Electrically activated charge sensitive recording material and process

Claim 2

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least about 1×10 10 ohm-cm and containing at least one electrically activated recording, image-forming combination of (i) a Te(II) coordination complex represented by the formula: YTeY' wherein wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR12## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, said process comprising the steps of: (a) applying an electric potential imagewise to said recording element of a magnitude and for a sufficient time to produce in the image areas a charge density within the range of about 1 microcouloumb per cm 2 to about 1 millicouloumb per cm 2 , said charge density forming a developable latent image in the recording element; and (b) heating said recording element substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 3

A dry, electrically activated recording process as in claim 1 wherein said Te(II) coordination complex is represented by the formula: ##STR13## wherein R 1 and R 2 are individually alkyl containing 1 to 10 carbon atoms or aryl containing 6 to 12 carbon atoms.

Claim 4

A dry, electrically activated recording process as in claim 1 wherein said Te(II) coordination complex is selected from the group consisting of Te(S 2 COC 2 H 5 ) 2 , Te(S 2 CO--i--C 3 H 7 ) 2 , Te(S 2 COC 4 H 9 ) 2 , Te(S 2 COC 10 H 21 ) 2 and Te(S 2 CN(C 2 H 5 ) 2 ) 2 .

Claim 5

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording composite element having an ohmic resistivity of at least about 1×10 10 ohm-cm comprising, in sequence, a support having thereon (a) a first electrical conducting layer, (b) a photoconductor layer, (c) an electrically activated recording layer comprising an image-forming combination of (i) a Te(II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR14## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, and a binder, and (d) a second electrical conducting layer, comprising (A) imagewise altering the conductivity of said photoconductor layer in accord with an image (I) to be recorded, and (B) applying an electric potential across said photoconductive and recording layers of a magnitude and for a sufficient time to produce a developable latent image in said layer corresponding to said image (I); and (C) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 6

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording composite element having an ohmic resistivity of at least about 1×10 10 ohm-cm comprising, in sequence, a support having thereon (a) a first electrical conducting layer, (b) a photoconductor layer, (c) an electrically activated recording layer comprising an image-forming combination of (i) a Te(II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR14## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, and a binder, and (d) a second electrical conducting layer, comprising (A) imagewise altering the conductivity of said photoconductor layer in accord with an image (I) to be recorded, and (B) applying an electric potential across said photoconductive and recording layers of a magnitude and for a sufficient time to produce a developable latent image in said layer corresponding to said image (I); and (C) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 7

A dry, electrically activated recording process as in claim 4 wherein said recording element is heated in (c) to a temperature within the range of about 80° C. to about 200° C. until said latent image is developed.

Claim 8

A dry, electrically activated recording process as in claim 4 wherein said recording element is heated in (c) to a temperature within the range of about 100° C. to about 180° C. until said latent image is developed.

Claim 9

A dry, electrically activated recording process as in claim 4 wherein said Te(II) complex is selected from the group consisting of Te(S 2 COC 2 H 5 ) 2 , Te(S 2 CO--i--C 3 H 7 ) 2 , Te(S 2 COC 4 H 9 ) 2 , Te(S 2 COC 10 H 21 ) 2 and Te(S 2 CN(C 2 H 5 ) 2 ) 2 .

Claim 10

A dry, electrically activated recording process as in claim 4 wherein said electrically activated recording, image-forming combination also comprises a reducible metal salt selected from the group consisting of salts of lead, nickel and copper salts and combinations thereof.

Claim 11

A dry, electrically activated recording process as in claim 4 also comprising a concentration of colloidal silica in said recording layer which produces increased density in a developed image upon imagewise exposure and heating said recording layer.

Claim 12

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least about 1×10 10 ohm-cm and comprising, in sequence, a support having thereon (a) a nickel, electrical conducting layer, (b) an organic photoconductor layer, (c) a non-silver, electrically activated recording layer comprising an image-forming combination of (i) a Te(II) xanthate complex, with (ii) a sulfonamidophenol reducing agent, and a polymeric binder, and (d) a chromium composition, electrical conducting layer, comprising (A) imagewise altering the conductivity of said photoconductor layer in accord with an image (I) to be recorded, and (B) simultaneously applying an electric potential across said photoconductive and recording layers of a magnitude and for a sufficient time to produce a developable latent image in said recording layer corresponding to said image (I), and (C) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said developable latent image.

Claim 13

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least about 1×10 10 ohm-cm and comprising, in sequence, a support having thereon (a) a nickel, electrical conducting layer, (b) an organic photoconductor layer, (c) a non-silver, electrically activated recording layer comprising an image-forming combination of (i) a Te(II) xanthate complex, with (ii) a sulfonamidophenol reducing agent, and a polymeric binder, and (d) a chromium composition, electrical conducting layer, comprising (A) imagewise altering the conductivity of said photoconductor layer in accord with an image (I) to be recorded, and (B) simultaneously applying an electric potential across said photoconductive and recording layers of a magnitude and for a sufficient time to produce a developable latent image in said recording layer corresponding to said image (I), and (C) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said developable latent image.

