GB2604653A

GB2604653A - A tanning composition

Info

Publication number: GB2604653A
Application number: GB2103484.8A
Authority: GB
Inventors: Frances Mone Rebecca
Original assignee: Ubeauty Global
Current assignee: Ubeauty Global
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2022-09-14
Also published as: GB202103484D0

Abstract

A tanning composition for topical administration by humans, the composition comprising: (i) erythrulose (ii) an Aloe plant extract; and (iii) a dermatologically acceptable carrier, wherein the Aloe plant extract is present in a preferred amount of greater than 2.5% (w/w) of the composition. The composition has a dihydroxyacetone (DHA) content of less than 2% w/w and is preferably free of DHA. Also disclosed is method of tanning (skin colour enhancement) comprising administering to the skin of a subject an effective tanning amount of said tanning composition.

Description

A TANNING COMPOSITION

This invention relates to a tanning composition and more particularly to a tanning composition for topical administration by humans, as well as methods of cosmetic tanning using the compositions.

Background of the Invention

Numerous products are known for colouring the skin to provide a tanned appearance or for promoting natural tanning of the skin. For example, tanning tablets that contain substances that are precursors to, or promote the formation of, melanin in melanocytes in the skin are commercially available. Additionally, tanning tablets that contain natural pigment substances such as carotenoids that are deposited in the epidermis or sub-cutaneous fat layers and provide the skin with a more highly coloured appearance akin to a tan are also available.

In addition to these orally ingestible tanning tablets, a number of topical formulations or solutions to provide a tanned appearance to users are also commercially available.

However, a number of these topical formulations suffer from disadvantages. For example, many tanning formulations do not provide a natural-looking tanned appearance. Instead, tanning formulations often result in a user's skin being coloured with an artificial orange colour. In addition, due to their method of application, many tanning formulations give a streaky appearance, rather than a consistent and even appearance.

Many known topical tanning products use dihydroxyacetone (DHA) as the active tanning component. These products generally have an unpleasant smell due to the presence of the dihydroxyacetone. A further problem associated with tanning compositions comprising DHA as a tanning agent is that some people are sensitive or allergic to DHA and therefore the compositions are unsuitable for some users.

Therefore, there exists the need for improved tanning compositions which do not suffer from the disadvantages noted above, preferably tanning compositions which do not contain DHA.

The Invention The present invention provides an improved tanning composition for providing cosmetic tanning of human skin.

Accordingly, the invention provides a tanning composition for topical administration by humans, the composition comprising: (i) erythrulose; (ii) an Aloe plant extract; and (iii) a dermatologically acceptable carrier, wherein the tanning composition comprises less than 2% (w/w) dihydroxyacetone (DHA) of the total composition.

Also provided is a tanning composition for topical administration by humans, the composition comprising: erythrulose; (ii) an Aloe plant extract; and (iii) a dermatologically acceptable carrier, wherein the Aloe plant extract is present in an amount of greater than 2.5% (w/w) of the total composition.

The inventor of the present application has found that such compositions result in users' skin being given a gradual, natural, streak-free, healthy glow (rather than an artificial orange colour). In addition, users of the compositions of the invention reported a reduction in the unpleasant smell usually associated with tanning compositions and the compositions may be used by individuals who have intolerances to dihydroxyacetone.

It has been found that the presence of an Aloe plant extract improves the solubility of erthyulose and the formulation of the present invention uses an Aloe plant extract to formulate the erythulose as a gel, which can be absorbed into the skin.

Accordingly, the present invention provides formulations which contain higher amounts of erythulose than previously known compositions. As a consequence of this, there is no need to include DHA as an additional tanning agent.

References herein to percentages by weight (w/w) refer to the percentage weight relative to the total weight of the composition, unless indicated to the contrary.

The term "tanning" as used herein refers to the process of changing the colouration of skin so that it has a more tanned or highly coloured appearance. The tanning component is capable of reacting with human skin to provide a more tanned appearance. The term "capable of reacting with human skin" is used in a general sense to include components that undergo a chemical reaction in the skin to produce a tanning colour, as well as components that act simply as dyes, and components that stimulate the development of natural skin pigments.

