Importance

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Abstract

In a magneto-optic disk, a protective coating is applied to the magnetic recording layer made from a composite comprising minute particles of an inorganic compound, a lubricant and a radical-polymerizable resin. The surfaces of the minute particles of the first type are coated with a surface coating agent which has a lyophilic property with the radical-polymerized resin and this surface coating prevents the minute particles from forming aggregates in the protective coating. Then, the surface of the protective coating becomes smooth. In another type of protective coating, two types of the minute particles are included. The surfaces of the minute particles of the first type are coated with a surface coating agent, while those of the second type remain not coated. Thus, the minute particles of the first kind are not liable to form aggregates in the protective coating, whereas those of the other kind may form aggregates. Although the aggregates decrease the smoothness of the protective coating, they can enhance the amount of the lubricant which can be incorporated in the coating.

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First Claim