Coarse pigment addition and high solids slurries for higher coating colour concentrations

Patent metadata

Field	Value
Publication number	US-9840624-B2
Application number	US-201715401348-A
Country	US
Kind code	B2
Filing date	Jan 9, 2017
Priority date	Sep 21, 2009
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

The present invention relates to an aqueous slurry comprising natural ground calcium carbonate which has a percentage P 5 by weight of particles having a diameter of less than 5.0 μm of from 98.5% to 90%, a percentage P 2 by weight of particles having a diameter of less than 2.0 μm of from 96% to 80%, wherein the ratio of P 2 /P 5 is from 0.98 to 0.85, and wherein the slurry has a solids content of more than 78 wt %.

First claim

The invention claimed is:

1. A paper coating, paper, paint, plastic, concrete or sealant comprising natural ground calcium carbonate which has a percentage P 5 by weight of particles having a diameter of less than 5.0 μm of from 98.5% to 90% and 1.5 to 10% by weight of particles having a diameter greater than 5.0 μm, a percentage P 2 by weight of particles having a diameter of less than 2.0 μm of from 96% to 80% and 4.0 to 20% by weight of particles having a diameter greater than 2.0 μm, wherein the ratio of P 2 /P 5 is from 0.98 to 0.85.

2. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , wherein the natural ground calcium carbonate is obtained from marble, limestone, chalk, or any mixture thereof.

3. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , wherein the natural ground calcium carbonate has a percentage P 1 by weight of particles having a diameter of less than 1.0 μm of from 88% to 60%.

4. The paper coating, paper, paint, plastic, concrete or sealant according to claim 3 , wherein the ratio of P 1 /P 5 is from 0.75 to 0.65.

5. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , wherein the natural ground calcium carbonate has a percentage P 1 by weight of particles having a diameter of less than 1.0 μm of from 88% to 60%, and the ratio of P 1 /P 5 is from 0.75 to 0.65.

6. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , wherein the natural ground calcium carbonate contains a first fraction having a percentage P 5 (F1) by weight of particles having a diameter of less than 5.0 μm of from 75% to 85% and a median particle diameter d 50 of from 2.0 to 3.0 μm, and a second fraction having a percentage P 2 (F2) by weight of particles having a diameter of less than 2.0 μm of from 85% to 100% and a median particle diameter d 50 of from 0.3 to 0.65 μm.

7. The paper coating, paper, paint, plastic, concrete or sealant according to claim 6 , wherein the ratio of the median particle diameter d 50 of the first fraction to the median particle diameter d 50 of the second fraction is at least 3.5.

8. The paper coating, paper, paint, plastic, concrete or sealant according to claim 6 , wherein the weight ratio of the first fraction to the second fraction is from 5/95 to 20/80.

9. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , wherein the percentage P 5 by weight of particles having a diameter of less than 5.0 μm is from 98% to 93% and 2 to 7% by weight of particles having a diameter greater than 5.0 μm.

10. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , wherein the percentage P 5 by weight of particles having a diameter of less than 5.0 μm is from 98% to 90% and 2 to 10% by weight of particles having a diameter greater than 5.0 μm.

11. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , which is a paper coating.

12. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , which is paper.

13. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , which is paint.

14. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , which is concrete.

15. The paper coating, paper, paint, plastic, concrete or sealant according to claim 1 , which is a sealant.

Assignees

• Omya Int Ag

Inventors

• Bluvol Guillermo
• Kässberger Michael
• Gane Patrick A C

Classifications

• D21H21/52

  Additives of definite length or shape · CPC title

• C01F11/185

  After-treatment, e.g. grinding, purification, conversion of crystal morphology · CPC title

• D21H19/40

  siliceous, e.g. clays · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title