Cleansing compositions
Inventors
Blachechen, Tatiana • Guedes Jorge, Maria Cristina • Morais, Jacqueline • Bishop, Christina • Dexter, Marni
Assignees
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Publication Number
US-12083208-B2
Publication Date
2024-09-10
Expiration Date
Abstract
Sulfate-free cleansing compositions that include a surfactant and a conditioning agent are disclosed. The cleansing compositions are suitably thick and have a desired level of clarity. The cleansing compositions, which are slightly acidic, are mild to the skin and/or eyes.
Core Innovation
The patent describes a sulfate-free cleansing composition formulated to provide skin mildness, clarity, and a specified pH and viscosity profile. The composition includes a surfactant system combining first and second non-ionic surfactants, an amphoteric betaine surfactant, and first and second anionic surfactants, together with a polyquaternium conditioning agent, a preservative system, and a thickener.
A key aspect of the formulation is the use of PEG-80 sorbitan laurate and decyl glucoside as the non-ionic surfactants, together with betaine as the amphoteric surfactant. For the anionic surfactants, the formulation uses sodium methyl cocoyl taurate and an isethionate in a defined weight ratio, while maintaining the overall composition free of sulfate surfactants and targeting specified skin mildness and physical property thresholds.
The patent further associates the surfactant-thickener/conditioning system with performance outcomes that balance clarity versus viscosity and mildness. The document reports in vitro mildness testing and optical/physical evaluation approaches to characterize skin mildness and clarity/viscosity of the sulfate-free cleanser, and provides comparative and inventive examples demonstrating formulations with good foaming while avoiding sulfate.
Claims Coverage
The independent claim defines a sulfate-free cleansing composition with a specific multi-surfactant system, plus a polyquaternium conditioning agent, preservative system, and thickener, while meeting defined property constraints. Dependent claims further refine measurable optical clarity, select preservative options, specify thickener selections, add pH adjuster constraints, and narrow numeric ranges for at least two surfactant components.
Sulfate-free multi-surfactant cleansing composition with defined non-ionic, amphoteric, and dual anionic surfactants
A cleansing composition comprising a surfactant system including PEG-80 sorbitan laurate as a first non-ionic surfactant, decyl glucoside as a second non-ionic surfactant, an amphoteric surfactant comprising betaine, and a first anionic surfactant sodium methyl cocoyl taurate together with a second anionic surfactant isethionate, with the first and second anionic surfactants present at a weight ratio of about 1:1, and wherein the cleansing composition is free of a sulfate surfactant.
Polyquaternium conditioning agent with preservative system and thickener
The cleansing composition further includes a conditioning agent comprising a polyquaternium component, a preservative system present in the composition, and a thickener present in the composition.
Specified skin mildness, pH, and viscosity constraints for the sulfate-free cleanser
The cleansing composition has a skin mildness score of IL-1α release less than about 150 pg/ml, a pH of from about 3.5 to about 5.5, and a viscosity of about 1,000–9,000 cps at 25°C.
Optical clarity requirement by UV spectroscopy transmittance
A cleansing composition characterized by a UV-spectroscopy transmittance greater than 40.000% measured at 800 nm.
Preservative system selected from sodium benzoate and benzoic acid
The cleansing composition where the preservative system includes sodium benzoate or benzoic acid.
Thickener selected from PEG ester materials
The cleansing composition including a thickener selected from PEG-150 distearate, PEG-200 hydrogenated glyceryl palmitate, or PEG-7 glyceryl cocoate.
pH adjuster comprising an acid
The cleansing composition includes a pH adjuster comprising an acid.
Narrowed surfactant amounts for PEG-80 sorbitan laurate and decyl glucoside
A cleansing composition in which PEG-80 sorbitan laurate is present at about 0.7% by weight and decyl glucoside is present at about 2.9% by weight.
Overall, claim coverage centers on a sulfate-free cleansing composition built from a specified PEG-80 sorbitan laurate/decyl glucoside non-ionic pair, betaine amphoteric surfactant, and sodium methyl cocoyl taurate plus isethionate anionic surfactants at about a 1:1 weight ratio, together with polyquaternium conditioning, a preservative system, and a defined thickener, while meeting IL-1α release, pH, and viscosity constraints. Dependent claims further narrow optical clarity via UV transmittance, specify preservative and thickener selections, require an acid-containing pH adjuster, and narrow numerical surfactant amounts.
Stated Advantages
Skin mildness characterized by IL-1α release less than about 150 pg/ml.
Specified pH range of about 3.5 to about 5.5.
Specified viscosity range of about 1,000–9,000 cps at 25°C.
Improved optical clarity characterized by UV transmittance greater than 40.000% at 800 nm.
Good foaming without sulfate.
Documented Applications
Sulfate-free cleansing formulations intended to provide skin mildness, clarity, and performance within specified pH and viscosity ranges.
In vitro evaluation of skin mildness and irritation potential using EpiDerm and EpiOcular-related approaches and IL-1α release.
Characterization of clarity and viscosity/physical properties using UV transmittance and optical/physical measurement approaches.
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