Patent US4623604A successfully refreshed from Google Patents.
US4623604A
Expired / Lapsed
US
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Triboelectric stabilized toner for developing electrically charged images and a method for the production thereof
Assignee: Konica Minolta Inc
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Filing: 1985-01-25
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Granted: 1986-11-18
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Expires: 2005-01-25
Abstract
Abstract Toner for developing electrostatically charged images comprising nuclear particles formed by polymerization, hydrophobic silica, and a resin, wherein said resin is coated on said nuclear particles and said silica is dispersed in said resin. A method for producing said toner is also disclosed, said method comprising polymerizing nuclear particles, dissolving a resin in a solvent, which asserts a lesser solvating action against said nuclear particles than against said resin, to form a solution, dispersing said hydrophobic silica in said solution, mixing said nuclear particles with said dispersion, and drying said mixture.
Inventors
- 👤 Hiroyuki Takagiwa
- 👤 Kenzi Thuzita
- 👤 Goichi Yamakawa
- 👤 Makoto Tomono
- 👤 Saburo Wakimoto
- 👤 Sadayasu Miyahara
- 👤 Tetsumasa Ishida
- 👤 Yoshihiko Hyosu
- 👤 Tsuneo Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:55
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/097; G03G9/09708; G03G9/09716
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
41 words
A toner for developing electrostatically charged images comprising colorant-containing nuclear particles formed by polymerization, hydrophobic silica, and a resin, wherein said resin is coated on the surface of said nuclear particles and said silica is dispersed in said resin surface coating.
Claim 2
Dependent Claim
41 words
A toner for developing electrostatically charged images comprising colorant-containing nuclear particles formed by polymerization, hydrophobic silica, and a resin, wherein said resin is coated on the surface of said nuclear particles and said silica is dispersed in said resin surface coating.
Claim 3
Dependent Claim
36 words
The toner of claim 1, further comprising hydrophobic silica contained in said resin coated layer wherein the ratio if hydrophobic silica contained in aforesaid resin coated layer to total toner is 0.1 to 10 weight %.
Claim 4
Dependent Claim
16 words
The toner of claim 1 wherein said nuclear particles have diameters of 1 to 50 microns.
Claim 5
Dependent Claim
26 words
The toner of claim 1 wherein said nuclear particles are cross linked in the presence of at least of a cross linking agent and a pre-polymer.
Claim 6
Dependent Claim
27 words
The toner of claim 1 wherein said resin is at least one selected from the group consisting of styrene, olefin hydrocarbon, terpine and non-styrene aromatic hydrocarbon resins.
Claim 7
Dependent Claim
23 words
The toner of claim 1 wherein said resin is present, based upon said toner, in an amount of 0.5 to 10 w/w %.
Claim 8
Dependent Claim
21 words
The toner of claim 1 further comprising a dye wherein said dye is present on the surface of said nuclear particles.
Claim 9
Dependent Claim
39 words
The toner of claim 7, further comprising hydrophobic silica contained in said resin coated layer wherein the precentage by weight of hydrophobic silica contained in said resin coated layer to the toner in the aggregate is 0.1 to 10%.
Claim 10
Dependent Claim
17 words
The toner of claim 7 wherein said nuclear particles have a diameter of 1 to 50 microns.
Claim 11
Dependent Claim
27 words
The toner of claim 7 wherein said nuclear particles are cross linked in the presence of at least one of a cross linking agent and a pre-polymer.
Claim 12
Dependent Claim
27 words
The toner of claim 7 wherein said resin is at least one selected from the group consisting of styrene, olefin hydrocarbon, terpine and non-styrene aromatic hydrocarbon resins.
Claim 13
Dependent Claim
23 words
The toner of claim 7 wherein said resin is present, based upon said toner, in an amount of 0.5 to 10 w/w %.
Claim 14
Dependent Claim
12 words
The toner of claim 7 wherein said dyes are acidic or basic.
Claim 15
Dependent Claim
23 words
The toner of claim 7 wherein said dyes are present, based upon said toner, in an amount of 0.1 to 5 w/w %.
Claim 16
Independent Claim
63 words
A method for producing a toner for developing electrostatically charged images comprising polymerizing colorant-containing nuclear particles, dissolving a resin in the solvent which exerts a lesser solvating action against said nuclear particles than against said resin to form a solution, dispersing hydrophobic silica in said solution, mixing said nuclear particles with said dispersion to form a silica-containing outer coating, and drying said mixture.
Claim 17
Independent Claim
63 words
A method for producing a toner for developing electrostatically charged images comprising polymerizing colorant-containing nuclear particles, dissolving a resin in the solvent which exerts a lesser solvating action against said nuclear particles than against said resin to form a solution, dispersing hydrophobic silica in said solution, mixing said nuclear particles with said dispersion to form a silica-containing outer coating, and drying said mixture.
Claim 18
Dependent Claim
15 words
The method of claim 15 wherein said solvent is an aliphatic hydrocarbon or isoparaffin solvent.
Claim 19
Dependent Claim
39 words
The method of claim 15 further comprising dispersing a dye in an aqueous medium, agitating said dye dispersion in the presence of said nuclear particles resulting in dyed particles, and drying said dyed particles prior to said mixing step.
Claim 20
Dependent Claim
15 words
The method of claim 17 wherein said solvent is an aliphatic hydrocarbon or isoparaffin solvent.
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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |