Toner
US-2019332027-A1 · Oct 31, 2019 · US
Toner
US11112714B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11112714-B2 |
| Application number | US-202016808782-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 4, 2020 |
| Priority date | Mar 14, 2019 |
| Publication date | Sep 7, 2021 |
| Grant date | Sep 7, 2021 |
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Abstract
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A toner comprising: a toner particle; and an external additive, wherein the external additive includes spherical silica particles and hydrotalcite particles, a number average particle diameter Da of the spherical silica particles is from 10 nm to 40 nm, a circularity of the spherical silica particles is at least 0.80, and the toner satisfies formula (1) below:{Ga×(1−Ka/100)}/{Gb×(1−Kb/100)}≥0.050 (1)wherein Ga: a content of the spherical silica particles with respect to 100 parts by mass of the toner particle; Gb: a content of the hydrotalcite particles with respect to 100 parts by mass of the toner particle; Ka: a fixing ratio (%) of the spherical silica particles on a surface of the toner particle; and Kb: a fixing ratio (%) of the hydrotalcite particles on the surface of the toner particle.
First claim
Opening claim text (preview).
What is claimed is: 1. A toner, comprising: a toner particle; and an external additive comprising spherical silica particles having a circularity of at least 0.80 and hydrotalcite particles, wherein a ratio Db/Da of a number average particle diameter Db (nm) of the hydrotalcite particles to a number average particle diameter Da (nm) of the spherical silica particles is 7.5 to 30.0, the number average particle diameter Da (nm) of the spherical silica particles is 10 to 40, and { Ga ×(1− Ka/ 100)}/{ Gb ×(1− Kb/ 100))≥0.050 where Ga is a content of the spherical silica particles with respect to 100 parts by mass of the toner particle, Gb is a content of the hydrotalcite particles with respect to 100 parts by mass of the toner particle, Ka is a fixing ratio (%) of the spherical silica particles on a surface of the toner particle and Kb is a fixing ratio (%) of the hydrotalcite particles on the surface of the toner particle. 2. The toner according to claim 1 , wherein 6.000≥{ Ga ×(1− Ka/ 100)}/( Gb ×(1− Kb/ 100)}≥0.050. 3. The toner according to claim 1 , wherein Ka is 60 to 95. 4. The toner according to claim 1 , wherein Kb is 15 to 70. 5. The toner according to claim 1 , wherein Db is 100 to 1000 nm. 6. The toner according to claim 1 , wherein the content of the spherical silica particles is 0.10 to 5.00 parts by mass with respect to 100 parts by mass of the toner particle. 7. The toner according to claim 1 , wherein the content of the hydrotalcite particles is 0.05 to 1.00 parts by mass with respect to 100 parts by mass of the toner particle. 8. The toner according to claim 1 , wherein the toner particle is an emulsion aggregation toner particle. 9. The toner according to claim 1 , wherein the spherical silica particles are sol-gel silica particles.
Assignees
Inventors
Classifications
Inorganic compounds · CPC title
characterised by carrier particles · CPC title
- G03G9/09725Primary
Silicon-oxides; Silicates · CPC title
characterised by their shape, e.g. degree of sphericity · CPC title
- G03G9/0819Primary
characterised by the dimensions of the particles · CPC title
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- What does patent US11112714B2 cover?
- A toner comprising: a toner particle; and an external additive, wherein the external additive includes spherical silica particles and hydrotalcite particles, a number average particle diameter Da of the spherical silica particles is from 10 nm to 40 nm, a circularity of the spherical silica particles is at least 0.80, and the toner satisfies formula (1) below:{Ga×(1−Ka/100)}/{Gb×(1−Kb/100)}≥0.0…
- 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 Sep 07 2021 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).