A nano-particulate composition comprising nano-particulate capsule comprising at least one or more of hydrophobic core material and a polymeric shell comprising homo-polymer or copolymers of at least one ethylenically unsaturated monomers or mixture thereof and having particle size distribution with an average article size in the range of 50 to 1000 nm is provided together with a controlled release delivery system comprising fragrance release delivery system involving said nano-particulate capsule water based emulsion and a process of manufacture thereof. Said delivery system provided is able to protect and release the fragrance in a controlled manner over a period of time. The controlled release fragrance delivery system of the present invention finds advantageous end use and application in fragranced consumer products formulations including water based coating/paint formulations and industrial formulations for use in industries including textile, cosmetics, soaps and detergents, leather industries.

There is provided a method of producing silica capsules, the method comprising: adding a silica precursor to emulsified droplets in the presence of salt and alcohol to enhance silica growth around the emulsified droplets by an ion association effect, thereby forming silica capsules. Also provided are silica capsules producible by such a method.

The present invention relates to a process for preparing solid microcapsules comprising the following steps: a) preparation of a composition C1, which is either a composition C1a, comprising a single hydrophobic solid particle, or a composition C1b comprising a plurality of hydrophobic solid particles dispersed in a hydrophilic phase, b) addition with stirring of the composition C1 in a polymeric composition C2 at a temperature T.sub.b, whereby an emulsion (E1) is obtained; c) addition, with stirring, of the emulsion (E1) in a composition C3 at a temperature T.sub.c, whereby a double emulsion (E2) is obtained; d) applying a shear to the emulsion (E2), whereby a double emulsion (E3) is obtained; and e) polymerization of the composition C2, whereby solid microcapsules dispersed in the composition C3 are obtained.

A reflective material comprising a multilayered array of particles encapsulated by a matrix material, the reflective material defining a primary surface, the reflective material exhibiting: (i) visible retroreflection of incident radiation, wherein a wavelength of visible retroreflected radiation decreases from a first visible wavelength at a first angle to the primary surface to a second, shorter wavelength of visible retroreflected radiation as the viewing angle to the primary surface increases; and (ii) Bragg diffraction of the incident radiation, wherein the wavelength of radiation Bragg diffracted normal to the primary surface is longer than the wavelength of visible radiation, such that no visible radiation is retroreflected or Bragg diffracted in a direction normal to the primary surface.

A reflective material comprising a multilayered array of particles encapsulated by a matrix material, the reflective material defining a primary surface, the reflective material exhibiting: (i) visible retroreflection of incident radiation, wherein a wavelength of visible retroreflected radiation decreases from a first visible wavelength at a first angle to the primary surface to a second, shorter wavelength of visible retroreflected radiation as the viewing angle to the primary surface increases; and (ii) Bragg diffraction of the incident radiation, wherein the wavelength of radiation Bragg diffracted normal to the primary surface is longer than the wavelength of visible radiation, such that no visible radiation is retroreflected or Bragg diffracted in a direction normal to the primary surface.

A material in the form of solid particles with a diameter varying from 10 μm to 1 cm is provided, composed of a continuous solid shell having at least one silicon oxide, said shell imprisoning an aqueous phase The aqueous phase includes at least one hydrophilic substance of interest S.sub.H and at least one droplet of a fatty phase predominantly having a crystallizable oil in the solid state at the storage temperature of said material The crystallizable oil has a melting point (T.sub.M) of less than 100° C. and including at least one lipophilic substance of interest S.sub.L.

A material in the form of solid particles with a diameter varying from 10 μm to 1 cm is provided, composed of a continuous solid shell having at least one silicon oxide, said shell imprisoning an aqueous phase The aqueous phase includes at least one hydrophilic substance of interest S.sub.H and at least one droplet of a fatty phase predominantly having a crystallizable oil in the solid state at the storage temperature of said material The crystallizable oil has a melting point (T.sub.M) of less than 100° C. and including at least one lipophilic substance of interest S.sub.L.

A flowable, stable silica capsule formulation composed of a silica capsule suspension and an adjuvant for use in a personal care product, a beauty care product, a fabric care product, a home care product, a personal hygiene product, an oral care product is provided.

A flowable, stable silica capsule formulation composed of a silica capsule suspension and an adjuvant for use in a personal care product, a beauty care product, a fabric care product, a home care product, a personal hygiene product, an oral care product is provided.

A process for increasing the hydrophobicity of a porous product by treating the product, or a composition providing for the product, with a water repellent material, characterized in that the porous product or a composition providing the product, is treated with an aqueous suspension of microcapsules where the microcapsules comprise a water repellent organosilicon core material selected from an organosilane, a partially condensed organosilane and a branched siloxane resin, and a shell of a silicon-based network polymer comprising silica units.