Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus
US-11906928-B2 · Feb 20, 2024 · US
Process for producing a toner
US9846379B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9846379-B2 |
| Application number | US-201615370134-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 6, 2016 |
| Priority date | Dec 14, 2015 |
| Publication date | Dec 19, 2017 |
| Grant date | Dec 19, 2017 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The production process of the present invention includes: a first step of heating a dispersion containing an aqueous medium and a binder resin containing a crystalline resin to a temperature higher than or equal to the melting point of the crystalline resin in a step of aggregating and fusing a fine particle of the binder resin containing the crystalline resin to produce a toner base particle; a second step of cooling the dispersion having been heated in the first step and having a temperature higher than the recrystallization temperature Rc of the crystalline resin to a temperature lower than Rc at a temperature-lowering rate of 1° C./min or higher; and a third step of maintaining the dispersion having been cooled in the second step at a temperature higher than or equal to Rc−25° C. and lower than or equal to Rc−5° C. for 30 minutes or longer.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for producing a toner comprising: a first step of heating a dispersion containing an aqueous medium and a binder resin containing a crystalline resin to a temperature higher than or equal to a melting point of the crystalline resin in a step of aggregating and fusing a fine particle of the binder resin containing the crystalline resin to produce a toner base particle; a second step of cooling the dispersion having been heated in the first step and having a temperature higher than a recrystallization temperature Rc of the crystalline resin to a temperature lower than the Rc at a temperature-lowering rate of 1° C./min or higher; and a third step of maintaining the dispersion having been cooled in the second step at a temperature higher than or equal to the Rc−25° C. and lower than or equal to the Rc−5° C. for 30 minutes or longer. 2. The process for producing a toner according to claim 1 , wherein, in the third step, the temperature of the dispersion is maintained at a temperature higher than or equal to the Rc−25° C. and lower than or equal to the Rc−10° C. for 30 minutes or longer. 3. The process for producing a toner according to claim 1 , wherein, in the second step, the dispersion is cooled to a temperature lower than the Rc−25° C. 4. The process for producing a toner according to claim 1 , wherein, in the second step, a cooling rate for the dispersion is 2° C./min or higher. 5. The process for producing a toner according to claim 1 , wherein the crystalline resin is a crystalline polyester resin.
Assignees
Inventors
Classifications
characterised by the dimensions of the particles · CPC title
obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
- G03G9/0804Primary
whereby the components are brought together in a liquid dispersing medium · CPC title
Polyesters · CPC title
Preparation thereof · CPC title
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Frequently asked questions
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- What does patent US9846379B2 cover?
- The production process of the present invention includes: a first step of heating a dispersion containing an aqueous medium and a binder resin containing a crystalline resin to a temperature higher than or equal to the melting point of the crystalline resin in a step of aggregating and fusing a fine particle of the binder resin containing the crystalline resin to produce 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 G03G9/0804. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Dec 19 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).