Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic... – Skin cosmetic coating
Patent
1997-06-02
1998-12-29
Venkat, Jyothsna
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
Skin cosmetic coating
424 59, 424 63, 424401, A61K 7021
Patent
active
058537120
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to cosmetic make-up compositions and more particularly, to pigmented foundation make-up compositions having improved coverage together with excellent moisturisation effectiveness, application characteristics, skin feel and appearance. The present invention also relates to processes for manufacturing cosmetic make-up compositions which provide a convenient means for shade adjustment of the said compositions.
BACKGROUND OF THE INVENTION
A foundation composition can be applied to the face and other parts of the body to even skin tone and texture and to hide pores, imperfections, fine lines and the like. Particularly suitable foundation compositions are available in the form of liquid or cream suspensions, emulsions, and gels.
Such compositions are typically made by incorporating a mixture of pigments into a liquid base. The pigments, commonly based on iron oxides, titanium dioxide, or mixtures thereof, are chosen such that they provide desirable skin tones when the product is applied to the skin. The process for incorporating the pigments often requires a milling stage in order to control the pigment dispersion and thus provide smooth and even coverage of the skin.
As a consequence of variances in raw materials and processsing, batches of finished product may deviate in colour from the target shade. Routine manufacture usually allows for a final shade adjustment of each liquid foundation batch. Since the pigments used cannot usually straightforwardly be added to the finished product without first pre-wetting them in either the oil or water phase, a common practice is to prepare monochromatic batches of finished product specifically for the purpose of final shade adjustment. The need to prepare these monochromatic batches increases the complexity and cost of the manufacturing process.
Quite apart from manufacturing considerations, users of foundation compositions often express dissatisfaction with the degree of coverage of the skin provided by foundations based on conventional pigment systems. Moreover, it is often found that in attempting to improve the amount of coverage by increasing the total pigment level, the naturalness of appearance is adversely affected. It would therefore be desirable to provide a foundation composition containing novel pigment systems which deliver improved coverage and wear without compromising on other properties of the foundation such as skin feel, application characteristics and a natural appearance.
It is accordingly an object of this invention to provide a foundation composition in the form of either a water-in-oil or an oil-in-water emulsion, which exhibits improvements in coverage, together with excellent wear characteristics and a natural appearance.
It is also an object of this invention to provide a foundation composition which provides improvements in coverage and wear without trade-offs in other areas of foundation performance, especially skin feel and application characteristics.
It is a further object of the invention to provide an improved method of manufacturing and shade-matching of colour cosmetic emulsion-form compositions, and, in particular, a method in which the shade can be adjusted to the desired target without the need to use separately prepared monochromatic batches of the compositions.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a process for manufacturing a colour cosmetic water-in-oil or oil-in-water emulsion composition in which the colour derives from the addition of inorganic or organic pigment, wherein at least a portion of the pigment is made water-dispersible by surface treatment with hydrophilic polymer, and wherein the process comprises adding all or part of the water-dispersible polymer-treated pigment into a pre-formed water-in-oil or oil-in-water emulsion.
According to a further aspect of the invention there is provided a colour cosmetic water-in-oil or oil-in-water emulsion composition wherein the aqueous phase contains a water-dispersible
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Allen George W.
Suter David L.
The Procter & Gamble & Company
Venkat Jyothsna
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