Liquid developer for developing electrostatic image and image forming method
US6447973B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid developer containing a carrier liquid containing silicone oil, and toner particles dispersed in the carrier liquid and each containing a coloring agent and a resin, the resin contains at least one member selected from the group consisting of the following resins (a)-(g):(a): rosin polymers having a softening point of 50-190° C., a glass transition point of 10-170° C. and a molecular weight of 2,000-40,000 and obtained by reacting(a1) a rosin glycidyl ester,(a2) dicarboxylic acid or dicarboxylic anhydride,(a3) at least one crosslinking agent selected from the group consisting of polyfunctional epoxy compounds, tri- or more polybasic acids or anhydrides thereof tri- or more polyhydric alcohols, and(a4) a dihydric alcohol;(b): vinyl polymers having a ratio of the weight average molecular weight to the number average molecular weight of greater than 4;(c): olefin resins having a melt index of 2.5-700;(d): polyolefins or polyolefin copolymers having an acid value of 0.5-80 and a melt viscosity of 50-20,000 mpa·s at 200° C.;(e): polymers obtained by crosslinking carboxyl group-containing vinyl polymers with an amine;(f): vinyl polymers having at least 0.005% b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.