Inline solid state polymerization of pet flakes for...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/183 (2006.01) C08G 63/80 (2006.01) C08J 11/04 (2006.01) C08J 11/06 (2006.01)

Patent

CA 2227952

The present invention describes a process of making strap using both post consumer and non-post consumer PET of wide distribution intrinsic viscosity (IV) through direct solid state polymerization in a flaked state to product PET with increased, heterogenous IV suitable for high performance strap extrusion. The process increases the IV of post-consumer resins, consisting principally of polyethylene terephthalate (PET), by chopping the post-consumer plastic into flakes and chunks, rolling the flakes and chunks, preheating the flakes, and further heating the flakes and chunks preheated flakes in an atmosphere of hot nitrogen gas, thereby increasing the intrinsic viscosity. PET polymers having increased viscosities according to the present invention provide a polymer useful in manufacturing high performance strap.

La présente invention concerne un procédé de fabrication de courroies à partir de plastiques recyclés et de plastiques non recyclés, principalement du polyéthylène téréphtalate (PET), de viscosité intrinsèque très variée, par polymérisation directe à l'état solide de flocons pour produire un PET de viscosité intrinsèque hétérogène et améliorée se prêtant bien à l'extrusion. Le procédé de cette invention comporte les opérations suivantes : déchiquetage des plastiques recyclés en flocons et morceaux, laminage des flocons et des morceaux, préchauffage des flocons et chauffage des flocons et des morceaux dans une atmosphère d'azote chaud pour en augmenter la viscosité intrinsèque. Les polymères fabriqués selon ce procédé conviennent à la fabrication de courroies hautes performances.

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