Toner for electrophotography
US5324612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Aug 18, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for electrophotography which comprises, as a binder resin, a polyester resin obtained from carboxylic acids containing aromatic monomer in a proportion of 80 mol % or more relative to the entire carboxylic acid component, and alcohols containing aliphatic diols having 2 to 4 carbon atoms in a proportion of 70-100 mol % relative to the entire alcohol component and alicyclic alcohols in a proportion of 0-30 mol % relative to the entire alcohol component, and having a specific gravity of 1.3 or more, a glass transition temperature of 58.degree. C. or more, and a number average molecular weight of 1,000-6,000. The toner of the present invention is superior in image characteristics, fixability, storage stability (resistance to blocking), resistance to plasticizer and charge stability. Therefore, even after a long-term storage of a sheet copied using the toner of the present invention, by keeping same in direct contact with a vinyl chloride transparent sheet or an eraser, transfer of coloring materials and attaching of resin onto the vinyl chloride sheet or the eraser do not occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.