Dry grinding a mineral carbonate material, useful to make micro particulate calcium carbonate i.e. useful to prepare e.g. filler, comprises dry grinding the material in a grinding unit in the presence of polyalkylene glycol polymer

摘要

Dry grinding a mineral carbonate material comprises dry grinding the material in a grinding unit in the presence of a polyalkylene glycol polymer (I) having ethylene- and/or propylene oxides at 90 wt.%, preferably 98 wt.% and in the presence of water, where grinding unit comprises the material at less than 10 dry wt.%; optionally separating the dry ground material using a separating unit; and optionally repeating the above steps. (I) has a molecular weight of 400 g/mol. An independent claim is included for a micro particulate calcium carbonate (A) obtained by the process.