The present invention is directed to a process for producing an aqueous suspension of precipitated calcium carbonate, wherein a milk of lime is prepared by mixing water, a calcium oxide containing material, at least one water-soluble polymer having a molecular weight Mw in the range from 200 to 6500
The present invention is directed to a process for producing an aqueous suspension of precipitated calcium carbonate, wherein a milk of lime is prepared by mixing water, a calcium oxide containing material, at least one water-soluble polymer having a molecular weight Mw in the range from 200 to 6500 g/mol, and at least one slaking additive, and subsequently, the milk of lime is carbonated to form an aqueous suspension of precipitated calcium carbonate.
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1. A process for producing an aqueous suspension of precipitated calcium carbonate comprising the steps of: i) providing a calcium oxide containing material,ii) providing at least one water-soluble polymer having a molecular weight Mw in the range from 200 to 6500 g/mol, wherein the at least one pol
1. A process for producing an aqueous suspension of precipitated calcium carbonate comprising the steps of: i) providing a calcium oxide containing material,ii) providing at least one water-soluble polymer having a molecular weight Mw in the range from 200 to 6500 g/mol, wherein the at least one polymer has the chemical structure of formula (I) wherein n, m, and p are integers and at least one of n, m, or p is greater than zero and n+m+p is less than or equal to 70,R1 is H or CH3,R2 is H or CH3,R3 is —C(═O)—O—R4 or —C(═O)—NH—R4, wherein R4 is a C1 to C20 alkyl group, a C3 to C20 cycloalkyl group and/or a C6 to C30 aryl group, being optionally substituted with one or more sulfonate groups, and wherein the cycloalkyl group and/or the aryl group comprises one ring or several rings, which are linked to each other,R5 is H or CH3,R6 is H or CH3, andX is H and/or M, wherein M is Na, K, Li, Mg, and/or Ca, and wherein the structural units are arranged randomly, regularly and/or in blocks, iii) providing at least one slaking additive, wherein the at least one slaking additive is selected from the group consisting of organic acids, organic acid salts, sugar alcohols, monosaccharides, disaccharides, polysaccharides, gluconates, phosphonates, lignosulfonates, and mixtures thereof,iv) preparing a milk of lime by mixing water, the calcium oxide containing material of step i), the at least one polymer of step ii), and the at least one slaking additive of step iii), wherein the calcium oxide containing material and the water are mixed in a weight ratio from 1:1 to 1:12, andv) carbonating the milk of lime obtained from step iv) to form an aqueous suspension of precipitated calcium carbonate. 2. The process of claim 1, wherein the at least one polymer has the chemical structure of formula (II) wherein n, m, and p are integers and at least one of n, m, or p is greater than zero and n+m+p is less than or equal to 70,R1 is H or CH3,R2 is H or CH3,R3 is —C(═O)—O—R4 or —C(═O)—NH—R4, wherein R4 is a C1 to C20 alkyl group, a C3 to C20 cycloalkyl group and/or a C6 to C30 aryl group, being optionally substituted with one or more sulfonate groups, and wherein the cycloalkyl group and/or the aryl group comprises one ring or several rings, which are linked to each other, andX is H and/or M, wherein M is Na, K, Li, Mg, and/or Ca, and wherein the structural units are arranged randomly, regularly and/or in blocks. 3. The process of claim 1, wherein R1 is H and R5 is H. 4. The process of claim 1, wherein step iv) comprises the steps of: a1) mixing the at least one polymer of step ii) and the at least one slaking additive of step iii) with water, anda2) adding the calcium oxide containing material of step i) to the mixture of step a1). 5. The process of claim 1, wherein step iv) comprises the steps of: b1) mixing the calcium oxide containing material of step i), the at least one polymer of step ii), and the at least one slaking additive of step iii), andb2) adding water to the mixture of step b1). 6. The process of claim 1, wherein in step iv) the calcium oxide containing material of step i), the at least one polymer of step ii), the at least one slaking additive of step iii), and water are mixed simultaneously. 7. The process of claim 1, wherein in step iv) the calcium oxide containing material and the water are mixed in a weight ratio from 1:1 to 1:9. 8. The process of claim 1, wherein in step iv) the calcium oxide containing material and the water are mixed in a weight ratio from 1:2.5 to 1:6. 9. The process of claim 1, wherein in step iv) the calcium oxide containing material and the water are mixed in a weight ratio from 1:3 to 1:5. 