Coated magnetic toner powder
US4530894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1984 |
| Grant date | Jul 23, 1985 |
| Priority date | — |
| Expiry date | Apr 20, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2995
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic toner comprises magnetic powder and a coating layer to cover said powder, the layer being a reaction product between (1) a silane coupling agent containing an amino group, an isocyanate group or an epoxy group and (2) one or more compounds having a functional group reactive with one of the reactive group on the silane coupling agent. A compound having a carboxyl group, an acid anhydride, an isocyanate compound or a ketene dimer is used for the amino group. A compound having a hydroxyl group, an amine compound or a compound having a carboxyl group is used for the isocyanate group. A compound having a hydroxyl group, a compound having a carboxyl group or a copolymer of a di- or monoalkylamino-alkyl (meth)acrylate and a hydrophobic vinyl monomer is used for the epoxy group. The magnetic toner is improved about dispersibility in a binder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.