Centre National De La Recherche Scientifique

Societe De Conseils De Recherches Et D'applications Scientifiques (s.c.r.a.s.)

Other

Ipsen Pharma S.a.s.

Centre National De La Recherche Scientifique-cnrs

Ipsen Pharma

Anca Dumitrescu

Jean-Bernard Cazaux

Didier Bourissou

Guy Bertrand

Blanca Martin-Vaca

Heinz Gornitzka

Roland Cherif-Cheikh

Frederic Lacombe

Frédéric Lacombe

Lidija Vranicar

Martin-Vaca Blanca

A catalytic lactide and glycolide copolymerization system comprising a trifluoromethane sulfonate as a catalyst and copolymerization additive and a copolymerization process.

Catalytic lactide and glycolide (co)polymerization system

The invention concerns the use of zinc derivatives of general formula (I) wherein: Lrepresents a group of formula: &#x2014;E(R)(R')(R&#x2033;), &#x2014;E(R) (R&#x2032;) or &#x2014;E(R); E is an atom of group 15; Land Lindependently represent a group of formula: &#x2014;E(R)(R&#x2032;)(R&#x2033;), &#x2014;E(R)(R&#x2032;) or &#x2014;E(R), or together form a chain of formula &#x2014;L&#x2032;&#x2014;A&#x2014;L&#x2032;&#x2014;; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L&#x2032;and L&#x2032;independently represent a group of formula &#x2014;E(R)(R&#x2032;) &#x2014;E(R) or &#x2014;E&#x2014;; Eis an element of group 14; Eis an element of group 15; Eis an element of group 16; R, R&#x2032;, R&#x2033;, R, R&#x2032;and Rrepresent various groups, as (co) polymerisation catalysts of cyclic esters 

Use of zinc derivatives as cyclic ester polymerization catalysts

A subject of the present invention is new compounds having a lanthanide and having a tridentate ligand, a process for their preparation and their use in particular as polymerization catalysts.

Polymerization catalysts

The use of stannylenes and germylenes of general formula (I) wherein: M represents a tin or geranium atom; Land Lindependently represent a group of formula: -E(R) (R') (R&#x2033;), -E(R) (R&#x2032;) or -E(R)) or together form a chain of formula -L&#x2032;-A- L&#x2032;; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L&#x2032;and L&#x2032;, represent, independently, a group of formula: -E(R) (R&#x2032;)-, E(R)- or -E-; Eis an element of group 14; Eis an element of group 15; Eis an element of group 16; R, R&#x2032;, R&#x2033;, R, R&#x2032;and Rrepresent variable groups as polymerization catalysts of heterocycles.

Use of stannylenes and germylenes as polymerization catalysts for heterocycles

Polymerisation catalyst

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Toulouse, France

Anca Dumitrescu