Non-magnetic one-component developer

Assignee: Zeon Corp

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Filing: 1991-01-14

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Granted: —

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Expires: 2011-01-14

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Abstract

Abstract A non-magnetic one-component developer suitable for use in a contact or non-contact development system. The developer comprises 100 parts by weight of colored fine particles, which comprises a binder resin and a colorant, and 0.3-10 parts by weight of at least one fine inorganic powder selected from (i) a fine inorganic powder (I) obtained by subjecting a fine inorganic powder having an average particle size of 0.1-10 µm and a heating loss (under drying conditions of 150°C and 1 hour) of at most 1 wt.% to a hydrophobicity-imparting treatment with a silicone oil and (ii) a fine inorganic powder (II) obtained by subjecting a fine inorganic powder having an average particle size of 0.1-10 µm to a two-step hydrophobicity-imparting treatment with at least one compound selected from silane coupling agents and silazane compounds and then further with a silicone oil.

Inventors

👤 Yoshihiro 2-9-941 Fujisawa Seibu Makuta
👤 Mitsuo Ueno
👤 Minoru C/O Oki Electric Isobe
👤 C/O Oke Electric Industry Co. Ltd. Kikuchi
👤 Katsuyuki C/O Oki Electric Industry Co. Lt Ito

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 05:47

CPC Classifications

G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09716

Claims Analysis

Total Claims: 7

Claim 1

Independent Claim 108 words

A non-magnetic one-component developer comprising: 100 parts by weight of coloured fine particles which comprise a binder resin and a colourant; and 0.3-10 parts by weight of a treated inorganic powder as obtained either (I) by subjecting an inorganic powder having an average particle size of 0.1-10 µm. and a heating loss (under drying conditions of 150°C and 1 hour) of at most 1 wt% to a hydrophobicity-imparting treatment with a silicone oil or (II) by subjecting an inorganic powder having an average particle size of 0.1-10 µm to a two-step hydrophobicity-imparting treatment, first with a silane coupling agent or a silazane, and then with a silicone oil.

Claim 2

Dependent Claim 22 words

A developer as claimed in claim 1, wherein the inorganic powder is selected from silicon dioxide, aluminium silicate, magnesium silicate and alumina.

Claim 3

Dependent Claim 43 words

A developer as claimed in claim 1 or claim 2, wherein the heating loss (under drying conditions of 150°C and 1 hour) of the inorganic powder as obtained by treatment with the silane coupling agent or silazane compound is at most 1 wt%.

Claim 4

Dependent Claim 23 words

A developer as claimed in any preceding claim, wherein the blow-off charge level of the treated inorgaric powder is -50 to -150 µC/g.

Claim 5

Dependent Claim 20 words

A developer as claimed in any preceding claim, wherein the degree of hydrophobicity of the treated inorganic powder is 5-50.

Claim 6

Dependent Claim 95 words

A development system in which a development blade (3) for controlling the layer thickness of a developer (4) is arranged so as to bring it into contact under pressure with the surface of a development roll (2), the developer is evenly applied to the surface of the development roll and the development roll is brought into direct contact with an electrostatic latent image on a photosensitive member (1) or caused to face in a non-contact relation with the latent image, thereby developing the latent image, wherein the developer is as claimed in any preceding claim.

Claim 7

Dependent Claim 21 words

A system as claimed in claim 6, wherein untransferred developer remaining on the photosensitive member after development is recovered and recycled.

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