Process for manufacturing calcium carbonate materials having a particle surface with improved adsorption properties

Patent metadata

Field	Value
Publication number	US-9896567-B2
Application number	US-201313868527-A
Country	US
Kind code	B2
Filing date	Apr 23, 2013
Priority date	Dec 4, 2008
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The invention relates to a process for manufacturing calcium carbonate materials having a particle surface with improved adsorption properties of dispersant, using at least one lithium ion-containing compound, the calcium carbonate material obtained by this process, the use of the calcium carbonate materials in paper, paints and plastics, as well as the use of the lithium ion-containing compounds in the manufacturing process.

First claim

The invention claimed is:

1. A calcium carbonate material comprising (i) calcium carbonate; (ii) a totally neutralized polyacrylic acid dispersing agent, (iii) 0.0035 wt % to 1 wt %, based on the total dry weight of the calcium carbonate material, of at least one lithium ion containing compound selected from the group consisting of lithium hydroxide, lithium oxide, an inorganic monomeric lithium salt, an organic monomeric lithium salt, lithium carbonate, a lithium sulphate, lithium citrate, lithium hydrogen carbonate, lithium acetate, lithium chloride, a lithium phosphate, and any mixture thereof, and (iv) water, wherein the calcium carbonate material has a solids content of 45 to 82 wt. %, and wherein the totally neutralized polyacrylic acid dispersing agent is not the lithium ion containing compound.

2. The calcium carbonate material according to claim 1 , wherein the lithium ion concentration is from 10 to 2000 ppm based on the total dry weight of the calcium carbonate material.

3. The calcium carbonate material according to claim 1 , wherein the lithium ion concentration is from 100 to 1000 ppm based on the total dry weight of the calcium carbonate material.

4. The calcium carbonate material according to claim 1 , wherein the lithium ion concentration is from 200 to 800 ppm based on the total dry weight of the calcium carbonate material.

5. The calcium carbonate material according to claim 1 , which contains the at least one lithium ion-containing compound in an amount of from 0.0035 wt % to 0.5 wt %, based on the total dry weight of the calcium carbonate material.

6. The calcium carbonate material according to claim 1 , which contains the at least one lithium ion-containing compound in an amount of from 0.02 wt % to 0.2 wt %, based on the total dry weight of the calcium carbonate material.

7. The calcium carbonate material according to claim 1 , which has a d 50 of from 0.2 to 5 μm as determined using a Sedigraph 5100™.

8. The calcium carbonate material according to claim 1 , which has a d 50 of from 0.2 to 1.5 μm as determined using a Sedigraph 5100™.

9. The calcium carbonate material according to claim 1 , which has a d 50 of from 0.25 to 1 μm as determined using a Sedigraph 5100™.

10. The calcium carbonate material according to claim 1 , which has a d 50 of from 0.45 to 0.7 μm as determined using a Sedigraph 5100™.

11. The calcium carbonate material according to claim 1 , which comprises a fraction of particles finer than 1 μm of more than 50 wt %, based on the total weight of ground material.

12. The calcium carbonate material according to claim 1 , which comprises a fraction of particles finer than 1 μm of more than 80 wt %, based on the total weight of ground material.

13. The calcium carbonate material according to claim 1 , which comprises a fraction of particles finer than 1 μm of more than 85 wt %, based on the total weight of ground material.

14. The calcium carbonate material according to claim 1 , which comprises a fraction of particles finer than 1 μm of more than 90 wt %, based on the total weight of ground material.

15. The calcium carbonate material according to claim 1 , which comprises a fraction of particles finer than 1 μm of more than 95 wt %, based on the total weight of ground material.

16. The calcium carbonate material according to claim 1 , which has a scattering coefficient S of ≧120 m 2 /kg for a coating weight of 20 g/m 2 and a Brookfield™ viscosity of <1000 mPa·s.

17. The calcium carbonate material according to claim 1 , which has a scattering coefficient S of ≧140 m 2 /kg for a coating weight of 20 g/m 2 and a Brookfield™ viscosity of <500 mPa·s.

18. The calcium carbonate material according to claim 1 , having a Brookfield™ viscosity after 1 hour of production of below 2000 mPa·s measured for one minute of stirring at 21° C. at a rotation speed of 100 rpm, and a Brookfield™ viscosity after 8 days of unstirred storage of below 2000 mPa·s measured for one minute of stirring at 21° C. at a rotation speed of 100 rpm.

19. The calcium carbonate material according to claim 1 , wherein the inorganic monomeric lithium salt or the organic monomeric lithium salt is a lithium monovalent acid salt or a lithium polyvalent acid salt.

20. Paper comprising the calcium carbonate material according to claim 1 .

21. A plastic comprising the calcium carbonate material according to claim 1 .

22. A paint comprising the calcium carbonate material according to claim 1 .

Assignees

• Gane Patrick A C
• Buri Matthias
• Karth Beat
• Pudack Claudia
• Omya Int Ag

Inventors

• Gane Patrick A C
• Buri Matthias
• Karth Beat
• Pudack Claudia

Classifications

• D21H19/385

  Oxides, hydroxides or carbonates · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• D21H17/69

  modified, e.g. by association with other compositions prior to incorporation in the pulp or paper · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• D21H17/675

  Oxides, hydroxides or carbonates · CPC title