Two-component developer for developing electrostatic latent image
US-2016282742-A1 · Sep 29, 2016 · US
Two-component developer for electrostatic charge image development
US10698331B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10698331-B2 |
| Application number | US-201916404179-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 6, 2019 |
| Priority date | May 17, 2018 |
| Publication date | Jun 30, 2020 |
| Grant date | Jun 30, 2020 |
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- Title
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Abstract
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To provide a two-component developer for electrostatic charge image development, the two-component developer enabling a high image quality to be kept and enabling the occurrence of fogging to be suppressed even in continuous printing of an image high in coverage rate. The two-component developer for electrostatic charge image development includes a toner particle including a toner base particle and an external additive disposed on the surface of the toner base particle, and a carrier particle including a core material particle and a covering section disposed on the surface of the core material particle, wherein the external additive includes an alumina particle, and the percentage of exposed area of the core material particle is 4.0% or more and 15.0% or less.
First claim
Opening claim text (preview).
What is claimed is: 1. A two-component developer for electrostatic charge image development, comprising: a toner particle comprising a toner base particle and an external additive disposed on a surface of the toner base particle; and a carrier particle comprising a core material particle and a cover disposed on a surface of the core material particle, wherein the external additive comprises an alumina particle, and a percentage of exposed area of the core material particle is 4.0% or more and 8.2% or less. 2. A two-component developer for electrostatic charge image development, comprising: a toner particle comprising a toner base particle and an external additive disposed on a surface of the toner base particle; and a carrier particle comprising a core material particle and a cover disposed on a surface of the core material particle, wherein the external additive comprises an alumina particle, and a shape factor of the core material particle is 130 to 150. 3. The two-component developer for electrostatic charge image development according to claim 1 , wherein a dynamic resistivity of the carrier particle is 1.0×10 8 Ω·cm or more and 1.0×10 11 Ω·cm or less. 4. The two-component developer for electrostatic charge image development according to claim 1 , wherein a volume resistivity of the alumina particle is higher than a dynamic resistivity of the carrier particle. 5. The two-component developer for electrostatic charge image development according to claim 1 , wherein a number average primary particle size of the alumina particle is 10 nm or more and 40 nm or less. 6. The two-component developer for electrostatic charge image development according to claim 1 , wherein the cover comprises a cycloalkyl group-containing resin.
Assignees
Inventors
Classifications
- G03G9/1075Primary
Structural characteristics of the carrier particles, e.g. shape or crystallographic structure · CPC title
Electric parameters · CPC title
characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title
obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
with toner particles · CPC title
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- What does patent US10698331B2 cover?
- To provide a two-component developer for electrostatic charge image development, the two-component developer enabling a high image quality to be kept and enabling the occurrence of fogging to be suppressed even in continuous printing of an image high in coverage rate. The two-component developer for electrostatic charge image development includes a toner particle including a toner base particle…
- Who is the assignee on this patent?
- Konica Minolta Inc
- What technology area does this patent fall under?
- Primary CPC classification G03G9/1075. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jun 30 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).