Facile synthesis of polyhedral silsesquioxane anions and use...

C - Chemistry – Metallurgy – 01 – B

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C01B 33/113 (2006.01) B05D 1/18 (2006.01)

Patent

CA 2543109

Polyhedral silsesquioxane anions are economically prepared by reaction of a silica source derived from combusted organic material with a quaternary ammonium hydroxide compound. Reaction of the resulting anions with chlorosilanes may be effected in near stoichiometric fashion in organic solvent containing reactive quantities of organic acids such as formic acid. The functional groups on the resulting functionalized silsesquioxanes may be substituted for other functional groups by reaction with di- or polysiloxanes in the presence of a synthetic ion exchange resin.

L'invention concerne un procédé pour préparer des anions polyèdres de silsesquioxane, de manière peu onéreuse, consistant à faire réagir une source de silice dérivée d'un matériau organique brûlé avec un composé hydroxyde d'ammonium quaternaire. La réaction des anions résultants avec des chlorosilanes peut être effectuée de manière quasi-stoechiométrique, dans un solvant organique contenant des quantités réactives d'acides organiques tels que l'acide formique. Les groupes fonctionnels des silsesquioxanes fonctionnalisés obtenus peuvent être substitués par d'autres groupes fonctionnels par réaction avec des disiloxanes ou des polysiloxanes, en présence d'une résine synthétique d'échange ionique.

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