Carrier for two-component developer, two-component developer, and method of preparing carrier for two-component developer
US-2017277054-A1 · Sep 28, 2017 · US
Electrostatic latent image developer and method for producing electrostatic latent image developer
US10409189B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10409189-B2 |
| Application number | US-201715799354-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 31, 2017 |
| Priority date | Nov 22, 2016 |
| Publication date | Sep 10, 2019 |
| Grant date | Sep 10, 2019 |
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- Title
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Abstract
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The disclosure concerns an electrostatic latent image developer including: a toner having toner base particles and an external additive; and a carrier, wherein the external additive contains silicone oil-treated silica and titanium oxide, Net intensity of titanium (Ti) in the toner to be measured by X-ray fluorescence analysis is 0.5 to 5 kcps, the carrier has a resin coating layer coating core material particles, and the resin coating layer has a constituent unit formed from an alicyclic (meth)acrylic acid ester.
First claim
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What is claimed is: 1. An electrostatic latent image developer comprising: a toner having toner base particles and an external additive; and a carrier, wherein the external additive contains silicone oil-treated silica and titanium oxide, and a number average primary particle size of the silicone oil-treated silica is 20 to 200 nm, Net intensity of titanium (Ti) in the toner to be measured by X-ray fluorescence analysis is 0.5 to 5 kcps, the carrier comprises a core material particle and a resin coating layer coating the core material particle, and the resin coating layer consists of a resin having a constituent unit formed from an alicyclic (meth)acrylic acid ester and optionally at least one of charge controlling particles or electroconductive particles. 2. The electrostatic latent image developer according to claim 1 , wherein an average aspect ratio to be calculated from a ratio of a number average major axis diameter to a number average minor axis diameter of the titanium oxide is 2 to 15. 3. The electrostatic latent image developer according to claim 1 , wherein a ratio of the Net intensity of titanium (Ti) to Net intensity of silicon (Si) in the toner to be measured by X-ray fluorescence analysis (Net intensity of titanium (Ti)/Net intensity of silicon (Si)) is less than 0.13. 4. The electrostatic latent image developer according to claim 1 , wherein the toner base particles include a crystalline resin. 5. A method for producing an electrostatic latent image developer, comprising: mixing toner base particles, silicone oil-treated silica, and titanium oxide; and further mixing a carrier, wherein a number average primary particle size of the silicone oil-treated silica is 20 to 200 nm, an added amount of the titanium oxide with respect to 100 parts by mass of the toner base particles is 0.008 to 0.085 parts by mass, and the carrier comprises a core material particle and a resin coating layer coating the core material particle, and the resin coating layer consists of a resin having a constituent unit formed from an alicyclic (meth)acrylic acid ester and optionally at least one of charge controlling particles or electroconductive particles. 6. The method for producing an electrostatic latent image developer according to claim 5 , wherein an average aspect ratio to be calculated from a ratio of a number average major axis diameter to a number average minor axis diameter of the titanium oxide is 2 to 15. 7. The method for producing an electrostatic latent image developer according to claim 5 , wherein a mass ratio of the titanium oxide added with respect to the silicone oil-treated silica is 0.008 to 0.085. 8. The method for producing an electrostatic latent image developer according to claim 5 , wherein the toner base particles include a crystalline resin. 9. An electrostatic latent image developer comprising: a toner having toner base particles and an external additive; and a carrier, wherein the external additive contains silicone oil-treated silica and titanium oxide, and an average aspect ratio to be calculated from a ratio of a number average major axis diameter to a number average minor axis diameter of the titanium oxide is 2 to 15, Net intensity of titanium (Ti) in the toner to be measured by X-ray fluorescence analysis is 0.5 to 5 kcps, the carrier comprises a core material particle and a resin coating layer coating the core material particle, and the resin coating layer consists of a resin having a constituent unit formed from an alicyclic (meth)acrylic acid ester and optionally at least one of charge controlling particles or electroconductive particles.
Assignees
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Classifications
Inorganic compounds · CPC title
Preparation thereof · CPC title
Silicon-oxides; Silicates · CPC title
characterised by physical parameters (magnetic parameters G03G9/083) · CPC title
- G03G9/1133Primary
obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
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- What does patent US10409189B2 cover?
- The disclosure concerns an electrostatic latent image developer including: a toner having toner base particles and an external additive; and a carrier, wherein the external additive contains silicone oil-treated silica and titanium oxide, Net intensity of titanium (Ti) in the toner to be measured by X-ray fluorescence analysis is 0.5 to 5 kcps, the carrier has a resin coating layer coating core…
- Who is the assignee on this patent?
- Konica Minolta Inc
- What technology area does this patent fall under?
- Primary CPC classification G03G9/1133. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Sep 10 2019 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).