阅读说明：本技术 用于模糊皮肤的表面瑕疵的化妆品组合物 (Cosmetic composition for blurring surface blemishes of skin ) 是由 胡晴虹 王琳 朱树琦 于 2018-11-05 设计创作，主要内容包括：公开了一种化妆品组合物,其包含：a)包含壳和核的粒状材料,其中所述壳包含在25℃和波长589nm下折射率(n<Sub>s</Sub>)为1.2至2.0的水不溶性材料,核包含在25℃和波长589nm下折射率(n<Sub>c</Sub>)为至少1.0的流体,其中借助于采用亚麻籽油的刮刀磨损法,通过ASTM D281-95测量的所述粒状材料的吸油能力为至少300g/100g；以及b)平均粒径为0.1-100μm的粒状硅氧烷弹性体,其中所述粒状材料的量与所述粒状硅氧烷弹性体的量之比为按重量份计1:3.5至3.5:1。(Disclosed is a cosmetic composition comprising: a) particulate material comprising a shell and a core, wherein the shell comprises a refractive index (n) at 25 ℃ and a wavelength of 589nm s ) 1.2 to 2.0, a core comprising a refractive index (n) at 25 ℃ and a wavelength of 589nm c ) A fluid of at least 1.0, wherein the fluid is obtained by means of a scraper mill using linseed oilA loss of oil capacity of the particulate material, as measured by ASTM D281-95, of at least 300g/100 g; and b) a particulate silicone elastomer having an average particle diameter of 0.1-100 μm, wherein the ratio of the amount of the particulate material to the amount of the particulate silicone elastomer is 1:3.5 to 3.5:1 in parts by weight.)

1. A cosmetic composition comprising:

(a) particulate material comprising a shell and a core, wherein the shell comprises a refractive index (n) at 25 ℃ and a wavelength of 589nm_s) 1.2 to 2.0, the core comprising a refractive index (n) at 25 ℃ and a wavelength of 589nm_c) A fluid of at least 1.0, wherein the particulate material has an oil absorption capacity of at least 300g/100g as measured by ASTM D281-95 by means of the doctor blade abrasion method with linseed oil; and

(b) a particulate silicone elastomer having an average particle diameter of 0.1 to 100 μm,

wherein the ratio of the amount of the particulate material to the amount of the particulate silicone elastomer is from 1:3.5 to 3.5:1 parts by weight.

2. A cosmetic composition according to claim 1, wherein the particles of particulate silicone elastomer are spherical or spheroidal.

3. The cosmetic composition according to any one of claims 1 or 2, wherein the particle size of the particulate material is 0.1-2 μm.

4. The cosmetic composition of any one of claims 1 to 3, wherein the silicone elastomer is a vinyl dimethicone crosspolymer.

5. The cosmetic composition according to any one of claims 1 to 4, comprising 0.1 to 10% by weight of the particulate material.

6. The cosmetic composition according to any one of claims 1 to 5, comprising from 0.1 to 10% by weight of the silicone elastomer.

7. The cosmetic composition of any one of claims 1 to 6, wherein the fluid is a volatile liquid or a non-volatile liquid.

8. The cosmetic composition of claim 7, wherein the volatile liquid is water, cyclomethicone, or a cosmetically acceptable volatile solvent other than water.

9. The cosmetic composition of any one of claims 1 to 8, wherein the refractive index (n) is at 25 ℃ and a wavelength of 589nm_s) The water-insoluble material of 1.2 to 2.0 is an inorganic material.

10. The cosmetic composition of claim 9, wherein the inorganic material is an inorganic polymer or an inorganic polymer comprising one or more organic groups.

11. The cosmetic composition of claim 10, wherein the inorganic polymer comprises silica or silica modified with one or more organic groups.

12. The cosmetic composition of any one of claims 1 to 11, wherein the ratio of the refractive index of the core to the refractive index of the shell (n) at 25 ℃ and a wavelength of 589nm (n)_c/n_s) Is 0.7 to 1.2.

13. A method of obscuring surface imperfections of skin comprising the step of applying thereto a cosmetic composition according to any one of claims 1 to 12.

14. Use of a cosmetic composition according to any one of claims 1 to 12 for blurring surface imperfections of the skin.

Technical Field

The present invention relates to cosmetic compositions. More particularly, the present invention relates to compositions for obscuring or masking surface imperfections of the skin.

Background

Aging affects the appearance of the skin, which is often manifested as wrinkles, age spots, or general uneven skin tone. Shiny skin indicates that the skin is oily and people dislike when the skin becomes oily. People generally prefer dull or non-oily skin.

Consumers are constantly in need of newer and more efficacious cosmetic compositions, one of their needs being those compositions that can obscure or mask skin imperfections. In general, formulation scientists have relied on talc, silica, kaolin and other inorganic particulate materials having a high refractive index.

An alternative is to create a blurring effect. In this case, the incident light is distorted due to scattering (lens action). Certain ingredients may achieve this effect. Such components act as lenses, which bend and twist light in multiple directions.

WO15166459a1 (opalyya) discloses a skin care/cosmetic composition comprising microcapsules containing an encapsulated releasable material. The microcapsules comprise a friable solid core having two shells surrounding the core. The core is a material with high oil absorption, and optionally it is porous. The composition disclosed in this publication has no gritty feel (non-gritty).

WO08018046a2(P & G) discloses personal care compositions comprising emulsified silicone elastomers in an aqueous phase. The composition comprises about 5 to 100 μm core-shell particles. A solid core formed of a particulate material such as wax, mica, silica, silicate or alumina is coated with silicone. The composition provides improved appearance and feel to the skin of the user.

US2007179241A (opal) discloses a cosmetic composition comprising at least one silicone elastomer and at least one encapsulated pigment. Pigment (TiO)₂/ZnO) is greater than the refractive index of the encapsulating material (e.g., silicon dioxide). The use of the composition is suggested to obtain soft focus benefits.

WO15055416a1 (uniritua) discloses cosmetic compositions in the form of a paste, gel, liquid or monolithic solid and comprising a particulate active, wherein the particulate active comprises: a water-insoluble shell component comprising an inorganic material and having a refractive index of 1.3 to 1.8; and a core component comprising a volatile liquid and having a refractive index of at least 1.2, wherein the core component comprises at least 75% water by weight of the core component; and a cosmetically acceptable carrier comprising a hydrophobic material, wherein the hydrophobic material comprises less than 15% liquid oil by weight of the composition; and wherein the composition comprises 0.001 to 3 wt% of a yellow pigment. The composition provides a more durable optical benefit.

WO15055494a1 (uniritua) discloses a cosmetic composition comprising a particulate active and opacifying particles having a refractive index of at least 1.7. The particulate active comprises a water-insoluble shell comprising an inorganic material and having a refractive index of from 1.3 to 1.8. The core comprises a volatile liquid having a refractive index of at least 1.2.

WO2017071886A1 (Unilihua) discloses a personal composition comprising turbostratic boron nitride having a specific surface area of more than 300m²A porous silica in g and a silicone elastomer. The porousSilica is capable of absorbing large amounts of oil. The composition provides haze and brightness benefits.

WO2017220310a1 (unirita) discloses a personal care composition comprising retinol, porous silica and a silicone elastomer. The composition provides more stable retinol over long term storage as well as a blurring benefit.

WO 2016152872(Asahi Glass Company) discloses a cosmetic product comprising hollow silica particles having an average particle size of 0.1 to 30m, an outer shell thickness of 5 to 500nm, and an outer shell thickness of 0.5 to 20% of the average particle size. The cosmetic has high masking property.

In both of these documents mentioned immediately above, an index known as the L & W index is used to compare the efficacy of a given cosmetic composition with other cosmetic compositions. This index is proportional to performance.

Typically, formulation scientists will use elastomeric silicone particles to increase the index. However, in cosmetic compositions there is a significant limit to the amount of such particles, given their cost factors as well as the possibility of adverse secondary effects, such as instability and adverse effects on the tactile properties of the composition.

It has been determined that this problem can be solved by combining elastomeric silicone particles with a core-shell particulate active, wherein the core-shell particulate active comprises a water-insoluble shell having a refractive index of from 1.3 to 1.8 surrounding a core comprising a fluid having a refractive index of at least 1.0.

Generally, cosmetic compositions for surface blemishes do not provide skin lightening because it is believed that skin lightening and blurring are two distinct and mutually exclusive effects. However, the inventors have determined that under certain conditions the compositions of the invention can provide both effects simultaneously. Furthermore, in terms of L & W index, the effect does not disappear as quickly, but can tolerate some sebum on the skin. Thus, the effect is durable.

Disclosure of Invention

According to a first aspect, a cosmetic composition is disclosed, comprising:

(i) particulate material comprising a shell and a core, wherein the shell comprises a refractive index (n) at 25 ℃ and a wavelength of 589nm_s) 1.2 to 2.0, the core comprising a refractive index (n) at 25 ℃ and a wavelength of 589nm_c) A fluid of at least 1.0, wherein the particulate material has an oil absorption capacity of at least 300g/100g as measured by ASTM D281-95 by means of the blade abrasion method with linseed oil (Spatula Rub-out); and

(ii) a silicone elastomer having an average particle diameter of 0.1 to 100 μm.

Wherein the ratio of the amount of the particulate material to the amount of the particulate silicone elastomer is from 1:3.5 to 3.5:1 parts by weight.

In a second aspect, a method of obscuring surface imperfections of skin is disclosed comprising the step of applying thereto the cosmetic composition of the first aspect.

In a third aspect, the use of the cosmetic composition of the first aspect for blurring surface imperfections of the skin is disclosed.

In a fourth aspect, a method of lightening skin tone is disclosed comprising the step of applying thereto the cosmetic composition of the first aspect.

In a fifth aspect, the use of the cosmetic composition of the first aspect for lightening skin tone is disclosed.

All other aspects of the invention will be more readily understood upon consideration of the following detailed description and examples.

Definition of

As used herein, "cosmetic composition" is intended to include compositions for topical application to the skin of a mammal, particularly a human. Such compositions may be generally classified as leave-on or rinse-off, but are preferably leave-on. The compositions are formulated into products that are specifically intended for use by the human body to improve appearance, but may additionally provide cleaning, odor control, or overall aesthetics. The compositions of the present invention may be in the form of a liquid, emulsion, cream, foam, scrub, gel or toner, or may be applied with a vehicle or via a mask or pad. Non-limiting examples of such compositions include leave-on skin creams, antiperspirants, deodorants, lipsticks, foundations, mascaras, make-up milks, and sun screens. The composition of the present invention is preferably a leave-on composition. As used herein, "skin" is intended to include skin on the face and body (e.g., neck, chest, back, arms, underarms, hands, legs, buttocks, and scalp), particularly the portions thereof that are exposed to sunlight.

Refractive index

The refractive index values referred to herein are determined at 25 ℃ and a wavelength of 589 nm.

Particle size

Where reference is made to the size of the particles (other than the "primary particle size"), this refers to the number average diameter as determined, for example, using Scanning Electron Microscopy (SEM). Similarly, "thickness" refers to the number average thickness as determined, for example, using a Scanning Electron Microscope (SEM). In a preferred method, cryosem is used to determine particle size and thickness. In cryosem, the composition is snap frozen in liquid nitrogen and then cryo-planarization is performed to form a flat surface to be imaged. Typically, the diameter and thickness are each averaged over at least 200 particles. To determine the diameter, the whole particles were selected from the SEM image, while for the shell thickness, the sliced particles were selected.

If the particle is not spherical (e.g., elliptical or spheroidal), then "diameter" refers to the maximum distance measurable across the particle.

In the case of reference to primary particle size, this refers to the size (diameter) that can be measured by Transmission Electron Microscopy (TEM) using methods such as those described by S.Gu et al, Journal of colloid and Interface Science 289(2005), page 419-426.

Hydrophobic materials

"hydrophobic material" means a substance that is preferentially attracted to water at 25 ℃ and 1 atmosphere, and is readily dissolved therein by a non-polar solvent such as n-octanol. Preferred hydrophobic materials are insoluble in water. As used herein, the term "liquid oil" refers herein to a hydrophobic material having a melting point below 25 ℃ at 1 atmosphere. "non-liquid hydrophobic material" refers to a hydrophobic material other than a liquid oil. Preferred hydrophobic materials are non-volatile.

Solubility in water

As used herein, "soluble" and "insoluble" refer to the solubility of a substance in a solvent (which is water unless otherwise specified). Soluble refers to a material that dissolves in a solvent at room temperature (25 ℃) and room pressure (1 atmosphere) to give a solution having a concentration of at least 1 gram per liter. Insoluble refers to a material that dissolves in a solvent at room temperature and pressure to give a solution with a concentration of less than 1 gram per liter.

Volatility

As used herein, the term "volatile" refers to a substance having a vapor pressure of at least 1000Pa at 25 ℃, and a non-volatile substance is a substance having such a vapor pressure of less than 1000 Pa.

Leave-on and rinse-off formulations

As used herein with respect to compositions, the term "leave-on" refers to compositions that are applied to or rubbed onto the skin and left on. Examples include creams and emulsions.

As used herein with respect to compositions, the term "rinse-off" refers to a skin cleanser that is applied to or rubbed onto the skin and thoroughly rinsed off immediately after application. An example is a shower gel.

Others

Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and/or use may optionally be understood as modified by the word "about".

All amounts are by weight of the final composition, unless otherwise specified.

As used herein, the term "solid" means that the material is not fluid at 25 ℃.

It should be noted that in specifying any range of values, a given upper value can be associated with any lower value.

For the avoidance of doubt, the word "comprising" is intended to mean "including", but not necessarily "consisting of … …" or "consisting of … …". In other words, the listed steps or options need not be exhaustive.

The disclosure of the invention as set forth herein is to be considered to cover all embodiments as set forth in the claims as being multiply dependent upon one another, irrespective of the fact that claims may be found without multiple dependencies and redundancies.

Where a feature is disclosed with respect to a particular aspect of the invention (e.g., a composition of the invention), such disclosure should also be considered as applying to any other aspect of the invention (e.g., a method of the invention) mutatis mutandis.

Detailed Description

Granular material

The cosmetic composition according to the present invention comprises a particulate material. The material comprises a shell and a core.

The core comprises a refractive index (n)_c) Is at least 1.0 fluid. Preferably, the fluid is air or a volatile or non-volatile liquid. Preferably, the non-volatile liquid is an emollient (emollient). Alternatively, the core consists essentially of a fluid. Further preferably, the core consists of a fluid. A particularly preferred volatile liquid is water. Alternatively, it is preferred that the volatile liquid is a volatile silicone such as D5 or C_1-5An alcohol. Alternatively, the liquid is less volatile, otherwise it may escape from the core prematurely. Preferably the core comprises at least 50% water, more preferably at least 75%, even more preferably at least 85%, most preferably 90-100% water. The liquid is volatile so that when the particulate material is exposed to air at 25 ℃ and 1 atmosphere, the liquid can evaporate from the core. This occurs when the composition is applied to the skin. Preferably, the vapour pressure of the volatile liquid is at least 2kPa, most preferably at least 2.5kPa at 25 ℃. Further preferably, the vapour pressure of the volatile liquid is less than 50kPa, more preferably less than 15kPa, at 25 ℃.

Preferably, the refractive index (n) of the core_c) From 1.0 to 1.8, more preferably from 1.25 to 1.5, and most preferably from 1.3 to 1.45. Preferably, the fluid is a volatile liquidHair liquids or non-volatile liquids. Preferably, the volatile liquid is water, cyclomethicone, or a cosmetically acceptable volatile solvent other than water. A particularly preferred volatile solvent is C_2-3An alcohol. When the fluid is non-volatile, it is preferably an emollient. Emollients are widely used in cosmetics for the care and protection of the skin. Emollients are materials used to prevent or alleviate dryness.

Preferably, the emollient is a non-hydrocarbon emollient. As used herein, hydrocarbon refers to an organic compound consisting entirely of hydrogen and carbon. Preferably, the non-hydrocarbon emollient is C_10-20Alkenyl or alkyl esters of fatty acids, ether-esters, polyol esters, wax esters, monoglycerides, diglycerides or triglycerides, sterol esters, fatty alcohols, fatty acids, lanolin or derivatives, wax esters, phospholipids, beeswax or sterols.

More preferably, the non-hydrocarbon emollient is a triglyceride. Further preferably, the triglyceride is one or more of the following: wheat germ oil, apricot kernel oil, avocado oil, sunflower seed oil, arnica oil, evening primrose oil, jojoba oil, coconut oil, palm kernel oil, peanut oil, safflower oil, cottonseed oil, rapeseed oil, palm oil, almond oil, rice bran oil, cocoa butter or castor oil.

Alternatively, the emollient is a hydrocarbon emollient. Suitable examples include cyclic hydrocarbons, straight chain aliphatic hydrocarbons (saturated or unsaturated), and branched chain aliphatic hydrocarbons (saturated or unsaturated). Illustrative examples include mineral oil, wax, and petrolatum (e.g., petrolatum).

When the cosmetic composition is applied to the skin, the fluid escapes from the core. If the fluid is a volatile liquid, it will evaporate. When the liquid is an emollient, it is absorbed by the skin, which may occur more quickly or for a period of time depending on the nature of the emollient. Thereafter, the fluid in the core is replaced by air. When this occurs, the refractive index of the shell exceeds that of the core (air refractive index is 1).

The shell comprises a refractive index (n)_s) 1.2 to 2.0 of a water-insoluble material. Preferably, the refractive index (n)_s) Is 1.3 to 1.8. Preferably, the water-insoluble material has a refractive index of 1.2 to 2.0The material is an inorganic material. More preferably, it is an inorganic polymer or an inorganic polymer comprising one or more organic groups. Further preferably, the inorganic polymer is obtained by a sol-gel process. It is further preferred that the inorganic polymer comprises silica or silica modified with one or more organic groups. Such polymers may be formed into shell-like particles using, for example, the process described in US7758888B 1. Preferably, the shell comprises at least 80%, more preferably at least 90%, most preferably 95% to 100% by weight of inorganic material.

Without wishing to be bound by theory, it is believed that as a fluid, such as a volatile liquid, evaporates from the core (e.g., after application to the skin), it is replaced by air. The refractive index of air is lower compared to that of the shell, which results in a difference in the relative refractive indices of the core and the shell. This in turn allows the particles to allow more light to achieve light scattering and allows the overall optical benefit provided by the composition to develop over time after application.

The shell comprises a water-insoluble material, but preferably the shell is permeable to fluid. Preferably, the shell is sufficiently permeable to allow the fluid to evaporate or be released and absorbed by the skin when the particulate material is exposed to air at 25 ℃ and 1 atmosphere. Most preferably, the shell is sufficiently permeable to enable substantially all of the fluid (e.g., 90-100% by weight of the total fluid in the core) to evaporate or be released from the interior.

The refractive index of the water-insoluble material is 1.2 to 2.0, more preferably 1.3 to 1.8, further preferably 1.4 to 1.7, and most preferably 1.5 to 1.6. 1.6

Preferably, the ratio of the refractive index of the core to the refractive index of the shell (n)_c/n_s) From 0.7 to 1.2, more preferably from 0.8 to 1.1, most preferably from 0.85 to 1.0.

It was observed that if the particulate material is micronized, it is better able to scatter light. Therefore, it is preferable that the particle diameter (D) of the particulate material is 0.1 to 2 μm, more preferably 0.2 to 1.2. mu.m.

Granular materials with thicker shells provide particularly good optical effects. Therefore, it is preferred that the relation between the thickness (L) of the shell and the size (D) of the granular material follows equation (I) given below:

L≥150nm–0.25×D

preferably, the particles of the particulate material are spherical or spheroidal, more preferably spheroidal.

Further preferably, each particle consists of or consists essentially of a single core encapsulated by a single shell.

The composition of the invention preferably comprises from 0.1 to 10 wt%, more preferably from 0.1 to 6 wt%, even more preferably from 0.2 to 4 wt% of the particulate material. Most preferably in an amount of from 0.5 to 2.5% by weight of the composition.

