Patent ID: 8029897

Claim:
A dissymmetric particle of nanometric or mesoscopic size consisting of a first part, a second part, and a coupling agent, wherein: the first part consists of a single particle of an inorganic material A of a mineral oxide or a metal, of between 50 and 250 nm, and having an outer surface to which is adsorbed or covalently grafted the coupling agent; the second part consists of a single substantially spherical nodule of organic material B of a polymer of recurrent vinyl units, having an outer surface coupled to an outer surface of the first part by the coupling agent; and wherein the coupling agent is a methacryloylalkyltrialkoxysilane, or a macromonomer of the group consisting of hydroxycelluloses, polyvinylpyrrolidones, polyacrylic acids, and poly(polyvinyl) alcohols.