Patent ID: 11925883
Assignee: WACKER CHEMIE AG
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  D | IPC B  C  D

Claim 0:
1. A defoamer formulation, comprising:
(1) organopolysiloxane(s) containing per molecule, at least one structural unit of formula

O1/2R2Si—Y—SiRO2/2  (I), and at least 2 units of formula

R1R2SiO1/2  (II), and units of formula

R2SiO2/2  (III),, wherein, R each is identical or different and represents a monovalent SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms which optionally contains one or more nonadjacent oxygen atoms and which is free from aliphatic carbon-carbon multiple bonds, and, R1 is R or an alkenyl radical having 2 to 30 carbon atoms, wherein at least one alkenyl radical per molecule is present,, Y is a divalent hydrocarbon radical having 2 to 30 carbon atoms, with the proviso that the organopolysiloxane contains a structural element of formula

R2Y2SiO—(SiR2O)x1—SiRY1O—(SiR2O)x2—SiR2R1  (IV),, wherein, R and R1 are as defined above,, Y1 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiR2O1/2,, Y2 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiRO2/2, and, x1 and x2 are 0 or an integer,, with the proviso that the sum of x1+x2 is x,, wherein x is on average more than 5, and less than 100,
(2) fillers,
(3) organopolysiloxane resin(s) composed of units of formula

R2e(R3O)fSiO(4-e-f)/2  (V),, wherein, R2 each is identical or different and represents a hydrogen atom or a monovalent, optionally substituted, SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms,, R3 each is identical or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical having 1 to 4 carbon atoms,, e is 0, 1, 2, or 3 and, f is 0, 1, 2, or 3,, with the proviso that the sum of e+f is not more than 3 and that the sum of e+f is 2 in less than 50% of all units of formula (V) in the organopolysiloxane resin,
(4) polyethylene oxide-derived surfactants, and
(5) inorganic or organic acids.