WO2010143314A1

WO2010143314A1 - Cosmetic and preparation process thereof

Info

Publication number: WO2010143314A1
Application number: PCT/JP2009/061143
Authority: WO
Inventors: Ryusei Nonaka; Anke Hadasch
Original assignee: L'oreal
Priority date: 2009-06-12
Filing date: 2009-06-12
Publication date: 2010-12-16
Also published as: CN102802591A; JP2012529424A

Abstract

The present invention relates to a powdery cosmetic composition in the form of compacter powder, comprising a pulverulent phase comprising (a) 45% by weight or more relative to the total weight of the composition of at least one filler selected from the group consisting of a filler having an aspect ratio of 10 or more, silica microspheres, microporous polymer microspheres, polyurethane powder, polymer microcapsules, elastomeric crosslinked organopolysiloxane powders; (b) at least one non- magnetic pigment; and (c) optionally at least one magnetic particle, wherein the ratio of the non-magnetic pigment (s) /the magnetic particle (s) when the magnetic particle (s) is/are present in the cosmetic composition is 1 or more, as well as the method for preparing the cosmetic, and the like. The present invention can prevent a flow pattern or patterns which may be found on a conventional cosmetic including a substantial amount of a magnetic particles prepared by a wet process. Further, the present invention can prevent the paler surface color of a cosmetic prepared by a wet process as compared to the surface color of a cosmetic prepared by a dry process.

Description

DESCRIPTION

COSMETIC AND PREPARATION PROCESS THEREOF

TECHNICAL FIELD

The present invention relates to a powdery cosmetic composition, in particular a compacted powder cosmetic composition, and a method for preparing a cosmetic, and the like.

BACKGROUND ART

The methods to make a powdery cosmetic such as a powdery foundation may be classified into two types, i.e., dry process and wet process.

In the dry process, the components, which are mostly powders, of a powdery cosmetic are filled into a container such as a pan. After the filling, they are pressed by mechanical force provided by an electric motor, a hydraulic ram or a pneumatic cylinder, etc., in order to compact the components to prepare the powdery cosmetic. Supersonic waves may be added, if necessary, to the components as described in JP-A-H05-70325.

In the wet process, on the other hand, the components of a powdery cosmetic are dispersed once in a large amount of a solvent to make a slurry. Then, the slurry is filled into a container. After the filling, the slurry is pressed by mechanical force while the solvent is removed simultaneously and/or sequentially in order to solidify the slurry.

Generally, the wet process is more complicated than the dry- process, and therefore the production cost tends to be higher. However, the wet process sometimes enables the use of special formulations (e.g., those including a high amount of spherical powders) or brings special properties (e.g., smooth texture and good drop resistance) which may not be achieved with the dry process. Accordingly, the use of the wet process is increasing recently, in order to provide new cosmetics which may be differentiated from conventional cosmetic products. DISCLOSURE OF INVENTION

However, some issues which do not occur in the dry process happen in the wet process. These issues may make it difficult to use the wet process for preparing a cosmetic, in particular a powdery- cosmetic composition.

The above issues are as follows:

(1) a flow pattern or patterns found on the surface of a cosmetic prepared by the wet process;

(2) paler color of the surface of a cosmetic prepared by the wet process as compared to the color of the surface of a cosmetic prepared by the dry process; and

(3) paler color of the surface of a cosmetic prepared by the wet process as compared to the color in the cosmetic.

Thus, an objective of the present invention is to prevent a flow pattern or patterns which may be found on a cosmetic prepared by the wet process.

Another objective of the present invention is to prevent paler surface color of a cosmetic prepared by the wet process as compared to the surface color of a cosmetic prepared by the dry process .

A further objective of the present invention is to prevent paler surface color of a cosmetic prepared by the wet process as compared to the color in the cosmetic.

The above objectives of the present invention can be achieved by a powdery cosmetic composition in the form of compacted powder comprising a pulverulent phase comprising:

(a) 45% by weight or more relative to the total weight of the composition of at least one filler selected from the group consisting of a filler having an aspect ratio of 10 or more, silica microspheres, microporous polymer microspheres, polyurethane powder, polymer microcapsules, elastomeric crosslinked organopolysiloxane powders;

(b) at least one non-magnetic pigment; and (c) optionally at least one magnetic particle, wherein the ratio of the non-magnetic pigment (s) /the magnetic particle (s) when the magnetic particle (s) is/are present in the powdery cosmetic composition is 1 or more.

In a preferred embodiment, this powdery cosmetic composition is obtained by a wet process.

The filler is preferably selected from natural mica, synthetic mica, sericite, elastomeric crosslinked organopolysiloxane powders, and mixture thereof.

The magnetic particle (s) may comprise black iron oxide.

It is preferable that the non-magnetic pigment (s) comprise (s) a composite pigment comprising an inorganic core which is at least partially coated with at least one organic or inorganic coloring substance. The composite pigment may preferably comprise at least one binder for fixing the organic or inorganic coloring substance on the inorganic core.

The total amount of the non-magnetic pigment and the magnetic particle, if present, may be from 0.1 to 25% by weight relative to the total weight of the powdery cosmetic composition.

The total amount of the pulverulent phase may be from 80 to 95% by weight relative to the total weight of the powdery cosmetic composition.

The amount of the filler in the powdery cosmetic composition may be 60% by weight or more, preferably 70% by weight or more, relative to the total weight of the powdery cosmetic composition.

The ratio of the non-magnetic pigment (s) /the magnetic particle (s) in the powdery cosmetic composition is preferably 20 or more, and more preferably 50 or more.

Another aspect of the present invention is a method for preparing a cosmetic comprising the steps of: dispersing at least a powder comprising at least one non-magnetic pigment in a liquid to obtain a slurry; shaping the slurry in a container by compression or aspiration; and drying the shaped slurry, characterized in that the powder comprises no magnetic particle (s), or when the powder comprises magnetic particle (s), the quantity of the magnetic particle (s) is such that the ratio of the nonmagnetic pigment ( s) /the magnetic particle (s) in the cosmetic is 1 or more.

In the above method, it is preferable that at least a part of the liquid is removed in the shaping step.

It is also preferable that the powder comprises no magnetic particle (s). The magnetic particle (s) may comprise black iron oxide .

It is preferable that the non-magnetic pigment (s) comprise (s) a composite pigment as defined above. The composite pigment may preferably comprise at least one binder for fixing the organic or inorganic coloring substance on the inorganic core.

The total amount of the non-magnetic pigment (s) and the magnetic particle (s), if present, may be from 0.1 to 25% by weight relative to the total weight of the cosmetic.

The total amount of the powder may be from 80 to 95% by weight relative to the total weight of the cosmetic.

The present invention also relates to a cosmetic obtainable by the method as defined above, which is exemplified by a cosmetic comprising the powdery cosmetic composition as defined above.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shows two photographs of the powdery cosmetic compositions according to Example 1 and Comparative Example 1. Fig. 2 shows a graph showing the change in the surface color of the powdery cosmetic compositions according to Example 1 and Comparative Example 1 up to 100 times of a pick up of a part of the powdery cosmetic compositions from the surface thereof.

Fig. 3 shows photographs of the powdery cosmetic compositions according to Example 1 and Comparative Example 1 showing the influence of magnetism.

