Precipitated calcium carbonate pigment, especially for use in inkjet printing paper coatings
AssigneeOmya International AG
InventorsMichael Kaessberger, Michael Pohl
Life of this patent
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Abstract
The invention relates to novel and innovative PCC pigments, able to be used in a paper coating formulations to manufacture coated “multipurpose” papers, in particular for inkjet applications, whose print qualities would be identical or quite similar to high resolution commercial papers, while maintaining a reduced paper manufacturing and production cost. Said pigments are obtained by a carbonation process using a reduced flow rate of CO2/air, which leads to porous agglomerates of PCC of a very specific structure and unique properties, followed by an upconcentration step leading to substantially the same agglomerates but with a higher, appropriate, solids content.
Claims21
A precipitated calcium carbonate (PCC) product comprising porous spherical aggregates/agglomerates having a mean aggregate diameter of 1 to 5 μm and a specific surface area of 30-100 m2/g, wherein the porousrical aggregates/agglomerates consist of ultrafine calcium carbonate particles bound together to form the porous spherical aggregates/agglomerates, and wherein the ultrafine calcium carbonate particles have a primary acicular particle size of 20 to 50 nm, and an aspect ratio of between 1:2 and 1:10.
Dependencies are inferred from the claim text.