US4288517A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for electrostatic photography containing resin coated silica particles
Assignee: Nippon Paint Co Ltd
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Filing: 1980-05-14
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Granted: 1981-09-08
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Expires: 2000-05-14
Abstract
Abstract A toner composition for electrostatic photography which comprises (A) toner powder comprising a base resin and a coloring agent and having an average particle size of not more than 30 microns and (B) silica powder coated on its surface with the base resin of the toner powder.
Inventors
- 👤 Seiji Arimatsu
- 👤 Katsukiyo Ishikawa
- 👤 Yasusi Umeda
- 👤 Koichi Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:57
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
47 words
A toner composition for electrostatic photography which comprises (A) toner powder comprising a base resin and a coloring agent and having an average particle size of not more than 30 microns and (B) silica powder coated on its surface with the base resin of the toner powder.
Claim 2
Dependent Claim
47 words
A toner composition for electrostatic photography which comprises (A) toner powder comprising a base resin and a coloring agent and having an average particle size of not more than 30 microns and (B) silica powder coated on its surface with the base resin of the toner powder.
Claim 3
Dependent Claim
66 words
The toner composition according to claim 1, wherein the toner powder (A) comprises (a) a styrene resin having a weight average molecular weight of not less than 3,000, (b) furnace type carbon black of pH 6.5 to 9.5, (c) low molecular weight polyolefin having a weight average molecular weight of not more than 10,000 and (d) an electrification-regulating agent in a weight proportion of 100:5-14 15:3-10:0.5-5.
Claim 4
Dependent Claim
32 words
The toner composition according to claim 1 or 2, wherein the content of the surface-coated silica powder (B) is 0.1 to 1% by weight on the total weight of the toner composition.
Claim 5
Dependent Claim
38 words
The toner composition according to any of claims 1 to 3, wherein the surface-coated silica powder (B) comprises silica powder and the base resin coated on the surface of the silica powder in a weight proportion of 100:1-10.
Claim 6
Dependent Claim
26 words
The toner composition according to any of claims 1 to 4, wherein the surface-coated silica powder has a particle size of not more than 5 microns.
Claim 7
Dependent Claim
20 words
The toner composition according to any of claims 1 to 5, which is usable for the heat roll fixation method.
Claim 8
Dependent Claim
27 words
The toner composition according to any of claims 2 to 6, wherein the low molecular weight polyolefin is low molecular weight polyethylene or low molecular weight polypropylene.
Claim 9
Dependent Claim
24 words
The toner composition according to any of claims 2 to 7, wherein the electrification-regulating agent is a nigrosine dye or a metal containing dye.
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |