Oxidized mixed cyclic phenol sulfides, and charge control agents and toners using the same
US7709172B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2008 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Oct 10, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08771
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention discloses an oxidized mixed cyclic phenol sulfide which is a mixture of the oxidized cyclic phenol sulfide wherein m is 8 and the oxidized cyclic phenol sulfide wherein m is an integer other than 8, the oxidized cyclic phenol sulfide being represented by the following formula (1):wherein R is a straight or branched alkyl group having 1 to 6 carbon atoms, m is an integer from 4 to 9, and n is 1 or 2; or an oxidized cyclic phenol sulfide of formula (1) wherein m is 8. The present invention also discloses a charge control agent which comprises the above sulfide(s) as the active ingredient; and a toner which comprises the charge control agent, a coloring agent and a binder resin. This charge control agent is particularly useful for color toners, and it speeds up charging risetime, and has a high charge amount and charging characteristics excellent in environmental stability. Further, the charge control agent is safe since it does not have any problem with the waste regulations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.