AU2003201950B2 - A cosmetic product to prevent and correct skin damage - Google Patents

Description

Our Ref:7779791 P/00/011I Regulation 3:2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): Address for Service: Invention Title: Unilever PLC Unilever House Blackfriars London EC4P 4BQ United Kingdom DAVIES COLLISON CAVE Patent Trade Mark Attorneys Level 10, 10 Barrack Street SYDNEY NSW 2000 A cosmetic product to prevent and correct skin damage The following statement is a full description of this invention, including the best method of performing it known to me:- 5020 1 A COSMETIC PRODUCT TO PREVENT AND CORRECT SKIN DAMAGE BACKGROUND OF THE INVENTION Field of the Invention The invention concerns a cosmetic product formed with separate containers storing skin damage prevention and correction compositions.

^O The Related Art Dual .purpose single formulation cosmetic products are quite handy and popular. Examples of 2-in-l commercial formulations are cleanser moisturizer and shampoo conditioner products. Unfortunately, single formulations often compromise the performance of the severally combined actives.

A response to this problem has been the development of skin treatment regimes. Two or more different cosmetic compositions are employed in these regimes and applied to the skin in sequential order. Illustrative commercial treatment regime compositions are cleansers, moisturizers, toners and facial foundations.

Multi-compartmented containers for dispensing a.o.t.

toiletries and medicaments have been-described in NL-A-9 301 506 and CH-A-585 647. These containers have been suggested as useful for -travel and to improve the aesthetics of a dressing table.

The present invention has sought a system to deliver actives for prevention of skin damage and also to correct damage. Herein it is suggested that separate compositions in a treatment regime be formulated for skin damage la prevention and for correction. Each of these compositions would then. require respective timing for application to skin. Prevention compositions are suggested for daytime use utilizing sunscreens as the active- Correction compositions would be for nighttime use. They should incorporate an a-hydroxycarboxylic acid as the active.

o 0 would be for nighttime use. They should incorporate an ahydroxycarboxylic acid as the active. Relatively-high levels of the g-hydtoxycarboxylic acids must be present in the correction composition. By contrast, little or none of this substance is necessary for the prevention composition during daytime use in the sun.

When a skin treatment regime requires multi-composition use, there have been problems with consumer education and 3 discipline. Education is particularly a problem in mass market outlets where a cosmetic knowledgeable sales staff is generally absent. A customer may purchase one product in a treatment regime but may be uninformed with respect to a necessary complementary regime product. Even a somewhat educated customer may select the wrong complementary product. Most frustrating is when a totally educated customer discovers that the store either does not carry the complementary product or is temporarily out of stock.

Even when a customer has been educated and supplied with proper products, the products may become separated at home.

Moreover, the necessary reinforcement of use according to a o regime may no longer be present.

Accordingly, it is an object of the present invention to provide a cosmetic product for a skin treatment regime that assists the consumer in maintaining the regime.

It is another object of the present invention to provide a cosmetic product with multi-compositions for a skin treatment regime that ensures the recommended compositions are all provided to the consumer in a single sale.

Still another object of the present invention is to provide a cosmetic product for a skin treatment regime that daily 3 serves as a reminder to the consumer as to the proper utilization of component compositions..

Yet another object of the present invention is to provide a cosmetic product for a skin treatment regime that maintains each of the compositions together in a unit to avoid separation and misplacement within a consumer's home.

SUMMARY OF THE INVENTION 1 A cosmetic product to prevent and correct skin damage is provided including: a first composition having a sunscreen present in an effective amount to prevent UV radiation from penetrating the composition to reach a user's skin; a second composition having a C 2

-C,

0 a-hydroxycarboxylic acid or salt thereof present in an effective amount to correct UV radiation induced skin damage;a first container for storing the first composition; and a second container for storing the second composition, the first and second containers being releasably joined together.

Preferably the first and second containers are each fitted with a mechanism for coupling the two Logether, with a preferable coupling being a screw thread arrangement.

Advantageously the first and second containers are jars stacked one above the other and releasably locked together through the coupling mechanism.

Also provided is a method to prevent and correct skin damage, the method including the steps of: providing a first composition having a sunscreen present in an effect amount to prevent UV radiation from penetrating the composition to reach a user's skin: providing a second composition having a C 2 -C3 0

D-

hydroxycarboxylic acid or salt thereof present in an effective amount to correct UV radiation induced skin damage; storing the first composition in a first container; storing the secnhd-composition in a second container, the first and second containers being releasably joined together; applying the first composition to the skin so as to remain in contact during daytime and to prevent UV radiation induced skin damage; and applying the second composition after application of the first composition so as to remain in contact over night on the skin to correct for any UV radiation damace.

As now claimed, according to one aspect, the present invention provides cosmetic method to prevent and correct skin damage, in which method is used a first composition having a sunscreen present in an effective amount to prevent UV radiation from penetrating the composition to reach a suer's skin, and a second composition having a C 2

-C

30 ahydroxycarboxylic acid or salt thereof present in an effective amount to correct UV radiation induced skin damage; which first composition is stored in a first container and which second composition is stored in a second container, the first and second containers fitted with a means for coupling same to one another; which method comprises applying the first composition to the skin so as to remain in contact during daytime and to prevent UV radiation induced skin damage; and applying the second composition after application of the first composition so as 3 to remain in contact overnight on the skin to correct for any UV radiation damage.

As now claimed, according to another aspect, the present invention provides the use of a product in the manufacture of a medicament to prevent and correct skin damage, which product includes a first composition having a sunscreen present in an effective amount to prevent UV radiation from penetrating the composition to reach a user's skin, and a second composition having a C 2

-C

30 c-hydroxycarboxylic acid or salt thereof present in an effective amount to correct UV radiation induced skin damage; which first composition is stored in a first container and which second composition is stored in a second container, the first and second containers fitted with a means for coupling same to one another; wherein the first composition is applied to the skin so as to remain in contact during daytime and to prevent UV radiation induced skin damage; and wherein the second composition is applied after application of the first composition so as to remain in contact overnight on the skin to correct for any UV radiation damage.

BRIEF DESCRIPTION OF THE DRAWING The above features, advantages and objects of the present invention will more fully be appreciated through the following detailed discussion, reference being made-to the sole Figure shbwing an exploded view of a stacked first and second container screwably and releasably joinable together.

DETAILED DESCRIPTION Now it has been found that a day and night skin treatment regime with respective damage prevention and correction compositions can be sold to a consumer as a unit, serve as a reminder for joint usage and also educate a customer in proper application thereof. These advantages are achieved through disposition and sale of the respective compositions in respective containers wherein the two containers are 4b joined together. Most preferably, joinder is achieved through a stacking arrangement of the containers as respective jars releasably lockable one on top another.

The Figure illustrates the dispensing package as including a first container or jar 2, a second container or jar 4 and a domed cap 6. First container 2 is fitted at an open end 5 thereof with a threaded male screw 8 that can lockingly engage cap 6 for closure of that jar. A first composition incorporating a sunscreen for use as a damage prevention formulation during daytime wear is stored within container 2.

Second container 4 at an open end thereof is also fitted with a threaded male screw 10. A second composition incorporating an a-hydroxycarboxylic acid or salt thereof is stored within this second container. Threaded male screw 10 is lockingly joinable with a threaded female screw 12 arranged below a closed bottom end 14 of the first container 2. In a preferred embodiment, the first container 2 storing the prevention composition has an outer color different from that of the outer color of the second container 4. Most preferred is that the first container 2 be colored predominantly white (day formula) and the second container 4 be colored predominantly black (night formula) The term "predominantly" means greater than 50% of the surface area of outer walls of the container. Color coding provides the consumer with an educational signal for proper use of the cosmetic product.

Beyond the package, a first essential element of cosmetic products according to the present invention is that of a first composition incorporation a sunscreen. The term "sunscreen" is used to denote ultraviolet ray-blocking compounds inhibiting absorption within the wavelength region between 290 and 420 nm. These compounds may either be organic or inorganic. The organic compounds are preferred. When the sunscreen is inorganic and serves as the sole sun protective substance, it should be present at levels ranging from 5 to 30%, preferably from 8 to 15% by weight.

Typical inorganic sunscreens include titanium dioxide, zinc oxide, iron oxide and combinations thereof. Most preferred is titanium dioxide, especially having an average particle Typical inorganic sunscreens include titanium dioxide, zinc oxide, iron oxide and combinations thereof. Most preferred is titanium diokider-especially having an average particle size no higher than 700 nm, preferably no higher than 200 nm, optimally less than 35 nm.

Organic sunscreens suitable for the present invention may be classified into five groups based upon their chemical structures: para-amino benzoates; salicylates; cinnamates; benzophenones; coumarins; azoles and miscellaneous chemicals including menthyl anthralinate. Also polymeric particles may be useful such as polyethylene and polyamides. Among FDA-approved sunscreens are those listed in the Table below.

