EP0357042A2
Expired / Lapsed
EP
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Composition and method for developing electrostatic latent images
Assignee: TDK Corp
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Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract A composition for developing electrostatic latent images in electrographic printing or copying machinery is provided in which 10% to less than 40% by weight of a carrier having a mean particle diameter of from 10 to 35 µm is blended with a magnetic toner comprising magnetic powder and a resin. Conventional charge control agents, especially metal complexes of azo dyes and Nigrosine dyes should be excluded from the magnetic toner.
Inventors
- 👤 Kazuo C/O Tdk Corporation Aoki
- 👤 Akira C/O Tdk Corporation Kakinuma
- 👤 Megumi C/O Tdk Corporation Saito
- 👤 Motohiko C/O Tdk Corporation Makino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:41
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/083; G03G9/10; G03G9/0819; G03G9/0831
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
An electrostatic latent image developing composition comprising a magnetic toner comprising magnetic particles and a resin, said magnetic toner being free of metal complexes of azo dyes and Nigrosine dyes, and 10% to less than 40% by weight of a carrier having a mean particle diameter of from 10 to 35 µm.
Claim 2
Dependent Claim
52 words
An electrostatic latent image developing composition comprising a magnetic toner comprising magnetic particles and a resin, said magnetic toner being free of metal complexes of azo dyes and Nigrosine dyes, and 10% to less than 40% by weight of a carrier having a mean particle diameter of from 10 to 35 µm.
Claim 3
Dependent Claim
25 words
The developing composition of claim 1 wherein said magnetic toner is in particulate form having a mean particle diameter of from 6 to 25 µm.
Claim 4
Dependent Claim
21 words
The developing composition of claim 1 wherein said magnetic particles have a mean particle diameter of from 0.01 to 10 µm.
Claim 5
Dependent Claim
18 words
The developing composition of claim 1 wherein said magnetic toner comprises at least two types of magnetic particles.
Claim 6
Dependent Claim
87 words
A method for developing an electrostatic latent image using a developing unit including a magnet, a developing sleeve mounted for relative rotation on the magnet, and a photoconductor disposed in proximity to the sleeve and adapted to have a latent image born thereon, comprising the steps of: charging the developing unit with an electrostatic latent image developing composition as set forth in claim 1, and causing relative rotation of the magnet and the developing sleeve, thereby developing the latent image on the photoconductor with the developing composition.
Claim 7
Dependent Claim
13 words
The method of claim 5 which further includes replenishing only the magnetic toner.
References Cited (Backward Citations)
No citation records indexed.
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