| 摘要 |
A magnetic layer is overlaid on the front surface of a substrate, and a backing layer is overlaid on the back surface of the substrate. The backing layer is formed by the application of a coating composition, which contains inorganic grains and a binder, to the back surface of the substrate. The coating composition is prepared from the steps of kneading a mixture of the inorganic grains and the binder, in which the weight ratio of the inorganic grains to the binder falls within the range of 100:10 to 100:30, in a two-shaft continuous kneading and mixing machine. A dilution kneading process is then carried out on a mixture of the kneaded mixture, which results from the kneading process, and an organic solvent in a two-shaft continuous kneading and mixing machine. Thereafter a dispersion process is carried out on the diluted mixture, which results from the dilution kneading process.
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