DE2725525A1 - COSMETIC PREPARATION - Google Patents

Description

May 11, 1977 1549-FTG-l

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SCHERICO LTD., Lucerne (Switzerland)

COSMETIC PREPARATION

The invention relates to stable, cosmetically elegant preparations for caring for the skin. The preparations are in Form of oil-in-water emulsions and contain glycerine, Isopropyl myristine, ethoxylated lanolin, glyceryl stearate, Lanolin, stearic acid and water. In a preferred embodiment, the preparations also contain urea.

Skin that is constantly exposed to dry climates or detergents tends to dry out slowly (loss of moisture from the surface and the stratum corneum). This results in rough, dry skin that flakes, peels, and cracks very easily. A continuous treatment of the skin with various preparations in order to avoid such disadvantages has often been attempted, but mostly the more or less effective agents have proven to be cosmetically inelegant. In this context, reference is made to US ^{Patents 3 T} 755,560 and 3,953,591.

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7098 F, 2/0782

May 11, 1977

1549-FTG-2

The present invention relates to a stable and cosmetically elegant preparation which supplies the skin with moisture without leaving an oily, greasy, grainy or sticky feeling after application. The skin stays soft and supple for a long time, and since the preparations prevent the peeling of the skin and the formation of flakes, are suitable they also help themselves to keep the suntan.

The preparations according to the invention are oil-in-water emulsions, the 5 to 10% glycerin; 2 to 5% glyceryl stearate; 1 to 3% lanolin; 2 to 6% stearic acid; 2 to 4% isopropyl myristine; 1 to 3% ethoxylated lanolin, in which the average ethoxylation is 2 0 to 8 5 moles of ethylene oxide; and contain water. The pH of the preparations should be around 5.5 to 7.5.

A preferred ethoxylated lanolin is PEG-7 5-lanolin, which has an average degree of ethoxylation of about 75 moles of ethylene oxide.

Various known additives can be added to the preparation according to the invention, such as perfume; Preservatives (e.g. parabens); Pigments; Antioxidants; Antiseptics; Chelating agents (e.g. the disodium salt of ethylenediaminetetraacetic acid); Emulsion stabilizers (e.g. hydroxyethyl cellulose); Antifoam agents (e.g. simethicones); Means of recruitment the viscosity; Sunscreens; Analgesics; Means 5 to keep away the insects, like other substances which come from any a reason should be desired. Sodium stearate can also be used as an anionic emulsifier in an amount from 0.1 to 0.5% can be added. As already mentioned, a preferred additional compound is urea.

709852/0782

May 11, 1977 1549-FTG-3

The good dermatological properties of urea have long been known. They were from Ratner: "Use of Urea in Hand Creams ", Archives of Dermatology and Syphilology; 48:47, 1943, and in U.S. Patent Nos. 2,322,565; 2,460,776; 2,987 · 446 and 3,666,863. Is urea Soluble in water and used in aqueous solutions as well as in oil-in-water emulsions, e.g. lotions and creams been.

The preparations with urea LO described in the literature have proven to be inadequate: urea has a tendency to crystallize, and this leads to granular ("sandy") preparations which irritate the skin and which are also cosmetically undesirable. In known oil-in-water emulsions, the urea tends to slowly decompose L5 (to NH ₃ and CO) and phase separations occur as a result. It has also been reported that known preparations containing urea (especially at higher concentrations) cause undesirable coloring of the skin, but above all of clothes.

In order to prevent the decomposition of the urea, attempts have been made to stabilize the mixtures with various additives. However, these additives mostly lead to the preparations got oily and sticky. In the U.S. Patent specification No. 3,666,863, for example, was the stabilization with the help of

J5 lactic acid carried out.

Because of the disadvantages mentioned above, preparations which contain more than 4% urea have so far only been found in patients who have had serious dermatological diseases, e.g. ichthyosis. With such patients you could

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May 11, 1977

1549-FTG-I +

various cosmetic defects out of consideration permit. The preparations according to the invention make it possible use the very good dermatological properties of urea in a cosmetically safe and elegant form, whereby such preparations can also be used by people with normal, relatively healthy skin. the Preparations can be used all year round and are particularly beneficial for moisturizing the skin after bathing to give and to make them soft and supple.

