Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Patent
1999-09-03
2000-10-24
Dodson, Shelley A.
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
424 60, 424400, 424401, A61K 742, A61K 744, A61K 700
Patent
active
061362999
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to sunscreen compositions.
BACKGROUND OF THE INVENTION
Many modern sunscreens are formulated to achieve high sun protection factors (SPF). It is desirable that such sunscreens be able to remain on the skin for long periods of time, even during or after immersion in water, or in the presence of perspiration. The ability of a sunscreen to remain on the skin is referred to herein as its substantivity.
For convenience of manufacture, and to achieve desirable cosmetic properties such as ease of spreading, most sunscreen compositions are formulated as emulsions comprising an oil phase and a water phase. A disadvantage of emulsions is that they may involve the use of hydrophilic surfactants, and these can significantly reduce the substantivity of the associated sunscreen.
It is an object of at least one form of the present invention to provide a sunscreen composition that has substantial substantivity.
BRIEF DESCRIPTION OF THE INVENTION
According to one aspect of the invention there is provided a composition suitable for application to the skin of a human for use as a sunscreen. the composition having been formed by combining the following ingredients: fluid containing the absorbing agent.
Preferably the metal carboxylate comprises a metal stearate, for example magnesium stearate, aluminium stearate, or aluminium monostearate.
Alternatively other metal carboxylates of similar long chain organic acids included branched or unbranched saturated or unsaturated acids can be used.
Conveniently the metal carboxylate makes up approximately 12% to approximately 20% by weight of the ingredients.
Desirably the medium comprises approximately 20% to approximately 30% by weight of a volatile silicone, for example cyclomethicone.
Expediently the medium comprises approximately 2% to approximately 5% by weight of a non-volatile silicone, for example phenyldimethicone.
Optionally the ultra-violet radiation absorbing agent comprises all or some of the following substances: approximately 7% to approximately 10% by weight, as butylmethoxydibenzoyl methane) preferably in the amount of approximately 1% by weight, approximately 5% by weight, approximately 5% by weight, and approximately 5% by weight.
Advantageously the ingredients comprise isopropyl myristate, preferably in the amount of approximately 10% to approximately 26% by weight.
According to a further aspect of the invention there is provided a method of producing a sunscreen composition comprising the steps of: radiation absorbing agent to form a mixture thereof, period of time to dissolve the metal carboxylate, and gel sunscreen composition.
Desirably the mixture is agitated during the heating of step (ii).
Conveniently during step (ii) the mixture is held at a temperature of approximately 120 degrees Celsius, preferably for approximately 10 minutes.
Expediently the cooling at step (iii) is at a rate of approximately 20 degrees Celsius per minute, preferably for approximately 4-5 minutes.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Some aspects of the invention will now be described by way of example, although it should be appreciated that the invention is in no way limited to such examples.
It has been surprisingly found that in the production of sunscreen compositions a pharmaceutically acceptable metal carboxylate, such as magnesium stearate, is effective both as a gelling agent and as a water repellent.
A preferred sunscreen composition according to the invention generally excludes components of a distinct hydrophilic nature, for example water hydrophilic surfactants and hydrophilic excipients. The avoidance of water hydrophilic surfactants and hydrophilic excipients enables the composition, which is in the form of a gel, to display significant substantivity. The sunscreen composition is designed to provide a high degree of protection in the UVA and UVB regions, with an SPF of between approximately 20 to 50. It will be appreciated that the percentage by weight of ultra-violet radiation or light absorbing agents in the c
Dodson Shelley A.
Donville Holdings Limited
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