A cosmetic powder composition

Abstract

The present invention relates to a cosmetic powder composition. Particularly, the present invention relates to a cosmetic powder composition that provides improved oil absorption and / or sweat / water absorption. The present invention also relates to a cosmetic powder composition that provides improved flowability.

Description

[0001] P0001199EP CPL

[0002] 1

[0003] A COSMETIC POWDER COMPOSITION

[0004] Field of the invention

[0005] The invention relates to a cosmetic powder composition. Particularly, the present invention relates to a cosmetic powder composition e.g. a face / body powder, that provides improved oil absorption and / or sweat / water absorption.

[0006] Background of the invention

[0007] A few cosmetic powder compositions e.g. a face / body powder, are known in the art. Consumers tend to use such cosmetic powders with an intention of keeping their body surfaces oil-free, sweat / water-free. Such body surfaces include face, neck, armpits, etc., which consumers want to maintain sweat-free, sebum-free, and cooled as preferred. Typically, they prefer to use such cosmetic powders post shower. Such cosmetic powders are typically available in a suitable container, many a times with perforated caps, for allowing the powder to be sprinkled on body surfaces directly from such containers.

[0008] As consumers tend to look forward to such cosmetic powder compositions that provide benefits e.g. oil absorption I sweat / water absorption, to an improved extent. A need therefore exists to provide such cosmetic compositions that provide benefits e.g. oil absorption / sweat absorption, to an improved extent. Further, such cosmetic compositions typically contain fragrance which are often oil / oily compounds. Thus, providing improved oil absorption despite the cosmetic powder composition contains oils itself, is further challenging. A need also exists to provide such cosmetic compositions that provide improved flowability. A need also exists to provide such cosmetic compositions that provide benefits e.g. oil absorption I sweat / water absorption, whilst providing improved flowability.

[0009] The present inventors have solved one or all of the problems cited above and have provided an improved cosmetic powder composition which that provides improved oil absorption and / or water absorption efficacy. Moreover, such improved oil absorption is delivered despite the composition itself contains oils to an extent. Moreover, such cosmetic composition that provides improved flowability is also obtained. Additionally, such cosmetic composition that provides benefits e.g. oil absorption I sweat / water absorption whilst providing improved flowability, is obtained. Such benefits are obtained despite the composition is substantially free of talc.

[0010] Summary of the inventionP0001199EP CPL

[0011] 2

[0012] Accordingly, in a first aspect, the present invention relates to a cosmetic powder composition comprising:

[0013] a. a particulate material having Mohs hardness in the range from 2 to 7 selected from mica, kaolin, perlite and mixtures thereof,

[0014] b. an inorganic salt selected from calcium carbonate, magnesium carbonate, and mixtures thereof; and

[0015] wherein the weight ratio of the particulate material to the inorganic salt is in the range from 1:1 to 30:1,

[0016] wherein the composition is substantially free of talc.

[0017] Detailed description of the invention

[0018] All other aspects of the present invention will more readily become apparent from the description and examples which follow. Any feature of one aspect of the present invention may be utilized in any other aspect of the invention. The word “comprising” is intended to mean “including” but not necessarily “consisting of” or “composed of.” In other words, the listed steps or options need not be exhaustive. Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of materials or conditions of reaction, physical properties of materials and / or use are to be understood as modified by the word “about”. Numerical ranges expressed in the format " x to y" are understood to include x and y. When for a specific feature multiple preferred ranges are described in the format "x to y", it is understood that all ranges combining the different endpoints are also contemplated. Unless specified otherwise, amounts as used herein are expressed in percentage by weight based on total weight of the composition and may be abbreviated as “wt%”. The use of any and all examples or exemplary language e.g. “such as” provided herein is intended merely to better illuminate the invention and does not in any way limit the scope of the invention otherwise claimed. Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of materials or conditions of reaction, physical properties of materials and / or use may optionally be understood as modified by the word “about”.

