Sunscreen compositions and methods for boosting efficacy
AssigneeL'oreal
InventorsSusan Halpern Chirch, Anne-Laure Suzanne Bernard, Nicolas David Stebbins
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Abstract
The present disclosure relates to sunscreen compositions that are unique in simultaneously protecting skin from heat in while blocking UV radiation. The sunscreen compositions typically include: (a) laponite; (b) one or more UV filters; (c) one or more emulsifiers; and (d) water. The sunscreen compositions are useful for protecting skin from UV damage caused by sun exposure and for preventing heat from reaching the skin. Furthermore, the present disclosure describes methods for using laponite to boost the SPF of sunscreen compositions.
Claims22
A sunscreen composition comprising:
- (a) about 0.1 to about 10 wt. % of synthetic layered silicates of sodium and magnesium and/or synthetic layered silicates of sodium, lithium and magnesium;
- (b) about 0.1 to about 30 wt. % of a one or more UV filters;
- (c) about 0.1 to about 10 wt. % of one or more nonionic emulsifiers;
- (d) about 50 to about 95 wt. % water;
- and
- (e) one or more film formers;
- wherein the weight percentages are based on the total weight of the sunscreen composition;
- and
- wherein the sunscreen composition simultaneously protects the skin from both UV radiation and heat.
(canceled)
The sunscreen composition of 1, wherein the amount of emulsifier(s) of (c) is about 0.1 wt. % to about 5 wt. %, based on the total weight of the sunscreen composition.
(canceled)
A method for boosting SPF of a sunscreen composition comprising UV filters, the method comprising adding laponite to the sunscreen composition, thereby boosting the SPF of the UV filters, wherein the sunscreen composition comprises the following components, based on the total weight of the sunscreen compositions:
- (a) about 0.1 to about 10 wt. % of synthetic layered silicates of sodium and magnesium and/or synthetic layered silicates of sodium, lithium and magnesium;
- (b) about 0.1 to about 30 wt. % of one or more UV filters;
- (c) about 0.1 to about 10 wt. % of one or more emulsifiers;
- and
- (d) about 50 to about 95 wt. % water.
A sunscreen composition comprising:
- (a) about 0.1 to about 10 wt. % of synthetic layered silicates of sodium and magnesium and/or synthetic layered silicates of sodium, lithium and magnesium;
- (b) about 0.1 to about 30 wt. % of a combination of UV filters, the combination comprising octocrylene, avobenzone (butyl methoxydibenzoylmethane), oxybenzone (benzophenone-3), octisalate (ethylhexyl salicylate), and homosalate in the following ratios relative to avobenzone:
- the ratio of octocrylene to avobenzone is 1.6:1.0 to 2.4:1.0;
- the ratio of oxybenzone to avobenzone 1.0:1.0 to 1.6:1.0;
- the ratio of octisalate to avobenzone is 0.8:1.0 to 1.3:1.0;
- and
- the ratio of homosalate to avobenzone is 2.8:1.0 to 4.3:1;
- (c) about 0.1 to about 10 wt. % of one or more nonionic emulsifiers selected from the group consisting of selected from the group consisting of a polyol ester, a glycerol ether, an oxyethylenated and/or oxypropylenated ether, and/or an ethylene glycol polymer;
- (d) about 50 to about 95 wt. % water;
- and
- (e) one or more film formers;
- wherein the weight percentages are based on the total weight of the sunscreen composition;
- the sunscreen composition simultaneously protects the skin from both UV radiation and heat;
- and application of at least 2.0 mg/cm2 of the composition to the skin maintains the skin temperature at or below a threshold temperature of 40° C. for at least 10 seconds of exposure to heat flux of 40 kW/m2.
Dependencies are inferred from the claim text.