Cross-linked microparticles, method for the production and use thereof

Crosslinked microparticles between 10 and 300 nm in size, obtained by dispersion polymerization, in a non-aqueous medium which is a non-solvent for the polymer formed, starting with a composition of ethylenically unsaturated polymerization compounds, wherein the composition of the ethylenically unsaturated compounds comprises:

• at least one monomer A, comprising only one ethylenic unsaturation which can undergo radical-mediated polymerization, giving the microparticles formed in the non-aqueous medium self-stabilization during and after polymerization, without any addition of polymer having the function of a stabilizing agent, either before, during or after polymerization,
• at least one compound B comprising at least two ethylenic unsaturations which can undergo radical-mediated polymerization, the compound B being different from an allylic(meth)acrylate and, optionally:
• at least one compound C comprising only one ethylenic unsaturation which can undergo radical-mediated polymerization, which is different from A and/or
• at least one compound D which is different from A, B and C and comprising at least one ethylenic unsaturation which can undergo radical-mediated polymerization and at least one second reactive function f1 which is other than an ethylenic unsaturation.