Imaging members having a chemical resistive overcoat layer
AssigneeXerox Corporation
InventorsRobert C. U. Yu, Yuhua Tong
Life of this patent
Estimating the term…
Abstract
The presently disclosed embodiments are directed to imaging members used in electrostatography. More particularly, the embodiments pertain to electrophotographic imaging members which have an added-on protective overcoat layer formulated to comprise of a novel A-B diblock copolymer comprising two segmental blocks of a bisphenol polycarbonate and an organic acid terminal which provides chemical vapor contaminant resistive property. The overcoat layer may further be formulated to include small quantity of charge transport compound. The present embodiments provide superior copy printout quality.
Claims18
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 film forming and optically clear A-B diblock copolymer capable of providing protection against amine species contaminants, wherein the diblock copolymer has a formula selected from the group consisting of
- wherein z representing the number of bisphenol A repeating units in block A is from about 9 to about 18, y representing the number of repeating phthalic acid in block B is from about 1 to about 2, and n representing the degree of polymerization of diblock copolymer is from about 20 to about 80;
- and
- wherein z representing the number of bisphenol A repeating units in block (A) is from about 9 to about 18, y representing the number of repeating phthalic acid in block (B) is from about 1 to about 2, and n representing the degree of polymerization of diblock copolymer is from about 20 to about 80;
- and mixtures thereof.
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 film forming and optically clear A-B diblock copolymer comprising two segmental blocks of a bisphenol A polycarbonate (C16H14O3) and a phthalic acid, wherein block A comprises bisphenol A, block A having about 9 to about 18 repeating units, and block B comprises phthalic acid, block B having about 1 to about 2 repeating units.
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 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 film forming and optically clear A-B diblock copolymer capable of providing protection against amine species contaminants, wherein the diblock copolymer has a formula selected from the group consisting of
- wherein z representing the number of bisphenol A repeating units in block A is from about 9 to about 18, y representing the number of repeating phthalic acid in block B is from about 1 to about 2, and n representing the degree of polymerization of diblock copolymer is from about 20 to about 80;
- and
- wherein z representing the number of bisphenol A repeating units in block (A) is from about 9 to about 18, y representing the number of repeating phthalic acid in block (B) is from about 1 to about 2, and n representing the degree of polymerization of diblock copolymer is from about 20 to about 80;
- and mixtures thereof;
- 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.
Dependencies are inferred from the claim text.