| 摘要 |
The invention therefore relates to a process for preparation of SiOC-linked, linear (AB)<SUB>d </SUB>polydimethylsiloxane-polyoxyalkylene block copolymers of the general formula [(R<SUB>2</SUB>SiO)<SUB>x</SUB>(C<SUB>n</SUB>H<SUB>2n</SUB>O)<SUB>y</SUB>]<SUB>d</SUB>, in which R are monovalent C<SUB>1</SUB>-C<SUB>18</SUB>, preferably C<SUB>1</SUB>-C<SUB>4</SUB>, hydrocarbon radicals, n is a number from 2 to 4, preferably 2 or 3, 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.
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