[0019] The composition of the invention is meant to be used for cosmetic use and could also be referred to as a “personal care composition”, is meant to include a composition for topical application to the skin e.g. sun-exposed areas or heat-exposed areas of the skin of humans. Such a composition is preferably a leave-on composition. "Skin" as used herein is meant to include skin on the face and body (e.g., neck, chest, back, arms, underarms, hands, legs and scalp). Such cosmetic powder composition includes any product applied to a human body for improving appearance, odour control or general aesthetics. The composition may be applied with anP0001199EP CPL

[0020] 3

[0021] implement or a pad, or a wipe or a patch. Non-limiting examples of such compositions include leave-on products like body powders, face powders.

[0022] In a first aspect, the present invention relates to a cosmetic powder composition comprising: a. a particulate material having Mohs hardness in the range from 2 to 7 selected from mica, kaolin, perlite and mixtures thereof,

[0023] b. an inorganic salt selected from calcium carbonate, magnesium carbonate and mixtures thereof; and

[0024] wherein the weight ratio of the particulate material to the inorganic salt is in the range from 1:1 to 30:1,

[0025] wherein the composition is substantially free of talc.

[0026] A powder

[0027] The composition as per the present invention (the composition) is in powder form suitable for cosmetic purpose. Preferably, the composition is in powder format such that the moisture content of the composition is in the range from 0.001 to 5 wt%, preferably from 0.01 to 4 wt%, preferably from 0.1 to 3 wt%, preferably from 0.1 to 2 wt%, preferably from 0.1 to 1 wt%.

[0028] Particulate materials having Mohs hardness from 2 to 7

[0029] The composition comprises a particulate material having Mohs hardness in the range from 2 to 7. Mohs hardness or simply Mohs scale is a well-known qualitative scale, introduced in 1812 by Fredrich Mohs, ranging from 1 to 10 characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

[0030] Preferably, the particulate material having Mohs hardness from 2 to 7 is selected from mica (Mohs hardness 2 to 3), kaolin (Mohs hardness 2 to 3), dolomite (Mohs hardness 3.5 to 4) and perlite (Mohs hardness 5 to 7). More preferably, the particulate material having Mohs hardness from 2 to 4 is selected; and the same is preferably selected from mica and kaolin described earlier.

[0031] If mica is selected as the or one of the particulate materials having Mohs hardness from 2 to 7, then it is preferably selected from lepidolite, biotite, phlogopite, muscovite and mixtures thereof. More preferably, it is selected from lepidolite, phlogopite, fluorophlogopite, muscovite and mixtures thereof. Even more preferably, it is selected from phlogopite, muscovite; and further more preferably, muscovite is used as the mica.P0001199EP CPL

[0032] 4

[0033] Preferably, the average particle size of the particulate material having Mohs hardness from 2 to 7, is in the range from 0.1 to 100 microns, preferably from 1 to 95 microns, preferably from 5 to 90 microns, preferably from 10 to 80 microns, preferably from 20 to 70 microns, preferably from 30 to 60 microns, preferably from 35 to 45 microns.

[0034] Preferably, the composition comprises from 30 to 95 wt%, preferably from 35 to 92 wt%, preferably from 40 to 90 wt%, preferably from 45 to 88 wt%, preferably 50 to 86 wt% of the particulate material having Mohs hardness in the range from 2 to 7, preferably from 2 to 4, described above.

[0035] Inorganic salts

[0036] The composition comprises an inorganic salt selected from calcium carbonate, magnesium carbonate and mixtures thereof. More preferably, calcium carbonate is used as the inorganic salt in the composition.

[0037] Preferably, the composition comprises the inorganic salt in the range from 5 to 30 wt%, preferably 7 to 28 wt%, preferably 10 to 25 wt%, preferably 13 to 22 wt%, preferably 15 to 20 wt%.

