# US 10,501,634 B2 · High solids precipitated calcium carbonate with cationic additive

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- Number: US 10,501,634 B2
- Document ID: US10501634B2
- Status: Granted
- Kind: B2
- Application number: 15/544,968
- Filed: 2016-02-19
- Published: 2018-01-18
- Granted: 2019-12-10
- Earliest claimed: 2015-02-27
- Assignees: Omya International AG
- Applicants: Omya International AG
- Inventors: Marc Maurer; Holger Spiegel; Christian Jacquemet
- Web page: https://patentgrep.com/patent/US10501634B2

## CPC

- C09C 1/021: {Calcium carbonates}
- C01F 11/183: {the additive being an organic compound}
- C08K 3/26: Carbonates; Bicarbonates
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2006/12: Surface area
- C01P 2006/22: Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
- C01P 2006/82: water content
- C01P 2006/90: Other properties not specified above
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- Y02P 20/582: Recycling of unreacted starting or intermediate materials
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to a process for producing an aqueous suspension of precipitated calcium carbonate, an aqueous suspension of precipitated calcium carbonate and a precipitated calcium carbonate obtained by the process, a process comprising the precipitated calcium carbonate and its use.

## Claims

### Claim 1

A process for producing an aqueous suspension of precipitated calcium carbonate comprising the steps of:
i) providing a calcium oxide containing material, the calcium oxide containing material having a minimum calcium oxide content of at least 75 wt.-%, based on the total weight of the calcium oxide containing material,
ii) providing at least one cationic polymer comprising monomer units, the at least one cationic polymer being a quaternized ammonium compound which consists of monomer units, the monomer units each being a quaternized ammonium compound,
iii) preparing a milk of lime by mixing water, the calcium oxide containing material of step i), and the at least one cationic polymer of step ii) to obtain a milk of lime, wherein the calcium oxide containing material and the water are mixed in a weight ratio from 1:1 to 1:5, and wherein the at least one cationic polymer is present in an amount from 0.01 to 0.5 wt.-%, based on the total weight of the calcium oxide containing material, and
iv) carbonating the milk of lime obtained in step iii) to form an aqueous suspension of precipitated calcium carbonate.

### Claim 2 (depends on 1)

The process of claim 1, wherein step iii) comprises the steps of:
a1) mixing the at least one cationic polymer of step ii) with water, and a2) adding the calcium oxide containing material of step i) to the mixture of step a1); or
b1) mixing the calcium oxide containing material of step i), and the at least one cationic polymer of step ii), and b2) adding water to the mixture of step b1); or
c) mixing the calcium oxide containing material of step i), the at least one cationic polymer of step ii) and water simultaneously.

### Claim 3 (depends on 1)

The process of claim 1, wherein the process further comprises step v) of adding at least one slaking additive to process step iii).

### Claim 4 (depends on 3)

The process of claim 3, 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.

### Claim 5 (depends on 1)

The process of claim 1, wherein the milk of lime obtained in step iii) has a Brookfield viscosity from 1 to 1,000 mPa·s at 25° C.; and/or the suspension of PCC obtained in step iv) has a Brookfield viscosity of less than or equal to 1,600 mPa·s at 25° C.

### Claim 6 (depends on 1)

The process of claim 1, wherein the milk of lime obtained in step iii) has a Brookfield viscosity from 10 to 500 mPa·s at 25° C.; and/or the suspension of PCC obtained in step iv) has a Brookfield viscosity of less than or equal to 1,400 mPa·s at 25° C.

### Claim 7 (depends on 1)

The process of claim 1, wherein the milk of lime obtained in step iii) has a solids content from 20 to 38 wt.-%, based on the total weight of the suspension.

### Claim 8 (depends on 1)

The process of claim 1, wherein the suspension of PCC obtained in step iv) has a solids content from 24 to 42 wt.-%, based on the total weight of the suspension.