BEST MODE FOR CARRYING OUT OF THE INVENTION

The present inventors have found that the origin of the above- described flow pattern or patterns and paler color of a cosmetic obtained by a wet process is a magnetic particle or particles, typically magnetic pigment (s), contained in the cosmetic.

The machine and the like used for the preparation of cosmetics may have magnetism due to mechanical stress and the like applied to the machine or the like during preparation operations thereof.

The magnetism affects a magnetic particle or particles contained in the cosmetic to cause aggregation of the magnetic particle (s) which results in a flow pattern or patterns and paler surface color of the cosmetic. This problem is possible in a wet process because the magnetic particle (s) can move in a liquid medium essentially used in the wet process, while the magnetic particle (s) cannot move in a dry process using no liquid medium, and therefore, the magnetic particle (s) cannot cause this problem in a dry process. Thus, it should be noted that the above problem is specific to a wet process.

(Powdery Cosmetic Composition)

According to the present invention, in order to solve the above problem, a powdery cosmetic composition according to the present invention to be obtained by a wet-process comprises no magnetic particle or a relatively small amount of a magnetic particle or particles . First, the powdery cosmetic composition according to the present invention will be explained below in more detail.

(Pulverulent Phase)

The powdery cosmetic composition according to the present invention comprises a pulverulent phase, as a main component. The total amount of the pulverulent phase, may be from 70 to 100% by weight, preferably 80 to 95% by weight, more preferably 85 to 95% by weight relative to the total weight of the powdery cosmetic composition. The amount of the pulverulent phase is calculated based on only the powder therein, and the amount of another component such as a trace amount of a solvent which may be present therein is not taken into consideration for the calculation.

The pulverulent phase comprises at least one specific filler and at least one non-magnetic pigment, as essential components, and may comprise at least one magnetic particle, as an optional component .

These may have been, if necessary, subjected to surface treatments with a hydrophobic agent. The hydrophobic agent can be chosen from silicones such as methicones, dimethicones, perfluoroalkyl- silanes; fatty acids such as stearic acid; metallic soaps such as aluminum dimyristate, aluminum salt of glutamate of hydrogenated tallow, perfluoroalkyl phosphates, perfluoroalkyl-silanes, perfluoroalkylsilazanes, polyoxides of hexafluoropropylene, polyorganosiloxanes comprising perfluoroalkyl perfluoropolyether groups; aminated acids; N-acyl aminated acids or their salts; lecithin, isopropyl trisostearyl titanate; esters such as isostearyl sebacate; surfactants such as disodium stearoyl glutamate; and their mixtures.

The N-acyl aminated acids can comprise an acyl group having from 8 to 22 carbon atoms, such as, for example, a 2-ethylhexanoyl, caproyl, lauroyl, myristoyl, palmitoyl, stearoyl or cocoyl group. The salts of these compounds can be aluminum, magnesium, calcium, zirconium, zinc, sodium or potassium salts. The aminated acid can be, for example, lysine, glutamic acid or alanine, and their derivatives . The term alkyl mentioned in the compounds mentioned previously especially designates an alkyl group having from 1 to 30 carbon atoms, preferably having from 5 to 16 carbon atoms. Treated hydrophobic pigments are especially described in the application EP-A-1086683. ^

According to a preferred mode of realization, the pigments can be coated with N-acyl-aminated acids such as lauroyl lysine, surfactants such as disodium stearyl glutamate; and silicones such as dimethicone; and esters such as isostearyl sebacate.

(Specific Filler)

The powdery cosmetic composition according to the present invention comprises at least one specific filler.

In one embodiment, as the specific filler, a filler having a high aspect ratio of 10 or more is used. The aspect ratio may be 20 or more or 50 or more. The aspect ratio can be determined by the average thickness and the average length according to the formula: aspect ratio = length/thickness.

In particular, such a filler having an aspect ratio of 10 or more may be chosen from natural mica, synthetic mica, sericite and mixtures thereof.

In another embodiment, as the specific filler, an incompactable filler (a filler known as being incompactable) is used.

The term "incompactable filler, " as used herein, means a powder which, at and above a certain amount that will depend on the material under consideration, for example, from an amount of greater than or equal to 5% by weight relative to the total weight of the composition, does not have good compactability using a manual press, for example, under a pressure of 2*10⁷Pa (200 bar) and/or is detrimental to the production of products with good impact strength, for example, having a loss of mass of greater than 12% in the drop test, and/or that does not make it possible to obtain a compact product that can be eroded homogeneously. The at least one incompactable filler may be organic or mineral, and in spherical or flake or lamellar form.

Such incompactable fillers may be chosen, for example, from silica microspheres, for example of open porosity, such as hollow silica microspheres, including the products "Silica Beads SP 700/HA(R)" and "Silica Beads SB 700(R)" from the company Maprecos, and "Sunspheres H-33 (R) " and "Sunspheres H- 51(R)" from the company Asahi Glass; these microspheres may, where appropriate, be impregnated with a cosmetic active agent; microporous polymer microspheres, which have a structure similar to that of a sponge; they generally have a specific surface area of at least 0.5 m²μg, for example, of at least 1 mVg, the specific surface area having no upper limit other than that resulting from the practical possibility of making microspheres of very high porosity: the specific surface area may be, for example, up to 1000 m²/g or even more. Examples of these microspheres include acrylic polymer microspheres, such as those made of crosslinked acrylate copolymer "Polytrap 6603 Adsorber®" from¹ the company RP Scherrer, and those made of polymethyl methacrylate "Micropearl M 100®" from the company SEPPIC; polyurethane powder, such as the powdered copolymer of hexamethylene diisocyanate and of trimethylolhexyl lactone sold under the name "Plastic Powder D-400® " by the company Toshiki; polymer microcapsules having only one closed cavity and forming a reservoir, which may contain a liquid, for example, a cosmetic active agent; these polymer microcapsules are prepared via known processes, such, as those described in patents U.S. Pat. No. 3,615,972 and EP 56,219 A. They may be made, for example, of polymers or copolymers of ethylenically unsaturated acid, amine or ester monomers, of urea- formaldehyde polymers or of vinylidene chloride polymers or copolymers; for example, microcapsules made of methyl acrylate or methacrylate polymers or copolymers, and alternatively of copolymers of vinylidene chloride and of acrylonitrile, for example, "Expancel® " from the company Expancel. These polymers include, for example, those having from 20 to 60% by weight of units derived from vinylidene chloride, from 20 to 60% by weight of units derived from acrylonitrile and from 0 to 40% by weight of other units such as units derived from an acrylic and/or styrene monomer; crosslinked acrylic polymers and copolymers may also be used; elastomeric crosslinked organopolysiloxane powders, described for example, in document JP 2,243,612 A, such as those sold under the name "Trefil Powder E-506C" by the company Dow Corning, elastomeric crosslinked organopolysiloxane powders coated with silicone resin, such as silsesquioxane resin, as described, for example, in patent U.S. Pat. No. 5,538,793. Such elastomers are sold under the names "KSP-100", "KSP-101", "KSP-102", "KSP-103", "KSP-104" and "KSP-105" by the company Shin-Etsu, and mixtures thereof; and mixtures thereof.

In a preferred embodiment, the above specific filler is selected from elastomeric crosslinked organopolysiloxane powders; natural mica; synthetic mica; sericite; and mixtures thereof.

A single type of filler or a combination of two or more types of fillers may be used.

A relatively large amount of the above filler or fillers are difficult to be compacted in a dry process, and therefore, a powdery cosmetic composition comprising a pulverulent phase comprising 45% by weight or more of the incompactable filler or fillers having an high aspect ratio of 10 or more are preferably prepared by a wet-process. Thus, the powdery cosmetic composition according to the present invention comprises the above specific filler or fillers in an amount of 45% by weight or more, preferably 50% by weight or more, more preferably 55% by weight or more, more preferably 60% by weight or more, and more preferably 70% by weight or more, relative to the total weight of the composition. (Non-Magnetic Pigment)

The powdery cosmetic composition according to the present invention comprises at least one non-magnetic pigment. The term ^λnon-magnetic pigment' means pigments which do not present magnetic susceptibility, i.e., pigments that are not sensitive to the action of a magnetic field, and that do not tend to come into alignment with the field lines, for example. As long as the nonmagnetic pigment shows no magnetism, the material or type of the non-magnetic pigment is not limited.

As the non-magnetic pigment, a non-magnetic pigment which is not soluble in a liquid is preferably used, because it does not dissolve into the liquid medium used for a wet-process. Therefore, it remains in the powdery cosmetic composition, and makes it easy to control the color of the powdery cosmetic composition.

Thus, as the non-magnetic pigment, an insoluble organic nonmagnetic pigment and an insoluble inorganic non-magnetic pigment are preferable, and an insoluble inorganic non-magnetic pigment is more preferable.

As the insoluble non-magnetic organic pigment, Red 201, Orange 203, Yellow 4, and the like, which have been surface-treated to be insoluble may be used.

As the insoluble inorganic non-magnetic pigment, mention may be made of red iron oxide, yellow iron oxide, zinc oxide," titanium dioxide, Ultramarine and Prussian blue. Red iron oxide, yellow iron oxide, zinc oxide, titanium dioxide, or Prussian blue may be preferable .

A non-magnetic pearlescent pigment may also be used as the insoluble inorganic non-magnetic pigment. As the non-magnetic pearlescent pigment, mention may be made of bismuth oxychloride, mica coated with titanium dioxide, and mica coated with aluminum hydroxide .

In the present specification, titanium oxide fine particles with less than 1 μm diameter, is also categorized as the insoluble inorganic non-magnetic pigment. Titanium oxide with less than 1 μm diameter may be used as a white inorganic non-magnetic pigment.

One of the most preferable examples of the non-magnetic pigment is a composite pigment comprising an inorganic core which is at least partially coated with at least one organic or inorganic coloring substance. It is preferable that the composite pigment comprises at least one binder for fixing the organic or inorganic coloring substance on the inorganic core.

The composite pigments may have, for example, a BET specific surface area ranging from 0.5 and 500 m²/g, such as from 1.5 to 400 m²/g, or from 2 to 300 m²/g. The "BET specific surface area" is the value measured by the BET (Brunauer-Emmaett-Telles ) method.

The inorganic core may have any form that is suitable for fixing particles of organic or inorganic coloring substances, wherein non-limiting examples include spherical, globular, granular, polyhedral, acicular, spindle-shaped, flattened in the form of a flake, a rice grain, or a scale, and a combination of these forms.

In one embodiment, the ratio of the largest dimension of the core to its smallest dimension is in the range 1 to 50.

The inorganic core may have a mean size ranging from 1 nm (nanometer) to 100 nm, such as in the range from 5 nm to 75 nm, or in the range from 10 nm to 50 nm. In one embodiment, the inorganic core may have a mean size ranging from 15 nm to 40 nm, such as, for example, 20 nm or 25 nm.

The term "mean size" means the dimension given by the statistical grain size distribution curve at 50% population, termed D50. The mean size may be a number average determined by image analysis (electron microscopy) .

The inorganic core may present a refractive index not less than 2, better not less than 2.1, for example not less than 2.2.

Among materials that form the inorganic core, non-limiting mention may be made of metallic salts and metal oxides, such as oxides of titanium, zirconium, cerium, zinc, iron, iron blue, aluminum, and chromium, aluminas, glasses, ceramics, graphite, silicas, silicates, including aluminosilicates and borosilicates, synthetic mica, and mixtures thereof.

In one embodiment, the inorganic core may be formed from oxides of titanium, such as TiO₂, iron, such as Fe₂O₃, cerium, zinc, and aluminum; silicas; and silicates, such as aluminosilicates and borosilicates .

The inorganic core may have a specific surface area, measured using the BET method, in the range from about 1 m²/g to about 1000 m²/g, such as in the range from about 10 m²/g to about 600 Va²Zg₁ or in the range from about 20 m²/g to about 400 m²/g. In one embodiment, the inorganic core may have a specific surface area ranging from 25 m²/g to 75 m²/g. In another embodiment, the inorganic core may have a specific surface area ranging from 40 m²/g to 60 m²/g, such as, for example, 50 m²/g.

The inorganic core may be colored if appropriate.

The mass proportion of the core in the composite pigment may exceed 50% relative to the total weight of the composite pigment. For example, the core may be present in the composite pigment in an amount ranging from 50% to 70% by weight relative to the total weight of the composite pigment, such as from 60 to 70% by weight relative to the total weight of the composite pigment.

The binder when present may be of any type provided that it allows the organic or inorganic coloring substance to adhere to the surface of the inorganic core. The binder may be organic.

The binder may be chosen from non-limiting examples including silicone compounds, such as silicone polymers, polymeric or oligomeric compounds or the like, and from organosilanes, fluoroalkyl organosilanes and polysiloxanes, and also various couplers, such as couplers based on silanes, on titanates, on aluminates or on zirconates, and mixtures thereof.

In one embodiment, the silicone compound may be chosen from: the organosilanes (1) obtained from alkoxysilanes, the modified or unmodified polysiloxanes (2) chosen from a non-limiting list comprising: the modified polysiloxanes (2A) comprising at least one radical chosen especially from polyethers, polyesters and epoxy compounds (these will be referred to as "modified polysiloxanes") , the polysiloxanes (2B) bearing, on a silicon atom located at the end of the polymer, at least one group chosen from a non- limiting list comprising carboxylic acids, alcohols and hydroxyl groups, and the fluoroalkyl organosilane compounds (3) obtained from fluoroalkylsilanes .

The organosilane compounds (1) may be obtained from alkoxysilane compounds of formula (I):

R^SiX^a (I)

wherein:

R¹ i s chosen from CeH₅- , ( CHs ) ₂CHCH₂- and n-C_bH2_b+i- ( wherein b ranges from 1 to 18),

X is chosen from CH₃O- and C₂H₅O-, and a ranges from 0 to 3.

Non-limiting examples of alkoxysilane compounds may include alkoxysilanes chosen from: methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethyoxysilane, diphenyldiethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, isobutyltrimethoxysilane, decyltrimethoxysilane and the like. In one embodiment, the alkoxysilane compounds may be chosen from methyltriethoxysilane, phenyltriethyoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane and isobutyltrimethoxysilane. In a further embodiment, the alkoxysilane compounds may be chose from methyltriethoxysilane, methyltrimethoxysilane and phenyltriethyoxysilane . The polysiloxanes (2) may be chosen from compounds of formula (ID:

wherein

R ,2 is chosen from H- and CH₃- and d ranges from 15 to 450.