The preparations according to the invention are suitable as a base for compositions containing 0.1 to 10% urea. The preferred urea content is 4-6%.

The following examples illustrate the preparations according to the invention. All percentages in the examples as well otherwise in the application are percentages by weight, and the terminology used is in line with the "CTFA Cosmetic Dictionary ".

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7098S2 / 0782

May 11, 1977

1549-FTG-El

Example I. Part A weight (kg)

Glycerin 7.0

Disodium salt of ethylenediaminetetraacetic

acid 0.1

Methyl paraben 0.1

PEG-75 lanolin 1.0

Hydroxyethyl cellulose 0.2

Water 79.2

10 part B

Glyceryl stearate sodium stearate lanolin
Simethicone

15 propyl paraben stearic acid isopropyl myristine

100.0

The ingredients of part A (water phase) are heated to 80 C and stirred until a uniform mass is achieved. The ingredients of part B (oil phase) are also mixed, heated to 80 ⁰ C and stirred until the mixture is uniform. Part B is then slowly added to part A with stirring, the temperature continuing to be kept at 80 ^° C. The mixture is cooled to room temperature while stirring. The pH of the composition is 6.8.

709852/0782

May 11, 1977 1549-FTG-E2

Example II

Lotion with urea Weight (k ^) Part A 7.0 glycerin Disodium salt of ethylenediaminetetra- 0.1 acetic acid 0.1 Methyl paraben 1.0 PEG-75 lanolin 0.2 Hydroxy methyl cellulose 70.2 water part B 2.7 Glyceryl stearate 0.2 Sodium stearate 1.0 lanolin 03 Simethicone 0.1 Propyl paraben 4.0 Stearic acid 3.0 Isopropyl myrist in Part C. 5.0 urea 5.0 water

The ingredients of Part A (water phase) are mixed and stirred at 80 ° C until a uniform mixture is formed. Proceed in exactly the same way with the components of part B (oil phase). Then mixture B is slowly added to mixture A ^{at 80 ° C. with stirring.} The thus obtained

709852/0782

May 11, 1977

1549-FTG-E3

Mixture is cooled to 57 C and part C is slowly added with stirring. After that, the finished mixture cooled to room temperature with stirring. The pH of the composition is about 7.0.

In the above examples, a commercially available one is used Glyceryl stearate is used, namely the WITCONOL RHT (trade name of Wites Chemical Co.).

WITCONOL RHT has the following characteristics: acid number: 12 - 16; Saponification number: 152 - 162; iodine number of a maximum of 2.0; Melting point: 58 ° - 60 ⁰ C; pH of a 3% dispersion in distilled water: 8.5-9.6. It also contains about 7.2 - 8.4% sodium stearate as an emulsifier.

709852/0782

Claims (5)

May 11, 1977 15149-FTG-Cl SK / to PATENT CLAIMS 1. A stable, cosmetically elegant preparation for skin preparations in the form of an oil-in-water emulsion, containing: 5-10% glycerine; 2-5% glyceryl stearate; 1-3% lanolin; 2-6% stearic acid; 2- % isopropyl myristine; 1 - 3% ethoxylated lanolin with an average degree of ethoxylation of 20-85 mol of ethylene oxide and water; the pH of the preparation being about 5.5-7.5. 2. Preparation according to claim 1, which additionally contains 0.1-10% urea. 3. Preparation according to claim 2, wherein the urea content is 4-6%. Ί. Preparation according to any one of claims 1 to 3, wherein the ethoxylated lanolin has an average degree of ethoxylation of about 75 moles of ethylene oxide. 5. Preparation according to one of claims 1 to U, wherein additionally contain 0.1-0.5% sodium stearate. 709852/0782 ORIGINAL INSPECTED