Small particle size polyester/acrylic hybrid latexes

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 283/02 (2006.01) C08F 257/02 (2006.01) C08F 265/04 (2006.01) C08F 283/04 (2006.01) C08L 51/08 (2006.01) C09D 11/00 (2006.01) C09D 151/08 (2006.01)

Patent

CA 2245146

This invention provides the preparation of water-dispersible polyester/acrylic hybrids via a two-stage emulsion polymerization process. For example, methacrylic acid and/or 2-hydroxyethyl methacrylate are copolymerized with styrene/acrylic monomers to yield a relatively hydrophilic and hydro- plasticized first stage. Subsequent additions of hydrophobic monomers to this first stage "seed" result in an inversion of the latex such that the more hydrophilic first stage is at the particle surface. This results not only in improved stability of the resulting latex without the use of additional surfactants, as evidenced by the production of reduced amounts of coagulum, while it also offers relatively low minimum filming temperatures due to the hydroplasticization of the shell of the particle. Furthermore, the use of the water-dispersible polyester results in extremely fine latex particle sizes which can significantly enhance coating properties such as film gloss and clarity.

Préparation d'hybrides polyester/acrylique dispersibles dans l'eau par un procédé de polymérisation en émulsion à deux étapes. C'est ainsi que, par exemple, de l'acide méthacrylique et/ou du 2-hydroxyéthyle méthacrylate sont copolymérisés avec des monomères styrène/acrylique pour que le produit résultant de la première étape soit relativement hydrophile et hydro-plastifié. Les adjonctions consécutives de monomères hydrophobes à ce premier produit constituant une "amorce" entraînent une inversion du latex de telle sorte que le premier produit le plus hydrophile se retrouve à la surface des particules. Il en résulte non seulement une amélioration de la stabilité du latex ainsi obtenu, sans utilisation de tensioactifs supplémentaires comme en atteste la production de faibles quantités de coagulat, tout en permettant des températures minimales de formation de films relativement faibles grâce à l'hydroplastification de la coque de la particule. En outre, l'utilisation d'un polyester dispersible dans l'eau permet d'obtenir un calibre extrèmement petit des particules de latex qui contribue largement à l'amélioration des qualités de revêtement tels que le brillant et la clareté.

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