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US5155000A
Expired / Lapsed
US
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Toner composition containing TiO2 particles
Assignee: Fujifilm Business Innovation Corp
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Filing: 1989-11-14
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Granted: 1992-10-13
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Expires: 2009-11-14
Abstract
Abstract A dry toner composition containing titanium dioxide particles, the surfaces of the particles comprising an organic compound having a melting point of from about 40° C. to about 150° C.
Inventors
- 👤 Yasuo Matsumura
- 👤 Takayoshi Aoki
- 👤 Masayuki Takeda
- 👤 Chiaki Suzuki
- 👤 Ikutaroh Nagatsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:34
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09716
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
A toner composition comprising a mixture of toner particles containing a colorant and a binder resin and titanium dioxide particles provided with a surface coating of an organic compound having a melting point of from about 40° C. to about 150° C. to prevent coagulation of the titanium dioxide particles.
Claim 2
Dependent Claim
50 words
A toner composition comprising a mixture of toner particles containing a colorant and a binder resin and titanium dioxide particles provided with a surface coating of an organic compound having a melting point of from about 40° C. to about 150° C. to prevent coagulation of the titanium dioxide particles.
Claim 3
Dependent Claim
30 words
A toner composition as in claim 1, wherein said titanium dioxide particles are present in an amount of from about 0.1 to about 5 wt % based on said toner.
Claim 4
Dependent Claim
17 words
A toner composition as in claim 2, wherein said amount is from 0.5 to 3 wt %.
Claim 5
Dependent Claim
90 words
A toner composition as in claim 1, wherein said organic compound is at least one compound selected from the group consisting of saturated fatty acids having from 13 to 39 carbon atoms, normal acetylene fatty acids having from 11 to 22 carbon atoms, ω-phenyl fatty acids represented by the formula C.sub.6 H.sub.5 (CH.sub.2).sub.n-1 COOH (n=2 or 3), ω-cyclohexyl fatty acids represented by the formula C.sub.6 H.sub.11 (CH.sub.2).sub.n-1 COOH (n≧10), fatty acid esters, mono-, di- or tri-glycerides, trimethylol propane, aliphatic alcohols having 15 or more carbon atoms, and fatty acid amides.
Claim 6
Dependent Claim
36 words
A toner composition as in claim 4, wherein said organic compound is at least one compound selected from the group consisting of trimethylol propane, cetyl alcohol, stearic acid amide, oleic acid amide, and ricinoleic acid amide.
Claim 7
Dependent Claim
33 words
A toner composition as in claim 1, wherein said titanium dioxide comprises a rutile structure or an anatase structure and said particles have a primary particle size of about 1.0 μm or lower.
Claim 8
Dependent Claim
24 words
A toner composition as in claim 1, wherein said organic compound has been coated over substantially the entire surface of the titanium dioxide particles.
Claim 9
Dependent Claim
17 words
A toner composition as in claim 1, wherein said organic compound is cetyl alcohol or trimethylol propane.
Claim 10
Dependent Claim
19 words
A toner composition as in claim 1, wherein the surface coating provided on said titanium dioxide particles is uniform.
References Cited (Backward Citations)
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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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |