Process for preparing polyalkylene ether-modified polysiloxanes and use thereof
AssigneeBASF SE
InventorsLothar Engelbrecht, Wolfgang Peter, Clemens Auschra, Ralf Knischka, Reiner Kranwetvogel
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Abstract
The invention relates to a process for preparing oligo- or polyalkylene ether-modified polysiloxanes by transesterification of alkoxy-functionalized polysiloxanes with OH— terminated oligo- or polyalkylene ethers in the presence of the tetra-n-C1-C6-alkoxy-titanate as catalyst. Oligo- or polyalkylene ether-modified polydimethylsiloxanes obtainable through this process are suitable as defoamers, as wetting agents, and as additives in coating material formulations.
Claims10
A process for preparing at least one polysiloxane having at least one oligo- or polyalkylene ether group, the process comprising:
- reacting a polysiloxane having at least one C1-C6 alkoxy group bonded to a silicon atom of the polysiloxane with an OH-terminated oligo- or polyalkylene ether of formula (3a) in the presence of a tetra-C1-C6 alkoxytitanate;
- R-[O-A]k-OH (3a),
- wherein A is C2-C4 alkane-1,2-diyl,
- k is a number from 2 to 100, and
- R is a monovalent hydrocarbon radical having 1 to 20 C atoms.
Dependencies are inferred from the claim text.