Sakai Chemical Industry Co., Ltd.

Tohoku University

Fuji Ceramics Corporation

Satoru Sueda

Mitsuo Hashimoto

Atsuki Terabe

Koichiro Magara

Nobuo Watanabe

Atsushi Muramatsu

Kiyoshi Kanie

Hideto Mizutani

Mizuho Wada

Hirofumi Takahashi

Yasuhiro Okamoto

Hiroyuki Izumikawa

Hironobu Ogata

Keita Kobayashi

Ryohei Yoshida

Watanabe,nobuo

The invention provides a low alpha dose barium sulfate particle having a silica content of 0.6% by weight or less, an average particle diameter of 1 &#x3bc;m or less, a sulfur content of 10 ppm or less, and an alpha dose of 0.07 cph/cmor less.

Low alpha dose barium sulfate particle, and use and process for producing the same

The invention provides a low alpha dose barium sulfate particle having a silica content of 0.6% by weight or less and an alpha dose of 0.07 cph/cmor less.

It is one of objects of the present disclosure to provide hexagonal plate-shaped zinc oxide particles which can be used suitably for a cosmetic, a filler, a resin composition, an infrared radiation reflective material, and a coating composition, and a method for producing the same. Hexagonal plate-shaped zinc oxide particles having a primary particle diameter of 1.1 &#x3bc;m or more and a D90/D10 of 3.0 or less in particle size distribution.

Hexagonal plate-shaped zinc oxide particles, method for production of the same, and cosmetic, filler, resin composition, infrared reflective material, and coating composition containing the same

It is one of the objects of the present disclosure to provide hexagonal plate-shaped zinc oxide particles having suitable performances derived from the shape thereof, that is, zinc oxide particles having improved ultraviolet shielding ratio at the wavelength of 400 nm or less without impairing the direct transition properties of electronic excitation thereof and having remarkably improved ultraviolet shielding ratio for UV-B radiation and UV-A radiation. A zinc oxide particle containing a solid solution of a Ti element and/or a Fe element and a Zn element in at least a portion thereof, and having a hexagonal plate shape.

Zinc oxide particle, method for producing the same, ultraviolet shielding agent, and cosmetic

It is one of the objects of the present disclosure to provide hexagonal prism-shaped zinc oxide particles having improved ultraviolet shielding ratio at the wavelength of 400 nm or less without impairing the direct transition properties of electronic excitation thereof and having remarkably improved ultraviolet shielding ratio for UV-B radiation and UV-A radiation; and a zinc oxide particle containing a solid solution of a Ti element and/or a Fe element and a Zn element in at least a portion thereof, and having a hexagonal prism shape.

The present disclosure provides spherical zinc oxide particles consisting of integrated plate-like particles which can be used as a cosmetic raw material, a thermal conductive filler and the like, and a method for production of the same. Spherical zinc oxide particles consisting of integrated plate-like particles, which have a median size of 0.01 &#x3bc;m or more and a D90/D10 in particle size distribution of 5.0 or less are provided.

Spherical zinc oxide particle consisting of integrated plate-like particles, method for producing the same, cosmetic, and thermal conductive filler

It is an object of the present invention to provide hexagonal prism-shaped zinc oxide particles which have a specific particle diameter and a specific aspect ratio, and high ultraviolet blocking performance and transparency, and therefore can be suitably used as a cosmetic and a heat releasing material. Provided are hexagonal prism-shaped zinc oxide particles having a primary particle diameter of 0.1 &#x3bc;m or more and less than 0.5 &#x3bc;m and an aspect ratio of less than 2.5.

