Color toner for developing electrostatic image comprising two kinds of polyesters and two kinds of releasing agents
US6541173B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | May 31, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08755
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provide a toner comprising:a coloring agent;a binder resin comprising a first binder resin and a second binder resin, the first binder resin being composed of a linear polyester resin having a number-average molecular weight (Mn) of from 2,500 to 7,000, a weight-average molecular weight (Mw) of from 8,000 to 25,000, and a Mw/Mn ratio of 2 to 4, the second binder resin being composed of a non-linear polyester resin having a number-average molecular weight (Mn) of from 3,500 to 11,000, a weight-average molecular weight (Mw) of from 40,000 to 250,000, and a Mw/Mn ratio of 10 to 35, and a ratio of the first binder resin to the second binder resin (the first binder resin:the second binder resin) being 15:85 to 85:15 by weight,a first releasing agent having a softening point of 55 to 110° C., anda second releasing agent having a softening point of 110 to 160° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.