PROCESS FOR THE PREPARATION OF PRECIPITATED SILICAS, PRECIPITATED SILICAS AND THEIR USES, IN PARTICULAR FOR THE REINFORCEMENT OF POLYMERS

摘要

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein a mixture of polycarboxylic acids is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.

主权项

1. A process for the production of precipitated silica, the process comprising:
reacting at least one silicate with at least one acidifying agent, to provide a silica suspension; submitting said silica suspension to filtration to provide a filter cake; submitting said filter cake to a liquefaction step, said liquefaction step being carried out in the absence of an aluminium compound, to obtain a suspension of precipitated silica; and optionally, drying the precipitated silica obtained after the liquefaction step;wherein a mixture of polycarboxylic acids is added to the filter cake during or after the liquefaction step.