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 comprising consisting essentially of:
a) about 1 wt % to about 25 wt % zinc oxide particles having a primary particle size of about 5 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 , comprising about 10 wt % to about 15 wt % zinc oxide particles.
3. The foamable sunscreen formulation of claim 1 , comprising zinc oxide particles having 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, 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, 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 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.
9. The foamable sunscreen formulation of claim 1 , further consisting essentially of about 0.01 wt % to about 1 wt % iron oxide particles.
10. The foamable sunscreen formulation of claim 1 , wherein the zinc oxide particles have a primary particle size of about 10 nm to about 100 nm.
11. A foamable sunscreen formulation consisting essentially of:
a) about 1 wt % to about 25 wt % active particles having a primary particle size of about 5 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.
12. The foamable sunscreen formulation of claim 11 , wherein the wt % of active particles is about 10 wt % to about 15 wt %.
13. The foamable sunscreen formulation of claim 11 , wherein the active particles have a primary particle size of about 10 nm to about 200 nm.
14. The foamable sunscreen formulation of claim 11 , wherein the emulsion stabilizer is selected from the group consisting of microcrystalline cellulose, cellulose gum, and combinations thereof.
15. The foamable sunscreen formulation of claim 11 , 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.
16. The foamable sunscreen formulation of claim 11 , wherein the emulsifier is selected from the group consisting of glyceryl stearate, ceteareth-20, polysorbate 80, and combinations thereof.
17. The foamable sunscreen formulation of claim 11 , wherein the suspending agent is selected from the group consisting of polyhydroxystearic acid, methyl methacrylate crosspolymer, and combinations thereof.
18. The foamable sunscreen formulation of claim 11 , 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.
19. The foamable sunscreen formulation of claim 11 , further consisting essentially of about 0.01 wt % to about 1 wt % iron oxide particles.
20. The foamable sunscreen formulation of claim 11 , wherein the active particles have a primary particle size of about 10 nm to about 100 nm.
21. A foamable sunscreen formulation comprising:
a) about 1 wt % to about 25 wt % zinc oxide particles having a primary particle size of about 5 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
i) about 50 wt % to about 60 wt % water, wherein the formulation produces a minimal residual whitening effect when applied to a skin surface.
22. The foamable sunscreen formulation of claim 21 , further comprising about 0.01 wt % to about 1 wt % iron oxide particles.