CROSS-REFERENCE TO RELATED APPLICATION

This application is a U.S. National-Stage entry under 35 U.S.C. § 371 based on International Application No. PCT/EP2018/079783, filed Oct. 31, 2018, which was published under PCT Article 21(2) and which claims priority to German Application No. 10 2017 223 031.2, filed Dec. 18, 2017, which are all hereby incorporated in their entirety by reference.

TECHNICAL FIELD

The present disclosure is in the field of cosmetics and relates to a product for oxidative color change of keratinous fibers, in particular human hair, comprising an oxidant-containing composition packaged in a packaging. The oxidizing agent-containing composition comprises a thickening agent from the group of xanthanes. The packaging is manufactured from a special multi-layer film composite system, the wall of which comprises at least two polymeric layers and a barrier layer. The barrier layer has a permeation barrier effect for gases and water vapor. The barrier layer comprises a silicon oxide.

BACKGROUND

Changing the color of keratinous fibers, especially hair, is an important area of modern cosmetics. The appearance of the hair may be adapted to current fashion trends as well as to the individual wishes of each person. The expert knows various methods for changing the color of hair. The hair color may be changed temporarily by using direct dyes. In this process, already formed dyes diffuse from the dye into the hair fiber. Dyeing with direct dyes is associated with a low level of hair damage, but a disadvantage is the low durability and the fast washability of the colorations obtained with direct dyes.

If the consumer desires a long-lasting color result or a color shade that is lighter than the original hair color, oxidative color modifiers are usually used. For permanent, intensive colorations with corresponding fastness properties, so-called oxidative colorants are used. Such dyes usually contain oxidative colorant precursors, so-called developer components and coupler components, which form the actual dyes under the influence of oxidants usually hydrogen peroxides. Oxidative colorants are exemplified by excellent, long-lasting dyeing results.

Oxidative color modifiers are usually marketed in the form of two-component agents, in which two different compositions are separately packaged in two separate packagings and are not mixed together until shortly before use. The first composition is a formulation—usually acidic for stability reasons—which contains, for example, hydrogen peroxide in concentrations of from about 1.5 to about 12% by weight as an oxidizing agent. The oxidizing agent formulation is usually in the form of an emulsion or dispersion and is usually provided in a plastic bottle with a resealable outlet opening (developer bottle).

This oxidizing agent formulation is mixed with a second composition before use. This second composition is an alkaline formulation which is often in the form of a cream or a gel and which, if a color change is desired at the same time as the brightening, also contains at least one oxidative colorant precursor. This second composition may, for example, be provided in the form of a tube or in the form of a plastic or glass container.

In the usual application form described above, the second composition, which contains the alkalizing agent and/or the oxidative colorant precursors, is transferred from the tube or container into the developer bottle and then mixed by shaking with the hydrogen peroxide composition already in the developer bottle. In this way, the application mixture is prepared in the developer bottle. Application to the hair is then carried out via a small spout or outlet opening at the top of the developer bottle. The spout or outlet opening is opened after shaking and the application mixture may be removed by pressing the flexible developer bottle.

The use of the developer bottle requires a certain routine from the user, so that some users prefer to prepare the application mixture in a mixing bowl and apply it with a brush.

When preparing the application mixture in a bowl, both components—the first composition containing the oxidizing agent and the second composition containing an alkalizing agent and/or oxidative colorant precursors are completely transferred into a bowl or similar vessel and stirred there, for example with the aid of a brush. The application mixture is then removed from the mixing bowl using the brush. With this form of application, the use of a voluminous and expensive developer bottle is not necessary, and the search continues for inexpensive and material-saving packaging forms for the oxidizing agent composition.

In this context, packaging in pocket or bag form, which are usually made of plastic films or metal foils, are an inexpensive form of packaging with low material consumption.

Such packaging may be produced, for example, by gluing or hot pressing two plastic foils lying one on top of the other, with the gluing taking place on all edges of the foils. The interior of the packaging (i.e. the plastic bag) created by the bonding may then be filled with the desired cosmetic composition. The packaging may be opened by tearing or cutting open the plastic bag.