0 mmnna=..- jIN-A Absorbers- rz Li I oxybenzole1 also known as 2-hydroxy- 4-inethoxy benzophelOle and benzophelofe-3, available as Uvinul M4-40 and Cafsorb 21141 2-6 Butyl HethOxydibeflZOYlmethane

N/A.

available as Parsol 1789 niaxybenzone, also known as 2,2 dihydroxy- 4-inethoxy beozopheloe, and benzophelOfle-8 3 SulibenzOle, also known as 2-hydroxy- 4-methoxy benzophelOfle-SSUlPholiC acid, and benzophenOle- 4 available as Uvinul and Gafsorb 2H4MS 5-10 Menthyl anthraliflate, also known as menthyl-o-amilobeflzoate 3.5-5 TlY-B Asorbers AbprQ3Ld 0 p-Amino benzoic acid, also known as PABA 5-15 Amyl dimethyl PABA also known as amyl-p-dimethyl ammonium benzoate, available as Padimate A 2-Ethoxy ethyl p-methoxy cinnawate

(NA),

available as Cinoxate and Givtan-F 1-3 Diethaflolamifle p-ethoxy cinnamate, also known as DEA rnethoxy cinnatnate, available as Parsol-Hydro 8-10 Digalloyl trioleate a component of Soiprocex 1 Ethyl-4-bis (hydroxypropyl) aminobenzoate, also known as eth yl dihydroxy propyl PABA available as Amerscreen P 2-Ethyl hexyl--2-CYalO-31 3 diphenyl acrylate, also kn own as octocrylene and available as Uvinul N-5 39 7-10 Q Ethyl hexyl p-methoxy cinnamate, also known as octyl rnethoxycinnfartate available as Parsol MCX 2-7.59 2-Ethyl hexyl salicylate, also known as octyl salicylate Glyceryl aminobenzoate. also known as glyceryl p-aminobenzoate and glyceryl.PABA,' available as Escal~l 106 2-3 Homomenthyl salicylate, also known as 3, 3.5-trimethylcyclohexcyl salicylate 4-15 0 25 Lawsome with dihydroxyaCetole.(NA) 0.25 with 33 Octyl dimethyl PABA, also known as 2-ethyl hexyl p-dimethyl p-aminobenzoate and 2-ethyl hexyl dimethyl PABA, ava-ilable 3 r as Padirnate 0 and Escalol 507 1.4-8 2-Phenyl benzimidazOle 5-sulphoic acid 1.4 Triethanolamile salicylate 5-12 organic sunscreen compound will range in ant amount anywhere from 0.1 to 25%, optimally from 1 t-o 15%, most -9 preferably from 5 to 10% by weight.

Another essential element of cosmetic products according to the present invention is that of a second composition which incorporates a C 2

-C

30 a-hydroxycarboxylic acid or salt thereof. A wide variety of a-hydroxycarboxylic acids may be employed, suitable examples of which include: a-hydroxyethanoic acid a-hydroxypropanoic acid a-hydroxyhexanoic acid Q ta-hydroxyoctanoic acid a-hydroxydecanoic acid a-hydroxydodecanoic acid a-hydroxytetradecanoic acid a-hydroxyhexadecanoic acid a-hydroxyoctadecanoic acid a-hydroxyeicosanoic acid a-hydroxydocosanoic acid a-hydroxyhexacosanoic acid, and a-hydroxyoctacosanoic acid Particularly preferred from the above list are ahydroxyethanoic acid (commonly known as glycolic acid), a- 0 25 hydroxypropanoic acid (commonly known as lactic acid) and a-hydroxyoctanoic acid (commonly known as a-hydroxycaprylic acid or HCA).

For purposes of this invention, the term ahydroxycarboxylic acids are intended to include not only the acid form but also salts thereof. Typical salts are the alkalimetal, ammonium and Co 2 -Co ammonium salts thereof. Particularly preferred are the sodium, potassium, triethanolammonium, polyethyleneimine and ammonium salts.

Combinations of all the foregoing may be present in the compositions. Amounts of the a-hydroxycarboxylic acid or salt thereof may range from 0.01 to 10 preferably from 0.1 to 12%, optimally from 0.5 to 9% by weight.

Either or botl of-the first and second compositions of the present invention may be solid or liquid, aqueous or anhydrous and opaque or transparent.

A pharmaceutically acceptable carrier is ordinarily utilised to deliver the sunscreen and the ahydroxycarboxylic acid active components of the first and second compositions. Most preferably, cosmetic compositions of this invention will be in emulsion form.

By definition, an emulsion is a dispersed system containing at least two immiscible liquid phases, one of which is dispersed in the form of small droplets throughout the other. Water and oil are the most common immiscible phases. An emulsion in which oil is dispersed as droplets throughout the aqueous phase is termed an oil-in-water emulsion. When water is the dispersed phase and an oil is the dispersion medium, a water-in-oil emulsion exists.

Contemplated within the scope of this invention are emulsions in the form of lotions and creams of both types of emulsion, those where the water phase is continuous and those where the oil phase is continuous. The amount of these phases may range from 99:1 to 1:99 by weight.

The term "pharmaceutically acceptable carrier" according to this invention includes emollients, surfactants, humectants and water. Total amount of the carrier may range from to 99.9%, preferably from 50 to 90%, optimally from 70 to by weight.