[0038] Weight ratio of the particulate material having Mohs hardness in the range from 2 to 7 to the inorganic salt

[0039] The weight ratio of the particulate material having Mohs hardness in the range from 2 to 7 to the inorganic salt (the weight ratio) is in the range from 1:1 to 30:1. Preferably, the weight ratio is in the range from 1:1 to 20:1, preferably 1:1 to 10:1, preferably 2:1 to 9:1, preferably 3:1 to 7:1, preferably 4:1 to 6:1.

[0040] For example, if mica is used as the particulate material with Mohs hardness 2 to 3 and calcium carbonate is used as the inorganic salt, then the weight ratio of mica to calcium carbonate is in the range from 1:1 to 30:1. As in, mica and calcium carbonate may be used in amounts such that their weight ratio is in the range from 1:1 to 30:1.

[0041] For example, if mica is used in 84.26 wt% and calcium carbonate is used in 13 wt%, then the weight ratio is 6.48:1.

[0042] It will be understood that if more than one particulate materials having Mohs hardness in the range from 2 to 7 are used, then for calculation of the weight ratio, sum of the weight of all the particulate materials is to be taken into account. Likewise, if more than one inorganic salt is used,P0001199EP CPL

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[0044] then for calculating the weight ratio, the sum of the wight of all the inorganic salts is to be taken into account.

[0045] For example, if the composition comprises mica (30 wt%) and kaolin (55.26 wt%), then 85.26 wt% is to be taken into account for calculating the weight ratio. Likewise, if calcium carbonate (13 wt%) is used in addition to magnesium carbonate (13 wt%), then 26 wt% is to be taken for calculating the weight ratio.

[0046] The composition is substantially free of talc. Preferably, ‘substantially free’ as used in this context means that the composition comprises less than 0.1 wt% talc, more preferably less than 0.01 wt% talc, even more preferably less than 0.001 wt% talc, further more preferably less than 0.0001 wt% talc. Ideally, the composition is absolutely free of talc. In other words, the composition preferably comprises 0 to 0.1 wt% talc, preferably 0 to 0.001 wt% talc, preferably 0 to 0.0001 wt% talc. The Mohs hardness of talc is equal to 1.

[0047] It has been found that when the particulate material having Mohs hardness in the range from 2 to 7 is combined with the inorganic salts in the weight ratios as described above, the oil absorption and / or water absorption efficacy of the cosmetic powder was improved. Preferably, the composition comprises mica and / or kaolin as the particulate materials having Mohs hardness in the range from 2 to 4 in combination with calcium carbonate as the inorganic salt in ratios described hereinabove. Further, it has also been found that the composition of the present invention provided improved flowability. Further, it has also been found that the composition of the present invention provided benefits e.g. the oil absorption and / or water absorption efficacy, whilst providing improved flowability.

[0048] Preferably, flowability of the composition is expressed in terms of the effective angle of internal friction (denoted by bJ; measured in degrees (°)). The effective angle of internal friction (GJ), in the context of powders e.g. the cosmetic powder of the present invention, refers to the shear resistance between powder particles when they slide over each other under stress. It indicates how easily the powder flows. A lower bJ means smoother, more free-flowing powder, while a higher bJ means greater inter-particle friction and poorer flow. The effective angle of internal friction is preferably measured using a Powder Flow Tester (PFT).

[0049] Preferably, the effective angle of internal friction of the composition is in the range from 15° to 35°, preferably from 17° to 34°, preferably from 20° to 32°, preferably from 23° to 32°, preferably from 25° to 32°.P0001199EP CPL

[0050] 6

[0051] Accordingly, in a preferred aspect, the present invention relates to a cosmetic powder composition comprising:

[0052] a. a particulate material having Mohs hardness in the range from 2 to 7 selected from mica, kaolin, perlite and mixtures thereof,

[0053] b. an inorganic salt selected from calcium carbonate, magnesium carbonate, and mixtures thereof; and

[0054] wherein the weight ratio of the particulate material to the inorganic salt is in the range from 1 :1 to 30:1,

[0055] wherein the composition is substantially free of talc; and

[0056] wherein the effective angle of internal friction of the composition is in the range from 15° to 35°. Preferably, the effective angle of internal friction is measured using a PFT e.g. Brookfield PFT.

