Personal care composition
The present invention relates to a personal care composition. More particularly the present invention relates to stabilization of UVA sunscreen dibenzoylmethane derivatives or even more particularly Parsol 1789™ (4-t-butyl-4′-methoxydibenzoylmethane) in personal care compositions. It is an object of the present invention to provide a personal care composition with relatively long photoprotection efficiency. It is another object of the present invention to stabilize Parsol 1789 by use of a natural substance or materials derived from plants. Surprisingly the present inventors have found that theaflavin or black tea extract having high levels of theaflavin, can act as a photostabilizer for dibenzoylmethane derivatives or Parsol-1789™.
1. A personal care composition comprising:
i) a dibenzoylmethane derivative;
ii) 0.1 to 30% by weight theaflavin; and,
iii) a cosmetically acceptable base,
wherein the cosmetically acceptable base is a water-in-oil emulsion.
2. A composition as claimed in claim 1 comprising 0.3 to 10% theaflavin.
3. A composition as claimed in claim 1 wherein the dibenzoylmethane derivative is 4-t-butyl-4′-methoxydibenzoylmethane.
4. A composition as claimed in claim 2 comprising 0.1 to 10% dibenzoylmethane derivative by weight of the composition.
5. A composition as claimed in claim 1 wherein the theaflavin is selected from the group consisting of theaflavin, theaflavin-3-gallate, theaflavin-3′-gallate, theaflavin-3 and 3′-digallate.
6. A composition as claimed in claim 1 comprising an aqueous extract of black tea of the Camellia sinensis species comprising theaflavin.
7. A composition as claimed in claim 6 wherein the aqueous extract of black tea comprises 2 to 15% w/w theaflavin.
8. A composition as claimed in claim 6 comprising 0.1 to 40% aqueous extract of black tea of the Camellia sinensis species.
9. A composition as claimed in claim 1 wherein the weight ratio of dibenzoylmethane derivative to theaflavin is from 10:1 to 1:5.
10. A composition as claimed in claim 1 further comprising para-methoxy cinnamic acid or its derivatives.
11. A composition as claimed in claim 1 comprising 0.1 to 10% w/w of para-methoxy cinnamic acid or its derivatives.
12. A composition as claimed in claim 1 wherein the water-in-oil emulsion comprises a crosslinked silicone elastomer blend.
13. A composition as claimed in claim 1 , wherein the composition provides superior chemical stability of the dibenzoylmethane derivative when exposed to ultraviolet radiation relative to the same composition but without the theaflavin.