# US 11,304,883 B2 · Polished talc microbeads

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- Number: US 11,304,883 B2
- Document ID: US11304883B2
- Status: Granted
- Kind: B2
- Application number: 16/339,814
- Filed: 2016-10-14
- Published: 2019-10-10
- Granted: 2022-04-19
- Earliest claimed: 2016-10-14
- Assignees: Mondo Minerals B.V.
- Applicants: Mondo Minerals B.V.
- Inventors: Jose Manuel De Barros Sanches; Tomasz Wasilewski; Anna Maria Kanios-Zakrzewska
- Web page: https://patentgrep.com/patent/US11304883B2

## CPC

- A61K 8/25: Silicon; Compounds thereof
- A61K 8/0241: {Containing particulates characterized by their shape and/or structure (see also A61K8/04, A61K8/11, and A61K8/14, further aspects are classified in A61K2800/40 and subcodes)}
- A61K 8/442: {substituted by amido group(s)}
- A61K 8/447: {containing sulfur}
- A61K 8/466: {containing sulfonic acid derivatives; Salts}
- A61Q 11/00: Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
- A61Q 19/10: Washing or bathing preparations
- C01B 33/22: Magnesium silicates
- A61K 2800/28: Rubbing or scrubbing compositions; Peeling or abrasive compositions; Containing exfoliants
- A61K 2800/41: Particular ingredients further characterized by their size
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- C01P 2004/02: obtained by optical microscopy
- C01P 2004/60: Particles characterised by their size
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Polished talc microbeads, i.e. polished talc particles with a largest average diameter of less than 500 μm and methods for the preparation thereof, which microbeads are especially suitable to be use as an alternative for plastic microbeads used in cosmetics and personal hygiene products. Body scrubs, tooth pastes and soaps comprising the present polished talc microbeads. The use of polished talc microbeads with a talc content of more than 70% (w/w) and a largest diameter of less than 500 μm as a substitute for plastic microbeads in cosmetics and personal hygiene products.

## Claims

### Claim 1

A liquid soap consisting of:
(a) spherical and smooth talc microbeads in an amount of 1% to 5% (w/w);
(b) surfactant; and
(c) water;
wherein the talc microbeads have a talc content of at least 75% (w/w); and the largest diameter of the talc microbeads is 500 μm or less.

### Claim 2 (depends on 1)

The liquid soap of claim 1, wherein the largest diameter of the talc microbeads is between 250 μm and 500 μm.

### Claim 3 (depends on 1)

The liquid soap of claim 1, wherein the largest diameter of the talc microbeads is between 125 μm and 250 μm.

### Claim 4 (depends on 1)

The liquid soap of claim 1, wherein the largest diameter of the talc microbeads is between 0.5 μm and 125 μm.

### Claim 5 (depends on 1)

The liquid soap of claim 1, wherein the amount of surfactant is between 1% and 15% (w/w).

### Claim 6

A dry soap consisting of:
(a) spherical and smooth talc microbeads in an amount of at least 50% (w/w); and
(b) surfactant;
wherein the talc microbeads have a talc content of at least 75% (w/w); and the largest diameter of the talc microbeads is 500 μm or less.

### Claim 7 (depends on 6)

The dry soap of claim 6, wherein the largest diameter of the talc microbeads is between 250 μm and 500 μm.

### Claim 8 (depends on 6)

The dry soap of claim 6, wherein the largest diameter of the talc microbeads is between 125 μm and 250 μm.

### Claim 9 (depends on 6)

The dry soap of claim 6, wherein the largest diameter of the talc microbeads is between 0.5 μm and 125 μm.

### Claim 10 (depends on 6)

The dry soap of claim 6, wherein the amount of surfactant is at least 15% (w/w).