Method for cleaning and decontaminating polyesters

Details Method for cleaning and decontaminating polyesters Method for cleaning and decontaminating polyesters

C - Chemistry, Metallurgy

08

J

C08J 11/06 (2006.01) C08J 11/16 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2343093

A method for treating polyesters comprises combining discrete particles of a polyester with an alkaline composition such that the alkaline composition coats the polyester particles. The particles are then heated in an environment that is at least substantially free of water. The method can be effectively used in cleaning, decontaminating and even increasing the intrinsic viscosity of polyester materials. Moreover, when used in the recovery of polyester materials containing contaminants and/or impurities, the method can provide a superior polyester product both in terms of intrinsic viscosity and color.

Un procédé de traitement de polyesters consiste à combiner des particules distinctes d'un polyester avec une composition alcaline de sorte que la composition alcaline recouvre les particules de polyester. Les particules sont ensuite chauffées dans un environnement qui est au moins sensiblement dépourvu d'eau. Le procédé peut être efficacement utilisé dans des procédés de nettoyage et de décontamination et même pour accroître la viscosité intrinsèque de matériaux polyester. De plus, lorsqu'on utilise le procédé pour récupérer des matériaux polyester contenant des contaminants et/ou des impuretés, ce dernier peut permettre d'obtenir un produit polyester de qualité supérieure aussi bien en termes de viscosité intrinsèque que de couleur.

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