10. The process of claim 1, wherein the at least one slaking additive is selected from the group consisting of sodium citrate, potassium citrate, calcium citrate, magnesium citrate, monosaccharides, disaccharides, polysaccharides, sucrose, sugar alcohols, meritol, citric acid, sorbitol, sodium salt of diethylene triamine pentaacetic acid, gluconates, phosphonates, sodium tartrate, sodium lignosulfonate, calcium lignosulfonate, and any mixture thereof. 11. The process of claim 1, wherein the at least one slaking additive is sodium citrate and/or saccharose. 12. The process of claim 1, wherein the milk of lime of step iv) has a Brookfield viscosity from 1 to 1000 mPa·s at 25° C. 13. The process of claim 1, wherein the milk of lime of step iv) has a Brookfield viscosity from 5 to 800 mPa·s at 25° C. 14. The process of claim 1, wherein the milk of lime of step iv) has a Brookfield viscosity from 10 to 600 mPa·s at 25° C. 15. The process of claim 1, wherein the suspension of PCC of step v) has a Brookfield viscosity of less than or equal to 1000 mPa·s at 25° C. 16. The process of claim 1, wherein the suspension of PCC of step v) has a Brookfield viscosity of less than or equal to 800 mPa·s at 25° C. 17. The process of claim 1, wherein the suspension of PCC of step v) has a Brookfield viscosity of less than or equal to 600 mPa·s at 25° C. 18. The process of claim 1, wherein the suspension of PCC of step v) has a solids content of at least 20 wt.-%, based on the total weight of the suspension. 19. The process of claim 1, wherein the suspension of PCC of step v) has a solids content of from 20 to 50 wt.-%, based on the total weight of the suspension. 20. The process of claim 1, wherein the suspension of PCC of step v) has a solids content of from 25 to 45 wt.-%, based on the total weight of the suspension. 21. The process of claim 1, wherein the suspension of PCC of step v) has a solids content of from 30 to 40 wt.-%, based on the total weight of the suspension. 22. The process of claim 1, wherein the at least one slaking additive is added in an amount from 0.01 to 2 wt.-%, based on the total amount of calcium oxide containing material. 23. The process of claim 1, wherein the at least one slaking additive is added in an amount from 0.05 to 1 wt.-%, based on the total amount of calcium oxide containing material. 24. The process of claim 1, wherein the at least one slaking additive is added in an amount from 0.06 to 0.8 wt.-%, based on the total amount of calcium oxide containing material. 25. The process of claim 1, wherein the at least one slaking additive is added in an amount from 0.07 to 0.5 wt.-%, based on the total amount of calcium oxide containing material. 26. The process of claim 1, wherein the water used in mixing step iv) has a temperature that is adjusted to be in the range from more than 0° C. and less than 100° C. 27. The process of claim 1, wherein the water used in mixing step iv) has a temperature that is adjusted to be in the range from 1° C. to 70° C. 28. The process of claim 1, wherein the water used in mixing step iv) has a temperature that is adjusted to be in the range from 2° C. to 50° C. 29. The process of claim 1, wherein the water used in mixing step iv) has a temperature that is adjusted to be in the range from 30° C. to 50° C. 30. The process of claim 1, wherein the water used in mixing step iv) has a temperature that is adjusted to be in the range from 35° C. to 45° C. 31. The process of claim 1, wherein the milk of lime obtained from step iv), which is employed in step v), has a temperature that is adjusted to be in the range from 20° C. to 60° C. 32. The process of claim 1, wherein the milk of lime obtained from step iv), which is employed in step v), has a temperature that is adjusted to be in the range from 30° C. to 50° C. 33. The process of claim 1, wherein the milk of lime is screened after step iv) and before step v). 34. The process of claim 1, wherein the milk of lime is screened after step iv) and before step v) with a screen having a sieve size from 100 to 300 μm. 35. A process for producing precipitated calcium carbonate comprising the steps i) to v) of the process according to claim 1, and further a step vi) of separating the precipitated calcium carbonate from the aqueous suspension obtained from step v). 36. The process of claim 35, wherein the precipitated calcium carbonate is a dried precipitated calcium carbonate, and the process further comprises a step vii) of drying the separated precipitated calcium carbonate obtained from step vi). 37. The process of claim 36, wherein the dried precipitated calcium carbonate is a dried powder of precipitated calcium carbonate.
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이 특허에 인용된 특허 (4)
Tsukisaka Ryogo (Takarazuka JPX) Kondo Satoshi (Nishinomiya JPX) Kaneguchi Toshio (Kobe JPX) Deguchi Takashi (Nishinomiya JPX), Calcium carbonate, calcium carbonate pigment, process for preparing same, coating composition for information recording.
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