Abstract: A flame retardant is provided which has excellent dispersibility in resin ingredients and can give flame-retardant resin moldings excellent in flame retardancy and mechanical properties. The flame retardant comprises magnesium hydroxide particles, a higher fatty acid, preferably stearic acid, bonded to part of the surface of the magnesium hydroxide particles, and a silicone oil having reactivity bonded to that surface part of the magnesium hydroxide particles which does not have the higher fatty acid bonded thereto.

Abstract: A producing method for producing zirconia hollow particles in which a zirconia powder mutually combines to form a porous shell layer thereby constructing a hollow structure, the method being characterized in mixing under a pressurized contact a resin powder and a zirconia powder of a grain size smaller than that of the resin powder, thereby forming a precursor by covering a surface of the resin powder with the zirconia powder in a partially embedded state, and calcining the precursor to expel the resin powder and to mutually sinter the zirconia powder.

Abstract: A flame retardant is provided which has excellent dispersibility in resin ingredients and can give flame-retardant resin moldings excellent in flame retardancy and mechanical properties. The flame retardant comprises magnesium hydroxide particles, a higher fatty acid, preferably stearic acid, bonded to part of the surface of the magnesium hydroxide particles, and a silicone oil having reactivity bonded to that surface part of the magnesium hydroxide particles which does not have the higher fatty acid bonded thereto.

Abstract: A method of producing hollow alumina particles in which the grain size of hollow alumina particles is controlled and in which a high formation ratio of hollow particles is obtained while suppressing the formation of solid particles. The method includes irradiating supersonic waves to an aqueous solution containing aluminum nitrate or aluminum acetate, and a surfactant or an organic acid to generate micro-liquid droplets in an atomized state, introducing only minute liquid droplets having a certain grain size or less, which have been classified by an air stream, into a furnace and burning them in air.

Abstract: A polyolefin resin composition is comprised of a polyolefin, polyamide fibers, a silane coupling agent and silica particles. It is produced by kneading silica particles and a resin composition comprised of at least a polyolefin, polyamide fibers, and a silane coupling agent. Alternatively, it is produced by kneading a polyamide and a resin composition comprised of at least a polyolefin, a silane coupling agent, and silica particles. Still alternatively, it is produced by kneading a polyolefin, a polyamide, a silane coupling agent, and silica particles. It can be preferably used for industrial products as it is, or as a master batch serving as a reinforcement or a modifier to be added to another resin or rubber.

Abstract: The present invention provides (1) hollow ceramics particles having a hollow structure formed by a porous shell layer comprising ceramics powders bonded to each other and having an average particle diameter of from 10 to 100 ?m and a breaking strength of 5×104 MPa or more, (2) a hollow ceramics particles-containing composite material comprising hollow ceramics particles dispersed in a matrix which hollow ceramics particles formed by a porous shell layer comprising ceramics powders bonded to each other, wherein the aforementioned hollow ceramics particles are hollow particles obtained by sintering a precursor comprising the aforementioned ceramics powder covered by a resin powder in such an arrangement that a part of the aforementioned ceramics powder is embedded in the resin powder, and (3) a sliding member made of the aforementioned a hollow ceramics particles-containing composite material.

Abstract: Provided are magnesium hydroxide and composite magnesium hydroxide-silica particle which can make resin composition and good in wear resistance and other aspects of strength, elastic modulus, etc., method for the manufacture thereof, method for the surface treatment thereof, and resin composition and electric wire or cable made by using the same. They are obtained by, for example, reacting a magnesium salt and a metal hydroxide or reacting a magnesium salt and a metal hydroxide in the presence of silica particles and can be incorporated with a resin to form a resin composition. A resin composition characterized by containing magnesium hydroxide particles, silica particles and a resin preferably contains fumed silica particles having their surfaces treated with a methyl group.

Abstract: A producing method for producing zirconia hollow particles in which a zirconia powder mutually combines to form a porous shell layer thereby constructing a hollow structure, the method being characterized in mixing under a pressurized contact a resin powder and a zirconia powder of a grain size smaller than that of the resin powder, thereby forming a precursor by covering a surface of the resin powder with the zirconia powder in a partially embedded state, and calcining the precursor to expel the resin powder and to mutually sinter the zirconia powder.

Abstract: Provided are a functional porous film having a plurality of functions, a method of manufacturing the same, and a sensor using the same. In the functional porous film, a functional portion having a different function from a porous body is disposed on the inner wall of a pore of the porous body. The functional porous film is formed through forming a precursor film including a pore-forming powder such as an organic powder on which a material powder of the functional portion is deposited and a material powder of the porous body, and then heating the precursor film to remove the pore-forming powder and sinter the material powder of the porous body.

Abstract: A method of producing hollow alumina particles capable of controlling the grain size of hollow alumina particles and providing high formation ratio of hollow particles while suppressing the formation of solid particles, the method comprising irradiating supersonic waves to an aqueous solution containing aluminum nitrate or aluminum acetate, and a surfactant or an organic acid to generate micro-liquid droplets in an atomized state, introducing the generated micro-liquid droplets only for the portion of minute liquid droplets having a certain grain size or less by an air stream and burning them in air.