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US 12,478,566 B2Granted
Color stable skin benefit compositions
AssigneeConopco, Inc.
InventorsAnjing Lou, Congling Quan, William Zavoluk, Teanoosh Moaddel
Life of this patent
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Abstract
Nanoemulsions as emulsion additives are prepared to stabilize actives and prevent formulation discoloration. The nanoemulsions have at least 30% by weight oil and are suitable to add to emulsions and/or structured water to produce color stable end use skin benefit compositions.
Claims15
A method for improving color stability of an end use composition by reducing discoloration originating from active comprising 4-ethyl resorcinol, 4-hexyl resorcinol or both, and retinyl propionate, retinol or both present in the end use composition, the method comprising the steps of:
- a) preparing a water continuous nanoemulsion by mixing with homogenization at a pressure from 1,500 to 6,000 psi (a) the active;
- (b) water;
- (c) water soluble humectant (d) oil;
- and (e) emulsifier, wherein:
- i) the active is soluble in the oil;
- ii) oil as particle in the nanoemulsion has a particle size from 0.05 to less than 1.5 microns;
- and
- iii) the nanoemulsion comprises at least 30% by weight oil;
- b) combining the nanoemulsion with an emulsion chassis, the emulsion chassis being water continuous;
- and
- c) shearing the nanoemulsion and emulsion chassis after combining to produce the end use composition;
- and
- d) recovering the end use composition, wherein the nanoemulsion makes up from 25 to 60% by weight of the end use composition and the end use composition is water continuous.
10 more elements
Dependencies are inferred from the claim text.