Toner and developer
US-8932789-B2 · Jan 13, 2015 · US
Toner and developer
US9316938B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9316938-B2 |
| Application number | US-201214359429-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 17, 2012 |
| Priority date | Nov 21, 2011 |
| Publication date | Apr 19, 2016 |
| Grant date | Apr 19, 2016 |
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Abstract
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A toner including a non-crystalline polyester resin and a crystalline polyester resin, wherein a tetrahydrofuran soluble component of the non-crystalline polyester resin has a weight-average molecular weight of 3,000 to 8,000 measured by gel permeation chromatography, and wherein the toner has a glass transition temperature A before an extraction process of the toner with methanol and a glass transition temperature B after the extraction process of the toner with methanol, and a difference between A and B (B−A) is 2.0° C. or less.
First claim
Opening claim text (preview).
The invention claimed is: 1. A toner, comprising: a non-crystalline polyester resin obtained by polycondensation of an acid component and an alcohol component, the acid component comprising a polycarboxylic acid and the alcohol component comprising both an ethylene oxide 2-mole adduct of bisphenol A and a propylene oxide 2-mole adduct of bisphenol A, and a crystalline polyester resin, wherein a tetrahydrofuran soluble component of the non-crystalline polyester resin has a weight-average molecular weight of from 3,000 to 8,000 measured by gel permeation chromatography, and the toner has a glass transition temperature A before an extraction process of the toner with methanol and a glass transition temperature B after the extraction process of the toner with methanol, and a difference between A and B (B−A) is 2.0° C. or less. 2. The toner according to claim 1 , wherein the acid component comprises a straight-chain polycarboxylic acid having 4 to 8 carbon atoms and an aromatic polycarboxylic acid. 3. The toner according to claim 2 , wherein the acid component comprises said straight-chain polvcarboxylic acid having 4 to 8 carbon atoms, a divalent aromatic carboxylic acid, and a trivalent aromatic carboxylic acid. 4. The toner according to claim 1 , wherein the non-crystalline polyester resin has a peak area ratio (OH/COOH) derived from the alcohol component and the acid component measured by 1 H-NMR when the non-crystalline polyester resin is dissolved in deuterated chloroform of 1.30 to 1.50. 5. The toner according to claim 1 , wherein the non-crystalline polyester resin has a glass transition temperature of from 30° C. to 60° C. in a second temperature increase of differential scanning calorimetry measurement where the temperature is elevated to 150° C. at a heating rate of 10° C/min. 6. The toner according to claim 1 , wherein the crystalline polyester resin is obtained from a polycarboxylic acid component and a polyhydric alcohol component. 7. A developer, comprising a carrier and the toner according to claim 1 .
Assignees
Inventors
Classifications
characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title
Separation; Classifying · CPC title
Post-treatment · CPC title
- G03G9/08755Primary
Polyesters · CPC title
whereby chemical synthesis of at least one of the toner components takes place · CPC title
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Frequently asked questions
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- What does patent US9316938B2 cover?
- A toner including a non-crystalline polyester resin and a crystalline polyester resin, wherein a tetrahydrofuran soluble component of the non-crystalline polyester resin has a weight-average molecular weight of 3,000 to 8,000 measured by gel permeation chromatography, and wherein the toner has a glass transition temperature A before an extraction process of the toner with methanol and a glass t…
- Who is the assignee on this patent?
- Watanabe Masaki, Ogawa Satoshi, Kusahara Teruki, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification G03G9/08755. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Apr 19 2016 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).