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BR-102024018281-A2 - Concentrated oil-in-water (O/W) emulsion for dilutable waterless products and its preparation process.

BR102024018281A2BR 102024018281 A2BR102024018281 A2BR 102024018281A2BR-102024018281-A2

Abstract

This invention relates to a concentrated oil-in-water (O/W) emulsion intended for cosmetic products. This emulsion is designed to be waterless, using a minimal amount of water during its initial formulation, with the possibility of being subsequently diluted by the consumer as desired. The invention targets the hair cosmetics sector, offering a more sustainable alternative with less environmental impact compared to traditional market products. The concentrated emulsion can be applied in other areas of cosmetics that benefit from concentrated and dilutable formulations. The emulsion provides benefits such as the incorporation of higher concentrations of oily active ingredients, reduced packaging, costs, energy consumption, and pollutant emissions generated by transportation, thanks to the reduction in product volume. Additionally, the emulsion ensures practicality for the end user, maintaining the effectiveness and quality of cosmetic products even after dilution in water.

Inventors

  • GABRIELA OLIVA FONSECA
  • ANA MARIA PERCEBOM SETTE DA SILVA
  • KARINA OLIVEIRA LIMA

Assignees

  • FACULDADES CATOLICAS

Dates

Publication Date
20260317
Application Date
20240905

Claims (20)

  1. 1- CONCENTRATED OIL-IN-WATER (O/W) EMULSION FOR WATERLESS DILUABLE PRODUCTS, characterized by comprising: i. at least one cationic surfactant or a mixture of cationic surfactants, at a concentration of up to 6% by mass of the emulsion; ii. at least one oil or a mixture of oils, at a concentration of 35 to 75% by mass of the emulsion; iii. at least one wax or a mixture of waxes, at a concentration of 1 to 14% by mass of the emulsion; iv. water, at a concentration of up to 60% by mass of the emulsion; v. at least one water-soluble thickening polymer, at a concentration of 0.1 to 5% by mass of the emulsion; wherein the concentrated emulsion is configured to be diluted in water.
  2. 2- CONCENTRATED EMULSION, according to claim 1, characterized by the cationic surfactant or mixture of cationic surfactants preferably having a concentration of up to 4% by mass of the emulsion for monoalkyl surfactants or a mixture of surfactants containing monoalkyl and/or dialkyl molecules, wherein the cationic surfactant is not polymeric and is selected from the group consisting of monoalkyl and dialkyl quaternary ammonium salts, monoalkyl amidoamines, combinations of monoalkyl amidoamines with dialkyl and/or monoalkyl quaternary ammonium salts.
  3. 3- CONCENTRATED EMULSION, according to claim 1, characterized by the cationic surfactant or mixture of cationic surfactants preferably having a concentration of up to 2% by mass of the emulsion for dialkyl surfactants.
  4. 4- CONCENTRATED EMULSION, according to claim 2, characterized by the monoalkyl amidoamines being selected from the group consisting of stearamidopropyl dimethylamine, stearamidopropyl diethylamine, stearamidoethyl dimethylamine, palmitamidopropyl dimethylamine, palmitoamidopropyl diethylamine, behenamidopropyl dimethylamine, behenamidopropyl diethylamine, behenamidoethyl dimethylamine, among others of the same family.
  5. 5- CONCENTRATED EMULSION, according to claim 2, characterized in that the monoalkyl quaternary ammonium salts are selected from the group consisting of hydrocarbon chains containing from 12 to 30 carbon atoms, preferably from 16 to 24 carbon atoms, more preferably from 18 to 22 carbon atoms.
  6. 6- CONCENTRATED EMULSION, according to claim 5, characterized by the monoalkyl quaternary ammonium salts being cetrimonium chloride, steartrimonium chloride, and behentrimonium chloride, among others of the same family.
  7. 7- CONCENTRATED EMULSION, according to claim 2, characterized in that the quaternary dialkyl ammonium salts are selected from the group consisting of alkyl chains containing from 12 to 30 carbon atoms, preferably from 16 to 24 carbon atoms, more preferably from 18 to 22 carbon atoms.
  8. 8- CONCENTRATED EMULSION, according to claim 7, characterized by the quaternary dialkyl ammonium salts being distearyl dimethylammonium chloride, distearoyl dimethylammonium chloride, dicetyl dimethylammonium chloride and dialkyl (14-18) dimethylammonium chloride, among others of the same family.
  9. 9- CONCENTRATED EMULSION, according to claim 1, characterized in that the oil or mixture of oils preferably has a concentration of 75% by volume of the emulsion.
  10. 10- CONCENTRATED EMULSION, according to claim 1, characterized in that the oil or mixture of oils is selected from the group consisting of vegetable oils, mineral oils, silicone oils and synthetic oils.
  11. 11- CONCENTRATED EMULSION, according to claim 1, characterized in that the wax or mixture of waxes is selected from the group consisting of esters, fatty alcohols, fatty acids, surfactants and polymers.
  12. 12- CONCENTRATED EMULSION, according to claim 1, characterized in that the wax or mixture of waxes are preferably fatty alcohols, more preferably cetostearyl alcohol, which represents a mixture of cetyl alcohol and stearic alcohol in a proportion of 60% and 40% by mass.
  13. 13- CONCENTRATED EMULSION, according to claim 1, characterized in that the water preferably has a concentration of up to 25% by volume of the emulsion.
  14. 14- CONCENTRATED EMULSION, according to claim 1, characterized in that the water-soluble thickening polymer is selected from the group consisting of gums, starches, amylopectins, carrageenans, carbomers, polyacrylamides, polyethylene glycols, polyquaterniums, agar, pectins, polyacrylates, celluloses, and their derivatives.
  15. 15- CONCENTRATED EMULSION, according to claim 14, characterized in that the water-soluble thickening polymer is preferably polyquaternium-10.
  16. 16- CONCENTRATED EMULSION, according to claim 1, characterized in that the water-soluble thickening polymer is preferably combined with a water-soluble film-forming polymer, which represents 2% to 8% by mass of the emulsion.
  17. 17- CONCENTRATED EMULSION, according to claim 18, characterized in that the soluble film-forming polymer is selected from the group consisting of PVP (polyvinylpyrrolidone), PVA (polyvinyl alcohol), modified polyurethanes, starches, polyquaterniums, chitosan, and their derivatives.
  18. 18- CONCENTRATED EMULSION, according to claim 17, characterized in that the water-soluble film-forming polymer is preferably hydrolyzed corn starch.
  19. 19- CONCENTRATED EMULSION, according to claim 1, characterized by further comprising the addition of water-soluble ingredients, selected from the group consisting of preservatives, antioxidants, aqueous actives, peptides, pH regulators, vitamins, colorants, humectants, proteins and chelating agents.
  20. 20- CONCENTRATED EMULSION, according to claim 19, characterized by further comprising the addition of water-insoluble ingredients, selected from the group consisting of fragrances, oily actives, butters, emollients, plant extracts, sunscreens and polymers.

