Photosensitive composition useful in photoelectrophoretic imaging

Claim 2

A photosensitive composition containing at least about 0.01 weight percent vanadyl phthalocyanine pigment dispersed in an insulating carrier liquid, and in at least partial association with said pigment i. from about 0.01 to about 10 weight percent of a desensitizing dye of the formula ##STR9## wherein X and Z are independently defined as members selected from the group consisting of --NH 2 and --NHR in which R is defined as a phenyl or phenylsulfonate substituent; Y is defined as a phenyl group; and m and n are individually defined as integers of 0- 2, either m or n being defined as at least 1; and ii. about 1 to about 5 weight percent or a mixture of polymeric materials containing from about 20 to about 80 weight percent of at least one polymer having repeating structural units of the formula ##STR10## wherein Z is defined as a group of the formulae ##STR11## in which X is a substituent substantially incapable of withdrawing electrons from the pyridinyl moiety; m 1 is a whole number from 0-3; n 1 is a whole number in excess of 25; and from about 20 to 80 weight percent of at least one polymer having structural units of the formula ##STR12## wherein X is vinyl, alpha-alkyl-substituted vinyl, or alkyl of 1 to 4 carbon atoms; and Y is vinyl, alpha alkyl-substituted vinyl or an alkyl of 1 to 4 carbon atoms, only one of either X or Y being defined as a vinyl or alpha alkyl-substituted vinyl group per structural unit.

Claim 3

The composition of claim 1, wherein the polymeric mixture contains poly(N-vinylcarbazole) and poly(2-vinylpyridine).

Claim 4

The composition of claim 1, wherein the phenazine-like component is defined as an indulin derivative or an acid salt thereof.

Claim 5

The composition of claim 1, wherein the pigment concentration in the dispersion ranges from about .1 to about 10 weight percent.

Claim 6

The composition of claim 1, wherein the insulating carrier liquid is a mineral oil.

Claim 7

The composition of claim 1 wherein the insulating carrier liquid is a saturated aliphatic hydrocarbon or kerosene.

Claim 8

An imaging process comprising: a. providing a photosensitive composition containing at least about 0.01 weight percent vanadyl phthalocyanine pigment dispersed in an insulating carrier liquid, and in at least partial association with said pigment i. from about 0.01 to about 10 weight percent of a compound of the formula ##STR13## wherein X and Z are independently defined as members selected from the group consisting of --NH 2 and --NHR in which R is defined as a phenyl or phenylsulfonate substituent; Y is defined as a phenyl group; and m and n are individually defined as integers of 0-2, either m or n being defined as at least 1, and ii. about 1 to about 5 weight percent or a mixture of polymeric materials containing from about 20 to about 80 weight percent of at least one polymer of the formula ##STR14## wherein Z is a pendant group of the formula ##STR15## in which X is a substituent substantially incapable of withdrawing electrons from the pyridinyl moiety; m 1 is a whole number from 0 to 3; and n 1 is a whole number in excess of 25; and from about 20 to 80 weight percent of at least one polymer having structural units of the formula ##STR16## wherein X is a vinyl, alpha alkyl-substituted vinyl, or alkyl or 1 to 4 carbon atoms, and Y is a vinyl, alpha alkyl substituted vinyl or alkyl of 1 to 4 carbon atoms with the proviso that when only one of either X or Y is vinyl or alpha alkyl substituted vinyl per structural unit; b. confining sid dispersion between a pair of electrodes; c. applying an electric field across said dispersion; and d. subjecting said dispersion to an image pattern of activating electromagnetic radiation concurrent with maintenance of an electric field across said dispersion.

Claim 9

An imaging process comprising: a. providing a photosensitive composition containing at least about 0.01 weight percent vanadyl phthalocyanine pigment dispersed in an insulating carrier liquid, and in at least partial association with said pigment i. from about 0.01 to about 10 weight percent of a compound of the formula ##STR13## wherein X and Z are independently defined as members selected from the group consisting of --NH 2 and --NHR in which R is defined as a phenyl or phenylsulfonate substituent; Y is defined as a phenyl group; and m and n are individually defined as integers of 0-2, either m or n being defined as at least 1, and ii. about 1 to about 5 weight percent or a mixture of polymeric materials containing from about 20 to about 80 weight percent of at least one polymer of the formula ##STR14## wherein Z is a pendant group of the formula ##STR15## in which X is a substituent substantially incapable of withdrawing electrons from the pyridinyl moiety; m 1 is a whole number from 0 to 3; and n 1 is a whole number in excess of 25; and from about 20 to 80 weight percent of at least one polymer having structural units of the formula ##STR16## wherein X is a vinyl, alpha alkyl-substituted vinyl, or alkyl or 1 to 4 carbon atoms, and Y is a vinyl, alpha alkyl substituted vinyl or alkyl of 1 to 4 carbon atoms with the proviso that when only one of either X or Y is vinyl or alpha alkyl substituted vinyl per structural unit; b. confining sid dispersion between a pair of electrodes; c. applying an electric field across said dispersion; and d. subjecting said dispersion to an image pattern of activating electromagnetic radiation concurrent with maintenance of an electric field across said dispersion.