| 摘要 |
A process for the preparation of a low density, substantially water-insoluble, particulate material which comprises forming an aqueous slurry containing precipitated calcium carbonate and optionally a dissolved alkali metal polyphosphate, and treating said slurry to heating and mechanical processing steps to provide a particulate material having a particle size of -50 to +170 mesh (U.S. Standard Sieve), and a particle density of no more than 1.0 g/ml. and a resistance against breakdown in water; and a low density, substantially water-insoluble, calcium carbonate containing, particulate material prepared by such process.
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