HK1130678B - Cosmetic compositions with encapsulated pigments and a method for using - Google Patents

Description

Cosmetic compositions with encapsulated pigments and methods of use thereof

Background

1. Field of the invention

The present invention relates to cosmetic compositions with encapsulated pigments. The invention further relates to a method of imparting a cosmetic effect on a topical surface.

2. Description of the related Art

Cosmetic compositions often use pigments as masking agents to enhance the appearance inherent to the composition and/or to impart a particular appearance upon topical application.

Pigmented cosmetic compositions often impart an opaque artificial appearance to the skin. The opaque artificial appearance is caused by the difference in refractive index between the pigment and the skin. Pigments typically exhibit a refractive index in excess of 2. Skin, on the other hand, typically exhibits a refractive index of about 1.4 to 1.5.

One approach used in the cosmetic arts to create a less transparent and more natural-like appearance is to incorporate pearlescent agents in place of pigments. However, pearlescent agents are relatively expensive and oftentimes provide an artificial appearance to the skin. Therefore, it is desirable to minimize their use.

It would be desirable to have a pigmented cosmetic composition that imparts a less transparent appearance, i.e., a more translucent and more natural look.

Summary of The Invention

It is an object of the present invention to provide a pigmented cosmetic composition that is less transparent and more natural-like.

In accordance with these and other objects of the present invention, a pigmented cosmetic composition is provided. The composition comprises a cosmetically acceptable carrier, an active ingredient, and a plurality of encapsulated pigment particles. The particles consist of the encapsulant and entrapped pigment within the encapsulant. The encapsulant contains silicon dioxide (silica) and exhibits a refractive index of about 1.4 to about 1.6.

Detailed Description

It has surprisingly been found that there will be a more opaque and more natural-like pigmented cosmetic composition. It has further been surprisingly found that there will be a method of imparting a cosmetic effect to a topical surface.

The cosmetic composition contains a plurality of encapsulated pigment particles therein to impart a visual effect of color to the composition itself and/or upon topical application to a topical surface. The visual effect is less transparent and more natural-looking than a composition containing non-encapsulated pigment particles.

The encapsulated pigment particles consist of a sealant and encapsulated pigment particles within the sealant. The encapsulant covers substantially the entire surface of the pigment particles and takes the form of a coating or layer.

The encapsulated pigment particles give a less transparent and more natural-like appearance because they have a different refractive index than the pigment particles alone (which are not encapsulated). Silica, the substance predominantly present in the encapsulant, exhibits a refractive index of about 1.4 to about 1.6, which is comparable to that of skin.

The composition contains one or more pigments therein. Useful pigments include any known in the cosmetic art. Examples of useful pigments include titanium dioxide, zinc oxide, iron oxide, chromium oxide, ferric blue (ferric blue), carbon black, mica, manganese violet, ultramarine and combinations thereof. The pigment may be of any shape, although spherical shapes are preferred. Preferably, the average particle size is about 10 microns or less, and more preferably the size is about 1 micron or less.

The pigment is present in the composition in an amount of from 1 wt% to about 25 wt%, based on the total weight of the composition, preferably in an amount of from about 1 wt% to about 15 wt%, based on the total weight of the composition.

By sealant is meant a covering or overlay that encapsulates or encapsulates the pigment. The encapsulant substantially prevents direct contact or contact between the pigment and the larger composition. The encapsulant consists essentially of silica, although small amounts, i.e., less than 10 wt% (based on total composition weight) of other materials are possible so long as the desired degree of refraction, i.e., refractive index of about 1.4 to about 1.6, is maintained.

If the average thickness of the encapsulant is too thin, some regions of the particles may remain exposed and unencapsulated. If the average thickness of the sealant is too thick, the color of the pigment will be diminished and skin coverage will be compromised.

The amount of encapsulant used to encapsulate the pigment particles is functionally a level that provides the encapsulated pigment particles of the present invention with a refractive index approximating that of skin, i.e., a refractive index of about 1.4 to 1.6. Generally, the sealant used is from about 1 to about 20 weight percent, preferably from about 3 to about 12 weight percent of the total weight of the encapsulated pigment particles.

