US-12622850-B2 - Use of zeolite powders in cosmetic formulations

Abstract

The present invention refers to synthetic lipophilic zeolites powder for the preparation of cosmetic compositions.

Inventors

• Paolo Vacca
• Miriam RIVA
• Katarzyna FIDECKA
• Stefano Zilio

Assignees

• SAES GETTERS S.P.A.

Dates

Publication Date

20260512

Application Date

20240308

Priority Date

20230315

Claims (9)

1. 1 . A method of using zeolite powders to texturize a cosmetic composition, comprising incorporating a zeolite powder in a cosmetic composition, wherein said zeolite powders comprise ZSM-5 type zeolites, Linde Type A (LTA) zeolites or a mixture thereof; said zeolite powders characterized by a) a Si/Al ratio comprised between 1.0 and 25, b) a pore size comprised between 3.0 and 14 Å and a specific accessible area lower than 1700 m 2 /cm 3 , c) a Loose Bulk Density (LBD) value comprised between 100 and 700 kg/m 3 , d) a Fe (II)/(III) amount lower than 0.5% by weight, and e) sodium, potassium, calcium, or hydrogen as counter-ion at an ion exchange site of a framework structure.
2. 2 . The method of claim 1 , wherein the zeolites have a surface functionalization realized through hydrolysis-condensation reaction with a silane suitable for the use in a cosmetic composition.
3. 3 . The method of claim 2 , wherein the silane quantity is in amount comprised between 0.4 and 15% by weight with respect to the total zeolites weight.
4. 4 . The method of claim 1 , wherein said zeolites are characterized by an oil absorption value comprised between 10 and 160 ml/100 g of powder measured by the analytical ASTM D281.
5. 5 . The method of claim 1 , wherein said zeolites are characterized by a X 90 value comprised between 0.1 and 30 μm, measured according to the method ISO 13320:2020.
6. 6 . The method of claim 1 , wherein said zeolites are characterized by a surface area comprised between 200 and 900 m 2 /g.
7. 7 . The method of claim 1 , wherein the zeolites are combined in an amount comprised between 1 and 75%, with respect to the total weight of the cosmetic composition.
8. 8 . The method of claim 1 , wherein said cosmetic composition is a skincare composition.
9. 9 . The method of claim 1 , wherein said cosmetic composition is a makeup composition.

Description

FIELD OF THE INVENTION The present invention relates to the field of cosmetic formulation and, in particular, to the use of a zeolite powder for the preparation of a cosmetic composition. BACKGROUND OF THE INVENTION In the field of cosmetic formulation, one of the main demand is related to the development of active formulations that, at the same time, can ensure a good spreadability and conformability to the skin. In order to reach the expected feeling in use related to the texture of the formulation, several approaches have been followed according to the different matrixes, formulations and final applications. For example, in the field of non-aqueous compositions, JP87158/1998 and 194327/1998 report the possibility to incorporate a thickening polymer, soluble in a polyhydric alcohol, or silica gel in order to facilitate the application of the polyhydric alcohol to the skin. However, considering the disclosures reported above, the use of a single thickening polymer brings to the necessity of using a great amount of such compound in order to reach the desired texture of the formulation; therefore, one of the main solutions to that is, as reported in European patent application EP0974340, the possibility to use a finely particulate of inorganic compounds. In the field of filler compositions to be added to a cosmetic composition in order to modify specific properties such as viscosity, it is known in the art, as for example reported in International patent application WO2022146700, the possibility to employ several classes of compounds such as inorganic powders, typically titanium dioxide, calcium carbonate, zinc oxide, silica compounds, clay, mica and zeolites, or organic powders and beads such as polyethylene, polymethyl methacrylate, polyamide/Nylon-12, polyethylene terephthalate, polyurethane, polysiloxanes, commonly defined as microplastics and nanoplastics. Zeolites can be used for different purposes exploiting for example their carrier properties, as disclosed in patent applications US20200179243 or EP1971309, their capacity to generate heat when specific formulations are in contact with water as reported in European patent application EP1186286, or to modify the viscosity of a cosmetic preparation in order to improve the feelings of smoothness and spreadibility (see for example Japanese patent application JP1985218305). However, as also reported in the cited prior art, for cosmetics formulations which comprise zeolites, silica or different texturizing fillers, usually the use of broad particles size distribution, including nanometrics particles, is reported for an easier dispersability. In recent years, the pollution of the ocean environment and the marine-ecosystem by microplastics and nanoplatiscs has become a big concern. In 2019 the European Commission (EC) published the “European Green Deal” which comprises a set of policy initiatives with the aim of making the European Union climate neutral in 2050 and, related to that, the EC requested to the European Chemicals Agency (ECHA) to formulate a proposal for a restriction on “intentionally added microplastics” in products such as cosmetics, detergents, and agricultural products. In addition to that, the adoption of some classes of compounds such as silica and talc has been progressively reduced due to their toxicity for human and environment. Therefore, according to the European Commission definition of a nano material as a material where the 50% of the particles, in the number-weighted particle size distribution, have their smallest dimension below 100 nm, cosmetic products including a reduced or null amount of plastic nano-fillers are in increasing demand. SUMMARY The aim of the present invention is therefore to provide cosmetic formulations free of any plastic nano-filler but having the same or better spreadability and conformability to the skin with respect to the cosmetic formulations known in the art. After extensive experimentations, the inventors of the present invention found out that by using zeolite powders the texture of a cosmetic composition, can be improved while avoiding the use of nano fillers. Glossary All percentages, parts and ratios are based upon the total weight of the compositions of the present invention, unless otherwise specified. The term “weight percent” or “by weight” may be also denoted as “wt %” herein. Herein, “comprising” means that other ingredients can be added. This term encompasses the term “consisting of”. DETAILED DESCRIPTION OF THE INVENTION Specifically, it has been surprisingly found by the inventors that, by using synthetic lipophilic zeolites with well-defined technical features in a cosmetic formulation, it is possible to obtain a good spreadability and conformability on the skin, while avoiding unpleasant color and odor deriving from starting materials. Therefore, the present invention, refers to zeolite powders, more preferably synthetic lipophilic zeolite powders as better defined below, for cosmetic fo