Method for organic defoaming and / or degassing

摘要

PCT No. PCT/EP91/01896 Sec. 371 Date Feb. 24, 1993 Sec. 102(e) Date Feb. 24, 1993 PCT Filed Oct. 4, 1991 PCT Pub. No. WO92/05854 PCT Pub. Date Apr. 16, 1992.A process for defoaming and/or degassing organic systems by addition of an organopolysiloxane-containing anti-foaming agent to the organic system is characterized by the fact that the organopolysiloxane used is one composed of siloxane units having the general formulae (I) and (II), in which R is a univalent hydrocarbon residue with 1 to 18 carbon atoms per residue; A is a residue having the general formula (a), in which R1 is a residue having the formula -CR3H-, where R3 stands for a hydrogen atom or a univalent organic residue; R2 is a residue having the formulae -CR4H-CH2- or -CH2CH2CH2- where R4 stands for a hydrogen atom or a univalent organic residue; v and w represent each O or an integer, the sum of v+w being in average 0 to 16; x and y represent each 0 or 1, the sum x+y being 1 or 2; a equals 1,2 or 3; b equals 0, 1 or 2 and c equals 1 or 2, the sum b+c not exceeding 3.