Abstract: An ink jet recording medium having an ink receiving layer formed on a substrate, wherein an ink fixing agent contained in the ink receiving layer is a serpentine compound containing at least one metal selected from the group consisting of Mg and Zn, and an ink fixing agent which comprises a serpentine compound containing at least one metal selected from the group consisting of Mg and Zn and is used in the ink jet recording medium. According to the present invention, an ink jet recording medium having excellent ink absorptivity (color development, resolution) and excellent water resistance and light resistance for an image recorded on the medium can be provided by using a serpentine compound as an ink fixing agent. That is, according to the present invention, there can be provided an ink jet recording medium which is best suited for recording with a water/oil ink, can record a high-definition image at a high reproducibility and has excellent keeping properties, especially water resistance and light resistance.

Abstract: An antacid and laxative tablet comprising magnesium oxide particles as an effective component, wherein (i) the magnesium oxide particles contained in the tablet have an average secondary particle diameter measured by a laser diffraction scattering method of 0.5 to 10 ?m, (ii) the content of magnesium oxide particles in the tablet is 88 wt % or more, (iii) the tablet does not become blackish and has substantially no tableting spot, and (iv) the disintegration time is 10 sec or less. The antacid and laxative tablet of the present invention has a high content of magnesium oxide particles, a short disintegration time, does not become blackish, has no tablet trouble and no tableting spot and is suitably administered orally.

Abstract: Provided are magnesium hydroxide particles having a hexagonal crystal form and having an aspect ratio (H) which satisfies the following expression (I), 0.45·A·B<H<1.1·A·B??(I) (wherein H is an aspect ratio, A is an average secondary particle diameter (?m) of all of the particles measured by a laser diffraction scattering method and B is a specific surface area (m2/g) of all of the particles measured by a BET method), a flame-retardant comprising the particles, a flame-retardant resin composition comprising 100 parts by weight of a synthetic resin and a 5 to 300 parts by weight of the magnesium hydroxide particles, and a molded article therefrom. The magnesium hydroxide particles are hexagonal single crystals, the hexagonal form thereof are not necessarily required to be regular hexagonal, and the size thereof are not necessarily constant.

Abstract: A dye fixing agent for water-color ink to be contained in the water-color ink accepting layer of an ink jet recording medium having an water-color ink accepting layer formed on a substrate, which is a hydrotalcite compound containing a silicic acid anion and a sulfuric acid ion, or a silicic acid anion as an anion(s). An ink jet recording medium comprising the dye fixing agent for water-color ink formed on a substrate. The dye fixing agent for water-color ink of the present invention is excellent in the fixability of water-color ink, the resolution of an image recorded on a medium, water resistance and light resistance.

Abstract: A dispersion comprising hydrotalcite compound particles having (1) an average secondary particle diameter of 0.1 to 3 ?m as measured by a laser beam diffraction scattering method, (2) a specific surface area of 0.5 to 10 m2/g as measured by a BET method, and (3) a platy crystal particle shape, and an organic polar solvent; and a dope for polyurethane or aromatic polyamide article. The present invention has made it possible to provide hydrotalcite compound particles having superior affinity to and dispersibility in organic polar solvents, and a dope having the above particles dispersed therein uniformly, used for production of polyurethane or aromatic polyamide article.

Abstract: The coloring problem of a conventional molded article is overcome while retaining the advantages of high strength and high flame retardancy of the molded article when a metal hydroxide is used in combination with red phosphorus and carbon powder in the method of imparting a synthetic resin with flame retardancy. The molded article can be colored in any color and exhibits decreased lowering of electric insulation resistance when submerged. The molded article comprises a base material colored from dark red to black containing 100 wt parts synthetic resin, 5-200 wt parts metal hydroxide, 1-30 wt parts red phosphorus and 0.1-30 wt parts carbon powder; and a skin layer laminated thereon masking a colored surface of the base wherein the skin layer contains 100 wt parts, 0-100 wt parts pigment, and 0-200 wt parts metal hydroxide, provided that the total amount of pigment and metal hydroxide in the skin layer is at least 0.001 wt parts.

Abstract: Provided are magnesium hydroxide particles having a hexagonal crystal form and having an aspect ratio (H) which satisfies the following expression (I), 0.45·A·B<H<1.1·A·B  (I) (wherein H is an aspect ratio, A is an average secondary particle diameter (&mgr;m) of all of the particles measured by a laser diffraction scattering method and B is a specific surface area (m2/g) of all of the particles measured by a BET method), a flame-retardant comprising the particles, a flame-retardant resin composition comprising 100 parts by weight of a synthetic resin and a 5 to 300 parts by weight of the magnesium hydroxide particles, and a molded article therefrom. The magnesium hydroxide particles are hexagonal single crystals, the hexagonal form thereof are not necessarily required to be regular hexagonal, and the size thereof are not necessarily constant.

