Process for preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers
AssigneeGoldschmidt GmbH
InventorsWilfried Knott, Ruediger Landers, Dagmar Windbiel
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Abstract
The invention therefore relates to a process for preparation of SiOC-linked, linear (AB)d polydimethylsiloxane-polyoxyalkylene block copolymers of the general formula [(R2SiO)x(CnH2nO)y]d, in which R are monovalent C1-C18, preferably C1-C4, 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.
Claims14
A process for preparation of SiOC-linked, linear (AB)d polydimethylsiloxane-polyoxyalkylene block copolymers of the general formula [(R2SiO)x(CnH2nO)y]d, in which
- R are monovalent C1-C18 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.
Dependencies are inferred from the claim text.