Patent ID: 8309673
Filing Date: 2012-11-13
Classification: C08G

Abstract:
1. A process for the alkoxylation of organosiloxanes bearing SiOH groups by means of one or more epoxide monomers in order to produce the silicone polyethers 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, a is an integer from 0 to 5000, in which R R n is an integer from 2 to 8 and R 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 sum b+c+d+e+f+g>zero and the sum of 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, wherein: the alkoxylation takes place in the presence of double metal cyanide catalysts; and lactones, saturated, unsaturated or aromatic cyclic dicarboxylic anhydrides or carbon dioxide are used either alone or in any mixtures with one another as monomers; and the epoxide monomers of formula (II) or (III) where R where at least one glycidyloxypropyl group is bound via an ether or ester function R are incorporated terminally, in isolated positions, cumulated in blocks or randomly distributed into the alkylene oxide chain of the silicone polyether, or added in blocks or randomly onto one or more chain starters of the formula (I) having at least one reactive SiOH group.