| abstract |
Compositions comprisingn (A) an organosilicon compound of the formulan nR a (R 1 O) b R 2 c SiO (4-a-b-c)/2 (I)n nin whichn nR 2 independently denotes a monovalent, SiC-bonded, optionally substituted, aliphatic cyclic or aliphatic branched hydrocarbon radical having at least 3 carbon atoms, R, and R 1 are hydrogen or hydrocarbon radicals, the sum a+b+c≦3, the organosilicon compound has at least one unit of the formula (I) with c other than 0, and in at least 50% of all of the units of the formula (I) in the organosilicon compound the sum a+b+c is 2;n nat least one additive (B) selected fromn (B1) filler particles and/or (B2) organopolysiloxane resin(s)n nand optionallyn (C) an organosilicon compound which has units of the formula (III),n nR 5 g (R 6 O) h SiO (4-g-h)/2 n nwhere R 5 and R 6 are hydrogen or a hydrocarbon radical, g+h≦3 and in at least 50% of the units (III), g+h=2, are highly effective and long lasting defoamers. |