FR2841155A1 - Production of a cosmetic product comprises granulating a powder and agglomerating the granules with other granules - Google Patents

Abstract

Production of a cosmetic product comprises granulating a powder with a binder, drying the granules, spraying the granules with a binder, agglomerating other granules around the sprayed granules, and drying the product. An independent claim is also included for a cosmetic product comprising granules that are based on a powder material and are agglomerated with a binder.

Description

thermal.

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  The present invention relates to a method of manufacturing a product

  cosmetic, such a cosmetic product and a use of a cosmetic product.

  Wile will find its application particularly for the production of make-up products and in particular for the application of product to the skin in the form of make-up.

or other powder.

  Document EP-A-0.327.739 discloses a composite material based on titanium and mica comprising mica and a first coating composed of dioxide

  of titanium which covers the surface of the mica.

  o This material also includes a second coating composed of particles

  pulverulent of at least one selected metal which covers the first coating.

  This composite material can be used as a dye, especially in the

cosmetic area.

  Its use as a pigment must however be accompanied by the presence

  other materials particularly having emollient properties.

  Furthermore, the hardness of the pearls obtained by the previous document is very high / high and does not allow a very fine application on the skin which is

  harmful to the final appearance of the cosmetic product once applied.

  The present invention makes it possible to remedy the drawbacks of the products and processes known hitherto and presents to do this a new process allowing the realization of a structure of a cosmetic product having the structure of a pearl having a cohesion certain while allowing a crushing and a decohesion of the pearl during ['application in particular by a simple effort of the user by means of a brush or other device for [' product application

cosmetic on the skin.

  The product according to the invention therefore has a coherent structure but is fragile, that is to say capable of being crushed or spread out by producing very fine particles which are particularly suitable for make-up products in order to produce a

  very fine effect on the skin.

  o Taking account of the size of the particles once applied, the application is

  particularly regular on the skin and homogeneous distribution.

  Another advantage of the invention is to provide a manufacturing process which

be quick to execute.

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  In addition, according to a variant of the invention, the outer layer of the cosmetic product can be given a different color so as to produce a surprise effect for the user at the time of application, the crushing of the product. cosmetic providing the appearance, under the outer layer, of a colored product

s different.

  Other objects and advantages will become apparent from the following description.

  of a preferred embodiment of the invention which is not, however, limiting.

  The present invention relates to a process for manufacturing a cosmetic product, characterized in that it comprises the following stages of o granulation: - impregnation of a pulverulent material with a binding agent to form grains, - drying of grains, - pulverization of a binding agent on the grains, - agglomeration of other grains around the pulverized grains,

- sbhage of the product obtained.

  This process can be presented according to the variants set out below: - a binding agent is used comprising one or more natural waxes in an alcoholic solution; o - the product obtained is sieved; - the spraying, agglomeration and drying stages are repeated until the desired size for the cosmetic product is obtained; - the dilution of the binding agent is increased as the granulation steps progress; s - the last stages of agglomeration are carried out with a pulverulent material of different color;

  - the granulation steps are carried out in a turbine.

  - a finishing covering is carried out with a pulverulent material which is not impregnated. o - the binding agent is chosen to limit the agglomeration force of the grains to a predetermined value corresponding to the average force applicable by new pressure.

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  The invention also relates to a cosmetic product characterized by the fact that it is composed of a plurality of grains based on a pulverulent material, said

  grains being agglomerated by a binding agent.

  This product can be presented in the embodiments listed below:

  - the agglomeration force of the grains is limited to a predetermined value corresponding to the average force applicable by new pressure; - the agent comprises one or more natural waxes; - the pulverulent material comprises a mixture of mica and titanium oxide; the grains forming the peripheral surface have a different color from other grains - the grains forming the peripheral surface have a smaller particle size

than the others.

  The invention also relates to a use of a cosmetic product for the

  manufacturing of a make-up product.

  The powders used to make these pearls have powders of various colors (with pigments) having a very fine particle size of 5 to 25 μm. This particle size makes it very difficult to use drageification turbines because the powder flies in the turbine and the manufacturing room. It is therefore important at first, to carry out a "pre-granulation" (massive impregnation with the binding agent in a turbine or wet mixer) making it possible to obtain granulometry grains.

larger by about 100, um.

  Once this pre-granulation is done we can split the powder

impregnated in two parts.

  Part of the previous powder is put back in a turbine, the other part is

  gradually added to the previous one after spraying the binder solution.

  The interest is as follows: the 100 m grains coming from the pre-granulation are covered with grains of the same size or from a granulation faster than with particles from 5 to 25 gm in diameter and a gain in productivity. The granulation operations are repeated on average three times after these granulation cycles, where sieving is carried out. Small wind pearls taken up in a turbine

  to be re-granulated according to the previously described process.

  These granulation operations are continued until all

  fines reach the upper particle size.

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  We proceed in the same way, con for the particle sizes of 400, 700, 1000, 2000, um by successive accumulation of layers of granulometry powder

  average of 100 µm and binder solution.

  A preferred embodiment of the invention is described below for the constitution of a cosmetic product in the form of eyeshadow pearls having an appropriate particle size and which can be colored and perfumed, intended for

  make-up of the cheeks and eyelids.