The tanning compositions comprise the polyhydroxy-ketone, erythrulose, which is capable of undergoing a Mai!lard reaction with amino acids in skin keratin to produce a melanoidin.

The erythrulose is typically present in an amount of from 0.5% to 15% (w/w) of the composition, and suitably the erythrulose is present in an amount from 1% to 12%, preferably from 1.5% to 10% and most preferably from about 2% to about 7%.

The tanning compositions preferably contain very little or no dihydroxyacetone (DHA). Typically, DHA is present in an amount of less than 2% (w/w) of the composition. Suitably, DHA is present in an amount of less than 1.5% (w/w) of the composition. Preferably, DHA is present in an amount of less than 1% (w/w) of the composition. More preferably, DHA is present in an amount of less than 0.5% (w/w) of the composition. Most preferably DHA is present in trace amounts (e.g. 0.1% (w/w) or less) or not present at all.

The tanning compositions comprise an Aloe plant extract. Preferably the Aloe plant extract is one suitable for use in cosmetics. Non-limiting examples of Aloe plant extracts suitable for use in cosmetics include extracts from Aloe arborescens Miller, Aloepenyi Baker, Aloe andongenesis, Aloe ferox and Aloe barbadensis (e.g. Aloe barbadensis Miller). Most preferably the plant extract is from Aloe barbadensis. One benefit of including and Aloe extract (e.g. Aloe barbadensis) is as a skin-soothing component. Additionally, and without wishing to be bound by theory, it is thought that Aloe extract acts as a gelling agent and improves the stability of erythrulose in aqueous formulations. This allows a higher percentage of erythrulose to be included in the formulation without the tanning formulation separating.

Non-limiting examples of the tanning composition comprises Aloe plant extract in powder or liquid form. In preferred embodiments, the tanning composition comprises Aloe plant extract in powder form. In the most preferred embodiments, the tanning composition comprises Aloe barbadensis plant extract in powder form.

The Aloe plant extract is typically present in an amount of from 0.1% to 10%, suitably 2% to 10%, preferably 2.5% to 9% and most preferably 3% to 8%.

The dermatologically acceptable carrier (iii) (which may also be referred to as a vehicle) is preferably an aqueous carrier and may constitute up to about 99% (w/w) of the composition. For example, the dermatologically acceptable carrier (iii) may constitute from about 40% to about 99% (w/w) of the composition, more usually from about 45% to about 95% (w/w), and more typically from about 60% to about 90% (w/w) of the composition.

The dermatologically acceptable carrier (iii) typically comprises one or more substances (for example two or more, or three or more) selected from water, propylene glycol, butylene glycol, glycerol and mixtures thereof.

In one embodiment, the dermatologically acceptable carrier (iii) comprises (or consists of) water, propylene glycol, butylene glycol and glycerol.

In another embodiment, the dermatologically acceptable carrier (iii) comprises (or consists of) propylene glycol, butylene glycol and glycerol.

Previously, only oil-based erythulose-containing tanning formulations were available due to the relatively low solubility of erythulose in water. As mentioned herein, the Aloe plant extract allows the erythulose to be formulated in high amounts in an aqueous gel, which can be absorbed into the skin. Accordingly, preferably the dermatologically acceptable carrier is or comprises water.

In some embodiments, water constitutes the major component of the demiatologically acceptable carrier. For example, water may constitute at least 50% (w/w) of the dermatologically acceptable carrier, typically at least 60%, more typically at least 70% and usually at least 75% (w/w) of the dermatologically acceptable carrier.

The compositions of the invention are topical compositions for application to the skin (e.g. human skin). As such, they can be formulated for application as sprays, creams, gels, lotions, foams, scrubs and liquids such as solutions and emulsions.

The compositions of the invention typically contain, in addition to components (i) to (iii) above, one or more preservatives (iv).

