IP Library › Granted Patent US 6,964,776
Granted Patent B2
US 6,964,776 · App. 10/412,876 · Granted Nov 15, 2005

Compositions for the treatment of pigmentation disorders and methods for their manufacture

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Quick Facts
Patent No.
US 6,964,776
App. No.
10/412,876
Granted
Nov 15, 2005
Kind
B2
Abstract

The present invention addresses the problem of excessive discoloration in hydroquinone compositions of a neutral pH. Antioxidants in the hydroquinone phase and inorganic or amino acyl cationic salts of acidic ascorbyl esters, preferably sodium metabisulfite and magnesium ascorbyl phosphate respectively, are effective in stabilizing such hydroquinone compositions, which are used in treatment of pigmentation disorders. Protected retinoid may be added to these compositions for additional skin benefit effects.

Claims (59)

1. A skin benefit composition comprising:

hydroquinone;

a cationic salt of acidic ascorbyl esters, and

a protected retinoid,

said compositlon having a pH of about 5.5 to about 8.0.

2. The composition of claim 1 wherein the pH is about 5.5 to about 7.5.

3. The composition of claim 1 wherein the pH is about 6.0 to about 7.5.

4. The composition of claim 1 wherein the hydroquinone is present in about 1 to about 12%.

5. The composition of claim 1 wherein the hydroquinone is present in about 2 to about 10%.

6. The composition of claim 1 wherein the hydroquinone is present in about 2 to about 8%.

7. The composition of claim 1 wherein the hydroquinone is present in about 3 to about 4%.

8. The composition of claim 1 wherein the hydroquinone is present in about 4%.

9. The composition of claim 1 further comprising a water-soluble antioxidant.

10. The composition of claim 9 wherein the antioxidant comprises a sulfite.

11. The composition of claim 10 wherein the antioxidant comprises sodium metabisulfite.

12. The composition of claim 11 wherein the sodium metabisulfite is present in at least about 0.05.

13. The composition of claim 11 wherein the sodium metabisulfite is present at about 0.05% to about 0.5.

14. The composition of claim 1 wherein the cationic salt comprises an inorganic salt.

15. The composition of claim 1 wherein the cationic salt comprises magnesium ascorbyl phosphate.

16. The composition of claim 15 wherein the magnesium ascorbyl phosphate is present in at least about 0.1%.

17. The composition of claim 15 wherein the magnesium ascorbyl phosphate is present at about 0.25 to about 3%.

18. The composition of claim 15 wherein the magnesium ascorbyl phosphate is present at about 0.25 to about 1%.

19. The composition of claim 9 wherein the antioxidant comprises sodium metabisulfite sad the cationic salt comprises magnesium ascorbyl phosphate.

20. The composition of claim 19 wherein the sodium metabisulfite is present in at least about 0.05% and the magnesium ascorbyl phosphate is present in at least about 0.5%.

21. The composition of claim 1 wherein the cationic salt comprises an amino acyl derivative.

22. The composition of claim 21 wherein the cationic salt comprises aminopropyl ascorbyl phosphate.

23. The composition of claim 1 wherein the cationic salt comprises a sodium ascorbyl phosphate.

24. The composition of claim 1 wherein the protected retinoid is protected with a protective system.

25. The composition of claim 1 wherein the protected retinoid comprises at least one of the group consisting of retinoic acid, retinol, retinal, retinoid analogues, isotretoin and its isomers.

26. The composition of claim 1 wherein the retinoid is present from about 0.01% to about 5.0%.

27. The composition of claim 1 wherein the retinoid is present from about 0.025% to about 2.0%.

28. The composition of claim 1 wherein the retinoid is present from about 0.05% to about 1.0%.

29. The composition of claim 1 wherein the retinoid is present from about 0.025% to about 0.5%.

30. A skin benefit composition comprising:

hydroquinone;

a protected retinoid,

said composition having a pH of about 5.5 to about 8.0.

31. The composition of claim 30 wherein the pH is about 5.5 to about 7.5.

32. The composition of claim 30 wherein the pH is about 6.0 to about 7.5.

33. The composition of claim 30 wherein the hydroquinone is present at about 1 to about 12%.

34. The composition of claim 30 wherein the hydroquinone is present at about 2 to about 10%.

35. The composition of claim 30 wherein the hydroquinone is present at about 2 to about 8%.

36. The composition of claim 30 wherein the hydroquinone is present at about 3 to about 4%.

37. The composition of claim 30 wherein the hydroquinone is present at about 4%.

38. The composition of claim 30 further comprising a water-soluble antioxidant.

39. The composition of claim 38 wherein the antioxidant comprises a sulfite.

40. The composition of claim 34 wherein the antioxidant comprises sodium metabisulfite.

41. The composition of claim 40 wherein the sodium metabisulfite is present in at least about 0.05%.

42. The composition of claim 40 wherein the sodium metabisulfite is present at about 0.05% to about 0.5%.

43. The composition of claim 30 wherein the protected retinoid is protected with a protective system.

44. The Composition of claim 30 wherein the protected retinoid comprises at least one of the group consisting of retinoic acid, retinol, retinal, retinoid analogues, isotretoin and its isomers.

45. The composition of claim 30 wherein the retinoid is present at about 0.01 to about 5.0%.

46. The composition of claim 30 wherein the retinoid is present at about 0.025 to about 2.0%.

47. The composition of claim 30 wherein the retinoid is present at about 0.05 to about 1.0%.

48. The composition of claim 30 wherein the retinoid is present at about 0.025 to about 0.5%.

49. A composition for the treatment of pigmentation disorders, said composition having a neutral pH, comprising:

4% hydroquinone;

at least about 0.1% sodium metabisulfite; and

a protected retinoid.