Formulation and its use as defoamer

1. A formulation, comprising a polyether siloxane, wherein a polyether that is terminated with an ester group and that is different from the polyether siloxane is present in the formulation in an amount of from 0.5 to 10% by weight based on the complete formulation,

wherein the polyether is polpropylene glycol monobutyl ether that is terminated with an ester group, wherein the ester group is selected from the group consisting of sulfate, phosphorylate, and maleate, and wherein the formulation is a defoamer formulation.

2. The formulation according to claim 1 , wherein the polyether is terminated with a sulfate group.

3. The formulation according to claim 1 , wherein the polyether is present in an amount of from 0.75 to 7.5% by weight, based on the complete formulation.

4. The formulation according to claim 1 , wherein the formulation comprises fumed silica.

5. The formulation according to claim 1 , wherein the formulation comprises water.

6. The formulation according to claim 1 , wherein the polyether siloxane is of the general formula described by formula (I)

in which

R, R 1 and R 2 in the average molecule can be identical or different and denote an alkyl radical having 1 to 30 or the radical —Z—(C n H 2n O—) m R 3 ,

wherein

R 3 is a hydrogen radical or an alkyl radical having 1 to 8 carbon atoms,

Z is a divalent radical of the formula —O—, —(CH 2 ) p —O— or —CH 2 —CH(CH 3 )CH 2 —O— with p=2 to 6,

n is an average numerical value from 2.7 to 4.0,

m is an average numerical value from 5 to 130,

a and a together have an average numerical value from 4 to 1500,

b and b′ together have an average numerical value from 0 to 100, and

c and c′ together have an average numerical value from 0 to 50.

7. The formulation according to claim 6 , wherein in formula (I) b+b′ is >0 and c+c′ is >0, and R, R 1 , and R 2 are the radical —Z—(C n H 2n O—) m R 3 , Where R 3 is a hydrogen radical or an alkyl radical having 1 to 8 carbon atoms, Z is a divalent radical of the formula —O—, —(CH 2 ) p —O— or —CH 2 —CH(CH 3 )—CH 2 —O— with p=2 to 6, with molecular weights (Mn)>1000.

8. A process for the production of a defoamed composition, comprising adding the formulation according to claim 1 to a composition to be defoamed.

9. The process according to claim 8 , wherein the formulation is added to the composition in an amount of from 0.05 to 2% by weight, based on the composition to be defoamed.

10. The process according to claim 8 , wherein the composition to be defoamed is selected from coating agents, paints, and varnishes.

11. A composition, comprising a formulation as claimed in claim 1 in an amount of from 0.05 to 2% by weight, based on the composition.

12. The composition according to claim 11 , wherein the composition is a coating agent, a paint or a varnish.

13. The formulation according to claim 1 , wherein the polyether is polypropylene glycol monobutyl ether that is terminated with a sulfate group.

14. The formulation according to claim 1 , wherein the polyether is present in an amount of from 1 to 5% by weight, based on the complete formulation.

15. The formulation according to claim 6 , wherein in formula (I) b+b′ is >0 and c+c′ is >2, and R, R 1 , and R 2 are the radical —Z—(C n H 2n O—) m R 3 , where R 3 is a hydrogen radical or an alkyl radical having 1 to 8 carbon atoms, Z is a divalent radical of the formula —O—, —(CH 2 ) p —O— or —CH 2 —CH(CH 3 )—CH 2 —O— with p=2 to 6, with molecular weights (Mn)>1000.

16. The process according to claim 8 , wherein the formulation is added to the composition in an amount of from 0.1 to 0.5% by weight, based on the composition to be defoamed.

17. A composition, comprising a formulation as claimed in claim 1 in an amount of from 0.1 to 0.5% by weight, based on the composition.