US3870644A
Expired / Lapsed
US
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Liquid developer for plural-color electrophotography
Assignee: Ricoh Co Ltd
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Filing: 1972-11-20
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Granted: 1975-03-11
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Expires: 1992-11-20
Abstract
Abstract A set of liquid developers for plural-color electrophotography, comprising carrier liquids and toners of four colors separately dispersed in said carrier liquid for each color, said toners being selected from the group consisting of: A. A TONER CONSISTING SUBSTANTIALLY OF COLORING AGENTS FOR FOUR COLORS AND FINELY DIVIDED PARTICLES OF COLORLESS, TRANSPARENT ORGANIC PHOTOCONDUCTIVE SUBSTANCE COLORED SEVERALLY BY SAID FOUR COLORING AGENTS; B. A TONER CONSISTING SUBSTANTIALLY OF COLORING AGENTS FOR FOUR COLORS, FINELY DIVIDED PARTICLES OF COLORLESS, TRANSPARENT ORGANIC PHOTOCONDUCTIVE SUBSTANCE COLORED SEVERALLY BY SAID FOUR COLORING AGENTS, AND ONE COATING AGENT COATED ON THE SURFACE OF SAID COLORED PHOTOCONDUCTIVE SUBSTANCE AND SELECTED FROM THE GROUP CONSISTING OF HITHERTO KNOWN COATING RESINS FOR TONER AND SUCH VINYL POLYMERS AS ARE INSOLUBLE IN SAID CARRIER LIQUID; AND C. A TONER CONSISTING SUBSTANTIALLY OF COLORING AGENTS FOR FOUR COLORS, FINELY DIVIDED PARTICLES OF COLORLESS, TRANSPARENT ORGANIC PHOTOCONDUCTIVE SUBSTANCE COLORED SEVERALLY BY SAID FOUR COLORING AGENTS, AND A POLYMER COATED ON THE SURFACE OF SAID COLORED PHOTOCONDUCTIVE SUBSTANCE AND HAVING AN AFFINITY WITH SAID CARRIER LIQUID.
Inventors
- 👤 Hazime Machida
- 👤 Zenjiro Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:45
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/122; G03G9/13; G03G9/131; G03G9/135; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
In a set of liquid developers for plural-color electrophotography, in which each developer comprises a toner dispersed in a carrier liquid, said carrier liquid being a liquid hydrocarbon having an electric resistance of at least 109 Omega .cm and a dielectric constant of not greater than 3, said set of liquid developers comprising separate liquid developers respectively containing as the only toner present therein a. a magenta-color toner consisting essentially of finely divided particles of photoconductive substance colored with a magenta-coloring agent; b. a cyan-color toner consisting essentially of finely divided particles of photoconductive substance colored with a cyan-coloring agent; c. a black-color toner consisting essentially of finely divided particles of photoconductive substances colored with a black-coloring agent; d. a yellow-color toner consisting essentially of finely divided particles of photoconductive substance colored with a yellow-coloring agent, the improvement which comprises: the photoconductive substance in each of said toners is a colorless, transparent photoconductive substance selected from the group consisting of anthracene, imidazole, carbazole, poly-3,6-dibromovinylcarbazole, poly-2,3-dichlorovinylcarbazole, poly-2,4-dichlorovinylcarbazole, poly-3,6-dichlorovinylcarbazole, poly-3-bromo-6-chlorovinylcarbazole, poly-3-bromovinylcarbazole, poly-3-chlorovinylcarbazole, poly-N-vinylcarbazole, polyvinyllanthracene, polyvinylcarbazole, polydimethylaminostyrene, polyorthobromocarbazole, poly-2,3-dichlorovinylanthracene, polyorthochlorovinylcarbazole, poly-2, 4-dichlorocarbazole, and poly-2-chlorovinylanthracene.