[0057] In addition to the ingredients described hereinabove, the composition preferably further comprises a polysaccharide. Preferably, the polysaccharide may be selected from starch (commercially available as BEALITE BY ROQUETTE® ST 005, from Roquette, France), hydrophobically modified starch, or phosphate-modified starch, microcrystalline cellulose. Preferably, the polysaccharide selected is a hydrophobically modified starch e.g. aluminum starch octenylsuccinate (commercially available as DRY-FLO® PC, from Nouryon, also available commercially as AGENAFLO OS 9051, from AGRANA Starke GmbH, Austria).

[0058] Preferably, the composition comprises a polysaccharide selected from those described above in amounts ranging from 0.1 to 5 wt%, preferably from 0.2 to 3 wt% e.g. 1 wt%.

[0059] Preferably, the weight ratio of the sum of the particulate materials having Mohs hardness from 2 to 7 and the inorganic salts as described above to the polysaccharide described above is in the range 15:1 to 200: 1 , preferably 19: 1 to 180: 1 , 25: 1 to 150: 1.

[0060] For example, if the composition comprises 70 wt% mica, 25 wt% kaolin and 5 wt% aluminum starch octenylsuccinate, then the weight ratio of the sum of amounts of mica and kaolin to the that of aluminum starch octenylsuccinate, is 19:1.

[0061] When a polysaccharide as described above is incorporated in the composition, it was found that it improved tactile sensory properties of the composition.

[0062] Preferably, the composition further comprises oils, solvents and silicones. Examples of solvents that may be contained in the composition include Dipropylene Glycol, Isopropylene glycol andP0001199EP CPL

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[0064] mixtures thereof. Examples of oil include fragrance oils, and that of silicones include dimethicone, cyclopentasiloxane, cyclohexasiloxane and mixtures thereof.

[0065] Preferably, the composition comprises such oils, solvents or a silicone, either individually or collectively, in amounts ranging from 0.1 to 5 wt%, preferably from 0.2 to 4 wt% preferably from 0.25 to 2 wt%.

[0066] Preferably, the composition further comprises optional ingredients selected from fragrances; cooling agents e.g. menthol, camphor, menthyl lactate; vitamins e.g. vitamin B3 (niacinamide), vitamin E; antibacterial essential oils e.g. eugenol, and geraniol; colourants e.g. iron oxides; and sunscreens and instant brightening agents e.g. titanium dioxide.

[0067] If added to the composition, such optional ingredients are added to the composition individually or collectively, in amounts ranging from 0.001 to 5 wt%, preferably from 0.01 to 4 wt%, preferably from 0.1 to 3 wt%, preferably from 0.25 to 2 wt%, preferably from 0.5 to 1 wt%.

[0068] In another aspect, the present invention relates to a method of providing improved sweat absorption wherein the method comprises the step of applying on to skin, the composition of the first aspect described hereinabove. Preferably, the composition is applied at least once daily and preferably at least twice in a day. Preferably, the method is non-therapeutic.

[0069] When the composition of the invention is applied on to skin, improved sweat absorption was obtained.

[0070] The composition may be packaged into a suitable container e.g. a squeezable bottle with a perforated rotatable lid for opening and closing the container before and after the use. Typically, consumers tend to open the bottle by rotating the rotatable lid, squeeze the bottle by applying manual pressure to sprinkle the powder directly on to the area of application e.g. arm pits, or squeeze out on hands and apply the powder to a desired skin surface.

[0071] In yet another aspect, the present invention relates to a method of providing improved oil absorption wherein the method comprises the step of applying on to skin, the composition of the first aspect described hereinabove. Preferably, the composition is applied at least once daily and preferably at least twice in a day. When the composition of the invention is applied on to skin, improved oil absorption was obtained. Preferably, the method is non-therapeutic.P0001199EP CPL

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[0073] In yet another aspect, the present invention relates to a method of providing improved water absorption wherein the method comprises the step of applying on to skin, the composition of the first aspect described hereinabove. Preferably, the composition is applied at least once daily and preferably at least twice in a day. When the composition of the invention is applied on to skin, improved water absorption was obtained. Preferably, the method is non-therapeutic.

[0074] Thus, when the composition of the present invention is used, improved water- or oil-absorption is provided meeting consumers’ requirement of keeping their body surfaces dry I less oily.

[0075] The invention is now further described by way of the following non-limiting examples.

[0076] Examples

[0077] Briefly, the compositions shown in tables below were prepared as follows:

[0078] Ingredients shown in tables below were accurately weighed and added into the blender and were mixed for 5 minutes. Aluminium starch octenyl succinate was obtained from AGRANA Starke GmbH, Austria (Catalogue: AGENAFLO OS 9051; with the starch obtained from corn with its geographical origin in Europe). Where applicable, all the liquid ingredients (except moisture / water) were weighed accurately and mixed them in a smaller side vessel. This mixture was added in the main blender and blended for another 5 minutes to ensure uniformity.

[0079] Oil absorption assessment was carried out as described below:

[0080] Compositions shown in tables below were weighed in a beaker. Linseed oil was added drop by drop from a burette into the beaker until the composition got converted into a dough. The weight of linseed oil so required was noted and expressed as grams per 100 g of the composition providing the amount of oil absorbed by a composition.

[0081] Sweat absorption assessment was carried out as described below:

[0082] Compositions shown in tables below were weighed in a beaker. Water was added drop by drop into the beaker, from a burette until the composition formed a dough. The volume of water so required was recorded and expressed as millilitres (mL) per 100 g of the composition.

[0083] The effective angle of internal friction (5 J)

[0084] The effective angle of internal friction is measured using AMETEK Brookfield PFT. Briefly, the empty powder trough was weighed and was then filled with a test sample and the surface was levelled and the trough was re-weighed to calculate net weight of the sample. Thereafter, the trough with a lid attached thereto, was installed in the sample port of the PFT. Thereafter, usingP0001199EP CPL

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[0086] a software (Powder Flow Pro, Version 1.3; Build 23), a flow function test was carried out using a 5-point shear cycle and the readings of the effective angle of internal friction were recorded (in Degrees). A lower 5J means smoother, more free-flowing powder, while a higher 5J suggests greater inter-particle friction and poorer flow. The procedure was repeated for different samples, after the trough and the lid were removed, emptied fully and cleaned with a brush.

[0087] Wall friction test

[0088] Wall friction test was carried out using the sample preparation steps as described above except that method for measurement of wall friction was selected in the software.

[0089] Bulk Density

[0090] Bulk density of a sample was measured using a stoppered graduated measuring cylinder, (250 cm3) with standard 'dropping box', to allow a 2.5 ±0.1 cm (~1 inch) vertical drop. 40.0 ± 0.1 grams of a test sample was taken on to a sheet of smooth paper and was transferred to the measuring cylinder (held at an angle of 45°) by sliding the sample from the paper smoothly and without jerking. The stopper was put on the cylinder, and the same was placed gently in the dropping box and box was closed. The cylinder was gently lifted by the neck, which protrudes from the box, to the full permitted height without jarring the cylinder against the upper stop. The cylinder was then allowed to drop once, and the volume (Vi) was recorded. This lifting and dropping cycle was repeated once every two seconds, turning the measuring cylinder through about 10° each time clockwise. The cycle was repeated for a total 50 times (50 drops). After 50 drops, the volume (V50) was recorded; and the bulk density was then calculated using the equation:

[0091] Bulk Density (50 drops) = W / V50

[0092] where,

[0093] W = weight of the sample,

[0094] Vi = Volume after 1 drop; and

[0095] V50 = Volume after 50 drops.

