Preparation of coating dispersions

Details Preparation of coating dispersions Preparation of coating dispersions

D - Textiles, Paper

21

H

D21H 19/38 (2006.01) C01F 11/18 (2006.01) C09C 1/02 (2006.01) D21H 21/52 (2006.01)

Patent

CA 2691057

The invention relates to a process for the preparation of coating dispersions for use in the paper industry by co-grinding natural calcium carbonate (GCC) and precipitated calcium carbonate (PCC), characterized in that powdery GCC is co-ground with a slurry containing from 5 to 70% by weight of PCC to obtain a particle size distribution of the calcium carbonate with at least 90% by weight of smaller than µm, at least 70% by weight of smaller than 2 µm, and at least 20% by weight of smaller than 1 µm, with a weight average particle size within a range of from 0.7 to 3 µm.

L'invention concerne un procédé de production de dispersions de couchage, destinées à être utilisées dans l'industrie du papier, par cobroyage de carbonate de calcium naturel (GCC) et de carbonate de calcium précipité (PCC). Ledit procédé se caractérise en ce que du GCC pulvérulent est cobroyé avec une pâte contenant entre 5 et 70% en poids de PCC pour obtenir une répartition granulométrique du carbonate de calcium d'au moins 90% en poids inférieure à 5 µm, d'au moins 70% en poids inférieure à 2 µm et d'au moins 20% en poids inférieure à 1 µm, avec une moyenne rectifiée des dimensions particulaires de l'ordre de 0,7 à 3 µm.

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