Crystalline organic pigment sensitizers for photoconductive layers

Claim 2

A photoconductive composition comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising crystallized organic pigments having the formula: ##STR24## wherein n is 1 or 2; X consists of the atoms necessary to complete a naphthalene, anthracene, or ##STR25## R 1 ,R 2 , and R 3 are independently selected from the group consisting of hydrogen, halogen, alkoxy, NO 2 , alkyl, SO 3 H or alkali metal salts thereof, and COOH or alkali metal salts thereof; and wherein R 2 and R 3 can comprise the atoms necessary to complete a phenyl, naphthyl or anthryl ring; and R is selected from the group consisting of ##STR26## or COOM wherein M is alkyl or an alkali or alkaline earth metal.

Claim 3

The photoconductive composition of claim 1 wherein the photoconductor is dispersed in an electrically insulating polymeric binder.

Claim 4

A photoconductive composition comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising crystallized organic pigments having the formula ##STR27##

Claim 5

A photoconductive composition comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising crystallized organic pigments having the formula ##STR27##

Claim 6

The photoconductive composition of claim 1 wherein the pigment is crystallized by extracting the pigment in 1,1,2-trichloroethane.

Claim 7

The photoconductive composition of claim 3 wherein the pigment is crystallized by extracting the pigment in 1,1,2-trichloroethane.

Claim 8

The photoconductive composition of claim 1 wherein the photoconductor is an organic photoconductor.

Claim 9

The photoconductive composition of claim 6 wherein the organic photoconductor is selected from the group consisting of arylamines, arylalkanes, organometallics and polymeric photoconductors.

Claim 10

The photoconductive composition of claim 1 wherein the photoconductor is an inorganic photoconductor.

Claim 11

The photoconductive composition of claim 8 wherein the inorganic photoconductor is selected from the group consisting of selenium, zinc oxide, titanium oxide, cadmium sulfide, cadmium selenide and lead oxide.

Claim 12

The photoconductive composition of claim 3 wherein the photoconductor is an organic photoconductor.

Claim 13

The photoconductive composition of claim 10 wherein the organic photoconductor is selected from the group consisting of arylamines, arylalkanes, organometallics and polymeric photoconductors.

Claim 14

The photoconductive composition of claim 3 wherein the photoconductor is an inorganic photoconductor.

Claim 15

The photoconductive composition of claim 12 wherein the inorganic photoconductor is selected from the group consisting of selenium, zinc oxide, titanium oxide, cadmium sulfide, cadmium selenide and lead oxide.

Claim 16

An electrophotographic element comprising a conductive support having coated thereon a photoconductive composition comprising a sensitizing amount of sensitizer for the photoconductor comprising a crystallized organic pigment having the formula ##STR28## wherein n is 1 or 2; X consists of the atoms necessary to complete a naphthalene, anthracene, or ##STR29## R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen, halogen, alkoxy, NO 2 , alkyl, SO 3 H or alkali metal salts thereof, and COOH or alkali metal salts thereof; and wherein R 2 and R 3 can comprise the atoms necessary to complete a phenyl, naphthyl or anthryl ring; and R is selected from the group consisting of ##STR30## or COOM wherein M is alkyl or an alkali or alkaline earth metal.

Claim 17

An electrophotographic element comprising a conductive support having coated thereon a photoconductive composition comprising a sensitizing amount of sensitizer for the photoconductor comprising a crystallized organic pigment having the formula ##STR28## wherein n is 1 or 2; X consists of the atoms necessary to complete a naphthalene, anthracene, or ##STR29## R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen, halogen, alkoxy, NO 2 , alkyl, SO 3 H or alkali metal salts thereof, and COOH or alkali metal salts thereof; and wherein R 2 and R 3 can comprise the atoms necessary to complete a phenyl, naphthyl or anthryl ring; and R is selected from the group consisting of ##STR30## or COOM wherein M is alkyl or an alkali or alkaline earth metal.

