Process for preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers

1. A process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers of the general formula [(R 2 SiO) x (C n H 2n O) y ] d , in which

R are monovalent C 1 -C 18 hydrocarbon radicals,

n is a number from 2 to 4,

x ≧5,

y ≧10,

d ≧3,

via reaction of aminosiloxanes having primary amino groups with polyoxyalkylenediols, which comprises concomitant use of one or more tertiary amines as catalyst.

2. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 1 , wherein at least one compound selected from the group of the aromatic amines and of the cycloaliphatic amines is used as catalyst.

3. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 2 , wherein at least one amine selected from the group of pyridine, pyrimidine, pyridazine, pyrazine, quinoline, imidazole, quinuclidine, diazabicyclo[2.2.2]octane, 1,8-diazabicyclo[5.4.0]undec-7-ene is used as catalyst.

4. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 1 , wherein the average molar mass of each siloxane block (—R 2 SiO—) x , where R═CH 3 —, is from 500 to 10 000 g/mol.

5. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 1 , wherein the average molar mass of each polyoxyalkylene block (—C n H 2n O—) y is from about 600 to 10 000 g/mol.

6. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 1 , wherein the average molar mass of the block copolymer is from 10 000 g/mol to about 300 000 g/mol.

7. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 1 , wherein the siloxane block content in the copolymer is from 20 to 50% by weight.

8. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 3 , wherein the average molar mass of each siloxane block (—R 2 SiO—) x , where R═CH 3 —, is from 500 to 10 000 g/mol.

9. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 3 , wherein the average molar mass of each polyoxyalkylene block (—C n H 2n O—) y is from about 600 to 10 000 g/mol.

10. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 3 , wherein the average molar mass of the block copolymer is from 10 000 g/mol to about 300 000 g/mol.

11. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 3 , wherein the siloxane block content in the copolymer is from 20 to 50% by weight.

12. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 8 , wherein the siloxane block content in the copolymer is from 20 to 50% by weight.

13. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 9 , wherein the siloxane block content in the copolymer is from 20 to 50% by weight.

14. The process for preparation of SiOC-linked, linear (AB) d polydimethylsiloxane-polyoxyalkylene block copolymers as claimed in claim 10 , wherein the siloxane block content in the copolymer is from 20 to 50% by weight.