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
1993-04-26
1995-01-31
Szekely, Peter
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From boron reactant having at least one boron to hydrogen or...
264 22, 264 25, 264 63, 264 65, C08G 7908, F27B 910, H05B 602, C04B 3564
Patent
active
053860063
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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Seyferth and Plenio (J. Am. Ceram. Soc., 1990, 73(7), 2131-2133) titled: Borasilazane Polymeric Precursors for Borosilicon Nitride.
Matsumoto Roger L. K.
Schwark Joanne M.
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