NOVELTY - Preparing thermotropic particles for doping polymer matrices, comprises (a) providing an organic phase containing at least one monomers and/or at least one organic solvent, (b) providing an aqueous phase containing at least one surfactant and/or at least one surface-active compound, (c) preparing a dispersion of the aqueous phase and the organic phase by mixing the two phases, (d) optionally adding at least one initiator to start the polymer formation, and (e) performing the polymer formation to form spherical particle cores.    USE - The method is useful for preparing thermotropic particles for doping polymer matrices, where the doped polymers are useful for sun protection and shadowing (all claimed).    ADVANTAGE - The method allows economical preparation of the thermotropic particles with high yield and less consumption of energy and without increasing the thermal stress.    DETAILED DESCRIPTION - Preparing thermotropic particles for doping polymer matrices, comprises (a) providing an organic phase containing at least one monomers for a polymer formation and/or at least one organic solvent, (b) providing an aqueous phase containing at least one surfactant and/or at least one surface-active compound, (c) preparing a dispersion of the aqueous phase and the organic phase by mixing the two phases, (d) optionally adding at least one initiator to start the polymer formation, (e) performing the polymer formation to form spherical particle cores, (f) performing the polymer formation for the installation of anchor groups different from a spherical arrangement in a surface of the particle cores and (g) isolating the thermotropic particles. INDEPENDENT CLAIMS are included for:    (1) the thermotropic particle for doping the polymeric matrix with the spherical particle cores, where the polymeric matrix comprises anchor groups different from the spherical arrangement in the surface of the particle cores, an interfacial tension of the anchor groups extending from the surface tension of the polymer matrix is maximum 25 m/Nm, preferably maximum 5 m/Nm, and the particles are prepared in accordance with the method; and    (2) doped polymers comprising the polymer matrix with the thermotropic particles.