Abstract: An adsorbent to an aromatic hydroxy compound, which comprises composite metal oxide solid solution particles of the following formula (1) or hydrotalcite-like composite metal hydroxide particles of the following formula (2), and a method of removing an aromatic hydroxy compound in a solvent by using the adsorbent. (Mgy1M2+y2)1−xAlxO1+0.5x  (1) (Mgy1M2+y2)1−zAlz(OH)2+a(An−)b.mH2O  (2) Provided according to the present invention is an adsorbent capable of efficiently removing an aromatic hydroxy compound from an aqueous solvent or an organic solvent containing an aromatic hydroxy compound.

Abstract: A dye fixing agent for water-color ink to be contained in the water-color ink accepting layer of an ink jet recording medium having a water-color ink accepting layer formed on a substrate, which is a hydrotalcite compound containing a silicic acid anion and a sulfuric acid ion, or a silicic acid anion as an anion(s) and metal lithium. An ink jet recording medium comprising the dye fixing agent for water-color ink on a substrate. The dye fixing agent for water-color ink provided by the present invention is excellent in the fixability of water-color ink and the ink jet recording medium provided by the present invention is excellent in the resolution, water resistance and light resistance of an image recorded on the medium.

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 flame-retardant for a synthetic resin, which is obtained by surface-treating a magnesium hydroxide with an emulsion of a copolymer or polymer of the formula (1), wherein X is hydrogen, a phenyl group, etc., Y is an alkyl group, etc., each of R1 and R2 is hydrogen, an alkyl group, etc., m is 0 or a positive integer, n is a positive integer, and “˜” shows the polymerization state of a main chain, the formula (2), wherein X, Y, etc. are as defined in the formula (1), or the formula (3), wherein X and “˜” are as defined in the formula (1), each of Y1 and Y2 is hydrogen, an alkyl group, etc., each of R1, R2 and R3 is hydrogen or an alkyl group, and each of a, b and c is a positive integer, a resin composition containing said flame-retardant and a molded article thereof.

Abstract: A hydrotalcite compound which has the excellent ability to absorb infrared rays and has excellent light transmission when contained in an agricultural film; a process for producing the compound; and an infrared absorber and an agricultural film both containing the compound. The hydrotalcite compound is characterized by retaining as the interlayer anions at least one kind of anions selected among ions of silicon-, phosphorus-, and boron-containing polymeric oxyacids and another kind of anions.

Abstract: A process for the production of coupling agent-treated inorganic particles, which process is excellent in surface-treatment uniformity and uses a coupling agent at high coefficient of utilization, the process comprising adding a solution of a coupling agent into an aqueous suspension of inorganic particles with stirring and, after the mixing with stirring, heat-drying the resultant suspension without dehydration by filtration and concentration, and a synthetic resin composition containing the above particles and having excellent properties.

Abstract: A polyketone resin composition, which has flame retardancy and is suitable for a variety of molded articles is provided. A flame-retardant resin composition obtained by incorporating 15 to 60% by weight of surface-coated magnesium hydroxide having a specific surface area measured by a BET method of 1 to 15 m2/g and an average secondary particle diameter of 0.2 to 5 &mgr;m into a polyketone resin; and molded article thereof.

Abstract: Hydrotalcite compounds useful as additives to synthetic resins such as epoxy resins which are used as, in particular, sealant for semiconuctor devices such as transister, IC, LSI and the like, which are characterized by having a composition represented by the formula (1) below:

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: Novel, fine particulate synthetic chalcoalumite, process for preparation thereof, and a heat insulating agent and agricultural film containing said fine, particulate synthetic chalcoalumite. The above objects are met by synthetic chalcoalumite represented by formula (1) below: (M12+)a−x(M22+)Al3+4(OH)b(An−)c. mH2O  (1)  (in which M12+ stands for Zn2+ or Cu2+,  M22+ is at least one divalent metal ion selected from Ni2+, Co2+, Cu2+, Zn2+ and Mg2+,  a is 0.3<a<2.0 (with the proviso that M1 and M2 are not the same),  x is 0 ≦x<1.0, and x<a  b is 10<b<14,  An− is at least one selected from SO42−, HPO42−, CO32−, SO32−, HPO32−, NO3−, H2PO4−, Cl−, OH− and silicate ion,  c is 0.4<c<2.

Abstract: An antialgal method, which employs, as an antialgal component, at least one solid solution selected from the group consisting of specific hydroxide or oxide solid solutions and an organic or inorganic material containing the antialgal component.

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: Hydrotalcite compounds useful as additives to synthetic resins such as epoxy resins which are used as, in particular, sealant for semiconductor devices such as transister, IC, LSI and the like, which are characterized by having a composition represented by the formula (1) below: M1−X2+AlX3+(OH)2A2−X/2·mH2O  (1) in which M2+ is at least one of Mg2+ and Zn2+, x is a positive number in the range of 0.2≦x≦0.5, A2− is at least one of CO32− and SO42−, and m is a number in the range of 0-2, and having a uranium (U) content of not more than 10 ppb, an average secondary particle size of not more than about 3 &mgr;m and a BET specific surface area of not more than 30 m2/g.