Silicone copolymers with pendant alkyl radicals attached via allyl glycidyl ether and related compounds, and use thereof as stabilizers for production of flexible polyurethane foams

A silicone copolymer of formula (I)

• where
• a is 1 to 178,
• b, c and d are each independently 0 to 177,
• the radicals R are each independently identical or different alkyl radicals,
• R1 and R2 are the same or different and in each occurrence is an oxygen-containing hydrocarbon radical,
• R3 is =—(CH2)z—O—CH2—C(CH2CH3)(CH2ORy)—CH2—O—CH2—R10,
• Rx in each occurrence is independently R1, R2, R3 or R,
• Ry in each occurrence is independently a hydrogen radical, alkyl, acyl or a polyether moiety —(C2H4O)o—(C3H6O)p—(CH2—CHR′—O)q—R4,
• o, p and q are each independently 0 to 100 subject to the proviso that the sum total of o+p is in each case greater than 0,
• R4 in each occurrence is independently a hydrogen radical or an alkyl group of 1 to 4 carbon atoms, a —C(O)—R′″ group where R′″=alkyl, a —CH2-O—R′ group, an alkylaryl group, or a —C(O)NH—R′ group, and R′ in each occurrence is an unsubstituted or substituted alkyl radical, aryl radical, or a halogen,
• z in each occurrence is independently 2 to 4,
• R10 in each occurrence is CH═CH2 or CH2—CH2—R9, and the same or different, and
• R9 in each occurrence is H or a siloxane moiety of formula (Ia)
• where a to d, R, Rx and R1 to R3 are each as defined for formula (I), e is 1 to 10,
• with the proviso that the sum total a+b+c+d per unit of formula (I) or (Ia) is 38 to 178 and the sum total of the attached units of formulae (Ia) per silicone copolymer of formula (I) does not exceed three.