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Magnetic recording medium
| Details |
Inventors: Nishimatsu, Masaharu; Ide, Toshiaki; Arioka, Hiroyuki; Kubota, Yuichi;
Assignee: TDK Corporation (Tokyo, JP)
Primary Examiner: Robinson; Ellis P.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
A magnetic recording medium comprising a plastic base film, a thin magnetic metal layer formed on one side of the base film and a backing layer formed on the other side of the base film, characterized in that the backing layer is composed essentially of a thermoset or radiation-cured resin and carbon black and inorganic compound powder uniformly dispersed in the resin, and has a surface roughness of from 0.05 to 0.4 .mu.m, said carbon black having an average particle size of from 10 to 150 m.mu.m as measured by an electron microscope, said inorganic compound powder having a Mohs hardness of at most 6 and a particle size of from 10 to 500 m.mu.m, and the ratio of the carbon black to the inorganic compound powder being from 1:9 to 9:1. |
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DETAILED DESCRIPTION OF THE INVENTION In the present invention, the backing layer formed on the rear side of a thin base film such as a polyester base film, is generally classified into two types, i.
e.
one type being a thermosetting resin composition, and the other type being a radiation curable (or ionizable) resin composition which will be described hereinafter.
It has been found that as the thermosetting resin composition to be used for the backing layer, a thermosetting binder comprising a vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a polyurethane prepolymer and a polyisocyanate or a thermosetting binder comprising such components and nitrocellulose, and containing carbon black and inorganic compound powder, exhibits an excellent thermosetting property.
The radiation curable resin composition to be used for the backing layer is a resin binder composed essentially of a radiation sensitive resin having radiation curable double bonds such as acrylic, maleic or allyl-type double bonds, and containing carbon black and inorganic compound powder.
The carbon black to be used in the present invention, is selected from those having an average particle size of from 10 to 150 m.
mu.
m.
If the average particle size is less than 10 m.
mu.
m, the carbon black tends to be locally concentrated, and the backing layer surface tends to be roughened and is likely to give adverse effects to the magnetic layer which is in contact therewith.
Further, the electroconductivity tends to be poor, whereby a greater amount will be required.
On the other hand, if the average particle size exceeds 150 m.
mu.
m, the problem of the abrasion of the backing layer surface tends to be pronounced although the electroconductivity will be improved, and the abraded particles are likely to deposit on the magnetic layer surface, thus leading to dropouts.
According to the present invention the problem of the brittleness of the carbon black can completely be overcome by using an inorganic compound powder having a Mohs hardness of at most 6
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Manufacturing Materials 
