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US 8,021,812 B2Granted
Low friction electrostatographic imaging member
AssigneeXerox Corporation
InventorRobert C. U. Yu
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 slippery polyhedral oligomeric silsequioxane molecules 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;
- an overcoat layer disposed on the at least one charge transport layer;
- and
- an anticurl back coating positioned on a second side of the substrate opposite to the charge generating layer and the at least one charge transport layer, wherein the overcoat layer and the anticurl back coating includes an adhesion promoter, a bisphenol type polycarbonate having a weight average molecular weight of between 20,000 and 200,000 and being selected from the group consisting of a bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl) carbonate having the following formula (A):
- wherein n indicates each respective degree of polymerization, a modified bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl) carbonate having the following formula (B):
- wherein m indicates each respective degree of polymerization, a bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate having the following formula (C):
- wherein n indicates each respective degree of polymerization, a modified bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate having the following formula (D):
- wherein p indicates each respective degree of polymerization, a phthalate-bisphenol A polycarbonate having the following formula (E):
- wherein w is an integer from about 1 to about 20 and n is the degree of polymerization, and mixtures thereof, an ultra high weight average molecular weight bisphenol type polycarbonate of formulas (A) to (E), which is greater than 200,000, and a slip agent.
8 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;
- an overcoat layer disposed on the at least one charge transport layer;
- and
- an anticurl back coating positioned on a second side of the substrate opposite to the charge generating and the at least one charge transport layer, wherein the anticurl back coating includes an adhesion promoter, a bisphenol type polycarbonate having a weight average molecular weight of between 20,000 and 200,000 and is being selected from the group consisting of a bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl) carbonate having the following formula (A):
- wherein n indicates each respective degree of polymerization, a modified bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl) carbonate having the following formula (B):
- wherein m indicates each respective degree of polymerization, a bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate having the following formula (C):
- wherein n indicates each respective degree of polymerization, a modified bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate having the following formula (D):
- wherein p indicates each respective degree of polymerization, a phthalate-bisphenol A polycarbonate having the following formula (E):
- wherein w is an integer from about 1 to about 20 and n is the degree of polymerization, and mixtures thereof, an ultra high weight average molecular weight bisphenol type polycarbonate of formulas (A) to (E) of greater than 200,000, and a slip agent, and further wherein the overcoat layer and the anticurl back coating each include a polysiloxane containing slippery polyhedral oligomeric silsequioxane or polytetrafluoroetheylene containing slippery polyhedral oligomeric silsequioxane and an ozone suppression agent in the layer.
8 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;
- an overcoat layer disposed on the at least one charge transport layer;
- and
- an anticurl back coating positioned on a second side of the substrate opposite to the charge generating and the at least one charge transport layer, wherein the overcoat layer and the anticurl back coating each includes a polysiloxane or polytetrafluoroethylene slippery polyhedral oligomeric silsequioxane, an ozone suppression agent, and a slip agent in a bisphenol type polycarbonate, the bisphenol type polycarbonate having a weight average molecular weight of between 20,000 and 200,000 and is being selected from the group consisting of a bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl) carbonate having the following formula (A):
- wherein n indicates each respective degree of polymerization, a modified bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl) carbonate having the following formula (B):
- wherein m indicates each respective degree of polymerization, a bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate having the following formula (C):
- wherein n indicates each respective degree of polymerization, a modified bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane) carbonate having the following formula (D):
- wherein p indicates each respective degree of polymerization, a phthalate-bisphenol A polycarbonate having the following formula (E):
- wherein w is an integer from about 1 to about 20 and n is the degree of polymerization, and mixtures thereof, and wherein the anticurl back coating contains an adhesion promoter and has a thickness of from about 5 microns to about 80 microns, and the overcoat layer includes an ultra weight average high molecular weight of the bisphenol type polycarbonate exceeding 200,000, a charge transport compound not exceeding 10 weight percent of the total weight of the overcoat layer, and has as a thickness of from about 1 to about 10 micrometers;
- wherein the anticurl back coating is a dual layer comprising an inner layer and an outer exposed layer and both layers include the bisphenol type polycarbonate, and further wherein the inner layer includes an adhesion promoter and the outer exposed layer includes a polysiloxane containing slippery polyhedral oligomeric silsequioxane or polytetrafluoroethylene containing slippery polyhedral oligomeric silsequioxane, an ozone suppression agent, and a slip agent.
9 more elements
Dependencies are inferred from the claim text.