Method for producing liquid developer
US10423084B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2018 |
| Grant date | Sep 24, 2019 |
| Priority date | — |
| Expiry date | Nov 14, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for producing a liquid developer, the method including a step of producing a toner particle by applying a shear force to a mixture of a polyester resin A and B, and a toner particle dispersing agent in a liquid a, wherein the polyester resin A has a number-average molecular weight from 3,000 to 7,000, an acid value of at least 5, and a carboxy group; the polyester resin B has a number-average molecular weight from 4,000 to 20,000 and an acid value of not more than 2; the toner particle dispersing agent has a primary amino group and an amine value of at least 40; the mass ratio (B/(A+B)) for the polyester resin B is 0.3 to 0.9; and the following relationship is satisfied: SP value of liquid a<SP value of the toner particle dispersing agent<SP value of polyester resin B.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.