Claim 14

A dry, electrically activated recording process as in claim 10 wherein said recording element is heated in (c) to a temperature within the range of about 100° C. to about 180° C. for a time within the range of about 1 to about 120 seconds until said latent image is developed.

Claim 15

A dry, electrically activated recording process as in claim 10 also comprising a concentration of colloidal silica in said recording layer which produces increased density in a developed image upon imagewise exposure and heating said recording layer.

Claim 16

A dry, electrically activated recording process for producing a developed tellurium image in an electrically activated recording element comprising, in sequence, the steps of (a) imagewise altering the conductivity of a photoconductive layer (I) in accordance with an image that is to be recorded, (b) positioning the imagewise altered photoconductive layer (I) from (a) adjacent an electrically activated recording layer (II) of said recording element comprising at least one electrically activated recording, image-forming combination of (i) a Te(II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR15## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, and a binder, said recording layer having an ohmic resistivity of at least about 1×10 10 ohm-cm, (c) applying an electric potential across said photoconductive and recording layers of a magnitude and for a sufficient period of time to produce in the areas of said recording layer corresponding to the imagewise altered portions of said photoconductive layer a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 , said charge density forming in said areas a developable latent image; and (d) uniformly heating the recording element at a temperature and for a time sufficient to develop said latent image.

Claim 17

A dry, electrically activated recording process for producing a developed tellurium image in an electrically activated recording element comprising, in sequence, the steps of (a) imagewise altering the conductivity of a photoconductive layer (I) in accordance with an image that is to be recorded, (b) positioning the imagewise altered photoconductive layer (I) from (a) adjacent an electrically activated recording layer (II) of said recording element comprising at least one electrically activated recording, image-forming combination of (i) a Te(II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR15## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, and a binder, said recording layer having an ohmic resistivity of at least about 1×10 10 ohm-cm, (c) applying an electric potential across said photoconductive and recording layers of a magnitude and for a sufficient period of time to produce in the areas of said recording layer corresponding to the imagewise altered portions of said photoconductive layer a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 , said charge density forming in said areas a developable latent image; and (d) uniformly heating the recording element at a temperature and for a time sufficient to develop said latent image.

Claim 18

A dry, electrically activated recording process as in claim 13 also comprising the steps of (e) positioning said imagewise altered photoconductive layer adjacent a second electrically activted recording layer having an ohmic resistivity of at least about 1×10 10 ohm-cm and containing at least one reducible metal salt; (f) applying an electrical potential across said photoconductive and recording layers of a magnitude and for a sufficient time to produce in the areas of said latent image of said photoconductive layer a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 , said charge density forming a developable latent image; and (g) uniformly heating the recording element at a temperature and for a time sufficient to develop said latent image.

Claim 19

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least about 1×10 10 ohm-cm and comprising an electrically activated recording combination comprising (i) a Te(II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR16## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, comprising, in sequence, the steps: (a) positioning said recording element in face-to-face contact with a photoconductive element; (b) exposing said photoconductive element to an imagewise pattern of actinic radiation while simultaneously applying an electrical potential having a field strength of at least about 1×10 5 volts/cm across said photoconductive and recording element for a sufficient time to provide a developable latent image in the areas of said recording element corresponding to the exposed areas of said photoconductive element; and (c) uniformly heating the recording element at a temperature and for a time sufficient to develop said latent image.

Claim 20

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least about 1×10 10 ohm-cm and comprising an electrically activated recording combination comprising (i) a Te(II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR16## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent, comprising, in sequence, the steps: (a) positioning said recording element in face-to-face contact with a photoconductive element; (b) exposing said photoconductive element to an imagewise pattern of actinic radiation while simultaneously applying an electrical potential having a field strength of at least about 1×10 5 volts/cm across said photoconductive and recording element for a sufficient time to provide a developable latent image in the areas of said recording element corresponding to the exposed areas of said photoconductive element; and (c) uniformly heating the recording element at a temperature and for a time sufficient to develop said latent image.

Claim 21

A dry, electrically activated recording process as in claim 15 wherein the impedance of said recording element differs from the impedance of said photoconductive element by no more than about 10 5 ohm-cm when said latent image-forming electrical potential is applied across said photoconductive and recording elements.

Claim 22

A dry, electrically activated recording process as in claim 15 wherein said latent image-forming electric potential provides a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 in the areas of said recording element corresponding to the exposed areas of said photoconductive element.