Claim 18

The electrophotographic element of claim 14 wherein the photoconductor is dispersed in an electrically insulating polymeric binder.

Claim 19

An electrophotographic element comprising a conductive support having coated thereon a photoconductive composition comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising a crystallized organic pigment having the formula ##STR31##

Claim 20

An electrophotographic element comprising a conductive support having coated thereon a photoconductive composition comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising a crystallized organic pigment having the formula ##STR31##

Claim 21

The electrophotographic element of claim 14 wherein the photoconductor is an inorganic photoconductor.

Claim 22

The electrophotographic element of claim 17 wherein the organic photoconductor is selected from the class consisting of arylamines, arylalkanes, organometallics and polymeric photoconductors.

Claim 23

The electrophotographic element of claim 14 wherein the photoconductor is an inorganic photoconductor.

Claim 24

The electrophotographic element of claim 19 wherein the inorganic photoconductor is selected from the class consisting of selenium, zinc oxide, titanium oxide, cadmium sulfide, cadmium selenide and lead oxide.

Claim 25

The electrophotographic element of claim 16 wherein the photoconductor is an organic photoconductor.

Claim 26

The electrophotographic element of claim 21 wherein the organic photoconductor is selected from the class consisting of arylamines, arylalkanes, organometallics and polymeric photoconductors.

Claim 27

The electrophotographic element of claim 16 wherein the photoconductor is an inorganic photoconductor.

Claim 28

The electrophotographic element of claim 23 wherein the inorganic photoconductor is selected from the class consisting of selenium, zinc oxide, titanium oxide, cadmium sulfide, cadmium selenide and lead oxide.

Claim 29

In an electrophotographic process wherein an electrostatic charge pattern is formed on an electrophotographic element the improvement characterized in that said electrophotographic element has a photoconductive layer comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising a crystallized organic pigment having the formula ##STR32## wherein n is 1 or 2; X consists of the atoms necessary to complete a naphthalene, anthracene, or ##STR33## R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen, halogen, alkoxy, NO 2 , alkyl, SO 3 H or alkali metal salts thereof, and COOH or alkali metal salts thereof; and wherein R 2 and R 3 can comprise the atoms necessary to complete a phenyl, naphthyl or anthryl ring; and R is selected from the group consisting of ##STR34## or COOM wherein M is alkyl or an alkali or alkaline earth metal.

Claim 30

In an electrophotographic process wherein an electrostatic charge pattern is formed on an electrophotographic element the improvement characterized in that said electrophotographic element has a photoconductive layer comprising a photoconductor and a sensitizing amount of a sensitizer for the photoconductor comprising a crystallized organic pigment having the formula ##STR32## wherein n is 1 or 2; X consists of the atoms necessary to complete a naphthalene, anthracene, or ##STR33## R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen, halogen, alkoxy, NO 2 , alkyl, SO 3 H or alkali metal salts thereof, and COOH or alkali metal salts thereof; and wherein R 2 and R 3 can comprise the atoms necessary to complete a phenyl, naphthyl or anthryl ring; and R is selected from the group consisting of ##STR34## or COOM wherein M is alkyl or an alkali or alkaline earth metal.

Claim 31

The electrophotographic process of claim 23 wherein the photoconductor is dispersed in an electrically insulating polymeric binder.

Claim 32

In an electrophotographic process wherein an electrostatic charge pattern is formed on an electrophotographic element the improvement characterized in that said electrophotographic element has a photoconductor layer comprising a sensitizing amount of a sensitizer for the photoconductor comprising a crystallized organic pigment having the formula: ##STR35##

Claim 33

In an electrophotographic process wherein an electrostatic charge pattern is formed on an electrophotographic element the improvement characterized in that said electrophotographic element has a photoconductor layer comprising a sensitizing amount of a sensitizer for the photoconductor comprising a crystallized organic pigment having the formula: ##STR35##