Method for preparing a masterbatch of diene elastomer and silica
AssigneesCompagnie Generale Des Establissements Michelin, Michelin Recherche et Technique S.A.
InventorsBenoit De Gaudemaris, Geraldine Laffargue, Julien Berriot
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Abstract
Preparation of a masterbatch of diene elastomer and silica including preparing at least one silica dispersion in water; bringing into contact and mixing an elastomer latex and the aqueous silica dispersion in the presence of a metal salt having an at least divalent metal element, in order to obtain a coagulum; and recovering the coagulum and drying same in order to obtain the masterbatch. The metal cation molar ration, defined as the number of moles of metal cations of the metal salt per BET unit area of the silica, is between 9.375*10−7 and 1.875*10−5 mol/m2.
Claims19
A method for preparing a masterbatch of diene elastomer and silica comprising:
- preparing at least one dispersion of silica in water,
- bringing into contact and mixing an elastomer latex and the aqueous silica dispersion in the presence of an at least divalent aluminium salt, thereby obtaining a coagulum,
- recovering the coagulum,
- drying the recovered coagulum, thereby obtaining a masterbath;
- wherein molar content of metal cations, defined as the number of moles of aluminium cations of the metal salt per unit of silica surface area, is between 1.15×10−6 and 5×106 mol/m2.
Dependencies are inferred from the claim text.