Patent ID: 8377313

Claim:
An agglomerate comprising: at least one particle P, which is hydrophobicized on a surface with at least one first surface-active substances and at least one magnetic particle MP, which is hydrophobicized on the surface with at least one second surface-active substance, wherein the at least one first surface-active substance comprises a compound of formula (I) A-Z (I), wherein A is selected from the group consisting of a linear or branched C 3 -C 30 -alkyl, a C 3 -C 30 -heteroalkyl, a substituted C 6 -C 30 -aryl, a substituted C 6 -C 30 -heteroalkyl, and a C 6 -C 30 -aralkyl, and Z is at least one anionic group selected from the group consisting of —(X) n —PO 3 2− , —(X) n —PO 2 S 2− , —(X) n —POS 2 2− , —(X) n —PS 3 2− , —(X) n —PS 2 − , —(X) n —POS − , —(X) n —PO 3 2− —(X) n —CO 2 − , —(X) n —CS 2 − , —(X) n —COS − , —(X) n —C(S)NHOH, and —(X) n —S − , wherein X is selected from the group consisting of O, S, NH, and CH 2 , n=0, 1 or 2, and Z optionally further comprises at least one cation selected from the group consisting of hydrogen, NR 4 + , where the radicals, R, are each, independently of one another, selected from the group consisting of a hydrogen and a C 1 -C 8 -alkyl, an alkali metal, and an alkaline earth metal, and the at least one second surface-active substance comprises a compound of formula (III) B—Y (III), wherein B is selected from the group consisting of a linear or branched C 3 -C 30 -alkyl, a C 3 -C 30 -heteroalkyl, a substituted C 6 -C 30 -aryl, a substituted C 6 -C 30 -heteroalkyl, and a C 6 -C 30 -aralkyl, and Y is a group that binds by means of which the compound of formula (III) to the at least one magnetic particle MP.