US 11,925,883 B2
Defoaming formulations containing organopolysiloxanes
Markus Grandl, Burghausen (DE); Christoph Deckert, Burghausen (DE); Elisabeth Hoelzlwimmer, Simbach (DE); Corinna Sage, Emmerting (DE); and Josef Wimmer, Burghausen (DE)
Assigned to WACKER CHEMIE AG, Munich (DE)
Appl. No. 17/292,584
Filed by WACKER CHEMIE AG, Munich (DE)
PCT Filed Nov. 28, 2018, PCT No. PCT/EP2018/082902
§ 371(c)(1), (2) Date May 10, 2021,
PCT Pub. No. WO2020/108752, PCT Pub. Date Jun. 4, 2020.
Prior Publication US 2022/0001303 A1, Jan. 6, 2022
Int. Cl. B01D 19/04 (2006.01); C11D 1/72 (2006.01); C11D 3/00 (2006.01); C11D 3/37 (2006.01); D21H 21/12 (2006.01)
CPC B01D 19/0409 (2013.01) [C11D 1/72 (2013.01); C11D 3/0026 (2013.01); C11D 3/373 (2013.01); D21H 21/12 (2013.01)] 18 Claims
 
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.