| 摘要 |
<p>PURPOSE:To improve electromagnetic transducing characteristics, adhesive strength, durability, etc., at the same time by using a binder which consists of nitrocellulose obtained by substituting a protecting component by a vinyl chloride-vinyl acetate copolymer, polyurethane resin, and epoxy resin at a specific mixing ratio. CONSTITUTION:A base is coated with magnetic paint using a binder which consists of three components i.e. 20-60wt% polyurethane resin, 15-45wt% polyester resin, and 20-50wt% nitrocellulose resin, while a protecting component in the nitorocellulose is substituted by a vinyl chloride-vinyl acetate copolymer. To said binder composite (in hatched area in Fig.), a 8-25wt% curing agent polyisocyanate compound basing on the total of resin components is further added to improve the characteristics of the coating more adequately. Consequently, electromagnetic transducing characteristics, and physical characteristics such as adhesive strength, durability for repetition, etc., are improved at the same time without deteriorating surface smoothness.</p> |
