| 摘要 |
A process of preparing magnetic recording elements containing substantially transparent magnetic recording layer which exhibit excellent magnetic and reproducing characteristics is as follows: (a.) forming a substantially homogeneous dispersion of acicular magnetizable particles in a medium comprising a solution of substantially transparent binder in solvent using particles having an average width of less than about 0.06 micron and an average length up to about 1 micron; the concentration of the binder being at least about 10 parts per 100 parts, by weight, of the particles; up to about 30 parts, by weight, for particles having an average length of at least about 0.06 micron and up to about 40 parts, by weight, for particles having an average length of less than about 0.06 micron, (b.) coating a support with the dispersion in an amount sufficient to provide a final dry layer thickness up to about 5 microns, (c.) removing substantially all solvent from the layer and (d.) treating the layer containing particles in which the average length is at least about 0.06 micron using one or both of the following process steps, (1.) compacting the layer while it is in a malleable state to reduce its thickness, (2.) imbibing into the layer a substantially transparent liquid having a refractive index that is substantially the same as that of the binder.
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