1. A composition comprising one amphiphile and one active substance which is soluble in water at 20 ° C for at most 10 g / l, characterized in that the amphiphile contains dendritic polyurea, which is connected with at least one linear or comb polymer and the connection is through a bifunctional linker, if the linear polymer made up of repeating units polymerized alkylene oxide.2. The composition of claim 1, wherein the polymer is a lineara) a homopolymer or random copolymer containing the polar, ethylenically unsaturated monomer,b) a block polymer containing a block of polyethylene or on the basis of a polar, ethylenically unsaturated monomer, orc) a polycondensate containing polyethylene glycol, org) polyethylene glycol,wherein the polyethylene glycol d) is connected via a bifunctional linker with a polyurea.3. The composition of claim 1, wherein the polymer is a lineara) a homopolymer or random copolymer containing the polar, ethylenically unsaturated monomer,b) a block polymer containing a block of polyethylene or on the basis of a polar, ethylenically unsaturated monomer, orc) a polycondensate containing polyethylene glycol.4. The composition of claim 2, wherein the polar, ethylenically unsaturated monomer is a vinyl pyrrolidone, (meth) acrylic acid, a sulfonic acid containing monomer, an amino-functional monomer, or an ether of (meth) acrylic acid derivative of polyethylene glycol.5. The composition of claim 1, wherein the comb polymer comprises mono (meth) acrylate or polyethylene glycol allyl alcohol alkoxylate in polymerized form.6. The composition of claim 1, wherein the active ingredient is a pesticide.7. The composition of claim 1, wherein the dendritic polyurea preferably a hyperbranched polyurea.8. The composition of claim 7, wherein the hyperbranched polyurea can be obtained by a process comprising reacting one at least bifunctional capped di- or polyisocyanate with at least one at least bifunctional primary and / or secondary amine with elimination o
