MXPA99000359A - Cosmetic emulsions of oil type in water containing ta - Google Patents

Abstract

The present invention relates to cosmetic emulsions, in particular cosmetic emulsions of the oil-in-water type containing high levels of talcum powder, with stability and improved cosmetic and properties in relation to conventional powder talc and to other oil-in-water cosmetic emulsions containing such

Description

Cosmetic emulsions of the oil type in water containing talc Field of the Invention The present invention relates to cosmetic emulsions, in particular cosmetic emulsions of the oil-in-water type, containing high talcumines, with stability and improved cosmetic properties in relation to conventional talcum powder and to other oil-in-water cosmetic emulsions containing talcum powder.

BACKGROUND OF THE INVENTION The term "talcum powder" as used herein, encompasses dusty compounds, suitable for topical use and encompassing any oxides, bismuth chloride, starches, such as modified corn and, in particular, the group of compounds known as silicates which, in turn, include zinc, calcium, aluminum silicates and hydrous magnesium silicate. Magnesium silicate hydrate, as well as the other compounds covered by the term "talcum powder", has great market penetration associated with cosmetic powders, resulting in a product with cosmetic properties known for a long time and that give the user a sensation refreshing and pleasant, being able, even, to be applied with therapeutic purposes. On the other hand, the prolonged use of such powdery cosmetics containing talcum powder exposes its user to the risk of contraction of respiratory annoyances, by the inhalation of talcum powder or its adjuvants and mixtures thereof. In the case of cosmetic powders containing magnesium silicate, for example, the discomfort in question is silicose, a bad one derived from the inhalation of such silicate. This problem manifests itself with a greater or lesser amount of inhaled silicate, depending on the sensitivity and characteristics of each person and becomes increasingly worrisome when talking about the application of talc in children, especially in newborns. In spite of that, cosmetic products containing magnesium silicate hydrate have good acceptance by their users, due to their property of water absorption. Some time ago, the incorporation of talcum powder into other cosmetic bases of fluid or even creamy consistency that would prevent the dissipation and consequent inconvenient inhalation of talcum powder was proposed. An example of this are cosmetic emulsions containing talcum powder, for example, water-in-oil or oil-in-water, resulting in a product that, because it is not dusty, would eliminate the already mentioned risk of silicose contraction. Examples of talcum powder incorporated into emulsions of this nature and for cosmetic purposes, among others, are found in various patent documents, some of which are listed below merely by way of example, and which are incorporated herein by reference: US Pat. No. 5,684,178 November 4, 1997 from L'Óreal, JP 6158096 of June 7, 1994, from Shiseido Co Ltd., EP 519777 of December 23, 1992 from Lab. Biologie Vegetale Yves Rocher, US 4988503 of January 29, 1991 from Revlon , Inc., as well as in Pl 8801105 of March 11, 1988 of Johnson & Johnson. Generally speaking, what is known from the state of the art in relation to talc-containing cosmetic emulsions is that they effectively reduce the risk of silicose, but still leave something to be desired in other aspects. The state of the art is full of cosmetic emulsions containing talc, whose composition is complex and, therefore, very expensive, resulting in low penetration products on the market and others with lower production cost, however, with result down of what the user wants. Even more disadvantageous is the fact that the talcum-containing cosmetic emulsions hitherto known are deficient in the faithful reproduction of the sensorial given by talcum powder, very much desired by the users. A desired sensory determined is characterized by the dry, soft and velvety touch with refreshing tones and with good extension by the individual and also, free of the feeling of adhesion on the skin. Thus, an object of the present invention is to provide a cosmetic emulsion of the oil-in-water type containing talcum powder and also comprising a non-volatile stage and volatile stage, which overcomes with broad advantages the typical deficiencies of such cosmetic emulsions reported here and , however, in an important way, reproduce as accurately as possible the sensorial supplied by talcum powder.

Another object of the present invention is to provide a cosmetic emulsion of the oil-in-water type containing high content of talcum powder and which is stable.

Compendium of the Invention The present invention relates to a cosmetic emulsion of the oil-in-water type containing talcum powder and comprising a non-volatile stage and a volatile stage, characterized in that it contains, by weight relative to the total weight of said cosmetic emulsion, talcum powder in a content of about 40% to 70% and non-volatile stage of about 5% to 14%.

Detailed description of the invention It was surprisingly noted that, in general, in a certain talcum-containing cosmetic emulsion, a high content of talcum powder, associated with certain non-volatile stage tenors, are highly responsible for optimum sensory characteristics, like talcum powder. With equal importance, it was observed that selected proportions between the non-volatile stage and the volatile stage contribute enormously to the stability of a certain cosmetic emulsion with a high content of talc, as well as to obtain the desired sensory. Certain selected chemical natures also contribute to the stability and sensory with the compounds of the non-volatile stage and the volatile stage of the cosmetic emulsion.

