Process for preparing oxamide-functional siloxanes

A process for producing amino-oxo-acetate-functional organosiloxanes by reacting (A) siloxanes of the general formula (I)

• with
• (B) siloxanes selected from
• (B1) linear siloxanes of the general formula
• HO[SiR2O]tH (II)
• and
• (B2) cyclic compounds of the general formula
• (SiR42O)s (III),
• where
• R may be the same or different and denotes a hydrogen atom or monovalent, optionally substituted, SiC-bonded hydrocarbon radicals, which may be interrupted by heteroatoms,
• R1 may be the same or different and denotes monovalent, optionally substituted, SiC-bonded hydrocarbon radicals, which may be interrupted by heteroatoms,
• Y may be the same or different and represents divalent, optionally substituted hydrocarbon radicals, which may be interrupted by oxygen atoms,
• R2 may be the same or different and denotes a hydrogen atom, monovalent, optionally substituted hydrocarbon radicals, which may be interrupted by oxygen atoms,
• R4 may he the same or different and denotes a hydrogen atom, Si-bonded halogen atom, Si-bonded bonded hydroxyl group or monovalent, optionally substituted, SiC-bonded hydrocarbon radicals, which may be interrupted by heteroatoms,
• Rx may be the same or different and signifies a hydrogen atom or optionally substituted hydrocarbon radicals,
• m is 0 or an integer,
• s is an integer from 3 to 10 and
• t signifies an integer greater than 1,
• in the presence of
• (C) catalysts.