Boron/nitrogen preceramic polymers and boron nitride ceramic mat

Details Boron/nitrogen preceramic polymers and boron nitride ceramic mat Boron/nitrogen preceramic polymers and boron nitride ceramic mat

1989-10-06

1991-12-10

Marquis, Melvyn I.

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

Synthetic resins

From boron reactant having at least one boron to hydrogen or...

528 7, 501 92, C08G 7756

Patent

active

050719351

ABSTRACT:
Organometallic boron
itrogen polymers, precursors of boron nitride, include recurring structural units of the formulae (I) and (II): ##STR1## wherein X is N-R.sup.3, Y is NR.sup.1 R.sup.2 and Z is N-R, in which R, R.sup.1, R.sup.2 and R.sup.3, which may be identical or different, are each a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical and are prepared by reacting (a) at least one cyclic compound (compound A) containing recurring structural units of the formula (1): ##STR2## wherein A is a halogen atom and R is a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical, with (b) at least one compound including at least one boron atom to which two halogen atoms are directly bonded (compound B), and (c) at least one compound containing at least one NH.sub.2 group compound C); the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.

REFERENCES:
patent: 4581468 (1986-04-01), Paciorek et al.
patent: 4939222 (1990-07-01), Mignani et al.

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