DD254142A1 - SKIN CARE PRODUCTS - Google Patents

Abstract

Skin care products based on oil-in-water emulsions with good protection against skin surface lipids. The skin care products are said to enhance positive cosmetic properties and not to form long lasting visible fat films on the skin. This is achieved by the use of 2 to 8% by weight of a low molecular weight ethylene-vinyl acetate-vinyl alcohol terpolymer having a vinyl acetate content of 15 to 25% by weight and an acid number of 2 to 10 mg KOH / g.

Description

Object of the invention

The object of the invention is to develop storage-stable skincare compositions based on oil-in-water emulsions, which are distinguished by a good protective action against skin surface lipids, and in which positive properties of additives in the cosmetic field are enhanced and storage-stable visible fat films the skin can be avoided.

Explanation of the essence of the invention

It was therefore the object of equipping oil-in-water emulsions so that an affinity arises between the emulsion constituents and the skin lipids, which reduces washing out of the skin surface lipids after water treatment. This object is achieved by skin care compositions based on oil-in-water emulsions which, according to the invention, contain from 2 to 8% by weight of a low molecular weight ethylene-vinylacetate-vinyl alcohol terpolymer having a vinyl acetate content of 15 to 25% by mass. and an acid number of 2 to 10 mg KOH / g.

It is particularly advantageous that the storage stability of these emulsions can be improved over known ones. Another advantage is the improved protective effect on the Hautoberflächenlipidfilm no visibly long-lasting fat film on the skin.

embodiments

The emulsions according to Examples 1 to 3 were prepared as follows: The components of Phase I were used at temperatures of max. 90 ⁰ C melted. The components of phase II were brought to the same temperature and incorporated with the introduction of mechanical energy in the phase I. The resulting emulsions were mechanically processed to a temperature of 35 ⁰ C. At a temperature of 38 ⁰ C, phase IM was added.

example 1

Phase!

Paraffin perliquidum Il ABDDR 6.0%

Paraffinum Mollell ABDDR 1.5%.

Stearic acid IL AB DDR. 3.5%

Alcohol, emulsificantes 4,5%

Vaseline.flavum 3.0%

EVA terpolymer, 23.4% by weight Vac, SZ8 mg KOH / g 2.0%

Phasell

Water 56.25%

Triethanolamine '. 0.25%

1,2-propylene glycol IBDDR. 18.5%

Glycerol II AB DDR. 4.0%

Preservative '0.2%

Phase IM

Perfume oil 0.3%

Example 2

Phase I

low-viscosity wax ABDDR. 6.0%

Silicone oilNM1-200IIABDDRAnlage7 1,5%

StearylicoholllABDDR. 6.0%

RinderfußölllABDDR 3.0%

Vaselin.flavum Il AB DDR 3.0%

Paraffinum perliquidum Il AB GDR 5.0%

EVA terpolymer, 18.3 mass% Vac, 5 weight percent KOH / g 6.0%

RofacerllABDDR '1.0%

Phasell

Water 63.5%

Sodium glycol ether sulfates of chain length C 10 to C 16 80%, greater C 16 20%, 30%

aq. Solution, mean EO number: 3 2.0%

Propylenglyko! , 2.0%

Preservative 0.6%

Phase III

Perfume oil, 0.4%

Example 3

Phase I

Paraffinum perliquidum II AB GDR 7.0%

Monoglyceride not self-emulsifying 4.0%

low viscosity waxDABDDR 7.0%

Rofacer STIIABDDRAn! Age7 4.0%

Rapeseed oil hydr. 6.0%

Sesame oil 6.0%

Tocopherol acetate 0.01%

EVA terpolymer, Vac 20.3% by mass, SZ 9 mg KOH / g ^! 2.0%

Phasell

Water 56.69%

The sodium salt of Su ifbo- succinic acid esters of the chains length C 12 to C 14, medium EO

Number 3 "1.5%

Sorbitol 5.0%

Preservative 0.6%

Phase III

Perfume oil 0.2%

Claims (2)

Skin oil based oil-in-water emulsions containing from 2 to 8% by weight of a low molecular weight ethylene-vinyl acetate-vinyl alcohol terpolymer having a vinyl acetate content of 15 to 25% by weight and an acid number of 2 to 10 mg KOH / g. Field of application of the invention The invention relates to skin care products of the oil-in-water type, which find use in cosmetics. Characteristic of the known state of the art The largest product groups of skin care products in cosmetics are oil-in-water emulsions. The emulsions consist of a lipid phase containing animal, vegetable and / or synthetic fats, waxes, fatty alcohols, fatty acids, fatty acid esters and the like. a., And from a water phase with water-soluble constituents. Through the use of an emulsifier, the distribution of the disperse phase in the dispersion medium is maintained (G. A. Nowak: The Cosmetic Preparations, 3rd Edition, Bd. 2, publishing house for chemical industry H.Ziolkowsky KG, Augsburg). Oil-in-water emulsions are oil droplets surrounded by a water phase. Their characteristic utility value properties are characterized by the outer phase, ie the water phase. Therefore, oil-in-water emulsions are less greasy, more dull, quickly absorbed into the skin, and smooth and nourish the skin without leaving a long-lasting visible and tactile shiny greasy film typical of water-in-oil emulsions. For this reason, oil-in-water emulsions are very versatile not only as day creams, powder bases, non-greasy hand creams, but also as active ingredient preparations and body lotions. The stability of these systems at low and high storage temperatures is responsible for the high malt fraction of the oil-in-water emulsions. A disadvantage of the known oil-in-water emulsions, however, is the low protective effect on the skin's own surface lipids after water treatment. It is also known to use high molecular weight ethylene-vinyl acetate copolymers in amounts of from 10 to 30% by weight in oil-in-water emulsions (DE-OS 2,423,849). Furthermore, it is known a combination of 20 to 50Ma .-% of a highly refined vaseline with a dropping point between 38 and 5O ⁰ C, 30 to 70 Ma .-% of a Montanwachsraffinats with at least 60 wt .-% Hartwachsanteilen and an acid number ^ 20 mg KOH / g and 5 to 25% by mass of a copolymer of ethylene with 20 to 40Ma ₁ -Vo to produce a functional group-containing olefinic comonomer (DD-PS 217530A1). The disadvantage here is that it comes when used in oil-in-water emulsions due to the relatively high molecular weights (melting points> 100 ⁰ C) to instabilities of the emulsions. The result is oil and water deposits. Another disadvantage is that due to the high melting points of the polymers, a high energy consumption for the preparation of the emulsions is necessary and thus temperature-sensitive substances in skin care products can not be used.