| 摘要 |
PURPOSE:To obtain a lipophilic magnetic material to be used in a magnetic offset printing method by consisting said material of a specific polymer and magnetic powder and allowing a chemical bond to exist between the particle surface of the magnetic powder and the polymer molecule. CONSTITUTION:This magnetic material consists of the polymer which is solid at ordinary temp.-60 deg.C, has >=80 deg. contact angle with water and is soluble in a specific solvent and the magnetic powder. The chemical bond exists between the particle surface of the magnetic powder and the polymer molecule of this magnetic material for printing. More specifically, this material is dispersed into the solvent in which the polymer, i.e., the constituting component thereof is soluble and after the material is adhered to the image part on the surface of a magnetic drum, the drum is dried, by which the material can be fixed to the outside surface of the drum. In addition, the material does not wet with water even if the material contacts the damping water after fixing. Since the material has a sufficient property to retain lipophilic ink, the material is usable as the magnetic material even in a magnetic offset printing method. |
