Stable, constant particle size, aqueous emulsions of...

C - Chemistry – Metallurgy – 04 – B

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C04B 41/49 (2006.01)

Patent

CA 2354083

This invention relates to a stable aqueous silane emulsion with constant particle size. The emulsion comprises a continuous water phase, a discontinuous silane phase, and an emulsifier system. The emulsifier system contains a primary surfactant and a cosurfactant. The primary surfactant functions to prevent coalescence of particles, by steric or ionic repulsion between particles. The cosurfactant prevents diffusion of the silane into the aqueous phase. The combination of primary surfactant and cosurfactant results in an adsorbed inner layer of cosurfactant between the silane and the outer layer of a mixture of both surfactants which contacts the water phase. The combination of primary surfactant and cosurfactant provides a barrier which prevents diffusion of silane into the water phase. A method for preparing the emulsion is also disclosed.

L'invention concerne une émulsion aqueuse de silane, stable et possédant une dimension particulaire constante. Cette émulsion comprend une phase aqueuse continue, une phase silane discontinue et un système émulsifiant, lequel contient un premier tensioactif ainsi qu'un co-tensioactif. Le premier tensioactif a pour fonction d'empêcher les particules de coalescer, par répulsion stérique ou ionique entre celles-ci, tandis que le co-tensioactif empêche la diffusion du silane dans la phase aqueuse. La combinaison du premier tensioactif et du co-tensioactif permet d'obtenir une couche intérieure de tensioactif, adsorbée entre le silane et la couche extérieure d'un mélange des deux tensioactifs entrant en contact avec la phase aqueuse, et elle constitue une barrière empêchant la diffusion du silane dans la phase aqueuse. L'invention concerne également un procédé de préparation de cette émulsion.

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