Process for preparing siloxanes containing oxamido ester groups

A method for preparing siloxanes having oxamidoester groups, comprising:

• reacting
• (A) silanes of the formula
• optionally (B) silanes of the formula
• R4t(R5O)4-tSi (III)
• and (W) water,
• where
• R1 each independently are monovalent, optionally substituted, SiC-bonded hydrocarbon radicals that may be interrupted by heteroatoms,
• R2 each independently are hydrogen or monovalent, optionally substituted hydrocarbon radicals optionally interrupted by heteroatoms,
• R3 each independently are monovalent, optionally substituted hydrocarbon radicals optionally interrupted by oxygen atoms,
• Rx each independently are hydrogen or optionally substituted hydrocarbon radicals,
• Y each independently are divalent, optionally substituted hydrocarbon radicals optionally interrupted by oxygen atoms or nitrogen atoms,
• R4 each independently are monovalent, optionally substituted, SiC-bonded hydrocarbon radicals optionally interrupted by heteroatoms,
• R5 each independently are hydrogen or monovalent, optionally substituted hydrocarbon radicals optionally interrupted by heteroatoms,
• s is 0, 1 or 2 and
• t is 0, 1, 2 or 3.