METHOD FOR PREPARING A MASTERBATCH OF DIENE ELASTOMER AND SILICA

摘要

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.

主权项

1. 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 a metal salt comprising an at least divalent metal element, thereby obtaining a coagulum, recovering the coagulum, drying the recovered coagulum, thereby obtaining a masterbatch; wherein the molar content of metal cations, defined as the number of moles of metal cations of the metal salt per unit of silica surface area, is between 9.3×10−7 and 1.875×10−5 mol/m2.