Claim 23

A dry, electrically activated recording process as in claim 15 wherein said recording element is uniformly heated to a temperature within the range of about 100° C. to about 180° C. until an image is developed.

Claim 24

A dry, electrically activated recording process as in claim 15 wherein said photoconductive element is X-ray sensitive and the conductivity of said element is imagewise altered by exposing said photoconductive element to X-ray radiation in accord with the image to be recorded.

Claim 25

A dry, electrically activated recording process as in claim 15 wherein said Te(II) complex is a Te(II) xanthate and said reducing agent is a sulfonamidophenol.

Claim 26

A dry, electrically activated recording process as in claim 15 also comprising a concentration of colloidal silica in said recording layer which produces increased density in a developed image upon imagewise exposure and heating said layer.

Claim 27

A dry, electrically activated recording process for producing a developed tellurium image in an electrically activated recording material comprising, in sequence, the steps of (a) forming a conductivity pattern on a dielectric material; (b) sequentially positioning said dielectric material containing said conductivity pattern in face-to-face contact with a plurality of charge-sensitive recording materials having an ohmic resistivity of at least 1×10 10 ohm-cm and containing at least one electrically activated recording material comprising (i) a tellurium (II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR17## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent in a binder, and establishing a potential difference across said dielectric and recording materials of a magnitude and for a sufficient time to produce a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 in the area of each recording material corresponding to said conductivity pattern, said charge density being sufficient to form a developable latent image in said recording material; and (c) uniformly heating the said recording materials at a temperature and for a time sufficient to develop said latent image.

Claim 28

A dry, electrically activated recording process for producing a developed tellurium image in an electrically activated recording material comprising, in sequence, the steps of (a) forming a conductivity pattern on a dielectric material; (b) sequentially positioning said dielectric material containing said conductivity pattern in face-to-face contact with a plurality of charge-sensitive recording materials having an ohmic resistivity of at least 1×10 10 ohm-cm and containing at least one electrically activated recording material comprising (i) a tellurium (II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR17## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocarbimate radical, with (ii) a reducing agent in a binder, and establishing a potential difference across said dielectric and recording materials of a magnitude and for a sufficient time to produce a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 in the area of each recording material corresponding to said conductivity pattern, said charge density being sufficient to form a developable latent image in said recording material; and (c) uniformly heating the said recording materials at a temperature and for a time sufficient to develop said latent image.

Claim 29

A dry, electrically activated recording process as in claim 22 wherein said Te(II) complex is Te(II) xanthate and said reducing agent is a sulfonamidophenol.

Claim 30

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least 1×10 10 ohm-cm and containing at least one electrically activated recording material comprising (i) a tellurium (II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR18## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocrbimate radical, with (ii) a reducing agent, and a binder, said process comprising, in sequence, the steps of: (a) positioning said recording element on an electrically conducting backing member; (b) modulating a corona ion current flow to the recording element by an electrostatic field established imagewise between an image grid comprising an electroconductive core sequentially connectable to sources of different potential relative to said backing member and covered with a coating of a photoconductive insulating material and a control grid that is electrically conductive and sequentially connectable to sources of different potential relative to said backing member, said current flow being of a magnitude sufficient to produce a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 imagewise in said recording element, which charge density forms a developable latent image in said electrically activated recording material; and (c) uniformly heating said recording element at a temperature and for a time sufficient to develop said latent image.

Claim 31

A dry, electrically activated recording process for producing a developed tellurium image in a charge-sensitive recording element having an ohmic resistivity of at least 1×10 10 ohm-cm and containing at least one electrically activated recording material comprising (i) a tellurium (II) coordination complex represented by the formula: YTeY' wherein Y and Y' are independently bidentate, sulfur containing, univalent anions represented by the formula: ##STR18## wherein X represents the atoms necessary to complete a dithiocarbamate, xanthate, thioxanthate, dithioacid, dithiophosphinate, difluorodithiophosphinate, dithiophosphate or dithiocrbimate radical, with (ii) a reducing agent, and a binder, said process comprising, in sequence, the steps of: (a) positioning said recording element on an electrically conducting backing member; (b) modulating a corona ion current flow to the recording element by an electrostatic field established imagewise between an image grid comprising an electroconductive core sequentially connectable to sources of different potential relative to said backing member and covered with a coating of a photoconductive insulating material and a control grid that is electrically conductive and sequentially connectable to sources of different potential relative to said backing member, said current flow being of a magnitude sufficient to produce a charge density within the range of about 1 microcouloumb/cm 2 to about 1 millicouloumb/cm 2 imagewise in said recording element, which charge density forms a developable latent image in said electrically activated recording material; and (c) uniformly heating said recording element at a temperature and for a time sufficient to develop said latent image.