Abstract: To provide a process for producing inorganic spheres having a substantially uniform particle size with high productivity. In a process for producing inorganic spheres, which comprises a step of injecting an alkaline aqueous liquid containing an inorganic compound into a laminar flow of an organic liquid containing a surfactant through micropores to form a W/O type emulsion, and a step of solidifying droplets of the aqueous liquid containing an inorganic compound in the W/O type emulsion by an acid to form inorganic spheres, as the organic liquid, one which is brought into contact with an acid in a state of the W/O type emulsion or after separated from the W/O type emulsion, or one which is brought into contact with the aqueous liquid and then separated and recovered, is used.

Abstract: To provide a process for producing inorganic spheres having a substantially uniform particle size with high productivity. In a process for producing inorganic spheres, which comprises a step of injecting an alkaline aqueous liquid containing an inorganic compound into a laminar flow of an organic liquid containing a surfactant through micropores to form a W/O type emulsion, and a step of solidifying droplets of the aqueous liquid containing an inorganic compound in the W/O type emulsion by an acid to form inorganic spheres, as the organic liquid, one which is brought into contact with an acid in a state of the W/O type emulsion or after separated from the W/O type emulsion, or one which is brought into contact with the aqueous liquid and then separated and recovered, is used.

Abstract: A process for producing inorganic spheres, which comprises injecting an aqueous liquid containing an inorganic compound through an inlet hole into an organic liquid which flows at a flow rate of from 0.001 to 2 m/s in a laminar flow state in a flow path to form a W/O type emulsion, and solidifying the aqueous liquid containing an inorganic compound in the W/O type emulsion.

Abstract: To provide a process for producing inorganic spheres having a substantially uniform particle size with high productivity. In a process for producing inorganic spheres, which comprises a step of injecting an alkaline aqueous liquid containing an inorganic compound into a laminar flow of an organic liquid containing a surfactant through micropores to form a W/O type emulsion, and a step of solidifying droplets of the aqueous liquid containing an inorganic compound in the W/O type emulsion by an acid to form inorganic spheres, as the organic liquid, one which is brought into contact with an acid in a state of the W/O type emulsion or after separated from the W/O type emulsion, or one which is brought into contact with the aqueous liquid and then separated and recovered, is used.

Abstract: There is provided a cosmetic, particularly a skin cosmetic, excellent in imparting transparency (transparent feeling) to the skin, conditioning the skin texture and making wrinkles and hair follicles imperceptible when applied. The cosmetic comprises a powder of porous spherical silica having an average particle size (based on volume) from 3.0 to 20 ?m, a maximum particle size of 50 ?m or smaller, and a pore volume from 1.5 to 3.0 cm3/g, wherein the powder is characterized in that the minimum value of dlog (storage elasticity)/dlog (shear stress) is ?10 or more, when 40 g of squalane is added to 15 cm3 of apparent volume of said powder of porous spherical silica, the resulting paste is charged in thickness of 2 mm between parallel plates of 2.

Abstract: A process for producing inorganic spheres, which comprises injecting an aqueous liquid containing an inorganic compound through an inlet hole into an organic liquid which flows at a flow rate of from 0.001 to 2 m/s in a laminar flow state in a flow path to form a W/O type emulsion, and solidifying the aqueous liquid containing an inorganic compound in the W/O type emulsion.

Abstract: A process for producing inorganic spheres, which comprises injecting an aqueous liquid containing an inorganic compound into a laminar flow of an organic liquid which runs at a flow rate of from 0.001 to 2 m/s in a flow path compartmentalized by a partition wall through a plurality of inlet holes formed in one partition wall to form a W/O type emulsion containing the organic liquid as a dispersion medium and the aqueous liquid containing the inorganic compound as a dispersed phase, and solidifying the aqueous liquid containing an inorganic compound in the W/O type emulsion, wherein the partition wall having a plurality of inlet holes is made of a metal sheet having a surface subjected to water repellent treatment.

Abstract: A process for producing a silica-alumina composite sol, which comprises mixing a silica hydrogel and an aluminum salt which, when dissolved in water, gives an acidic solution.

