The invention relates to an aqueous composition comprising a suspension of ZnO particles and a polymer stabiliser containing carboxylic acid functions and carboxylic acid salt functions.

An inorganic pigment which is treated with at least one non-reactive polysiloxane of the general Formula I

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In general Formula I, R.sup.1 to R.sup.8 are the same or different and are selected from C.sub.mH.sub.2m+1, wherein m is ≤10, and fluorinated derivatives thereof wherein at least one hydrogen atom is replaced by fluorine, C.sub.6H.sub.5, and (EO).sub.x(PO).sub.y and copolymers thereof, wherein EO is an oxyethylene unit, PO is an oxypropylene unit, x and y are the same or different, and x+y is in the range of 1 to 50. The at least one non-reactive polysiloxane has a viscosity in the range of 50-3000 mm.sup.2×s.sup.−1 at 25° C. The inorganic pigment treated with the at least one non-reactive polysiloxane of general Formula I has a residual moisture content of less than 1 wt-%.

A product for incorporating ultraviolet radiation protection and antimicrobial protection into a synthetic polymer is disclosed which has a quantity of zinc oxide particles modified with a layer of a reactive group that forms a bond with a quantity of synthetic polymer chips having C—H bonds. A product for incorporating ultraviolet radiation protection and antimicrobial protection into a synthetic polymer prior to forming a synthetic material is also disclosed which has a quantity of synthetic polymer chips and a quantity of zinc oxide particles modified with a layer of a reactive group that forms a bond with the quantity of the synthetic polymer chips.

A method for producing oxide particles with controlled color characteristics and to provide oxide particles with controlled color characteristics includes controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH), in oxide particles selected from metal oxide particles and metalloid oxide particles. Oxide particles having controlled color characteristics of any one of reflectance, transmittance, molar absorption coefficient, hue, or color saturation can be provided by controlling the percentage of the M-OH bonds contained in metal oxide particles or metalloid oxide particles.

Porous metal oxide microspheres are prepared via a process comprising forming a liquid solution or dispersion of polydisperse polymer nanoparticles and a metal oxide; forming liquid droplets from the solution or dispersion; drying the liquid droplets to provide polymer template microspheres comprising polymer nanospheres and metal oxide; and removing the polymer nanospheres from the template microspheres to provide the porous metal oxide microspheres. The porous microspheres exhibit saturated colors and are suitable as colorants for a variety of end-uses.

Provided is a filler that has a low viscosity when mixed in a resin material and has reduced permittivity and dielectric loss tangent. The filler includes: a metal oxide particle material; and a polyorganosiloxane compound with which a surface treatment is performed on the metal oxide particle material and which is represented by general formula (1): (RO).sub.3Si—(SiR.sub.2—O—).sub.n—SiR.sub.3 (in general formula (1), each R is independently selected from among alkyl groups having 1 to 4 carbon atoms, and n is not less than 10 and not greater than 200). A resin composition obtained by containing the filler in a resin is suitable for an electronic material.

A composition comprising: an organosilane having formula (I) (I) X-A-Z, wherein X is —SiR.sup.4.sub.nR.sup.2.sub.(3-n) wherein each R.sup.4 is independently OR.sup.1 or halogen, wherein each R.sup.1 in independently hydrogen or C.sub.1-4 hydrocarbyl and each R.sup.2 is independently C.sub.1-4 hydrocarbyl, and n is from 1 to 3, A is C.sub.1-10 hydrocarbylene, wherein the backbone of the hydrocarbylene is substituted with one or more oxygen atoms, one or more nitrogen atoms, or carbonyl, Z is a sugar group, a monoglycerol group, a diglycerol group, a polyglycerol group, or a xylitol group, and wherein the composition is a personal care composition, surface treating composition, an antifog composition, a coating composition, a surface treated powder, a paint composition, or an ink composition.

With an aim to provide an oxide particle with controlled color characteristics, the present invention provides a method for producing an oxide particle, wherein the color characteristics of the oxide particle are controlled by controlling a M-OH bond/M-O bond ratio, which is a ratio of a M-OH bond between an element (M) and a hydroxide group (OH) to a ratio of an M-O bond between the element (M) and oxygen (O), where the element (M) is one or plural different elements other than oxygen or hydrogen included in the oxide particle selected from metal oxide particles and semi-metal oxide particles. According to the present invention, by controlling the M-OH bond/M-O bond ratio of the metal oxide particle or the semi-metal oxide particle, the oxide particle with controlled color characteristics of any of reflectance, transmittance, molar absorption coefficient, hue, and saturation can be provided.

Porous metal oxide microspheres are prepared via a process comprising forming a liquid dispersion of polymer nanoparticles and a metal oxide; forming liquid droplets of the dispersion; drying the droplets to provide polymer template microspheres comprising polymer nanospheres; and removing the polymer nanospheres from the template microspheres to provide the porous metal oxide microspheres. The porous microspheres exhibit saturated colors and are suitable as colorants for a variety of end-uses.

For the cosmetic field, omniphobic cosmetic pigments under the form of a core shell structure: the core is or includes of a metal oxide on which is adsorbed poly(β-(1.fwdarw.4)-D-glucosamine) chains; the chains being acetylated, or partially or totally deacetylated. Also, the process for manufacturing the omniphobic cosmetic pigments, including: (i) preparing an acidic aqueous solution including metal oxide particles and a poly (β-(1.fwdarw.4)-D-glucosamine), the poly (β-(1.fwdarw.4)-D-glucosamine) being acetylated, or partially or totally deacetylated; and (ii) increasing the pH until 12, of the solution obtained at step (i) in order to obtain the adsorption of said poly (β-(1.fwdarw.4)-D-glucosamine on the metal oxide particles and the precipitation of the resulting metal oxide particles coated with the poly (β-(1.fwdarw.4)-D-glucosamine.