| 发明名称 | Toner and developer | ||
| 摘要 | 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. | ||
| 申请公布号 | US9316938(B2) | 申请公布日期 | 2016.04.19 |
| 申请号 | US201214359429 | 申请日期 | 2012.10.17 |
| 申请人 | Ricoh Company, Ltd. | 发明人 | Watanabe Masaki;Ogawa Satoshi;Kusahara Teruki;Yoshida Ryuta |
| 分类号 | G03G9/087;G03G9/08 | 主分类号 | G03G9/087 |
| 代理机构 | Oblon, McClelland, Maier & Neustadt, L.L.P | 代理人 | Oblon, McClelland, Maier & Neustadt, L.L.P |
| 主权项 | 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. | ||
| 地址 | Tokyo JP | ||