A variety of oily emollients may be employed in the compositions of this invention. These emollients may be selected from one or more of the following classes: 1. Hydrocarbon oils and waxes. Examples thereof are A variety of oily emollients may be employed in the compositions of this invention. These emollients-may be selected from one 'r more of the following classes: 1. Hydrocarbon oils and waxes. Examples thereof are mineral oil, petrolatum, paraffin, ceresin, ozokerite, microcrystalline wax, polyethylene, and perhydrosqualene.

2. Triglyceride esters such as vegetable and animal fats Kand oils. Examples include castor oil, cocoa butter, safflower oil, cottonseed oil, corn oil, olive oil, cod liver oil, almond oil, avocado oil, palm oil, sesame oil, squalene, and soybean oil.

3. Acetoglyceride esters, such as acetylated monoglycerides.

4. Ethoxylated glycerides, such as ethoxylated glyceryl monostearate.

Alkyl esters of fatty acids having 10 to 22 carbon atoms. Methyl, isopropyl, and butyl esters of fatty acids 0 are useful herein. Examples include hexyl laurate, isohexyl laurate, isohexyl palmitate, isopropyl palmitate, decyl oleate, isodecyl oleate, hexadecyl stearate, decyl stearate, isopropyl isostearate, di.isopropyl adipate, diisohexyl adipate, dihexyldecyl adipate, diisopropyl sebacate, lauryl lactate, myristyl lactate, and cetyl lactate.

6. Alkenyl esters of fatty acids having 10 to 22 carbon atoms. Examples thereof include oleyl myristate, oleyl stearate, and oleyl oleate.

7. Fatty acids having 10 to 22 carbon atoms. Suitable examples include pelargonic, lauric, myristic, palmitic, stearic, isostearic',hydroxystearic, oleic, linoleic, ricinoleic, arachidic, behenic, and erucic acids.

8. Fatty alcohols having 10 to 22 carbon atoms. Lauryl, myristyl, cetyl, hexadecyl, stearyl, isostearyl, hydroxystearyl, oleyl, ricinoleyl, behenyl, erucyl, and 2-octyl dodecanyl alcohols are examples of satisfactory fatty alcohols.

9. Fatty alcohol ethers. Ethoxylated fatty alcohols of to 22 carbon atoms including the lauryl, cetyl, stearyl, isostearyl, oleyl, and cholesterol alcohols, having attached thereto from 1 to 50 ethylene oxide groups or 1 to propylene oxide groups.

Ether-esters such as fatty acid esters of ethoxylated fatty alcohols.

11. Lanolin and derivatives. Lanolin, lanolin oil, lanolin wax, lanolin alcohols, lanolin fatty acids, isopropyl lanolate, ethoxylated lanolin, ethoxylated lanolin alcohols, ethoxylated cholesterol, propoxylated lanolin alcohols, acetylated lanolin alcohols, lanolin alcohols linoleate, lanolin alcohols ricinoleate, acetate of lanolin alcohols ricinoleate, acetate of ethoxylated alcohols-esters, hydrogenolysis of lanolin, ethoxylated hydrogenated lanolin, ethoxylated sorbitol lanolin, and liquid and semisolid lanolin absorption bases are illustrative of emollients derived from lanolin.

12. Polyhydric alcohol esters. Ethylene glycol mono and di-fatty acid esters, diethylene glycol mono- and di-fatty acid esters, polyethylene glycol (200-6000) mono- and 13 13. Wax esters such as beeswax, spermaceti, myristyl myristate, stearyl stearate.

14. Beeswax'derivatives, e.g. polyoxyethylene sorbitol beeswax. These are reaction products of beeswax with ethoxylated sorbitol of varying ethylene oxide content, forming a mixture of ether esters.

Vegetable waxes including carnauba and candelilla waxes.

0 16. Phospholipids such as lecithin and derivatives.

17. Sterols. Cholesterol, cholesterol fatty acid esters are examples thereof.

18. Amides such as fatty acid amides, ethoxylated fatty acid amides, solid fatty acid alkanolamides- Amounts of the above listed emollients may range anywhere from 0.5 to 80% by weight of the total composition.

Preferably the amounts of these emollients will range from 1 to 25%, optimally between 5 and 15% by weight.

Humectants of the polyhydric alcohol-type may also be included in the compositions of this invention. The humectant aids in increasing the effectiveness of the emollient, reduces scaling, stimulates removal of built-up scale and improves skin feel. 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, 1,2,6hexanetriol, ethoxylated glycerol, propoxylated glycerol and mixtures thereof. For best results the 14 humectant is preferably glycerol. The amount of humectant may range anywhere from 0.1 to 40%, preferably between 1 and 15% by weight of the composition.

