| 摘要 |
<p>Silicone polyether is new. Silicone polyether of formula (A-O-(R)(R)Si-[O-Si(R)(R)] a-O-A) (VII), is new. R : saturated, mono- or polyunsaturated 1-20C alkyl; a : 0-5000; A : a polyether fragment of formula (VIII); either R 2>, R 3>, R 5>, R 6>H or saturated or optionally mono- or polyunsaturated, also further substituted, optionally mono- or polyvalent hydrocarbon; or R5, R6 : a monovalent hydrocarbon radical, where the hydrocarbon residue is cycloaliphatically bridged over the fragment Y1; or R 2>, R 3>1-20C hydrocarbon; Y1 : absent or methylene bridge having 1 or 2 methylene units; R 4>ether- or ester function of 1-24C alkyl or an aromatic or cycloaliphatic residue; n : 2-8; R 7>-R 1> 2>H, alkyl, alkoxy, aryl or aralkyl; b : 0-1000; and c, d, e, f, g : 0-500. Provided that (a) the fragments with the indices b to g are freely permutable (i.e. they are exchangeable with one another within the polyether chain); (b) the fragments with the indices b, c and e are juxtaposed in block-wise manner or statistically distributed; (c) the sum of b, c, d, e, f and g is greater than zero; and (d) the indices c to g are not zero, when the index b is 1-200 and at the same time the fragment with the index b is ethyleneoxy group propyleneoxy group or (e) when the sum of the indices c to g is equal to 0 and the index b is 1-200 and the fragment corresponds to ethyleneoxy- or propyleneoxy units, which are not statistically distributed in its sequence. Independent claims are included for: (1) alkoxylation of silicon hydroxide group carrying organosiloxanes using one or more alkylene oxides or epoxide monomers in the presence of double metal cyanide (DMC) catalyst; (2) producing silicone polyether; and (3) DMC-catalyzed alkoxylation reaction, comprising providing a starting mixture consisting of at least one dihydroxy siloxane starter and the DMC catalyst that is previously suspended in a suspending agent, into a reactor, adding only a part of total amount of the epoxide monomers to the mixture to activate the DMC catalyst, after this initialization phase, adding the further epoxide monomer and optionally further alpha , omega -dihydroxy siloxane. [Image].</p> |
