Novel inorganic pigment containing calcium carbonate, aqueous suspension containing same, and uses thereof

  • US 20060162884A1
  • Filed: 03/17/2004
  • Published: 07/27/2006
  • Est. Priority Date: 03/18/2003
  • Status: Active Grant
First Claim
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1. A mineral pigment containing calcium carbonate characterized in that it contains a product formed in situ by the double and/or multiple reaction between a calcium carbonate and the reaction product or products of the said carbonate with gaseous CO2 formed in situ and/or coming from an external supply, and the reaction product or products of the said carbonate with one or more moderately strong to strong H3O+ ion donors and at least one aluminium silicate and/or at least one synthetic silica and/or at least one calcium silicate and/or at least one silicate of a monovalent salt such as sodium silicate and/or potassium silicate and/or lithium silicate, preferably such as sodium silicate and/or at least one aluminium hydroxide and/or at least one sodium and/or potassium aluminate, and in that it contains less than 0.1% by weight silicate of a monovalent salt such as sodium, potassium or lithium silicate or mixtures thereof, preferably such as sodium silicate, relative to the dry weight of the calcium carbonate, and characterized in that it has a pH greater than 7.5 measured at 20°

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