| 摘要 |
PURPOSE:To improve the resistance of a magnetic layer to wear and heat by adding octylic acid salt and urethanated tertiary amine to a magnetic coating contg. an isocyanate compd. and applying said coating on a base body thereby forming a magnetic layer. CONSTITUTION:A magnetic coating contg. octylic acid salt, urethanated tertiary amine, isocyanate compd. and magnetic powder is coated on a base body. When the octylic acid salt and urethanated tertiary amine are added into the magnetic coating contg. the isocyanate compd., the crosslinking reaction between the isocyanate compd. and a binder resin such as a vinyl chloride resin, polyester resin, polyurethane resin or the like having active hydrogen is accelerated and these compd. and resin are quickly crosslinked like network, by which the strength of the magnetic layer is improved and the resistance to wear and heat is improved. The amount of the octylic acid salt and the urethanated tertiary amine to be used is preferably in a range of 0.1-10wt% by the total weight of the binder component. The compounding ratio of the octylic acid and the urethanated tertiary amine is made preferably in a range of 1:9-9:1 by weight. |