Equally important was the observation of the present inventors that the advantageous effects of the invention are even more prominent when the non-volatile stage is present in selected amounts in the cosmetic emulsion. For the purposes of the present invention, it was found that, in general, any oil-in-water cosmetic emulsion with powdered talcum powder of about 40% to 70% provides an advantageous and desired sensory in the manner of conventional talc. Studies carried out by the present inventors show that the effects of the invention, especially the sensory supply of the cosmetic emulsion in the manner of conventional talc, begin to be felt when, in a cosmetic emulsion of the oil-in-water type containing talcum powder, the talc powder content is about 40% and in the non-volatile stage it is present in a content of less than about 5% to 14% by weight in relation to the total weight of the cosmetic emulsion. Tests carried out by the inventors in emulsions with non-volatile stage outside the level described above and with talcum powder levels between 40% to 70% resulted in a cosmetic emulsion of sensorial far from desired. These studies showed, however, that such cosmetic emulsions exhibit improved stability and sensory when certain weight proportions are selected relative to the weight of the cosmetic emulsion to the non-volatile stage and to the volatile stage. The stability and sensory of a certain cosmetic emulsion is further improved when compounds of selected natures are used in the non-volatile and volatile stages. According to the invention, a cosmetic emulsion of the oil-in-water type consists of a non-volatile and a volatile stage. According to what has been reported above, the stability and the sensory provided by a cosmetic emulsion according to the invention are shown to be substantially favorable when the ratio between the non-volatile stage and the volatile stage is from approximately 9% to almost 88%, preferably between 18% and 44% and more preferably from 20% to 30%, a certain proportion of approximately 22% between stages being considered ideal. The non-volatile stage includes emollients, emulsifiers, thickeners, stabilizers, acidulants and preservatives. According to the invention, useful compounds for the emollients are selected from oils, silicones, stearates and their mixtures, the latter being able to be selected from 2-ethylhexyl isostearate, octyl palmitate and isopropyl myristate and mixtures thereof; for the emulsifiers, the compounds are selected from surfactants, fatty alcohols such as ethoxylated keto stearyl alcohols, laurates, phospholipids, sesquistearates and stearates such as glyceryl monostearate and mixtures thereof; for thickeners, the compounds are selected from fatty alcohols such as, for example, cetyl alcohol, ketosterol alcohol, or natural gums such as xanthan gum or synthetic polymers in general and mixtures thereof; as stabilizers, compounds are selected from butyl hydroxytoluene or ethylene salt of aminotetrasodium and their mixtures, the choice of acidulants, still according to the invention, is made by the selection of compounds between citric or boric acid and their mixtures; and, regarding condoms, the choice is of compounds between parabens, imidazolidinyl urea and its derivatives and 2-bromo 2-nitropropane 1-3 diol, methyldibromo glutaronitrile, methylchlorothiazolinone and methylthiazolinone, phenoxynol, boric acid, sorbic acid and mixtures thereof. To further emphasize the effects of the invention on the sensory as close as possible to talcum powder and high stability, the non-volatile compounds are present from about 5% to 14%, preferably about 11% by weight relative to the total weight of the cosmetic emulsion. The invention provides, in addition, that the most favorable condom combinations are those of parabens associated with methylchlorothiazolinone and methylthiazolinone, phenoxynol and boric acid. Methylchlorothiazolinone and methylthiazolinone alone, can be somewhat inconvenient in an application turned over to children and newborns because their inclusion is required at a higher concentration than the previous associations of condoms. Concerning the volatile stage, it includes compounds selected from water, volatile silicones such as cyclomethicone, vegetable extracts that can be alcoholic, (illegible) fragrances and essential oils and their mixtures. The compounds listed herein as being useful for the invention may vary from case to case, however any cosmetic emulsion of the oil-in-water type with a high content of talc, that is, from about 40% to 70%, is comprised by the present invention. the non-volatile stage is from about 5% to 14%. To better illustrate the invention, the following examples are described whose data, compounds, tenors and other parameters and information in general refer merely to some embodiments and should not be interpreted as defining the object of the invention, which is given by the claims presented below. All the amounts of the compounds of the following examples are expressed as a percentage weight relative to the total weight of the respective cosmetic emulsions, unless otherwise indicated and in these examples the term "volatile" refers exclusively to water, fragrance and cyclomethicone.

Example I: Powder talcum content of about 40%, non-volatile stage tenor of about 8% ratio between the non-volatile stage and the volatile stage of about 15%.

A cosmetic emulsion was prepared comprising the following compounds with their percentages expressed in Table I: Table I Example II: Powder talcum content of approximately 40%, tenor of the non-volatile stage of approximately 12% y. ratio between the non-volatile stage and the volatile stage of approximately 25%.

A cosmetic emulsion was prepared comprising the following compounds with their percentages expressed in Table II: Table II Example III: Powder talcum content of approximately 40%, tenor of the non-volatile stage of approximately 11% and proportion between the non-volatile stage and the volatile stage of approximately 22%.

