Essilor International (compagnie Generale D'optique)

Solvay Sa

Renault S.a.s.

Armines

Renault S.a.s.; Solvay Sa

Essilor International

Imerys Pcc France

Laure Meynie

Didier Sy

Alexandra Roos

Marc Lacroix

Karine Cavalier

Serge Bourbigot

Sophie Duquesne

Nathalie Cornet

Virginie Boucher

Jean-Francois Hochepied

Jose-Marie Lopez-Cuesta

Anne Christmann

A method of preparing a transparent polymer material includes mixing mineral nanoparticles selected from nanoparticles of alkaline-earth metal carbonates, alkaline-earth metal sulfates, metallic oxides, oxides of metalloids, and siloxanes, and a composition A including at least one thermoplastic polymer in the molten state selected from polycarbonate (PC), polystyrene (PS) and polymethyl methacrylate (PMMA) in order to obtain a master-batch, the mixture of step i) including at least 25% and at most 75% by weight of the mineral nanoparticles. The master-batch obtained in step i) is mixed with a composition B of a thermoplastic polycarbonate matrix (PCm) in the molten state, to obtain a transparent polymer material including at most 10% by weight of the mineral nanoparticles, preferably at most 5% by weight of the mineral nanoparticles.

Method of preparing a transparent polumer material comprising a thermoplastic polycarbonate and mineral nanoparticles

A method of preparing a transparent polymer material includes i) obtaining composite nanoparticles having mineral nanoparticles at least partially coated with at least one monomer and/or at least one polymer suitable for promoting physicochemical interactions at the interface between the mineral nanoparticles and a thermoplastic polycarbonate matrix, the mineral nanoparticles being surface-modified by the monomer and/or the polymer, either directly by grafting or directly by adsorption of the monomer and/or polymer onto the surface of the mineral nanoparticles; or via a coupling agent selected from a chlorosilane or an organosilane including a functional group that is capable of reacting by a radical pathway. The composite nanoparticles obtained in step i) are mixed with the thermoplastic polycarbonate matrix in the molten state to obtain the transparent polymer material.

Method of preparing a transparent polymer material comprising a thermoplastic polycarbonate and surface-modified mineral nanoparticles

The present invention provides a method of preparing a transparent polymer material, the method comprising steps i) and ii) in any order, the steps consisting in:

Method for preparing a transparent polymer material including mineral nanoparticles with a shape factor strictly higher than 1.0

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Paris, France

Laure Meynie