Claim 2
Dependent Claim
181 words
In a set of liquid developers for plural-color electrophotography, in which each developer comprises a toner dispersed in a carrier liquid, said carrier liquid being a liquid hydrocarbon having an electric resistance of at least 109 Omega .cm and a dielectric constant of not greater than 3, said set of liquid developers comprising separate liquid developers respectively containing as the only toner present therein a. a magenta-color toner consisting essentially of finely divided particles of photoconductive substance colored with a magenta-coloring agent; b. a cyan-color toner consisting essentially of finely divided particles of photoconductive substance colored with a cyan-coloring agent; c. a black-color toner consisting essentially of finely divided particles of photoconductive substances colored with a black-coloring agent; d. a yellow-color toner consisting essentially of finely divided particles of photoconductive substance colored with a yellow-coloring agent, the improvement which comprises: the photoconductive substance in each of said toners is a colorless, transparent photoconductive substance selected from the group consisting of anthracene, imidazole, carbazole, poly-3,6-dibromovinylcarbazole, poly-2,3-dichlorovinylcarbazole, poly-2,4-dichlorovinylcarbazole, poly-3,6-dichlorovinylcarbazole, poly-3-bromo-6-chlorovinylcarbazole, poly-3-bromovinylcarbazole, poly-3-chlorovinylcarbazole, poly-N-vinylcarbazole, polyvinyllanthracene, polyvinylcarbazole, polydimethylaminostyrene, polyorthobromocarbazole, poly-2,3-dichlorovinylanthracene, polyorthochlorovinylcarbazole, poly-2, 4-dichlorocarbazole, and poly-2-chlorovinylanthracene.
Claim 3
Dependent Claim
179 words
IN A SET OF LIQUID DEVELOPERS FOR PLURAL-COLOR ELECTROPHOTOGRAPHY, IN WHICH EACH DEVELOPER COMPRISES A TONER DISPERSED IN A CARRIER LIQUID, SAID CARRIER LIQUID BEING A LIQUID HYDROCARBON HAVING AN ELECTRIC RESISTANCE OF AT LEAST 10**9$ CM. AND A DIELECTRIC CONSTANT OF NOT GREATER THAN 3, SAID SET OF LIQUID DEVELOPERS COMPRISING SEPARATE LIQUID DEVELOPERS RESPECTIVELY CONTAINING AS THE ONLY TONER PRESENT THEREIN A. A MAGNETA-COLOR TONER CONSITING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCE COLORED WITH A MAGENTA-COLORING AGENT; B. A CYAN-COLOR TONER CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCE COLORED WITH A CYAN-COLORING AGENT; C. A BLACK-COLOR TONER CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCES COLORED WITH A BLACK-COLORING AGENT; D. A YELLOW-COLOR TONER CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCE COLORED WITH A YELLOW-COLORING AGENT, THE IMPROVEMENT WHICH COMPRISES: THE PHOTOCONDUCTIVE SUBSTANCE IN EACH OF SAID TONERS IS A COLORELESS, TRANSPARENT PHOTOCONDUCTIVE SUBTANCE SELECTED FROM THE GROUP CONSISTING OF ANTHRACENE, IMIDAZOLE, CARBAZOLE, POLY-3,6-DIBROMOVINYLCARBAZOLE, POLY-2,3-DICHLOROVINYLCARBAZOLE, POLY-2,4DICHLOROVINYLCARBAZOLE, POLY-3,6-DICHLOROVINYLCARBAZOLE, POLY-3-BROMO-6-CHLOROVINYLCARBAZOLE, POLY-3BROMOVINYLCARBAZOLE, POLY-3-CHLOROVINYLCARBAZOLE, POLYN-VINYLCARBAZOLE, POLYVINYLLANTHRACENE, POLYVINYLCARBAZOLE, POLYDIMETHYLAMINOSTYRENE, POLYORTHOBROMOCARBAZOLE, POLY-2,3-DICHLOROVINYLANTHRACENE, POLYORTHOCHLOROVINYLCARBAZOLE, POLY-2,4-DICHLOROCARBAZOLE, AND POLY-2-CHLOROVINYLANTHRACENE.
