Stable lactide particles

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/00 (2006.01)

Patent

CA 2670934

The present invention is directed to stable lactide particles, more specifically lactide particles which are stable enough to be stored and transported at room temperature and have a quality high enough for use as starting material for polylactic acid. The lactide particle has a surface/volume ratio of lower than 3000 m-1. Preferably the lactide in the particle has an optical purity of at least 95%. The lactide particles are prepared by subjecting lactide to a shaping step comprising extrusion, pastillation, prilling, tabletting, or flaking.

L'invention concerne des particules de lactide stables, et plus spécifiquement des particules de lactide suffisamment stables pour être stockées et transportées à température ambiante et présentant une qualité suffisamment élevée pour être utilisées comme matière de départ pour un acide polylactique. Une particule de lactide présente un rapport surface/volume inférieur à 3000 m-1. Le lactide de la particule possède, de préférence une pureté optique d'au moins 95%. Les particules de lactide sont préparées par soumission d'un lactide à une étape de mise en forme comprenant une extrusion, et la formation de granulés, de comprimés ou de flocons.

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