Metal oxide particles aftertreated with organic phosphorus compounds
The invention relates to metal oxide particles and/or metal hydroxide particles, aftertreated with an organic phosphorus compound, process for the preparation thereof, and compositions comprising same.
1. Metal oxide particles and/or metal hydroxide particles having a primary particle size according to the Scherrer method in the range from 5 nm to 100 nm, aftertreated with an organic phosphorus compound selected from phosphoric acid monoalkyl esters or salts thereof.
2. Particles according to claim 1 , wherein the organic phosphorus compound is applied in an amount of 5 to 20 per cent by weight.
3. Particles according to claim 1 , wherein the metal oxide and/or hydroxide is selected from the group of the oxides and hydroxides of silicon, titanium, zinc, aluminium, cerium, iron, yttrium or zirconium or mixtures thereof.
4. Particles according to claim 1 , wherein the metal oxide and/or hydroxide is selected from the group of the oxides and hydroxides of titanium or mixtures thereof.
5. Particles according to claim 1 , wherein, before the aftertreatment with an organic phosphorus compound, at least one further coating is applied comprising: metal oxides or hydroxides of silicon, titanium, zinc, aluminium, cerium, iron, yttrium, manganese or zirconium, where the metal is selected differently to the metal of the base particle; organic acids selected from the group stearic acid, lauric acid, caproic acid or palmitic acid; polyols; polymers; or organosilicone compounds.
6. A process for the production of particles according to claim 1 , wherein a stirrable dispersion of a metal oxide base body and/or a metal hydroxide base body, to which at least one further coating has optionally been applied, is heated, the organic phosphorus compound is added and, when the aftertreatment is complete, is optionally washed and dried.
7. A composition comprising particles according to claim 1 .
8. A composition according to claim 7 , which is an aqueous or oily dispersion.
9. A composition according to claim 7 , which is a composition which can be applied topically.
10. A composition according to claim 7 , which is a composition selected from a fiber composition, a textile composition, a textile coating composition, a paint composition, a coating system composition, or a film or packaging composition.
11. A composition according to claim 7 , wherein the composition further comprises dihydroxyacetone or a dihydroxyacetone derivative.
12. A composition according to claim 11 , wherein the concentration of dihydroxyacetone or the dihydroxyacetone derivative is in the range from 1 to 12 per cent by weight, based on the composition.
13. A composition according to claim 7 , wherein the composition further comprises at least one organic UV filter.
14. Process for the preparation of a composition according to claim 7 , wherein the particles are mixed with a cosmetically or dermatologically suitable carrier and optionally further ingredients.
15. Particles according to claim 2 , wherein the metal oxide particles and/or metal hydroxide particles are titanium dioxide particles.
16. The composition according to claim 7 , wherein the metal oxide particles and/or metal hydroxide particles are titanium dioxide particles.
17. Particles according to claim 1 , wherein the organic phosphorus compound comprises a phosphoric acid monoalkyl ester selected from phosphoric acid monomethyl ester, phosphoric acid monoethyl ester, phosphoric acid monooctyl ester, phosphoric acid monocetyl ester, phosphoric acid monostearyl ester or phosphoric acid monododecyl ester or salts thereof or mixtures thereof.
18. Particles according to claim 1 , wherein the organic phosphorus compound comprises phosphoric acid monocetyl ester.
19. Particles according to claim 1 , wherein the metal oxide particles and/or metal hydroxide particles are titanium dioxide particles and the organic phosphorus compound comprises a phosphoric acid monoalkyl ester selected from phosphoric acid monomethyl ester, phosphoric acid monoethyl ester, phosphoric acid monooctyl ester, phosphoric acid monocetyl ester, phosphoric acid monostearyl ester or phosphoric acid monododecyl ester or salts thereof or mixtures thereof.
20. Particles according to claim 5 , wherein the metal oxide particles and/or metal hydroxide particles are titanium dioxide particles having a coating of silicon dioxide before the aftertreatment and wherein the organic phosphorus compound for aftertreatment is phosphoric acid monocetyl ester.