Ube Industries, Inc.

Tadashi Matsunami

Yukio Tasaka

Satoshi Otaka

Kazuo Tsuchiya

Kouji Matsumoto

A fibrous anhydrous magnesium oxysulfate having a rational formula of MgSO.sub.4.5Mg(OH).sub.2 has an excellent oil absorptivity and appropriate hygroscopicity. The fibrous anhydrous magnesium oxysulfate is prepared by a process comprising cooling and diluting, with water or an aqueous solution of magnesium sulfate, a slurry of magnesium oxysulfate having a rational formula of 2MgSO.sub.4.Mg(OH).sub.2.3H.sub.2 O, obtained by dispersing magnesium hydroxide or magnesium oxide into an aqueous solution of magnesium sulfate, and then subjecting the dispersion to hydrothermal reaction, to thereby decompose the 2MgSO.sub.4.Mg(OH).sub.2.3H.sub.2 O and produce fibrous magnesium oxysulfate having a rational formula of MgSO.sub.4.5Mg(OH).sub.2.8H.sub.2), and then heat-treating the fibrous magnesium oxysulfate having the rational formula of MgSO.sub.4.5Mg(OH).sub.2.8H.sub.2 O.

Fibrous anhydrous magnesium oxysulfate and process for the preparation

A thermoplastic resin composition of a thermoplastic resin and a fibrous magnesium oxysulfate is made to be resistant to coloring by incorporation of a boric acid or boric acid anhydride.

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Yamaguchi, Japan

Tadashi Matsunami