.pi.-Deficient N-heteroaromatic chemical sensitizers for heterogeneous organic photoconductor compositions and methods
AssigneeEastman Kodak Company
InventorWilliam E. Yoerger
Life of this patent
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Abstract
Photoconductive insulating compositions in the form of organic photoconductive dispersions are described. Particles of organic photoconductor such as p-terphenyl are dispersed in cellulose nitrate and chemically sensitized with .pi.-deficient N-heteroaromatic compounds such as quinoxalines to provide useful heterogeneous photoconductive insulating dispersions. Such dispersions can be applied to an electrically conducting support to prepare electrophotographic elements.
Claims21
An electrophotographic element comprising an electrically conducting support bearing thereon a layer of a heterogeneous photoconductive insulating composition comprising particles of an organic photoconductor compound selected from the group consisting of (a) fused carbocylic ring compounds, (b) polyphenyl compounds having the structure ##STR4## wherein n is an integer from 1 to 6;
- and (c) nitrogen-free, polyarylated compounds having the structure ##STR5## wherein n is 0, 1, or 2 Ar is aryl;
- and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 individually represent hydrogen, Ar, alkyl having 1 to about 10 carbon atoms, or alkoxy having 1 to about 10 carbon atoms, with the proviso that when n is 0, both R.sup.1 and R.sup.4 are Ar, and when both R.sup.1 and R.sup.4 are hydrogen, both R.sup.2 and R.sup.3 are Ar,
- said photoconductor particles being dispersed in cellulose nitrate and chemically sensitized with a .pi.-deficient N-heteroaromatic compound.
A heterogeneous photoconductive insulating composition comprising particles of an organic photoconductor compound selected from the group consisting of (a) fused carbocyclic ring compounds, (b) polyphenyl compounds having the structure ##STR6## wherein n is an integer from 1 to 6;
- and (c) nitrogen-free, polyarylated compounds having the structure ##STR7## wherein n is 0, 1, or 2 Ar is aryl;
- and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 individually represent hydrogen Ar, alkyl having 1 to about 10 carbon atoms, or alkoxy having 1 to about 10 carbon atoms, with the proviso that when n is 0, both R.sup.1 and R.sup.4 are Ar, and when both R.sup.1 and R.sup.4 are hydrogen, both R.sup.2 and R.sup.3 are Ar,
- said photoconductor particles being dispersed in cellulose nitrate and chemically sensitized with a .pi.-deficient N-heteroaromatic compound.
A heterogeneous photoconductive insulating composition comprising particles of an organic photoconductor compound selected from the group consisting of (a) fused carbocyclic ring compounds, (b) polyphenyl compounds having the structure ##STR8## wherein n is an integer from 1 to 6;
- and (c) nitrogen-free, polyarylated compounds having the structure ##STR9## wherein n is 0, 1, or 2 Ar is aryl;
- and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 individually represent hydrogen, Ar, alkyl having 1 to about 10 carbon atoms, or alkoxy having 1 to about 10 carbon atoms, with the proviso that when n is 0, both R.sup.1 and R.sup.4 are Ar, and when both R.sup.1 and R.sup.4 are hydrogen, both R.sup.2 and R.sup.3 are Ar,
- said photoconductor particles being dispersed in cellulose nitrate and chemically sensitized with a sensitizing compound which is a pyridine, a pyrimidine, a quinoline, a pyridazine, a pyrazine, a phenazine, or a quinoxaline.
A heterogeneous photoconductive insulating composition comprising particles of anthracene, p-terphenyl, p-quaterphenyl, or a tetraphenylbutadiene, dispersed in cellulose nitrate and chemically sensitized with a quinoxaline compound.
A heterogeneous photoconductive insulating composition comprising particles of an organic photoconductor compound selected from the group consisting of (a) fused carbocyclic ring compounds, (b) polyphenyl compounds having the structure ##STR10## wherein n is an integer from 1 to 6;
- and (c) nitrogen-free, polyarylated compounds having the structure ##STR11## wherein n is 0, 1, or 2 Ar is aryl;
- and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 individually represent hydrogen, Ar, alkyl having 1 to about 10 carbon atoms, or alkoxy having 1 to about 10 carbon atoms, with the proviso that when n is 0, both R.sup.1 and R.sup.4 are Ar, and when both R.sup.1 and R.sup.4 are hydrogen, both R.sup.2 and R.sup.3 are Ar,
- said photoconductor particles being dispersed in cellulose nitrate and chemically sensitized with a .pi.-deficient N-heteroaromatic compound substituted with at least one styryl group.
An electrophotographic element comprising an electrically conducting paper support bearing thereon a layer of a heterogeneous photoconductive insulating composition comprising particles of an organic photoconductor which is anthracene or p-terphenyl dispersed in cellulose nitrate and chemically sensitized with a quinoxaline compound.
Dependencies are inferred from the claim text.