Kion Corporation

Clariant Finance (bvi) Limited

Gary J Knasiak

Albert E Abel

Robert W Mouk

Alexander Lukacs, Iii

Tracy A Kruger

Silazanes and/or polysilazanes are prepared by ammonolysis reaction in liquid anhydrous ammonia by introducing at least one halosilane into the ammonia. In addition to the silazane and/or polysilazane, an ammonolysis by-product also results. A substantially more efficient process is disclosed for treating the by-product through the addition of a liquid, namely water, or a solution comprising a strong base, or an aqueous acid solution. The process may be employed for more efficient, economical recovery of ammonia from such waste stream solutions of ammonia halide, or acids thereof for use as recycle in the further production of silazanes and polysilazanes, and/or for producing a less hazardous, more readily disposable salt residue thereof.

Ammonia recovery in the preparation of silazanes and polysilazanes

Surfaces of various types of substrates, including glass, ceramics, and metals, are rendered stable to heat and corrosion by treatment with a silicon-containing polymer which may be an alkoxy silyl substituted polysilazane or an alkoxy silyl substituted polysiloxazane. Polymeric coatings of the compositions may be cured at room temperature to about 50&deg; C. in an atmosphere containing moisture without requiring the introduction of a catalytic curing agent.

Thermally stable, moisture curable polysilazanes and polysiloxazanes

Polysilazane/polysiloxane block copolymers particularly suitable for the preparation of durable, adherent silicon-containing coatings comprising polymeric segments of a polysilazane and polysiloxane are disclosed.

Polysilazane/polysiloxane block copolymers

This invention is directed to novel ammonolysis products including novel silazanes and polysilazanes characterized by repeating units of silicon-nitrogen in a polymeric compound having a reduced amount of Si&mdash;H bonds relative to the amount of Si&mdash;H bonds in the starting compound. Preparation of these novel ammonolysis products comprises introducing a starting compound containing at least one Si&mdash;H bond, such as a halosilane into a stoichiometric excess of anhydrous liquid ammonia wherein an ammonium halide is generated acting as an acid catalyst to provide an ionic and/or acidic environment for preparing the novel ammonolysis compounds. The prepared novel ammonolysis products are retained in a separate liquid-phase layer and distinct from the anhydrous liquid ammonia containing the ionized ammonium halide. Also provided are methods to purify ammonolysis products and to modify ammonolysis products by controllably increasing viscosity from a liquid to a solid and viscosities there between.

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Columbus, OH, United States of America

Gary J Knasiak