US4803144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic encapsulated pressure fixable toner particles with electroconductive powder coating
Assignee: Fujifilm Holdings Corp
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Filing: 1987-02-19
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Granted: 1989-02-07
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Expires: 2007-02-19
Abstract
Abstract An electrostatographic toner material suitably employable for the pressure fixing process, which comprises encapsulated toner particles having an average particle size in the range from about 0.5 to 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing colorant and magnetizable substance and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with white electroconductive powder.
Inventors
- 👤 Noriyuki Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:25
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09725; G03G9/093; G03G9/09307; G03G9/09342; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
An electrostatographic toner material comprising encapsulated toner particles having an average particle size in the range from about 0.5 to about 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing colorant and magnetizable substance and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with a white powder of electroconductive stannic oxide selected from the group consisting of SnO 2 doped with 0.01-30 molar % of a donner atom selected from the group consisting of antimony, niobium, and halogen, and a combination of SnO 2 and one or more electroconductive metal oxides selected from the group consisting of oxides of zinc, titanium, aluminum, indium, silicon, magnesium, barium and molybdenum.
Claim 2
Dependent Claim
122 words
An electrostatographic toner material comprising encapsulated toner particles having an average particle size in the range from about 0.5 to about 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing colorant and magnetizable substance and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with a white powder of electroconductive stannic oxide selected from the group consisting of SnO 2 doped with 0.01-30 molar % of a donner atom selected from the group consisting of antimony, niobium, and halogen, and a combination of SnO 2 and one or more electroconductive metal oxides selected from the group consisting of oxides of zinc, titanium, aluminum, indium, silicon, magnesium, barium and molybdenum.
Claim 3
Dependent Claim
35 words
The electrostatographic toner material as claimed in claim 1 in which said powder of stannic oxide has a volume resistance not higher than 10 7 ohm-cm, the value being measured in the form of powder.
Claim 4
Dependent Claim
21 words
The electrostatographic toner material as claimed in claim 2 in which said volume resistance is not higher than 10 3 ohm-cm.
Claim 5
Dependent Claim
30 words
The electrostatographic toner material as claimed in claim 1, in which the shell is made of a polymer selected from the group consisting of polyurethane, polyurea and an amino resin.
Claim 6
Dependent Claim
25 words
The electrostatographic toner material as claimed in claim 4, in which the shell is made substantially of a polycondensation product of polyisocyanate, polyol and water.
Claim 7
Dependent Claim
25 words
The electrostatographic toner material as claimed in claim 4, in which the shell is made substantially of a polycondensation product of polyisocyanate, polyol and polyamine.
Claim 8
Dependent Claim
35 words
The electrostatographic toner material as claimed in claim 1, in which the shell is composed substantially of a complex layer comprising two or more polymers selected from the group consisting of polyurethane, polyurea and polyamide.
Claim 9
Dependent Claim
30 words
The electrostatographic toner material as claimed in claim 1, in which the pressure fixable adhesive core material is a liquid medium boiling at a temperature of higher than 180° C.
Claim 10
Dependent Claim
22 words
The electrostatographic toner material as claimed in claim 1, in which a flow lubricant is provided onto the surface of the shell.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |