Patent ID: 6391947
Filing Date: 2002-05-21
Classification: B41J,C09D

Abstract:
An ink containing an aqueous medium, a coloring material, and a water-soluble polymeric compound, the ink being homogenous at a temperature lower than 40Â° C.,wherein the polymeric compound is a homopolymer having as a monomer unit an N-alkyl-substituted acrylamide that provides a lower critical consolute temperature (Tc) to the ink, the lower critical consolute temperature (Tc) causing the ink to separate into two phases, one being the aqueous medium and the other being a solid component, when the ink is heated from a first temperature (T1) to a second temperature (T2), the lower critical consolute temperature (Tc) being between (T1) and (T2), and the lower critical consolute temperature being in a range of from 40 to 100Â° C.