초록 ▼

A magnetic recording material having superior abrasion resistance and thermal stability is produced by coating a magnetic coating composition consisting essentially of aqueous emulsions of at least two resin binders capable of reacting with each other upon mixing, and being present therein in the se

A magnetic recording material having superior abrasion resistance and thermal stability is produced by coating a magnetic coating composition consisting essentially of aqueous emulsions of at least two resin binders capable of reacting with each other upon mixing, and being present therein in the separated state, and a ferromagnetic powder on a non-magnetic support, drying the coating, and curing the resulting magnetic recording layer where drying is insufficient to effect curing. Hazards ascribable to the use of organic solvents in conventional techniques can be obviated by this invention.

대표청구항 ▼

A process for producing a magnetic recording material, which comprises separately emulsifying in water at least two components capable of reacting with each other upon mixing, to form at least two separate emulsions, combining the resulting emulsions while maintaining said at least two components in

A process for producing a magnetic recording material, which comprises separately emulsifying in water at least two components capable of reacting with each other upon mixing, to form at least two separate emulsions, combining the resulting emulsions while maintaining said at least two components in the separated state, coating a magnetic coating composition consisting essentially of a ferromagnetic fine powder, a binder consisting of said at least two components in said combined emulsion, and a coating liquid on a non-magnetic support, drying the coating to form a magnetic recording layer, and curing the resulting magnetic recording layer if drying is insufficient to effect curing thereof, wherein said at least two components contain reactive groups selected from the group consisting of hydroxyl (－OH), carboxyl (－COOH), epoxy [Figure] carbonyl (C〓O), amino (－NH2), isocyanate (－NCO), or thiocyanate (－NCS), and wherein the molar ratio of reactive groups to react with one another is about 35/65. to 65/35, the amount of binder in the coating composition is 10-70% by weight, as solids content, and is 17-100 parts by weight per 100 parts by weight of the ferromagnetic fine powder.