US4476211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of electrostatographic toner material provided with surface electroconductivity
Assignee: Fujifilm Holdings Corp
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Filing: 1982-12-08
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Granted: 1984-10-09
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Expires: 2002-12-08
Abstract
Abstract A process for the preparation of an electrostatographic toner material suitably employable for the pressure fixing process which is provided with a colored electroconductive powder on the outer surface, which comprises encapsulating pressure fixable adhesive core material containing colorant and magnetizable substance with shell material in an aqueous medium to prepare encapsulated toner particles and spray-drying the so prepared encapsulated toner particles together with the colored electroconductive powder.
Inventors
- 👤 Noriyuki Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:08
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09307; G03G9/09342; G03G9/09392
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A process for the preparation of an electrostatographic toner material comprising encapsulated toner particles having colored electroconductive powder affixed to their outer surface, which comprises encapsulating a pressure fixable adhesive core material containing a colorant and a magnetizable substance with a shell material selected from the group consisting of polyurethane, polyamide, polyester, polysulfonamide, polyurea, epoxy resin and polysulfonates, in an aqueous medium to prepare encapsulated toner particles and spray-drying the thus prepared encapsulated toner particles together with the colored electroconductive powder.
Claim 2
Dependent Claim
81 words
A process for the preparation of an electrostatographic toner material comprising encapsulated toner particles having colored electroconductive powder affixed to their outer surface, which comprises encapsulating a pressure fixable adhesive core material containing a colorant and a magnetizable substance with a shell material selected from the group consisting of polyurethane, polyamide, polyester, polysulfonamide, polyurea, epoxy resin and polysulfonates, in an aqueous medium to prepare encapsulated toner particles and spray-drying the thus prepared encapsulated toner particles together with the colored electroconductive powder.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, in which the colored electroconductive powder is a powdery carbonaceous substance.
Claim 4
Dependent Claim
15 words
The process as claimed in claim 2, in which the carbonaceous substance is carbon black.
Claim 5
Dependent Claim
25 words
The process as claimed in claim 1, in which the spray-dried encapsulated toner particles are heated to a temperature ranging from 50° to 300° C.
Claim 6
Dependent Claim
19 words
The process as claimed in claim 1, in which the shell material is polyurethane, polyurea or a mixture thereof.
Claim 7
Dependent Claim
22 words
The process as claimed in claim 1, in which the encapsulation of the core material is accomplished by an interfacial polymerization method.
Claim 8
Dependent Claim
19 words
The process as claimed in claim 6, in which the interfacial polymerization is accomplished using polyisocyanate, polyol and/or polyamide.
Claim 9
Dependent Claim
22 words
The process as claimed in claim 1, in which the encapsulation of the core material is accomplished by an inner polymerization method.
References Cited (Backward Citations)
US3196032A
Cited
US4254201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |