C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 7/02 (2006.01) C07F 7/21 (2006.01) C08G 77/62 (2006.01)
Patent
CA 2391462
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-H bonds relative to the amount of Si-H bonds in the starting compound. Preparation of these novel ammonolysis products comprises introducing a starting compound containing at least one Si-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 separated 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.
Cette invention concerne des produits d'ammonolyse comprenant des silazanes et des polysilazanes caractérises par des unités récurrentes de silicium-azote dans un composé polymère comportant un nombre de liaisons Si-H moins important que le composé de départ. On obtient ces produits d'ammonolyse en introduisant un composé de départ possédant au moins une liaison Si-H, tel qu'un halosilane, dans un excédent stoechiométrique d'ammoniac liquide, ce qui produit un halogénure d'ammonium lequel, en agissant comme catalyseur acide, produit le milieu ionique et/ou acide requis. Les produits d'ammonolyse ainsi obtenus sont retenus dans une couche en phase liquide séparée et distincte de l'ammoniac liquide anhydre renfermant l'halogénure d'ammonium ionisé. Sont également décrits des procédés permettant de purifier des produits d'ammonolyse et de modifier lesdits produits par une augmentation maîtrisée de la viscosité entre l'état liquide et l'état solide ainsi que des viscosités intermédiaires.
Abel Albert E.
Knasiak Gary J.
Kruger Tracy A.
Mouk Robert W.
Blake Cassels & Graydon Llp
Clariant Finance (bvi) Limited
Kion Corporation
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