US4568624A
Expired / Lapsed
US
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Toner composition having a dye composition
Assignee: Orient Chemical Industries Ltd
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Filing: 1984-09-24
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Granted: 1986-02-04
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Expires: 2004-09-24
Abstract
Abstract A dye composition prepared by polymerizing an unsaturated monomer in the presence of a quinoneimine dye and an azo initiator in amounts expressed by x≧5 and y≧0.33x 1 .2 wherein x is the amount of the quinoneimine dye in % by weight based on the unsaturated monomer, and y is the amount of the azo initiator in % by weight based on the unsaturated monomer. The composition is useful for preparing toners for developing electrostatic images because of its outstanding charge control effect and also for preparing electrostatic coating powder compositions.
Inventors
- 👤 Tetsuya Ohshima
- 👤 Hisashi Senshu
- 👤 Takeshi Matsuyama
- 👤 Yoji Kawagishi
- 👤 Takuo Andoh
- 👤 Takashi Kiryu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:03
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/0922; C; C08; C08F; C08F2/00; C08F2/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A toner for developing electrostatic images which comprises a charge control agent in the form of a dye composition prepared by polymerizing an unsaturated monomer in the presence of a quinoneimine dye and an azo initiator in amounts expressed by x≧5 and y≧0.33x 1 .2 wherein x is the amount of the quinoneimine dye in % by weight based on the unsaturated monomer, and y is the amount of the azo initiator in % by weight based on the unsaturated monomer, the dye composition being admixed with a binder to provide a toner for developing electrostatic images in which the dye composition is present in a reduced amount as compared to the amount otherwise needed to obtain a corresponding charge control effect for the toner.
Claim 2
Dependent Claim
125 words
A toner for developing electrostatic images which comprises a charge control agent in the form of a dye composition prepared by polymerizing an unsaturated monomer in the presence of a quinoneimine dye and an azo initiator in amounts expressed by x≧5 and y≧0.33x 1 .2 wherein x is the amount of the quinoneimine dye in % by weight based on the unsaturated monomer, and y is the amount of the azo initiator in % by weight based on the unsaturated monomer, the dye composition being admixed with a binder to provide a toner for developing electrostatic images in which the dye composition is present in a reduced amount as compared to the amount otherwise needed to obtain a corresponding charge control effect for the toner.
Claim 3
Dependent Claim
29 words
Toner of claim 1 wherein the dye composition is present in amounts of 0.01% to 10% by weight, calculated as the quinoneimine dye to be contained in the toner.
Claim 4
Dependent Claim
11 words
Toner of claim 1 wherein the toner includes a coloring agent.
Claim 5
Dependent Claim
65 words
Toner of claim 1 wherein which toner includes a coloring agent and a binder admixed with the dye composition to provide a toner for developing electrostatic images in which the dye composition is present in a reduced amount of up to 50%, correspondingly calculated on a single compound of dye, of the amount otherwise needed to obtain a corresponding charge control effect for the toner.
References Cited (Backward Citations)
US4299903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |