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US 7,459,514 B2Granted
Process for the preparation of organopolysiloxanes having silanol groups
AssigneeWacker Chemie AG
InventorChristian Ochs
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Abstract
A process for the preparation of organosilicon compounds bearing silanol groups, in particular linear polyorganosiloxanes bearing lateral silanol groups, in a predictable manner and high yield, comprising reacting a similarly constructed Si—H functional organosilicon compound with water in the presence of a Group VIII metal catalyst, optionally in the presence of a cocatalyst. Predictable product structure and very few byproducts are particularly advantageous.
Claims11
A process for the preparation of organosilicon compounds having silanol groups, of the formula
- wherein
- e is from about 80 to about 1000,
- g is from 0 to 199,
- h is from 1 to about 200,
- R each are identical or different monovalent, SiC bonded, optionally substituted C1-18 hydrocarbon radicals,
- R2 is R or —OH,
- and the sum of g+h is f,
- comprising reacting an organopolysiloxane (A) having SiH groups, of the formula
- wherein
- e is from 80 to 1000,
- f is from 1 to about 200,
- R1 is hydrogen or R,
- with
- water (C)
- in the presence of
- at least one catalyst (B) selected from the group consisting of metals of subgroup VIII of
- the Periodic Table of Elements and compounds thereof,
- further in the presence of
- at least one cocatalyst (K) comprising an organic acid, a low molecular weight organosilicon hydride, or a mixture thereof.
16 more elements
Dependencies are inferred from the claim text.