DEFOAMING COMPOSITIONS

摘要

The invention relates to novel compositions containing (A) at least one organosilicon compound from units of the formula Ra (R1O) bSiO(4-a-b)/2 (I), wherein R is the same or different and may represent a hydrogen atom or a monovalent, optionally substituted SiC-bound aliphatic hydrocarbon group with 1 to 30 C atoms, R1 is the same or different and may represent a hydrogen atom or a monovalent, optionally substituted hydrocarbon group with 1 to 4 C atoms, a is 1, 2 or 3 and b is 0 or 1, with the proviso that the sum is a+b2/s to 0.01 m2/s at 25°C and 101.425 kPa; (B) at least one organosilicon compound from units of the formula Rc (R1O) dSiO(4-a-b)/2 (II), wherein R and R1 are defined as above, c is 1, 2 or 3 and d is 0 or 1, with the proviso that the sum is c+d2/s at 25°C and 101.425 kPa; and (C) at least one additive selected from (C1) filler particles and/or (C2) organosiloxane resin from units of the formula R2 e (R3O) fSiO(4-e-f)/2 (III), wherein R2 is defined as R and R3 is defined as R1, e is 0, 1, 2 or 3 and f is 0, 1, 2 or 3, with the proviso that the sum is e+f<3 and that in less than 50% of all units of formula (III) the sum of e+f equals 2 in the organosiloxane resin.