Abstract: The present invention provides a porous titanium oxide having improved ultraviolet protection ability, usability, and transparency in the visible region and a process for producing thereof. The porous titanium oxide powder according to the present invention can be obtained by adding an alkali to a titanium salt solution containing a polyalcohol and then thermally hydrolyzing the solution. In addition, it is possible that after the addition of the alkali, an acid is further added to the solution and then the thermal hydrolysis is conducted, or that after thermal hydrolysis, further heat treatment with an acid is conducted. A porous titanium oxide has a mean particle size of 0.01 to 1.0 ?m and a specific surface area of 50 m2/g or more.

Abstract: It is to provide a production method of zinc oxide powder excellent in UV protection ability and transparency and to provide cosmetics containing the same. The fine particle zinc oxide powder is produced by subjecting either an aqueous solution containing both a water-soluble zinc salt and a carboxylic acid or an aqueous solution containing a water-soluble zinc carboxylate to pH adjustment with an alkali carbonate agent and aging the resulting mixture without calcining. The alkali carbonate agent may be 0.1 to 2 mol/L aqueous solution and the carboxylate group is 1 to 5 times in moles with respect to zinc. The pH adjustment can be carried out by dropwise addition of the alkali carbonate aqueous solution at 0.5 to 5 mL/min per 100 mL of either the aqueous solution containing both the water-soluble zinc salt and the carboxylic acid or the aqueous solution containing the water-soluble zinc carboxylate.

Abstract: There is provided a titanium oxide powder having excellent ultraviolet-protecting ability, usability and transparency, and a method of manufacturing the same. The titanium oxide powder provided is a porous titanium oxide powder that is formed from titanium oxide primary particles agglomerated together, has a mean particle diameter of 0.01 to 100 ?m, and has a specific surface area of 250 to 500 m2/g. The porous titanium oxide powder can be obtained by subjecting a titanium salt solution to hydrolysis by heating under the presence of an aliphatic alcohol and/or a substance having a carboxyl group or a carbonyl group, and then further carrying out heating treatment with an acid. The titanium oxide primary particles preferably have a mean particle diameter of 1 to 50 nm, and the powder preferably has an approximately spherical shape with the ratio of the minor axis to the major axis being at least 0.75.

Abstract: It is to provide a production method of zinc oxide powder excellent in UV protection ability and transparency and to provide cosmetics containing the same. The fine particle zinc oxide powder is produced by subjecting either an aqueous solution containing both a water-soluble zinc salt and a carboxylic acid or an aqueous solution containing a water-soluble zinc carboxylate to pH adjustment with an alkali carbonate agent and aging the resulting mixture without calcining. The alkali carbonate agent may be 0.1 to 2 mol/L aqueous solution and the carboxylate group is 1 to 5 times in moles with respect to zinc. The pH adjustment can be carried out by dropwise addition of the alkali carbonate aqueous solution at 0.5 to 5 mL/min per 100 mL of either the aqueous solution containing both the water-soluble zinc salt and the carboxylic acid or the aqueous solution containing the water-soluble zinc carboxylate.

Abstract: The present invention provides a porous titanium oxide having improved ultraviolet protection ability, usability, and transparency in the visible region and a process for producing thereof. The porous titanium oxide powder according to the present invention can be obtained by adding an alkali to a titanium salt solution containing a polyalcohol and then thermally hydrolyzing the solution. In addition, it is possible that after the addition of the alkali, an acid is further added to the solution and then the thermal hydrolysis is conducted, or that after thermal hydrolysis, further heat treatment with an acid is conducted. A porous titanium oxide has a mean particle size of 0.01 to 1.0 ?m and a specific surface area of 50 m2/g or more.

Abstract: The present invention provides a powder that can display excellent protection ability in both UV-A and UV-B regions. The titanium oxide-zinc oxide aggregate powder comprises an aggregate formed by the aggregation of porous titanium oxide particles and zinc oxide particles, and said porous titanium oxide particle is an aggregate of primary fine particles of titanium oxide. The production method of the titanium oxide-zinc oxide aggregate powder comprises the steps of: (a) hydrolyzing, with heating, an aqueous solution containing a titanium salt and an aliphatic alcohol; (b) adding a water-soluble zinc salt to a suspension of a precipitate obtained by the hydrolysis with heating in step (a), and then neutralizing the suspension with an alkali; and (c) calcining a precipitate obtained by the neutralization in step (b).

