Biodegradable flexographic ink

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/10 (2006.01)

Patent

CA 2473519

The present invention relates to a flexographic water based ink in which a biodegradable polymer, such a polyhydroxyalkanoate (PHA), replaces conventional poorly or non-biodegradable organic polymeric resins for example. PHAs are used as a latex suspension in water, thus the present invention relates to a novel pigment/latex mixture. PHA in a latex form is a fluid vehicle in which all the other components necessary to provide a flexographic ink are added, i.e., pigments, wax and/or binder, as well as a solvent, if necessary. The PHAs are mainly responsible for the biodegradability of the flexographic water based ink. The present invention relates also a method to produce a flexographic water based composition with enhanced biodegradability properties.

La présente invention a trait à une encre flexographique à base d'eau dans laquelle un polymère biodégradable, tel qu'un polyhydroxyalcanoate (PHA), remplace des résines polymériques classiques peu ou non biodégradables par exemple. Les PHA sont utilisés sous la forme d'une suspension de latex dans l'eau, donc la présente invention a trait à un nouveau mélange pigment/latex. Le PHA sous forme de latex constitue un véhicule fluide dans lequel tous les constituants requis pour former une encre flexographique sont ajoutés, c'est à dire, des pigments, de la cire et/ou un liant, ainsi qu'un solvant, le cas échéant. Les PHA sont principalement responsables de la biodégradabilité de l'encre flexographique à base d'eau. L'invention a également trait à un procédé de production d'une composition aqueuse avec des propriétés améliorées de biodégradabilité.

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