Metal oxide formulations

• US 20060239941A1
• Filed: 07/05/2004
• Published: 10/26/2006
• Est. Priority Date: 07/03/2003
• Status: Abandoned Application

• Current Assignee: Oxonica Limited
• Original Assignee: Oxonica Limited
• Inventors: Park, George Barry, Knowland, John, Flutter, Barry
• Application Number:
  US10/563,062
• Publication Number:
  US 20060239941A1
• Time in Patent Office: Days
• US Class Current: 424/59
• CPC Class Codes: A61K 8/19 containing inorganic ingredients
• CPC Class Codes: A61K 8/27 Zinc; Compounds thereof
• CPC Class Codes: A61K 8/29 Titanium; Compounds thereof
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C09D 5/32 Radiation-absorbing paints protection against X-, gamma- or corpuscular radiation G21F
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: C09D 7/68 Particle size between 100-1000 nm
• CPC Class Codes: D06M 11/44 Oxides or hydroxides of elements of Groups 2 or 12 of the Periodic Table; Zincates; Cadmates
• CPC Class Codes: D06M 11/46 Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
• CPC Class Codes: D06M 2200/25 Resistance to light or sun, i.e. protection of the textile itself as well as UV shielding materials or treatment compositions therefor; Anti-yellowing treatments
• CPC Class Codes: G03C 1/815 characterised by means for filtering or absorbing ultraviolet light, e.g. optical bleaching for photoprinting G03C5/10; for intensifying X-ray images G03C5/17

Abstract

A composition is described which comprises an ingredient which is adversely affected by the presence of TiO₂ and/or ZnO, and TiO₂ and/or ZnO which has been doped with another element and/or reduced ZnO.

Claims

1. A composition which comprises an ingredient which is adversely affected by UV light in the presence of TiO₂ and/or ZnO, and TiO₂ and/or ZnO which has been doped with another element and/or reduced ZnO.

2. A composition according to claim 1 which contains TiO₂ and/or ZnO which has not been doped or reduced.

3. A composition according to claim 1 wherein the dopant is manganese, vanadium, chromium or iron.

4. A composition according to claim 3 wherein the dopant is Mn³⁺.

5. A composition according to claim 1 wherein the dopant is present in an amount from 0.05% to 10 mole %.

6. A composition according to claim 5 wherein the dopant is present in an amount from 0.5 to 2 mole % by weight.

7. A composition according to claim 1 which comprises doped titanium dioxide.

8. A composition according to claim 1 wherein the titanium dioxide is in rutile form.

9. A composition according to claim 1 which comprises reduced zinc oxide.

10. A composition according to claim 1 wherein doped and/or undoped TiO₂ and/or ZnO therein is coated with an inorganic or organic coating.

11. A composition according to claim 1 which comprises 0.5 to 20 mole % by weight of the doped TiO₂ or ZnO or reduced ZnO.

12. A composition according to claim 1 wherein the doped or reduced oxide has a particle size from 1 to 200 nm.

13. A composition according to claim 1 wherein the doped or reduced oxide has a particle size from 100 to 500 nm.

14. A composition according to claim 1 which is a UV sunscreen composition.

15. A composition according to claim 1 which is suitable for cosmetic use.

16. A composition according to claim 14 having a rate of loss of UV absorption at least 5% less than that of a composition having the same formulation except that it does not contain the said TiO₂ and/or ZnO which has been doped with another element or the said reduced zinc oxide.

17. A composition according to claim 1 which contains a UV sunscreen agent which is adversely affected by TiO₂ and/or ZnO.

18. A composition according to claim 14 wherein the UV sunscreen composition includes an organic sunscreen agent that is a paraminobenzoic acid, ester or derivative thereof, a methoxy cinnamate ester, a benzophenone, a dibenzylomethane, an alkyl-β

,β

-phenyl acrylate, a triazine, a camphor derivative, an organic pigment, a silicone based sunscreen agent or 2-phenylbenzimdazoyl-5 sulphonic acid or phenyldibenzimidazoyl sulphonic acid.

19. A composition according to claim 16 wherein the rate of change of the ratio of the loss of UVA absorption to the loss of UVB absorption is less than that of a composition of the same formulation except that the TiO₂ and/or ZnO present is not doped.

20. A composition according to claim 19 wherein the rate of change of the ratio is greater because the rate of loss of UVA absorption is reduced.

21. A composition according to claim 14 which comprises 0.1% to 20% by weight of organic sunscreen agent(s).

22. A composition according to claim 14 which contains one or more of a fatty substance, organic solvent, silicone, thickener, demulcent, UVB sunscreen agent, antifoaming agent, moisturising agent, perfume preservative, surface activation filler, sequestrant, anionic, cationic, nonionic or amphoteric polymer, propellant, alkalising or acidifying agent, colorant, metal oxide pigment, vitamin, antioxidant, anti-ageing factor and stabilizer.

23. A composition according to claim 14 which is a sunscreen.

24. A composition according to claim 14 which is in the form of a lotion, gel, dispersion, cream, milk, powder or solid stick.

25. A composition according to claim 23 which comprises a water-dispersible and an oil-dispersible TiO₂ and/or ZnO.

26. A composition according to claim 1 which is a polymeric composition.

27. A composition according to claim 26 wherein the ingredient which is adversely affected by TiO₂ and/or ZnO suffers a change in physical properties.

28. A composition according to claim 27 wherein the physical property is tensile strength.

29. A composition according to of claim 27 wherein the physical property is colour.

30. A composition according to claim 26 wherein the polymeric composition is thermoplastic.

31. A composition according to claim 26 wherein the polymeric composition is thermosetting.

32. A composition according to claim 26 which is in the form of a three dimensional article.

33. A composition according to claim 26 which is in the form of a film.

34. A composition according to claim 33 which is in the form of a photographic film.

35. A composition according to claim 26 which is in the form of a coating composition.

36. A composition according to claim 35 which is in the form of a paint or varnish.

37. A composition according to claim 1 wherein the ingredient which is adversely affected by TiO₂ and/or ZnO is an ethylenically unsaturated compound or one possessing a labile hydrogen atom.

39. A method to reduce the concentration of one or more organic UV sunscreen agents adversely affected by TiO₂ and/or ZnO in a cosmetic UV screening composition, comprising incorporating into the composition a doped or reduced TiO₂/ZnO as defined in claim 1.

40. A method to reduce the rate of loss in UV absorption of a sunscreen composition containing an organic UV sunscreen agent which is adversely affected by TiO₂ and/or ZnO, comprising incorporating into the composition a doped or reduced TiO₂/ZnO as defined in claim 1.

41. A method of increasing the effectiveness of an organic UV sunscreen composition which comprises one or more components which are degraded by TiO₂ and/or ZnO which comprises incorporating into the composition a doped or reduced TiO₂/ZnO as defined in claim 1.

42. A method of increasing the UV spectrum of a sunscreen formulation which comprises an organic sunscreen agent which is adversely affected by TiO₂ and/or ZnO which comprises incorporating in the formulation doped TiO₂ and/or doped or reduced ZnO as defined in claim 1.

43. A method of reducing the production of a toxic compound in a UV sunscreen composition which contains an ingredient which produces a toxic compound due to the presence of TiO₂ and/or ZnO which comprises incorporating therein doped TiO₂ and/or doped or reduced ZnO as defined in claim 1.

44. A method of reducing the adverse effects of TiO₂ and/or ZnO on one or more components of a composition which comprises incorporating in the composition a doped or reduced TiO₂/ZnO as defined in claim 1.

38. (canceled)