Magnetic recording members
AssigneeFuji Photo Film Co., Ltd.
InventorsYasuyuki Yamada, Kazuhiko Morita, Goro Akashi
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Abstract
Magnetic recording tapes having an excellent durability are obtained by using as a binder for ferromagnetic powders on a base film or sheet an intimate mixture of (1) a vinyl chloride-vinyl acetate copolymer, (2) an organic polyisocyanate and (3) a reactive acrylic resin having a carboxyl group content of from 1 to 30% by weight which will react through the carboxyl groups with the polyisocyanate compound into a crosslinked cured state.
Claims5
A magnetic recording member comprising a support and a coating of a dispersion of a ferromagnetic powder in a binder comprising (1) a copolymer consisting essentially of a vinyl chloride-vinyl acetate copolymer wherein the weight ratio of vinyl chloride to vinyl acetate in the copolymer ranges from 70:30 to 98:2, (2) an organic polyisocyanate compound and (3) a reactive acrylic resin, said resin having a carboxyl group content of from 1 to 30% by weight which is cured through reaction with said organic polyisocyanate compound;
- and wherein said binder comprises said vinyl chloride-vinyl acetate copolymer in a weight ratio to said reactive acrylic resin of 70:30 to 15:85 and said polyisocyanate in an amount from 10 to 40% by weight based on the reactive acrylic.
Dependencies are inferred from the claim text.