Isocyanate- and isothiocyanate-modified polysilazane ceramic pre

Details Isocyanate- and isothiocyanate-modified polysilazane ceramic pre Isocyanate- and isothiocyanate-modified polysilazane ceramic pre

1988-12-20

1990-05-29

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 25, 556412, 525474, C08G 7704

Patent

active

049297040

ABSTRACT:
Polysilazane addition polymers are prepared by (1) reacting ammonia with one or more halogenated organic silicon compounds to produce a cyclic silazane ammonolysis product and (2) reacting the ammonolysis product with from 0.1% to 30% by weight of an isocyanate, isothiocyanate, ketene, thioketene, carbodiimide, or carbon disulfide. Polysilazane addition polymers containing alkenyl or alkynyl groups can be cured by supplying energy to generate free radicals. The cured or uncured polymers can be pyrolyzed to produce silicon nitride-containing ceramic materials.

REFERENCES:
patent: 3239489 (1966-03-01), Fink
patent: 3320184 (1967-05-01), Fink
patent: 3853567 (1974-12-01), Verbeek
patent: 4397828 (1983-08-01), Seyferth et al.
patent: 4482669 (1984-11-01), Seyforth et al.
patent: 4612383 (1986-09-01), Laine et al.
patent: 4675424 (1987-06-01), King et al.
patent: 4689252 (1987-08-01), Lebrun et al.
patent: 4722988 (1988-02-01), Porte et al.
patent: 4761389 (1988-08-01), Rabe et al.
Fink, W. Reaction of Isocyanates with Si-N Bonds, Chem. Ber., 97 (5), 1433 (1964).
Klebe et al., J. Am. Chem. Soc. 86 (20), 4400 (1964).

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