The preservatives (iv) can be selected from, for example, phenoxyethanol, benzyl alcohol, sorbic acid and its salts (e.g. potassium sorbate), sodium benzoate, dehydroacetic acid and ethylhexylglycerin. Typically, at least one of the aforesaid preservatives are present. Preferably, the compositions are substantially free of parabens. Preferably, phenoxethanol and/or sorbic acid and/or sodium benzoate are present as a preservative.

The total amount of preservative present is typically in the range from 0.01% to 15%, preferably from 0.01% to 10%, most preferably from 0.01% to 7%.

The compositions may also comprise one or more emulsifiers or surfactants (v), preferably non-ionic surfactants. Examples of surfactants that may be included in the compositions are glyceryl esters of fatty acids (e.g. glyceryl stearate), polyethylene glycol derivatives of hydrogenated plant oils such as hydrogenated castor oil (e.g. PEG 40 hydrogenated castor oil), decylglucoside, fatty alcohols such as cetearyl alcohol (a mixture of fatty alcohols, consisting predominantly of cetyl and stearyl alcohol) and polyoxyethylene ethers of fatty alcohols such as ceteareth non-ionic surfactants (mainly ethers of cetyl alcohol and stearyl alcohol), for example ceteareth-20. The total amount of emulsifier can be, for example, up to about 15% (w/w), e.g. from 0.5% to about 15% (w/w). The amount of emulsifier present will typically depend on whether the composition is a more aqueous-based composition for application as a spray or whether it contains water-insoluble components that can be emulsified to form creams or lotions. In the latter case, the amounts of emulsifier will be greater.

Thus, in some embodiments of the invention, the compositions contain one or more poorly water-soluble or water-insoluble substances, or lipophilic substances (vi) such as liquid paraffin, isohexadecane, petrolatum, fatty acids (e.g. stearic acid and Shea butter fatty acids). Such substances may be absent from the compositions or, in the case of creams and lotions, may be present in a total amount of up to about 15% (w/w), for example in the range from 3% to 15% (w/w).

The compositions can contain one or more further substances (vii) selected from: (vii-1) styreneNP copolymer; (vii-2) sclerotium gum; (vii-3) tocopheryl acetate; (vii-4) urea; (vii-5) coumarin; (vii-6) skin exfoliant; (vii-7) pH adjusting agents such as triethanolamine and citric acid; (vii-8) amino acids such as aspartate (e.g. magnesium aspartate) and glycine, alanine; (vii-9) creafine; (vii-10) sorbic acid; (vii-11) EDTA salts such as tetrasodium EDTA; (vii-12) Cocos Nucifera fruit extract; (vii-13) saccharide hydrolysate; (vii-14) pearlescent materials such as mica; (vii-15) skin conditioning agents or emollients such as isostearyl stearate; (vii-16) pigments such as titanium dioxide (Cl 77891), yellow ferric oxide (Cl 77492), red ferric oxide (Cl 77491) and black ferric oxide (Cl 77499); and (vii-17) polyvinylpyrrolidine.

In one embodiment, the compositions contain one or more (for example two or more, or three or more) further substances (vii) selected from.

(vii-1) styreneNP copolymer; (vii-2) sclerotium gum; (vii-7) pH adjusting agents such as triethanolamine and citric acid; (vii-10) sorbic acid; and (vii-11) EDTA salts such as tetrasodium EDTA; As noted above, the Aloe extract acts as a gelling agent. However, the compositions may contain one or more additional thickeners or viscosity-controlling agents (viii).

Examples of thickeners and viscosity controlling agents include carboxymethyl cellulose salts such as the calcium and sodium salts, carboxymethyl cellulose acetate butyrate, carboxymethyl hydroxyethylcellulose, cellulose gum, sclerotium gum, xanthan gum, cellulose acetate propionate carboxylate, cetyl hydroxyethylcellulose, ethylcellulose, hydrolyzed cellulose gum, hydroxybutyl methylcellulose, hydroxyethylcellulose, hydroxyethyl ethylcellulose, hydroxypropylcellulose, hydroxypropyl methylcellulose, methylcellulose, methyl ethylcellulose, methyl hydroxyethylcellulose, microcrystalline cellulose, sodium cellulose sulfate, tricontanyl PVP, polyacrylates such as sodium polyacrylates, and clay minerals such as magnesium aluminium silicate.

