| abstract |
The application concerns a method for impregnating at least one particle of at least partially cross-linked polymethyl methacrylate with a colouring agent, said method comprising the steps consisting of: a) introducing a colouring agent and at least one particle of at least partially cross-linked polymethyl methacrylate into a reactor, then b) placing the colouring agent and the at least one particle of at least partially cross-linked polymethyl methacrylate in contact with a fluid in a subcritical or supercritical condition for a period sufficient to impregnate the at least one particle of at least partially cross-linked polymethyl methacrylate with the colouring agent, with the proviso that, if water is present in the reactor, the ratio by weight of water to particle(s) of at least partially cross-linked polymethyl methacrylate is less than 1, the obtained particle or particles impregnated with colouring agent, and a cosmetic composition, in particular for make-up, comprising same. |