Silane treated inorganic pigments

Details Silane treated inorganic pigments Silane treated inorganic pigments

C - Chemistry, Metallurgy

09

C

C09C 3/12 (2006.01) C09C 1/36 (2006.01)

Patent

CA 2243434

The present invention provides a process for the production of hydrophobic inorganic oxide products which comprises reacting the inorganic oxide particles with organohalosilanes, preferably organochlorosilanes, to produce hydrophobic organosilane coated inorganic oxides. It is preferred that the organohalosilane compounds be reacted with the inorganic oxide particles in an aqueous slurry and subjected to intense mixing. The inorganic oxide pigments prepared by the processes of this invention have essentially quantitative retention of the organosilanes and contain no adsorbed aldehydes on their surface. The by-products produced in the preferred embodiments of the invention are innocuous salts, which are environmentally safe and readily disposable.

Procédé de production de produits d'oxydes inorganiques hydrophobes consistant à faire réagir les particules d'oxydes inorganiques avec des organohalosilanes, de préférence des organochlorosilanes, pour produire des oxydes inorganiques hydrophobes à revêtement organosilane. De préférence, on fait réagir les composés d'organohalosilane avec les particules d'oxyde inorganiques dans une suspension aqueuse et on les soumet à un mélange intensif. Les pigments d'oxydes inorganiques préparés selon les procédés décrits assurent une rétention sensiblement quantitative des organosilanes et ne contiennent pas d'aldéhydes adsorbés sur leur surface. Les sous-produits obtenus dans les modes de réalisation préférés sont des sels anodins, ne présentant pas de danger pour l'environnement et pouvant être éliminés facilement.

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