Mixtures of cyclic branched siloxanes of the D/T type and conversion products thereof
AssigneeEvonik Operations GmbH
InventorsWilfried Knott, Horst Dudzik
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Abstract
Mixtures of cyclic branched siloxanes having exclusively D and T units, 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 29Si NMR spectroscopy, is less than 2.0 and preferably less than 1.0 mole percent, are described, as are branched organomodified siloxanes obtainable therefrom.
Claims20
A mixture of cyclic branched siloxanes having exclusively D and T units, 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 29Si NMR spectroscopy, is less than 2 mole percent based on the totality of silicon detected by spectroscopy, and further comprising at least 5% by weight of siloxane cycles selected from the group consisting of octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6) and mixtures thereof.
A mixture of cyclic branched siloxanes having exclusively D and T units, 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 29Si NMR spectroscopy, is less than 2 mole percent, and further comprising at least 5% by weight of siloxane cycles selected from the group consisting of octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6) and mixtures thereof wherein the ratio of D to T units is between 10:1 and 3:1.
A starting material for production of stabilizers for PUR foams, for production of defoamers, the starting material comprising a mixture of branched organomodified siloxanes having exclusively D and T units, 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 29Si NMR spectroscopy, is less than 2 mole percent, and further comprising at least 5% by weight of siloxane cycles selected from the group consisting of octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6) and mixtures thereof wherein
- the mixtures of cyclic branched siloxanes are acid-equilibrated with silanes and/or siloxanes.
A mixture of cyclic branched siloxanes having exclusively D and T units, 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 29Si NMR spectroscopy, is less than 2 mole percent, and further comprising at least 5% by weight of siloxane cycles selected from the group consisting of octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6) and mixtures thereof, wherein the ratio of D to T units is between 6:1 and 4:1.
Dependencies are inferred from the claim text.