| 摘要 |
Compositions comprising (A) an organosilicon compound of the formula <?in-line-formulae description="In-line Formulae" end="lead"?>Ra(R1O)bR2cSiO(4-a-b-c)/2 (I)<?in-line-formulae description="In-line Formulae" end="tail"?> in which R2 independently denotes a monovalent, SiC-bonded, optionally substituted, aliphatic cyclic or aliphatic branched hydrocarbon radical having at least 3 carbon atoms, R, and R1 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; at least one additive (B) selected from (B1) filler particles and/or (B2) organopolysiloxane resin(s) and optionally (C) an organosilicon compound which has units of the formula (III), <?in-line-formulae description="In-line Formulae" end="lead"?>R5g(R6O)hSiO(4-g-h)/2 <?in-line-formulae description="In-line Formulae" end="tail"?> where R5 and R6 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.
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