Alkoxy group-containing silicones with reactive functional groups of defined reactivity
AssigneeWacker Chemical Corporation
InventorsTimothy McCormack, Daniel Calimente
Life of this patent
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Abstract
Organopolysiloxanes having a greater degree of defined reactivity through epoxy, isocyanate, anhydride, amino, carboxy, and (meth)acrylate groups are prepared by cohydrolytic condensation of reactive group-containing precursors and other condensable precursors in amounts such that the reactive organopolysiloxanes product contains on average more than two reactive groups, less than 20% by weight of alkoxy groups, and a proportion of non-reactive optionally substituted hydrocarbon groups such that the ratio of non-reactive hydrocarbon groups to Si atoms is greater than 1.
Claims20
A reactive organopolysiloxane prepared by hydrolytic condensation, containing on average
- a) at least two reactive functional groups per molecule, selected from the group consisting of epoxy, isocyanate, anhydride, amino, carboxy, and (meth)acrylate groups, and mixtures thereof, the functional groups SiC-bonded to silicon atoms in the reactive organopolysiloxanes, and
- b) alkoxy groups, in a concentration of from 1 weight percent to less than 20 weight percent based on the total weight of the reactive organopolysiloxanes, calculated on the basis of methoxy groups, and
- c) non-reactive optionally substituted hydrocarbon groups Si—C bonded to silicon atoms of the reactive organopolysiloxane, the non-reactive optionally substituted hydrocarbon groups present in a ratio of ≧1.1 and less than 1.5 hydrocarbon groups per atom of Si in the reactive organopolysiloxane,
- wherein the reactive organopolysiloxane is a non-resinous liquid, linear organopolysiloxane having a viscosity of from 50 cps to 106 cps.
A reactive organopolysiloxane prepared by hydrolytic condensation, containing on average
- a) at least two reactive epoxy functional groups per molecule, the reactive epoxy functional groups SiC-bonded to silicon atoms in the reactive organopolysiloxanes, and
- b) alkoxy groups, in a concentration of from 1 weight percent to less than 20 weight percent based on the total weight of the reactive organopolysiloxanes, calculated on the basis of methoxy groups, and
- c) non-reactive optionally substituted hydrocarbon groups Si—C bonded to silicon atoms of the reactive organopolysiloxane, the non-reactive optionally substituted hydrocarbon groups present in a ratio of >1 hydrocarbon group per atom of Si in the reactive organopolysiloxane,
- wherein the reactive organopolysiloxane is a non-resinous liquid, linear organopolysiloxane having a viscosity of from 50 cps to 106 cps.
Dependencies are inferred from the claim text.