Mixtures of cyclic branched siloxanes of the D/T type and conversion products thereof
Mixtures of cyclic branched siloxanes having exclusively D and T units and having no functional groups, with the proviso that the cumulative proportion of the D and T units having Si-alkoxy and/or SiOH groups that are present in the siloxane matrix, determinable by 29 Si NMR spectroscopy, is ≤2 mole percent, are described, as are branched organo-modified siloxanes obtainable therefrom.
1. A mixture of cyclic branched siloxanes having exclusively D and T units and having no functional groups, wherein the cumulative proportion of the D and T units having Si-alkoxy and/or SiOH groups that are present in the siloxane matrix is determinable by 29 Si NMR spectroscopy, is ≤2 mole percent, based on the totality of silicon detected by spectroscopy.
2. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 1 , wherein the branching T unit derives from alkyltrialkoxysilanes and/or phenyltrialkoxysilanes.
3. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 2 , wherein the molar mass ratio of the mixture Mw/Mn is in the range of 2<Mw/Mn<50.
4. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 1 , wherein the branching T unit derives from methyltriethoxysilane.
5. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 4 , wherein the molar mass ratio of the mixture Mw/Mn is in the range of 2<Mw/Mn<50.
6. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 1 , wherein the ratio of D to T units is between 6:1 and 4:1.
7. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 6 , wherein the molar mass ratio of the mixture Mw/Mn is in the range of 2<Mw/Mn<50.
8. A mixture of cyclic branched siloxanes having exclusively D and T units and having no functional groups, wherein the cumulative proportion of the D and T units having Si-alkoxy and/or SiOH groups that are present in the siloxane matrix; determinable by 29 Si NMR spectroscopy, is ≤2 mole percent, wherein the ratio of D to T units is between 10:1 and 3:1.
9. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 8 , wherein the molar mass ratio of the mixture Mw/Mn is in the range of 2<Mw/Mn<50.
10. The mixture of cyclic branched siloxanes having exclusively D and T units according to claim 8 , wherein the molar mass ratio of the mixture Mw/Mn is in the range of 2<Mw/Mn<50.