Water-in-oil emulsion comprising pigments in the water phase

Abstract

Provided is a composition and especially a cosmetic composition comprising: A) an oily phase and B) an aqueous phase which comprises: a) water, b) a pigment, c) a modified phospholipid, and d) an alkyl substituted diol comprising 5 or more carbons; wherein the composition is in the form of an water-in-oil emulsion, and wherein the pigment essentially remains in the water phase. Also provide is a method of producing the composition which comprises: 1) obtaining a mixture of a modified phospholipid and an alkyl substituted diol comprising 5 or more carbons in the alkyl chain; 2) obtaining a mixture of water and a pigment; 3) combining the mixture of the modified phospholipids and the alkyl substituted diol with the mixture of the pigment and water; 4) obtaining an oil composition; and 5) combining the mixture from 3) with the oil composition of 4) to form an water-in-oil emulsion.

Description

TECHNICAL FIELD[0001]The present disclosure is concerned with water-in-oil emulsions that comprise pigments, wherein the pigments are in the water or inner phase of the emulsion, and a process for fabricating the emulsions. It has been found according to the present invention that a combination of a modified phospholipid along with an alkyl substituted diol having an alkyl chain of at least 5 carbon atoms makes it possible to essentially maintain pigments including untreated pigments in the water phase. The present disclosure is especially concerned with personal care products. The disclosure further relates to the use of the composition, in particular for treating, caring for, making up and / or cleaning the skin, superficial body growths (hair, eyelashes, nails) and / or mucous membranes. Also, compositions of the present disclosure are suitable for topical application, and in particular is a cosmetic and / or dermatological composition.[0002]Additional advantages and other features of ...

AI Technical Summary

Benefits of technology

[0017]The present disclosure is concerned with water-in-oil emulsions comprising at least one pigment in the water phase. According to the present disclose, the pigment is dispersed in and is stabilized in the water phase. In addition, the present disclosure makes it possible to address the problem whereby the shade of the composition dramatically changes due to the pigment not wetting properly. Accordingly, the present disclosure makes it possible to achieve a substantially consistent shade as the composition transitions from the wet to dry state. Furthermore, the present disclosure makes it possible to achieve enhanced color intensity.

[0019]It has been found according to the present disclosure that the combination of the modified phospholipid and alkyl substituted diol comprising 5 or more carbons in the alkyl chain allows for relatively uniform pigment dispersion in the aqueous phase. The combination of at least one modified phospholipid and at least one alkyl substituted diol comprising 5 or more carbons in the alkyl chain provides adequate hydrophobicity and hydrophilicity that prevents the pigments from agglomeration in the water phase of the water-in-oil emulsion. It is believed that the hydrophobic part of the modified phospholipid will attach to the pigment. Similarly, the alkyl chain of the diol will also attach to the pigment. At the same time, the hydrophilic part of the modified phospholipid and hydroxyl groups of the alkyl substituted diol comprising 5 or more carbons in the alkyl chain will extend to the water phase of the water-in-oil emulsion.

Problems solved by technology

When used as part of facial powders, pigments provide coverage of complexion that is considered by the user as undesirable.

Accordingly, a challenge facing the personal care industry is to provide an efficient formulation that would maintain pigments and especially untreated pigments in the water phase of a water-in-oil emulsion.