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US 9,316,938 B2Granted
Toner and developer
AssigneeRicoh Company, Ltd.
InventorsMasaki Watanabe, Satoshi Ogawa, Teruki Kusahara, Ryuta Yoshida
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Abstract
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.
Claims7
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 more elements
Dependencies are inferred from the claim text.