In one embodiment, R comprises H.

The modified polysiloxanes (2A) may be chosen from the following formulae :

(a¹) modified polysiloxanes bearing polyethers, chosen from compounds of formula (III)

wherein

- R³ comprises -(CH₂)_h~;

- R⁴ comprises -(CH₂)_!- CH₃;

- R⁵ is chosen from -OH, -COOH, -CH=CH₂, -C(CH₃)=CH₂ and - (CH₂) _:- CH₃;

- R⁶ comprises - (CH₂) _k~CH₃;

- g and h independently range from 1 to 15;

- j and k independently range from 0 to 15;

- e ranges from 1 to 50; and

- f ranges from 1 to 300;

(a²) modified polysiloxanes bearing polyesters, chosen from compounds of formula (IV):

wherein

- R⁷, R⁸ and R⁹ are independently chosen from - (CH₂) _q-;

- R¹⁰ is chosen from -OH, -COOH, -CH=CH₂, -C(CH₃)=CH₂ and - (CH₂)r- CH₃;

- R¹¹ comprises - (CH₂) _s- CH₃ ;

- n and q independently range from 1 to 15;

- r and s independently range from 0 to 15;

- e ranges from 1 to 50; and

- f ranges from 1 to 300;

(a³) modified polysiloxanes bearing epoxy radicals, chosen from compounds of formula (V) :

wherein

- R¹² comprises -(CH₂)V-;

- v ranges from 1 to 15;

- t ranges from 1 to 50; and

- u ranges from 1 to 300; and

- mixtures thereof.

In one embodiment, the modified polysiloxanes (2A) comprise modified polysiloxanes bearing polyethers of formula (III). The polysiloxanes modified on the end portion (2B) may be chosen from compounds of formula (VI) :

wherein

R¹³ and R¹⁴ are independently chosen from -OH, R¹⁶OH and R¹⁷COOH;

R¹⁵ is chosen from -CH₃ and -CβH₅;

R¹⁶ and R¹⁷ comprise - ( CH₂ ) _y- ; y ranges from 1 to 15; w ranges from 1 to 200; and x ranges from 0 to 100.

In one embodiment, the polysiloxanes modified on at least one end, comprise polysiloxanes bearing at least radical R¹⁶ and/or R¹⁷ bearing a carboxylic acid group on at least one terminal silicon atom.

The fluoroalkyl organosilane compounds (3) may be obtained from fluoroalkyl silanes of formula (VII):

CF₃ (CF₂) _ZCH₂CH₂ (R¹⁸) _aSiX₄-a (VII )

wherein:

R¹⁸ is chosen from CH₃-, C₂H₅-, CH₃O- and C₂H₅O-; X is chosen from CH₃O- and C₂H₅O-; z ranges from 0 to 15; and a ranges from 0 to 3.

The fluoroalkyl silanes may be chosen from non-limiting examples including trifluoropropyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, heptadecafluorodecylmethyldimethoxysilane, trifluoropropyltriethoxysilane, tridecafluorooctyItriethoxysilane, heptadecafluorodecyltriethoxysilane, heptadecafluorodecylmethyldiethoxysilane and the like. In one embodiment, the fluoroalkyl silanes are chosen from trifluoropropyltrimethoxysilane, tridecafluorooctyltrimethoxysilane and heptadecafluoro- decyltrimethoxysilane . In a further embodiment, the fluoroalkyl silanes are chosen from trifluoropropyltrimethoxysilane and tridecafluorooctyltrimethoxysilane.

The silane-based couplers may be chosen from non-limiting examples including vinyltrimethoxysilane, vinyltriethoxysilane, γ~ aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ~ mercaptopropyltrimethoxysilane, γ-methacryloxy- propyltrimethoxysilane, N-β- (aminoethyl) -γ~ aminopropyltrimethoxysilane, γ-glycidoxy- propylmethyldimethoxysilane and γ-chloropropyltrimethoxysilane, and the like.

The titanate-based couplers may be chosen from isopropylstearoyl titanate, isopropyltris (dioctyl pyrophosphate) titanate, isopropyltris (N-aminoethylaminoethyl) titanate, tetraoctylbis (ditridecyl phosphate) titanate, tetrakis (2, 2- diaryloxymethyl-1-butyl) bis (ditridecyl) phosphate titanate, bis (dioctyl pyrophosphate) oxyacetate titanate and bis (dioctyl pyrophosphate) ethylene titanate, and the like.

The aluminate-based couplers may be chosen from acetoalkoxyaluminium diisopropoxide, aluminium diisopropoxymonoethylacetoacetate, aluminium trisethylacetoacetate and aluminium trisacetylacetonate, and the like.

The zirconate-based couplers may be chosen from zirconium tetrakisacetylacetonate, zirconium dibutoxybisacetylacetonate, zirconium tetrakisethylacetoacetate, zirconium tributoxymonoethylacetoacetate and zirconium tributoxyacetylacetonate, and the like.

The compounds used as the binder may have a molecular mass ranging from 300 to 100, 000. In order to obtain a coat that covers the inorganic cores uniformly, the binder may be in a form that is liquid or soluble in water or in various solvents.

The amount of binder may range from 0.01 to 15%, such as from 0.02% to 12.5% or 0.03 to 10% by weight (calculated relative to C or Si) rela^'tive to the weight of the particles comprising the core and the binder. For further details regarding the way of calculating the relative amount of the binder, reference may be made to European Patent Application No. EP 1 184 426 A2.

In one embodiment, the amount of the binder present in the composition may not exceed 5%, or for example 3%, by weight of the total weight of the composite pigment.

The organic or inorganic coloring substance may, for example, be selected from particular compounds that are insoluble in the liquid medium used for a wet-process used for preparing the powdery cosmetic composition according to the present invention.

The inorganic coloring substance may, for example, comprise inorganic pigments such as carbon black.

The organic coloring substance may, for example, comprise pigments, for example organic lakes or other pigments, which may be selected from the following compounds and mixtures thereof: cochineal carmine; the organic coloring substances of azo, anthraquinone, indigo, xanthene, pyrene, quinoline, triphenylmethane, or fluorane dyes; and

- organic lakes or insoluble salts of sodium, potassium, calcium, barium, aluminum, zirconium, strontium, titanium, or of acid dyes such as azo, anthraquinone, indigo, xanthene, pyrene, quinoline, triphenylmethane, or fluorine dyes, which dyes may comprise at least one carboxylic or sulfonic acid group.

Among organic coloring substances ^"that may be used in the powdery cosmetic composition according to the present invention, non- limiting mention may be made of D&C Blue No.4, D&C Brown No.l, D&C Green No.5, D&C Green No.6, D&C Orange No.4, D&C Orange No.5, D&C Orange No.10, D&C Orange No.11, D&C Red No.6, D&C Red No.7, D&C Red No.17, D&C Red No.21, D&C Red No.22, D&C Red No.27, D&C Red No.28, D&C Red No.30, D&C Red No.31, D&C Red No.33, D&C Red No.34, D&C Red No.36, D&C Violet No.2, D&C Yellow No.7, D&C Yellow No.8, D&C Yellow No.10, D&C Yellow No.11, FD&C Blue No.l, FD&C Green No.3, FD&C Red No.40, FD&C Yellow No.5, and FD&C Yellow No .6.