The particulate material has an oil absorption capacity of at least 300g/100 g. The total oil absorption of the granular material is measured according to astm d281-95 by means of the scraper abrasion method using linseed oil.

Particulate silicone elastomers

As used herein, "silicone elastomer" refers to a deformable organopolysiloxane having viscoelastic properties.

Preferably, the silicone elastomer is crosslinked. The silicone elastomer may be obtained from a curable organopolysiloxane. Examples of this are: an addition reaction-curing organopolysiloxane composition that cures under platinum metal catalysis by an addition reaction between an SiH-containing diorganopolysiloxane and an organopolysiloxane having silicon-bonded vinyl groups; a condensation-cured organopolysiloxane composition that cures in the presence of an organotin compound by a dehydrogenation reaction between a hydroxyl-terminated diorganopolysiloxane and an SiH-containing diorganopolysiloxane; condensation-curing organopolysiloxane compositions that cure in the presence of organotin compounds or titanates by a condensation reaction between a hydroxyl-terminated diorganopolysiloxane and a hydrolyzable organosilane (this condensation reaction is exemplified by dehydration, alcohol release, oxime release, amine release, amide release, carboxyl release, and ketone release reactions); a peroxide-curing organopolysiloxane composition that is thermally cured in the presence of an organic peroxide catalyst; and organopolysiloxane compositions which are cured by high-energy radiation, for example by gamma radiation, ultraviolet radiation or electron beams. The silicone elastomer is preferably obtained by addition reaction-curing an organopolysiloxane composition which is cured under platinum metal catalysis by an addition reaction between an SiH-containing diorganopolysiloxane and an organopolysiloxane having silicon-bonded vinyl groups.

The silicone elastomer may be an emulsified or non-emulsified crosslinked silicone elastomer or a combination thereof, but preferably the silicone elastomer is non-emulsified. As used herein, the term "non-emulsifying" defines a crosslinked silicone elastomer in the absence of polyoxyalkylene units. As used herein, the term "emulsifying" refers to a crosslinked organopolysiloxane elastomer having at least one polyoxyalkylene (e.g., polyethylene oxide or polypropylene oxide) unit.

Preferred silicone elastomers are organopolysiloxanes available under the INCI designation of dimethicone (dimethicone)/vinyl dimethicone crosspolymer, and polysiloxane-11. More preferably, the silicone elastomer is a dimethicone/vinyl dimethicone crosspolymer.

A suitable elastomer commonly used is DC9509 (63% solids) dimethicone/vinyl dimethicone crosspolymer (and) C12-14 Pareth-12. DOW CORNING 9509 Silicone elastomer suspension is a 63% nonionic suspension of spherical silicone elastomer powder in water. Representative of such materials are: polydimethylsiloxane/vinyl polydimethylsiloxane crosspolymers and polydimethylsiloxane crosspolymers, which are commercially available from a number of suppliers, include: dow Corning (9040, 9041, 9045, 9506, and 9509), General Electric (SFE 839), Shin Etsu (KSG-15, 16, and 18[ dimethicone/phenyl vinyl dimethicone crosspolymer ]), and Grant industries (Gransil brand materials)), and lauryl dimethicone/vinyl dimethicone crosspolymers supplied by Shin Etsu (e.g., KSG-31, KSG-32, KSG-41, KSG-42, KSG-43, and KSG-44). The reference to solids content shows that when, for example, 10g of the material is metered into a given formulation, the effective amount of elastomer metered in is 6.3 g.

The silicone elastomer has an average particle diameter of 0.1 to 100. mu.m. For example, silicone elastomers from Dow CorningThe average particle diameter of (a) is the particle size D50 tested by Horiba LA-500. Preferably, the particles of silicone elastomer are spherical or spheroidal. Preferably, the compositions of the present invention comprise from 0.1 to 10% by weight, more preferably from 0.5 to 8% by weight, even more preferably from 1 to 5% by weight of silicone elastomer.

In the composition according to the invention, the ratio of the amount of particulate material to the amount of particulate silicone elastomer is from 1:3.5 to 3.5:1 parts by weight. For the sake of further clarity, it is clear that reference to the amount of silicone elastomer is based on its actual/effective amount, without regard to solvents or other carrier ingredients typically present in commercially available silicone elastomers.

This ratio allows the formulation of cosmetic compositions with adjustable whitening efficacy, which can be increased or decreased by adjusting the ratio of the two components, depending on the ratio, to achieve a whitening effect or no (or less) whitening effect, according to the judgment of the formulation scientist. In addition, the composition also provides an L & W index as previously described/defined, which indicates the ability of the composition to obscure/mask surface imperfections of the skin.

Other ingredients

The composition of the present invention may additionally comprise opacifying particles. These particles are particles having a very high refractive index, i.e. having a refractive index of at least 1.7. For example, the refractive index of the light-shielding particles may be greater than 1.8, more preferably greater than 1.9, and most preferably from 2.0 to 2.7. Examples of such opacifying particles are those comprising bismuth oxychloride, boron nitride, titanium dioxide, zirconium oxide, aluminum oxide, zinc oxide, or a combination thereof. More preferred are opacifying particles comprising zinc oxide, zirconium oxide, titanium dioxide, or a combination thereof, because these materials have a relatively high refractive index. Most preferred are opacifying particles comprising titanium dioxide. Preferably, the composition comprises 0.001 to 10 wt%, more preferably 0.01 to 7 wt% of opacifying particles.

