| http://www.w3.org/ns/prov#value | - In addition to the above ones, for example, use can be made of a metal hydrate obtained by surface-treating magnesium hydroxide or aluminum hydroxide part of whose surface is pretreated previously with an aliphatic acid, a phosphate, or the like, with a silane coupling agent having a functional group, such as a vinyl group and an epoxy group, at the terminal.
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