CA1303512C - Self-tanning lotion containing a melanine precursor - Google Patents

Abstract

The subject of the invention is a self-tanning sunscreen preferably in the form of a milk and containing, in combination, a filter for protection against UVB rays, a self-tanning agent and a melanin precursor. to speed up natural tanning. The person using this cream gets an immediate coloring of the skin and is protected against sunburn. It also benefits from an acceleration of its natural booming process. The UVB protection filter is octyl dimethyl PABA, the tanning agent is dihydroxyacetone and the melanin precursor is preferably glucose tyrosinate.

Description

1 ~ 035 ~ 2 The subject of the present invention is a new cream self-tanning sunscreen preferably in the form of a milk and containing, in combination, at least one filter of protection against ultraviolet rays UVB, at least one agent self-tanner and at least one melanin precursor for access lighten the natural tan ~
There are many on the market today creams comprising one or more filters and ~ or sunscreens whose main purpose is to protect the skin of people posing in the sun.
The creams in question, hereinafter referred to as Generic name for "sunscreen" usually contain:
- or a UVA filter which can consist of oxybenzone and whose purpose is to prevent pre-matured skin and protect the skin from photosensitivity phenomena;
- or a UVB filter which can be constituted by the a-octyl-dimethyl-p-aminobenzoic acid (octyl-dimethyl PABA) and whose purpose is to protect the skin against sunburn;
and - or, most often, a mixture of UVA filters and UVB.
These filters are usually mixed with a or more moisturizers such as vitamin F or with one or more protective agents for the skin such as dimethicone.
The protection quality of these sunscreens is obviously directly proportional to the amount of UVA and / or UVB filters they contain. This quality of protection is usually "quantified" by a number such that 2, 6, 8, 12, 15, 32, etc ... O ~ it being understood that the higher the number great plus sunscreen protects against UVB rays.
Of course, extremely sensitive people and burn prone should use high number creams to protect themselves as much as possible from UV rays and, from there, avoid sunburn and photosensitivity. On the other hand, people with less sensitive skin capable of sunbathing 5 ~
naturally can use more number sunscreens low, usually less than 10, which contain only a UVB filter to prevent sunburn without preventing UVA tanning.
There are also creams or lotions on the market say "self-tanning" containing one or more agents to -such as dihydroxyacetone which has been known for a very long time many years as an artificial "dye" for the skin (see, for this purpose, Canadian patent 600,882). Of course, such self-tanning creams or lotions assure their users a beautiful artificial tan. These creams, however, do not protect in no case sunburn.
It has also been suggested in the literature of for-mulate sunscreens including both dihydroxya-ketone as a self-tanning agent and a protective ray filter UVB, such as homomenthyl salicylate (see patent of United States no 3.177.120) or octyl-dimethyl PABA (see U.S. Patent No. 4,434,154). Such creams have of course the advantage of satisfying people who burn easily and wanting to tan quickly, as long as they protect them from UVB rays while ensuring them an artificial coloring of the skin temporarily placement of the natural tan that they can only get for a few days.
The subject of the present invention is a new form mulation of self-tanning sun creams, of the above type described, which further incorporates, in a completely original nale, a melanin precursor such as gluco- tyrosinate in order to speed up natural tanning as much as possible exposure to the sun.
Thanks to this addition, the person using the so-milk according to the invention, not only obtains a coloring immediate and sunburn protection but also an acceleration of its natural tanning process, 1 ~ 0 ~ 5 ~ 2 which is of course much more "sustainable" than tanning artificial obtained by dihydroxyacetone.
The present invention therefore relates to ~ a cream self-tanning sunscreen comprising, in combination: an agent spray tan; a UVB protection filter;
and a precursor of m ~ lanine to accelerate natural tanning, the remainder of the composition consisting of excipients and dermatologically acceptable additives.
According to the invention, any one can be used melanin precursor which is physiologically acceptable.
However, it is preferable to use from 0.5 to 1% of tyrosinate glucose as a precursor, this product being an ester of L-tyrosine, amino acid necessary for the synthesis of skin pymentation.
Of course, in the basic composition, we can add one or more moisturizers such as vitamin F and one or more protective agents for skin such as dimethicone.
The cream according to the invention can be provided under form of cream. It is however preferably presented under form of milk (~ oil-in-water emulsion). Depends on quantity of octyl-dimethyl PABA contained in the formulation, the cream or milk according to the invention may have a varying number at will from 2 to 15.
The self-tanning sunscreen according to the invention is advantageously characterized in that it comprises:
- from 2.5 to 4% by weight of dihydroxyacetone used as an artificial self-tanning agent;
- from 4.0 to 6.0% by weight of octyl-dimethyl PABA
used as a UVB protective filter;
- from 3.5 to 4.5% by weight of a moisturizing agent preferably consisting of vitamin F or derivatives of the latter such as glyceryl linoleate or arachidonate;
- 1.5 to 2.5% by weight of a protective agent for the skin, preferably made up of dimethicone, and - from 0.5 to 1% by weight of a melanin precursor ! ~ ' 1 ~ 03 ~ 2 physiologically acceptable, preferably consisting of glucose tyrosinate, the remainder of the cream consisting of excipients pients and usual additives to this type of cream, which should of course be dermatologically acceptable than. It is thus possible to add as additives to this composition other agents such as stabilizers, humidity and / or pH regulating agents, emulsifying agents, antioxidants, surfactants, etc.
As an example of excipients or additives, one can use water to get adequate self-tanning milk glycerin, lanolin alcohols and any type of oil mineral, emulsifying wax, perhydrosqualene, al-cool cetyl, cholesterol, diazolidinyl urea, me-thyl paraben, propyl paraben and one or more fragrances.
Of course, the degree of protection offered by the cream or milk according to the invention depends on the percentage of octyl dimethyl PABA used. For example, a milk prepared according to the present invention with 5 ~ octyl-dimethyl PABA was found offer a protective power equivalent to number 6.
EXAMPLE
Self-tanning milk with protective power tion 6 has been prepared. The composition of this milk was as follows:
3% by weight of dihydroxyacetone;
5% by weight of octyl-dimethyl PABA;
4% by weight of glyceryl linoleate;

