# US 11,104,778 B2 · Talc particulate and uses thereof

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- Number: US 11,104,778 B2
- Document ID: US11104778B2
- Status: Granted
- Kind: B2
- Application number: 15/507,535
- Filed: 2015-08-25
- Published: 2017-10-05
- Granted: 2021-08-31
- Earliest claimed: 2014-09-01
- Assignees: Imertec SAS
- Applicants: Imerys Talc Europe
- Inventors: Jean-Sebastien Mas; Jerome Crepin-Leblond
- Web page: https://patentgrep.com/patent/US11104778B2

## CPC

- C08K 3/34: Silicon-containing compounds
- C01B 33/22: Magnesium silicates
- C08K 3/346: {Clay}
- C08K 9/00: Use of pretreated ingredients
- C08K 9/04: Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)}
- C09C 1/28: Compounds of silicon {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)}
- C01P 2002/22: layered hydroxide-type, e.g. of the hydrotalcite-type
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/54: Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
- 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
- C08K 2201/003: Additives being defined by their diameter
- C08K 2201/005: Additives being defined by their particle size in general
- C08K 2201/006: Additives being defined by their surface area
- C08K 2201/016: Additives defined by their aspect ratio
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- 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}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

There is disclosed a talc particulate having a d50 of from about 0.5 to 5.0 μm and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm and a shape factor equal to or greater than about 40. A process for making the talc particulate is also disclosed. The talc particulate may be used in polymer compositions as a filler from which polymer composites and articles may be formed.

## Claims

### Claim 1

A processed talc particulate having a d50 of from about 0.5 to 5.0 μm, having a shape factor equal to or greater than about 40, having a d95 from 7.0 to 12.0 μm, having a steepness equal to or greater than 30.0, and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm.

### Claim 2 (depends on 1)

The talc particulate according to claim 1 comprising less than about 250 ppm of particles having a particle size of equal to or greater than about 45 μm.

### Claim 3 (depends on 1)

The talc particulate according to claim 1 having:
a lamellarity index of from about 2.8 to about 45.0, and
a shape factor equal to or greater than 70 and no greater than 150.

### Claim 4 (depends on 3)

The talc particulate according to claim 3 having a specific surface area (BET) of from about 10 m2/g to about 20 m2/g.

### Claim 5 (depends on 4)

The talc particulate according to claim 4 which is surface treated with a surface treatment agent.

### Claim 6 (depends on 1)

The talc particulate according to claim 1 having a lamellarity index of from about 2.8 to about 45.0.

### Claim 7 (depends on 1)

The talc particulate according to claim 1 having a shape factor equal to or greater than 70 and no greater than 150.