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1. (WO1990006103) PROTECTIONS SOLAIRES AU DIOXYDE DE TITANE
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C laims

1. Titanium dioxide particles having a mean primary particle size of less than 100nm, each of said particles being substantially coated with phospholipid.

2. Particles as claimed in claim 1 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols, diphosphatidyl glycerols, sphingomyelins and mixtures thereof.

3. Particles as claimed in claim 1 wherein the phospholipid is a synthetic phospholipid or a modified natural phospholipid.

4. Particles as claimed in claim 1 wherein the phospholipid carries two C8-32 alkyl groups bound toa phosphorylated alcohol.

5. Particles as claimed in claim 1 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols and mixtures thereof.

6. Particles as claimed in claim 1 wherein the phospholipid is lecithin.

7. Titanium dioxide particles having a mean primary particle size of less than 100nm, each of said particles being substantially coated with phospholipid and wherein the ratio of phospholipid to titanium dioxide on a weight:weight basis is in the range of 0.1:100 to 15:100.

8. Particles as claimed in claim 7 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols, diphosphatidyl glycerols, sphingomyelins and mixtures thereof.

9. Particles as claimed in claim 7 wherein the phospholipid is a synthetic phospholipid or a modified natural phospholipid.

10. Particles as claimed in claim 7 wherein the phospholipid carries two C8-32 alkyl groups bound to a phosphorylated alcohol.

11. Particles as claimed in claim 7 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols and mixtures thereof.

12. Particles as claimed in claim 7 wherein the phospholipid is lecithin,

13. A sunscreen composition which comprises 0.5 to 50% by weight of titanium dioxide particles as claimed in claim 1, together with a cosmetically acceptable carrier.

14. A sunscreen composition as claimed in claim 13 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols, diphosphatidyl glycerols, sphingomyelins and mixtures thereof.

15. A sunscreen composition as claimed in claim 13 wherein the phospholipid is a synthetic phospholipid or a modified natural phospholipid.

16. A sunscreen composition as claimed in claim 13 wherein the phospholipid carries two C8-32 alkyl groups bound to a phosphorylated alcohol.

17. A sunscreen composition as claimed in claim 13 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols and mixtures thereof.

18. A sunscreen composition as claimed in claim 13 wherein the phospholipid is lecithin.

19. A sunscreen composition as claimed in claim 13 wherein the ratio of phospholipid to titanium dioxide on a weight:weight basis is in the range of 0.1:100 to 15:100.

20. A sunscreen composition as claimed in claim 1 3 comprising a water-in-oil emulsion which comprises: a) 0.5 to 30% by weight of titanium dioxide particles as claimed in claim 1;
b) 5 to 50% by weight of an oil phase;
c) 1 to 15% by weight of an emulsifier; and
d) at least 40% by weight of an aqueous phase.

21. A sunscreen composition as claimed in claim 20 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols, diphosphatidyl glycerols, sphingomyelins and mixtures thereof.

22. A sunscreen composition as claimed in claim 20 wherein the phospholipid is a synthetic phospholipid or a modified natural phospholipid.

23. A sunscreen composition as claimed in claim 20 wherein the phospholipid carries two C8-32 alkyl groups bound to a phosphorylated alcohol.

24. A sunscreen composition as claimed in claim 20 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols and mixtures thereof.

25. A sunscreen composition as claimed in claim 20 wherein the phospholipid is lecithin.

26. A sunscreen composition as claimed in claim 20 wherein the ratio of phospholipid to titanium dioxide on a weight:weight basis is in the range of 0.1:100 to 15:100.

27. A sunscreen composition as claimed in claim 20 comprising a water-in-oil emulsion which comprises: (a) 2.5 to 15% by weight of titanium dioxide particles as claimed in claim 1;
(b) 10 to 30% by weight of an oil phase;

(c) 2 to 10% by weight of an emulsifier;

(d) at least 40% by weight of an aqueous phase.

28. A sunscreen composition as claimed in claim 13 comprising an oil-in-water emulsion which comprises: a) 0.5 to 30% by weight of titanium dioxide particles as claimed in claim 1;
b) 5 to 40% by weight of an oil phase;
c) 1 to 20% by weight of an emulsifier; and
d) at least 50% by weight of an aqueous phase.

29. A sunscreen composition as claimed in claim 28 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols, diphosphatidyl glycerols, sphingomyelins and mixtures thereof.

30. A sunscreen composition as claimed in claim 28 wherein the phospholipid is a synthetic phospholipid or a modified natural phospholipid.

31. A sunscreen composition as claimed in claim 28 wherein the phospholipid carries two C8-32 alkyl groups bound to a phosphorylated alcohol.

32. A sunscreen composition as claimed in claim 28 wherein the phospholipid is selected from phosphatidyl cholines, phosphatidyl ethanolamines, phosphatidyl serines, phosphatidyl inositols and mixtures thereof.

33. A sunscreen composition as claimed in claim 28 wherein the phospholipid is lecithin.

34. A sunscreen composition as claimed in claim 28 wherein the ratio of phospholipid to titanium dioxide on a weight:weight basis is in the range of 0.1:100 to 15:100.

35. A sunscreen composition as claimed in claim 28 comprising an oil-in-water emulsion which comprises:

(a) 2.5 to 15% by weight of titanium dioxide particles as claimed in claim 1;
(b) 10 to 20% by weight of an oil phase;
(c) 2 to 15% by weight of an emulsifier;
(d) at least 50% by weight of an aqueous phase.

36. A sunscreen composition as claimed in claim 13 which comprises 20 to 50% by weight of titanium dioxide particles as claimed in claim 1 in an oil phase dispersion.