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US4869990A
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Toner for use in electrostatography
Assignee: Fujifilm Holdings Corp
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Filing: 1988-01-19
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Granted: 1989-09-26
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Expires: 2008-01-19
Abstract
Abstract An improved electrostatographic toner comprises toner particles which comprise a colorant and a binder, wherein to a surface of said toner particle are attached polymer chains formed by a graft polymerization reaction of a monomer having two or more polymerizable double bonds and a monomer having a charge-control group and a polymerizable double bond.
Inventors
- 👤 Noriyuki Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:05
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08786
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
An electrostatographic toner prepared by the process of graft polymerizing a monomer having at least two polymerizable double bonds and a monomer having a charge-control group and polymerizable double bond in the presence of toner particles comprising a colorant and a binder so as to attach said graft polymer to the surface of said toner particle.
Claim 2
Dependent Claim
56 words
An electrostatographic toner prepared by the process of graft polymerizing a monomer having at least two polymerizable double bonds and a monomer having a charge-control group and polymerizable double bond in the presence of toner particles comprising a colorant and a binder so as to attach said graft polymer to the surface of said toner particle.
Claim 3
Dependent Claim
36 words
The electrostatographic toner as claimed in claim 1, wherein said toner particle is in the form of micro-capsule comprising a core which comprises an oily binder and a colorant and a resin shell enclosing said core.
Claim 4
Dependent Claim
96 words
The electrostatographic toner as claimed in claim 1, wherein said monomer having at least two polymerizable double bonds is a compound selected from the group consisting of a polyacrylate of a polyhydric alcohol, a polymerthacrylate of a polyhydric alcohol, a reaction product of acrylic acid and an amine which has at least two acrylic groups, a reaction product of methacrylic acid and an amine which has at least two methacrylic groups, a polyvinyl ether of a polyhydric alcohol, a polyvinyl ester of a polyvalent carboxylic acid and an aromatic compound having at least two vinyl groups.
Claim 5
Dependent Claim
59 words
The electrostatographic toner as claimed in claim 1, wherein said monomer having a charge-control group and a polymerizable double bond is a compound having a charge-control group selected from the group consisting of nitro group, carboxyl group, carbonyl group, nitrile group, fluorine atom, cyano group, a substituted or unsubstituted amino group and hydroxyl group, and a polymerizable double bond.
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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |