Process for finishing a resin from an emulsion polymerized...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 6/14 (2006.01) C08C 1/14 (2006.01) C08C 3/00 (2006.01) C08F 6/00 (2006.01) C08F 6/22 (2006.01)

Patent

CA 2201551

A process for finishing latex to form a dry resin and the resulting product. The process includes coagulating a latex of a thermoplastic polymer at a temperature at or just above the agglomeration temperature of the resin, dewatering the resin slurry to form a resin cake, drying the resin cake using extrusion technology to form a resin melt and solidifying the resin melt to form the resin. Preferred processes of the invention also include finishing the resin, such as by pelletizing and/or grinding it. More preferred processes of the invention include collecting and neutralizing the aqueous liquid byproducts from the dewatering and drying steps of the process. One embodiment of the invention includes utilizing water to solidify the resin melt, pelletizing the resin and drying the pellets. Most preferred processes of the invention include recycling any aqueous liquid byproducts of the solidifying and/or pellet drying steps, and recycling dried resin that is outside of the specification back into the resin cake drying step. Dried resins of the invention can have a moisture of not greater than 1.0% by weight and a residuals concentration of not greater than 500 ppm.

Procédé pour la finition d'un latex et l'obtention d'une résine asséchée; produit ainsi obtenu. Le procédé consiste à coaguler un latex de polymère thermoplastique à la température d'agglomération de la résine ou juste au-dessus, à essorer la suspension de résine pour former un gâteau de résine, à assécher le gâteau par extrusion pour obtenir une résine fondue, et enfin à solidifier celle-ci pour obtenir la résine finale. L'invention privilégie la finition de la résine, comme la granulation et (ou) le broyage. On privilégie également la collecte et la neutralisation des produits secondaires liquides aqueux lors de l'essorage et du séchage. L'une des réalisations de l'invention consiste à utiliser l'eau pour solidifier la résine fondue, à granuler celle-ci et à sécher les granules. L'invention privilégie surtout le recyclage de tous les produits secondaires liquides aqueux de de la solidification et (ou) du séchage des granules, ainsi que le recyclage de la résine sèche, non conforme aux spécifications, vers le séchage du gâteau de résine. La teneur en humidité et la concentration de résidus des résines asséchées ne doivent pas dépasser respectivement 1,0 % en poids et 500 ppm.

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