Claim 4
Dependent Claim
179 words
IN A SET OF LIQUID DEVELOPERS FOR PLURAL-COLOR ELECTROPHOTOGRAPHY, IN WHICH EACH DEVELOPER COMPRISES A TONER DISPERSED IN A CARRIER LIQUID, SAID CARRIER LIQUID BEING A LIQUID HYDROCARBON HAVING AN ELECTRIC RESISTANCE OF AT LEAST 10**9$ CM. AND A DIELECTRIC CONSTANT OF NOT GREATER THAN 3, SAID SET OF LIQUID DEVELOPERS COMPRISING SEPARATE LIQUID DEVELOPERS RESPECTIVELY CONTAINING AS THE ONLY TONER PRESENT THEREIN A. A MAGNETA-COLOR TONER CONSITING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCE COLORED WITH A MAGENTA-COLORING AGENT; B. A CYAN-COLOR TONER CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCE COLORED WITH A CYAN-COLORING AGENT; C. A BLACK-COLOR TONER CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCES COLORED WITH A BLACK-COLORING AGENT; D. A YELLOW-COLOR TONER CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF PHOTOCONDUCTIVE SUBSTANCE COLORED WITH A YELLOW-COLORING AGENT, THE IMPROVEMENT WHICH COMPRISES: THE PHOTOCONDUCTIVE SUBSTANCE IN EACH OF SAID TONERS IS A COLORELESS, TRANSPARENT PHOTOCONDUCTIVE SUBTANCE SELECTED FROM THE GROUP CONSISTING OF ANTHRACENE, IMIDAZOLE, CARBAZOLE, POLY-3,6-DIBROMOVINYLCARBAZOLE, POLY-2,3-DICHLOROVINYLCARBAZOLE, POLY-2,4DICHLOROVINYLCARBAZOLE, POLY-3,6-DICHLOROVINYLCARBAZOLE, POLY-3-BROMO-6-CHLOROVINYLCARBAZOLE, POLY-3BROMOVINYLCARBAZOLE, POLY-3-CHLOROVINYLCARBAZOLE, POLYN-VINYLCARBAZOLE, POLYVINYLLANTHRACENE, POLYVINYLCARBAZOLE, POLYDIMETHYLAMINOSTYRENE, POLYORTHOBROMOCARBAZOLE, POLY-2,3-DICHLOROVINYLANTHRACENE, POLYORTHOCHLOROVINYLCARBAZOLE, POLY-2,4-DICHLOROCARBAZOLE, AND POLY-2-CHLOROVINYLANTHRACENE.
Claim 5
Dependent Claim
113 words
A set of liquid developers for plural-color electrophotography according to claim 1, wherein said toners are respectively coated with a coating agent selected from the group consisting of: a polymer comprising at least one monomer selected from the group consisting of vinyl monomers expressed by the below-mentioned formula (1); a polymer comprising at least one vinyl monomer selected from the group consisting of monomers expressed by the below-mentioned formula (2); and a copolymer comprising at least one monomer selected from the group consisting of vinyl monomers expressed by the below-mentioned formula (1) and at least one monomer selected from the group consisting of vinyl monomers expressed by the below-mentioned formula (2); Formula (1)
Claim 6
Dependent Claim
102 words
A set of liquid developers for plural-color electrophotography according to claim 2, wherein said toners are respectively composed of said coloring agent and products of the copolymerization reaction of: a. a monomer for forming said organic photoconductive substance selected from the group consisting of 3,6-dibromovinylcarbazole, 2,3-dichlorovinylcarbazole, 2,4-dichlorovinylcarbazole, 3,6-dichlorovinylcarbazole, 3-bromo-6-chlorovinylcarbazole, 3-bromovinylcarbazole, 3-chlorovinylcarbazole, N-vinylcarbazole, vinylanthracene, vinylcarbazole, dimethylaminostyrene, orthobromocarbazole, 2,3-dichlorovinylanthracene, orthochlorovinylcarbazole, 2,4-dichlorocarbazole and 2-chlorovinylanthracene; and b. at least one monomer selected from the group consisting of monomers expressed by said formula (1) and monomers expressed by said formula (2), the products of said copolymerization reaction being separately colored with said coloring agents for each color.
Claim 7
Dependent Claim
38 words
A set of liquid developers for plural-color electrophotography according to claim 1, wherein each said toner consists essentially of 100 parts by weight of said photoconductive substance and 1 to 100 parts by weight of said coloring agent.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |