Nail varnish containing microgels

A method for modifying the physical properties of a nail varnish composition comprising an organic solvent having at most 1% water and an effective amount of a nail varnish pigment by incorporating at least one microgel in said nail varnish composition, said microgel being a three-dimensional, cross-linked polymer having a diameter less than about 100 nm when in particulate form in a non-swollen state, said microgel resulting from polymerization in an emulsion or dispersion of a monofunctional main monomer and a difunctional monomer acting as a cross-linking agent, said main monomer being an acrylic monomer, methacrylic monomer, styrenic monomer, or vinylic ester monomer having a C1 to C18 alkyl group, and said difunctional monomer being a diacrylic or dimethacrylic monomer, or a difunctional aromatic monomer, and not being obtained from an acrylic polymer microdispersion prepared by a radical polymerisation of at least one acrylic monomer in the presence of a poly(methylmethacrylate (PMMA)- and poly(tert-butyl acrylate) (PtBuA)-based block copolymer.

Nail varnish comprising an organic solvent having at most 1% water, at least one microgel, said microgel being a three-dimensional, cross-linked polymer having a diameter less than about 100 nm when in particulate form in a non-swollen state, said microgel resulting from polymerization in an emulsion or dispersion of a monofunctional main monomer and a difunctional monomer acting as a cross-linking agent, said main monomer being an acrylic monomer, methacrylic monomer, styrenic monomer, or vinylic ester monomer having a C1 to C18 alkyl group, and said difunctional monomer being a diacrylic or dimethacrylic monomer, or difunctional aromatic monomer, and not being obtained form an acrylic polymer microdispersion prepared by a radial polymerisation of at least one acrylic monomer in the presence of a poly(methylmethacrylate) (PMMA)- and poly(tert-butylacrylate) (PtBuA)-based block copolymer and an effective amount of a nail varnish pigment, said microgel being present in an effective amount to obtain a nail varnish having a dry extract comprised between 20 and 50% by weight of said varnish.

A one-coat nail varnish comprising an organic solvent having at most 1% water, at least one microgel, said microgel being a three-dimensional, cross-linked polymer having a diameter less than about 100 nm when in particulate form in a non-swollen state, said microgel resulting from polymerization in an emulsion or dispersion of a monofunctional main monomer and a difunctional monomer acting as a cross-linking agent, said main monomer being an acrylic monomer, methacrylic monomer, styrenic monomer, or vinylic ester monomer having a C1 to C18 alkyl group, and said difunctional monomer being a diacrylic or dimethacrylic monomer, or a difunctional aromatic monomer, and not being obtained from an acrylic polymer microdispersion prepared by a radical polymerisation of at least one acrylic monomer in the presence of a poly(methylmethacrylate) (PMMA)- and poly(tertbutylacrylate (PtBuA)-based block copolymer and an effective amount of a nail varnish pigment, said microgel being present in an effective amount to obtain a nail varnish having a dry extract comprised between 30 and 50% by weight of said varnish.