However, filling oxidizing agent compositions into such packaging is associated with problems caused by the reactivity of the oxidizing agent. Oxidizing agents are highly reactive substances which—depending on the storage conditions and the presence of decomposing impurities—decompose in small amounts and produce oxygen (i.e. gas).

The developer bottles known from the state of the art are usually only filled with the oxidizing agent composition to a maximum of half, usually only to a third of their internal volume. As a rule, developer bottles are made of polyethylene. Since polyethylene is permeable to both water vapor and other gases, there is no or only very slight excess pressure in the developer bottle. In addition, developer bottles are usually provided with strong, thick walls and a sturdy screw cap, so that the diffusion of water vapor or gases through the thickness of the walls is reduced and a slight increase in pressure within the bottle has no negative effects.

In contrast, bag-shaped packaging is usually completely filled with the liquid composition, and there is practically no excess air space in the filled bag. In addition, such packaging should be flexible, and when opened (e.g. torn open or cut open) there should be no uncontrolled escape of the composition. For this reason, when packaging liquid compositions, the creation of excess pressure in the packaging should be avoided if possible.

If an oxidizing agent composition is in such packaging, the gas (oxygen) produced during storage may cause the package to expand. Since the edges of the package are usually only glued together, in the worst case, strong inflation may lead to bursting of the packaging. For these reasons, when storing oxidizing agent-containing compositions, the choice of the film material of which the packaging is made is of great importance.

Packaging made of pure plastic such as polyethylene or polypropylene are permeable to both water vapor and gases. When storing a composition containing oxidizing agents in polyethylene or polypropylene packaging, the packaging does not expand. Due to the high permeability of the comparatively thin film of the packaging to water vapor, however, the water content of the composition is reduced. If the composition is stored in the packaging for several weeks or months, the water loss exceeds the maximum value permitted for adequate storage stability.

The production of suitable packaging for formulations containing hydrogen peroxide is a challenge. The above mentioned properties for the permeability of oxygen and water vapor have to be adjusted in such a way that a sufficient storage stability is given. The layer thickness of the film should be kept as low as possible for environmental reasons and to preserve resources. Furthermore, the layer thickness naturally also has an influence on the manufacturing costs. Against this background, thin layers are desired, but these do not always guarantee sufficient mechanical strength. If different materials are combined in a multi-layer film in order to satisfy a wide range of requirements, the manufacturability of the multi-layer film must also be guaranteed. Certain materials cannot be combined with each other because the cohesion between layers is not always sufficient or because their processing temperatures may be so different that joint processing is difficult.

Finally, the film materials are of great importance, especially when storing a multi-component system, as substances from the multi-component system can diffuse into the films and promote the detachment of layers forming the film. The choice of components of a hydrogen peroxide-containing formulation therefore also has an impact on the choice of packaging.

BRIEF SUMMARY

One objective of the present application was to package hydrogen peroxide-containing formulations in such a way that the mechanical strength of the packaging is sufficiently high to allow safe storage, but that easy access to the ingredients is guaranteed.

Surprisingly, it has now been found that oxidizing agent-containing compositions may be packaged where the water vapor permeability is low and inflation may be reduced by allowing the film to have a certain level of oxygen permeability. The films include a special film composite system and also have a barrier layer. By reducing the water vapor permeability, but adjusting the oxygen permeability to a sufficiently high level, the tendency to expand due to oxygen, which is formed from the hydrogen peroxide, is reduced and the mechanical strength is increased over time.

In an exemplary embodiment, a cosmetic product for modifying the natural color of keratinous fibers, such as human hair, includes (i) at least one packaging comprising at least one multi-layer film comprising at least one first polymer layer, at least one second polymer layer and at least one barrier layer, and (ii) at least one cosmetic composition packaged and included in the packaging. The cosmetic composition includes (a) at least one oxidizing compound and (b) at least one thickening agent, selected from the xanthanes group. The first polymer layer is formed from polyethylene terephthalate or polyethylene naphthalate; the second polymer layer is formed from a polyolefin; and the barrier layer is formed from a polyester provided with an SiOxlayer.