2% by weight of dimethicone; and 0.75% by weight of glucose tyrosinate, this acid ester amine being used as a melanin precursor;
the rest of the formulation consisting of water, gly-cerine, lanolin alcohols, mineral oil, emulsifying wax, perh ~ drosqualene, cetyl alcohol, cholesterol, diazolidinyl urea, methyl and propylparaben and perfume (s).
S ~ Z

Tests have been carried out with this milk on a group people with relatively sensitive skin but able to tan naturally. This milk has helped protect these people from sunburn from UVB rays. No filters being planned for UVA rays, people were able to start tanning zer naturally. This natural tanning effect has been substantial partially accelerated thanks to the melanin precursor integral part of the composition.
In addition, people who have tried this milk have seen their natural tan accentuated thanks to the dihydroxyacetone used as a self-tanning agent.

Claims (6)

The achievements of the invention about of which an exclusive property or privilege right is claimed are defined as follows: 1. A self-tanning sunscreen, comprising, in combination:
- a self-tanning agent;
- a radiation protection filter UVB; and - a melanin precursor to accelerate natural tanning, the remainder of the composition consisting of dermatologically acceptable excipients and additives. 2. Sun cream according to claim 1, characterized in that it comprises, in combination:
- from 2.5 to 4% by weight of a self-tanning;
- 4.0 to 6.0% by weight of a filter protection against UVB rays;
- 3.5 to 4.5% by weight of a hydrating agent;
- 1.5 to 2.5% by weight of a protective agent skin; and - 0.5% to 1% by weight of a precursor of the melanin, the remainder of the composition consisting of dermatologically acceptable excipients and additives. 3. Sunscreen according to claim 1 or 2, characterized in that the self-tanning agent is the dihydroxyacetone, the protective filter against UVB rays is octyl dimethyl PABA and the precursor of melanin is the glucose tyrosinate. 4. Sun cream according to claim 2, characterized in that:
- the self-tanning agent is the dihydroxyacetone;
- the radiation protection filter UVB is octyl-dimethyl PABA;
- the moisturizing agent is vitamin F or derivatives thereof;
- the skin's protective agent is dimethicone; and - the melanin precursor is tyrosinate glucose. 5. Self-tanning cream according to claim 4, characterized in that it contains:
- 3% by weight of dihydroxyacetone;
- 5% by weight of octyl-dimethyl PABA;
- 4% by weight of glycerile linoleate;
- 2% by weight of dimethicone; and - 0.5% by weight of glucose tyrosinate. 6. Sunscreen according to claim 1, 2, 4 or 5, characterized in that the excipients are chosen so that it comes in the form of a milk.