Abstract: The method for producing a disintegratable zinc oxide powder of the present invention is characterized by comprising: neutralizing an aqueous solution containing a water-soluble zinc salt and a carboxylic acid or an aqueous solution containing a water-soluble zinc carboxylate with an alkali carbonate to produce precipitate; and firing the precipitate to obtain zinc oxide powder. As a water-soluble zinc salt, zinc chloride or zinc acetate is preferably used. As an acid, acetic acid is preferably used. As an alkali carbonate, sodium carbonate is preferably used. The disintegratable zinc oxide powder has the morphology in which the primary particles of zinc oxide are aggregated to form secondary particles, and these secondary particles are further aggregated to form the zinc oxide powder. The powder can achieve excellent UV protection capability, excellent transparency, and excellent feeling in use through its disintegration. Also, it has good usability and good handling properties.

Abstract: There is provided a titanium oxide powder having excellent ultraviolet-protecting ability, usability and transparency, and a method of manufacturing the same. The titanium oxide powder provided is a porous titanium oxide powder that is formed from titanium oxide primary particles agglomerated together, has a mean particle diameter of 0.01 to 100 ?m, and has a specific surface area of 250 to 500 m2/g. The porous titanium oxide powder can be obtained by subjecting a titanium salt solution to hydrolysis by heating under the presence of an aliphatic alcohol and/or a substance having a carboxyl group or a carbonyl group, and then further carrying out heating treatment with an acid. The titanium oxide primary particles preferably have a mean particle diameter of 1 to 50 nm, and the powder preferably has an approximately spherical shape with the ratio of the minor axis to the major axis being at least 0.75.

Abstract: A rod-shaped mesoporous powder which is mainly composed of silicon oxide and has homogenous pore, and obtained by a process comprises, a dissolution step wherein a concentration of 0.3-1.2M of a silicate which is in the range of 0<SiO2/Y2O<2 (Y: alkali metal atom) is dissolved in the presence of a cationic surfactant and the pH is 11 or more, a condensation step wherein the pH is adjusted to 10.5 or less within 30 minutes, a rod micelle is formed with said cationic surfactant and a silicate is condensed on said rod micelle, and a removal step wherein said cationic surfactant is removed from a micelle state condensation which has an outer shell made of the silicate by said condensation.

Abstract: External skin preparations with a sun-screening effect are frequently blended with an ultraviolet absorbent octyl methoxycinnamate together with ultraviolet reflectors titanium oxide and zinc oxide in powder. The skin irritation of octyl methoxycinnamate is enhanced when blended with the powders of titanium oxide and zinc oxide and the like. It is an object of the invention to provide an external skin preparation capable of reducing the skin irritation.

Abstract: A non-laminar silicon oxide powder manufactured by a process comprising, a dissolution step wherein a concentration of 0.1-5.0M of a silicate which is in the range of 0<SiO2/Y2O<2 (Y: alkali metal atom) is dissolved in the presence of a cationic surfactant and the pH is 11 or more, a condensation step wherein the pH is adjusted to 10.5 or less and a rod-like micelle is formed with said cationic surfactant and a silicate is condensed on said rod-like micelle, and a removal step wherein said cationic surfactant is removed from the micelle state condensation which has an outer shell made of the silicate by said condensation. The silicon oxide powder is useful as a carrier for cosmetics, pharmaceutical drugs and perfumes.

Abstract: A rod-shaped mesoporous powder which is mainly composed of silicon oxide and has homogenous pore, and obtained by a process comprises, a dissolution step wherein a concentration of 0.3-1.2M of a silicate which is in the range of 0<SiO2/Y2O<2 (Y:alkali metal atom) is dissolved in the presence of a cationic surfactant and the pH is 11 or more, a condensation step wherein the pH is adjusted to 10.5 or less within 30 minutes, a rod micelle is formed with said cationic surfactant and a silicate is condensed on said rod micelle, and a removal step wherein said cationic surfactant is removed from a micelle state condensation which has an outer shell made of the silicate by said condensation.

Abstract: To provide a complex which is excellent in transparency and protective ability of UVB region by containing titanium oxide in a specific silica carrier and a cosmetic preparation which has natural finishing i.e., excellent in transparency by the complex and is excellent in protective ability of UVB region, a titanium-silica complex in accordance with the present invention comprises a silica carrier and titanium oxide, wherein said silica carrier is mainly composed of silicon oxide and wherein titanium oxide is contained in said silica carrier.

Abstract: A pigment containing low-order titanium oxide of this invention is characterized in that both aluminum oxide and silicon oxide exist together with low-order titanium oxide. A method of manufacturing such a pigment comprises the steps of; presenting an aluminum compound and silicon as a reducing agents together with titanium dioxide: and then heating and reducing the mixture in an atmosphere having a low oxygen content. According to this method, the pigment containing low-order titanium oxide can efficiently be manufactured, while preventing sintering generated due to the fusion between the reducing agents or the reducing agents and powders.