Process for preparing branched polyethercarbonates and use thereof

摘要

The present invention relates to a process for preparing branched polyethers and/or polyether-like structures, to these branched polyethers themselves, and to their use.

主权项

1. A process for preparing branched polyethers, comprising:
(a) reacting a starter of the general formula (II) with one or more reactants suitable for ring-opening polymerization selected from the group consisting of alkylene oxides, glycidyl ethers, lactones and cyclic acid anhydrides, to obtain a first reaction mixture,  wherein formula (II) is:
Z(X—H)j  (II);where:
X=independently at each occurrence O, NH, N-alkyl, N-aryl or S;j=1-3; andZ=any organic radical, selected from a saturated or unsaturated alkyl radical, an aryl radical, or an aralkyl radical, with each X being linked to a carbon atom of the organic radical; (b) reacting the first reaction mixture obtained in step (a) with glycerol carbonate to obtain a second reaction mixture;  wherein the glycerol carbonate is added at a rate of 0.1 to 10 mol/h, in each case per mol of (XH) in the starters used; and (c) reacting the second reaction mixture obtained in step (b) with one or more reactants suitable for ring-opening polymerization  wherein the branched polyethers have at least one structural unit —O—C(O)—O—.