Many of the above thickeners and viscosity controlling agents have other desirable properties and may also function, for example, as film forming agents and emulsion stabilisers.

In addition to many of the above thickeners and viscosity controlling agents, examples of film forming agents include polyvinylpyrrolidone (PVP), acrylates, acrylamides, methacrylates and copolymers, for example Styrene/VP Copolymer.

Particular thickeners and viscosity controlling agents are sclerotium gum, tricontanyl-PVP, polyacrylates such as sodium polyacrylates, and carboxymethylcellulose.

In one general embodiment, the composition is a sprayable composition and contains substances (i) to (v), (vii-1), (vii-2), (vii-7 (citric acid)), (vii-10) and (vii-11).

In another aspect, the invention provides a tanning composition as defined herein contained within a dispensing container such as a spray container (e.g. a pump action spray container), a tube (e.g. a collapsible tube or a bottle) or a pump action dispenser.

In another aspect, the invention provides a tanning composition as defined herein in the form of a lotion, cream or paste contained within a dispensing container (such as a bottle or collapsible tube).

In a further aspect, the invention provides a method of tanning (skin colour enhancement) which method comprises administering to the skin of a subject an effective tanning amount of a tanning composition as defined herein.

The terms "subject" and "subjects" as used herein refer to animal subjects, more particularly mammalian subjects and most particularly human subjects.

The compositions of the invention are applied to an area of the body where it is desired to create a more tanned appearance. For example, the compositions may be applied to one or more of the face and neck, arms, legs, feet, chest and back. The compositions may, for example, take the form of a lotion that can be applied to the face.

The tanning methods of the invention are primarily intended as cosmetic treatments but may also be used in a medical context, for example in the treatment of subjects suffering from skin conditions such as vitiligo where natural skin pigmentation has been lost. In patients suffering from vifiligo, the tanning compositions of the invention can assist in masking areas of affected skin, or at least reducing the contrast between de-pigmented and normal skin.

An advantage of the present invention is that it allows subjects to develop a desired skin colour without the need for excessive exposure to the damaging effect of sunlight and ultraviolet radiation. A further advantage of the invention is that it does not have the unpleasant smell usually associated with tanning compositions.

Not having the unpleasant smell, is a particular benefit of this tanning composition since no scents are required to cover the smell, making the formulation gentler on the skin.

A further advantage of the tanning composition is that it contains very low amounts of and in the most preferred embodiments trace or no DHA, meaning the composition is likely suitable for use by people who are sensitive to or allergic to DHA.

The invention will now be illustrated, but not limited, by reference to the specific Examples below.

EXAMPLES

Example 1 -Tanning Formulation A tanning formulation was prepared by mixing together the following ingredients: Component Amount (Vow/w of the total composition) Water 60-90% Erythrulose 2-7% Propylene Glycol 1-5% Glycerol 0.1-5% Butylene Glycol 0.1-5% Aloe Batadensis Powder 0.1-8% StyreneNP Copolymer 0.1-5% Sclerotium Gum 0.01-2% Citric acid 0.01-2% Tetrasodium EDTA 0.01-2% Sorbic Acid 0.01-2% Once formed, the formulation is filled into a conventional dispensing container. The formulation was then be applied to the skin of a user resulting in a tanned appearance.

Comparative tests were carried out with the formulation described above and a corresponding formulation without any Aloe barbadensis plant extract. It was noticed that the presence of Aloe barbadensis increased the stability of the erythrulose-containing formulations. This allowed for a higher amount of erythrulose to be included in the formulation.

