US4476212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of electrostatographic toner material
Assignee: Fujifilm Holdings Corp
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Filing: 1982-12-23
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Granted: 1984-10-09
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Expires: 2002-12-23
Abstract
Abstract In a process for the preparation of an electrostatographic toner material suitably employable for pressure fixing process, comprising encapsulating a core material containing colorant with a shell material selected from the group consisting of a melamine resin and a urea resin in an aqueous medium to prepare encapsulated toner particles and spray-drying the so prepared toner particles, the improvement in which the spray-drying of the toner particles is carried out in the presence of a cationic compound selected from the group consisting of a cationic surface active agent and a cationic polymer.
Inventors
- 👤 Fujio Kakimi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:26
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093
Claims Analysis
Total Claims: 5
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 selected from the group consisting of a melamine resin and a urea resin in an aqueous medium to prepare encapsulated toner particles and spray-drying the so prepared toner particles, the improvement in which the spray-drying of the toner particles is carried out in the presence of a cationic compound selected from the group consisting of a cationic surface active agent and a cationic polymer, and the spray-dried toner particles are then provided with a hydrophobic silica flow lubricant.
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 selected from the group consisting of a melamine resin and a urea resin in an aqueous medium to prepare encapsulated toner particles and spray-drying the so prepared toner particles, the improvement in which the spray-drying of the toner particles is carried out in the presence of a cationic compound selected from the group consisting of a cationic surface active agent and a cationic polymer, and the spray-dried toner particles are then provided with a hydrophobic silica flow lubricant.
Claim 3
Dependent Claim
23 words
The process for the preparation of an electrostatographic toner material claimed in claim 1, in which the shell material is a melamine resin.
Claim 4
Dependent Claim
24 words
The process for the preparation of an electrostatographic toner material claimed in claim 1, in which the cationic compound is a quaternary ammonium salt.
Claim 5
Dependent Claim
21 words
The process for the preparation of an electrostatographic toner material claimed in claim 1, in which the cationic compound is polyethyleneimine.
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) | 1987-10-09 | 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 |