US4455362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of encapsulated electrostatographic toner material
Assignee: Fujifilm Holdings Corp
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Filing: 1982-11-24
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Granted: 1984-06-19
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Expires: 2002-11-24
Abstract
Abstract In a process for the preparation of an electrostatographic toner material comprising encapsulating a core material containing colorant with a shell material in an aqueous medium to prepare encapsulted toner particles and drying the so prepared encapsulted toner particles, the improvement which comprises washing the encapsulated toner particles with an aqueous solution of a surface active agent in advance of subjecting them to the drying procedure.
Inventors
- 👤 Takashi Naoi
- 👤 Fujio Kakimi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09392
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
In a process for the preparation of an electrostatographic toner material comprising encapsulating a core material containing colorant with a shell material in an aqueous medium in the presence of a hydrophilic protective colloid to prepare encapsulated toner particles and drying the so prepared encapsulated toner particles, the improvement which comprises washing the encapsulated toner particles with an aqueous solution containing 0.3 to 10 percent by weight of at least one surface active agent selected from the group consisting of an anionic surface active agent and a nonionic surface active agent in advance of subjecting them to the drying procedure.
Claim 2
Dependent Claim
100 words
In a process for the preparation of an electrostatographic toner material comprising encapsulating a core material containing colorant with a shell material in an aqueous medium in the presence of a hydrophilic protective colloid to prepare encapsulated toner particles and drying the so prepared encapsulated toner particles, the improvement which comprises washing the encapsulated toner particles with an aqueous solution containing 0.3 to 10 percent by weight of at least one surface active agent selected from the group consisting of an anionic surface active agent and a nonionic surface active agent in advance of subjecting them to the drying procedure.
Claim 3
Dependent Claim
28 words
The process as claimed in claim 1, in which the concentration of the surface active agent in the aqueous solution ranges from 0.5 to 2 percent by weight.
Claim 4
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 5
Dependent Claim
22 words
The process as claimed in claim 3, in which the interfacial polymerizaton is accomplished using polyisocyanate and polyol, polyamine, or mixtures thereof.
Claim 6
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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |