Process for making organic photosensitive pigment
AssigneeXerox Corporation
InventorsGeorge Liebermann, Marko Saban, Sandra Gardner, Cuong Vong
Life of this patent
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Abstract
Processes for making photosensitive organic pigments for use in imaging members, specifically processes for making a photosensitive phthalocyanine pigments having a specific crystal form, comprising dissolving the pigment in a mixture of a haloacetic acid and alkylene halide to form a solution, precipitating the pigment by adding the solution to a non-solvent system, the solution comprised of one or more organic solvents and a small amount of water, wherein the amount of water controls the crystal form of the pigment, followed by a treatment with a halobenzene to obtain a highly photosensitive second crystal form of the pigment.
Claims17
A process for preparing a phthalocyanine pigment having a specific crystal form, wherein the improvement comprises:
- (a) dissolving a pigment in a solvent mixture of a haloacetic acid and alkylene halide to form a solution;
- (b) precipitating the pigment to a crystal form by adding the solution to a non-solvent mixture, the non-solvent mixture comprising one or more organic solvents and a small amount of water;
- (c) using the presence of water to control the resulting crystal form of the pigment.
A process for preparing a photosensitive phthalocyanine pigment having a specific crystal form, wherein the improvement comprises:
- (a) dissolving a pigment in a solvent mixture of a haloacetic acid and alkylene halide to form a solution;
- (b) precipitating the pigment to a crystal form by adding the solution to a non-solvent mixture, the non-solvent mixture comprising one or more organic solvents and a small amount of water:
- (c) using the amount of water to control the resulting crystal form of the pigment;
- and
- (d) converting the pigment to a second crystal form by treatment with a halobenzene, wherein the second crystal form is highly photosensitive.
Dependencies are inferred from the claim text.