For improved lubricity, there may also be included one or more silicone oils or fluids which may be selected from a dimethyl polysiloxane, a nethylphenyl polysiloxane and an alcohol-soluble silicone glycol copolymer. Preferred siloxanes include dimethyl polysiloxane (CTFA name: dimethicone), a polysiloxane end-blocked with trimethyl units and polydimethylcyclosiloxane, (CTFA name: C) cyclomethicone). The preferred siloxanes exhibit a viscosity from 2 to 50-. centistokes at 25 0 C. Amounts of the silicones can range from 0.1 to 80% by weight of the compositions, preferably from 1 to 20% by weight.

Surfactants can also be included in the compositions of this invention. These may be selected from .nonionic, anionic, cationic or amphoteric emulsifying agents. They may range in amount anywhere from 0.1 to 30% by weight.

Illustrative of the nonionic surfactants are alkoxylated compounds based upon fatty alcohols,

C

3 fatty acids and sorbitan. Particularly preferred is Tween an ethoxylated sorbitan (CTFA name: POE sorbitan monooleate), and Myrj 59® which is a polyethoxylated

C,,

fatty acid (CTFA name: POE (100) stearate). A preferred non-ethoxylated nonionic surfactant is Arlacel 60®, (CTFA name: sorbitan monostearate).

Both first and second compositions of the invention can also include thickeners/yiscosifiers in amounts from 0.01 to 10% by weight of the composition. As known to those skilled in the art, the precise amount of thickeners can vary depending upon the consistency and thickness of the composition which is desired. Exemplary thickeners are magnesium aluminum silicate (Veegunm), guar 15 gums (such as Jaguar HP-120®), xanthan gum, sodium carboxymethyl cellulose, hydroxyalkyl and alkyl celluloses, and cross-linked acrylic acid polymers such as those sold by B.F. Goodrich under the Carbopol® trademark.

Waterproofing agents may be included along with the sunscreen containing compositions of this invention. These agents may range in amount anywhere from 0.5 to 10% by weight. Common waterproofing agents are polymers and copolymers based on PVP and acrylic or methacrylic esters.

Specific examples are PVP/Hexadecene Copolymer (Ganex V- O 216®), PVP/Eicosene Copolymer (Ganex V-220®), FpVP/Ethyl Methacrylate/Methacrylic Acid Copolymer, Ammonium Acrylates Copolymer, and Polyolprepolymer-2 (ex Penederm/Barnet) Preservatives can desirably be incorporated into both the first and second compositions of this invention to protect: against the growth of potentially harmful microorganism.

While it is in the aqueous phase that microorganisms tend to grow, microorganisms can also reside in the oil phase.

As such, preservatives which have solubility in both water and oil are preferably employed in the present compositions- Suitable traditional preservatives for compositions of this invention are alkyl esters of parahydroxybenzoic acid. Other preservatives which have more recently come into use include hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Cosmetic chemists are familiar with appropriate preservatives and routinely choose them to satisfy the preservative challenge test and to provide product stability. Particularly preferred preservatives are methyl paraben, imidazolidinyl urea, sodium dehydroxyacetate, propyl paraben and benzyl alcohol. The preservatives should be selected having regard for the use of the composition and-possible incompatibilities between the preservatives and other ingredients in the emulsion.

Preservatives are preferably employed in amounts ranging 16 from 0.01% to 2% by weight of the composition.

When present, the amount of water in a composition may range anywhere from 1 to 99%, preferably from 20 to optimally between 40 and 70% by weight.

Minor adjunct ingredients'may also include fragrances, antifoam agents, herbal extracts, opacifiers and colorants, each in their effective amounts to accomplish their respective functions.

O Vitamins may also be included in the compositions of the present invention. Especially preferred is Vitamin A palmitate (retinyl palmitate) and Vitamin E linoleate (tocopheryl linoleate). Other esters of Vitamins A and E may also be utilized.

In a preferred aspect of the present invention, the first and second compositions will each have at least' ten components in common. Moreover, the ten components will be present at essentially identical concentrations in both the first and second compositions.

The following examples will more full illustrate the Q 25 composition embodiments of this invention. All parts, percentages and proportions referred to herein and in the appended claims are by weight unless otherwise indicated.

EXAMPLE 1 A pair of prevent and correct compositions were prepared according to the following formulations.

present at essentially identical concentrations in both the first and second compositions.

The following examples will more fully illustrate the composition embodiments of this invention. All parts, percentages and proportions referred to herein and in the appended claims are by weight unless otherwise indicated.

EXAMPLE 1 S A pair of prevent and correct compositions were prepared according to the following formulations.

