# US 10,767,055 B2 · Mineral material powder with high dispersion ability and use of said mineral material powder

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- Number: US 10,767,055 B2
- Document ID: US10767055B2
- Status: Granted
- Kind: B2
- Application number: 14/372,603
- Filed: 2013-02-14
- Published: 2015-01-01
- Granted: 2020-09-08
- Earliest claimed: 2012-02-17
- Assignees: Omya International AG
- Applicants: Omya International AG
- Inventors: Pierre Blanchard; Jean-Pierre Elgoyhen; Beat Karth; Holger Müller; Jürgen Spehn; Martin Brunner; Pascal Gonnon; Michael Tinkl
- Web page: https://patentgrep.com/patent/US10767055B2

## CPC

- C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- B02C 23/36: the crushing or disintegrating zone being submerged in liquid
- C04B 14/28: of calcium
- C08K 3/26: Carbonates; Bicarbonates
- C08K 9/04: Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)}
- C09C 1/021: {Calcium carbonates}
- C09C 3/04: Physical treatment, e.g. grinding or treatment with ultrasonic vibrations {(C09C3/006 takes precedence)}
- D21H 17/00: Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H 17/63: Inorganic compounds
- D21H 17/66: Salts, e.g. alums
- D21H 17/67: Water-insoluble compounds, e.g. fillers, pigments
- D21H 17/675: {Oxides, hydroxides or carbonates}
- D21H 17/68: siliceous, e.g. clays
- D21H 19/38: characterised by the pigments
- D21H 19/385: {Oxides, hydroxides or carbonates}
- D21H 19/40: siliceous, e.g. clays
- D21H 21/52: Additives of definite length or shape
- C01P 2004/03: obtained by SEM
- 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 2006/60: Optical properties, e.g. expressed in CIELAB-values
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- Y10T 428/2991: Coated
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02})
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- 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}
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention refers to a mineral matter powder preparation by wet process without acrylic additive or other grinding aid additives and to the use of said mineral matter after an optional hydrophobic treatment. Said mineral material having superior dispersing properties.

## Claims

### Claim 1

A process for preparing a ground mineral material in the absence of a dispersing agent consisting of the steps of:
a) wet grinding mineral material in at least one grinding step in an aqueous suspension or slurry in the absence of a dispersing agent until the mineral material has a weight median particle diameter d50 from 1.1 μm to 1.5 μm, wherein the mineral material is selected from the group consisting of marble, chalk, dolomite, calcite, limestone, magnesium hydroxide, talc, gypsum, titanium oxide, and any mixture thereof;
b) up-concentrating or dewatering the aqueous suspension or slurry of step a) in the absence of a dispersing agent to achieve a solids content of between 50% and 70%;
c) drying the aqueous suspension or slurry of step a) or b) to achieve a solid content of 99.8%, wherein no dispersing agent is present in the mineral material so obtained; and
d) optionally surface treating the mineral material obtained in step c) with at least one aliphatic carboxylic acid; and
e) optionally de-agglomerating the mineral material after step d), wherein the calcium carbonate after grinding in step a) and before optional treatment in step d) has a BET/N2 specific area of from 3 m2/g to 13 m2/g, wherein the mineral material obtained in step c) has a top cut d98 of 1.8 μm-5.9 μm.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the mineral material is wet ground in step a) until the mineral material has a weight median particle diameter d50 of 1.1 μm.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the mineral material is wet ground in step a) until the mineral material has a weight median particle diameter d50 of 1.5 μm.

### Claim 4 (depends on 1)

The process according to claim 1, wherein in step b) the aqueous suspension or slurry is up-concentrated or dewatered to achieve a solids content of between 55% and 65%.

### Claim 5 (depends on 1)

The process according to claim 1, wherein in step b) the aqueous suspension or slurry is up-concentrated or dewatered to achieve a solids content of 60%.

### Claim 6 (depends on 1)

The process according to claim 1, further comprising a de-agglomeration step e) after step d).

### Claim 7 (depends on 1)

The process according to claim 1, wherein the mineral material is wet ground in step a) at a solids content of from 10 wt % to 40 wt %.

### Claim 8 (depends on 1)

The process according to claim 1, wherein the mineral material is wet ground in step a) at a solids content of from 20 wt % to 30 wt %, and step b) uses up-concentrating which is carried out by centrifugation.

### Claim 9 (depends on 1)

The process according to claim 1, wherein the mineral material is selected from the group consisting of marble, chalk, dolomite, calcite, limestone, and any mixture thereof.

### Claim 10 (depends on 1)

The process according to claim 1, wherein the up-concentrating of step b) is carried out by mechanical and/or thermal means.

### Claim 11 (depends on 1)

The process according to claim 1, wherein the drying in step c) is carried out by atomizing, spray drying, drying in a rotational oven, drying in a pond, jet-drying, fluid bed drying, freeze drying, fluidized spray drying, or fountain nozzle drying.

### Claim 12 (depends on 1)

The process according to claim 1, wherein the drying in step c) is carried out by spray drying.

### Claim 13 (depends on 1)

The process according to claim 1, wherein step d) takes place and the at least one aliphatic carboxylic acid is selected from the group consisting of butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nonadecanoic acid, arachidic acid, heneicosylic acid, behenic acid, lignoceric acid, and any mixture thereof.

### Claim 14 (depends on 1)

The process according to claim 1, wherein the mineral matter in step a) is calcium carbonate.