Process for preparing favorably masked oil and/or gum and/or...

Details Process for preparing favorably masked oil and/or gum and/or... Process for preparing favorably masked oil and/or gum and/or...

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) B01J 13/00 (2006.01) C08G 18/70 (2006.01)

Patent

CA 2158747

A method for preparing aqueous emulsions of oils, gums or preferably masked (poly)isocyanate resins by kneading a mixture consisting of (1) a preferably masked (poly)isocyanate phase (A) with a viscosity of at least 3 Pa.s or a consistency of at least 200, and (2) an aqueous phase consisting of water, at least one surfactant (B) and optionally at least one water-soluble thickening polymer (C), the relative amounts of water, (B) and optionally (C) being such that said aqueous phase has a viscosity or consistency preferably no lower than that of the preferably masked (poly)isocyante phase (A), and said kneading being performed for a sufficient time and with sufficient shear to give an oil-in-water emulsion with a particle size of 0,1-5 mu m, and optionally by diluting the medium with water.

Procédé de préparation d'émulsions aqueuses d'huiles, gommes ou résines (poly)isocyanate(s) avantageusement masqué(s) par malaxage d'un mélange constitué (1) d'une phase (poly)isocyanate(s) avantageusement masqué(s) (A) de viscosité au moins égale à 3 Pa.s. ou de consistance d'au moins 200 et (2) d'une phase aqueuse constituée d'eau, d'au moins un agent tensioactif (B) et éventuellement d'au moins un polymère hydrosoluble épaississant (C), les quantités relatives d'eau, de (B) et éventuellement (C) étant telles que la viscosité ou consistance de la phase aqueuse soit de préférence au moins égale à celle de la phase (poly)isocyanate(s) avantageusement masqué(s) (A), le malaxage étant réalisé pendant une durée et avec un cisaillement suffisants pour obtenir une émulsion de type "huile dans eau" de granulométrie de 0,1 à 5 µm, puis dilution éventuelle du milieu avec de l'eau.

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