| 摘要 |
PURPOSE:To improve electrical characteristics, above all, resolving power as well as heat resistance and reliability of a coated film by dispersing ferromagnetic powder in a high polymer binder consisting of at least one kind of resin selected from the group consisting of a phenol aralkyl resin and polyvinyl phenol resin as well as an epoxy resin and polyvinyl butyral resin and forming a titled compsn. CONSTITUTION:A high polymer binder is so constituted that at least one kind of resin selected from the group consisting of a phenol aralkyl resin and polyvinyl phenol resin is contained at 25-62wt%, an epoxy resin at 25-62wt% and a polyvinyl butyral resin at 8-22wt%. A paint is required to have good wettability in order to coat a thin film and a linear polymer is preferable as the binder to meet such requirement. The polyvinyl phenol resin B having a linear structure and having the mol.wt. much larger than the mol.wt. of the conventional phenol resin and the phenol aralkyl resin A are used together with the epoxy resin and polyvinyl butyral resin.
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