A cosmetic emulsion was prepared comprising the following compounds with their percentages expressed in Table III: Table III To confirm the advantageous effects of the invention, a conventional sensory evaluation was carried out with 12 people. To these individuals, 3 samples of product applied on the forearm were submitted, being sample 1, according to the invention and described in Table III of Example III above; sample 2, composed of an oil-in-water emulsion containing talcum powder in a content of 40%, non-volatile stage of approximately 16% and volatile stage 44% and comprising: and sample 3, also composed of an oil-in-water emulsion containing talcum powder, however, in a content of 27.5%, non-volatile stage in approximately 1 ~ "09% and volatile stage 61.6% and covering: According to the calculated results: i) 100% of the individuals considered the sample 1, according to the invention, as providing a sensorial substantially similar to that of conventional talcum, because it has a drier touch and with good distribution; ii) 80% of those individuals considered the product of sample 2 as that of a sensorial more distant from talc and sample 3 even more distant from the sensory one of conventional talc; Y iii) 20% of those individuals considered the product of sample 3 as a sensorial more distant from talc and sample 2 even more distant from the conventional talc sensorial.

Another advantage of the invention is that, within what was established for the invention, slight variations in the emulsion can be made, according to the purpose of the application by the users, always keeping the sensorial as faithfully as possible in the form of conventional talc.

For example, for infantile use, where the absorption of accumulated substance in the folds of the skin is desired, the use of an emulsion, according to the invention, in which talcum powder is present in a content of approximately 40%; the non-volatile content is about 11% and the ratio between the non-volatile stage and the volatile stage is about 22%, characteristics that grant a sensory in the conventional talc form with high extension and softness.

Claims (12)

Claims

1. Cosmetic emulsion of the oil-in-water type containing talcum powder and comprising a non-volatile stage and a volatile stage, characterized in that it contains, in weight relative to the total weight of said cosmetic emulsion, talcum powder in a content of approximately 40% to 70% and non-volatile stage of about 5% to 14%.

Cosmetic emulsion according to claim 1, characterized in that the non-volatile stage contains compounds selected from emollients, emulsifiers, thickeners, stabilizers, acidulants and preservatives and the volatile stage contains compounds selected from water, volatile silicones such as cyclomethicone, alcoholic or non-alcoholic vegetable extracts, glycolic or aqueous, fragrances and essential oils.

Cosmetic emulsion according to any one of the preceding claims, characterized in that it contains, by weight relative to the total weight of said cosmetic emulsion, talcum powder in a content of approximately 40% and non-volatile stage of approximately 11%.

Cosmetic emulsion according to any one of the preceding claims, characterized in that the ratio between the non-volatile stage and the volatile stage is from about 9% up to almost 88%, preferably between 18% and 44%, with more preference of 20% to 30% and preferably even higher, of approximately 22%.

Cosmetic emulsion according to any one of the preceding claims, characterized by the talcum powder content of approximately 40%; non-volatile content of approximately 11% and ratio between the non-volatile stage and the volatile stage of approximately 22%.

Cosmetic emulsion according to claim 2, characterized in that the non-volatile stage comprises emollients selected from oils, silicones, stearates and their mixtures, the latter being selected from 2-ethylhexyl isostearate, octyl palmitate and myristate isopropyl and its mixtures; emulsifiers, selected from surfactants, fatty alcohols such as ethoxylated keto stearyl alcohols, laurates, phospholipids, sesquistearates and stearates such as glyceryl monostearate and mixtures thereof; thickeners selected from fatty alcohols such as cetyl alcohol, cetoesteryl alcohol, natural gums such as xanthan gum, synthetic polymers in general and their mixtures, stabilizers, selected from butyl hydroxytoluene, ethylene tetrasodium ethylene salt and their mixtures; acidulants selected from citric acid, boric acid, sorbic acid and mixtures thereof; and preservatives selected from parabens, imidazolidinyl urea and its derivatives and 2-bromo-2-nitropropane 1-3 diol, methyldibromo glutaronitrile, methylchlorothiazolinone and methylthiazolinone, phenoxytanol, boric acid, sorbic acid and mixtures thereof; and the volatile stage includes compounds selected from water, volatile silicones such as cyclomethicone, alcoholic, glycolic, aqueous extracts, fragrances, essential oils and their mixtures.

7. Emulsion according to any one of claims 1 to 6, characterized in that it has the following composition in percentage weight relative to the total weight of the emulsion:

8. Emulsion according to any one of claims 1 to 6, characterized in that it has the following composition in percentage weight relative to the total weight of the emulsion:

9. Emulsion according to any one of claims 1 to 6, characterized in that it has the following composition in percentage weight relative to the total weight of the emulsion:

10. Cosmetic emulsion according to any one of claims 1 to 9, characterized in that the condoms are selected from at least one of the groups composed of parabens associated with methylchlorothiazolinone, methylthiazolinone, phenoxyanol; boric acid; methylchlorothiazolinone and methylthiazolinone.

11. Cosmetic emulsion according to claim 10, characterized in that the condoms are selected from the group of parabens associated with methylchlorothiazolinone, methylthiazolinone and phenoxyanol. Cosmetic emulsion according to any one of the preceding claims, characterized in that the powder talc is hydrated magnesium silicate.