27-12-2012 дата публикации
Номер: US20120329888A1
Method of producing a nanoparticle suspension with the steps (i) preparation of an emulsion of a disperse polar phase, where the aqueous phase comprises one or more precursor substances forming the nanoparticles, in a continuous organic phase in the presence of an emulsifier stabilizing the emulsion, (ii) conversion of the one or more precursor substances to nanoparticles in the disperse aqueous phase, (iii) breaking of the emulsion and phase separation, where the nanoparticle suspension is obtained as one phase, (iv) separation off of the nanoparticle suspension, (v) optionally isolation of the nanoparticles from the nanoparticle suspension, wherein the emulsifier is selected from compounds of the general formula (I) in which X is O, NH, Y is C(O), NH, R is a saturated or a mono- or polyunsaturated, linear or branched hydrocarbon radical having 6 to 30 carbon atoms and Ris hydrogen or C-C-alkyl, and Ris a saturated or a mono- or polyunsaturated, linear or branched hydrocarbon radical having 1 to 30 carbon atoms, preferably 6 to 30 carbon atoms, Ris C-C-alkyl, n is 0 or 1, and the breaking of the emulsion is effected by splitting the emulsifier. 3. The method according to claim 1 , wherein the splitting of the emulsifier is effected by adding a base to the emulsion.5. The method according to claim 1 , wherein the splitting is effected by heating the emulsion to a temperature of from 50 to 200° C.6. The method according to claim 1 , wherein the nonpolar phase is a solvent selected from the group consisting of an n-alkane claim 1 , an aromatic hydrocarbon claim 1 , an ether claim 1 , a paraffin claim 1 , a wax claim 1 , a mineral oil and a vegetable oil.9. The method according to claim 7 , wherein the splitting of the emulsifier is carried out by adding a base to the emulsion.1112-. (canceled)16. The method of claim 1 , wherein Ris a saturated or a mono- or polyunsaturated claim 1 , linear or branched hydrocarbon radical having 6 to 30 carbon atoms.17. The method ...
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