US 12,460,081 B2
Curable condensation compounds based on alkoxy-functional polysiloxanes
Berend-Jan de Gans, Muelheim an der Ruhr (DE); Wilfried Knott, Essen (DE); Horst Dudzik, Essen (DE); Markus Hallack, Schermbeck (DE); Florian Düllmann, Hagen (DE); and Philippe Favresse, Ratingen (DE)
Assigned to Evonik Operations GmbH, Essen (DE)
Filed by Evonik Operations GmbH, Essen (DE)
Filed on Nov. 24, 2022, as Appl. No. 18/058,762.
Claims priority of application No. 21210450 (EP), filed on Nov. 25, 2021.
Prior Publication US 2023/0159756 A1, May 25, 2023
Int. Cl. C08L 83/06 (2006.01); C08G 77/08 (2006.01); C09D 183/06 (2006.01)
CPC C08L 83/06 (2013.01) [C08G 77/08 (2013.01); C09D 183/06 (2013.01)] 25 Claims
 
1. A curable condensation compound, obtained by a reaction of:
acetoxy group-bearing siloxanes of formula (I):

OG Complex Work Unit Chemistry
wherein R=an alkyl radical having 1 to 4 carbon atoms and/or phenyl radical, and 1≤x≤500,
wherein the acetoxy group-bearing siloxanes of formula (I) have not been end-equilibrated,
with
at least one alkoxy-functional polysiloxane of the formula (II)
R1cSi(OR2)dO(4-c-d)/2  Formula (II)
wherein c is not less than 0 to not more than 2, d is not less than 0 to not more than 4, and a sum total of c+d is less than 4,
R1 is the same or different and is independently a linear or branched, saturated or else mono- or polyunsaturated or aromatic hydrocarbon radical, and
R2 is an alkyl group consisting of 1 to 8 carbon atoms, and
in the presence of a catalyst.