초록 ▼

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 desire

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.

대표청구항 ▼

What we claim is: 1. 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 minera

What we claim is: 1. 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. 2. The pigment mixture of claim 1, wherein said colloidal PCC has a BET surface area of 15-50 m2/g. 3. The pigment mixture of claim 2, wherein said colloidal PCC has a BET surface area of 20-30 m2/g. 4. A combination of the pigment mixture of claim 3 and non-colloidal PCC. 5. A combination of the pigment mixture of claim 2 and non-colloidal PCC. 6. The pigment mixture of claim 1, wherein said colloidal PCC comprises aggregates/agglomerates having an equivalent spherical particle size in the range of 0.5-3.0 mm, and wherein said aggregates/agglomerates consist of single crystals having an equivalent spherical particle size of 0.01-0.50 mm. 7. The pigment mixture of claim 6, wherein said colloidal PCC comprises aggregates/agglomerates having an equivalent spherical particle size in the range of 0.2-4.0 mm. 8. The pigment mixture of claim 7, wherein said colloidal PCC comprises aggregates/agglomerates having an equivalent spherical particle size in the range of 0.5-3.0 mm. 9. A combination of the pigment mixture of claim 8 and non-colloidal PCC. 10. A combination of the pigment mixture of claim 7 and non-colloidal PCC. 11. A combination of the pigment mixture of claim 6 and non-colloidal PCC. 12. A combination of the pigment mixture of claim 1 and non-colloidal PCC.