Abstract: The invention relates to a make-up composition. This composition is characterised in that it comprises a polymer or mixture of polymers selected from the family of hydroxylated polydimethylsiloxanes or non-hydroxylated polydimethylsiloxanes, and of their mixtures, and which has a viscoelasticity and a viscosity which are well determined, in order to enable the formation of drops on keratin fibres, said polymer or mixture of polymers being dispersed in a volatile solvent, said composition not containing any product having a viscoelasticity-modifying effect, which can prevent the formation of said drops at the concentration used. The invention enables drops, which are preferably transparent, to be formed at the tips of keratin fibres, particularly eyelashes or the hair.

Abstract: The invention relates to a process for the preparation of a stable microdispersion of particles comprised of acrylic polymers in an organic solvent used as reaction medium in the presence of a stabilizing agent comprised of a block copolymer, characterized in that said acrylic polymer is obtained by radical polymerization of at least one acrylic monomer in the presence of a block copolymer based on polymethyl methacrylate (PMMA) and polytert-butyl acrylate (PtBuA). It also relates to microdispersions which may be obtained by said process as well as to microgels produced from said microdispersions and compositions, particularly cosmetic compositions such as nail varnish.