US5093201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefinic resin-coated uneven electrophotographic carrier particles
Assignee: Idemitsu Kosan Co Ltd
•
Filing: 1990-01-12
•
Granted: 1992-03-03
•
Expires: 2010-01-12
Abstract
Abstract The present invention provides a polyolefinic resin-coated carrier having a rough surface and containing a core material in a quantity of 90 or more % by weight. Said resin-coated layer may contain fine particles having a charge-controlling function and/or electrically conductive fine particles as additives.
Inventors
- 👤 Junji Ohtani
- 👤 Junji Machida
- 👤 Kazuo Ota
- 👤 Satoshi Asahi
- 👤 Hiroshi Hayashi
- 👤 Kouichi Matono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:54
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1131; G03G9/1132; G03G9/1133; G03G9/1139; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
A carrier used in a two-component developer for the development of electrostatic latent images comprising; a carrier core material of a magnetic particle and an irregularly shaped coating layer prepared by polymerizing an olefinic monomer on the surface of the carrier core material which is pretreated by catalyst components; said irregularly shaped coating layer having convex portions which are grown on the center of the catalyst component existing on the surface of the carrier core material, and said carrier having 1×10 6- 1×10 14 Ω.cm in resistivity.
Claim 2
Dependent Claim
87 words
A carrier used in a two-component developer for the development of electrostatic latent images comprising; a carrier core material of a magnetic particle and an irregularly shaped coating layer prepared by polymerizing an olefinic monomer on the surface of the carrier core material which is pretreated by catalyst components; said irregularly shaped coating layer having convex portions which are grown on the center of the catalyst component existing on the surface of the carrier core material, and said carrier having 1×10 6- 1×10 14 Ω.cm in resistivity.
Claim 3
Dependent Claim
58 words
A carrier of claim 1, wherein the surface roughness exhibits a shape factor, which is expressed by the following formula, of 130 to 200: S={(outer circumference).sup.2/ area}×{1/(4π)}×100 wherein the outer circumference is a mean value of outer circumferences of projected images of carrier particles and the area is a mean value of projected areas of the carrier particles.
Claim 4
Dependent Claim
17 words
A carrier of claim 1, wherein the carrier core material is 20-100 μm in mean particle size.
Claim 5
Dependent Claim
23 words
A carrier of claim 1, wherein the content of the carrier core material based on the carrier is at least 90% by weight.
Claim 6
Dependent Claim
13 words
A carrier of claim 1, wherein the carrier is 3.5-7.5 in specific gravity.
Claim 7
Dependent Claim
13 words
A carrier of claim 1, wherein the polyolefinic resin is a polyethylene resin.
Claim 8
Dependent Claim
19 words
A carrier of claim 6, wherein the polyethylene resin has 5.0×10 3- 5.0×10 5 in weight average molecular weight.
Claim 9
Dependent Claim
21 words
A carrier of claim 1, further comprising a fine particles having a charge controlling function and/or an electrically conductive fine particles.
Claim 10
Dependent Claim
27 words
A carrier of claim 1, wherein the fine particles having a charge controlling function and/or the electrically conductive fine particles is 0.01-2.0 μm in mean particle size.
Claim 11
Dependent Claim
38 words
A carrier of claim 1, wherein the fine particles having a charge controlling function and/or the electrically conductive fine particles is added at the content of 0.1 wt %-60 wt % on the basis of the olefinic resin.
Claim 12
Dependent Claim
13 words
A carrier of claim 1, wherein the catalyst component comprises titanium and/or zirconium.
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) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |