Patent ID: 11872294
Assignee: IMERTECH SAS
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  B  C  D | IPC A  B  C  D

Claim 0:
1. A process, comprising:
preparing an aqueous carbonate slurry comprising calcium carbonate particles;
adding at least one silicate composition to the aqueous carbonate slurry to obtain a carbonate-silicate slurry;
lowering a pH of the carbonate-silicate slurry by adding at least one acidic compound to obtain a pH-adjusted slurry comprising silica-coated calcium carbonate particles; and
isolating the silica-coated calcium carbonate particles,
wherein:
the silicate composition comprises a silica and a metal oxide;
a molar ratio of the silica to the metal oxide in the silicate composition ranges from 1.1:1 to 5:1;
the adding of the at least one acidic compound is controlled such that a final pH of the pH-adjusted slurry ranges from about 7 to about 10;
the silica-coated calcium carbonate particles comprise a porous coating having an average pore diameter ranging from 2 nm to 50 nm; and
the acidic compound is a water-soluble carboxylic acid.