Charge controlling agent, method for producing the same and toner for developing electrostatic image
US6897000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2001 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Dec 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/097
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for producing a charge controlling agent comprisinig a reaction product of an aromatic hydroxycarboxylic acid and a calcium compound bonded by at least one bondinig system selected from the group consisting of coordinate bonding, covalent bonding and ionic bonding, characterized in that the aromatic hydroxycarboxylic acid and the calcium compound are reacted by dropwise adding a solution of the aromatic hydroxycarboxylic acid to a solution of the calcium compound as a metal-imparting agent, a charge controlling agent produced by said method, which has a shape coefficient (SF-1) average value of at most 250 and a shape coefficient (SF-2) average value of at most 200, and an electrostatic image developing toner containing said charge controlling agent having a presence ratio on a toner surface of at least 2.0 mg/1 g of toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.