The present invention relates to a method of preparing a transparent polymer material, comprising the following steps: i) mineral nanoparticles, chosen from alkaline-earth metal carbonate, alkaline-earth metal sulphate, metal oxide, metalloid oxide and siloxane nanoparticles, are mixed with a composition A comprising at least one thermoplastic polymer in the molten state chosen from polycarbonate (PC), polystyrene (PS) and polymethyl methacrylate (PMMA), in order to obtain a masterbatch, the mixture resulting from step i) comprising at least 25% and at most 75% by weight of said mineral nanoparticles; and ii) the masterbatch obtained from i) is mixed with a composition B comprising a thermoplastic polycarbonate matrix (mPC) in the molten state, so as to obtain a transparent polymer material comprising at most 10% by weight of said mineral nanoparticles, preferably at most 5% by weight of said mineral nanoparticles.

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