Preferably, when present, the opacifying particles are micronized. Preferably, the primary particle size is from 20 to 2000nm, more preferably from 25 to 900nm, and most preferably from 30 to 400 nm.

Opacifying particles are not the same as granular materials. The light-screening particles are generally blended into the composition at a lower content because the light-screening ability is more excellent.

In addition, the compositions of the present invention may also contain yellow pigments to provide appearance benefits to the skin. Sometimes, the opacity imparted to the skin by the particulate active may appear as uneven "patches", and yellow pigments may ameliorate this problem.

Preferably, the composition comprises from 0.001 to 3 wt%, more preferably from 0.01 to 2.5 wt%, still more preferably from 0.05 to 2 wt% of the yellow pigment. Preferably, the yellow pigment is a metal oxide. Suitable metal oxides include titanium dioxide, iron oxide or stannous oxide. Alternatively, the yellow pigment is of organic origin. Commercially available Yellow pigments include BGYO-TTB2 (available from Kobo Product Inc. of the United states), SI2Yellow LLXLO (available from Daito Kasei Kogyo Company of Japan), Bronze 43737 (available from Sudarshan Chemicals of India), Tarrazine Yellow (available from Davarson of India), turmeric extract, or mixtures thereof. Most preferred is iron oxide having color index build number (c.i.) 77492.

The preferred metal oxide is yellow iron oxide. Preferably, the iron oxide is coated or encapsulated so as to minimize interaction with other ingredients of the composition. For example, when organic sunscreen agents are present in the formulation such as1789 butyl methoxydibenzoylmethane, sold by Givaudan, may interact with iron oxide and produce an undesirable red color. To minimize this interaction, the metal oxide is coated with a material such as mica and/or silicone. An example of a coated yellow iron oxide is BGYO-TTB2, having a composition such asThe following i.n.c.i. names: iron oxide (c.i.77492) (and) titanium isopropyltriisostearate (and) triethoxysilylethyldimethylsiloxyethylpolydimethylsiloxane.

The compositions of the present invention preferably further comprise a cosmetically acceptable carrier. Preferably, the carrier comprises a significant amount of refractive index (n)_c) At least 1.0 fluid.

Thus, preferably the carrier comprises a volatile liquid or a non-volatile liquid. In one aspect, the carrier is a water-in-oil emulsion. Alternatively, the carrier is an oil-in-water emulsion. When the carrier is any of the emulsions described, it is preferred that the particulate material is pre-dispersed in the continuous phase to minimise interaction of the particulate active with any liquids that may be present in the composition.

Preferably, the carrier comprises silicone.

Silicones can be divided into volatile and non-volatile categories. The volatile silicone oil (if used) is preferably selected from cyclic (cyclomethicone) or linear polydimethylsiloxanes containing from 3 to 9, preferably from 4 to 5, silicon atoms.

Non-volatile silicones useful as emollients include polyalkylsiloxanes, polyalkylarylsiloxanes, and polyether siloxane copolymers the substantially non-volatile polyalkylsiloxanes useful herein include, for example, those having a viscosity of about 5 × 10 at 25 deg.C^-6To 0.1m²Among the preferred non-volatile emollients, useful in the compositions of the present invention are those having a viscosity of about 1 × 10 at 25℃^-sm²S to about 4 × 10^-4m²Polydimethylsiloxane/s.

Specific examples of non-silicone emollients include stearyl alcohol, glyceryl monoricinoleate, mink oil, cetyl alcohol, isopropyl isostearate, stearic acid, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecyl-2-ol, isocetyl alcohol, eicosanyl alcohol, behenyl alcohol, cetyl palmitate, silicone oils such as dimethylpolysiloxane, di-n-butyl sebacate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cottonseed oil, olive oil, palm kernel oil, rapeseed oil, safflower seed oil, evening primrose oil, soybean oil, sunflower seed oil, avocado oil, sesame seed oil, coconut oil, peanut oil, castor oil, acetylated lanolin alcohols, petrolatum, mineral oil, butyl myristate, Isostearic acid, palmitic acid, isopropyl linoleate, lauryl lactate, myristyl lactate, decyl oleate, myristyl myristate, and mixtures thereof.

Among the ester emollients are:

(a) alkenyl or alkyl esters of fatty acids having 10 to 20 carbon atoms. Examples thereof include isoarachidylester pivalate, isodecyl pivalate, isononyl isononanoate, cetyl ricinoleate, oleyl myristate, oleyl stearate, and oleyl oleate;

(b) ether esters, such as fatty acid esters of ethoxylated fatty alcohols;

(c) a polyol ester. Butylene glycol, ethylene glycol mono-and di-fatty acid esters, diethylene glycol mono-and di-fatty acid esters, polyethylene glycol (200-) 6000) mono-and di-fatty acid esters, propylene glycol mono-and di-fatty acid esters, polypropylene glycol 2000 monooleate, polypropylene glycol 2000 monostearate, ethoxylated propylene glycol monostearate, glyceryl mono-and di-fatty acid esters, polyglycerol poly-fatty esters, ethoxylated glycerol monostearate, 1, 3-butylene glycol distearate, polyoxyethylene polyol fatty acid ester, sorbitan fatty acid esters, and polyoxyethylene sorbitan fatty acid esters are satisfactory polyhydric alcohol esters. Particularly useful are the esters of pentaerythritol, trimethylolpropane and neopentyl glycol of C1-C30 alcohols. Exemplary are pentaerythritol tetraethylhexanoate;

(d) wax esters, such as beeswax, spermaceti and behenic acid methyl ester wax (tribehenin wax);

(e) sterol esters, of which cholesterol fatty acid esters are examples;

(f) sugar esters of fatty acids, such as sucrose polybehenate and sucrose polycottonseed oil; or

(g) A mixture of two or more of the above (a) to (f).

Can also be used in particular toTrade mark sold C_12-15Alkyl benzoates.

Hydrocarbons as suitable emollients include petrolatum, mineral oil, C_11-C13Isoparaffins, poly α -olefins, isohexadecane, or mixtures thereof.

Alternatively, the carrier comprises 1 to 25 wt% fatty acid or 0.1 to 80 wt% soap, based on the weight of the composition. Mixtures of fatty acids with soaps are also suitable, for example to form vanishing cream bases, which give the skin a matte feel. Particularly preferred is C_12-20Fatty acids, more preferably C_14-18A fatty acid. The most preferred fatty acids are stearic acid, myristic acid or mixtures thereof. When present, the composition comprises 5-20 wt% fatty acid or soap. The soap in the hydrophobic material may comprise an alkali metal salt of a fatty acid, for example a sodium or potassium salt, most preferably potassium stearate. Typically, the vanishing cream base in cosmetic compositions is prepared by taking the desired amount of total fatty matter and mixing with the desired amount of potassium hydroxide. The soap is typically formed in situ during mixing.

Preferably, the carrier comprises water. For example, the amount of water may range from 1 to 85%, more preferably from 5 to 90%, even more preferably from 35 to 80%, optimally between 40 and 70% by weight of the cosmetic composition, depending on the nature of the composition.

Further preferably, the composition of the present invention comprises a skin lightening agent. The skin lightening agent is preferably selected from one or more of the following: vitamin B3 compound or its derivative, such as nicotinic acid, nicotinic acid or nicotinamide or other known skin lightening agents, such as adapalene, aloe vera extract, ammonium lactate, anethole derivative, apple extract, arbutin, azelaic acid, kojic acid, bamboo extract, bearberry extract, bletilla striata tuber, Bupleurum extract, sanguisorba extract, butylated hydroxyanisole, butylated hydroxytoluene, citrate, Ligusticum wallichii, Angelica sinensis, deoxyarbutin, 1, 3-diphenylpropane derivatives, 2, 5-dihydroxybenzoic acid and its derivatives, 2- (4-acetoxyphenyl) -1, 3-zineb, 2- (4-hydroxyphenyl) -1, 3-zineb, ellagic acid, escinol, cryptoxanthin derivatives, fade (pentaharmm), ledebouriella root, fennel extract, or other known skin lightening agents, Ganoderma extract, Ligusticum sinense, Gartlefosse (Gattlefosse), genetic acid and its derivatives, glabridin and its derivatives, glucopyranosyl-1-ascorbate, gluconic acid, glycolic acid, green tea extract, 4-hydroxy-5-methyl-3 [2H ] -furanone, hydroquinone, 4-hydroxyanisole and its derivatives, 4-hydroxybenzoic acid derivatives, hydroxyoctanoic acid, inositol ascorbate, lemon extract, linoleic acid, magnesium ascorbyl phosphate, melaleum (Pentapharm), mulberry extract, mulberry root extract, 5-octanoylsalicylic acid, parsley extract, Phellinus linteus extract, pyrogallol derivative, 2, 4-resorcinol derivative, 3, 5-resorcinol derivative, rose hip extract, salicylic acid, Song-Yi extract, 3,4, 5-trihydroxybenzyl derivatives, tranexamic acid, vitamins such as vitamin B6, vitamin B12, vitamin C, vitamin A, dicarboxylic acid, resorcinol derivatives, extracts of plants of Rubia and Symplocos, hydroxycarboxylic acids such as lactic acid, and their salts, such as sodium lactate, and their mixtures. Vitamin B3 compound or its derivatives such as niacin, or niacinamide are more preferred skin lightening agents according to the invention, with niacinamide being most preferred. Nicotinamide is preferably used in an amount of 0.1 to 10% by weight, more preferably 0.2 to 5% by weight.

