SK120698A3 - Two-phase skin care agents - Google Patents

Abstract

Two-phase skin care agents, specially two-phase skin creams, comprising two separated plastic flowing constituents packed in a tube which can be pressed out of the tube in the form of parallel, concentric or striped strips. Said agents can be advantageously produced when the first component has a continuous aqueous phase and the second component has a continuous oil phase. Preferably, both phases are differently colored or pigmented. Preferably, an aqueous gel or an oil in water emulsion are used as a continuous aqueous phase, and a thickened oil or water-in-oil emulsion is used as a continuous oil phase.

Description

Biphasic skin care compositions, in particular biphasic skin creams consisting of two separate, plastically flowing ingredients which are filled into a single tube and can be extruded together in the form of parallel, concentric or striped strips, can be advantageously produced when the first ingredient is a continuous aqueous phase and the second component a continuous oil phase. Preferably, the two phases are differently colored or pigmented. As the continuous aqueous phase, an aqueous gel or oil-in-water emulsion is preferred, and a concentrated oil or water-in-oil emulsion is used as the continuous oil phase.

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Skin care product

Technical field

The invention relates to a two-phase skin care composition, preferably a two-phase skin cream which is filled into a tube and can be extruded in the form of parallel, concentric or striped strips.

BACKGROUND OF THE INVENTION

Various cream filling tubes are known which consist of two components and which are to be held separately before use or which are differently colored or pigmented and which can be extruded from the tube in the form of parallel, concentric or striped bands. However, this technique has so far been implemented to a greater extent only with toothpastes.

The reason could be that in practice there are numerous problems, essentially based on the fact that the components should not mix with each other before being extruded from the tube, so that the separately held components of these components do not react prematurely with each other, or remained recognizable as separate phases, for example in the form of differently colored bands.

For example, according to DE-PS 820 268 it has been proposed to connect two individual tubes in a concentric arrangement into one tube and to shape the openings of the two individual tubes so that, under pressure on the outer tube, the two components protrude as a single strip with core from the inner tube.

However, such an arrangement is expensive and technically difficult to implement. In the strip dispensers of U.S. Pat. No. 2,789,731, U.S. Pat. No. 2,935,231, DE-A-2,141,436, however, there is a danger that the nasal cream and the striping cream are mixed at the phase boundary and can no longer be recognized on the strip being extruded from the tube. sharp phase boundaries.

Therefore, the task has also been to find a solution for skin and body care products which allows the application of pasty and creamy preparations from tubes in the extrusion form of multi-phase strips, the phases of which are preferably different

-2sfarbené. Such products not only have a particularly attractive appeal to the user, but also allow the active ingredients to be applied to the skin which, upon prolonged storage, interact with each other or can be deactivated.

SUMMARY OF THE INVENTION

This object has been accomplished according to the present invention by means of skin or body care compositions consisting of two separate, plastically flowing components which are filled into one tube and can be coextruded together in the form of parallel, concentric or striped strips of both components, a continuous aqueous phase and a second continuous oil phase.

Skin or body care compositions herein are those which serve to protect and treat the skin or hair and are applied in the form of plastic flowing compositions to the skin or hair surface and remain there. Plastic creep is referred to as rheological behavior, which is typical of pasty, creamy and gel-like systems, and is characterized by a creep limit that, at a shear stress less than this creep limit, makes the product look like a rigid body. The flow of the substance is observed only when the shear stress is greater than the creep limit. The rheological behavior above the creep limit can be described using semiempirical state equations, such as the Bingham equation or the Casson equation.

Tubes that are suitable to displace two separate, plastically flowing components in the form of concentric or striped strips of the article have been described several times and have long been on the market for toothpaste with colored strips. These tubes are formed such that a small tube extends into the tube before the tube opening and has openings at the end facing the tube opening. The tube is filled in the space around the tube, for example, with a colored second component and a carrier component underneath it. The tube must interfere with the carrier component. By pressing on the tube, the carrier component is forced through the tube and to the other component, which is fed through the apertures to the strip of carrier cream and extruded therethrough. In this way, the two components project together in the form of a strip. Depending on the size and shape of the openings, the strip may have narrow or wide strips of the second component. When the opening has the shape of a circular slot, the carrier component may be

-3 completely wrapped in second phase. By shaping the opening of the tube, the product can be either cylindrical, i.e. with a circular cross-section or a polygonal cross-section.

An aqueous gel, an aqueous dispersion, an oil-in-water emulsion or a water-in-oil-in-water emulsion, an aqueous microemulsion or a mixture of such systems may be used as the continuous aqueous phase component of the present invention. It is only important that the water forms the external, continuous phase so that the system is spontaneously dilutable with water.

The aqueous gel used can be, for example, hydrocolloids or surfactants or both a concentrated water system. Aqueous systems thickened with inorganic thickeners, for example silicas or layered silicates, are also suitable. By aqueous dispersion is meant a dispersion of solid particles in an aqueous medium, for example a dispersion of pigments, waxes or polymer particles. Oil-in-water emulsions and water-in-oil-in-water emulsions are the most well known bases of skin care cosmetics. All of these components with a continuous aqueous phase should have a viscosity of more than 0.1 Pa.s (20 ° C), preferably more than 1 Pa.s (20 ° C) (dynamic densities) with suitable thickeners or dispersed or emulsified phase content. viscosity above the creep limit).

