SUNSCREEN FORMULATION
The present invention relates generally to sun protection compositions for application to the skin, and in particular sunscreen formulations comprising zinc oxide and other components in a water-in-silicone/oil inverted emulsion system.
1 .- 63 . (canceled)
64 . A sunscreen formulation having a SPF rating of at least 50, wherein the formulation comprises:
not more than 25 wt % of one or more zinc oxides, based on a total weight of the sunscreen formulation, the one or more zinc oxides being surface-treated;
one or more film formers; and
one or more SPF boosters,
and wherein the sunscreen formulation does not comprise any organic sunscreen active ingredients.
65 . The sunscreen formulation of claim 64 , wherein the one or more zinc oxides comprises at least one zinc oxide surface-treated with an ethoxylated alkyl silane.
66 . The sunscreen formulation of claim 65 , wherein the surface-treated zinc oxide comprises at least one zinc oxide surface-treated with triethoxycaprylylsilane.
67 . The sunscreen formulation of claim 64 , wherein the one or more surface-treated zinc oxides comprise a first zinc oxide surface-treated with an ethoxylated alkylsilane.
68 . The sunscreen formulation of claim 67 , wherein the first zinc oxide is surface-treated with triethoxycaprylylsilane and has a first weight ratio of zinc oxide to triethoxycaprylylsilane of about 96.2:3.8.
69 . The sunscreen formulation of claim 67 , wherein the first zinc oxide is surface-treated with triethoxycaprylylsilane and has a first median particle size (D50) of about 1790 nm.
70 . The sunscreen formulation of claim 67 , wherein the first zinc oxide is present in an amount of about 25 wt % based on the total weight of the sunscreen formulation.
71 . The sunscreen formulation of claim 67 , wherein the one or more surface-treated zinc oxides further comprise a second zinc oxide surface-treated with an ethoxylated alkylsilane.
72 . The sunscreen formulation of claim 71 , wherein the second zinc oxide is surface-treated with triethoxycaprylylsilane and has a second weight ratio of zinc oxide to triethoxycaprylylsilane of about 96.6:3.3.
73 . The sunscreen formulation of claim 71 , wherein the second zinc oxide surface-treated with triethoxycaprylylsilane has a second median particle size (D50) of about 2880 nm.
74 . The sunscreen formulation of claim 71 , wherein the first zinc oxide is present in an amount of about 18 wt % and the second zinc oxide is present in an amount of about 7 wt % based on the total weight of the sunscreen formulation.
75 . The sunscreen formulation of claim 64 , wherein the one or more film formers comprise bis-octyldodecyl dimer dilinoleate/propanediol copolymer.
76 . The sunscreen formulation of claim 64 , wherein the one or more film formers comprise octyldodecyl/glyceryl hydroxy stearate dilinoleate dimethicone copolymer.
77 . The sunscreen formulation of claim 64 , wherein the one or more film formers comprise bis-octyldodecyl dimer dilinoleate/propanediol copolymer and octyldodecyl/glyceryl hydroxy stearate dilinoleate dimethicone copolymer.
78 . The sunscreen formulation of claim 64 , wherein the one or more film formers are present in an amount of from about 0.1 to 60 wt % based on the total weight of the sunscreen formulation.
79 . The sunscreen formulation of claim 64 , wherein the one or more SPF boosters comprise butyloctyl salicylate.
80 . The sunscreen formulation of claim 64 , wherein the one or more SPF boosters comprise ethylhexyl methoxycrylene.
81 . The sunscreen formulation of claim 64 , wherein the one or more SPF boosters comprise butyloctyl salicylate and ethylhexyl methoxycrylene.
82 . A sunscreen formulation, wherein the formulation comprises:
at least one zinc oxide surface-treated with triethoxycaprylylsilane;
bis-octyldodecyl dimer dilinoleate/propanediol copolymer;
octyldodecyl/glyceryl hydroxy stearate dilinoleate dimethicone copolymer; and
at least one SPF booster
and wherein the sunscreen formulation is a water-in-silicone/oil inverted emulsion, and contains not more than 25 wt % zinc oxide based on the total weight of the sunscreen formulation.
83 . A water-in-silicone/oil inverted emulsion, wherein the formulation comprises:
not more than 25 wt % zinc oxide based on a total weight of the emulsion, wherein the zinc oxide is surface treated;
one or more film formers; and
one or more SPF boosters,
and wherein the inverted emulsion does not comprise any organic sunscreen active ingredients.