The composition may further preferably comprise one or more organic sunscreen agents. A variety of organic sunscreens are suitable for use in combination with the essential ingredients of the present invention. Suitable UV-A/UV-B sunscreens include: 2-hydroxy-4-methoxybenzophenone, octyldimethyl-p-aminobenzoic acid, digallacyl trioleate, 2-dihydroxy-4-methoxybenzophenone, ethyl-4- (bis (hydroxypropyl)) aminobenzoate, 2-ethylhexyl-2-cyano-3, 3-diphenylacrylate, 2-ethylhexyl salicylate, glycerol p-aminobenzoate, 3, 5-trimethylcyclohexyl salicylate, methyl anthranilate, p-dimethyl-aminobenzoic acid or aminobenzoate, 2-ethylhexyl-p-dimethyl-amino-benzoate, 2-phenylbenzimidazole-5-sulfonic acid, 2- (p-dimethylaminophenyl) -5-sulfonic acid benzoxazole, 2-ethylhexyl-p-methoxycinnamate, butyl methoxydibenzoylmethane, 2-hydroxy-4-methoxybenzophenone, octyldimethyl-p-aminobenzoic acid and mixtures thereof. The most suitable organic sunscreens are 2-ethylhexyl-p-methoxycinnamate, butyl methoxydibenzoylmethane or mixtures thereof.

A safe and effective amount of organic sunscreen agent is 0.1 to 10% by weight of the organic sunscreen agent, more preferably 0.1 to 5% by weight.

Other materials that may be included in the cosmetically acceptable carrier include humectants, thickeners, and powders. Examples of each of these types of materials that can be used alone or as mixtures are as follows:

humectants include those of the polyhydric alcohol type. Typical polyhydric alcohols include polyalkylene glycols and more preferably alkylene polyols and their derivatives, including propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol and derivatives thereof, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1, 3-butylene glycol, isoprene glycol, 1,2, 6-hexanetriol, glycerol, ethoxylated glycerol, propoxylated glycerol and mixtures thereof. The amount of humectant may be anywhere in the range of, for example, 0.5% to 50%, more preferably between 1% and 15%, by weight of the composition. Most preferred is glycerol (also known as glycerin). The amount of glycerol may be, for example, from 0.5% to 50%, more preferably from 1% to 35%, optimally from 2% to 15% by weight of the composition.

A wide variety of thickeners may be included in the composition. Illustrative but not limiting of this are stearic acid, acrylamide/sodium acryloyldimethyl taurate copolymersHydroxyethyl acrylate/sodium acryloyldimethyl taurate copolymer, aluminum starch octenyl succinate, polyacrylate (e.g. carbomers, includingAndthickeners), polysaccharides (including xanthan, guar, pectin, carrageenan, and sclerotium gum), celluloses (including carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and methyl hydroxymethyl cellulose), minerals (including talc, silica, alumina, mica, and clays, the latter being represented by bentonite, hectorite, and attapulgite), magnesium aluminum silicate, and mixtures thereof. The amount of thickener may be, for example, from 0.05 to 10% by weight, more preferably from 0.3 to 2% by weight, based on the weight of the composition.

Powders include chalk, talc, fullers earth, kaolin, starch, gums, colloidal silica sodium polyacrylate, tetraalkyl and/or trialkyl aryl ammonium montmorillonite, chemically modified magnesium aluminium silicate, organically modified montmorillonite clay, hydrated aluminium silicate, fumed silica, carboxyvinyl polymer, sodium carboxymethylcellulose and ethylene glycol monostearate.

The compositions may be formulated in any known form, more preferred forms being creams and emulsions. The cosmetic composition of the present invention may further comprise other ingredients commonly used in the art to enhance physical properties and performance. Suitable ingredients include, but are not limited to: binders, colorants and pigments, pH adjusters, preservatives, optical agents, fragrances, viscosity modifiers, biological additives, buffers, conditioning agents, natural extracts, essential oils, and skin benefit agents, including anti-inflammatory agents, cooling agents, antiperspirants, anti-aging agents, anti-acne agents, antimicrobial agents, and antioxidants.

The cosmetic compositions of the present invention are compositions suitable for topical application to human skin, including leave-on and rinse-off products. Preferably, the compositions of the present invention are leave-on compositions.

The composition may be suitably packaged in suitably sized packages or dispensers. The package may be a can or tube, but also any other form commonly used for cosmetic, cream, washing and emulsion type products. The composition may be applied topically, and preferably 1 to 4 milligrams of the composition per square centimeter of skin.

Method and use

In a second aspect, a method of obscuring surface imperfections of skin is disclosed comprising the step of applying thereto the cosmetic composition of the first aspect. Preferably, the method is non-therapeutic in nature. Non-therapeutic in nature means for cosmetic purposes. Alternatively, it is for therapeutic purposes.

In a third aspect, the use of the cosmetic composition of the first aspect to blur surface imperfections of the skin is disclosed. Examples include: reducing fine lines, wrinkles, pores and/or spots; making the skin color modulation uniform; or a combination thereof.

In a fourth aspect, a method of lightening skin tone is disclosed comprising the step of applying thereto the cosmetic composition of the first aspect.

In a fifth aspect, the use of the cosmetic composition of the first aspect for lightening skin tone is disclosed.

The following examples are provided to facilitate an understanding of the present invention. These examples are not intended to limit the scope of the claims.

Detailed Description