Patent US4473628A successfully refreshed from Google Patents.
US4473628A
Expired / Lapsed
US
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Toner for developing of electrostatic latent image
Assignee: Konica Minolta Inc
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Filing: 1983-12-06
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Granted: 1984-09-25
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Expires: 2003-12-06
Abstract
Abstract A toner for developing an electrostatic latent image comprising a resin prepared by emulsion polymerization of a first polymer to yield a first emulsion, emulsion polymerization of a second polymer to yield a second emulsion, mixing said first and second emulsions and coagulating said mixture, wherein said second polymer has characteristics different from those of said first polymer.
Inventors
- 👤 Takahira Kasuya
- 👤 Hideaki Morita
- 👤 Goichi Yamakawa
- 👤 Makoto Tomono
- 👤 Isao Furuta
- 👤 Minoru Tsuneyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:05
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/081; G03G9/0804; G03G9/0806; G03G9/0815
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A toner for developing an electrostatic latent image which comprises a resin prepared by emulsion polymerizing a first polymer to yield a first emulsion, emulsion polymerizing a second polymer to yield a second emulsion, mixing said first and second emulsions and coagulating said mixture wherein said second polymer has characteristics different from those of the first polymer.
Claim 2
Dependent Claim
57 words
A toner for developing an electrostatic latent image which comprises a resin prepared by emulsion polymerizing a first polymer to yield a first emulsion, emulsion polymerizing a second polymer to yield a second emulsion, mixing said first and second emulsions and coagulating said mixture wherein said second polymer has characteristics different from those of the first polymer.
Claim 3
Dependent Claim
13 words
A toner according to claim 1, wherein said resin comprises a styrene/butadiene copolymer.
Claim 4
Dependent Claim
27 words
A toner according to claim 1, wherein said first polymer is a high molecular weight polymer, and wherein said second polymer is a low molecular weight polymer.
Claim 5
Dependent Claim
21 words
A toner according to claim 3, wherein said high molecular weight polymer and low molecular weight polymer independently comprise styrene/butadiene copolymer.
Claim 6
Dependent Claim
29 words
A toner according to claim 2, wherein said resin further comprises an additional resin being a styrene resin, a styrene-acrylic acid ester copolymer or a styrene-methacrylic acid ester copolymer.
Claim 7
Dependent Claim
25 words
A toner according to claim 5, wherein the additional resin is used in an amount of less than 40 wt % of the binder resin.
Claim 8
Dependent Claim
80 words
A process for the preparation of a toner for developing an electrostatic latent image which comprises a resin prepared by emulsion polymerizing a first polymer to yield a first emulsion, emulsion polymerizing a second polymer to yield a second emulsion, mixing said first and said second emulsions and coagulating said mixture, wherein said second polymer has characteristics different from those of said first polymer, separating said resin from the emulsion mixture and dehydrating said resin to provide a solid product.
Claim 9
Dependent Claim
80 words
A process for the preparation of a toner for developing an electrostatic latent image which comprises a resin prepared by emulsion polymerizing a first polymer to yield a first emulsion, emulsion polymerizing a second polymer to yield a second emulsion, mixing said first and said second emulsions and coagulating said mixture, wherein said second polymer has characteristics different from those of said first polymer, separating said resin from the emulsion mixture and dehydrating said resin to provide a solid product.
References Cited (Backward Citations)
US4246332A
Cited
US4299903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |