Abstract: It is an object of the present invention to provide zinc oxide particles which have excellent ultraviolet blocking performance and also excellent dispersibility, and therefore can be suitably used as an ultraviolet blocking agent for cosmetics. Provided are zinc oxide particles having a primary particle diameter of less than 0.1 ?m, an aspect ratio of less than 2.5 and an oil absorption/BET specific surface area of 1.5 ml/100 m2 or less.

Abstract: The invention provides a process for producing an aqueous dispersion of zirconium oxide that includes: reacting a zirconium salt with an alkali in water to obtain a slurry of particles of zirconium oxide; filtering, washing, and repulping the slurry; adding an organic acid to the resulting slurry in an amount of one mole part or more per mole part of the zirconium in the slurry; hydrothermally treating the resulting mixture at a temperature of 170° C. or higher; and washing the resulting aqueous dispersion of particles of zirconium oxide.

Abstract: It is an object of the present invention to provide an alkaline earth metal aluminate phosphor having good heat resistance and durability against vacuum ultraviolet rays and ultraviolet rays, among others, and a method of producing the same. An alkaline earth metal aluminate phosphor containing bivalent europium as an activator, which contains at least one element (e) selected from the group consisting of indium, tungsten, niobium, bismuth, molybdenum, tantalum, thallium and lead.

Abstract: The present disclosure provides an exoergic filler composition which is able to exert superior exoergic property, and a resin composition, a grease, and a coating composition which having superior exoergic property, respectively, by using the above-mentioned exoergic filler composition. The exoergic filler composition contains 1 to 50 volume % of a needle-shaped zinc oxide having an average long diameter of 0.1 to 10 ?m, an average short diameter of 0.025 to 2.5 ?m, aspect ratio defined by (average long diameter)/(average short diameter) of 4 or more and specific surface area according to BET method of 50 m2/g or less, and 50 to 99 volume % of other exoergic filler.

Abstract: The invention provides a process for producing an aqueous dispersion of zirconium oxide comprising: reacting a zirconium salt with an alkali in water to obtain a slurry of particles of zirconium oxide; filtering, washing, and repulping the slurry; adding an organic acid to the resulting slurry in an amount of one mole part or more per mole part of the zirconium in the slurry; hydrothermally treating the resulting mixture at a temperature of 170° C. or higher; and washing the resulting aqueous dispersion of particles of zirconium oxide.

Abstract: A titanium oxide photocatalyst that is capable of improving a decomposition rate, and a method for producing the same are provided. The titanium oxide photocatalyst of the present invention is a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and 90 wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.

Abstract: An object of the present invention is to provide large-sized zinc oxide particles that show, when incorporated to a cosmetic product, excellent properties including transparency, infrared reflection, and the like without deteriorating the feel; and also a cosmetic containing the same. The zinc oxide particles having an average particle diameter of 3 to 20 ?m, an average friction coefficient of 3 or less, a total visible light transmittance of 85% or more, and a near-infrared reflectance of 80% or more.

Abstract: The present disclosure provides an exoergic filler composition which is able to exert superior exoergic property, and a resin composition, a grease, and a coating composition which having superior exoergic property, respectively, by using the above-mentioned exoergic filler composition. The exoergic filler composition contains 1 to 50 volume % of a needle-shaped zinc oxide having an average long diameter of 0.1 to 10 ?m, an average short diameter of 0.025 to 2.5 ?m, aspect ratio defined by (average long diameter)/(average short diameter) of 4 or more and specific surface area according to BET method of 50 m2/g or less, and 50 to 99 volume % of other exoergic filler.

Abstract: The present disclosure provides a zinc oxide particle that can be used more suitably than common zinc oxide in the application such as an exoergic filler and the like, and can be used in the other applications. A zinc oxide particle having a median size of 1 to 30 ?m and D90/D10 of 4 or less is provided.

Abstract: Zinc sulfide phosphor that has high energy efficiency and color purity and that emits blue light is provided. Specifically, a zinc sulfide phosphor adapted for use as a light source or in a display by being applied to powder EL elements is provided. The zinc sulfide blue phosphor comprises copper, silver or both elements and nickel, iron or both elements. The phosphor is obtained by adding a compound comprising copper, silver or both elements, a zinc compound, a sulfidizing agent and a compound comprising nickel, iron or both elements as an aqueous solution to an organic solvent to form a reaction mixture, heating the mixture and removing water from the reaction mixture by azeotropic dehydration of water and the organic solvent to obtain a zinc sulfide phosphor precursor, further sintering the zinc sulfide phosphor precursor.

