| 摘要 |
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 5μm, at least 70% by weight of smaller than 2μm, and at least 20% by weight of smaller than 1μm, with a weight average particle size within a range of from 0.7 to 3μm.
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