US5118588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner particles having improved transfer efficiency and which comprise a pigment surface modifier
Assignee: Eastman Kodak Co
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Filing: 1990-03-30
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Granted: 1992-06-02
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Expires: 2010-03-30
Abstract
Abstract Pigmented toner particles are provided wherein, because of treatment with a surface modifier, an initially hydrophilic, sub-micron sized pigment is made hydrophobic. Toner particles are produced wherein the pigment is dispersed internally leaving surfaces substantially free from pigment.
Inventors
- 👤 Mridula Nair
- 👤 Zona R. Pierce
- 👤 Louis J. Sorriero
- 👤 Dinesh Tyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:35
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0902; G03G9/0904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
Pigmented toner particles that comprise: an initially hydrophilic, sub-micron sized pigment; a pigment surface modifier that contains at least one functional group per molecule sufficiently interactive to render the surface of the pigment hydrophobic; and a thermoplastic polymer wherein each of said toner particles has said thermoplastic polymer as a matrix phase wherein said particle surfaces are substantially free from said pigment.
Claim 2
Dependent Claim
62 words
Pigmented toner particles that comprise: an initially hydrophilic, sub-micron sized pigment; a pigment surface modifier that contains at least one functional group per molecule sufficiently interactive to render the surface of the pigment hydrophobic; and a thermoplastic polymer wherein each of said toner particles has said thermoplastic polymer as a matrix phase wherein said particle surfaces are substantially free from said pigment.
Claim 3
Dependent Claim
21 words
The toner particles of claim 1 which have a particle size in the range of about 1 to about 100 microns.
Claim 4
Dependent Claim
13 words
The toner particles of claim 1 that further comprises a charge control agent.
Claim 5
Dependent Claim
37 words
The toner particles of claim 1 which contain: greater than 0 to about 20 weight percent pigment; greater than 0 to about 10 weight percent surface modifier; and about 70 to about 99.95 weight percent thermoplastic polymer.
Claim 6
Dependent Claim
12 words
The toner particles of claim 1 wherein said pigment is carbon black.
Claim 7
Dependent Claim
48 words
The toner particles of claim 1 wherein said thermoplastic polymer is a copolymer comprised of about 1 to about 5 weight percent of methacrylic acid and about 95 to 99 weight percent of styrene and has a molecular weight in the range of about 1,000 to about 30,000.
Claim 8
Dependent Claim
50 words
The toner particles of claim 1 wherein said thermoplastic polymer comprises a copolymer of about 70 to about 95 weight percent of styrene and about 5 to about 30 of butyl acrylate and said copolymer has a number average molecular weight in the range of about 2,000 to about 100,000.
Claim 9
Dependent Claim
19 words
The toner particles of claim 1 wherein the thermoplastic polymer is the only polymeric material in the toner particles.
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) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |