Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1996-09-12
1998-11-03
Lovering, Richard D.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
252312, 424 7019, 424 7031, 510119, 510417, 510471, 514941, 514975, A61K 7075, A61K 708, A61K 748, B01J 1300
Patent
active
058304835
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP95/00533 filed Feb. 14, 1995.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to oil-in-water emulsions containing special emulsifier combinations.
2. Statement of Related Art
Many compositions are now being formulated as oil-in-water emulsions. Accordingly, they generally consist of water, oil component(s), emulsifier(s) and a number of components required for the particular application envisaged. In addition, it is standard practice to adjust the physical properties and appearance of the emulsions as required by incorporating corresponding auxiliaries, for example thickeners.
For various reasons, it is nowadays an objective to simplify the formulations of such oil-in-water emulsions, i.e. to formulate the desired products with a smaller number of components. On the one hand, this has economic advantages and, on the other hand, can reduce the risk in other fields of application, for example cosmetics and pharmaceutical products, of sensitive people and people with allergies experiencing problems with individual components of the preparation.
DESCRIPTION OF THE INVENTION
It has now been found that oil-in-water emulsions with outstanding properties can be obtained by using special emulsifier combinations. It is surprising that, in many cases, these emulsions can be formulated without certain components, for example special thickeners, despite their high water content. In addition, the emulsifiers need only be used in small quantities in many cases, i.e. in quantities below 1% by weight, based on the emulsion.
Accordingly, the present invention relates to an oil-in-water emulsion containing 50 to 99% by weight of water and 1 to 30% by weight of oil phase, characterized in that it contains an emulsifier system (E) which consists of
(A) a nonionic emulsifier corresponding to formula (I): number of 1 to 5, R.sup.1 is a saturated alkyl radical containing 1 to 3 carbon atoms, R.sup.2 is a linear or branched alkyl radical or mono- or polyunsaturated alkenyl radical containing 8 to 22 carbon atoms, y is the number 1 or 2, G is a polyglycerol residue consisting of 2 to 10 glycerol units and z is the number 1 or 2, and
(B) an ionic emulsifier selected from the group of cationic and anionic emulsifiers.
The nonionic emulsifiers (A) consist of structural elements obtained from natural renewable raw materials. They are therefore readily biodegradable and have advantageous ecological properties and thus meet the need to formulate products on the basis of renewable natural raw materials.
The core structural element of the emulsifiers (A) is a sugar unit selected from the hexoses and pentoses. Corresponding sugars are, for example, glucose, fructose, galactose, arabinose, ribose, xylose, lyxose, allose, altrose, mannose, gulose, idose, talose and sucrose. Preferred sugar units are glucose, fructose, galactose, arabinose and sucrose, glucose being particularly preferred. Although the hexoses and pentoses themselves are preferred structural units, it is also possible in accordance with the invention, if desired, to use emulsifiers (E) which contain corresponding oligosaccharides as their core structural unit. In such a case, the oligosaccharides are preferably composed of the same basic structural units. The oligosaccharides should be made up of at most 5 sugar units.
The sugar units are etherified with the alkyl radical of a short-chain alcohol and esterified with one or two long-chain, saturated or unsaturated fatty acids. The short-chain alkyl radical may be, in particular, the methyl radical or the ethyl radical. The methyl ethers are most particularly preferred. Suitable long-chain radicals R.sup.2 are linear or branched alkyl radicals or mon- or polyunsaturated alkenyl radicals containing 8 to 22 carbon atoms. Preferred radicals are those which may be obtained from renewable raw materials, such as fats or oils. Radicals with chain lengths of 10 to 18 carbon atoms are particularly preferred. Groups R.sup.2 --CO derived, for example, from lauric, myris
REFERENCES:
patent: 3625706 (1971-12-01), Myhre et al.
patent: 4330526 (1982-05-01), Watanabe et al.
patent: 4565647 (1986-01-01), Llenado
patent: 4865774 (1989-09-01), Fabry et al.
patent: 4931218 (1990-06-01), Schenker et al.
patent: 5133897 (1992-07-01), Balzer
patent: 5179201 (1993-01-01), Oftring et al.
patent: 5294726 (1994-03-01), Behler et al.
patent: 5358667 (1994-10-01), Bergmann
patent: 5603940 (1997-02-01), Candau et al.
Cosmetic News, vol. 16, Dec. 1993, pp. 408-414.
Hollenberg Detlef
Priebe Christian
Seidel Kurt
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lovering Richard D.
Millson Jr. Henry E.
Szoke Ernest G.
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