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Abstract

An antifoam formulations comprise (A) antifoam agent based on siloxanes and (B) branched polyether/polysiloxane copolymers comprising structural units of the formula Y[--C.sub.nH.sub.2n--(R.sub.2SiO).sub.m--A.sub.p--R.sub.2Si--G].sub.x (I) in which Y is a multivalent, optionally heteroatom-containing hydrocarbon radical, R are monovalent optionally halogenated hydrocarbon radicals, A is a radical --R.sub.2Si--R.sup.2--(R.sub.2SiO)m--, G is a monovalent radical --C.sub.fH.sub.2f-2k--Z or a divalent radical --C.sub.nH.sub.2n-- bonded to a radical Y, Z --(R.sup.6).sub.v--(OCH.sub.2CH.sub.2).sub.a[OCH.sub.2CH(CH.sub.3)].sub.b-[OCH.sub.2CH(CH.sub.2CH.sub.3)].sub.c--OR.sup.3, in which R.sup.3 is hydrogen, a hydrocarbon radical, or a radical R--C(O)--, R.sup.6 is a divalent hydrocarbon radical, v is 0 or 1, a, b and c are 0 or an integer between 1 and 1000, the sum (a+b+c) being from 2 to 2000, x is 3 to 10, f is 2 to 12, k is 0 or 1, n is 2 to 12, m is at least 1, and p is 0 or a positive integer, the branched polyether/polysiloxane copolymers (B) containing on average at least one group Z.

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First Claim