Formulations containing higher amounts of erythrulose allow for tanning formulations that contain erythrulose as the sole-tanning agent, without DHA. Previously, only oil-based erythrulose-containing tanning formulations were available due to the relatively low solubility of erythrulose in water.

However, the formulation of the present invention uses an Aloe plant extract to formulate the erythrulose as an aqueous gel, which can be absorbed into the skin.

It was also noticed that the tanning formulation with all the components as above provided good, streak-free coverage. The coverage and tanning colour achieved was at least as good as, if not better than other tanning formulations on the market using DHA as the tanning agent.

Equivalents It will readily be apparent that numerous modifications and alterations may be made to the specific embodiments of the invention described above without departing from the principles underlying the invention. All such modifications and alterations are intended to be embraced by this application.

Claims

CLAIMS1. A tanning composition for topical administration by humans, the composition comprising: (i) erythrulose (h) an Aloe plant extract; and (iii) a dermatologically acceptable carrier, wherein the tanning composition additionally comprises less than 2% (w/w) DHA.
2. A tanning composition for topical administration by humans, the composition comprising: erythrulose (h) an Aloe barbadensis plant extract; and (hi) a dermatologically acceptable carrier, wherein the Aloe barbadensis plant extract is present in an amount of greater than 2.5% (w/w) of the composition.
3. A tanning composition according to claim 2, wherein the tanning composition additionally comprises less than 2% (w/w) DHA.
4. A tanning composition according to either claim 1 or 3, wherein the tanning composition comprises less than 1%(w/w) DHA.
5. A tanning composition according to any preceding claim, wherein the erythrulose is present in an amount of from 1% to 15% (w/w) of the composition.
6. A tanning composition according to any preceding claim, wherein the Aloe plant extract is an Aloe barbadensis plant extract.
7. A tanning composition according to any preceding claim wherein the Aloe plant extract is present in an amount of greater than 3% (w/w) of the composition.
8. A tanning composition according to claim 7 wherein the Aloe plant extract is present in an amount of from 3% to 8% (w/w) of the composition.
9. A tanning composition according to any preceding claim wherein the dermatologically acceptable carrier (iii) is an aqueous carrier.
10. A tanning composition according to any preceding claim wherein the derrnatologically acceptable carrier (iii) comprises one or more substances from water, propylene glycol, butylene glycol, glycerol or a mixture thereof.
11. A tanning composition according to any of claim 10 wherein the dermatologically acceptable carrier (iii) comprises water, butylene glycol and glycerol.
12. A tanning composition according to any preceding claim wherein the composition contains a preservative selected from phenoxyethanol, sorbic acid and its salts, and mixtures thereof.
13. A tanning composition according to any preceding claim containing one or more further substances (vii) selected from: (vii-1) StyreneNP copolymer; (vii-2) Sclerotium gum; (vii-7) pH adjusting agents such as triethanolamine and citric acid; (vii-11) EDTA salts such as tetrasodium EDTA; and mixtures thereof.
14. A tanning composition according to any of claims 2 to 13 comprising: (i) erythrulose in an amount of from 2% to 7% (w/w) of the composition; (h) Aloe barbadensis plant extract in an amount of from 2.5% to 8% (w/w) of the composition; (iii) a dermatologically acceptable carrier.
15. A tanning composition according to claim 1 comprising: (i) erythrulose in an amount of from 2% to 7% (w/w) of the composition; (h) Aloe Barbadensis plant extract in an amount of from 0.1% to 8% (w/w) of the composition; (hi) a dermatologically acceptable carrier; wherein the tanning composition additionally comprises less than 2% (w/w) DHA.
16. A tanning composition according to any preceding claim contained within a dispensing container.
17. A tanning composition according to claim 16 wherein the dispensing container is a spray container (e.g. a pump action spray container), a tube (e.g. a collapsible tube) or a bottle.
18. A method of tanning (skin colour enhancement) which method comprises administering to the skin of a subject an effective tanning amount of a tanning composition according to any one of claims 1 to 17.