Abstract: An agent for treating ulcer containing, as an effective component, a particulate composite hydrotalcite obtained by solidly dissolving a small amount of zinc in the particulate hydrotalcite, exhibiting excellent effect for treating the peptic ulcer and, further, working as a Zn-supplying agent. The agent for treating the ulcer is represented by the following formula (1), (MgaZnb)1-xAlx(OH)2(An?)x/n.mH2O??(1) wherein An? is CO32?, SO42? or Cl?, n is 1 or 2, and x, a, b and m are values that satisfy the following conditions, 0.18?x?0.4, 0.1?a<1, 0<b?0.5, 0?m<1.

Abstract: A novel particulate composite hydrotalcite which offers antacidic effect comparable to that of a particulate hydrotalcite so far used as a gastric antacid and, further, offers excellent stomach inner wall protection effect. A particulate composite hydrotalcite represented by the following formula (1), (MgaZnb)1-xAlx(OH)2(An?)x/n.mH2O??(1) wherein An? is CO32?, SO42? or Cl?, n is 1 or 2, and x, a, b and m are values that satisfy the following conditions, 0.18?x?0.4, 0.5?a<1, 0<b?0.5, 0?m<1, and a gastric antacid using the particulate composite hydrotalcite as an effective component. When used as a gastric antacid, the particulate composite hydrotalcite suppresses the occurrence of damage in the mucous membranes of stomach and intestines.

Abstract: An agent for treating ulcer containing, as an effective component, a particulate composite hydrotalcite obtained by solidly dissolving a small amount of zinc in the particulate hydrotalcite, exhibiting excellent effect for treating the peptic ulcer and, further, working as a Zn-supplying agent. The agent for treating the ulcer is represented by the following formula (1), (MgaZnb)1-xAlx(OH)2(An?)x/n.mH2O??(1) wherein An? is CO32?, SO42? or Cl?, n is 1 or 2, and x, a, b and m are values that satisfy the following conditions, 0.18?x?0.4, 0.1?a<1, 0<b?0.5, 0?m<1.

Abstract: A laxative agent comprising composite magnesium oxide particles represented by the following formula (1) as an effective component: (Mg2+)1-x(Zn2+)xO??(1) (x is 0.0001 to 0.3). The laxative agent is excellent in the effect of protecting the mucosa of a digestive organ.

Abstract: A novel particulate composite hydrotalcite which offers antacidic effect comparable to that of a particulate hydrotalcite so far used as a gastric antacid and, further, offers excellent stomach inner wall protection effect. A particulate composite hydrotalcite represented by the following formula (1), (MgaZnb)1-xAlx(OH)2(An?)x/n·mH2O??(1) wherein An? is CO32?, SO42? or Cl?, n is 1 or 2, and x, a, b and m are values that satisfy the following conditions, 0.18?x?0.4, 0.5?a<1, 0<b?0.5, 0?m?1, and a gastric antacid using the particulate composite hydrotalcite as an effective component. When used as a gastric antacid, the particulate composite hydrotalcite suppresses the occurrence of damage in the mucous membranes of stomach and intestines.

Abstract: A synthetic resin composition having heat deterioration resistance comprising: (A) 100 parts by weight of a synthetic resin; and (B) 0.001 to 10 parts by weight of hydrotalcite particles defined by the following (i) to (iv): (i) the hydrotalcite particles are represented by the following chemical structure formula (1): {(Mg)y(Zn)z}1−x(Al)x(OH)2(An−)x/n.mH2O  (1); (ii) the hydrotalcite particles have an average secondary particle diameter of 2 &mgr;m or less; (iii) the hydrotalcite particles have a specific surface area (measured by a BET method) of 1 to 30 m2/g; and (iv) the hydrotalcite particles contain an iron compound and a manganese compound in a total amount of 0.02 wt % or less in terms of metals (Fe+Mn). A molded article formed from the above resin composition of the present invention is excellent in heat deterioration resistance and impact resistance and satisfactory in the dispersibility of hydrotalcite particles.

Abstract: There are provided a flame retardant comprising hydrotalcite compound particles which exhibits excellent heat deterioration resistance when it is used as a flame retardant for resins, a resin composition comprising the same and a molded article thereof. There are also provided a heat deterioration resistant flame retardant comprising hydrotalcite compound particles which (i) have an average secondary particle diameter, measured by a laser diffraction scattering method, of 2 &mgr;m or less and (ii) contain an iron compound and a manganese compound in a total amount of 0.02 wt % or less in terms of metals, a synthetic resin composition comprising the same and a molded article thereof.

Abstract: A flame retardant resin composition comprising (A) 100 parts by weight of a synthetic resin, (B) 20 to 150 parts by weight of magnesium hydroxide particles and (C) 20 to 150 parts by weight of aluminum hydroxide particles, wherein the magnesium hydroxide particles and the aluminum hydroxide particles satisfy the following conditions (i) to (v): (i) the average secondary particle diameter measured by a microtrack method is 0.4 to 4 .mu.m; (ii) the specific surface measured by a BET method is 1 to 15 m.sup.2 /g; (iii) the total content of an iron compound and a manganese compound is 200 ppm or less in terms of metals (Fe+Mn); (iv) the ratio of the specific surface measured by the BET method to the specific surface measured by a Blaine method is 1 to 4; and (v) the content of a water-soluble sodium salt is 500 ppm or less in terms of metal sodium.

Abstract: A flame retardant having heat deterioration resistance which is composed of magnesium hydroxide particles having (i) an average secondary particle diameter, measured by a laser diffraction scattering method, of not more than 2 .mu.m, (ii) a specific surface area, measured by a BET method, of not more than 20 m.sup.2 /g and containing (iii) a total amount of an iron compound and a manganese compound of not more than 0.02% by weight in terms of metals, and a synthetic resin composition comprising the same and a molded article therefrom.