  According to this example, we start with a fine pigmented powder based on mica and

  of titanium oxide although this mixture is not limitative of the invention.

  o Indeed, any other fine powder that can spread on the skin can be used.

  In addition, a binding agent is preferably used consisting of a mixture of natural waxes in an organic solution (advantageously a solution

  95% alcohol in which the coating agent is diluted to 40%).

  The method according to the invention is covered by means of the steps

following.

  First, we carry out the impregnation of the pulverulent matter

  (eg mica powder and titanium oxide) with the binding agent.

  This impregnation is carried out in a turbine or in a powder mixer and has the effect of greatly increasing the particle size of the pulverulent material, which

  o makes it faster to obtain the desired size for the product.

  The grains are thus dried either by simple evaporation or by additional drying means, for example at a temperature of 40 ° C.

for two hours.

  However, in the context of the use of a coating agent in alcoholic solution, evaporation occurs rapidly which has the advantage of not

  systematically require additional drying means.

  We then carry out a series of granulometry whose number is a function of

  the desired size for the grains of the cosmetic product.

  For each particle size, a certain quantity is placed in a turbine.

  o impregnated pulverulent matter.

  The agent intended to bind the grains is then sprayed.

  When the mass of pulverulent material becomes moist and sticky, pulverulent impregnated pulp is added so that it comes to settle.

around the grains already formed.

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s

  This forms an agglomeration of the grains added around the former.

  These steps are repeated several times depending on the application.

  desired and the desired particle size.

  It is then dried in the turbine for example for a duration of 5 min a

s 40 C.

  The manufacturing method of the invention may also include a sieving step consisting in using a sieve of the desired dimensions for the pearls and to make the pearls lower than at a given level in order to reproduce the steps.

granulation.

  o As a preference, the dilution of the binding agent is increased as the granulation stages progress, in order to avoid the different agglomerations of grains

don't stick together.

  For example, the coating agent may be diluted up to 10% in a

95% alcoholic solution.

  s As a preference, the last granulation step is carried out with grains of a different color in order to form an outer peripheral layer

  different in pigmentation from the cosmetic product.

  In this way, con, during the decohesion of the product in particular by crushing on the skin, we discover a product of different color to its initial external appearance. As indicated above, the cosmetic product according to the invention offers a compromise between the cohesion necessary for storage, packaging and application of the product while at the same time allowing crushing and decomposition of the

agglomerate such as factories.

  This crushing ensures the final realization of a cosmetic layer of small particle size. The cohesive force produced by the agglomeration of the grains during the granulation phases will be adapted as a function of the desired minimum crushing force.

  when prompted by the user.

  n / a A particle agglomeration force will be chosen which is less than the force capable of being applied by the user, in particular by means of a makeup brush. As an indication, the manual pressure exerted by a user on a brush

  make-up corresponds to an effort of between 0.05 and 0.3 Newtons.

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  In this way, the cosmetic product can easily be crushed and its

agglomerate structure removed.

  According to a variant, the final granulation phases are carried out with non-impregnated pulverulent material to obtain a surface layer of greater finesse and increased regularity. In addition, this layer presents more vivid colors because the

  pigmentation is not attenuated by the presence of the binding agent.

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Claims (15)

  1. Method for manufacturing a cosmetic product, characterized in that it comprises the following granulation steps: s - impregnation of a pulverulent material with a binding agent to form grains, - drying of the grains, - spraying of '' a binding agent on the grains, agglomeration of other grains around the pulverized grains, o - drying of the product obtained.   2. Method according to claim 1, characterized in that one uses a binding agent comprising one or more natural waxes in an alcoholic solution.   3. Method according to claim 1 or 2 characterized in that if the product obtained is sieved, the spraying, agglomeration and drying steps are repeated   until the desired size for the cosmetic product is obtained.   4. Method according to claim 3 in combination with claim 2 characterized in that the dilution of the binding agent is increased as the granulation steps progress.   5. Method according to any one of claims 3 or 4 characterized by   the fact that we carry out the last agglomeration steps with a material pulverulent of different color.   6. Method according to any one of claims 1 to 5, characterized by the fact   that the granulation steps are carried out in a turbine.   7. Method according to any one of claims 1 to 6, characterized by the   makes a finish covering with a non-impregnated powdery material.   8. Method according to any one of claims 1 to 7, characterized by the fact 28411 55   that the binding agent is chosen to limit the agglomeration force of the grains to a predetermined value correspond to the average force applicable by new pressure. 9. Cosmetic product characterized by the fact that it is composed of a plurality of grains based on a pulverulent material,   said grains being agglomerated by a binding agent.   10. Product according to claim 9 characterized in that the agglomeration force of the grains is limited to a predetermined value   correspond to the average force applicable by new pressure.   o 11. Product according to claim 9 or 10 characterized in that   the binding agent comprises one or more natural waxes.   12. Product according to any one of claims 9 to 11, characterized by   the fact that the pulverulent material comprises a mixture of mica and titanium oxide.   13. Product according to any one of claims 9 to 12, characterized by   the fact that the grains forming the peripheral surface have a color different from other grains.   o 14. Product according to any one of claims 9 to 13, characterized by   the fact that the grains forming the peripheral surface are weaker particle size than the others.   15. Use of the cosmetic product according to any one of