Liquid developer for use in electrophotography
US4250241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1979 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Aug 31, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/133
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid developer for use in electrophotography which is prepared by making a carrier liquid comprising a non-aqueous solvent having a highly insulating property and a low dielectric constant contain a coloring agent and a resin dispersed therein, characterized in that said resin contains the following components (A) and (B): PA1 (A) a polymer comprising at least one kind of resin having an acetone tolerance value of 100-5000 and at least one kind of monomer capable of dissolving said resin, and PA1 (B) a non-aqueous type thermoplastic resin obtained by esterifying a copolymer obtained from a monomer having the general formula I ##STR1## [wherein R is --H or --CH.sub.3 and X is --COOC.sub.n H.sub.2n+1 or --OC.sub.n H.sub.2n+1 (6.ltoreq.n.ltoreq.20)], and any one of a monomer having a glycidyl group, an unsaturated carboxylic acid and its anhydride, with said unsaturated carboxylic acid or its anhydride when said copolymer has the glycidyl group as the constitution unit and with the monomer having the glycidyl group when the copolymer has the unsaturated carboxylic acid or its anhydride as the constitution unit; and further graft-polymerizing the unsaturated portion of the resultin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.