Particulate catalyst and catalyst/stabilizer systems for the...

C - Chemistry – Metallurgy – 08 – G

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C08G 63/82 (2006.01)

Patent

CA 2705416

The invention relates to a method for producing high-molecular-weight homopolyesters and copolyesters of L-, D- OR D, L-lactic acid, comprising the following steps: i) polycondensation of lactic acid or polytransesterification of esters thereof to form a polymer lactic acid, ii) cyclodepolymerisation of the polymer lactic acid to form dilactides, and iii) ring-opening polymerisation of the dilactides or mixtures thereof with suitable comonomers. The invention is characterised in that, in at least one of the method steps i) to iii), a particulate catalyst and/or a particulate stabiliser, each having an average particle diameter of between 1 and 100 nm, is/are used in a heterogeneous reaction mixture.

L'invention concerne un procédé de production d'homopolyesters et de copolyesters d'acide lactique L, D ou D,L ayant un poids moléculaire élevé, comprenant les étapes suivantes : i) polycondensation d'acide lactique ou polytransestérification d'esters d'acide lactique en acide lactique polymère ; ii) dépolymérisation cyclisante de l'acide lactique polymère en dilactides ; et iii) polymérisation par ouverture de cycle des dilactides ou de mélanges de ceux-ci avec des comonomères appropriés. Selon l'invention, on utilise dans au moins une des étapes i) à iii), dans un mélange réactif hétérogène, un catalyseur particulaire et/ou un stabilisateur particulaire qui présentent respectivement un diamètre moyen de particules de 1 à 100 nm.

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