Acetal group-containing organopolysiloxane used as gas extraction and antifoaming agents in organic systems has units having three different hydrocarbon-based groups in them

摘要

Acetal group-containing organopolysiloxane contains units having three different hydrocarbon-based groups in them, giving good solubility in low polarity media. Acetal group-containing organopolysiloxane contains units of formula (I): RaAbSiO4-a-b/2 (I) R = 1-18C hydrocarbon; A = group of formula (II); R1 = 1-6C hydrocarbon; R2 = 2-4C hydrocarbon; R3 and R4 = H or R; R5 = R or R4 and R5 form a group R6 together; R6 = 2-10C hydrocarbon; v and w = 0 or an integer; where v+w = 1-16 s and t = 0 or 1 and s + t = 1 or 2; y = 0 or 1 and x + y = 1 or 2; a-0 or 1-3; b = 0, 1 or 2; and a+3 = at most 3 and at least one group A is present. An Independent claim is included for the preparation of the above organopolysiloxane by reacting compounds of formula (III) with organopolysiloxanes with units of formula (IV) and with linear ethers of formula (Va) or cyclic ethers of formula (Vb) in the presence of the addition of Si-bound H to aliphatic multiple bond-forming catalyst and an acid catalyst: