Back to results
US 8,263,301 B2Granted
Low friction electrostatographic imaging member
AssigneeXerox Corporation
InventorsRobert C. U. Yu, Stephen T. Avery, Kathleen M. Carmichael
Life of this patent
Estimating the term…
Abstract
Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
Claims20
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.
15 more elements
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 charge transport compound, a polyhedral oligomeric silsequioxane, an ozone suppression agent, a slip agent, and 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.
15 more elements
An image forming apparatus for forming images on a recording medium comprising:
- a) 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;
- b) a development component for applying a developer material to the charge-retentive surface to develop the electrostatic latent image to form a developed image on the charge-retentive surface;
- c) a transfer component for transferring the developed image from the charge-retentive surface to a copy substrate;
- and
- d) a fusing component for fusing the developed image to the copy substrate.
18 more elements
Dependencies are inferred from the claim text.