0 0 TABLE I PREVENT COMPOSITION COMPONENT WEIGHT Parsol MCX® 4.00 Stearic Acid 3.00 Finsolv TN@ 3.00 Butylene Glycol 2.00 Glycerin 2.00 MYRJ 59® 2.00 Uvinul M-40® 2.00 Crodamol ISNP® 2.00 Glycerol Monostearate 1.50 Stearyl Alcohol 1.50 Glycolic Acid 1.40 Triethanolamine 1.20 Lactic Acid 1.15 Magnesium Aluminum 1.00 Silicate Arlacel 60@ 1.00 Silicone 1401® 0.80 Disodium EDTA 0.50 Jaguar HP-120® 0.50 Cholesterol 0.30 Ammonia (Aqueous 26BE) 0.30 Fragrance 0.30 Tween 80® 0.30 Polyethyleneimine 0.25 Methylparaben 0.15 Vitamin E Acetate 0.10 Propylparaben 0.10 Hydroxycaprylic Acid 0.10 Vitamin A Palmitate 0.10 Water qs

Q

TABLE II CORRECT COMPOSITION 0 0 COMPONENT WEIGHT Glycolic Acid 5.74 Butylene Glycol 3.00 Hetester® FAO/Fine 3.00 Stearic Acid 3.00 Finsolv TN® 2.50 Ceraphyl 230® 2.50 Ammonia (Aqueous 26BE) 2.20 Glycerin 2.00 .Myrj 59® 2.00 Polyethylene Imine 2.00 Stearyl Alcohol 1.50 Glycerl Monostearate 1.50 Triethanolamine 1.20 Magnesium Aluminum 1.00 Silicate SE 700 1.00 Silicone Fluid 10 1.00 Arlacel 60® 1.00 Dow Corning 1401® 0.80 Jaguar HP-120® 0.50 Disodium EDTA 0.50 Sodium Sctearoyl 0.50 Lactylate Cholesterol 0.30 Fragrance 0.30 Tween 80® 0.30 Methylparaben 0.15 Antifoam Emulsion 0.10 Vitamin E Acetate 0.10 Propylparaben 0.10 Hydroxycapry1ic Acid 0.10 Vitamin A Palmitate 0.10 Bisabolol 0.10 Water qs 0II 0 EXAMPLE 2 The Prevent and Correct dual composition product was tested for consumer acceptability in a shaved leg sting evaluation with a consumer panel. Formulations tested were identical to that described in Example 1, except for the changes in a-hydroxycarboxylic acid concentrations as noted below.

TABLE IIU COMPOSITION WEIGHT Prevent 1% glycolic, 1% lactic, sunscreen (SPF 8) Correct 4% glycolic (no sunscreen) Prevent/Correct 5% glycolic, 1% (All-in-One lactic, sunscreen Composition) (SPF 8) An expert panel of subjects were selected for the test, each being qualified and proven to show sensitivity to product differences. Subjects were provided with two charged syringes, each filled with 2 cc of sample composition and clearly labelled with left/right designations. Subjects shaved their legs in their shower using a wet razor and applied sample composition immediately upon drying off. They took note of sting sensations and filled out a standard questionnaire.

Results of the test are recorded below.

RESULTS

0 Prevent vs. Alln Magnitude of All-in- Prevent Stinging (mean) Pone 0.79 p 0.05* (0 none, 10 2.54 severe)____ (71% reduction) Duration of Sting All-in-on Prevent None 8 subjects 1 7 subjects subjects minute 9 subjects 8 1 subjects minute 1 subject Which is worse? All-in-One 14 subjects No difference 8 subjects Prevent 1 subject Correct vs. Allin-one n Aii-in- correct One 1.15 P 2.43 0.05* (52% reduction)_____ Duration of Sting All-in-one corrsat None 6 subjects 1 12 subjects minute subjects 11 1 8 subjects subjects minute subjects Which is worse? All-in-One 13 subjects No 11 subjects difference 2 subjects Correct 0 paired t-test Sequential usage of the Prevent and Correct compositions delivered a daily dose of 6% £-hydroxycarboxylic acid with sunscreen levef to provide SPF 8. The comparison product where the Prevent and Correct formulations were combined into a single "all-in-one" composition also contained 6% ahydroxycarboxylic acid with sunscreen level to provide SPF 8.

The clinical study demonstrated that use of the separate 0 Prevent and Correct compositions phased-in the delivery of a-hydroxycarboxylic acid thereby reducing the sting/consumer discomfort that arises when both formulas are blended together as a combined single composition.

Sting reduction of 71% and 52% were obtained, respectively in comparison of the Prevent and Correct compositions against the combination all-in-one product.

EXAMPLE 3 Another pair of prevent and correct compositions illustrative of the present invention are outlined below.

