Kyowa Chemical Industry Co., Ltd.

Yuya Hamamoto

Shigeo Miyata

Daisuke Kudo

[Problem] To provide a magnesium hydroxide-based solid solution which has smaller primary particles and secondary particles and improved reactivity with an acid as compared with conventional magnesium hydroxide (Mg(OH)), improves the flame retardancy and mechanical strength of a resin, and also forms a non-sedimenting slurry, providing the same handleability as a liquid. [Structure] A magnesium hydroxide-based solid solution represented by the following formula (1): Mg(OH)R(Formula 1), wherein R represents a monovalent organic acid, and x represents 0&#x3c;x&#x3c;1. The magnesium hydroxide-based solid solution is a magnesium oxide (MgO) precursor. A flame retardant for a synthetic resin, including the magnesium hydroxide-based solid solution as an active ingredient. A synthetic resin composition characterized by including 0.1 to 50 parts by weight of the magnesium hydroxide-based solid solution (b) per 100 parts by weight of a synthetic resin (a); and a molded article thereof.

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Sakaide, Japan

Yuya Hamamoto