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A method for preparing fine precipitated calcium carbonate having a large surface area and a polymer composition filled with a substance containing calcium carbonate
A method for preparing fine precipitated calcium carbonate having a large surface area and a polymer composition filled with a substance containing calcium carbonate
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机译:一种制备具有大表面积的细沉淀碳酸钙的方法以及填充有包含碳酸钙的物质的聚合物组合物
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摘要
This invention concerns a process for the preparation of large surface area, finely divided precipitated calcium carbonate which comprises introducing carbon dioxide into an aqueous slurry of greater than about five weight percent calcium hydroxide containing an anionic organopolyphosphonate polyelectrolyte, starting the introduction at a temperature above about 7 DEG C and below about 18 DEG C, continuing the introduction until calcite precipitation is substantially complete and adding a quantity of polybasic acid to the slurry in an amount greater than about 0.3% by weight of the precipitated calcium carbonate. This invention also concerns said large surface area, finely divided precipitated calcium carbonate which has been coated with a fatty acid derivative and polymeric compositions which contain such coated calcium carbonate.
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