0 The prevent composition will have an SPF of at least 21.

TABLE IV PREVENT COMPOSITION COMPONENT WEIGHT t Propylene Glycol Isoceteth-3 14.00 Acetate Octyl Dodecyl neopentanoate 14.00 Titanium Dioxide (80 micron) 13.00 Parsol MCX® 5.00 Parsol 1789® 4.00 Cetyl Alcohol 4.00 Zinc Oxide 3.00 Dimethicone Copolyol Phosphate 3.00 Sorbitan Isostearate 2.00 Isostearic Acid 1.75 Polyoxyethylene (21) Stearyl Ether 1.50 Magnesium Aluminum Silicate 0.70 Propylene Glycol 0.50 Glycerin 0.50 Triethanolamine 0.35 Xanthan Gum 0.20 Polyoxyethylene Stearyl Ether 0.20 Glydant Plus* 0.20 Fragrance 0.20 Botanical Blend 0.10 Vitamin E Linoleate 0.10 Aloe Vera Gel 0.01 Water qs 0 26 100 TABLE V CORRECT COMPOSITION COMPONENT WEIGHT Propylene Glycol Isoceteth-3 14.00 Acetate Octyl Dodecyl neopentanoate 14.00 Lactic Acid 10.00 Triethanolamine 5.00 Cetyl Alcohol 4.00 Zinc Oxide 3.00 Dimethicone Copolyol Phosphate 3.00 Sorbitan Isostearate 2.00 Isostearic Acid 1.75 Polyoxyethylene (21) Stearyl Ether 1.50 Magnesium Aluminum Silicate 0.70 Propylene Glycol 0.50 Glycerin 0.50 Xanthan Gum 0.20 Polyoxyethylene Stearyl Ether 0.20 Glydant Plus* 0.20 Fragrance 0.20 Botanical Blend 0.10 Vitamin E Linoleate 0.

10 Aloe Vera Gel 0.01 Water qs 0 1 b 0 EXAMPLE 4 A further pair of prevent and correct compositions according to the present invention are prepared from the following components.

TABLE VI PREVENT COMPOSITION COMPONENT J WEIGHT 9& Ethylhexyl p-Methoxycinnamate 7.00 Glycerin 4.00 Oxybenzone 3.00 Alkyl Polyglycoside 3.00 Cetyl Alcohol 2.50 Glycerl Monostearate 2.00 Octyl Palmitate 2.00 Silicone Fluid 1.50 Petroleum Jelly 1.00 Methyl Paraben 0.15 Propyl Paraben 0.10 Fragrance 0.10 Antifoam 0.01 Water qs TABLE VIJ CORRECT COMPOSITION a COMPONENT WEIGHT t] Glycolic Acid 7.00 Glycerin 4.00 Triethanolamine 3.00 Alkyl Polyglycoside 3.00 Cetyl Alcohol 2.50 Glyceri Monostearate 2.00 Octyl Palmitate 2.00 Silicone Fluid 1.50 Petroleum Jelly 1.00 Methyl Paraben 0.15 Propyl Paraben 0.10 Fragrance 0.10 Antifoam 0.01 Water qs EXAMPLE Still a further pair of prevent and correct compositions according to the present invention are prepared from the following components.

0 '~rnnrHtoL.-- TABLE VCOMPOSITION *PREVENT COMPOSTTTON 1ic 0 COMPONENT WEIGHT Hexyl Laurate 8.00 Isopropyl Myristate 3.00 Stearic Acid 3.00 Propylene Glycol 3.00 Cyclomethicone 3.00 Octyl Methoxycinnamate 2.00 Panthenol 1.00 Butyl Methoxydibenzoylmethane 1.00 Disodium EDTA 0.10 Fragrance 0.10 Sodium Sorbate 0.10 Water qs 0 TABLE XX CORRECT COMPOSITION COMPONENT WEIGHT J 8.00 Hexyl Laurate Isopropyl Myristate 3.00 Stearic Acid 3.00 Propylene Glycol 3.00 Cyclomethicone 3.00 L-Lactic Acid 2.00 Panthenol 1.00 Ammonia (Aqueous 26 BE) 0.30 Disodium EDTA 0.10 Fragrance 0.10 Sodium Sorbate 0.10 Water qs 0 EXAMPLE 6 Anhydrous formulations for a pair of prevent and correct compositions according to the present invention are prepared from the following components.

TABLE X PREVENT COMPOSITION COMPONENT WEIGHT Cyclomethicone 48.30 Ethyl Alcohol 24.70 Isopropyl PPG-2 Isodeceth-7- 10.00 carboxylate Octyldimethyl PABA 7.00 Benzophenone-3 6.00 Propylene Glycol 4.00 Dicaprylate/Dicaprate 0 0 TABLE XI CORRECT COMPOSITION COMPONENT _WEIGHT Cyclomethicone '48.30 Ethyl Alcohol 24.70 Isopropyl PPG-2 Isodeceth-7- 10.00 carboxylate 0 Ammonium Glycolate 7.00 Propylene Glycol 4.00 Dicaprylate/Dicaprate Hydroxycaprylic Acid 0.50 Although this invention has been described with reference to specific Examples and package embodiments, it will be apparent to one skilled in the art that various modifications may be made thereto which fall within the scope and purview of the invention.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that the prior art forms part of the common general knowledge in Australia.

