Preparing amine-amide-functional siloxane, comprises reacting silicon hydroxide-functional siloxane (I) with amino-functional silane (II) in the presence of carboxylic acid and optionally in the presence of alcohols, amines and/or alkanolamines at 40-180[deg] C. Preparing amine-amide-functional siloxane, comprises reacting silicon hydroxide-functional siloxane of formula (M aD1 bT cQ d) (I) with amino-functional silane of formula (R1 e(R2O) fSiR3) (II) in the presence of carboxylic acid and optionally in the presence of alcohols, amines and/or alkanolamines at 40-180[deg] C. M : [HO-SiR1 2O 1 / 2]； D1 : [SiR1 2O 2 / 2]； T : [SiR1O 3 / 2]； Q : [SiO 4 / 2]； a : 2-10； b : 5-150； c : 0-10； d : 0-10； R1 : 1-30C, 6-30C aryl, 7-30C alkaryl； either e : 0-2； and f : 1-3； or e+f : 3； R2 : 1-30C alkyl, 6-30C aryl or 7-30C alkaryl； and R3 : organic groups which carry one amino function. An independent claim is also included for a composition obtained by the above mentioned method, comprising amide-amine siloxane of formula (M1 jM2 kD1T mQ nM3 oD2 pT1 q) (IV). M1 : [R6OSiR1 2O 1 / 2]； M2 : [R1 3SiO 1 / 2]； M3 : [R7SiR1 2O 1 / 2]； D2 : [SiR1R7O 2 / 2]； T1 : [SiR7O 3 / 2]； R6 : R2 or H； R7 : organic residues, where each molecule (IV) statistically carries one amine group of formula (-(CR5 2) g[NR8-(CR5 2) i] hNR8 2) (III) and one amide group of formula -(CR5 2) g[NR8-(CR5 2) i] hNR8 2) (V)； R8 : R5 or carboxylate, where one of the two R8 residues in (V) is carboxylate； either j, k : 0-10； or j+k : >；= 2； l : 10-3000； m, n : 0-20； either o : 0-10； and p : 0-20； or o+p : >；= 2； and q : 0-20.