Because the encapsulated pigment particles have a more transparent and more natural-looking appearance, they can replace all or part of the more expensive pearlescent agents often found in prior art cosmetic compositions.

The pigment may be encapsulated with silicon dioxide (silica) by any method known in the art. For example, a sol-gel glass process may be used to provide a coating of silica on the core pigment particles. In this method, a silica precursor is reacted in a series of hydrolysis and polymerization reactions to form a colloidal suspension, or sol, which is then precipitated onto a pigment core to provide a thin film coating of silica on the core pigment particles. See Brinker and Scherer, The Physicand Chemistry of Sol-Gel Processing (1990). Mention may also be made of U.S. patent No.3,410,708; 3,437,502, respectively; 3,591,398, respectively; and 4,199,370, which discloses a method for providing a silica coating by using aqueous sodium silicate and pH adjustment, commonly referred to in the art as the sol-gel method. The above-mentioned texts and patents are incorporated herein by reference.

The active ingredient may take the form of any compound that imparts a cosmetic, functional and/or medicinal effect or improves the aesthetic appearance of the topical surface. Representative compounds include the following: but are not limited to, anesthetics, anti-allergic agents, antifungal agents, screening agents, botanical extracts, chelating agents, depigmenting agents, detergents/cleansers, wrinkle-reducing agents, emollients, exfoliants, film formers, solidifying agents, fragrances, humectants, insect repellents, lubricants, moisturizers, medicaments, colorants, preservatives, skin protectants, skin permeation enhancers, stabilizers, sunscreens, surfactants, thickeners, vitamins and any combination thereof.

The compositions contain an active ingredient in an amount sufficient to impart a cosmetic/functional/medicinal effect (collectively referred to as a cosmetic effect) to the topical surface. The content can vary considerably depending on the type of effect desired and the nature of the active ingredient. The active ingredient is typically present in an amount of about 0.001 to about 95 wt%, more typically in an amount of about 0.001 to about 50 wt%, and most typically in an amount of about 0.001 to about 25 wt%, based on the total weight of the topical composition.

The composition may be in the form of any product known in the art. Useful product forms include solutions, lotions, pastes, loose powders, pressed powders, creams, sticks, gels, mousses, masks, beads and pomades. The composition may be aqueous or non-aqueous. The composition may take the form of a solution, dispersion, suspension or emulsion. The emulsion may be, for example, oil/water, water/oil, silicone/water, water/silicone, wax/water or water/wax.

The compositions may employ various cosmetically acceptable vehicles or carriers. Useful media include, but are not limited to, water, lower alcohols, polyols, fatty acids, fatty alcohols, fatty ethers, fatty esters,C₁₀to C₂₄Alkanes, volatile and non-volatile and linear and cyclic siloxanes, and combinations thereof.

In another aspect of the invention, the composition may be applied to any topical surface to impart a desired cosmetic effect thereto. Useful topical surfaces include skin, hair, lips and toes/nails. All skin areas, such as hands and face, can be treated. The composition may be applied frequently and/or as desired or desired. For example, the composition may be administered once or more times per day for only one day, one week or more, or two weeks or more.

The following are examples of the present invention. All parts, percentages and ratios are by weight unless otherwise indicated below.

Examples

Example 1: foundation liquid-oil-in-water type

Phase A:

63.2% demineralized water

0.7% magnesium aluminum silicate

0.1% xanthan gum

0.3% of methylparaben

0.1% tetrasodium EDTA

7.0% butanediol

Phase B:

7.0% titanium dioxide-Encapsulated in silica

1.0% iron oxide-yellow-encapsulated in silica

0.5% cosmetic iron pellet-encapsulated in silica

0.1% iron oxide-black-encapsulated in silica

2.0% silica 2-20 Micro Sphere Mss 5

Phase C:

1.0% stearyl polyoxyethylene (21) ether

4.0% ethylhexyl palmitate

0.5% stearyl polyoxyethylene (2) ether

0.5% glyceryl monostearate

7.0% mineral oil

5.0% of phenyl trimethicone

----------

100.0％

The preparation process comprises the following steps:

1. phase A was premixed in a homogenizer at 70 ℃.

2. Add phase B and mix at high speed in homogenizer.

3. Phase C was premixed and heated to 70 ℃.

4. Add phase C to phase AB in a 70 ℃ homogenizer.

5. Cooled to 30 ℃.

The use method comprises the following steps:

the fingertips are applied evenly to cover the blemishes, to even out the skin tone, and to provide a natural make-up.

Example 2: liquid foundation-water in silicone

Phase A:

1.0% cetyl dimethicone copolyol

5.0% of phenyl trimethicone

20.0% Cyclomethylsiloxane pentamer

1.0% PEG/PPG-18/18 Dimethicone

Phase B:

8.0% titanium dioxide-Encapsulated in silica

1.4% iron oxide-yellow-encapsulated in silica

0.4% cosmetic red lead-encapsulated in silica

0.2% iron oxide-black-encapsulated in silica

1.0% nylon powder-spherical

Phase C:

59.5% of softened water

2.0% of butanediol

1.0% sodium chloride

0.2% of methylparaben

0.3% imidazolidinyl urea

----------

100.0％

The preparation process comprises the following steps:

1. phase a was premixed in a homogenizer at room temperature.

2. Add phase B and mix at high speed in homogenizer.

3. Phase C was premixed and heated to dissolve the solids and cooled to room temperature.

4. Phase C was added to phase AB in the homogenizer.

The use method comprises the following steps:

the fingertips are applied evenly to cover the blemishes, to even out the skin tone, and to provide a natural make-up.

Example 3: make-up base cream to base powder

Phase A:

45.2% mineral oil

14.0% diisopropyl dimer linoleate

8.0% carnauba wax

5.0% beeswax

3.0% glyceryl tribehenate

6.0% ethylhexyl-methoxycinnamate

2.0% cetyl ricinoleate

0.2% propyl p-hydroxybenzoate

Phase B:

5.0% nylon powder-superfine

2.0% mica

6.6% titanium dioxide-Encapsulated in silica

2.0% iron oxide-yellow-encapsulated in silica

0.7% iron oxide-red-encapsulated in silica

0.3% iron oxide-black-encapsulated in silica

----------

100.0％

The preparation process comprises the following steps:

1. premix phase A with a propeller mixer at 70 ℃.

2. Add phase B and mix at high speed in homogenizer.

3. Poured into a pan at 60-70 ℃ and cooled to room temperature.

The use method comprises the following steps:

the fingertips are applied evenly to cover the blemishes, to even out the skin tone, and to provide a natural make-up.

Example 4: pressed powder

Phase A:

27.17% Talc

10.0% Zinc stearate

10.0% Kaolin

7.5% calcium silicate

3.0% corn starch

15.0% mica

0.2% propyl p-hydroxybenzoate

11.0% titanium dioxide-Encapsulated in silica

3.5% iron oxide-yellow-encapsulated in silica

0.86% iron oxide-red-encapsulated in silica

0.42% iron oxide-black-encapsulated in silica

Phase B:

1.0% polydimethylsiloxane 50Cst

1.0% of sorbitan sesquiisostearate

3.5% squalane

----------

100.0％

The preparation process comprises the following steps:

1. phase a was pre-milled using a micronizer.

2. Phase B was slowly added to phase a using a ribbon blender.

3. Compaction in the pan.

The use method comprises the following steps:

the sponge powder puff was used uniformly for natural makeup.

Example 5: vermicelli

Phase A:

28.0% phenyl trimethicone

25.0％C_12-15Alkyl ethyl hexanoate

12.8% polyethylene wax-180 cps

20.00% aluminum octenyl succinate starch

3.0% mica

Phase B:

8.8% titanium dioxide polydimethylsiloxane-Encapsulated in silica

1.8% iron oxide-yellow-encapsulated in silica

0.4% iron oxide-red-encapsulated in silica

0.2% iron oxide-black-encapsulated in silica

-----------

100.0％

The preparation process comprises the following steps:

1. premix phase A with a propeller mixer at 80 ℃ to 90 ℃.

