US3615415A
Expired / Lapsed
US
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Method for the preparation of photoconductive compositions
Assignee: Eastman Kodak Co
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Filing: 1969-05-02
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Granted: 1971-10-26
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Expires: 1989-05-02
Abstract
Abstract Multiphase heterogeneous compositions are formed from an organic dye and electrically insulating polymeric material. A solution of dye and polymer is prepared and subsequently subjected to high speed shearing. Electrophotographic layers can be prepared by coating the sheared solution to form the multiphase heterogeneous compositions. Such compositions which are useful as photoconductors or electrophotosensitizers are characterized by a radiation absorption maximum that is substantially shifted from the absorption maximum of a simple, untreated solution of dye dissolved in polymer.
Inventors
- 👤 Eugene P Gramza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:51
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/02; F02M3/04; F02M3/045; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; G03G5/0528; G03G5/0532; G03G5/0535; G03G5/0539; G03G5/0542; G03G5/0546; G03G5/0557; G03G5/056; G03G5/0564; G03G5/0567; G03G5/0582; G03G5/06; G03G5/07
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A method for producing a heterogeneous photoconductive insulating composition comprising the steps of preparing a solution of an electrically insulating polymeric material having an alkylidene diarylene moiety in the recurring unit and a pyrylium dye selected from the group consisting of pyrylium, thiapyrylium and selenapyrylium dye salts, subjecting said solution to high-speed shearing for an interval of time, coating a thin layer of said solution and allowing said layer to dry to form a heterogeneous organic solid comprising a continuous phase of polymeric material having dispersed therein a discontinuous phase containing a combination of said polymeric material and dye, said shearing being performed for an interval of time at least sufficient to initiate the formation of a heterogeneous organic solid when coated and dried.
Claim 2
Dependent Claim
28 words
A method as described in claim 1 wherein electrically insulating polymeric material is a carbonate polymer and wherein said discontinuous phase is visible under at least 2500X magnification.
Claim 3
Independent Claim
133 words
A method for preparing a heterogeneous photoconductive composition comprising the steps of dissolving in an organic solvent a pyrylium dye and an electrically insulating, film-forming polymeric material having an alkylidene diarylene moiety in the recurring unit, shearing the resultant solution at least until a test coating prepared from a portion of such solution forms a heterogeneous photoconductive layer having a maximum absorption at least 10 m Mu different from the wavelength of maximum absorption of a test coating prepared from an unsheared portion of such solution, adding said sheared solution to a larger volume of a similarly constituted unsheared solution, coating the combined solutions and drying to form a heterogeneous composition comprising a continuous phase of polymeric material having dispersed therein a discontinuous phase comprising a combination of said dye and polymeric material.
Claim 4
Independent Claim
164 words
A method for preparing an electrophotographic element comprising the steps of dissolving a pyrylium dye and a polycarbonate resin having an alkylidene diarylene moiety in the recurring unit in an organic solvent, shearing the resultant solution at least until a test coating prepared from a portion of said sheared solution forms a heterogeneous photoconductive layer having an absorption maximum at least 10 m Mu different from the absorption maximum of a coating prepared from an unsheared portion of said solution, adding the sheared solution to a larger volume of a similarly constituted unsheared solution of a pyrylium dye and a polymeric material having an alkylidene diarylene moiety in the recurring unit, coating the combined solutions in a thin layer on a conductive support and drying said layer to form an electrophotographic element having a layer of a heterogeneous photoconductive composition comprising a continuous binder phase of polymeric material having dispersed therein a particulate discontinuous phase comprising a combination of said dye and polymeric material.
Claim 5
Dependent Claim
46 words
The method as described in claim 5 wherein the unsheared solution to which the sheared solution is added consists essentially of an organic solvent, a pyrylium dye, an electrically insulating, film-forming polymeric material having an alkylidene diarylene moiety in the recurring unit and an organic photoconductor.
Claim 6
Dependent Claim
36 words
The method of claim 1 wherein the electrically insulating polymeric material is a hydrophobic polymer having an alkylidene diarylene moiety in the recurring unit and wherein said discontinuous phase is visible under at least 2500X magnification.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein a photoconductive compound is added to said solution prior to shearing.
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein the dye has the formula:
Claim 9
Dependent Claim
42 words
The method of claim 1 wherein the dye is selected from the group consisting of 4-(4-dimethylaminophenyl)-2,6-diphenylthiapyrylium perchlorate; 4-(4-dimethylaminophenyl)-2,6-diphenylthiapryrylium fluoroborate; 4-(4-bis(2-chloroethyl)aminophenyl)-2,6-diphenylthiapyrylium perchlorate; 4-(4-dimethylaminophenyl)-2,6-diphenylthiapyrylium p-toluenesulfonate; 4-(4-dimethylaminophenyl)-2,6-diphenylpyrylium perchlorate; 4-(4-dimethylaminophenyl)-2,6-bis(4-ethylphenyl)thiapyrylium perchlorate; 4-(4-dimethylamino-2-methylphenyl)-2,6-diphenylpyrylium perchlorate 2-(4-methoxyphenyl)-4-(4-bis (2-chloroethyl)aminophenyl)-6-phenylthiapyrylium perchlorate; 2-(4-methoxyphenyl)-4-(dimethylaminophenyl)-6-phenylthiapryrylium perchlorate; 2-(4-ethoxyphenyl)-4-(dimethylaminophenyl)-6-phenylthiapyrylium per chlorate; 4-(4-dimethylaminophenyl)-2,6-diphenylthiapyrylium sulfate; and 4-(4-dimethylaminophenyl)-2,6-diphenylpyrylium p-toluenesulfonate.
Claim 10
Dependent Claim
37 words
The method of claim 3 wherein the dye of the sheared solution is selected from the group consisting of pyrylium and thiapyrylium dye salts and wherein the polymeric material of said sheared solution is a carbonate polymer.
Claim 11
Dependent Claim
38 words
The method of claim 3 wherein the unsheared solution to which the sheared solution is added comprises a solvent, a pyrylium dye, a hydrophobic polymer having an alkylidene diarylene moiety in the recurring unit and an organic photoconductor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |