Emulsifier-free, finely disperse cosmetic or dermatological form

Details Emulsifier-free, finely disperse cosmetic or dermatological form Emulsifier-free, finely disperse cosmetic or dermatological form

1997-05-19

1998-11-10

Owens, Amelia

Drug, bio-affecting and body treating compositions

Effervescent or pressurized fluid containing

Organic pressurized fluid

A61K 700

Patent

active

058339515

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to cosmetic and dermatological formulations of the oil-in-water type, processes for their preparation and their use for cosmetic and medical purposes.
Cosmetic skin care is primarily to be understood as meaning that the natural function of the skin as a barrier against environmental influences (for example dirt, chemicals, microorganisms) and against the loss of endogenous substances (for example water, natural fats, electrolytes) is intensified or re-established.
If this function is impaired, an increased absorption of toxic or allergenic substances or attack by microorganisms and, as a consequence, toxic or allergic skin reactions may occur.
The aim of skin care is furthermore to compensate the loss of fats and water from the skin caused by daily washing. This is important precisely if the natural capacity for regeneration is inadequate. Skin care products should furthermore protect against environmental influences, in particular against sun and wind, and delay ageing of the skin.
As a rule, medical topical compositions comprise one or more medicaments in an active concentration. For simplicity, to make a clear distinction between cosmetic and medicinal use and corresponding products, reference is made to the legal provisions of the Federal Republic of Germany (for example cosmetics legislation and foodstuffs and medical preparations law).
In simple emulsions, one phase contains finely disperse droplets of the second phase enclosed by an emulsifier shell (water droplets in W/O emulsions or lipid vesicles in O/W emulsions).
The use of customary cosmetic emulsifiers is acceptable in itself. Nevertheless, emulsifiers, like any chemical substance in the end, can cause allergic reactions or reactions based on hypersensitivity of the user in an individual case.
It is thus known that certain photodermatoses can be triggered by certain emulsifiers, and also by various fats, and at the same time exposure to sunlight. Such photodermatoses are also called "Mallorca acne". One object of the present invention was therefore to develop emulsifier-free sunscreen products.
Emulsifier-free light protection preparations based on so-called hydrodispersions have been accessible to the consumer for some time.
Hydrodispersions are dispersions of a liquid, semi-solid or solid internal (discontinuous) lipid phase in an external aqueous (continuous) phase.
In contrast to O/W emulsions, which are distinguished by a similar phase arrangement, hydrodispersions are essentially free from emulsifiers. Hydrodispersions, like other emulsions otherwise, are metastable systems and tend to convert into a state of two discrete phases which are coherent in themselves. In emulsions, the choice of a suitable emulsifier prevents phase separation.
In hydrodispersions of a liquid lipid phase in an external aqueous phase, the stability of such a system can be guaranteed, for example, by building up in the aqueous phase a gel matrix in which the lipid droplets are suspended in a stable form.
Formulations of the prior art, however, in general have the disadvantage that they are either unstable, have a narrow range of use or are limited to a limited choice of starting substances. It is usually furthermore the case that compositions of the prior art contain little or even no skin care fats or oils.
An object of the present invention was to provide emulsifier-free finely disperse formulations of the oil-in-water type which do not have the disadvantages of the prior art. Another object of the invention was to enrich the limited range of emulsifier-free finely disperse formulations of the oil-in-water type of the prior art. It was furthermore an object of the present invention to provide stable, emulsifier-free formulations with a high fat and/or oil content.


SUMMARY OF THE INVENTION

Astonishingly, these objects are achieved by finely disperse, emulsifier-free cosmetic or dermatological formulations of the oil-in-water type comprising oils, fats and/or waxes, polymers, polysaccharides and alkyl

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