Method of decreasing unreacted monomer in vinyl polymer and a toner resin in which unreacted monomer has been decreased
US6627681B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2001 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Sep 26, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08702
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The method of decreasing unreacted monomer in vinyl polymer of the present invention is a method comprising adding a water-soluble inorganic salt that is able to solubilize unreacted monomer contained in vinyl polymer to an aqueous dispersion in which particles of vinyl polymer are dispersed in an aqueous medium, followed by solubilizing the unreacted monomer and removing the unreacted monomer together with the aqueous medium. According to this method, the amount of unreacted monomer present in a polymer can be efficiently and reliably decreased at low cost without requiring a special apparatus or thermal energy, etc. In addition, the toner resin of the present invention has for its constituent component a vinyl polymer in which the amount of unreacted monomer has been decreased by the method described above. In addition to solving the problem of a foul odor being generated during toner production and fixation when copying, the vinyl polymer obtained according to the method of the present invention also has superior effects such as contributing to improvement of toner characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.