Use of colloidal PCC
AssigneeJ.M. Huber Corporation
InventorsKlaus Akilles Lunden, Ib Attrup, Jens Toftelund Madsen
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Abstract
The invention relates to a process for regulating the porosity and printing properties of paper, in particular uncoated wood-containing paper such as SC-paper, wherein a sufficient quantity of colloidal PCC having a BET surface area of 10-100 m2/g is used as a filler in the paper to achieve a desired porosity of the paper; as well as paper containing colloidal PCC as filler, and a pigment mixture suitable for paper manufacture and containing colloidal PCC.
Claims12
A pigment mixture suitable for paper manufacture and comprising colloidal PCC having a BET surface area of 10-100 m2/g in combination with at least one filler selected from the following pigments:
- kaolin, calcined kaolin, gypsum, chalk, ground marble, silicate-containing minerals, sulfate-containing minerals, oxide-containing minerals, carbonate-containing minerals, hydroxide-containing minerals, calcium sulfoaluminates, plastic particles and organic pigments, wherein said colloidal PCC comprises aggregates/agglomerates having an equivalent spherical particle size in the range of 0.1-5.0 mm, and wherein said aggregates/agglomerates consist of single crystals having an equivalent spherical particle size of 0.01-0.50 mm.
Dependencies are inferred from the claim text.