Crosslinked and branched organopolysilanes
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United States of America Patent
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May 6, 2008
Grant Date -
Feb 9, 2006
app pub date -
Jul 7, 2005
filing date -
Aug 5, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for preparing crosslinked or branched organopolysilanes which contain at least one unit of the general formulae 1 and/or 2 RSi.dbd., (1) .dbd.Si.dbd., (2) at least one unit of the general formula 3 R.sub.2Si.dbd., (3) and optionally units of the general formula 4 R.sub.3Si-- (4) in which silane(s) of the general formulae 1a and 2a RSiX.sub.3, (1a) SiX.sub.4, (2a) and 3a R.sub.2SiX.sub.2, (3a) and optionally silane of the general formula 4a R.sub.3SiX, (4a) where R is hydrocarbyl and X is halo, are reacted with elemental metal, the addition of the reactants being such that the silane of the general formula 3a in the reaction with elemental metal contains at most 2 mol % of silane which is selected from silanes of the general formulae 1a and 2a, and to the organopolysilanes obtainable by the process.
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