Patent ID: 6221138
Filing Date: 2001-04-24
Classification: C09D

Abstract:
An ink composition suitable for use in ink jet printing which comprises:a) one or more coloring agents selected from organic and inorganic pigments and dyes,b) a carrier for said coloring agent selected from water, plasticizer alcohols and glycols, andc) at least one magneto-rheological fluid of a size greater than 0.1 .mu.m and a carrier which is soluble or emulsifiable in the carrier for said coloring agent,wherein said ink composition has a viscosity of from 1-100 cps at 25.degree. C. in the absence of an external magnetic field, a higher viscosity when an external magnetic field is applied thereto and comprises sufficient magneto-rheological fluid to render the ink essentially solid at 25.degree. C. when an external magnetic field is applied thereto.