NOVEL POLYETHER SILOXANE-CONTAINING ALKOXYLATION PRODUCTS BY DIRECT ALKOXYLATION OF ORGANOMODIFIED a,w-DIHYDROXYSILOXANES OVER DOUBLE METAL CYANIDE (DMC) CATALYSTS, AND ALSO PROCESS FOR PRODUCING THEM
AssigneeEvonik Goldschmidt GmbH
InventorsFrank SCHUBERT, Wilfried Knott
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Abstract
Novel silicone polyethers by alkoxylating polymerization of epoxide monomers with (poly)organosiloxanes starting from an α,ω-dihydroxysiloxane as starter by means of DMC catalysis and process for preparing them.
Claims18
Process for the alkoxylation of organosiloxanes bearing SiOH groups by means of one or more alkylene oxides or epoxide monomers, characterized in that the alkoxylation takes place in the presence of double metal cyanide catalysts.
Process for the DMC-catalysed alkoxylation reaction, in which, in a first step, a starter mixture comprising at least one α,ω-dihydroxysiloxane starter and the double metal cyanide catalyst, which may, if appropriate, have previously been slurried in a suspension medium, is placed in a reactor,
- in a second step, only part of the total amount of the epoxide monomer to be introduced is added to this initially charged mixture in order to activate the DMC catalyst and, after this initialization phase, further epoxide monomer and
- if appropriate further α,ω-dihydroxysiloxane are introduced, characterized in that α,ω-dihydroxysiloxanes are used for the alkoxylation.
Silicone polyether of the formula (VII),
- where
- the radicals R are identical or different linear or branched, saturated, monounsaturated or polyunsaturated alkyl radicals having from 1 to 20 carbon atoms, and
- a is an integer from 0 to 5000,
- and A is a polyether fragment represented by the formula (VIII)
- in which R2 or R3 and R5 or R6 are identical or different and are each, independently of one another, H or a saturated or monounsaturated or polyunsaturated, monovalent or polyvalent hydrocarbon radical which may be further substituted, where the radicals R5 and R6 are each a monovalent hydrocarbon radical and the hydrocarbon radical can be cycloaliphatically bridged via the fragment Y;
- Y can be absent or be a methylene bridge having 1 or 2 methylene units, when Y is 0 then R2 and R3 are each, independently of one another, a linear or branched hydrocarbon radical having 1 to 20 carbon atoms,
- R4 is an ether or ester function on a linear or branched alkyl radical having from 1 to 24 carbon atoms or an aromatic or cycloaliphatic radical, n is an integer from 2 to 8 and
- R7, R6, R9, R10, R11 and R12 are each, independently of one another, hydrogen or an alkyl, alkoxy, aryl or aralkyl group,
- a is an integer from 0 to 5000,
- b is an integer from 0 to 1000,
- c is an integer from 0 to 500,
- d is an integer from 0 to 500,
- e, f and g are integers from 0 to 500,
- with the proviso that
- a) the fragments having the indices b to g can be freely permutated among one another, i.e. can be exchanged with one another in the sequence within the polyether chain, and
- b) the fragments having the indices b, c and e can be present in blocks or randomly distributed as desired and
- c) the sumb+c+d+e+f+g>zero and
- d) the indices c to g are different from zero when the index b is from 1 to 200 and at the same time the fragment having the index b is EO (ethylenoxy group) or PO (propylenoxy group) or
- e) when the sum of the indices c to g is zero and the index b is from 1 to 200 and the fragments are EO or PO units, these are not present in a random sequence.
Dependencies are inferred from the claim text.