The present invention provides a powder surface treatment method comprising (i) a step for mixing 0.001-20 parts by mass of a surface treating agent composition with 100 parts by mass of a power, and (ii) a step for adding an acidic liquid, followed by mixing, wherein the surface treating agent composition contains (a)-(d) below: (a) one or more selected from among an N-acyl amino acid having a carbon chain length of C8-C22 and a salt thereof; (b) one or more selected from among monohydric and polyhydric alcohols; (c) water; and (d) one or more selected from among (dl) an amino acid having an isoelectric point of 7.5-11, and (d2) a compound which generates an ion selected from among an aluminum ion, a magnesium ion, a calcium ion, a zinc ion, a zirconia ion, and a titanium ion, in the surface treating agent composition.

A paint composition, which comprises a stanchion-encapsulated pigment such as titanium dioxide, can provide enhanced paint quality with reduced cost.

Despite significant progress in the synthesis of nanocomposite materials, integration of several components with various functions remains a big challenge, which significantly limits control over nanocomposite properties. The disclosure provides a multifunctional micro particle based on incorporation of titania nanoparticles combined into a porous polylactic acid (PLA) matrix. PLA is used as a biodegradable and biocompatible polymer and titania nanoparticles represent photocatalytically active nanofillers capable of degradation of organic compounds under solar irradiation. Titania nanoparticles are integrated with PLA by using ‘mixed’ and ‘in situ grown’ approaches. The hybrid systems effectively absorbed and degraded organic impurities from water. The sorption capacity, dye degradability, and PLA disintegration were controlled by varying the concentration of incorporated titania. The hybrid degradable systems can be applied as novel non-toxic photocatalytic materials for such as environmental cleanup of contaminated waters.

The invention provides a dispersion of precursor titanium dioxide particles having an intensity mean peak value particle size, measured by DLS, or a number mean peak value particle size, measured by DLS, in the range from 0.2 to 2.0 μm within a dispersing medium, wherein the particle size distribution of the titanium dioxide particles in dispersion is narrower than the particle size distribution of the precursor titanium dioxide particles. There is also provided the use of the dispersion of titanium dioxide particles to attenuate infrared radiation, particularly in a cosmetic composition, more particularly a cosmetic composition to provide protection against IR radiation, more particularly IRA radiation. There is also provided a personal care composition comprising the titanium dioxide dispersion.

In an embodiment a granular cover and/or filling material includes a plurality of particles, wherein each particle consists of a matrix material in which at least one filler particle is incorporated, and wherein each filler particle comprises titanium dioxide and a coating material.

Provided are surface-coated inorganic particles and a method for manufacturing the same, whereby the dispersibility of inorganic particles in an organic solvent can be improved, and a function or performance of the inorganic particles can thereby be adequately demonstrated. In the present invention, surfaces of inorganic particles of titanium oxide or the like are coated with a reaction product of a silicate compound having an amino group, and/or a hydrolysis product thereof, and at least one compound selected from the group consisting of a carboxylic acid, a carboxylic acid halide, an acid anhydride, a sulfonic acid halide, and an isocyanate. The reaction product forming the coating is preferably a silicate compound having at least one bond selected from the group consisting of an amide bond, a sulfonamide bond, a urethane bond, and a urea bond, and/or a hydrolysis product thereof.

Provided are surface-coated inorganic particles and a method for manufacturing the same, whereby the dispersibility of inorganic particles in an organic solvent can be improved, and a function or performance of the inorganic particles can thereby be adequately demonstrated. In the present invention, surfaces of inorganic particles of titanium oxide or the like are coated with a reaction product of a silicate compound having an amino group, and/or a hydrolysis product thereof, and at least one compound selected from the group consisting of a carboxylic acid, a carboxylic acid halide, an acid anhydride, a sulfonic acid halide, and an isocyanate. The reaction product forming the coating is preferably a silicate compound having at least one bond selected from the group consisting of an amide bond, a sulfonamide bond, a urethane bond, and a urea bond, and/or a hydrolysis product thereof.

Core particles produced in situ or introduced as preformed core particles are coated with a layer of carbon. Non-carbon as well as some carbon-based core materials can be utilized. The resulting carbon coated particles can find applications in rubber products, for instance as reinforcement for tire components.

Method for manufacturing a composite material combining a metal oxide or metalloid based matrix suited for allowing light to pass, and a mineral pigment dispersed in the matrix, the method comprising a step of mixing the mineral pigment in powder form with the matrix in powder form, and a step of sintering of the mixture under sufficient pressure such that the densification temperature of the matrix under said pressure is below the breakdown temperature of the mineral pigment, where the sintering temperature is greater than or equal to the densification temperature of the matrix and below the breakdown temperature of the mineral pigment.

Process for the surface treatment of a titanium dioxide pigment, characterized in that it comprises the following steps: an aqueous suspension of titanium dioxide pigments is formed, in a first step, a layer of alumina phosphate is precipitated on the surface of the pigment, in a second step, a layer of alumina is precipitated over the first layer of alumina phosphate, and in a third step, a layer of magnesium oxide and alumina is precipitated on the layer of alumina. Also included are titanium dioxide pigments made by the disclosed process and method using said pigments in paper manufacturing.