Silicone copolymers production thereof and use thereof for treatment of fibrous substrates

A silicone copolymer (A) of the formula (I)

• where
• Y is identical or different and denotes a divalent hydrocarbon radical which has 1 to 20 carbon atoms, optionally containing one or more heteroatoms,
• Z is identical or different and denotes a divalent organic radical which contains a polyoxyalkylene group,
• R1 is identical or different and is a radical of the formula
• —N(R4)—R5 (IV′),
• R2 is identical or different and denotes a monovalent hydrocarbon radical which has 1 to 18 carbon atoms, optionally containing halogen or oxygen atoms,
• R3 is identical or different and is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 20 carbon atoms,
• R4 denotes a hydrogen atom, a C1-18 alkyl radical, or a hydrocarbon radical which has 4 to 18 carbon atoms and contains one or more oxygen or nitrogen atoms, and
• R5 denotes a C1-18 alkyl radical, or a hydrocarbon radical which has 4 to 18 carbon atoms and contains one or more oxygen or nitrogen atoms,
• or R4 and R5 in formula (IV′) together denote a divalent hydrocarbon radical which optionally contains one or more oxygen or nitrogen atoms,
• R6 is identical or different and denotes a C1-C10 alkylene radical, and
• R7 denotes a C1-C10 alkylene radical,
• n is an integer from 10 to 2000,
• p is an integer from 1 to 5, and
• w is on average 2.5 to 80.