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.

Provided are compositions and methods that are useful for hair care compositions. The compositions comprise polyurethane microparticles coated with zinc salt particles, wherein the ratio of zinc salt to polyurethane is in a range of from 1:99 to 3:7, and the polyurethane microparticles have an average particle size of less than 100 microns. Also provided are methods of preparation of such compositions.

The present invention relates to a composite particle comprising: at least one hydrophilic core particle; and a plurality of hydrophobic particles, wherein the surface of the hydrophilic core particle is substantially discontinuously covered by the hydrophobic particles. The novel composite particle according to the present invention can have surface active properties sufficient to prepare stable Pickering emulsions, and can maintain the surface active properties over a long period of time. The present invention also relates to a method for preparing the above composite particle.

The present invention is directed to a personal care composition is disclosed comprising: a detersive surfactant from about 2% to 50%; an anti-dandruff active; a cationic polymer; a zinc-containing layered material wherein the zinc-containing layered material has a particle size in the range of from about 0.5 um to 4 um; wherein the ratio of silicone deposition to crystalline structurant deposition is greater than about 5.

A method of producing efficiently and stably core-shell type oxide particles, wherein the entire surface of the core oxide particles is uniformly coated with the shell oxide, includes at least two steps of: Step 1 of precipitating the core oxide particles in a mixed fluid prepared by mixing an oxide raw material liquid for core and an oxide precipitation solvent and Step 2 of coating the entire surface of the core oxide particles uniformly with the shell oxide by mixing the mixed fluid and an oxide raw material liquid for shell. (A) At least Steps 1 and 2 are performed continuously between at least two processing surfaces 1 and 2 which are capable of approaching to and separating from each other, at least one of which rotates relatively to the other; (B) after Step 1, Step 2 is completed within a prescribed time during which the core oxide particles do not aggregate in the mixed fluid; or (C) Step 1 and Step 2 are controlled so that the primary particle diameter of the core-shell type oxide particles is 190% or less relative to the primary particle diameter of the core oxide particles.

Ultraviolet radiation sun protective compositions are reported which feature micronized metal oxide inorganic particles selected from zinc oxide, titanium dioxide and mixtures thereof, the inorganic particles being coated with an adduct of a hydroxy cinnamate and a silanol, amounts of the adduct to the inorganic particles being in a relative weight ratio of 1:200 to 1:4.

The present invention relates to a method for increasing sun protection factor (SPF) of a sunscreen composition, use of porous metal oxide spheres (e.g., microspheres) for increasing SPF of a sunscreen composition and preparation of sunscreen compositions comprising the porous spheres.

The present invention relates to the cosmetic use of porous spheres comprising a metal oxide for improving the appearance and/or comfort of the skin, skin integuments, notably the hair, and/or mucous membranes. The invention also relates to a cosmetic or pharmaceutical composition comprising said spheres.

The present invention relates to the cosmetic use of porous spheres comprising a metal oxide for improving the appearance and/or comfort of the skin, skin integuments, notably the hair, and/or mucous membranes. The invention also relates to a cosmetic or pharmaceutical composition comprising said spheres.

A black aluminum pigment comprises a flaky aluminum particle; and a coating film that covers the aluminum particle, the coating film comprises a titanium oxide layer and an amorphous silicon compound layer, the titanium oxide layer has a composition that satisfies TiO.sub.x (0.50≤x≤1.90), and the amorphous silicon compound layer is composed of at least one of silicon oxide, silicon hydroxide, and silicon hydrate.