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Abstract

By hydrating a metal oxide solid solution shown as the following formula (3), wherein an average primary crystal particle diameter is in the range of 1 to 10 .mu.m, in the presence of monocarboxylic acid and/or oxymonocarboxylic acid in aqueous medium, Mg.sub.1-z M.sup.2+.sub.z O (3) in which M.sup.2+ represents at least one divalent metal ion selected from the group consisting of Mn.sup.2+, Fe.sup.2+, Co.sup.2+, Ni.sup.2+, Cu.sup.2+ and Zn.sup.2+, and z is in the range of 0.01.ltoreq.z<0.5, a metal hydroxide solid solution having a high aspect ratio shown as the following formula (1) can be obtained; Mg.sub.1-x M.sup.2+.sub.x (OH).sub.2 (1) in which M.sup.2+ represents at least one divalent metal ion selected from the group consisting of Mn.sup.2+, Fe.sup.2+, Co.sup.2+, Ni.sup.2+, Cu.sup.2+ and Zn.sup.2+, and x is in the range of 0.01.ltoreq.x<0.5, characterized by that a crystal is a hexagonal plate in shape, 0.01 to 0.5 .mu.m in average thickness, 1 to 10 .mu.m in average diameter and not less than 10 in aspect ratio. The metal hydroxide and oxide solid solutions add new functions such as a reinforcing effect on resin, ductility useful for cosmetics and the like and ultraviolet ray absorbancy to functions available for conventional magnesium based metal hydroxide and oxide solid solutions such as a solutions such as a flame-retardant, an acid neutralizer, an acid acceptor for halogen-containing rubber, a thickener for FRP and the like.

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First Claim