Patent ID: 7837291
Filing Date: 2010-11-23
Classification: B41J,C09B,C09D

Abstract:
1. A method of removing an anionic dye/cationic polymer complex from an inkjet printhead, comprising the step of applying to the complex on the printhead a water-soluble solvent having a dielectric constant from 20 to 43 at standard temperature and pressure; wherein an anionic dye in the complex is selected from the group consisting of direct black dyes, phthalocyanine cyan dyes, acid cyan dyes, mixtures of acid cyan and phthalocyanine cyan, gamma acid magenta dyes, xanthene magenta dyes, mixtures of H-acid magenta and xanthene magenta dyes, direct yellow dyes, acid yellow dyes, and mixtures of direct yellow dyes and acid yellow dyes; and wherein a cationic polymer in the complex is selected from the group consisting of polyalkylamines, polyethyleneimines and polyguanadines.