2. Add phase B and mix at high speed in homogenizer.

3. Poured into a pan at 60-70 ℃ and cooled to room temperature.

The use method comprises the following steps:

lightly apply and then spread the finger tips sufficiently to cover the blemishes, to even out the skin tone and to provide a natural finish.

Example 6: thin foundation cream-oil-in-water type

Phase A:

46.8% of demineralized water

0.8% magnesium aluminum silicate

0.2% xanthan gum

0.3% of methylparaben

1.0% triethanolamine 99%

10.0% of butanediol

Phase B:

6.5% titanium dioxide-Encapsulated in silica

1.0% iron oxide-yellow-encapsulated in silica

0.3% cosmetic iron pellet-encapsulated in silica

0.3% iron oxide-black-encapsulated in silica

Phase C:

7.5% ethylhexyl palmitate

12.0% mineral oil

2.20% stearic acid

2.00% PEG-40 stearate

1.5% stearyl polyoxyethylene 2

5.0% candelilla wax

2.5% glyceryl monostearate

0.1% of ethyl p-hydroxybenzoate

----------

100.0％

The preparation process comprises the following steps:

1. phase A was premixed in a homogenizer at 70 ℃.

2. Add phase B and mix at high speed in homogenizer.

3. Phase C was premixed and heated to 70 ℃.

4. Add phase C to phase AB in a 70 ℃ homogenizer.

5. Cooled to 30 ℃.

The use method comprises the following steps:

dotting with fingertips. Spread evenly to cover imperfections, make the skin tone uniform, and provide a natural makeup.

Titanium dioxide disiloxane-DITTANY-TRI-77891 encapsulated in silica

Iron oxide-yellow-encapsulated DITTANY-Y-77492 in silica

Iron oxide-Red-Encapsulated silica DITTANY-R-77491

Iron oxide-Black-Encapsulated silica DITTANY-B-77499

DITTANY is the trade name of american cosmetics.

It is to be understood that the foregoing description is only illustrative of the invention. Various alternatives and modifications can be devised by those skilled in the art without departing from the invention. Accordingly, the present invention is intended to embrace all such alternatives, modifications and variances which fall within the scope of the appended claims.

Claims (10)

1. A pigment-containing cosmetic composition for imparting a natural cosmetic effect to the skin or lips comprising:

a cosmetically acceptable carrier for the carrier, wherein,

an active ingredient, and

a plurality of encapsulated annular iron oxide pigment particles, wherein said annular iron oxide pigment particles are encapsulated by a layer of silica encapsulant, wherein said silica encapsulant exhibits a refractive index of from about 1.4 to about 1.6 and is present in an amount of from 3 wt% to 12 wt% by weight of the encapsulated iron oxide pigment, and wherein the encapsulated pigment has an average particle size of 10 microns or less.

2. The composition of claim 1, wherein the encapsulated pigment has an average particle size of 1 to 10 microns.

3. The composition of claim 1, wherein the encapsulated pigment particles are present in an amount of from 1 wt% to 25 wt% by weight of the composition.

4. The composition of claim 2, wherein the encapsulated pigment particles are present in an amount of 1 wt% to 15 wt% by weight of the composition.

5. A method of imparting a natural-like cosmetic effect to the skin or lips comprising topically applying to a topical surface a composition comprising:

a cosmetically acceptable carrier for the carrier, wherein,

an active ingredient, and

a plurality of encapsulated annular iron oxide pigment particles, wherein said annular iron oxide pigment particles are encapsulated by a layer of silica encapsulant, wherein said silica encapsulant exhibits a refractive index of from about 1.4 to about 1.6 and is present in an amount of from 3 wt% to 12 wt% by weight of the encapsulated iron oxide pigment, and wherein the encapsulated pigment has an average particle size of 10 microns or less.

6. The method of claim 5, wherein the encapsulated pigment has an average particle size of 1 to 10 microns.

7. The method of claim 5, wherein the encapsulated pigment particles are present in an amount of from 1 wt% to 25 wt% by weight of the composition.

8. The method of claim 6, wherein the encapsulated pigment particles are present in an amount of 1 wt% to 15 wt% by weight of the composition.

9. The method of claim 8, wherein the localized surface is the lips.

10. The method of claim 8, wherein the topical surface is skin.