JP4300034B2 - Cosmetic composition containing rosemary extract and DHA - Google Patents

Description

  The present invention relates to cosmetic compositions. More particularly, the present invention relates to self-tanning cosmetic compositions.

  Since exposure to the sun is considered a significant health risk, the desire to sit and tan for a long time has been significantly reduced recently. However, most people still have a desire to get tanned skin. The most prudent consumer solution is the use of self-tanning agents. These products usually use a compound called dihydroxyacetone (DHA), which interacts with skin proteins to produce a wheat color that resembles the sun-burned color. Early self-tanning agents have a number of drawbacks, and as a result, self-tanning agents have not become widely prevalent. The main drawback was that it produced an unnatural orange color by humans. However, self-tanning agents have been greatly improved in recent years, and for most products currently available, users can obtain natural and fairly long-lasting colors. One disadvantage that remains in self-tanning, which is a factor disliked by consumers, is that many users have an unpleasant odor after use, which lasts up to 24 hours. This unpleasant odor apparently arises from compounds that form on the skin to which the self-tanning agent has been applied. The only solution to date has been to add a fragrance or oil to hide this smell to some extent. However, the addition of perfume was not always an acceptable option for any product and in any case did not approach the root problem, i.e. neutralizing the compounds produced on the skin. To date, this problem continues to affect self-tanning agents, which may prevent more frequent use of self-tanning agents. The present invention provides a solution to the odor caused by applying a self-tanning agent to the skin.

SUMMARY OF THE INVENTION The present invention relates to a cosmetic composition containing an effective amount of rosemary extract or its active ingredients together with DHA. As used herein, “cosmetic composition” includes any composition containing DHA for topical application to the skin, which also relates to, for example, PUVA therapy and is used for therapeutic applications. Including goods.

  The present invention further relates to a method for reducing or preventing the generation of malodor caused on the skin by application of a DHA-containing self-tanning agent comprising applying to the skin a composition comprising DHA together with an effective amount of rosemary extract.

DETAILED DESCRIPTION It was an unexpected discovery that the addition of rosemary extract to a DHA-containing composition prevents or reduces the typical malodor associated with applying the DHA composition to the skin. . Rosemary extract is a known natural substance extracted from rosemary plants, and its properties as an antioxidant are well understood. However, although the properties are known, the problem seems to be caused by a reaction on the skin (although this reaction is still largely unknown) rather than by decomposition of the formulation as in this case. It was totally unexpected that the rosemary extract has such a wonderful effect.

  Rosemary extract is a generic name for many different chemical compositions that may contain several different active ingredients. Common components found in rosemary extracts include carnosol, carnosic acid, methoxycarnosic acid, rosmarinic acid, rosmanol and rosmaridiphenol, which are contained in different proportions for each extract. A number of rosemary extracts are commercially available and any can be used in the present invention. Particularly preferred, however, is a rosemary extract called “Guardian” manufactured by Earth Applied Products. This extract contains about 12-30% active rosemary extract containing at least 5% phenolic diterpenes in a base of lecithin, acetylated hydrogenated vegetable glycerides and propylene glycol. In particular, this active moiety contains at least 50% carnosic acid, 20-35% carnosol, about 5-15% methoxycarnosic acid, and also contains small amounts of rosmanol, rosmarinic acid, and rosmaridiphenol. . As used herein, the term “rosemary extract” does not refer to the rosemary extract itself, but is synthesized from a raw material other than rosemary or other than rosemary, or obtained from a natural source. It also includes a composition obtained by adding individual active ingredients as mentioned above alone or in combination to an amount corresponding to the amount described in the section of use of rosemary extract.

  The active rosemary extract can be used in an amount of about 0.001 to about 50% by weight based on the total composition in the DHA formulation. However, because this extract is extremely potent and requires only a small amount to reduce malodor, the preferred range of use of the extract is from about 0.1 to about 10% by weight of the composition. The extract may be added to any type of formulation in which DHA is commonly used, such as creams, lotions, sprays, sticks, etc., and even aqueous, water / oil type, Alternatively, it may be anhydrous. The amount of DHA used is in line with the normal usage of this material and is usually in the range of about 1-10%. Another unexpected result of using this rosemary extract is that it has no adverse effect on the color development of DHA. DHA is a relatively unstable substance, and its performance is likely to change when other incompatible substances are present. Surprisingly, however, the rosemary extract does not have any adverse effect on color development, and in some cases, it appears that there is an improvement in color development.

