.0×10 −5 /° C. and a Tg value of between about 145 and about 165° C., wherein said polycarbonate resin is a polycarbonate of poly(4,4-diphenyl-1,1′-cyclohexane carbonate); (c) a polyether sulfone thermoplastic polymer having a thermal contraction coefficient of about 6.0×10 −5 /° C. and a Tg value of about 220° C.; (d) a thermoplastic polystyrene having a thermal contraction coefficient of about 6.5×10 −5 /° C. and a Tg value of about 100° C.; (e) a styrene acrylonitrile thermoplastic copolymer having a thermal contraction coefficient of about 6.8×10 −5 /° C. and a Tg value of about 120° C.; (f) a thermoplastic polymer comprising from about 90 to about 99 percent by weight of styrene acrylonitrile thermoplastic copolymer and about 1 to about 10 percent by weight of a copolyester of poly(1,4-cyclohexylene-dimethylene terephthalate); or (g) a film forming thermoplastic polymer selected from the group consisting of polysulfone, polyarylate, and polyphenylene sulfone having a thermal contraction coefficient of between about 5.0×10 −5 /° C. and about 8.0×10 −5 /° C., and a Tg value of about between about 140 and about 220° C.