Crosslinked and branched organopolysilanes

Details Crosslinked and branched organopolysilanes Crosslinked and branched organopolysilanes

2008-05-06

2008-05-06

Zimmer, Marc S. (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

Reexamination Certificate

active

07368517

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 2in-line-formulae description="In-line Formulae" end="lead"?RSi═,  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?═Si═,  (2)in-line-formulae description="In-line Formulae" end="tail"?at least one unit of the general formula 3in-line-formulae description="In-line Formulae" end="lead"?R2Si═,  (3)in-line-formulae description="In-line Formulae" end="tail"?and optionally units of the general formula 4in-line-formulae description="In-line Formulae" end="lead"?R3Si—  (4)in-line-formulae description="In-line Formulae" end="tail"?in which silane(s) of the general formulae 1a and 2ain-line-formulae description="In-line Formulae" end="lead"?RSiX3,  (1a)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?SiX4,  (2a)in-line-formulae description="In-line Formulae" end="tail"?and 3ain-line-formulae description="In-line Formulae" end="lead"?R2SiX2,  (3a)in-line-formulae description="In-line Formulae" end="tail"?and optionally silane of the general formula 4ain-line-formulae description="In-line Formulae" end="lead"?R3SiX,  (4a)in-line-formulae description="In-line Formulae" end="tail"?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.

REFERENCES:
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patent: 5905139 (1999-05-01), Mori et al.
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patent: 0 949 289 (1999-10-01), None
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patent: 7-113010 (1995-05-01), None
patent: 2003-277507 (2003-10-01), None
Translation of paragraph 54 of JP 2003-277507 prepared by USPTO translation office.
Patent Abstract of Japan corresponding to JP 10237177, Sep. 8, 1998.
Patent Abstract of Japan corresponding to JP 07113010, May 2, 1995.

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