| 摘要 |
<p>PURPOSE:A magnetic ink for magnetic fluid recording providing colorful and stable recording without damaging recording characteristics, obtained by adding a colorant subjected to solubilization and dispersibility treatment to a magnetic fluid prepared by dispersing magnetic particles into a dispersion medium. CONSTITUTION:A colorant subjected to solubilization and dispersibility treatment is added to a magnetic fluid prepared by dispersing magnetic particles, e.g., ferrite, etc. to a dispersion medium (preferably, hydrocarbon, ether, fluorohydrocarbon type) with a surface active agent, to give the desired magnetic ink. Blending of the colorant with oleic acid, acetylation with oleic acid, acylation with linoleic acid, etc. may be cited as the method for treating the colorant. EFFECT:Even being allowed to stand alone for along time, the ink maintains the composition, color tone, electric properties, and magnetic properties of ink.</p> |
