Magnetic recording medium
AssigneeTDK Electronics Co., Ltd.
InventorsAkihiko Hosaka, Kiyotaka Okuyama
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Abstract
A magnetic recording medium is provided which satisfies electromagnetic conversion characteristics and typical physical properties such as bonding strength, repeated-passage stability, still-playback characteristics, etc. without unfavorably affecting the surface smoothness. The binder in the magnetic coating contains in combination specific proportions of three components, a polyurethane resin, an epoxy resin, and a nitrocellulose whose protective ingredient has been replaced by a vinyl chloride-vinyl acetate copolymer is used as a resin binder in magnetic coating material together with a polyisocyanate curing agent.
Claims7
A magnetic recording medium comprising a magnetic coating material coated on a base material, said coating material comprising powdered magnetic material dispersed in a ternary binder composition containing from 30 to 70% by weight of a polyurethane resin, from 10 to 40% by weight of an epoxy resin and from 10 to 50% by weight of replaced nitrocellulose, containing vinyl chloride-vinyl acetate copolymer, together with a polyisocyanate curing agent.
Dependencies are inferred from the claim text.