Abstract: The invention provides a process for production of a composition comprising a perovskite structure compound, the process comprising: a first process to heat a hydrous oxide of at least one B group element selected from the group consisting of Ti, Zr, Hf, and Sn at a temperature within a range of 80 to 300° C. in the presence of an aqueous medium so as to dehydrate the hydrous oxide; and a second process to heat a reaction product obtained in the first process and a hydroxide of at least one A group element selected from the group consisting of Ba, Sr, Ca, Mg and Pb at a temperature within a range of 100 to 300° C. in the presence of an aqueous medium. The process provides a composition comprising an ABO3 compound in the form of uniform and fine spherical particles which have an average particle diameter of 1 ?m or less, preferably within a range of 0.01 to 0.5 ?m, high crystallinity, and a controlled A/B ratio as desired, as well as few internal pores in the crystalline particles.

Abstract: A zinc oxide particle having large particle diameter and being high-density is provided. An exoergic resin composition, an exoergic grease and an exoergic coating composition containing the zinc oxide particle exhibit an excellent exoergic property. The zinc oxide particle being high-density, has a density of 4.0 g/cm3 or more, median size (D50) of 17 to 10000 ?m and tap bulk density of 3.10 g/cm3 or more.

Abstract: Disclosed are titanium dioxide-containing composite particles which can maintain whiteness of natural titanium dioxide even after calcination step, and can provide titanium dioxide-containing composite particles having excellent weather resistance. In each of the composite particles, at least one oxide layer containing silicon oxide and zirconium oxide is provided as coating components of titanium dioxide. That is, provided are composite particles including a base that contains titanium dioxide and at least one oxide layer that contains silicon oxide and zirconium oxide provided on the base, and a method of producing the composite particles.

Abstract: The object of the present disclosure is to obtain silica particles having the sharp particle size distribution and low water-absorbing rate and being used suitably as a filler of a sealing resin composition, a method for producing it, and a resin composition containing the silica particles and a resin. Silica particle having a water-absorbing rate of less than 1.0% measured 500 hours after being kept at a temperature of 50° C. and at a humidity of 90%, and at a temperature of 85° C. and at a humidity of 85%, D90/D10 of 3 or less, a true specific gravity of 2.1 g/cm3 or more, and an average particle diameter of 10 ?m or less.

Abstract: The present disclosure provides a magnesium oxide particle that can be used more suitably than common magnesium oxide in the application such as an exoergic filler and the like. A magnesium oxide particle having (median size)/(specific surface diameter obtained from specific surface area) ratio of 3 or less and D90/D10 of 4 or less is provided.

Abstract: A method for producing a catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, which comprises hydrolyzing an organic silicon compound and/or an organic aluminum compound and/or an organic zirconium compound in an organic solvent in which particles of a solid are dispersed thereby to form an inner coat layer either of an oxide of at least one element selected from silicon, aluminum and zirconium or of a composite oxide of at least two elements selected from silicon, aluminum and zirconium, and then hydrolyzing an organic titanium compound in the organic solvent in which the particles of a solid base having the inner coat layer thereon are dispersed thereby to form an outer coat layer of titanic acid on the inner coat layer of the particles of a solid base.

Abstract: The present disclosure provides powdery (poly)piperazine pyrophosphate that is not accompanied by difficult-to-remove byproducts and is not tinged with a color that would adversely affect the coloring of the molded article. The present disclosure also provides a method of producing such powdery (poly)piperazine pyrophosphate in an efficient manner and with a high yield. The present disclosure relates to a method for providing powdery (poly)piperazine pyrophosphate, which includes the step of dehydration condensation of piperazine diphosphate to prepare (poly)piperazine pyrophosphate. The step is performed under an inert gas atmosphere, and thereby powdery (poly)piperazine pyrophosphate having a whiteness of 80 to 100 as a W value, and a yellowness of 0 to 5 as a YI value is produced.

Abstract: A titanium oxide photocatalyst that is capable of improving a decomposition rate, and a method for producing the same are provided. The titanium oxide photocatalyst of the present invention is a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and 90 wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.

Abstract: Disclosed are a method of producing fine particulate alkali metal niobate in a liquid phase system, wherein the size and shape of particles of the fine particulate alkali metal niobate can be controlled; and fine particulate alkali metal niobate having a controlled shape and size. Specifically disclosed are a method of producing particulate sodium-potassium niobate represented by the formula (1): NaxK(1-x)NbO3 (1), the method including four specific steps, wherein a high-concentration alkaline solution containing Na+ ion and K+ ion is used as an alkaline solution; and particulate sodium-potassium niobate having a controlled shape and size.

Abstract: A titanium oxide photocatalyst that is capable of improving a decomposition rate, and a method for producing the same are provided. The titanium oxide photocatalyst of the present invention is a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and 90 wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.