US3948656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of photoconductive CdSSe
Assignee: Xerox Corp
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Filing: 1974-05-16
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Granted: 1976-04-06
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Expires: 1994-05-16
Abstract
Abstract Disclosed is an improved method for the preparation of CdSSe by the reaction in an aqueous medium of CdCO 3 with a soluble metal sulfide and selenium to form a raw cake which is subsequently calcined to form the desired product. During calcination, an inert gas is allowed to flow over the raw cake thereby forming a CdSSe pigment with improved electrical properties for use in electrostatographic copying.
Inventors
- 👤 Kenneth H. Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; C; C09; C09C; C09C1/00; C09C1/10; C09C1/12; C01; C01P; C01P2006/00; C01P2006/40
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
72 words
In the process of preparing CdSSe by the reaction in an aqueous medium of CdCO 3 with a soluble metal sulfide and selenium to form a raw cake with subsequent calcination of the raw cake at a temperature in the range of from 300° to 700°C for a time sufficient to form the desired product, the improvement which comprises providing a flow of an inert gas over the raw cake during calcination.
Claim 2
Dependent Claim
72 words
In the process of preparing CdSSe by the reaction in an aqueous medium of CdCO 3 with a soluble metal sulfide and selenium to form a raw cake with subsequent calcination of the raw cake at a temperature in the range of from 300° to 700°C for a time sufficient to form the desired product, the improvement which comprises providing a flow of an inert gas over the raw cake during calcination.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the inert gas is selected from the group of helium, neon, argon, krypton and xenon.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the inert gas is argon.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the inert gas is carbon dioxide.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the inert gas is nitrogen.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the temperature is from 450° to 550°C.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the metal sulfide is sodium sulfide and the CdCO 3 is formed by the reaction of cadmium chloride with sodium carbonate.
Claim 9
Dependent Claim
95 words
A finely divided, photoconductive CdSSe pigment having a particle size of from 0.001 to 1 micron suitable for use in a binder layer electrostatographic photoreceptor which is prepared by: a. reacting in an aqueous medium CdCO 3 with a soluble metal sulfide and selenium to form a raw cake; and b. calcining the raw cake at a temperature in the range of from 300° to 700°C for a time sufficient to form the desired product, said preparation being further defined in that an inert gas is provided to flow over the raw cake during calcination.
Claim 10
Dependent Claim
95 words
A finely divided, photoconductive CdSSe pigment having a particle size of from 0.001 to 1 micron suitable for use in a binder layer electrostatographic photoreceptor which is prepared by: a. reacting in an aqueous medium CdCO 3 with a soluble metal sulfide and selenium to form a raw cake; and b. calcining the raw cake at a temperature in the range of from 300° to 700°C for a time sufficient to form the desired product, said preparation being further defined in that an inert gas is provided to flow over the raw cake during calcination.
Claim 11
Dependent Claim
21 words
The pigment of claim 8 wherein the inert gas is selected from the group of helium, neon, argon, krypton and xenon.
Claim 12
Dependent Claim
11 words
The pigment of claim 9 wherein the inert gas is argon.
Claim 13
Dependent Claim
12 words
The pigment of claim 8 wherein the inert gas is carbon dioxide.
Claim 14
Dependent Claim
11 words
The pigment of claim 8 wherein the inert gas is nitrogen.
Claim 15
Dependent Claim
13 words
The pigment of claim 9 wherein the temperature is from 450° to 550°C.
Claim 16
Dependent Claim
27 words
The pigment of claim 8 wherein the metal sulfide is sodium sulfide and the CdCO 3 is formed by the reaction of cadmium chloride and sodium carbonate.
Claim 17
Dependent Claim
36 words
The pigment of claim 8 dispersed in an electrically insulating organic resin in the form of an electrostatographic photoreceptor comprising a binder matrix containing CdSSe pigment particles in particle-to-particle contact throughout the thickness of binder matrix.
Claim 18
Dependent Claim
18 words
The photoreceptor of claim 15 wherein the pigment is present in an amount of about 50 volume percent.
Claim 19
Independent Claim
172 words
A method for the preparation of a binder layer electrostatographic photoreceptor which comprises: a. reacting in aqueous CdCO 3 with a soluble metal sulfide and selenium to form a raw cake, b. calcining the raw cake at a temperature in the range of from 300° to 700°C for a time sufficient to form the desired product to form CdSSe having a particle size of from 0.001 to 1 micron, said reaction being further defined in that an inert gas is provided to flow over the raw cake during calcination, c. dispersing the CdSSe with particles of an electrically insulating organic resin in a carrier liquid in which neither the CdSSe nor resin are soluble, the volume ratio of CdSSe particles to particles of the electrically insulating resin being such that particle-to-particle contact of the CdSSe particles is provided, d. applying the dispersion to a substrate in the form of an even layer, e. removing the carrier fluid, and f. processing the resin to form a smooth continuous binder layer on the substrate.
Claim 20
Independent Claim
172 words
A method for the preparation of a binder layer electrostatographic photoreceptor which comprises: a. reacting in aqueous CdCO 3 with a soluble metal sulfide and selenium to form a raw cake, b. calcining the raw cake at a temperature in the range of from 300° to 700°C for a time sufficient to form the desired product to form CdSSe having a particle size of from 0.001 to 1 micron, said reaction being further defined in that an inert gas is provided to flow over the raw cake during calcination, c. dispersing the CdSSe with particles of an electrically insulating organic resin in a carrier liquid in which neither the CdSSe nor resin are soluble, the volume ratio of CdSSe particles to particles of the electrically insulating resin being such that particle-to-particle contact of the CdSSe particles is provided, d. applying the dispersion to a substrate in the form of an even layer, e. removing the carrier fluid, and f. processing the resin to form a smooth continuous binder layer on the substrate.
Claim 21
Dependent Claim
21 words
The method of claim 17 wherein the inert gas is selected from the group of helium, neon, argon, krypton and xenon.
Claim 22
Dependent Claim
11 words
The method of claim 18 wherein the inert gas is argon.
Claim 23
Dependent Claim
12 words
The method of claim 17 wherein the inert gas is carbon dioxide.
Claim 24
Dependent Claim
11 words
The method of claim 17 wherein the inert gas is nitrogen.
Claim 25
Dependent Claim
14 words
The method of claim 19 wherein the calcination temperature is from 450° to 550°C.
Claim 26
Dependent Claim
27 words
The method of claim 17 wherein the metal sulfide is sodium sulfide and the CdCO 3 is formed by the reaction of cadmium chloride and sodium carbonate.
Claim 27
Dependent Claim
27 words
The method of claim 17 wherein the organic resin is a thermoplastic resin and the binder layer is prepared by thermally fusing the resin in step (f).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |