Process for working up polyethersiloxanes
View Patent ↗The invention relates to a process for working up polyethersiloxanes, wherein said polyethersiloxanes are treated with H 2 O 2 and are separated from volatile components by separation methods known per se.
1. A process for working up crude polyethersiloxanes, wherein volatile components in the crude polyethersiloxanes are removed said process comprising treating the crude polyethersiloxanes with H 2 O 2 and separating off the volatile components.
2. The process according to claim 1 , wherein the H 2 O 2 is an about 0.1 to about 10% by weight aqueous solution of H 2 O 2 .
3. The process according to claim 2 , wherein the H 2 O 2 is an about 2 to about 8% by weight aqueous solution of H 2 O 2 .
4. The process according to claim 3 , wherein the H 2 O 2 is an about 3 to about 5% by weight aqueous solution of H 2 O 2 .
5. The process as claimed in claim 1 , wherein the treatment with H 2 O 2 is carried out at temperatures in the range from about 50 to about 140° C.
6. The process as claimed in claim 1 , wherein H 2 O 2 is used in amounts of from about 0.05 to about 5% by weight, based on the polyethersiloxane to be treated.
7. The process as claimed in claim 6 , wherein H 2 O 2 is used in amounts of from about 0.1 to about 1% by weight, based on the polyethersiloxane to be treated.
8. The process as claimed in claim 1 , wherein the polyethersiloxanes are Si—C-linked allylpolyethersiloxanes.
9. The process as claimed in claim 1 , wherein the polyethersiloxanes are polysiloxane/polyoxyalkylene block copolymers.