Preservative systems and compositions comprising the same
The invention is directed to a natural preservative system that comprises a substituted amino acid and with benzoic acid and/or a derivative thereof. The preservative system provides superior antimicrobial benefits and color stability to end use compositions even when the compositions are formulated to have a pH in the range of 3.5 to 8.2.
1 . A wash composition comprising a preservative system, an acyl isethionate, a zwitterionic surfactant comprising a betaine, a sultaine or both and the composition has a pH from 6 to 7.8, wherein the preservative system comprises:
(a) a first component comprising a substituted amino acid; and
(b) a second component comprising benzoic acid and/or a derivative thereof,
wherein the first component and second component are present at a weight ratio from 1:4 to 4:1, and further wherein the composition optionally comprises sodium dehydroacetate, and when present, the sodium dehydroacetate and the second component are present at amounts where the sodium dehydroacetate makes up less than 5% by weight based on total weight of sodium dehydroacetate and second component in the preservative system, the composition comprising from 30 to 82% by weight water and wherein no preservative is present in the composition in addition to the first component and second component, and further wherein the first component is decanoyl glycine, N-capryloyl glycine, N-undecylenoyl glycine, N-undecylenoyl phenylalanine or a mixture thereof; and the second component is sodium benzoate, potassium benzoate, amino benzoate or a mixture thereof, and the zwitterionic surfactant is a betain comprising cocamidopropyl betaine, and the acyl isethionate, is sodium lauroyl isethionate, sodium cocyl isethionate or a mixture thereof, and the composition comprises an additional surfactact comprising sodium lauroyl glycinate, sodium cocoyl glycinate, sodium methyl lauroyl taurate, sodium methyl cocoyl taurate or a mixture thereof.
2 . The composition according to claim 1 , wherein the composition comprises less than 0.125% by weight sodium dehydroacetate and the composition comprises from 40 to 80% by weight water.
3 . The composition according to claim 2 , wherein the composition has a pH from 6 to 7.5 and comprises sodium lauroyl isethionate and the additional surfactant is sodium lauroyl glycinate.
4 . The composition according to claim 2 , wherein the first component is N-capryloyl glycine or undecylenoyl glycine or a mixture thereof, the second component is sodium benzoate, and the composition comprises additional surfactant which is sodium methyl lauroyl taurate, cocamidopropyl betaine and sodium lauroyl isethionate.
5 . The composition according to claim 1 , wherein the composition is a baby wash.
6 . The composition according to claim 2 , wherein the first and second components are present in the composition at a total weight of 0.2 to 4% by weight of the composition, the pH of the composition is from 6 to 7.1 and the additional surfactant is sodium lauroyl glycinate.
7 . The composition according to claim 1 , wherein the composition further comprises cannabigerol and/or cannabidiol.
8 . The composition according to claim 1 , wherein the composition has from 40 to 82% by weight water, and a pH from 6.2 to 7.5.
9 . The composition according to claim 1 , wherein the first component comprises undecylenoyl phenylalanine and capryloyl glycine in a weight ratio from 2:1 to 1:2.
10 . The composition according to claim 1 , wherein the first component comprises undecylenoyl phenylalanine and the composition has a pH from 6.4 to 7.1 and water makes up from 40 to 82% by weight of the composition.
11 . A method for treating skin by contacting the skin with the composition according to claim 1 .
12 . The composition according to claim 1 wherein the composition further comprises stearic acid, 12-hydroxystearic acid, palmitic acid, terpineol, thymol, lauric acid, retinoic acid precursor or a mixture thereof.
13 . The composition according to claim 1 wherein the composition further comprises 4-ethyl resorcinol, 4-hexyl resorcinol, sunscreen, vitamin C, rosemary extract, sage, chamomile, sunscreen or a mixture thereof.
14 . The composition according to claim 1 wherein sodium dehydroacetate makes up from 0.0 to less than 0.0125% by weight of the wash composition.
15 . The composition according to claim 1 wherein the wash composition does not include a surfactant system with sulfates.