Sunscreen formulation
The present application relates to sunscreen formulations, including foamable sunscreen formulations, that comprise zinc oxide and titanium dioxide particles, suitably in the size range of about 1-100 nm. The compositions suitably produce a minimal residual whitening effect when applied to a skin surface.
1. A foamable sunscreen formulation consisting essentially of:
a) zinc oxide particles having a primary particle size of about 100 nm to about 500 nm;
b) titanium dioxide particles having a primary particle size of about 100 nm to about 500 nm;
c) about 0.05 wt % to about 15 wt % emulsion stabilizer;
d) about 0.05 wt % to about 25 wt % skin conditioner;
e) about 0.05 wt % to about 20 wt emulsifier;
f) about 0.1 wt % to about 20 wt % suspending agent; and
g) the remainder water,
wherein the formulation produces a minimal residual whitening effect when applied to a skin surface.
2. The foamable sunscreen formulation of claim 1 , wherein the zinc oxide particles are about 1 wt % to about 25 wt % of the formulation.
3. The foamable sunscreen formulation of claim 1 , wherein the titanium dioxide particles are about 1 wt % to about 25 wt % of the formulation.
4. The foamable sunscreen formulation of claim 1 , wherein the emulsion stabilizer is selected from microcrystalline cellulose, cellulose gum, xanthan gum, magnesium aluminum silicate, bentonite clay, hectorite clay, and combination thereof.
5. The foamable sunscreen formulation of claim 1 , wherein the skin conditioner is selected from C 12-15 alkyl benzoate, octyldodecyl neopentanoate, butyl octyl salicylate, caprylyl glycol, glycerin, fatty acid esters of C 8 or greater, mineral oil, a triglyceride, and combination thereof.
6. The foamable sunscreen formulation of claim 1 , wherein the emulsifier is selected from glyceryl stearate, ceteareth-20, polysorbate 80, sodium lauryl sulfate, lecithin, and combination thereof.
7. The foamable sunscreen formulation of claim 1 , wherein the suspending agent is selected from polyhydroxystearic acid, sodium polyacrylate polymer, methyl methacrylate crosspolymer, and combination thereof.
8. The foamable sunscreen formulation of claim 1 , further consisting essentially of iron oxide particles, a film former, or both.
9. A foamable sunscreen formulation consisting essentially of:
a) about 3 wt % to about 20 wt % zinc oxide particles having a primary particle size of about 100 nm to about 500 nm;
b) about 3 wt % to about 20 wt % titanium dioxide particles having a primary particle size of about 100 nm to about 500 nm;
c) about 0.05 wt % to about 10 wt % emulsion stabilizer;
d) about 0.1 wt % to about 25 wt % skin conditioner;
e) about 0.1 wt % to about 20 wt % emulsifier;
f) about 0.1 wt % to about 15 wt % suspending agent; and
g) the remainder water,
wherein the formulation produces a minimal residual whitening effect when applied to a skin surface.
10. The foamable sunscreen formulation of claim 9 , wherein the emulsion stabilizer is selected from microcrystalline cellulose, cellulose gum, xanthan gum, magnesium aluminum silicate, bentonite clay, hectorite clay, and combination thereof.
11. The foamable sunscreen formulation of claim 9 , wherein the skin conditioner is selected from C 12-15 alkyl benzoate, octyldodecyl neopentanoate, butyl octyl salicylate, caprylyl glycol, glycerin, fatty acid esters of C 8 or greater, mineral oil, a triglyceride, and combination thereof.
12. The foamable sunscreen formulation of claim 9 , wherein the emulsifier is selected from glyceryl stearate, ceteareth-20, polysorbate 80, sodium lauryl sulfate, lecithin, and combination thereof.
13. The foamable sunscreen formulation of claim 9 , wherein the suspending agent is selected from polyhydroxystearic acid, sodium polyacrylate polymer, methyl methacrylate crosspolymer, and combination thereof.
14. The foamable sunscreen formulation of claim 9 , further consisting essentially of about 0.01 wt % to about 1 wt % iron oxide particles.
15. The foamable sunscreen formulation of claim 9 , further consisting essentially of a film former.
16. The foamable sunscreen formulation of claim 15 , wherein the film former is selected from polyurethane-2, polymethyl methacrylate, tricontanyl poly(vinyl pyrollidone) (PVP), vinyl pyrollidone/eicosene copolymer, and combination thereof.
17. A foamable sunscreen formulation consisting essentially of:
a) about 3 wt % to about 20 wt % zinc oxide particles having a primary particle size of about 100 nm to about 500 nm;
b) about 3 wt % to about 20 wt % titanium dioxide particles having a primary particle size of about 100 nm to about 500 nm;
c) about 0.05 wt % to about 15 wt % emulsion stabilizer;
d) about 0.05 wt % to about 25 wt % skin conditioner;
e) about 0.05 wt % to about 20 wt % emulsifier;
f) about 0.1 wt % to about 20 wt % suspending agent;
g) about 0.1 wt % to about 20 wt % film former; and
h) the remainder water,
wherein the formulation produces a minimal residual whitening effect when applied to a skin surface.
18. The foamable sunscreen formulation of claim 17 , wherein the skin conditioner comprises butyl octyl salicylate, glycerin, a triglyceride, or a combination thereof.
19. The foamable sunscreen formulation of claim 17 , wherein the suspending agent comprises polyhydroxystearic acid.
20. The foamable sunscreen formulation of claim 17 , wherein the film former comprises vinyl pyrollidone/eicosene copolymer.