Electrically activated recording material and process

Claim 2

A dry electrically activated recording process for producing a developed, silver 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 comprising (i) an organic, silver salt oxidizing agent with (ii) an organic reducing agent, and (iii) a photographic speed-increasing concentration of an organic photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone, and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; said process comprising the steps of (A) imagewise applying an electric potential across said recording layer of a magnitude and for a sufficient time to produce a developable latent image in said layer corresponding to said image (I); and (B) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 3

A process as in claim 1 wherein said recording element is heated in (B) to a temperature within the range of about 80° C. to about 180° C. until said latent image is developed.

Claim 4

A dry electrically activated recording process for producing a developed, silver 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 theron (a) a first electrical conducting layer, (b) a photoconductor layer, (c) an electrically activated recording layer comprising in a binder an image-forming combination of (i) an organic, heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing concentration of an organic photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder, and (d) a second electrical conducting layer; said process comprising the steps of (A) imagewise altering the conductivity of said photoconductor layer in accord with an image (1) to be recorded; (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 (1); and (C) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 5

A dry electrically activated recording process for producing a developed, silver 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 theron (a) a first electrical conducting layer, (b) a photoconductor layer, (c) an electrically activated recording layer comprising in a binder an image-forming combination of (i) an organic, heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing concentration of an organic photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder, and (d) a second electrical conducting layer; said process comprising the steps of (A) imagewise altering the conductivity of said photoconductor layer in accord with an image (1) to be recorded; (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 (1); and (C) heating said recording layer substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 6

A process as in claim 3 wherein said recording element is heated in (C) to a temperature within the range of about 80° C. to about 180° C. until said latent image is developed.

Claim 7

A dry electrically activated recording process for producing a developed, silver image in a charge-sensitive recording element having an ohmic resistivity of at least about 1× 10 ohm-cm and comprising, in sequence, a support having thereon (a) a first electrical conducting layer, (b) a photoconductive layer, (c) an electrically activated recording layer comprising an image-forming combination of (i) a silver behenate oxidizing agent, with (ii) a phenolic reducing agent, and (iii) a photographic speed-increasing concentration of an anthraquinone or substituted anthraquinone electron acceptor, in a synthetic polymeric binder, and (d) a second 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 8

A dry electrically activated recording process for producing a developed, silver image in a charge-sensitive recording element having an ohmic resistivity of at least about 1× 10 ohm-cm and comprising, in sequence, a support having thereon (a) a first electrical conducting layer, (b) a photoconductive layer, (c) an electrically activated recording layer comprising an image-forming combination of (i) a silver behenate oxidizing agent, with (ii) a phenolic reducing agent, and (iii) a photographic speed-increasing concentration of an anthraquinone or substituted anthraquinone electron acceptor, in a synthetic polymeric binder, and (d) a second 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 9

A dry electrically activated recording process as in claim 5 wherein said recording element is heated in (C) to a temperature within the range of about 80° C. to about 180° C.

Claim 10

A dry electrically activated recording process for producing a developed heavy metal image in an electrically activated recording element comprising, in sequence, the steps of (a) imagewise altering the conuctivity of a photoconductive layer (I) in accord 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) an organic heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; said recording layer having an ohmic resistivity of at least about 1× 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 0.1 microcoulomb/cm 2 to about 1 millicoulomb/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 11

A dry electrically activated recording process for producing a developed heavy metal image in an electrically activated recording element comprising, in sequence, the steps of (a) imagewise altering the conuctivity of a photoconductive layer (I) in accord 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) an organic heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; said recording layer having an ohmic resistivity of at least about 1× 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 0.1 microcoulomb/cm 2 to about 1 millicoulomb/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 12

A dry electrically activated recording process as in claim 7 wherein said oxidizing agent consists essentially of a silver behenate oxidizing agent, said reducing agent consists essentially of a compound selected from the group consisting of 3-pyrazolidone, phenolic, reductone, and sulfonamidophenol reducing agents, and said speed-increasing electron acceptor consists essentially of anthraquinone.

Claim 13

A dry electrically activated recording process for producing a developed, heavy metal 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) an organic heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; comprising, in sequence, the steps of: (a) positioning said recording element in face-to-face contact with a photoconductive element; (b) imagewise exposing said photoconductive element to 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 composite for a sufficient time to provide a developable latent image in the areas of said recording element corresponding to the imagewise 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 14

A dry electrically activated recording process for producing a developed, heavy metal 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) an organic heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing electron acceptor which is a compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; comprising, in sequence, the steps of: (a) positioning said recording element in face-to-face contact with a photoconductive element; (b) imagewise exposing said photoconductive element to 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 composite for a sufficient time to provide a developable latent image in the areas of said recording element corresponding to the imagewise 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 15

A dry electrically activated recording process as in claim 9 wherein said oxidizing agent consists essentially of a silver behenate oxidizing agent, said reducing agent consists essentially of a compound selected from the group consisting of 3-pyrazolidone, phenolic, reductone, and sulfonamidophenol reducing agents, and said speed-increasing electron acceptor consists essentially of anthraquinone.

Claim 16

A process as in claim 9 wherein the impedance of said recording element differs from the impedance of said photoconductive element by no more than 10 5 ohm-cm when said latent image-forming electrical potential is applied across said photoconductive and recording elements.

Claim 17

A process as in claim 9 wherein said photoconductive element is X-ray sensitive and the conductivity of said element is imagewise altered by imagewise exposing said photoconductive element to X-ray radiation in accord with the image to be recorded.

Claim 18

A process as in claim 9 wherein said oxidizing agent is an organotellurim (II) compound.

Claim 19

A process as in claim 9 wherein said oxidizing agent is a tellurium (II) xanthate.

Claim 20

A dry, non-silver, electrically activated recording process for producing a developed, heavy metal 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 comprising (i) a non-silver, organic heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing concentration of an organic photographic speed-increasing electron acceptor which is compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; 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 0.1 microcoulomb per cm 2 to about 1 millicoulomb per cm 2 , said charge density forming a developable latent image in the recording element; and (b) heating said exposed recording element substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 21

A dry, non-silver, electrically activated recording process for producing a developed, heavy metal 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 comprising (i) a non-silver, organic heavy metal salt oxidizing agent, with (ii) an organic reducing agent, and (iii) a photographic speed-increasing concentration of an organic photographic speed-increasing electron acceptor which is compound selected from the group consisting of (I) anthraquinone and substituted anthraquinone electron acceptors, (II) phthalaldehyde, (III) tetrachlorophthalonitrile, (IV) tetrachlorophthalic anhydride, (V) p-chloranil, (VI) α,α,α,α',α',α'-hexachloro-p-xylene, (VII) cobaltihexamine trifluoroacetate, and combinations thereof, and a binder; 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 0.1 microcoulomb per cm 2 to about 1 millicoulomb per cm 2 , said charge density forming a developable latent image in the recording element; and (b) heating said exposed recording element substantially uniformly at a temperature and for a time sufficient to develop said latent image.

Claim 22

A dry, non-silver, electrically activated recording process as in claim 15 wherein said oxidizing agent is an organometallic compound selected from the group consisting of organotellurium (II) compounds and organocopper compounds.