### Claim 9 (depends on 1)

The process of claim 1, wherein the temperature of the water, which is used in mixing step iii), is adjusted to be in the range from more than 0° C. and less than 100° C.; and/or the temperature of the milk of lime obtained in step iii), which is employed in step iv), is adjusted to be in the range from 20° C. to 60° C.

### Claim 10 (depends on 1)

The process of claim 1, wherein the calcium oxide containing material is calcium oxide.

### Claim 11 (depends on 1)

The process of claim 1, wherein the at least one cationic polymer is:
a) a homopolymer based on monomer units selected from the group consisting of vinyl-based dialkyl ammonium compounds, allyl-based dialkyl ammonium compounds, diallyldimethyl ammonium chloride (DADMAC), diallyldiethyl ammonium chloride (DADEAC), diallyldimethyl ammonium bromide (DADMAB), diallyldiethyl ammonium bromide (DADEAB); vinyl-based trialkyl ammonium compounds, [2-(acryloyloxy)ethyl]trimethylammonium chloride (AETAC), [2-(acryloyloxy)ethyl]trimethylammonium methosulfate (AETAMS), 3-(acrylamidopropyl)-trimethylammonium chloride (APTAC), 3-(acrylamidopropyl)-trimethylammonium methosulfate (APTAMS); allyl-based trialkyl ammonium compounds, 2-(methacryloyloxy)-ethyltrimethylammonium chloride (MADQUAT), 2-(methacryloyloxy)-ethyltrimethylammonium methosulfate (METAMS), 3-(methacryloyloxy)-propyltrimethylammonium chloride or 3-(methacrylamidopropyl)-trimethylammonium chloride (MAPTAC), 3-(methacrylamidopropyl)-trimethylammonium methosulfate (MAPTAMS), or
b) a copolymer based on monomer and comonomer units selected from the group consisting of vinyl-based dialkyl ammonium compounds, allyl-based dialkyl ammonium compounds, diallyldimethyl ammonium chloride (DADMAC), diallyldiethyl ammonium chloride (DADEAC), diallyldimethyl ammonium bromide (DADMAB), diallyldiethyl ammonium bromide (DADEAB); vinyl-based trialkyl ammonium compounds, [2-(acryloyloxy)ethyl]trimethylammonium chloride (AETAC), [2-(acryloyloxy)ethyl]trimethylammonium methosulfate (AETAMS), 3-(acrylamidopropyl)-trimethylammonium chloride (APTAC), 3-(acrylamidopropyl)-trimethylammonium methosulfate (APTAMS); allyl-based trialkyl ammonium compounds, 2-(methacryloyloxy)-ethyltrimethylammonium chloride (MADQUAT), 2-(methacryloyloxy)-ethyltrimethylammonium methosulfate (METAMS), 3-(methacryloyloxy)-propyltrimethylammonium chloride or 3-(methacrylamidopropyl)-trimethylammonium chloride (MAPTAC), 3-(methacrylamidopropyl)-trimethylammonium methosulfate (MAPTAMS).

### Claim 12 (depends on 1)

The process of claim 1, wherein the at least one cationic polymer is a homopolymer selected from poly(diallyldimethyl ammonium chloride) (pDADMAC) and poly(2-(methacryloyloxy)-ethyltrimethylammonium chloride) (pMADQUAT), or a copolymer based on monomer units selected from 2-(methacryloyloxy)-ethyltrimethylammonium chloride (MADQUAT) and comonomer units selected from 3-(methacrylamidopropyl)-trimethylammonium chloride (MAPTAC).

### Claim 13 (depends on 1)

The process of claim 1, wherein the at least one cationic polymer has a specific viscosity in the range from 1.2 to 15.0; and/or a has a positive charge density in the range of from >0 μVal/g to +15 μVal/g.

### Claim 14 (depends on 1)

The process of claim 1, wherein the process further comprises a step of separating the precipitated calcium carbonate from the aqueous suspension obtained in step iv).

### Claim 15 (depends on 1)

The process of claim 1, wherein the calcium oxide containing material has a minimum calcium oxide content of at least 90 wt.-%, based on the total weight of the calcium oxide containing material.