Patent ID: 8425029
Filing Date: 2013-04-23
Classification: B41J,B41M,C09D

Abstract:
1. A method of printing a design by means of an ink jet printer using heat activated colorant solids, comprising the steps of: preparing a liquid ink suitable for use in an ink jet printer which uses liquid ink, said liquid ink comprising water, heat activated colorant solids, and a viscosity control agent comprising not less than 15%, or greater than 60%, by weight of the liquid ink, wherein the liquid ink has a viscosity of not less than 6.0 centipoise, wherein the heat activated colorant solids are sparingly soluble in the viscosity control agent, and wherein not less than 95% of particles of heat activated colorant solids have a diameter of 0.05 microns or greater; supplying an ink jet printer that prints liquid ink with said liquid ink; printing said liquid ink in a desired image by means of said ink jet printer on a substrate to form an image, wherein the particles of the heat activated colorant solids are solid at the time of printing; and heat activating the heat activated colorant solids, wherein, after heat activation, the image has an optical density of not less than 1.25 when measured by an X-Rite densitometer.