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AssigneeOmya International AG
InventorsChristian Rainer, Michael Pohl
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An object of the present invention is to provide a process to obtain a calcium carbonate material comprising GCC and PCC, with a specific steepness factor (defined as d30/d70×100, where dx is the equivalent spherical diameter relative to which x % by weight of the particles are finer) of at least about 30, preferably of at least about 40, and most preferably of at least about 45, in a cost efficient manner, wherein GCC and PCC are co-ground, possibly with at least another mineral material. An other object of the present invention lies in the the obtained co-ground calcium carbonate material in the form of an aqueous suspension and in the form of a dry product. An other object of the present invention lies in the uses of such products in any sector making use of mineral materials, and notably in the paper, paint and plastic industries.
Process of manufacturing co-ground calcium carbonate material comprising GCC and PCC, presenting a steepness factor of at least about 30, preferably of at least about 40, and most preferably of at least about 45, and characterised in that it comprises the steps of:
Co-ground calcium carbonate material comprising GCC and PCC, characterised in that it is in the form of an aqueous suspension, presenting a steepness factor of at least about 30, preferably of at least about 40, and most preferably of at least about 45.
Co-ground calcium carbonate material comprising GCC and PCC, characterised in that it is in the form of a dry product, presenting a steepness factor of at least about 30, preferably of at least about 40, and most preferably of at least about 45.
Dependencies are inferred from the claim text.