An electron beam curable paint comprises: a dispersion solution of inorganic nanomaterial, a dispersion solution of inorganic nanoultraviolet absorbent, a polyfunctional monomer and an acrylate prepolymer, wherein the dispersion solution of the inorganic nanomaterial is selected from one or two of a dispersion solution of silicon dioxide and a dispersion solution of aluminum oxide, and the dispersion solution of the inorganic ultraviolet absorbent is a dispersion solution of titanium dioxide or a dispersion solution of zinc oxide. The silicon dioxide, the aluminum oxide, the titanium dioxide and the zinc oxide are respectively surface modified and are dissolved in acrylate monomer to form the dispersion solution of the inorganic material without agglomeration.

A process for producing a particulate TiO.sub.2 includes supplementing metatitanic acid with an alkali compound in a quantity of 1200 ppm to 2400 ppm of alkali, with a phosphorus compound in a quantity of 0.1 wt.-% to 0.3 wt.-% by weight of P, expressed as phosphorus, and with an aluminum compound in a quantity of 1 ppm to 1000 ppm of Al, expressed as Al, to obtain a mixture. The quantity of the alkali compound, of the phosphorus compound, and of the aluminum compound are with respect to the TiO.sub.2 content. The mixture is calcined at a constant temperature of 940° C. to 1020° C. until a numerical fraction X.sub.50 of TiO.sub.2 has a primary crystallite size of at least 200 nm, to obtain a calcined mixture. The calcined mixture is cooled to obtain a cooled calcined mixture. The cooled calcined mixture is grinded to obtain the particulate TiO.sub.2.

Provided is a dispersion liquid for sealing a light-emitting element containing metal oxide particles having a refractive index of 1.7 or higher and a surface-modifying material at least partially attached to the metal oxide particles, in which a particle diameter D50 of the metal oxide particles when a cumulative percentage of a scattering intensity distribution obtained by a dynamic light scattering method is 50% is 30 nm or more and 100 nm or less, and a content of the surface-modifying material not attached to the metal oxide particles is 60% by mass or less with respect to a total content of the metal oxide particles and the surface-modifying material.

Provided are: dispersion in which titanium dioxide microparticles are highly dispersed in an organic solvent; and a method for producing the dispersion.

The dispersion comprises at least titanium dioxide microparticles, an organic solvent, a silane coupling agent, and a dispersant having a basic adsorptive group, wherein the ratio of the mass of the dispersant to that of the silane coupling agent is 15 to 75% by mass. It is preferred that the ratio of the total mass of the silane coupling agent and the dispersant to the mass of the titanium dioxide microparticles is 10 to 40% by mass. The dispersion is produced by dispersing the titanium dioxide microparticles together with the above-specified amounts of the silane coupling agent and the dispersant having a basic adsorptive group in the organic solvent.

An actinic radiation-curable inkjet ink contains an actinic radiation-polymerizable compound, surface-treated titanium oxide, and a wax. The surface-treated titanium oxide contains carbon atoms in an amount of 0.31 mass % to 2.0 mass % based on the total mass thereof.

The present invention is a composition comprising an aqueous dispersion of metal oxide pigment particles coated with an organosilane polymer comprising structural units of an alkyltrihydroxysilane or a salt thereof, a dialkyldihydroxysilane or a salt thereof, and an ancillary alkylsilane triol. The composition of the present invention provides hydrophobicity to pigment particles, thereby imparting water resistance, and allows for high loadings of pigment in water without increased viscosity. The dispersion is further useful for providing stain and corrosion resistance in coatings arising from paints.

A coated powder comprises (a) particles, and (b) a coating on the surface of the particles including (1) silica moieties, (2) organo oxysilane moieties selected from the group consisting of mono-organo oxysilane moieties, bi-organo oxysilane moieties and tri-organo oxysilane moieties, and (3) poly(dialkyl)siloxane moieties. The amount by weight in SiO.sub.2 equivalents of the organo oxysilane moieties and the silica moieties is at least 0.0625% of the total coated powder weight per m.sup.2/g of the specific surface area of the particle to be coated.

A coated powder comprises (a) particles, and (b) a coating on the surface of the particles including (1) silica moieties, (2) organo oxysilane moieties selected from the group consisting of mono-organo oxysilane moieties, bi-organo oxysilane moieties and tri-organo oxysilane moieties, and (3) poly(dialkyl)siloxane moieties. The amount by weight in SiO.sub.2 equivalents of the organo oxysilane moieties and the silica moieties is at least 0.0625% of the total coated powder weight per m.sup.2/g of the specific surface area of the particle to be coated.

A dispersion liquid contains a metal oxide particle surface-modified with a silane compound and a silicone compound, when a transmission spectrum of the metal oxide particles that are obtained by vacuum-drying the dispersion liquid is measured in a wavenumber range of 800 cm.sup.−1 or more and 3800 cm.sup.−1 or less with FT-IR, IA/IB≤3.5 is satisfied (IA is a spectrum value at 3,500 cm.sup.−1 and IB is a spectrum value at 1,100 cm.sup.−1), and, when the dispersion liquid and methyl phenyl silicone are mixed such that a mass ratio of a total mass of the metal oxide particles and the surface-modifying material to a mass of methyl phenyl silicone becomes 30:70 and the hydrophobic solvent is removed, a viscosity is 9 Pa.Math.s or less.

There has been demand for a titanium oxide organosol that has a high transparency and a high refractive index and that also exhibits an excellent viscosity stability over time. The rutile-type titanium oxide organosol according to the present invention comprises a silane coupling agent, a basic additive acting as a deflocculant, a water-insoluble solvent, and rutile-type titanium oxide particles that have been surface-treated with a hydrous oxide of at least one metal species selected from Zr, Ce, Sn, and Fe, the rutile-type titanium oxide organosol being characterized in that the Ti ratio contained in the colloidal particles in the rutile-type titanium oxide organosol is at least 60 mass% when calculated as the oxide, and the ratio of metal species at the colloidal particle surface derived from x-ray photoelectron spectroscopy is 20-50 mass%.