Abstract: It is an object of the present invention to obtain a composite sol capable of forming an ink-receiving layer having a high transparency and a high property for fixing dyes. The present invention provides a sol which is a colloidal solution having aggregate particles containing silica and alumina dispersed in an aqueous medium, wherein the silica is such that the primary particles are spherical and the average particle size of the primary particles is from 2 to 200 nm, the average particle size of the aggregate particles is at least twice the average particle size of the silica primary particles and at most 1,000 nm, the &zgr;-potential of the aggregate particles is at least +10 mV, and the pH of the solution is from 3 to 9.

Abstract: A process for producing an alumina sol, which comprises stirring a dispersion of an alumina hydrate having a solid content of from 1 to 40 wt % at a pH of from 7 to 12 with an effective consumptive power of at least 0.5 kW/m3 for aggregation treatment, and then adding an acid thereto for peptization treatment.

Abstract: A hollow glass microsphere having an average particle size of at most 15 &mgr;m based on volume, a maximum particle size of at most 30 &mgr;m and an average particle density of from 0.1 to 1.5 g/cm3, which has a glass composition consisting essentially of the following components by mass %: 1 SiO2 50.0-90.0%,   Al2O3 10.0-50.0%,   B2O3 0-12.0%, Na2O + K2O + Li2O 0-1.0%,  CaO 0-10.0%, MgO 0-10.0%, BaO + SrO 0-30.0%.

Abstract: A process for producing a silica-alumina composite sol, which comprises mixing a silica hydrogel and an aluminum salt which, when dissolved in water, gives an acidic solution.

Abstract: An alumina hydrate coating fluid having alumina hydrate particles dispersed in an aqueous medium, which contains, as binders, a polyvinyl alcohol and a polymerizable binder which is a compound having a hydrocarbon group with a hydroxy group or a compound having a polyoxyalkylene chain, said compound having a substituent with an unsaturated bond or a substituent with an epoxy group.

Abstract: A process for producing an alumina sol, which comprises stirring a dispersion of an alumina hydrate having a solid content of from 1 to 40 wt % at a pH of from 7 to 12 with an effective consumptive power of at least 0.5 kW/m.sup.3 for aggregation treatment, and then adding an acid thereto for peptization treatment.

Abstract: A recording medium comprising at least one boehmite-containing porous layer on a substrate, wherein the porous layer has pores having a pore radius of from 1 to 30 nm in a pore volume of from 0.3 to 1.2 ml/g, pores having a pore radius of from 10 to 30 nm in a pore volume of from 0.2 to 1.0 ml/g and pores having a pore radius of from 30 to 100 nm in a pore volume of not more than 0.3 ml/g, and the b-axis of a boehmite crystal is oriented vertically with respect to the surface of the substrate.

Abstract: A recording sheet comprising a substrate and a colorant absorbing layer made of a porous inorganic oxide, formed on the substrate, wherein said colorant absorbing layer contains an organic acid with the first acid dissociation exponent of at most 5, which has an aromatic nucleus or at least two carboxyl groups.

Abstract: An oxide superconductor having a structure such that a double oxide of at least one metal selected from the Group 2A elements and at least one metal selected from the Group 4A, Group 4B and rare earth elements, is dispersed in oxide superconductor crystals.

Abstract: An oxide superconductor comprising a matrix of plate crystals of the formula REBa.sub.2 Cu.sub.3 O.sub.7-y wherein RE is at least one member selected from the group consisting of Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu, and y is the amount of oxygen deficiency, oriented and overlaid one on another, and granular crystals of the formula RE.sub.2 BACuO.sub.5 wherein RE is as defined above, insularly dispersed in the matrix in an amount of at least 0.1 mol per mol of the REBa.sub.2 Cu.sub.3 O.sub.7-y crystals.

Abstract: An electrolytic capacitor comprising a capacitor element and an electrolyte impregnated to the element, wherein the electrolyte comprises benzoic acid or its salt and an aliphatic saturated dibasic carboxylic acid having an odd number of carbon atoms or its salt.

Abstract: An electrolytic capacitor comprising a capacitor element and an electrolyte impregnated to the element, wherein the electrolyte contains a flurorocarboxylic acid or its salt as a solute dissolved in an organic solvent.