Mini-emulsions and latexes therefrom

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 283/00 (2006.01) C08F 2/00 (2006.01) C08F 2/22 (2006.01) C08F 2/24 (2006.01) C08F 289/00 (2006.01) C08F 290/00 (2006.01) C08F 291/00 (2006.01) C08L 51/00 (2006.01) C08L 51/08 (2006.01) C09D 151/00 (2006.01) C09D 151/08 (2006.01)

Patent

CA 2747567

A hybrid alkyd acrylic latex and a process for its preparation are taught. The process comprises forming an oil phase comprising an alkyd, a drier, and at least one ethylenically unsaturated monomer, wherein the oil phase solubilizes the drier; combining the oil phase with an aqueous phase, wherein the aqueous phase comprises a surfactant, to form a pre-emulsion; ho-mogenizing the pre-emulsion thereby forming a miniemulsion, wherein the drier is solubilized in the oil phase; initiating the poly-merization by adding a free radical initiator, thereby polymerizing the at least one ethylenically unsaturated monomer in the miniemulsion and forming a latex polymer emulsion having latex polymer particle sizes in the range of 40 nm to 700 nm.

L'invention concerne un latex alkyde-acrylique hybride et un procédé pour le préparer. Le procédé comprend la formation d'une phase huileuse comprenant un alkyde, un agent dessiccateur et au moins un monomère à insaturation éthylénique, la phase huileuse solubilisant l'agent dessiccateur ; la combinaison de la phase huileuse avec une phase aqueuse, la phase aqueuse comprenant un tensioactif, afin de former une pré-émulsion ; l'homogénéisation de la pré-émulsion, en formant ainsi une miniémulsion, l'agent dessiccateur étant solubilisé dans la phase huileuse ; l'initiation de la polymérisation par addition d'un initiateur de radicaux libres, en polymérisant ainsi le ou les monomères à insaturation éthylénique dans la miniémulsion et en formant une émulsion de polymère de latex dont la taille de particules de latex est comprise dans l'intervalle de 40 nm à 700 nm.

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