PRODUCTION OF MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To obtain a magnetic recording medium having excellent dispersibility of magnetic powder by adding a higher fatty acid as an additive to magnetic powder in a stage for mixing and dispersing simultaneously the magnetic powder and binder the adding an alkyl sulfocarboxylate thereto in a stage for final viscosity adjustment. CONSTITUTION:The effective dispersion is attained by adding the higher fatty acid having 12-18C as the dispersant to the magnetic powder in the stage of simultaneous addition of the magnetic powder then adding the alkyl sulfocarboxylate thereto in the stage for the final viscosity adjustment. The higher fatty acid having 12-18C may be incorporated preferably at 1.0-2.0pts. wt. by the weight of the magnetic powder and is exemplified by a satd. fatty acid such as lauric acid. The alkyl sulfocarboxylate may be incorporated at 0.5-4.0pts.wt. by the weight of the magnetic powder and is exemplified by sodium di-2-ethyl hexylsulfosuccinate.