A porous particle, wherein the porous particle has a mass median aerodynamic diameter and a volume average particle diameter that satisfy expression: y≥2x, where x denotes the mass median aerodynamic diameter and y denotes the volume average particle diameter, and the porous particle has a relative span factor (R.S.F) that satisfies expression: 0<(R.S.F)≤1.5.

Hair spray compositions comprising a liquid carrier, hollow, fluid-filled microspheres, a polymer fixative, and propellant are provided.

Silica-including microcapsule resin particles including an outer shell constituted of a crosslinked polymer and a cavity partitioned with the outer shell, in which the silica-including microcapsule resin particles contain inside the cavity a porous structure in which silica particles are mutually connected, and have a volume average particle diameter of 0.5 to 100 μm.

The porous-cellulose particles according to the present invention are constituted by gathered crystalline celluloses having a type I crystal form including a glucose molecule as a constitutional unit. That is, porous-cellulose particles having high sphericity have been achieved from a natural raw material. The porous-cellulose particles have an average particle diameter of 0.5 to less than 50 μm, a specific surface area of 50 to 1000 m.sup.2/g, and a sphericity of 0.85 or more. Cosmetic products containing such porous-cellulose particles have excellent texture properties.

Disclosed herein are topical compositions for the administration of active agents. The compositions can comprise zeolite nanoparticles dispersed in a topically acceptable carrier. The zeolite nanoparticles can further comprise an effective amount of an active agent adsorbed on the zeolite nanoparticles, encapsulated within the zeolite nanoparticles, or a combination thereof. Also provided sunscreen agents and antimicrobial agents, as well as compositions comprising sunscreen agents and antimicrobial agents.

A composition for stably preparing a hollow particle by a coacervation method, a hollow particle prepared using a composition for preparing a hollow particle, and a method of preparing a hollow particle are disclosed. A mono-disperse hollow particle is stably provided by excellent coacervate forming capability, such that it is expected to be beneficially used as a carrier in various fields such as a cosmetic, a paint, plastic, rubber, a synthetic wood, a refractory material, and an agricultural chemical.

The present invention provides a cosmetic shaped product: which is substantially formed with relatively low-molecular-weight hyaluronic acid or a water-soluble salt thereof having a high penetrability into the skin; which is easily soluble to water; and which has satisfactory handling properties, and a method for producing the cosmetic shaped product. There is provided a cosmetic shaped product being a sponge-like shaped body formed with at least one polyanionic polysaccharide of hyaluronic acid and a water-soluble salt thereof each having an average molecular weight of 30,000 or lower, the sponge-like shaped body having a bulk specific gravity of 5 to 500 mg/mL. This cosmetic shaped product can be produced by freeze-drying an aqueous solution having a content of the polyanionic polysaccharide of 0.5 to 30% by mass.

The present invention relates to a particle composition comprising XRD amorphous calcium magnesium phosphate particles and a method for manufacturing such a composition. The XRD amorphous calcium magnesium phosphate particles are spherical particles with a hollow core. The particle-containing paste may be used in dental products such as toothpaste to treat dentin hypersensitivity by mineralizing and occluding exposed dentin tubules.

A process for producing porous particles of a polyhydroxyalkanoate (PHA) includes the following steps: providing a spray drying atomization chamber heated to an operating temperature comprised between 50° C. and 300° C.; providing an aqueous suspension having the PHA and an expanding agent which decomposes at the operating temperature of the atomization chamber, with the formation of at least one gaseous compound; and injecting the aqueous suspension into the atomization chamber provided at the operating temperature, so as to cause instantaneous evaporation of the aqueous suspension and decomposition of the expanding agent, with formation of the porous PHA particles. The particles obtained from said process can be used to obtain cosmetic compositions that are soft to the touch, with high oil absorbing capacities and high flow index, able to generate a uniform, filling effect for wrinkles and skin furrows, making the skin more glossy and compact.

The invention relates to a microcapsule comprising a hollow or porous core, the hollow or porous core being composed of a crosslinked polymeric material and containing a component to be released, a shell, the shell being composed of a polymeric material containing a component, which is able to produce gas upon exposure to acid. The microcapsule can be used for formulating dental materials.