  The invention may be further understood by reference to the following non-limiting examples.

  First, a study was conducted to identify compounds that help reduce malodor associated with the application of DHA to the skin. Initial attempts tested compounds that are generally considered to have malodor reducing properties, namely dipropylene glycol, zinc acetate, choline, and aloe vera gel. None of these compounds gave consistent and positive results.

  The next experiment was conducted on a new ingredient, “Gardian” rosemary extract, from Earth Supplies Products. The effect of this rosemary extract (RME) on malodor formation in 14 panelists was investigated using an aqueous solution of DHA and rosemary extract. Color development and odor were tested against panelists to determine if there was any change in the DHA reaction in the presence of rosemary extract.

Results and Discussion I) Clinical trial: When DHA-only aqueous solution was applied and when DHA and RME were both applied to the skin. In the presence of RME, 13 of 14 patients showed a significant improvement in malodor (RME 0. 25%). One panelist did not produce any odor when DHA was applied. The improvement in malodor was most noticeable 24 hours after application to the skin. Under these conditions, we observed that malodor formation was reduced by more than 90%.

  By comparing the color development between the test composition and the control composition, it was found by observation that there is no difference in color in the presence of RME. (In some cases, the color development was slightly improved.) Therefore, by using RME, while the bad odor was greatly reduced, the suppression of the DHA color development reaction seen so far when other components were tested was Did not occur.

  The composition of the present invention, water and oil emulsion is shown below.

Substance weight%
Cyclomethicone 11.00
Cetyl dimethicone copolyol 1.00

Cyclomethicone / PEG / PPG-18 / 18
Dimethicone 5.00
Tocopheryl acetate 0.20
Polysilicone 7 / Cyclomethicone 1.50
Fragrance 0.40

Deionized water appropriate amount DHA 4.00
Glycerin 8.00
Sodium chloride 0.80
Lactic acid 0.50
Pantethine 0.02

Cyclomethicone 2.00
Black iron oxide 0.02

Iron oxide / alumina 0.38
Mica / Titanium dioxide / Iron oxide dimethicone 0.22
Mica / iron oxide 0.14

Preservative 0.50
Rosemary extract 0.25

Cyclomethicone 1.00
Cyclomethicone / Dimethicone / Vinyl Dimethicone Crosspolymer 3.50

Claims (20)

A cosmetic self-tanning composition comprising an amount of rosemary extract containing at least carnosic acid and an effective fraction thereof , together with an amount of DHA effective for self-tanning, and an active fraction thereof.   2. The composition of claim 1 comprising 0.0001-50% rosemary extract and 1-10% DHA.   The composition of claim 1 containing 0.1 to 10% rosemary extract.   The composition of claim 1 wherein the rosemary extract contains carnosol and carnosic acid.   The composition of claim 1, wherein the rosemary extract contains at least 50 wt% carnosic acid.   The composition of claim 1, wherein the rosemary extract contains 20-35 wt% carnosol.   The composition of claim 1, wherein the rosemary extract contains 5 to 15 wt% methoxycarnosic acid.   A cosmetic composition comprising 1-10 wt% DHA and 0.1-10 wt% rosemary extract.   9. The composition of claim 8, wherein the rosemary extract contains at least 50% by weight carnosic acid.   10. The composition of claim 9, wherein the rosemary extract contains 20-35% by weight carnosol.   11. The composition of claim 10, wherein the rosemary extract contains 5-15% by weight methoxy carnosic acid.   A method of formulating a DHA-containing composition that produces little or no malodor when applied to the skin, comprising adding to the DHA-containing composition an effective amount of rosemary extract to reduce malodor.   13. The method of claim 12, wherein the amount of rosemary extract is 0.1 to 10% by weight.   14. The method of claim 13, wherein the rosemary extract contains at least 50% by weight carnosic acid.   15. The method of claim 14, wherein the rosemary contains 20-35% by weight carnosol.   16. The method of claim 15, wherein the rosemary extract contains 5-15% by weight methoxy carnosic acid.   A method of reducing or preventing malodor formation on the skin associated with a DHA-containing composition comprising applying the composition of claim 1 to the skin.   A method of reducing or preventing malodor formation on the skin associated with a DHA-containing composition comprising applying the composition of claim 5 to the skin.   A method of reducing or preventing malodor formation on the skin associated with a DHA-containing composition comprising applying the composition of claim 8 to the skin.   A method of reducing or preventing malodor formation on the skin associated with a DHA-containing composition comprising applying the composition of claim 11 to the skin.