Centre National De La Recherche Scientifique

Arkema France

Université Paul Sabatier (toulouse Iii)

Isochem

Centre De La Recherche Scientifique (cnrs)

Bianca Martin-Vaca

Didier Bourissou

Christophe Navarro

Stéphanie Magnet

Stéphanie Gazeau-Bureau

Olivier Thillaye Du Boullay

Emmanuel Marchal

The present invention relates to a process for the preparation of a lactone or lactam homopolymer, comprising the stage consisting in reacting a lactone or lactam with a nonpolymeric initiator comprising at least one hydroxyl or thiol functional group in a nonchlorinated solvent in the presence of a sulfonic acid of formula R&#x2014;SOH. It also relates to the polymer composition thus obtained and to its uses, in particular as antistatic additive.

Process for the preparation of polylactones and polylactams

The invention concerns a method for preparing poly(-hydroxy acids), the polymerization reaction being performed in controlled manner in the presence of a catalytic system including a base, said base being a 5- or 6-membered aromatic heterocycle comprising at least one endocyclic nitrogen atom, provided that when the base is used alone in the catalytic system, it does not represent pyridine, 2-methylpyridine, 2,6-dimethylpyridine or 2-methoxypyridine. The invention also concerns poly(-hydroxy acids) of formula (IV). Finally, the invention concerns the use of a poly(-hydroxy acid), obtainable by the inventive method, for vectoring active principles or for making biomaterials.

Method for controlled polymerization of o-carboxy anhydrides derived from &#x3b1;-hydroxy acids

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Toulouse, France

Bianca Martin-Vaca