Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, and process cartridge
US-2015220009-A1 · Aug 6, 2015 · US
Toner for electrostatic charge image development
US9933716B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9933716-B2 |
| Application number | US-201615278687-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 28, 2016 |
| Priority date | Jan 15, 2016 |
| Publication date | Apr 3, 2018 |
| Grant date | Apr 3, 2018 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present invention relates to a toner for electrostatic charge image development, including toner base particles containing a binder resin containing as a main component a vinyl resin having a constitutional unit derived from a monomer having an acid group, and aluminum, wherein a concentration of the aluminum in the toner base particles, as measured by radio inductively coupled plasma emission spectral analysis, is from 900 to 2,200 ppm. According to the present invention, there is provided a means for improving the environmental stability of electrification, and the glossiness and the image density of the image to be formed in a good balance while maintaining sufficient low temperature fixability in a toner for electrostatic charge image development.
First claim
Opening claim text (preview).
What is claimed is: 1. A toner for electrostatic charge image development, comprising toner base particles containing a binder resin containing as a main component a vinyl resin having a constitutional unit derived from a monomer having a carboxylic acid group, and aluminum, wherein a concentration of the aluminum in the toner base particles, as measured by radio inductively coupled plasma emission spectral analysis, is from 900 to 2,200 ppm, and a content of the constitutional unit derived from the monomer having the carboxylic acid group is from 3 to 20% by mass, relative to the total constitutional units of the vinyl resin. 2. The toner for electrostatic charge image development according to claim 1 , wherein the monomer having the carboxylic acid group is (meth)acrylic acid. 3. The toner for electrostatic charge image development according to claim 1 , wherein the concentration of the aluminum is from 1,200 to 1,800 ppm. 4. The toner for electrostatic charge image development according to claim 1 , wherein the toner base particles further comprise at least one selected from the group consisting or magnesium, iron, and calcium. 5. The toner for electrostatic charge image development according to claim 1 , wherein the toner base particles have a core-shell structure. 6. The toner for electrostatic charge image development according to claim 1 , further comprising silica particles having a number average primary particle size of from 60 to 150 nm as an external additive. 7. The toner for electrostatic charge image development according to claim 1 , wherein the content of the constitutional unit derived from the monomer having the carboxylic acid group is from 5 to 15% by mass, relative to the total constitutional units of the vinyl resin.
Assignees
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Classifications
obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
- G03G9/08711Primary
with esters of acrylic or methacrylic acid · CPC title
Preparation thereof · CPC title
characterised by physical or chemical properties · CPC title
Polyesters · CPC title
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- What does patent US9933716B2 cover?
- The present invention relates to a toner for electrostatic charge image development, including toner base particles containing a binder resin containing as a main component a vinyl resin having a constitutional unit derived from a monomer having an acid group, and aluminum, wherein a concentration of the aluminum in the toner base particles, as measured by radio inductively coupled plasma emiss…
- Who is the assignee on this patent?
- Konica Minolta Inc
- What technology area does this patent fall under?
- Primary CPC classification G03G9/08711. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Apr 03 2018 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).