Sunscreen Composition

• US 20110171148A1
• Filed: 09/18/2009
• Published: 07/14/2011
• Est. Priority Date: 09/25/2008
• Status: Active Grant

• Current Assignee: Croda International PLC
• Original Assignee: Croda International PLC
• Inventors: Jones, Debra Louise
• Granted Patent: US 9,849,074 B2
• Time in Patent Office: Days
• US Class Current: 424/59
• CPC Class Codes: A61K 2800/413 Nanosized, i.e. having sizes below 100 nm
• CPC Class Codes: A61K 8/29 Titanium; Compounds thereof
• CPC Class Codes: A61K 8/8182 Copolymers of vinyl-pyrrolidones. Compositions of derivatives of such polymers
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: B82Y 5/00 Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery

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.

Claims

1. A composition comprising at least one sunscreen and a protein-PVP copolymer.

2. The composition according to claim 1 comprising 0.05 to 5% by weight of protein-PVP copolymer.

3. The composition according to claim 1 comprising 1 to 40% by weight of sunscreen.

4. The composition according to claim 1 wherein the ratio of protein to PVP in the protein-PVP copolymer is 5 to 70:

30 to 95% by weight.

5. The composition according to claim 1 in the form of an emulsion comprising an oil phase and an aqueous phase.

6. The composition according to claim 5 wherein the oil phase comprises 1 to 30% by weight of sunscreen based on the total composition.

7. The composition according to claim 5 wherein the oil phase comprises 2 to 20% by weight of metal oxide.

8. The composition according to claim 1 wherein the sunscreen comprises titanium dioxide particles having a median volume particle diameter of 24 to 42 nm.

9. The composition according to claim 5 wherein the oil phase comprises 1 to 20% by weight of organic sunscreen.

10. The composition according to claim 9 wherein the organic sunscreen is selected from the group consisting of butyl methoxydibenzoylmethane, ethylhexyl methoxycinnamate, octocrylene, and mixtures thereof.

11. The composition according to claim 1 wherein the increase in the SPF value due to the presence of the protein-PVP copolymer is greater than 20%.

12. The composition according to claim 11 wherein the SPF increase is obtainable at a concentration of 0.4% by weight of protein-PVP copolymer.

13. An emulsion comprising an oil phase comprising at least one sunscreen, and an aqueous phase comprising a protein-PVP copolymer.

14. The use of a protein-PVP copolymer to improve the effectiveness of at least one sunscreen.

15. The use according to claim 14 wherein the sunscreen comprises titanium dioxide.