US5238764A
Expired / Lapsed
US
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Electrophotographic elements containing a titanyl fluorophthalocyanine pigment
Assignee: Eastman Kodak Co
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Filing: 1992-02-13
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Granted: 1993-08-24
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Expires: 2012-02-13
Abstract
Abstract The invention provides an electrophotographic element comprising an electrically conductive substrate and a photoconductive layer, wherein the photoconductive layer has been formed from a coating solution of a polymeric binder and an organic solvent having a gammac hydrogen bonding parameter value greater than 9.0, the coating solution having dispersed therein a titanyl fluorophthalocyanine pigment which has been acid-pasted or salt-milled to increase its photosensitivity and then has been brought into contact with an organic solvent having a gammac hydrogen bonding parameter value less than 8.0 to preserve its increased photosensitivity, prior to the pigment's being dispersed in the coating solution.
Inventors
- 👤 Michel F. Molaire
- 👤 Robert J. Patti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:51
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0696; G03G5/05; G03G5/0525
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
An electrophotographic element comprising an electrically conductive substrate and a photoconductive layer, wherein the photoconductive layer has been formed from a coating solution of a polymeric binder and an organic solvent having a gamma c hydrogen bonding parameter value greater than 9.0, the coating solution having dispersed therein a titanyl fluorophthalocyanine pigment which has been acid-pasted or salt-milled to increase its photosensitivity and then has been brought into contact with an organic solvent having a gamma c hydrogen bonding parameter value less than 8.0 to preserve its increased photosensitivity, prior to the pigment's being dispersed in the coating solution.
Claim 2
Dependent Claim
99 words
An electrophotographic element comprising an electrically conductive substrate and a photoconductive layer, wherein the photoconductive layer has been formed from a coating solution of a polymeric binder and an organic solvent having a gamma c hydrogen bonding parameter value greater than 9.0, the coating solution having dispersed therein a titanyl fluorophthalocyanine pigment which has been acid-pasted or salt-milled to increase its photosensitivity and then has been brought into contact with an organic solvent having a gamma c hydrogen bonding parameter value less than 8.0 to preserve its increased photosensitivity, prior to the pigment's being dispersed in the coating solution.
Claim 3
Dependent Claim
48 words
The electrophotographic element of claim 1, wherein the titanyl fluorophthalocyanine pigment has the structure ##STR2## wherein each of k, m, n, and q is independently an integer from 0 to 4, and at least one of k, m, n, and q is an integer from 1 to 4.
Claim 4
Dependent Claim
16 words
The electrophotographic element of claim 2, wherein each of k, m, n, and q is 1.
Claim 5
Dependent Claim
32 words
The electrophotographic element of claim 1, wherein the organic solvent having a gamma c hydrogen bonding parameter value less than 8.0 has a gamma c hydrogen bonding parameter value less than 7.0.
Claim 6
Dependent Claim
28 words
The electrophotographic element of claim 1, wherein the organic solvent having a gamma c hydrogen bonding parameter value less than 8.0 comprises dichloromethane, 1,1,2-trichloroethane, or methyl ethyl ketone.
Claim 7
Dependent Claim
40 words
The electrophotographic element of claim 1, wherein the contact with an organic solvent having a gamma c hydrogen bonding parameter value less than 8.0 comprises milling the pigment in such solvent for 3 days without external application of heat thereto.
Claim 8
Dependent Claim
23 words
The electrophotographic element of claim 1, wherein the organic solvent having a gamma c hydrogen bonding parameter value greater than 9.0 comprises tetrahydrofuran.
Claim 9
Dependent Claim
24 words
The electrophotographic element of claim 1, wherein the photoconductive layer is a charge generation layer, and the element further comprises a charge transport layer.
Claim 10
Dependent Claim
85 words
An electrophotographic element comprising an electrically conductive substrate and a photoconductive layer, wherein the photoconductive layer has been formed from a coating solution of a polymeric binder and an organic solvent having a gamma c hydrogen bonding parameter value greater than 9.0, the coating solution having dispersed therein a titanyl fluorophthalocyanine pigment which exhibits major x-ray diffractogram peaks, obtained with CuK alpha radiation, at Bragg angles (2θ±0.2) of 6.6, 7.1, 9.8, 11.6, 12.9, 14.9, 15.8, 18.2, 20.7, 23.2, 24.3, 27.0, 31.0, 32.5, 34.5, and 37.1.
Claim 11
Dependent Claim
85 words
An electrophotographic element comprising an electrically conductive substrate and a photoconductive layer, wherein the photoconductive layer has been formed from a coating solution of a polymeric binder and an organic solvent having a gamma c hydrogen bonding parameter value greater than 9.0, the coating solution having dispersed therein a titanyl fluorophthalocyanine pigment which exhibits major x-ray diffractogram peaks, obtained with CuK alpha radiation, at Bragg angles (2θ±0.2) of 6.6, 7.1, 9.8, 11.6, 12.9, 14.9, 15.8, 18.2, 20.7, 23.2, 24.3, 27.0, 31.0, 32.5, 34.5, and 37.1.
Claim 12
Dependent Claim
23 words
The electrophotographic element of claim 9, wherein the organic solvent having a gamma c hydrogen bonding parameter value greater than 9.0 comprises tetrahydrofuran.
Claim 13
Dependent Claim
14 words
The electrophotographic element of claim 9, wherein the titanyl fluorophthalocyanine pigment comprises titanyl tetrafluorophthalocyanine.
Claim 14
Dependent Claim
24 words
The electrophotographic element of claim 9, wherein the photoconductive layer is a charge generation layer, and the element further comprises a charge transport layer.
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