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US 9,849,074 B2Granted
Sunscreen composition
AssigneeCroda International PLC
InventorDebra Louise Jones
Life of this patent
Estimating the term…
Abstract
A composition contains at least one sunscreen and a protein-PVP copolymer. The sunscreen may be organic and/or inorganic, particularly titanium dioxide. The protein-PVP copolymer improves the effectiveness of the sunscreen, resulting in increased SPF values of the composition.
Claims16
A sunscreen emulsion composition, comprising:
- i) an oil phase comprising at least one of:
- a) 1-20 wt. % of an organic sunscreen, based on the total weight of the sunscreen emulsion composition;
- and
- b) 2-12 wt. % of titanium dioxide particles, based on the total weight of the sunscreen emulsion composition, wherein said titanium dioxide particles have a hydrophobic coating and have a median volume particle diameter of 24 to 42 nm;
- and
- ii) an aqueous phase comprising 0.2-1 wt. %, based on the total weight of the sunscreen emulsion composition, of a protein-polyvinylpyrrolidone (PVP) copolymer having a protein to PVP ratio in the range of 5-70:30-95 wt. %;
- wherein the sunscreen emulsion composition:
- 1) has an SPF value of greater than 10;
- and
- 2) has an increase in SPF value of greater than 8% per 0.1 wt. % of protein-PVP copolymer present in said sunscreen emulsion composition, relative to said sunscreen emulsion composition exclusive of the protein-PVP copolymer.
7 more elements
Dependencies are inferred from the claim text.