Particulate Magnetic Coatings
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
When preparing a magnetic ink for use in coating a non-magnetic substrate to form magnetic recording media, CrO(2) particles first mixed with an isocyanate crosslinking agent, such as the MONDUR* MRS brand. During this mixing process, the isocyanate functions as a dispersing agent, and also stabilizes the CrO(2) particles against change in magnetic property as a function of humidity. After this mixing step, urethane polymer is added as the final constituent of the ink. The ink is then coated on the substrate.