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US 2011/0256475 A1Published application
Imaging members having a novel slippery overcoat layer
AssigneeXerox Corporation
InventorRobert C. U. Yu
Life of this patent
Estimating the term…
Abstract
The presently disclosed embodiments relate in general to electrophotographic imaging members which include a protective overcoat layer comprising specific low surface energy polycarbonates of excellent optical clarity and having a slippery and adhesive surface to impact toner image transfer efficiency to receiving papers and effect contact friction reduction by which imaging members abrasion/wear resistance is enhanced. The present embodiments also disclose a process for making and using these members.
Claims22
An 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 low surface energy polycarbonate being an A-B di-block copolymer comprising two segmental blocks, the first segment block (A) being
- wherein x polydimethyl siloxane (PDMS) repeat units is from about 10 to about 40 and y is from about 1 to about 15, and the second segment block (B) being selected from the group consisting of
- wherein z is from about 50 to about 400.
4 more elements
An 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 polymer blend of a low surface energy polycarbonate being an A-B di-block copolymer comprising two segmental blocks, the first segment block (A) being
- wherein x is from about 10 to about 40 and y is from about 1 to about 15, and the second segment block (B) being selected from the group consisting of
- wherein z is from about 50 to about 400, and a bisphenol polycarbonate being selected from the group consisting of a bisphenol A polycarbonate of poly(4,4′-isopropylidene diphenyl carbonate) having a weight average molecular weight of from about 20,000 to about 130,000 and a molecular structure:
- wherein n indicates the degree of polymerization and is from about 79 to about 512 and a bisphenol Z polycarbonate of poly(4,4′-diphenyl-1,1′-cyclohexane carbonate) having a weight average molecular weight is from about 20,000 to about 200,000 and a molecular structure:
- wherein n indicates the degree of polymerization and is from about 68 to about 680.
6 more elements
An image forming apparatus for forming images on a recording medium comprising:
- a) an imaging member having a charge retentive-surface for receiving an electrostatic latent image thereon, wherein the flexible imaging member comprises
- 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 low surface energy polycarbonate being an A-B di-block copolymer comprising two segmental blocks, the first segment block (A) being
- wherein x is from about 10 to about 40 and y is from about 1 to about 15, and the second segment block (B) being selected from the group consisting of
- wherein z is from about 50 to about 400;
- 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.
8 more elements
Dependencies are inferred from the claim text.