Foamable 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. about 1 wt % to about 25 wt % titanium dioxide particles having a primary particle size of about 10 nm to about 500 nm;
b. about 0.1 wt % to about 10 wt % emulsion stabilizer;
c. about 0.1 wt % to about 25 wt % skin conditioner;
d. about 1 wt % to about 10 wt % emulsifier;
e. about 0.1 wt % to about 10 wt % suspending agent; and
f. 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 wt % of titanium dioxide particles is about 1 wt % to about 10 wt %.
3. The foamable sunscreen formulation of claim 1 , wherein the titanium dioxide particles have a primary particle size of about 10 nm to about 200 nm.
4. The foamable sunscreen formulation of claim 1 , wherein the emulsion stabilizer is selected from the group consisting of microcrystalline cellulose, cellulose gum, xanthan gum, magnesium aluminum silicate and combinations thereof.
5. The foamable sunscreen formulation of claim 1 , wherein the skin conditioner is selected from the group consisting of C 12-15 alkyl benzoate, octyldodecyl neopentanoate, butyl octyl salicylate, caprylyl glycol, glycerin, fatty acid esters of C 8 or greater and combinations thereof.
6. The foamable sunscreen formulation of claim 1 , wherein the emulsifier is selected from the group consisting of glyceryl stearate, ceteareth-20, polysorbate 80, and combinations thereof.
7. The foamable sunscreen formulation of claim 1 , wherein the suspending agent is selected from the group consisting of polyhydroxystearic acid, methyl methacrylate crosspolymer and combinations thereof.
8. The foamable sunscreen formulation of claim 1 , further comprising about 0.5 wt % to about 3 wt % film former, wherein the film former is selected from the group consisting of polyurethane-2, polymethyl methacrylate, tricontanyl poly(vinyl pyrollidone) (PVP), VP/eicosene copolymer, Alkyl Acrylate/methacrylate copolymer, Acrylates C12-22 Alkyl methacrylate copolymer and combinations thereof.
9. The foamable sunscreen formulation of claim 1 , further consisting essentially of about 0.01 wt % to about 1 wt % iron oxide particles.
10. A sunscreen formulation consisting essentially of:
a. about 1 wt % to about 25 wt % active particles having a primary particle size of about 10 nm to about 500 nm;
b. about 0.1 wt % to about 10 wt % emulsion stabilizer;
c. about 0.1 wt % to about 25 wt % skin conditioner;
d. about 1 wt % to about 10 wt % emulsifier;
e. about 0.1 wt % to about 10 wt % suspending agent;
f. optionally about 0.01 wt % to about 0.1 wt % iron oxide particles; and
g. the remainder water, wherein the formulation produces a minimal residual whitening effect when applied to a skin surface.
11. The sunscreen formulation of claim 10 , wherein the wt % of active particles is about 1 wt % to about 10 wt %.
12. The sunscreen formulation of claim 10 , wherein the active particles have a primary particle size of about 10 nm to about 200 nm.
13. The sunscreen formulation of claim 10 , wherein the emulsion stabilizer is selected from the group consisting of microcrystalline cellulose, cellulose gum, and combinations thereof.
14. The sunscreen formulation of claim 10 , wherein the skin conditioner is selected from the group consisting of C 12-15 alkyl benzoate, octyldodecyl neopentanoate, butyl octyl salicylate, caprylyl glycol, glycerin, and combinations thereof.
15. The sunscreen formulation of claim 10 , wherein the emulsifier is selected from the group consisting of glyceryl stearate, ceteareth-20, polysorbate 80, and combinations thereof.
16. The sunscreen formulation of claim 10 , wherein the suspending agent is selected from the group consisting of polyhydroxystearic acid, methyl methacrylate crosspolymer, and combinations thereof.
17. The sunscreen formulation of claim 10 , further consisting essentially of about 0.5 wt % to about 3 wt % film former, wherein the film former is selected from the group consisting of polyurethane-2, polymethyl methacrylate, tricontanyl poly(vinyl pyrollidone) (PVP), and combinations thereof.
18. The sunscreen formulation of claim 10 , further consisting essentially of about 0.01 wt % to about 1 wt % iron oxide particles.
19. A foamable sunscreen formulation comprising:
a. about 1 wt % to about 25 wt % titanium dioxide particles having a primary particle size of about 10 nm to about 500 nm;
b. about 0.1 wt % to about 5 wt % microcrystalline cellulose and about 0.1 wt % to about 5 wt % cellulose gum;
c. about 15 wt % to about 20 wt % C 12-15 alkyl benzoate, about 0.1 wt % to about 5 wt % octyldodecyl neopentanoate, and about 0.1 wt % to about 5 wt % butyl octyl salicylate;
d. about 0.1 wt % to about 5 wt % glyceryl stearate, about 0.1 wt % to about 5 wt % ceteareth-20, and about 0.1 wt % to about 5 wt % polysorbate 80;
e. about 0.1 wt % to about 5 wt % polyhydroxystearic acid and about 0.1 wt % to about 5 wt % methyl methacrylate crosspolymer;
f. about 0.1 wt % to about 3 wt % polyurethane-2, about 0.1 wt % to about 3 wt % polymethyl methacrylate, and about 0.1 wt % to about 3 wt % tricontanyl PVP film; and
g. about 50 wt % to about 60 wt % water, wherein the formulation produces a minimal residual whitening effect when applied to a skin surface.
20. The foamable sunscreen formulation of claim 19 , further comprising about 0.01 wt % to about 1 wt % iron oxide particles.
21. A sunscreen formulation consisting essentially of:
a. about 1 wt % to about 25 wt % active particles having a primary particle size of about 10 nm to about 500 nm;
b. about 0.1 wt % to about 10 wt % emulsion stabilizer;
c. about 0.1 wt % to about 25 wt % skin conditioner;
d. about 1 wt % to about 10 wt % emulsifier;
e. about 0.1 wt % to about 10 wt % suspending agent; and
f. the remainder water.
22. The sunscreen formulation of claim 21 , wherein the wt % of active particles is about 10 wt % to about 25 wt %.
23. The sunscreen formulation of claim 21 , wherein the active particles have a primary particle size of about 100 nm to about 500 nm.
24. The sunscreen formulation of claim 21 , wherein the emulsion stabilizer is xanthan gum.
25. The sunscreen formulation of claim 21 , wherein the skin conditioner is selected from the group consisting of octyldodecyl neopentanoate, butyl octyl salicylate, caprylyl glycol, glycerin, and combinations thereof.
26. The sunscreen formulation of claim 21 , further consisting essentially of about 0.5 wt % to about 3 wt % film former, wherein the film former is selected from the group consisting of polyurethane-2, polymethyl methacrylate, tricontanyl poly(vinyl pyrollidone) (PVP), vinyl pyrollidone/eicosene copolymer, and combinations thereof.