Organopolysiloxane polyethers and their use as hydrolysis-resistant wetting agents in aqueous systems
AssigneeTh. Goldschmidt AG
InventorsGeorg Feldmann-Krane, Werner Hohner, Dietmar Schaefer, Stefan Silber
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Abstract
Organopolysiloxane polyethers with increased resistance to hydrolysis are prepared. Furthermore, a method of rendering an aqueous system hydrolysis-resistant and exhibiting increased wetting property utilizing such polysiloxane polyethers as wetting agents in aqueous systems is described. Aqueous coating systems containing such polyethers exhibit increased wetting property and are resistant to alkaline and acidic hydrolysis.
Claims10
An Organopolysiloxane polyether of the general formula ##STR10## wherein R.sup.1 is a divalent, optionally branched alkylene group with 3 to carbon atoms in the alkylene chain,
- R.sup.2 is a group of the formula (C.sub.m H.sub.2m O--).sub.s R.sup.3, in which m is a number greater than 2.0 and not greater than 2.5, s is a number from 4 to 21 and R.sup.3 is a hydrogen group, an alkyl group with 1 to 4 carbon atoms or an acetyl group, on the condition that, when R.sup. group has only 3 to 4 carbon atoms, a blockwise arrangement of the oxyalkylene units corresponding to the formula (C.sub.3 H.sub.6 O--).sub.p (C.sub.2 H.sub.4 O--).sub.q (C.sub.3 H.sub.6 O--).sub.1 R.sup.3 must be maintained, in which p is a number from 1 to 3, q is a number from 4 to 15 and r is a number from 0 to 3,
- n is a number from 1 to 3,
- with the proviso that at least 50 mole percent of the oxyalkylene groups are oxyethylene groups.
Dependencies are inferred from the claim text.