Magnetic recording medium
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsKunitsuna Sasaki, Yoshitaka Yasufuku, Toshiaki Shibue, Kazumasa Matsumoto
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Abstract
A magnetic recording medium is disclosed which comprises a support, and a magnetic layer comprising a specific binder resin, a fatty acid or a fatty acid ester and a magnetic particle. The binder resin comprises a monomer unit of vinyl chloride, a monomer unit having an alkalin metal salt of sulfonic acid or an alkaline salt of phosphoric acid and a monomer unit having an epoxy group. The magnetic recording medium is improved in a dispersibility of magnetic particles, a durability for still picture reproduction, a stability in running and in a S/N ratio of luminance.
Claims11
A magnetic recording medium comprising a support and, provided thereon, a magnetic layer comprising
- (a) copolymer resin comprising a monomer unit of vinyl chloride, a first monomer unit having an alkali metal salt of sulfonic acid or an alkali metal salt of phosphoric acid, a second monomer unit having an epoxy group, and a third monomer unit having a hydroxy group;
- (b) a fatty acid or a fatty acid ester;
- (c) magnetic particles;
- and
- (d) a polyurethane resin;
- said polymer is present in the ratio of from 90 to 10 parts by weight of said copolymer to 100 parts of said copolymer plus said polyurethane.
Dependencies are inferred from the claim text.