High solids aqueous mineral and/or filler and/or pigment suspension in acidic pH environment

Patent metadata

Field	Value
Publication number	US-9328222-B2
Application number	US-201314406585-A
Country	US
Kind code	B2
Filing date	Jun 7, 2013
Priority date	Jun 28, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

The present invention relates to high solids aqueous mineral and/or filler and/or pigment suspensions in acidic pH environment, to a method for producing such high solids aqueous mineral and/or filler and/or pigment suspension to the use of the high solids aqueous mineral and/or filler and/or pigment suspension in paper making, paper coating, plastic, agricultural and/or paint applications and as filler in paper and to a coating color formulation comprising the high solids aqueous mineral and/or filler and/or pigment suspension.

First claim

The invention claimed is:

1. A high solids aqueous mineral and/or filler and/or pigment suspension in acidic pH environment comprising:
a) at least one calcium carbonate-containing material comprising calcium carbonate-containing particles, and
b) at least one salt of at least one strong acid, wherein the at least one strong acid forming the at least one salt of at least one strong acid is selected from the group consisting of acids having a pK a value of less than or equal to zero at +23° C.,
wherein the high solids aqueous suspension has
i) a solids content of at least 50 wt.-%, based on the total weight of the high solids aqueous suspension,
ii) a Brookfield viscosity at 100 rpm of ≦1000 mPas at a temperature of −5° C.,
iii) a pH of <6 at +23° C., and
iv) a conductivity of between 10 and 100 mS/cm at −5° C. and at +23° C.

2. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the calcium carbonate-containing particles of the at least one calcium carbonate-containing material are selected from among natural calcium carbonate, precipitated calcium carbonate or mixtures thereof.

3. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the calcium carbonate-containing particles of the at least one calcium carbonate-containing material have a weight median particle size d 50 from 0.1 to 50 μm.

4. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the calcium carbonate-containing particles of the at least one calcium carbonate-containing material have a weight median particle size d 50 from 0.3 to 5 μm.

5. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the calcium carbonate-containing particles of the at least one calcium carbonate-containing material have a specific surface area of from 0.1 m 2 /g to 200 m 2 /g measured using nitrogen and the BET method.

6. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the calcium carbonate-containing particles of the at least one calcium carbonate-containing material have a specific surface area of from 0.1 m 2 /g to 50 m 2 /g measured using nitrogen and the BET method.

7. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the calcium carbonate-containing particles of the at least one calcium carbonate-containing material have a specific surface area of from 0.1 m 2 /g to 20 m 2 /g measured using nitrogen and the BET method.

8. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension comprises the at least one calcium carbonate-containing material in an amount of at least 50 wt.-% based on the total weight of the high solids aqueous suspension.

9. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension comprises the at least one calcium carbonate-containing material in an amount of from 50 to 82 wt.-% based on the total weight of the high solids aqueous suspension.

10. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the at least one calcium carbonate-containing material comprises at least one comb polymer.

11. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the surface of the calcium carbonate-containing particles of the at least one calcium carbonate-containing material are coated with at least one comb polymer.

12. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the at least one calcium carbonate-containing material comprises at least one comb polymer having an intrinsic viscosity in the range of 5 to 99 ml/g.

13. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the at least one calcium carbonate-containing material comprises at least one comb polymer having an intrinsic viscosity in the range of 10 to 80 ml/g.

14. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the at least one salt of at least one strong acid comprises a divalent and/or trivalent cation.

15. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 14 , wherein the divalent cation is selected from the group consisting of calcium, magnesium, strontium and mixtures thereof.

16. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 14 , wherein the trivalent cation is aluminum.

17. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the at least one salt of at least one strong acid comprises a divalent and a trivalent cation, wherein the divalent cation is selected from the group consisting of calcium, magnesium, strontium and mixtures thereof, and wherein the trivalent cation is aluminum.

18. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the at least one strong acid forming the at least one salt of at least one strong acid is selected from the group consisting of hydrochloric acid, nitric acid and mixtures thereof.

19. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension comprises at least one comb polymer in an amount from 0.01 to 5 wt.-% based on the total dry weight of the calcium carbonate-containing material in the suspension.

20. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension comprises at least one comb polymer in an amount from 0.1 to 3 wt.-% based on the total dry weight of the calcium carbonate-containing material in the suspension.

21. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has solids content from 50 to 82 wt.-% based on the total weight of the high solids aqueous suspension.

22. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has solids content from 60 to 78 wt.-% based on the total weight of the high solids aqueous suspension.

23. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has a Brookfield viscosity at 100 rpm from 25 to 1,000 mPas at a temperature of −5° C.

24. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has a Brookfield viscosity at 100 rpm from 25 to 700 mPas at a temperature of −5° C.

25. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has a Brookfield viscosity at 100 rpm from 25 to 500 mPas at a temperature of −5° C.

26. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has a Brookfield viscosity at 100 rpm from 50 to 300 mPas at a temperature of −5° C.

27. The high solids aqueous mineral and/or filler and/or pigment suspension of claim 1 , wherein the high solids aqueous suspension has a pH of between 4 and <6 at +23° C.

28. The high solids aqueous mineral

Assignees

• Omya Int Ag

Inventors

• Buri Matthias
• Rentsch Samuel
• Gane Patrick A C

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · 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

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title