Patent ID: 11931673
Assignee: WACKER CHEMIE AG
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  D | IPC B  C  D

Claim 3:
4. The defoamer formulation of claim 1, wherein the organopolysiloxane(s) (1) are produced by reacting:
(A) oligomeric or polymeric organosilicon compounds containing units of formula

R1R2SiO1/2   (II),, units of formula

R2 SiO2/2   (III),, and units of formula

HRSiO2/2   (VIII), with the proviso that, at least one alkenyl radical R1 per molecule is present,, the sum of the units HRSiO2/2 and R1R2SiO1/2 is on average greater than 2.0,, and the number of alkenyl radicals R1 is on average greater than the number of Si-bonded hydrogen atoms, and optionally
(B) oligomeric or polymeric organosilicon compounds containing units of formula

R7R2 SiO1/2   (IX), and, units of formula

R2 SiO2/2   (III),, wherein, R7 is an alkenyl radical having 2 to 30 carbon atoms,
 are reacted in the presence of
(C) catalysts which promote the addition of Si-bonded hydrogen onto aliphatic double bonds,, wherein the ratio of aliphatic double bond in the components (A) and optionally (B) to Si-bonded hydrogen in the component (A) is 1.2 to 10.