I

Claims (23)

1. The use of a product in the manufacture of a medicament to prevent and correct skin damage, which product includes a first composition having a sunscreen present in an effective amount to prevent UV radiation from penetrating the composition to reach a user's skin, and a second composition having a C 2 -C 30 a-hydroxycarboxylic acid or salt thereof present in an effective amount to correct UV radiation induced skin damage; which first composition is stored in a first container and which second composition is stored in a second container, the first and second containers fitted with.a means for coupling same to one another; wherein the first composition is applied to the skin so as to remain in contact during daytime and to prevent UV radiation induced skin damage; and wherein the second composition is applied after application of the first composition so as to remain in contact overnight on the skin to correct for any UV radiation damage.

2. The use of a product according to claim 1 wherein the means for coupling is a threaded screw.

3. The use of a product according to claim 1 or claim 2 wherein the first and second containers are stacked one above the other and releasably locked together by the means for coupling.

4. The use of a product according to any one of claims 1 to 3 wherein the first and second containers have differently colored outside walls.

The use of a product according to claim 4 wherein the color of the outside walls of the first container is predominantly white and the color of the outside walls of the second container is of a color predominantly other than white.

6. The use of.a product according to claim 1 wherein the sunscreen is an organic substance selected form the group consisting of para-amino benzoates; salicylates; cinnamates; benzophenones; coumarins; azoles; menthyl anthralinates; polyethylene; polyamides and mixtures thereof.

7. The use of a product according to claim 1 wherein the sunscreen is present in an amount ranging from 0.1 to by weight.

8. The use of a product according to claim 1 wherein the C 2 -C3o a-hydroxycarboxylic acid is selected form the group consisting of lactic acid, glycolic acid, a- hydroxycaprylic acid and combinations thereof.

9. The use of a product according to claim 1 wherein the C 2 -C 30 a-hydroxycarboxylic acid or salt thereof is present in an amount from 0.01.to 15% by weight.

The use of a product according to claim 1 wherein the first composition has at least ten separated components in common with those of the second composition.

11. The use of a product according to claim 10 wherein the at least ten separate components are present at about equal concentrations in the first and second compositions.

12. Cosmetic method to prevent and correct skin damage, in which method is used a first composition having a sunscreen present in an effective amount to prevent UV radiation from penetrating the composition to reach a user's skin, and a second composition having a C 2 -C 30 C- hydroxycarboxylic acid or salt thereof present in an effective amount to correct UV radiation induced skin damage; which first composition is stored in a first container and which second composition is stored in a second container, the first and second containers fitted with a means for coupling same to one another; which method comprises applying the first composition to the skin so as to remain in contact during daytime and to prevent UV radiation induced skin damage; and applying the second composition after application of the first composition so as to remain in contact overnight on the skin to correct for any UV radiation damage.

13. The method according to claim 12 wherein the means for coupling is a threaded screw.

14. A method according to claim 12 or claim 13 wherein the first and second containers are stacked one above the other and releasably locked together by the means for coupling.

A method according to any one of claims 12 to 14 wherein the first and second containers have differently colored outside walls.

16. A method according to claim 15 wherein the color of the outside walls of the first container is predominantly white and the color of the outside walls of the second container is of a color predominantly other than white.

17. A method according to claim 12 wherein the sunscreen is an organic substance selected form the group consisting of para-amino benzoates.; salicylates; cinnamates; benzophenones; coumarins; azoles; menthyl anthralinates; polyethylene; polyamides and mixtures thereof.

18. A method according to claim 12 wherein the sunscreen is present in an amount ranging from 0.1 to 25% by weight.

19. A method according to claim 12 wherein the C2-C 30 a- hydroxycarboxylic acid is selected form the group consisting of lactic acid, glycolic acid, a- hydroxycaprylic acid and combinations thereof.

A method according to claim 12 wherein the C 2 -C 30 a- hydroxycarboxylic acid or salt thereof is present in an amount from 0.01 to 15% by weight.

21. A method according to claim 12 wherein the first composition has at least ten separated components in common with those of the second composition.

22. A method according to claim 21 wherein the at least ten separate components are present at about equal concentrations in the first and second compositions.

23. A cosmetic method to prevent and correct skin damage as herein described with reference to the examples and the accompanying drawing. DATED THIS 20th day of March, 2003. UNILEVER PLC By Its Patent Attorneys DAVIES COLLISON CAVE