Oils and fats which have a viscosity of at least 0.1 Pa.s (20 ° C), preferably at least 1 Pa.s (20 ° C) due to their molecular structure or thickening by known thickeners are suitable as a component with a continuous oil phase. Suitable as such are, for example, petrolatum or other, at 20 [deg.] C., oily or plastically flowing vegetable, animal or synthetic fats and silicones. Low viscosity oils or those having no creep limit should be converted to a plastically flowable state using known oil-soluble thickeners, for example, soaps, oil-soluble polymers, organically modified layered silicates or dissolved waxes. Another possibility to bring the oils to a plastically flowing state is to emulsify the discontinuous aqueous phase, which may optionally be an oil-in-water emulsion. Water-in-oil or oil-in-water-in-oil emulsions formed in this way can be obtained by adjusting

-4 viscosities of the outer oil phase or the amount of the inner aqueous phase, such as plastically flowing systems (creams).

The continuous aqueous phase is preferably an aqueous gel or oil-in-water emulsion and a continuous oil phase of a thickened oil or water-in-oil emulsion. The two plastically flowing components preferably have a flow limit which is in the range of 50 to 500 Pa (Pascal).

Because of the high stability of the phase boundary against expansion or mixing, it is also advantageous if the difference between the creep limits of the two components is not more than 20%, based on the higher creep limit.

In addition to the thickeners or the emulsified phase, the two components of the biphasic skin care composition of the present invention may contain all of the components customary for the intended purpose at the appropriate concentrations.

Preferred are skin and body care compositions according to the present invention in which the two phases are differently colored or pigmented, and in this way exhibit a particularly attractive appearance of the strip of product emerging from the tube with a color pattern.

Suitable colorants are all water-soluble or oil-soluble dyes which are permitted for coloring cosmetic products. Thus, for example, the oil phase can be colored with oil-soluble dyes, or the aqueous phase can be scaled with dispersed pigments. It is also possible to prepare the aqueous phase as a clear, colored gel and the oil phase as a white or pigmented water-in-oil cream. Another variant is that, for example, the oil phase is formulated as a clear or colored gel and the aqueous phase is a pigmented, white oil-in-water cream.

In cooperation with the shaping of the tube opening and the number, size and shape of the openings through which the second component exits the tube, an aesthetically versatile arrangement of the product strip can be achieved.

In addition, various cosmetic active ingredients may be added to both components so that, for example, the aqueous phase may contain a cleaning and oil phase treating the active ingredients. Liposomes that are not stable in the oil phase can also be added to the aqueous phase. For example, active substances which are unstable or insoluble in the presence of water could be added to the oil phase.

-5 The following example is intended to illustrate the subject of the patent in more detail:

DETAILED DESCRIPTION OF THE INVENTION

An oil-in-water (O / V) nasal cream and a water-in-oil (I / O) striping cream with the following recipes were filled into a tube dispenser according to DE-A-3,841,775. The striping cream was a W / O night cream and the nasal cream was an O / W day cream. A total of 118 ml of nasal cream and 7 ml of striping cream were filled into a 125-ml tube.

Nasal Cream (O / W)

Stearic acid 8.0 wt. Cetyl / stearyl alcohol 1.5 wt. Cetyl / stearyl alcohol + 20 moles EO 2.0 wt. 2-octyldodecanol 5.0 wt. Cera Alba 3.0 wt. Paraffinum Liquidum 10.0 wt. P-propyl ester hydroxy 0.3 wt. tocopheryl acetate 2.0 wt. 3-Benzophenone 1.0 wt. propylene 5.0 wt. glycerol 5.0 wt. P-Hydroxybenzoic acid methyl ester 0.3 wt. triethanolamine 0.3 wt. Water ad 100 wt.

Striping Cream (W / O)

Dehymuls F 8.0 wt. Shea fat 5.0 wt. petrolatum 10.0 wt. Paraffinum Liquidum 5.0 wt. Metyiparabén 0.3 wt. tocopheryl acetate 2.0 wt. propylene glycol 5.0 wt. glycerol 5.0 wt. Magnesium sulphate 0.5 wt. phenoxyethanol 1.0 wt. Acid Orange 24 (C.l. 20170) 0.5 wt. Water ad 100 wt.

When the tube was extruded, a square band of carrier cream was obtained with orange-colored bands of W / O cream at the edges of the carrier band. The phase boundary between the carrier cream and the orange-colored bands remained more than 4 weeks.

Claims (4)

A skin and body care composition comprising two separate, plastically flowing components which are filled into a single tube and can be coextruded together in the form of parallel, concentric or striped strips of both components, characterized in that the first component is continuous the aqueous phase and the second component being a continuous oil phase. 2. The composition for skin or body according to claim 1, ^r ignating in that the two phases are differently colored or pigmented. * < The skin or body care composition according to claim 1 or 2, wherein the continuous aqueous phase is an aqueous gel or oil-in-water emulsion and the continuous oil phase is a thickened oil or water-in-oil emulsion. The skin or body care composition according to any one of claims 1 to 3, characterized in that the aqueous and oil phases have a creep limit of 50 to 500 Pa at 20 ° C.