Antimicrobial liquid composition and use thereof as a preservative activator in cosmetic products
The present application relates to the use of an antimicrobial composition comprising essentially ingredients of natural origin as a preservative activator in cosmetic products. Due to the selection of the components of this antimicrobial composition, it has very broad compatibility with most formulations of cosmetic products, and may in particular be integrated into these formulations without destabilizing them or having to modify them, while maintaining the transparency of said cosmetic products.
1 . A method for activating cosmetic product preservatives, comprising the step of incorporating an antimicrobial liquid composition into a cosmetic product containing preservatives, wherein the antimicrobial liquid composition comprises:
Cymbopogon essential oil in a mass percentage ranging from 0.1% to 10% by dry weight,
caprylyl/capryl glucoside in a mass percentage ranging from 1% to 40% by dry weight,
gluconic acid in a mass percentage of from 10% to 70% by dry weight, and
sodium gluconate in a mass percentage ranging from 1% to 50% by dry weight, the percentages by weight being expressed in relation to the total weight of the liquid antimicrobial composition;
wherein the preservatives are chosen from benzyl alcohol, potassium sorbate, phenoxyethanol, and sodium benzoate or a mixture thereof.
2 . The method according to claim 1 , wherein the essential oil is selected from Cymbopogon flexuosus Stapf. and Cymbopogon citrulatus (DC.) Stapf.
3 . The method according to claim 1 , wherein the ratio of the total dry mass of caprylyl/capryl glucoside to the total dry mass of essential oils is greater than or equal to 2.
4 . A cosmetic product comprising:
at least one preservative selected from sodium benzoate, potassium sorbate, phenoxyethanol, benzyl alcohol or a mixture thereof, wherein the preservative is present up to 2.5% by gross weight relative to the total weight of the cosmetic product,
and at least 1% by gross weight of an antimicrobial liquid composition relative to the total weight of the cosmetic product, wherein the antimicrobial liquid composition comprises:
essential oil of one of the species of the genus Cymbopogon is present in a mass percentage ranging from 0.1% to 10% by dry weight,
caprylyl/capryl glucoside is present in a mass percentage ranging from 1% to 40% by dry weight,
gluconic acid is present in a mass percentage of from 10% to 70% by dry weight,
sodium gluconate is present in a mass percentage ranging from 1% to 50% by dry weight,
water has a mass percentage ranging from 20% to 75% by weight, the percentages by weight being expressed in relation to the total weight of the liquid antimicrobial composition.
5 . The cosmetic product according to claim 4 , wherein it is in the form of an oil-in-water emulsion, or a water-in-oil emulsion, or an aqueous suspension, or an aqueous foam, or a true aqueous solution, or a micellar solution, or a hydroalcoholic solution, or a paste, or a gel, or a powder, or a tablet, or a wipe.
6 . The method according to claim 1 , characterized in that said gluconic acid is divided into at most 35% by dry weight of the sodium gluconate of said gluconic acid and at least 65% by dry weight of said gluconic acid.
7 . The method according to claim 1 , further comprises water at a mass percentage ranging from 20% to 75% by weight, the percentage by weight being expressed in relation to the total weight of the liquid antimicrobial composition.