Patent ID: 6811598
Filing Date: 2004-11-02
Classification: C09D

Abstract:
An ink composition comprising: a liquid medium; an array of encapsulating particles contained in the liquid medium with respective encapsulating particles including one or more pigment particles; the pigment particles being predominately less than 0.3 microns and the encapsulating particles being predominately in the range of 0.1 to 1.0 microns; wherein the encapsulating particles are predominately of a density of 0.9-1.1 g/cc such that the encapsulating particles are predominately neutral buoyant with respect to the liquid medium; and wherein the encapsulating particles include an outer matrix formed of a material that is substantially insoluble in water, has a density less than 1.0 g/cc, and a melting point of less than 100Â° C. and wherein the material forming the matrix is a low density, low molecular weight polymer and is a natural or synthetic wax.