Hexagonal prism-shaped zinc oxide particles, method for production of the same, and cosmetic, heat releasing filler, heat releasing resin composition, heat releasing grease, and heat releasing coating composition comprising the same

An object of the present invention is to provide rounded zinc peroxide particles having a large particle diameter, the rounded zinc peroxide particles having excellent performance because they have an average particle diameter of 0.04 &#x3bc;m or more, a small aspect ratio and a shape close to a spherical shape; rounded zinc oxide particles which are obtained by calcinating the rounded zinc peroxide particles and which have a small aspect ratio and a sharp particle size distribution; a method for production thereof; and a cosmetic and a heat releasing filler each containing the rounded zinc oxide particles. Provided are rounded zinc peroxide particles having an average particle diameter of 0.04 &#x3bc;m or more and an aspect ratio of 2.0 or less, and rounded zinc oxide particles which are obtained by thermally decomposing the rounded zinc peroxide particles and which have an average particle diameter of 0.04 &#x3bc;m or more and an aspect ratio of 2.0 or less.

Rounded zinc peroxide particles, rounded zinc oxide particles, method for production thereof, cosmetic and heat releasing filler

An object of the present invention is to provide hexagonal plate-shaped zinc oxide particles which can be used as a cosmetic raw material, a heat releasing filler and the like, a method for production of the same, and a cosmetic, a heat releasing filler, a heat releasing resin composition, a heat releasing grease and a heat releasing coating composition each comprising the same. Provided are hexagonal plate-shaped zinc oxide particles having hexagonal-shaped surfaces, wherein the primary particle diameter is 0.01 &#x3bc;m or more and the aspect ratio is 2.5 or more, and 50% or more of 250 particles in a transmission electron microscope photograph satisfy both the requirements (1) the particle has a hexagonal-shaped surface; and (2) Dmin/Dmax&#x2267;0.3, where Dmax: a length of the largest diagonal line of three diagonal lines of the hexagonal-shaped surface of the hexagonal plate-shaped zinc oxide particle; and Dmin: a length of the smallest diagonal line of three diagonal lines of the hexagonal-shaped surface of the hexagonal plate-shaped zinc oxide particle.

Hexagonal plate-shaped zinc oxide particles, method for production of the same, and cosmetic, heat releasing filler, heat releasing resin composition, heat releasing grease, and heat releasing coating composition comprising the same

Disclosed are a method of producing fine particulate alkali metal niobate in a liquid phase system, wherein the size and shape of the particulate alkali metal niobate can be controlled; and fine particulate alkali metal niobate having a controlled shape and size. One of specifically disclosed is a method of producing a substantially rectangular cuboid particulate alkali metal niobate represented by MNbO(1), wherein M represents one element selected from alkaline metals, including specific four steps. Another one of specifically disclosed is particulate alkali metal niobate represented by the formula (1) having a substantially rectangular cuboid shape, wherein the substantially rectangular cuboid shape has a longest side and a shortest side, the length of the longest side represented by an index Lis 0.10 to 25 &#x3bc;m, and the length of the shortest side represented by an index Lis 0.050 to 15 &#x3bc;m.

Method for producing alkali metal niobate particles, and alkali metal niobate particles

The object of the present disclosure is to obtain a filler particle having stable insulation property, and a resin composition, grease, and a coating composition comprising the same, respectively. Filler particles comprising a composite zinc oxide expressed by the following chemical formula (1):ZnMO&#x2003;&#x2003;(1)in the formula, M is Mg, Co, Li, K, Na, or Cu, and x+ny/2=1 when the valence of M is n.

Filler particles, resin composition, grease, and coating composition

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 &#x3bc;m, an aspect ratio of less than 2.5 and an oil absorption/BET specific surface area of 1.5 ml/100 mor less.

Zinc oxide particles, method for production of the same, and cosmetic, heat releasing filler, heat releasing resin composition, heat releasing grease, and heat releasing coating composition comprising the same

It is an object of the present invention to provide a new method for production of zinc oxide particles which can control the particle diameter and particle shape of obtained zinc oxide particles by selecting suitable conditions, and can prepare zinc oxide applicable to various applications. A method for production of zinc oxide particles, comprising a step of aging a zinc oxide raw material in an aqueous zinc salt solution.

Method for production of zinc oxide particles

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): NaKNbO(1), the method including four specific steps, wherein a high-concentration alkaline solution containing Naion and Kion is used as an alkaline solution; and particulate sodium-potassium niobate having a controlled shape and size.

Growing community of inventors

Fukushima, Japan

Satoru Sueda