Cosmetic sticks

Details Cosmetic sticks Cosmetic sticks

1994-02-14

1996-07-23

Venkat, Jyothsna

Drug, bio-affecting and body treating compositions

Live skin colorant containing

Lip

424401, 424DIG5, A61K 7027

Patent

active

055387187

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/DE92/00649 filed Aug. 5, 1992.
The present invention relates to cosmetic sticks, in particular lipsticks, preferably lip-care sticks, and to compositions and processes for the production of cosmetic sticks.
The skin of the lips has only an extremely thin horny layer. There are no sweat glands at all on the lips, and only isolated sebaceous glands. The skin of the lips is therefore practically free from oil, and tends to dry out, especially during cold and dry weather. Small cracks can then form in the skin, and the sensitivity of the lips to chemical, physical and microbial actions (for example foodstuffs, sunlight and herpes simplex viruses) increases.
The task of lip-care sticks is to prevent this. These products usually comprise a high content of waxes and fat components which form a covering layer over the lips after application.
Active compounds which promote lip care or lip protection, for example vitamins, moisturising agents, agents giving protection against light, opaque pigments and the like, can additionally be incorporated into the formulations for lip-care sticks.
The corium of the lips contains well-circulated papillae, which extend to just below the surface of the lips. The lips are therefore reddish in colour, and are contrasted in colour to a greater or lesser degree from the remaining skin of the face, depending on the complexion of the person in question. A stylistic means of decorative cosmetics is hence also to match the colour of the lips to the type of person by appropriate cosmetics.
Products of this type are decorative lipsticks, into which the most diverse coloured pigments can be incorporated. These sticks also comprise high contents of waxes and fat components which form a covering lipid layer over the lips after application.
However, the object of this layer at present is not to protect the skin of the lips from drying out. The lipid layer serves here as a base for the incorporated pigments which adheres to the lips; for various reasons, the pigments themselves cannot be applied to the lips without such a base.
It is also possible to combine the properties of the lip-care sticks and decorative lipsticks with one another, i.e. to incorporate lip-care or protective substances into decorative lipsticks.
Technically, almost all lipsticks are anhydrous fatty mixtures of solid or semi-solid waxes and liquid oils, the lipstick base being highly purified paraffin oils and waxes.
According to the ideal profile of requirements, it should be possible to apply lipstick smoothly and without a high frictional resistance. Moreover, even under gentle pressure, a lipstick should give to the lips a fatty film which is not oily, dull or tacky but nevertheless is firmly adhering. This fatty film should then make the lips smooth and supple.
Furthermore, a lipstick must also meet the requirements that it must be break-proof and heat-resistant, and should not lose its oil.
Customary bases of the prior art are myristate), lanolin), waxes or ozokerite) and
Lipsticks of the prior art having a content of paraffins and beeswax are described in "Kosmetik, Entwicklung Herstellung und Anwendung kosmetischer Mittel [Cosmetics, development, preparation and use of cosmetic agents]", page 105, editor: W. Umbach, Georg Thieme Verlag, Stuttgart--New York, 1988.
However, the prior art has a number of disadvantages. These include the fact that water-soluble active compounds are often not sufficiently soluble in fats for them to be incorporated into the cosmetic bases to any appreciable extent. On the other hand, a certain content of water would be entirely desirable, in order to increase the compatibility of the cosmetic stick with the human skin.
A process for the preparation of a cosmetic stick based on a water-in-oil emulsion is known from DBP 2,335,549. According to this teaching, a gel is prepared from a polyhydroxy compound and a nonionic surface-active compound, this gel is mixed with a cosmetic base and a content of water is then emulsified into the mixture.
However, sticks w

REFERENCES:
patent: 5047232 (1991-09-01), Kaplan
patent: 5225186 (1993-07-01), Castogiovanni et al.

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