Description

Field of Invention [001] The present invention relates to a concentrated oil-in-water (O/W) emulsion for use in cosmetic products. This emulsion is designed to be waterless, using a minimal amount of water in its initial formulation, with the possibility of being subsequently diluted by the consumer as desired. The invention is applicable to the hair cosmetics sector, aiming at a more sustainable alternative with less environmental impact compared to traditional products available on the market, and can also be used in other areas of cosmetics that benefit from concentrated and dilutable formulations. Description of the State of the Art [002] Currently, the cosmetics industry faces a growing challenge in developing products that not only meet consumer expectations but are also environmentally sustainable. Traditionally, cosmetic formulations contain between 60% and 80% water, which represents a significant environmental and transportation impact. The emerging trend of "Waterless Beauty" seeks to mitigate these impacts by creating cosmetics that use little or no water in their composition. This approach contributes to reducing energy consumption in water heating and cooling processes during production, as well as decreasing costs and pollutant emissions associated with transportation, due to the lower weight and volume of the products. However, currently available waterless products, such as shampoo and conditioner bars, face problems related to consumer acceptance. These products do not provide the same sensory experience and ease of use as traditional water-based formulations, resulting in less convenient application and lower user satisfaction. Furthermore, the texture and application of these formulations may be compromised, leading to lower efficiency. [003] Considering that consumers are accustomed to applying a fixed amount of product, it is essential to develop a strategy to avoid overuse of concentrated products. A viable solution is to offer consumers the option of easily and quickly diluting the product at home, ensuring that the physicochemical properties, such as stability, sensory and rheological characteristics, remain adequate after dilution. In addition, it is important to ensure that consumers also have the option of not diluting the product and only using a smaller amount, saving water, as they prefer. [004] Currently, there are no proposals in the literature for creams with these characteristics, and combining all these requirements represents a significant challenge. To overcome it, it is necessary to investigate the combination of various preparation parameters and different stabilizing ingredients, such as surfactants and polymers, among others. This is important to control the properties of concentrated O/W emulsions, such as rheological properties, interfacial tension between the aqueous and oily phases, volume of the internal phase, viscosity of the external phase, and droplet size, the latter preferably being as small as possible to ensure high stability. [005] Emulsions are widely recognized in the cosmetics industry for their rheological and sensory properties, which are fundamental to consumer satisfaction. In particular, oil-in-water (O/W) emulsions have the advantage of having a light, non-greasy texture. However, these emulsions traditionally contain a high concentration of water (approximately 80%), which contradicts environmental sustainability goals. In contrast, water-in-oil (W/O) emulsions have a low water content, but often result in an oily feel and difficulty rinsing, which can be a limiting factor for cosmetics, especially for hair and skin care products. [006] There are several documents in the technical and scientific literature that deal with the use of concentrated oil-in-water (O/W) emulsions in cosmetic formulations. These documents include studies on the preparation, stability and application of concentrated emulsions, highlighting their effectiveness and potential in personal care products. [007] Document US2015/0099638A1 discloses stabilizing compositions for concentrated O/W emulsions that can be diluted in water. However, these stabilizing compositions necessarily need to contain a gemini surfactant, a sugar-derived compound, and a hydrophobically modified polymer. This requirement limits the versatility of the formulation, restricting the cosmetic base to specific ingredients that may not be compatible with all types of cosmetic applications or formulation preferences. The restrictions imposed by the need to use specific gemini surfactants and polymers can also increase production costs and limit the capacity for innovation in the formulation of new products. For example, gemini surfactants are known for their unique surface tension-reducing properties, but their compatibility with other cosmetic ingredients may be limited, compromising stability and desired performance. Furthermore, the focus of this invention is to utilize small concentrations of the af