Positively chargeable toner
US-2018275542-A1 · Sep 27, 2018 · US
External additive for toner, and toner
US12468236B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12468236-B2 |
| Application number | US-202217808750-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 24, 2022 |
| Priority date | Jul 2, 2021 |
| Publication date | Nov 11, 2025 |
| Grant date | Nov 11, 2025 |
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Abstract
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An external additive for a toner comprising a silica particle surface-treated with a polyhydric acid metal salt particle, wherein the polyhydric acid metal salt particle is particle of a salt of a polyhydric acid and a titanium compound, and a toner comprising a toner particle, and an external additive for a toner on the surface of the toner particle, wherein the external additive for a toner is the above external additive for a toner.
First claim
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What is claimed is: 1 . An external additive for a toner, comprising: a silica particle surface-treated with a polyhydric acid metal salt particle, wherein the polyhydric acid metal salt particle is a particle of a titanium phosphate compound or a titanium carbonate compound, and the external additive has a relative dielectric constant of 2.10 to 2.20 at the frequency at which a dielectric loss tangent tan δ is minimum in a sweep frequency range of 1 MHz to 0.01 Hz. 2 . The external additive for a toner according to claim 1 , wherein the polyhydric acid metal salt particle is present in the silica particle at a content of 0.01 to 1.00 mass %. 3 . The external additive for a toner according to claim 1 , wherein the polyhydric acid is phosphoric acid. 4 . The external additive for a toner according to claim 1 , wherein the silica particle has a number-average particle diameter of 10 to 500 nm. 5 . The external additive for a toner according to claim 1 , wherein the silica particle is sol-gel silica particle. 6 . A toner, comprising: a toner particle; and an external additive on the surface of the toner particle, wherein the external additive is the external additive for a toner according to claim 1 .
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Classifications
characterised by the dimensions of the particles · CPC title
- G03G9/09725Primary
Silicon-oxides; Silicates · CPC title
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- What does patent US12468236B2 cover?
- An external additive for a toner comprising a silica particle surface-treated with a polyhydric acid metal salt particle, wherein the polyhydric acid metal salt particle is particle of a salt of a polyhydric acid and a titanium compound, and a toner comprising a toner particle, and an external additive for a toner on the surface of the toner particle, wherein the external additive for a toner i…
- Who is the assignee on this patent?
- Canon Kk
- What technology area does this patent fall under?
- Primary CPC classification G03G9/09725. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 11 2025 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 12 related publications on this page (citations in our corpus or others sharing the same primary CPC).