[0096] Table 1: Control compositions

[0097]

[0098] P0001199EP CPL

[0099] 10

[0100]

[0101] / "Weight ratio of Talc to CaCO3= 6.54:1]

[0102] Oil and water absorption for compositions shown in examples A to G was assessed as described earlier; and it was found to be as shown in table 2 below:

[0103] Table 2:

[0104]

[0105] Table 3: Compositions as per the present invention

[0106]

[0107] / "Weight ratio of Mica:CaCC>3 or (Mica + Kaolin):CaCC>3]

[0108] Oil and water absorption for compositions as per the present invention, examples 1 to 12 shown above, was assessed as described earlier; and it was found to be as show in table 4 below:P0001199EP CPL

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[0110] Table 4:

[0111]

[0112] Table 5: Additional compositions as per the present invention

[0113]

[0114] [*Weight ratio of Kaolin:CaCC>3 or (Kaolin+Mica):CaCC>3]

[0115] Oil and water absorption for additional compositions as per the present invention, examples 13 to 20, was assessed as described earlier; and it was found to be as shown in table 6 below:

[0116] Table 6:

[0117]

[0118] P0001199EP CPL

[0119] 12

[0120]

[0121] Further, additional composition as per the present invention, example 21; as shown in table 7 below, was prepared as described earlier.

[0122] Table 7: Additional composition as per the present invention

[0123]

[0124] / "Weight ratio of (Kaolin+Mica):CaCC>3]

[0125] The effective angle of internal friction for the composition of example 21 , and separately for each of the compositions of example B, C and E, was measured as described earlier, and was found to be as shown in table 8 below.

[0126] Table 8:

[0127]

[0128] Further, the bulk density (50 drops) was measured as described above, and was found to be as shown in table 9 below:

[0129] Table 9:

[0130]

Claims

P0001199EP CPL13Claims:

1. A cosmetic powder composition comprising:a. a particulate material having Mohs hardness in the range from 2 to 7 selected from mica, kaolin, perlite and mixtures thereof,b. an inorganic salt selected from calcium carbonate, magnesium carbonate, and mixtures thereof; andwherein the weight ratio of the particulate material to the inorganic salt is in the range from 1:1 to 30:1,wherein the composition is substantially free of talc.

2. The composition as claimed in claim 1 wherein the weight ratio of the particulate material to the inorganic salt is in the range from 1:1 to 20:1.

3. The composition as claimed in claim 1 wherein the weight ratio of the particulate material to the inorganic salt is in the range from 1:1 to 10:1.

4. The composition as claimed in any one of the preceding claims wherein the composition comprises from 30 to 95 wt% of the particulate material having Mohs hardness in the range from 2 to 7.

5. The composition as claimed in any one of the preceding claims wherein the particle size of the particulate material is in the range from 0.1 to 100 microns.

6. The composition as claimed in any one of the preceding claims wherein the particulate material is selected from mica, kaolin and mixtures thereof.

7. The composition as claimed in any one of the preceding claims wherein the particulate material is selected from mica selected from lepidolite, biotite, phlogopite, fluorophlogopite, muscovite and mixtures thereof.

8. The composition as claimed in any one of the preceding claims wherein the inorganic salt is selected from calcium carbonate.

9. The composition as claimed in any one of the preceding claims wherein the composition comprises from 5 to 30 wt% of the inorganic salt.

10. The composition as claimed in any one of the preceding claims wherein the particulate material is mica; and the inorganic salt is calcium carbonate.P0001199EP CPL1411. The composition as claimed in any one of the preceding claims wherein the particulate material is kaolin; and the inorganic salt is calcium carbonate.

12. The composition as claimed in any one of the preceding claims wherein the composition further comprises from 0.1 to 5 wt% of a polysaccharide.

13. The composition as claimed in any one of the preceding claims wherein the composition further comprises from 0.001 to 5 wt% moisture / water.

14. The composition as claimed in any one of the preceding claims wherein the composition further comprises from 0.1 to 5 wt% oils, solvents and silicones.

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