The organic coloring substance may comprise an organic lake supported by an organic support such as colophane or aluminum benzoate, for example.

Among organic lakes that may be used in the composition according to the present invention, non-limiting mention may be made of D&C Red No.2 Aluminum lake, D&C Red No.3 Aluminum lake, D&C Red No.4 Aluminum lake, D&C Red No.6 Aluminum lake, D&C Red No.6 Barium lake, D&C Red No.6 Barium/Strontium lake, D&C Red No.6 Strontium lake, D&C Red No.6 Potassium lake, D&C Red No.7 Aluminum lake, D&C Red No.7 Barium lake, D&C Red No.7 Calcium lake, D&C Red No.7 Calcium/Strontium lake, D&C Red No.7 Zirconium lake, D&C Red No.8 Sodium lake, D&C Red No.9 Aluminum lake, D&C Red No .9 Barium lake, D&C Red No.9 Barium/Strontium lake, D&C Red No.9 Zirconium lake, D&C Red No.10 Sodium lake, D&C Red No.19 Aluminum lake, D&C Red No.19 Barium lake, D&C Red No.19 Zirconium lake, D&C Red No.21 Aluminum lake, D&C Red No.21 Zirconium lake, D&C Red No.22 Aluminum lake, D&C Red No.27 Aluminum lake, D&C Red No.27 Aluminum/Titanium/Zirconium lake, D&C Red No.27 Barium lake, D&C Red No.27 Calcium lake, D&C Red No.27 Zirconium lake, D&C Red No.28 Aluminum lake, D&C Red No.30 lake, D&C Red No.31 Calcium lake, D&C Red No.33 Aluminum lake, D&C Red No.34 Calcium lake, D&C Red No.36 lake, D&C Red No.40 Aluminum lake, D&C Blue No.l Aluminum lake, D&C Green No .3 Aluminum lake, D&C Orange No .4 Aluminum lake, D&C Orange No.5 Aluminum lake, D&C Orange No.5 Zirconium lake, D&C Orange No.10 Aluminum lake, D&C Orange No.17 Barium lake, D&C Yellow No .5 Aluminum lake, D&C Yellow No .5 Zirconium lake, D&C Yellow No.6 Aluminum lake, D&C Yellow No.7 Zirconium lake, D&C Yellow No.10 Aluminum lake, FD&C Blue No.l Aluminum lake, FD&C Red No.4 Aluminum lake, FD&C Red No.40 Aluminum lake, FD&C Yellow No .5 Aluminum lake, and FD&C Yellow No.6 Aluminum lake. The chemical compounds corresponding to each of the organic coloring substances listed above are mentioned in the work entitled "International Cosmetic Ingredient Dictionary and Handbook ", 1997 edition, pages 371 to 386 and 524 to 528, published by "The Cosmetic, Toiletry, and Fragrance Association", the contents of which are hereby incorporated by reference.

The organic or inorganic coloring substance may be present in the composition in an amount ranging from 10 parts to 500 parts by weight per 100 parts of inorganic core. In other embodiments of the present disclosure, the organic or inorganic coloring substance may be present in the composition in an amount ranging from 20 parts to 250 parts by weight or from 40 parts to 125 parts by weight per 100 parts of inorganic core.

The proportion of the organic or inorganic coloring substance in the composite pigment may exceed 30% relative to the total weight of the composite pigment. In one embodiment, the organic or inorganic coloring substance may be present in the composite pigment in an amount ranging from 30% to 50% by weight, such as from 30% to 40% by weight.

The composite pigment may be manufactured by any appropriate method, for example a mechano-chemical method or a method of precipitation in solution, with dissolution of an organic coloring substance and precipitation thereof at the surface of the core.

binder may or may not be used.

A method comprising mechanical mixing of the organic or inorganic coloring substance and the core is preferred. A binder may be added and mixed with the core before the introduction of the organic coloring substance.

The composite pigment may, for example, be produced using one of the processes described in European Patent Applications EP 1 184 426 and EP 1 217 046, the contents of which are hereby incorporated by reference. In one embodiment, the process described in EP 1 184 426 is used to produce the composite pigment In one implementation, the particles intended to constitute the inorganic core are first mixed with the binder.

So that the binder can adhere uniformly to the surface of the inorganic core, it is preferable to pass said particles initially through a mill to disaggregate them.

The mixing and agitation conditions can be selected so that the core is uniformly coated with binder. Such conditions may be controlled so that the linear load is in the range 19.6 N/cm (newtons/centimeter) to 19,160 N/cm, such as in the range 98 N/cm to 14,170 N/cm or 147 N/cm to 980 N/cm. The treatment time may range from 5 minutes to 24 hours. In one embodiment, the treatment time ranges from 10 minutes to 20 hours. The rotation rate may range from 2 rpm (revolutions per minute) to 1,000 rpm. In one embodiment, the rotation rate may range from 5 rpm to 1,000 rpm, and in a further embodiment, the rotation rate may- range from 10 rpm to 800 rpm.

After at least partially coating the inorganic core with binder, the organic or inorganic coloring substance can be added and mixed with agitation so that it adheres to the layer of binder.

Examples of addition methods are continuous addition in large quantities, or in small quantities.

Mixing and agitation, whether of the inorganic cores with the binder or of the organic or inorganic coloring substance with the inorganic cores coated with binder, may be carried out using an apparatus which can apply a sharp shearing and/or compressive force to the mixture of powders. Examples of apparatus of that type are roller mixers, blade mixers, and the like. In one embodiment, roller mixers are used. Examples of apparatus that may be used are taught in European Patent No. EP 1184426 A2.

Another method for manufacturing a composite pigment has been described in Japanese Patent No. JP 3286463, which discloses a solution precipitation process. The organic coloring substance can be dissolved in ethanol and the inorganic cores then dispersed in the ethanolic solution.

An aqueous alkaline solution of sodium or potassium carbonate can then be slowly added to these mixtures and finally, an ethanolic calcium chloride solution can be slowly added, with constant agitation.

As the composite pigment, mention may be made of: mixture of synthetic titane dioxide (CI77891), FD&C Blue Aluminium lake (CI42090) and polymethylhydrogensiloxane

(respective weight proportions 58.1/40.7/1.2); mixture of synthetic titane dioxide (CI77891), D&C Red n° 7

(CI15850) and polymethylhydrogensiloxane (respective weight proportions 65.8/32.9/1.3); mixture of synthetic titane dioxide (CI77891), D&C Red n° 28

(CI45410) et polymethylhydrogensiloxane (respective weight proportions 65.8/32.9/1.3); mixture of synthetic titane dioxide (CI77891), laque jaune FD&C Yellow 5 Aluminium lake (CI191140) ; and polymethylhydrogensiloxane (respective weight proportions 65.8/32.9/1.3); and mixture thereof.

According to a preferred embodiment, the powdery composition according to the present invention contains a composite pigment comprising a mixture of synthetic titane dioxyde (CI77891), FD&C Blue Aluminium lake (CI42090) and polymethylhydrogensiloxane (respective weight proportions 58.1/40.7/1.2).

The total amount of the non-magnetic pigment may be from 0.01 to 30% by weight, preferably from 0.1 to 25% by weight, more preferably from 0.5 to 20% by weight, more preferably from 1 to 15% by weight, relative to the total weight of the powdery cosmetic composition.

(Magnetic Particle)

The powdery cosmetic composition according to the present invention may comprise at least one magnetic particle. The term 'magnetic particle' means particles presenting magnetic susceptibility, i.e., particles that are sensitive to the action of a magnetic field, and that tend to come into alignment with the field lines, for example.

However, the amount of the magnetic particle (e.g., magnetic pigment) , if present, is limited such that the ratio of the nonmagnetic pigment/the magnetic particle when the magnetic particle is present in the powdery cosmetic composition is 1 or more, preferably 2 or more, more preferably 5 or more, more preferably 20 or more, more preferably 30 or more, more preferably 40 or more, more preferably 50 or more, and most preferably 100 or more.

Preferably, the powdery cosmetic composition according to the present invention comprises no magnetic particle.

As the magnetic particle, any inorganic or organic pigment which is capable of having magnetism may be used. For example, nacres comprising iron oxide Fe₃θ₄ may be used as the magnetic pigments. By way of example, nacres pigments presenting magnetic properties are those sold under the trade names COLORONA BLACKSTAR BLUE, COLORONA BLACKSTAR GREEN, COLORONA BLACKSTAR GOLD, COLORONA BLACKSTAR RED, CLOISONNE NU ANTIQUE SUPER GREEN, MICRONA MATTE BLACK (17437), MICA BLACK (17260), COLORONA PATINA SILVER (17289), and COLORONA PATINA GOLD (117288) by MERCK, or indeed FLAMENCO TWILIGHT RED, FLAMENCO TWILIGHT GREEN, FLAMENCO TWILIGHT GOLD, FLAMENCO TWILIGHT BLUE, TIMICA NU ANTIQUE SILVER 110 AB, TIMICA NU ANTIQUE GOLD 212 GB, TIMICA NU-ANTIQUE COPPER 340 AB, TIMICA NU ANTIQUE BRONZE 240 AB, CLOISONNE NU ANTIQUE GREEN 828 CB, CLOISONNE NU ANTIQUE BLUE 626 CB, GEMTONE MOONSTONE G 004, CLOISONNE NU ANTIQUE RED 424 CHROMA-LITE, BLACK (4498), CLOISONNE NU ANTIQUE ROUGE FLAMBE (code 440 XB), CLOISONNE NU ANTIQUE BRONZE (240 XB), CLOISONNE NU ANTIQUE GOLD (222 CB), and CLOISONNE NU ANTIQUE COPPER (340 XB) by ENGELHARD.

The preferable examples of the magnetic particle that may also be mentioned are black iron oxide particles, e.g., those sold under the trade name SICOVIT noir E172 by BASF. The magnetic particle may also comprise metallic iron, in particular passivated soft iron, e.g., obtained from carbonyl iron by implementing the method described in U.S. Pat. No. 6,589,331, the content of which is incorporated herein by reference. The particles may include an oxide surface layer.

The magnetic particle may be in the form of spherical particles or flakes. The size of the magnetic particle may be less than or equal to 10 μm, or even 1 μm or less.

The amount of the magnetic particle (s), if present, may be from 0.00001 to 0.5% by weight, preferably from 0.00001 to 0.3% by weight, more preferably from 0.00001 to 0.1% by weight, relative to the total weight of the powdery cosmetic composition.

The total amount of the magnetic particle, if present, and the non-magnetic pigment may be from 0.1 to 25% by weight, preferably from 0.1 to 20% by weight, more preferably from 0.1 to 15% by weight, relative to the total weight of the cosmetic. Most preferably, the powdery cosmetic composition according to the present invention comprises no magnetic particle.

The powdery cosmetic composition according to the present invention comprises no magnetic particle or even if the composition comprises a magnetic particle or particles, the amount thereof is at most that of non-magnetic pigment (s). Accordingly, the powdery cosmetic composition according to the present invention is not affected or very slightly affected by magnetism. Consequently, the powdery cosmetic composition according to the present invention can be preferably prepared by using a wet- process.

(Additional Components)

The powdery cosmetic composition may further comprise at least one additional component which is commonly used in cosmetics. The additional component is preferably insoluble in the liquid medium used in a wet-process, and is preferably non-magnetic. As the additional component, mention may be made of at least one additional filler. The additional filler (s) may be mineral or organic and of any shape, such as platelet-shaped, spherical or oblong, irrespective of their crystallographic form (for example lamellar, cubic, hexagonal, orthorhombic, etc.).

Additional filler (s) that may be used in the compositions include talc, silica, kaoline, polyamide powders (Nylon®) , poly-β-alanine powders, polyurethane powders, polyethylene powders, polystyrene powders, (meth) acrylate powders, fluoropolymer powders such as polytetrafluoroethylene powders (Teflon®) , lauroyllysine, starch, boron nitride, acrylic acid polymer powders, silicone powders such as silicone resin powders (for example Tospearls® from Toshiba), precipitated calcium carbonate, magnesium carbonate, magnesium hydrocarbonate, hydroxyapatite, glass beads and ceramic beads. A single type of additional filler or a combination of two or more types of additional fillers may be used.

The ratio between the above (essential) specific filler (s) /additional filler (s) is 1 or more.

The additional filler (s) may be present in the powdery cosmetic composition ^"in an amount ranging from 0.1% to 50% by weight, preferably 0.1% to 40% by weight, more preferably 0.1% to 30% by weight, more preferably 0.1% to 20% by weight, and most preferably 0.1% to 10% by weight, relative to the total weight of the powdery cosmetic composition.

If necessary, the powdery cosmetic composition according to the present invention may comprise at least one binder. As the binder, mention may be made of silicones, plant and animal oils, synthetic oils, waxes, higher fatty acids, higher alcohols, and the like.

The binder (s) may be present in the powdery cosmetic composition in an amount ranging from 0.1% to 15% by weight, preferably 0.1% to 10% by weight, more preferably 0.1% to 5% by weight, more preferably 0.1% to 3% by weight, and most preferably 0.1% to 1% by weight, relative to the total weight of the powdery cosmetic composition . The powdery cosmetic composition according to the present invention may further comprise other optional component (s) such as preservatives, surfactants, anti-oxidants, perfumes, humectants, UV filters, vitamins, and the like.

These optional component (s) may be present in the powdery cosmetic composition in an amount ranging from 0.1% to 5% by weight, preferably 0.1% to 3% by weight, more preferably 0.1% to 1% by weight relative to the total weight of the powdery cosmetic composition .

■(Preparation Method)

Next, the method for preparing a cosmetic according to the present invention, based on a wet-process, will be explained below in more detailed way.

The method for preparing a cosmetic according to the present invention employs a wet process for preparing a cosmetic such as a powdery cosmetic composition according to the present invention as described above. The employed wet process includes the steps of dispersing at least a powder in a liquid to obtain a slurry; shaping the slurry in a container by compression or aspiration; and drying the shaped slurry. The details of each step will be explained below.

(Dispersing Step)

In this step, at least a powder is dispersed in a liquid to prepare a slurry. The slurry here means a thick suspension of the powder in the liquid.

As explained above, -the powder comprises at least one non-magnetic pigment, as an essential component, and may comprise at least one magnetic particle, as an optional component. The powder preferably comprises at least one specific filler as explained above. The powder may further comprise further additional components as described above. It is most preferable that the powder comprises no magnetic particle. If a magnetic particle or particles are present in the powder, the amount of the magnetic particle (s) is limited such that the ratio of the non-magnetic pigment/the magnetic particle when the magnetic particle is present in the powdery cosmetic composition is 1 or more, preferably 2 or more, more preferably 5 or more, more preferably 20 or more, more preferably 30 or more, more preferably 40 or more, more preferably 50 or more, and most preferably 100 or more.

Accordingly, the powder may be prepared before the dispersing step by mixing only non-magnetic pigment (s), or by mixing non-magnetic pigment (s) with a small amount of magnetic particle (s) such that the ratio of the non-magnetic pigment (s) /the magnetic particle (s) is 1 or more.

Alternatively, the powder may be prepared before the dispersing step by replacing at least a part of magnetic particle (s) in a powder comprising the magnetic particle (s) with at least one nonmagnetic pigment. In this case, preferably, all the magnetic particle (s) is/are replaced with the non-magnetic pigment (s).

The liquid is typically a solvent, preferably a volatile solvent. As the volatile solvent, mention may be made of water, lower alcohols such as ethanol and isopropanol, ethers, fluorocarbons, volatile silicones such as low molecular weight cyclic or linear silicones, and hydrocarbons such as light liquid isoparaffin. In terms of usability, isopropanol and light liquid isoparaffin are preferable. Light liquid isoparaffin is most preferable. The above volatile solvent may be use alone or in_ combination.

According to the present invention, for example, the powder is weighed, and mixed by any mechanical means such as a Henschel mixer. Preferably, the mixed powder may be subjected to milling by, for example, a hammer mill.

Then, the mixed powder is weighed, and dispersed into the liquid in an appropriate vessel such as a bowl. This dispersing step may be performed in a planetary mixer. The time required for dispersing is not limited, and may depend on some factors such as mixing means. For example, if a planetary mixer is used for dispersing, from about 15 minutes to about 20 minutes may be necessary.

The amounts of the powder and the liquid are not limited. The ratio of the amount of the liquid to that of the powder may be determined in terms of usability. If the amount of the liquid is too high, the obtained slurry may overflow or drip off from a container in the next shaping step, or may shrink too much after the last drying step. On the other hand, if the amount of the liquid is too low, the obtained slurry may not easily be shaped in the next shaping step, or may have cracks after the last drying step. For example, the powder and the liquid may be used in a weight ratio of 5:1, preferably 3:1, and more preferably 2:1.

If necessary, degassing may be performed during this dispersing step. The degassing can be performed, for example, by dispersing the powder into the liquid in a vacuum chamber. The time required for degassing is not limited, and may depend on some factors such as the pressure in the vacuum chamber. For example, degassing may be performed from about 15 minutes to about 20 minutes. It is preferable to stir the slurry for efficient degassing.

If necessary, the above mixing step for the powder before the dispersing step can be merged with the dispersing step. In other words, the powder may be weighed and directly dispersed into the liquid without the previous mixing step which may be followed by the milling step.

(Shaping Step)

In this step, the slurry is shaped in a container by compression or aspiration. For example, the slurry obtained by the previous dispersing step is poured into a container, and the slurry is pressed and/or aspirated to give a shape to the slurry.

As the container, any vessel such as a dish or a pan can be used. Preferably, a pan may be used as the container. The container may have small holes through which the components of the cosmetic cannot move but a solvent can move for aspiration of the solvent. The mode of pouring the slurry into a container is not limited. Typically, there are two modes, i.e., top injection and back injection.

According to the top injection, the slurry is poured into a container from the top of the container. The top injection is preferable to prepare a cosmetic product having a plurality of colors. Further, the top injection is more cost effective as compared to the back injection, because the container does not need to have a complicated mechanism for injection of the slurry.

According to the back injection, the slurry is poured into a container from the bottom of the container. For the injection, the bottom of the container typically needs to have a mechanism for supplying the slurry into the container. The back injection is preferable to prepare a cosmetic product with a large scale. Further, the back injection can easily prepare a cosmetic product with a complicated shape. The slurry introduced into a container is shaped by compression and/or aspiration. Preferably, the press and aspiration are performed simultaneously.

The compression may be performed by pressing the slurry in a container by a mechanical means such as a press member having a plane surface. The aspiration may be performed, for example, by reducing the pressure in the container by vacuuming. The compression and aspiration may be performed several times. If necessary, vibration may be given to the container and/or the press member. It is preferable that at least a part of the liquid in the slurry is removed by the compression and the aspiration to solidify the slurry. It is more preferable that a large part of the liquid is removed from the slurry.

(Drying Step)

In this step, the shaped slurry is dried to obtain a cosmetic. By drying, the solvent remaining in the slurry can be completely removed. The temperature for drying depends on several factors such as the components of the cosmetic and the type of the used solvent. For example, the drying may be performed at from about 60° to 100°. The time required for drying also depends on the above factors. For example, the drying is performed for about 1 to 6 hours.

The wet process employed in the preparation method according to the present invention is advantageous because it can prepare a cosmetic including a large amount of powder, with a low amount of binder, as compared to a dry process. Furthermore, the wet process can provide easily a cosmetic with a plurality of colors or an irregular shape such as a star.

On the other hand, it should be noted that so-called semi-wet process, in which only a small amount of a solvent is used and a slurry is not prepared, does not correspond to the wet-process. In the semi-wet process, the solvent may not be removed. Furthermore, another process in which a slurry is prepared but dried before being pressed, and the dried matter is broken to be pressed does not correspond to the wet process either.

The cosmetic prepared by the preparation method according to the present invention can have smooth texture and good drop resistance Furthermore, the cosmetic prepared by the preparation method according to the present invention can have wet feeling, good spreadability and the like.

The cosmetic prepared by the preparation method according to the present invention is preferably in the form of a powdery cosmetic product such as a powdery foundation, a pressed powder and a deodorant powder. In particular, the preparation method according to the present invention is useful for preparing a powdery make-up cosmetic in the form of a compacted powder such as a compacted powdery foundation.

EXAMPLES

The present invention will be described in more detail by way of examples, which however should not be construed as limiting the scope of the present invention. The powdery cosmetic compositions according to Example 1 and Comparative Example 1 which have the following formulas shown in Table 1 were prepared. The numerals in Table 1 are based on percentage by weight relative to the total weight of the composition.

Table 1

*= Mixture of synthetic titane dioxyde (CI77891), FD&C Blue Aluminium lake (CI42090) and polymethylhydrogensiloxane (respective weight proportions 58.1/40.7/1.2).

The process for preparing the powdery cosmetic compositions according to Example 1 and Comparative Example 1 was as follows

(1) Dry Powder Preparation

The raw materials were weighed and mixed by a cutter mixer, The mixture was milled by a hammer mill.

[2) Slurry Preparation 5Og of the obtained dry powder was charged into a stainless bowl. 28g of light liquid isoparaffin was added, and mixed by hand with a rubber spatula.

(3) Wet Process

The obtained slurry was poured into a metal pan. The slurry was subjected to servo press at 445 KPa (100 kgf) for two seconds with aspiration. This step was repeated three times. The remaining powder in the metal pan was dried at 7O⁰C for 6 hours to obtain a powdery cosmetic in the form of a compacted powder.

The obtained powdery cosmetic compositions according to Example 1 and Comparative Example 1 were evaluated as follows.

(A) Visual Evaluation

The photographs of the powdery cosmetic compositions according to Example 1 and Comparative Example 1 were taken and compared with each other. The surface of Example 1 was homogenous whereas the surface of Comparative Example 1 was inhomogeneous as compared to Example 1. The photographs are shown in Figure 1.

(B) Color Difference Evaluation 1

The surface color of Example 1 just after pressing the mixture according to Example 1 obtained by the above (1) Dry Powder Preparation was measured by a Konica-Minolta CR-200 colorimeter, and was compared with the surface color of Example 1 after the above (3) Wet Process. The same procedures were repeated for Comparative Example 1. The results are shown in Table 2.

Table 2

In Table 2, "Dry" column corresponds to the surface color just after pressing the mixture obtained by the above (1) Dry Powder Preparation, and "Wet" 'column corresponds to the surface color after the above (3) Wet Process.

It is clear that the difference in the surface color between "Dry" and "Wet" for Example 1 is smaller than that for Comparative Example 1. Thus, the control of the surface color of a final product is easier for Example 1 than Comparative Example 1. This indicates that the difference in the surface color can be suppressed by not using black iron oxide which is a magnetic pigment.

(C) Color Difference Evaluation 2

A part of the powdery cosmetic composition according to Example 1 was taken from the surface of the composition, followed by measuring the surface color by a Konica-Minolta CR-200 colorimeter, This step was repeated 100 times, and the change in color was determined. The same procedure was repeated for Comparative Example 1. The results are shown in Table 3 and Figure 2.

Table 3

In Table 3, the L*, C* and h at "0" column corresponds to the surface color just after- the above (3) Wet Process (see the column "Wet" in Table 2) .

It is clear that the difference in the surface color and the internal color of the powdery cosmetic composition is smaller in Example 1 as compared to Comparative Example 1. Thus, the control of the color of a final product is easier for Example 1 than Comparative Example 1. This indicates that the difference in the color change between the surface and the inside of the powdery cosmetic composition can be suppressed by not using black iron oxide which is a magnetic pigment.

(D) Evaluation of Influence by Magnetism

The slurries according to Example 1 and Comparative Example 1, just after the above (2) Slurry Preparation, were compared in terms of behavior on a magnet.

The photographs of the slurries according to Example 1 and Comparative Example 1 were taken 3 minutes after the above (2) Slurry Preparation which was performed on plastic plates not on stainless bowels. The photographs are shown in the top line of Figure 3.

The bottom of the plastic plates which store the slurries were scratched with a magnet, and photographs were taken. The photographs are shown in the middle line of Figure 3.

Next, the slurries were mixed again with a rubber spatula, and photographs thereof were taken. The photographs are shown in the bottom line of Figure 3.

As shown in Figure 3, black lines and pale marks are shown in Comparative Example 1 just after being scratched by a magnet as well as after being mixed again with a rubber spatula after the scratching by a magnet. This indicates that black iron oxide which is a magnetic pigment was magnetized and aggregated as black lines or was collected on the bottom of the plastic plate which created the pale marks on the surface.

It is clear that the black lines and the pale marks are not present on the surface of Example 1. Thus, the control of the color of a final product is easier for Example 1 than Comparative Example 1. This indicates that uniform color can be obtained by not using black iron oxide which is a magnetic pigment but by using a non-magnetic pigment such as a composite pigment comprising mixture of synthetic titanium dioxide (CI77891), FD&C Blue aluminum lake (CI42090) and polymethylhydrogensiloxane (respective weight proportions 58.1/40.7/1.2).

Both compositions (Example 1 according to the present invention and Comparative Example 1) have been evaluated by a panel of 6 Japanese women by a comparative test (half face) : the cosmetic according to Example 1 provides a glittering texture and better make-up results in terms of capability of covering the skin color, hiding skin relief defects such as skin pores, hiding skin colour defect, with a radiant finish than the cosmetic according to Comparative Example 1.

Claims

1. A powdery cosmetic composition in the form of compacted powder comprising a pulverulent phase comprising:

(b) at least one non-magnetic pigment; and

(c) optionally at least one magnetic particle, wherein the ratio of the non-magnetic pigment (s) /the magnetic particle (s) when the magnetic particle (s) is/are present in the powdery cosmetic composition is 1 or more.

2. A powdery cosmetic according to claim 1, wherein the filler is selected from natural mica, synthetic mica, sericite, elastomeric crosslinked organopolysiloxane powders, and mixture thereof.

3. The powdery cosmetic composition according to Claim 1 or 2, wherein the magnetic particle (s) comprise (s) black iron oxide.

4. The powdery cosmetic composition according to any one of Claims 1 to 3, wherein the non-magnetic pigment (s) comprise (s) a composite pigment comprising an inorganic core which is at least partially coated with at least one organic or inorganic coloring substance.

5. The powdery cosmetic composition according to Claim 4, wherein the composite pigment comprises at least one binder for fixing the organic or inorganic coloring substance on the inorganic core .

6. The powdery cosmetic composition according to any one of Claims 1 to 5, wherein the total amount of the non-magnetic pigment (s) and the magnetic particle (s), if present, is from

0.1 to 25% by weight relative to the total weight of the powdery cosmetic composition.

7. The powdery cosmetic composition according to any one of Claims 1 to 6, wherein the total amount of the pulverulent phase is from 80 to 95% by weight relative to the total weight of the powdery cosmetic composition.

8. The powdery cosmetic composition according to any one of Claims 1 to 7, wherein the amount of the filler is 60% by weight or more relative to the total weight of the powdery cosmetic composition.

9. A method for preparing a cosmetic comprising the steps of: dispersing at least a powder comprising at least one nonmagnetic pigment in a liquid to obtain a slurry; shaping the slurry in a container by compression or aspiration; and drying the shaped slurry, characterized in that the powder comprises no magnetic particle (s), or when the powder comprises magnetic particle (s), the quantity of the magnetic particle (s) is such that the ratio of the non-magnetic pigment ( s) /the magnetic particle (s) in the cosmetic is 1 or more.

10. The method according to Claim 9, wherein at least a part of the liquid is removed in the shaping step.

11. The method according to Claim 9 or 10, wherein the pulverulent phase comprises no magnetic particle (s).

12. The method according to any one of Claims 9 to 11, wherein the magnetic particle (s) comprise (s) black iron oxide.

13. The method according to any one of Claims 9 to 12, wherein the non-magnetic pigment (s) comprise (s) a composite pigment comprising an inorganic core which is at least partially coated with at least one organic or inorganic coloring substance and at least one binder for fixing the organic or inorganic coloring substance on the inorganic core.

14. The method according to any one of Claims 9 to 13, wherein the total amount of the non-magnetic pigment (s) and the magnetic particle (s), if present, is from 0.1 to 25% by weight relative to the total weight of the cosmetic.

15. The method according to any one of Claims 9 to 14, wherein the total amount of the powder is from 80 to 95% by weight relative to the total weight of the cosmetic.

16. A cosmetic obtainable by the method according to any one of Claims 9 to 15.