Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2000-10-10
2002-11-26
Gupta, Yogendra N. (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S405000, C008S406000, C008S409000, C008S410000, C008S411000
Reexamination Certificate
active
06485528
ABSTRACT:
BACKGROUND OF THE INVENTION
Description of the Invention
The invention relates to agents for treating keratin fibers, consisting of at least two spatially separate preparations, to the use thereof, and to a method of treating human hair.
The requirements which users of agents for treating keratin fibers, in particular hair treatment agents, place on these agents have continuously increased over time. This has led inter alia to these agents consisting in many cases of an ever greater number of components in order to achieve all of the effects desired by the user in the most optimal manner possible. However, as the complexity of these mixtures increases, so too does the number of active ingredient combinations which, despite having the desired properties in a single formulation, particularly in the case of an aqueous mixture, are no longer storage-stable.
In the field of hair treatment, a number of agents are known which are in the form of separate preparations which are either mixed directly prior to application to the hair, or are applied to the hair one after the other in separate steps; for ease of handling for the user and not least to minimize packaging expenditure, in the development of new products, wherever possible formulation in the form of one agent is desired.
Should formulation in separate preparations which have to be mixed prior to application to the hair be absolutely unavoidable, then the mixing operation should be as rapid and uncomplicated as possible, and, as already mentioned above, the additional packaging expenditure be kept as low as possible.
We have now found that these requirements are satisfied to a high degree when the component to be stored separately, or the components to be stored separately are provided with an envelope which, when the 5 preparations are combined, permits mixing of the components of the two preparations in a period of time which is tolerable for the user. The period of time accepted by the user can generally be regarded as an interval of up to 5 minutes if the mixing operation of the two preparations is not combined with any further, laborious procedures, e.g. continuous stirring, of any kind.
The invention must then firstly provide an agent for treating keratin fibers, consisting of at least one aqueous preparation A and, spatially separate therefrom, at least one preparation B, which has an envelope of preparation B made from a material which permits the components of the two preparations to mix at 38° C. within 5 minutes when the preparation B is added to a preparation A.
A number of hair treatment agents are applied to the hair in gently warmed form. Warming is generally achieved by combining components which liberate heat on mixing. One component is often an anhydrous salt which dissolves in an aqueous phase with the liberation of heat; alternatively, it is also possible to use heats of neutralization, heats of mixing liquid components etc. The quantitative ratios of the components to be mixed are in these cases preferably adjusted such that the mixture adopts a temperature slightly above the temperature of the human body, i.e. about 38° C., within a very short time, i.e. a few seconds. In the case of this type of agent, it is therefore sufficient for the components of the enveloped preparation B to be mixed with the components of the aqueous preparation A within 5 minutes at a temperature of 38° C. Apart from occasional shaking of the mixture, no further activities on the part of the user should be necessary here.
The overwhelming majority of hair treatment agents are stored at room temperature and also applied to the hair at this temperature. According to a preferred embodiment of the invention, the envelope of the preparation B is thus chosen such that mixing of the components of the preparations A and B takes place within a maximum of 5 minutes even at room temperature, i.e. in particular a temperature of 20° C.
According to a preferred embodiment of the invention, the envelope of component B is a capsule.
Corresponding envelopes in capsule form are known from the field of pharmacy. One type of these capsules are films in capsule form, in which the substances to be enveloped are completely enclosed by a layer of the enveloping material, and the enveloped substances can be released again only following destruction of the envelope. In this connection, suitable materials for the envelope are preferably certain cellulose derivatives, polyacrylates, polymethacrylates, polyvinylpyrrolidones, and, in particular, polyvinyl alcohols. In this connection, express reference is made to the monograph by K. H. Bauer, K. H. Frömming and C. Führer, Pharmazeutische Technologie [Pharmaceutical Technology], Gustav Fischer Verlag, Stuttgart, Jena, Lübeck, Ulm, 4th edition, 1997, pages 315-323.
Two-part capsules generally consist of two cylindrical halves, each sealed at one end. The internal diameter of one half, which is also referred to as the capsule cap, is slightly larger than the external diameter of the other half, referred to as the capsule base, meaning that the two halves can be inserted into one another to envelope the component to be enclosed, the capsule being “bolted” by special devices. This type of capsule is also referred to as hard capsules and is a preferred envelope according to the invention. Suitable capsule materials are in principle both gelatins and also synthetic or natural polymers. Polyvinyl alcohol has proven to be a particularly suitable envelope material.
In accordance with a first preferred embodiment, the entire hard capsule consists of polyvinyl alcohol.
It may, however, also be provided that only part of the hard capsule, in particular the capsule cap or parts of the capsule cap, consists of a water-soluble material in accordance with the definition according to the invention. It is then possible, for example, to prepare the capsule base from a less water-soluble material. This allows greater flexibility in setting the desired mechanical properties, e.g. the rigidity, of the capsule. With regard to this envelope form, reference is likewise made to the monograph mentioned above by K. H. Bauer, K.-H. Frömming and C. Führer, pages 324-335.
The envelope can, however, also take the form of a pouch. Such pouches are produced in a known manner from polymer films, from which the individual pouches containing the ingredients are produced by sealing or gluing. Further information about such pouches is given, for example, in the article by J. Korn, Die Neue Verpackung [The New Package], 10, 1150-1155 (1962), and EP 493 392, in which pouches made of polyvinyl alcohol are disclosed for the dust-free packaging of bleaches.
Because of better handleability, particularly when the preparation B is added to a preparation A in a bottle with a relatively narrow neck, an envelope in the form of a capsule is preferred according to the invention.
It is further preferred that the envelope material consists of substances which additionally develop positive properties in hair treatment agents. In this connection as well, polyvinyl alcohol is a preferred envelope material because of its conditioning properties.
The thickness of the envelope is chosen by the person skilled in the art such that, on the one hand, a hermetic seal of the preparations to be enveloped is ensured, but, on the other hand, the mixing of the preparations A and B is not unnecessarily prolonged by too thick an envelope. Envelope thicknesses in the range from 10 to 30 micrometers have proven particularly suitable within the scope of the teaching according to the invention.
The teaching according to the invention is particularly suitable for agents which, in the preparation B, contain a constituent which is not storage-stable in the preparation A.
In accordance with a first preferred embodiment, this constituent is a perfume oil, a particular perfume component or a mixture of perfume oils.
Certain hair treatment agents comprise active ingredients which are unavoidable for achieving the desired properties or for formulating the agent, but develo
Bartels Holger
Hoepfner Stefan
Rohweder Sandra
Wolff Wolfgang
Elhilo Eisa
Gupta Yogendra N.
Hans Schwarzkopf GmbH & Co. KG
Harper Stephen D.
Murphy Glenn E. J.
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