Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From boron reactant having at least one boron to hydrogen or...
Patent
1991-10-07
1993-04-27
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From boron reactant having at least one boron to hydrogen or...
C08G 7908
Patent
active
052063275
ABSTRACT:
The present invention relates to preceramic polymers incorporating boron and their application in the sintering of SiC ceramics. The present invention is also directed to a process for preparing a boron-substituted polysilazane which involves preparing a silazane ammonolysis product by reacting ammonia with a halogenated silicon compound selected from the group consisting of RSiX.sub.3, RR'SiX.sub.2, RR'R"SiX, SiX.sub.4 and mixtures thereof, wherein X is selected from the group consisting of Cl, Br and I; and R, R' and R" are the same or different and are selected from the group consisting of H, substituted or unsubstituted 1-6 carbon alkyl groups, aryl groups, 2-6 carbon alkenyl groups and 2-6 carbon alkynyl groups, wherein at least one of the halogenated silicon compounds may comprise at least one member selected from the group consisting of alkenyl groups and alkynyl groups; and reacting the silazane ammonolysis product with a borane containing at least one B--H group per molecule under conditions and for a time sufficient to form a boron-substituted polysilazane containing boron-carbon bonds.
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Matsumoto Roger L. K.
Schwark Joanne M.
Hercules Incorporated
Michl Paul R.
Szekely Peter
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