# US 11,111,389 B2 · Composite particles having hydrophilic and hydrophobic surface coatings

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- Number: US 11,111,389 B2
- Document ID: US11111389B2
- Status: Granted
- Kind: B2
- Application number: 15/990,113
- Filed: 2018-05-25
- Published: 2018-11-29
- Granted: 2021-09-07
- Earliest claimed: 2017-05-26
- Assignees: Gebruder Dorfner GmbH & Co. Kaolin- und Kristallquarzsand-Werke KG
- Applicants: Gebrüder Dorfner GmbH & Co. Kaolin- und Kristallquarzsand-Werke KG
- Inventors: Michael Flierl; Marco Süß; Reinhard Kräuter
- Web page: https://patentgrep.com/patent/US11111389B2

## CPC

- C09C 1/3054: {Coating}
- C08K 3/36: Silica
- C08K 3/40: Glass
- C08K 9/02: Ingredients treated with inorganic substances
- C09C 3/043: {Drying, calcination}
- C09C 3/063: {Coating}
- C01P 2002/60: Compounds characterised by their crystallite size
- C01P 2004/84: one phase coated with the other
- C08K 2201/005: Additives being defined by their particle size in general
- 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}
- 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

## Abstract

The invention relates to composite particles, comprising a carrier particle and an at least partial surface coating, the carrier particle comprising a quartz and a layered silicate and the surface of the composite particle having at least one hydrophilic region and at least one hydrophobic region. The invention also relates to a method for producing composite particles, comprising the steps: a) providing carrier particles, comprising a quartz and a layered silicate, b) introducing the carrier particles into a mixing device, c) charging the carrier particles with a coating composition, d) coating the carrier particles with the coating composition by mixing the carrier particles with the coating composition, with the introduction of shear energy, e) subjecting the coated carrier particles to temperature. In addition, the invention relates to a mineral cast part or to a composite workpiece which comprises the above-described composite particles.

## Claims

### Claim 1

A composite particle, comprising a carrier particle and an at least partial surface coating covering at least part of the carrier particle,
characterised in that the carrier particle comprises a hydrophilic surface region comprising quartz and wherein the carrier particle further comprises a hydrophobic surface region comprising a layered silicate, and wherein the surface of the composite particle has at least one hydrophilic region and at least one hydrophobic region wherein quartz and layered silicate are present, grown together, to form the carrier particle.

### Claim 2 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating is a hydrophilic surface coating which comprises a soluble glass.

### Claim 3 (depends on 1)

The composite particle according to claim 1, characterised in that the layered silicate has a composition of the type
DodnHex2-3[Tet4O10]X2.mH2O
where “Dod” are 12-times coordinated cations, “Hex” are 6-times coordinated cations, “Tet” are 4-times coordinated cations and “X” are anions, “n” is within a range of from 0.35 to 1 and “m” is within a range of from 0 to 24.

### Claim 4 (depends on 1)

The composite particle according to claim 1, characterised in that it has a grain size (D50, sedigraph) of between 10 and 1000 μm.

### Claim 5 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating is a hydrophilic surface coating which is present in a mass percentage of less than 10%, based on the total mass of the composite particle.

### Claim 6 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating comprises a pigment which is present in a mass percentage of less than 5%, based on the total mass of the composite particle.

### Claim 7 (depends on 1)

The composite particle according to claim 1, characterised in that it has a grain size (D50, sedigraph) of between 25 and 500 μm.

### Claim 8 (depends on 1)

The composite particle according to claim 1, characterised in that it has a grain size (D50, sedigraph) of between 50 and 200 μm.

### Claim 9 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating is a hydrophilic surface coating which is present in a mass percentage of less than 8%, based on the total mass of the composite particle.

### Claim 10 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating is a hydrophilic surface coating which is present in a mass percentage of 0.1-5%, based on the total mass of the composite particle.

### Claim 11 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating comprises a pigment which is present in a mass percentage of less than 4%, based on the total mass of the composite particle.

### Claim 12 (depends on 1)

The composite particle according to claim 1, characterised in that the surface coating comprises a pigment which is present in a mass percentage of 0.01-3%, based on the total mass of the composite particle.

### Claim 13 (depends on 1)

A mineral cast part or composite workpiece, characterised in that it comprises composite particles according to claim 1.