Abstract: A resin composition which comprises 100 parts by weight of a synthetic resin and 50 to 1,500 parts by weight of magnesium oxide particles, wherein the magnesium oxide particles satisfy the following requirements (i) to (v): (i) an average secondary particle diameter of 0.1 to 130 &mgr;m, (ii) a BET method specific surface area of 0.1 to 5 m2/g, (iii) a total content of an Fe compound and an Mn compound of 0.01 wt % or less in terms of metals, (iv) an Na content of 0.001 wt % or less, and (v) a Cl content of 0.005 wt % or less, and a molded product formed therefrom. Since the resin composition of the present invention has excellent flame retardancy, heat conductivity and water resistance, it is advantageously used as a material for sealing a heat generating electronic member such as a semiconductor.

Abstract: A process for the production of a magnesium oxide having high hydrolysis resistance and high fluidity, which comprises:(A) a step of reacting a water-soluble magnesium salt with an alkaline substance in such an amount that is not more than 0.95 equivalent weight based on 1 equivalent weight of the water-soluble magnesium salt, at a temperature of not more than 40.degree. C.,(B) a step of heating the resultant reaction product and its reaction mother liquor at about 50.degree. to 120.degree. C. to form a magnesium hydroxide,(C) a step of forming particles having an average secondary particle diameter of about 5 to 500 .mu.m by using a spray drier,(D) a step of firing the particles at about 1,100.degree. to 1,600.degree. C., and(E) a step of pulverizing the resultant fired product under conditions which do not substantially destroy the average secondary particle diameter obtained in the above step (C).

Abstract: A hydrothermally treated product useful for treating an iron deficiency of a compound having a hydrotalcite-like crystal structure and represented by the following formula (I)(Fe.sup.2+,Mg.sup.2+).sub.x (Al.sup.3+,Fe.sup.3+).sub.2 (OH).sub.2x+6-nz (A.sup.n-).sub.z.mH.sub.2 O (I)wherein A.sup.n- represents an anion having a valence of n, Mg.sup.2+ is within the range of O.ltoreq.Mg.sup.2+ <x, Fe.sup.3+ is within the range of O.ltoreq.Fe.sup.3+ <2, x is a number represented by 1.ltoreq.x<20, z is a number represented by 0<z<3, and m is a number represented by 0.ltoreq.m<20, the product being formed by the thermal treatment of the compound of formula (I) at a temperature of about 100.degree. C. to about 200.degree. C. in an aqueous medium.

Abstract: A composition for treating an iron deficiency disease, composed of (1) an amount, effective for treating said disease, of a compound having a hydrotalcite-like crystal structure and represented by the following formula(Fe.sup.2+,Mg.sup.2+).sub.x (Al.sup.3+,Fe.sup.3+).sub.2 (OH).sub.2x+6-nz (A.sup.n-).sub.z.mH.sub.2 Owherein A.sup.n- represents an anion having a valence of n, Mg.sup.2+ is within the range of O.ltoreq.Mg.sup.2+ <x, Fe.sup.3+ is within the range of O.ltoreq.Fe.sup.3+ 2, x is a number represented by 1.ltoreq..times.<20, z is a number represented by 0<z<3, and m is a number represented by O.ltoreq.m<8, and (2) a pharmaceutically acceptable diluent or carrier, and a method for treating an iron deficiency disease, which comprises orally administering an amount, effective for treating said disease, of the compound represented by the aforesaid formula.