Oil-free emollients in sunscreen compositions
AssigneeRohm and Haas Company
InventorsXiaodong Lu, Curtis Schwartz
Life of this patent
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Abstract
Provided are compositions that are useful as oil-free emollients and SPF and UV absorption boosters in sunscreen formulations. The emollients are oil-soluble polyalkylene glycols, wherein the polyalkylene glycol comprises units derived from propylene oxide and units derived from butylene oxide, and in certain embodiments are compounds of Formula I: RO—(PO)n—(BO)m—H (I) wherein PO is propyleneoxy, BO is butyleneoxy, R is a linear or branched C8-C20 alkyl, n has an average value of from 5 to 20, and m has an average value of from 4 to 16.
Claims4
A sunscreen composition comprising:
- (a) an oil-soluble polyalkylene glycol of Formula II:
- wherein R is a linear or branched C8-C12 alkyl, n has an average value of from 5 to 20, and m has an average value of from 4 to 16, wherein the polyalkylene glycol has a number average molecular weight of from 500 to 5,000, and wherein the weight ratio of CH2CH(CH2CH3)O units to CH2CH(CH3)O units ranges from 4:1 to 1:4;
- (b) a dermatologically acceptable carrier, wherein the dermatologically acceptable carrier is selected from the group consisting of oil-in-water emulsions or water-in-oil emulsions;
- and
- (c) a sunscreen active,
- wherein the polyalkylene glycol is present in an amount of from 2 to 10 weight %, based on the total weight of the composition.
A method of protecting skin from UVA and UVB damage comprising topically administering to the skin a composition comprising
- (a) an oil-soluble polyalkylene glycol of Formula II:
- wherein R is a linear or branched C8-C12 alkyl, n has an average value of from 5 to 20, and m has an average value of from 4 to 16, wherein the polyalkylene glycol has a number average molecular weight of from 500 to 5,000, and wherein the weight ratio of CH2CH(CH2CH3)O units to CH2CH(CH3)O units ranges from 4:1 to 1:4,
- (b) a dermatologically acceptable carrier, wherein the dermatologically acceptable carrier is selected from the group consisting of oil-in-water emulsions or water-in-oil emulsions, and
- (c) a sunscreen active,
- wherein the polyalkylene glycol is present in an amount of from 2 to 10 weight %, based on the total weight of the composition.
Dependencies are inferred from the claim text.