METHOD FOR PREPARING UREA-FUNCTIONAL SILOXANES

Urea-functional organopolysiloxanes containing units of the formulaRnSiO(4-n)/2 (I),where R is a radical R1 or a radical -OR2 or a radical Q, Q is a urea-functional radical of the formula-R5-[NR4-R6-]xNR4R3 (II),where the radicals R4 are identical or different and are each a radical R4′ or a radical Ru, where R4′ is hydrogen or a monovalent C1-C6-hydrocarbon radical where Ru is radical of the formula -C(═O)-NH2, and where at least one urea-functional radical Q having a radical Ru is present per molecule are prepared by reacting amino-functional organopolysiloxanes comprising units of the formulaR′nSiO(4-n)/2 (IV),where A is an amino-functional radical of the formula-R5-[NR4′-R6-]xNR4′R3 (V),with the proviso that at least one amino-functional radical A is present per molecule in the organopolysiloxanes made up of units of the formula (III),with ortho-substituted aryl carbamates of the formulaR7-Ar-O-C(═O)-NH2 (VI),where Ar is an ortho-substituted aryl radical.