Use of catalytic system for lactide and glycolide (co) oligomerization

A catalytic system comprising:

• (a) a strongly acidic ion-exchange resin polymeric catalyst (1), and (b) a (co)oligomerization additive of general formula (2)
• R1-E-R2 (2)
• wherein:
• E represents an element of group 16;
• R1 represents a hydrogen or deuterium atom;
• R2 represents a hydrogen or deuterium atom, or a group of formula -E14(R14)(R′14)(R″14);
• wherein:
• E14 is an element of group 14;
• R14, R′14 and R″14 represent, independently, a hydrogen atom;
• a deuterium atom;
• or a substituted or non-substituted alkyl, cycloalkyl or aryl,
• wherein said substituent or substituents comprise:
• halos, hydroxys, alkyls, alkoxys, cycloalkyls, cycloalkoxys, aryls, aryloxys, carboxys, alkoxycarbonyls, cycloalkoxycarbonyls and aryloxycarbonyls or mixtures thereof;
• for the (co)oligomerization of lactide and glycolide by ring opening.

A method for ring-opening lactide and glycolide (co)oligomerization comprising, bringing together at least one monomer, an oligomerization solvent, and a catalytic system comprising:

• (a) a strongly acidic ion-exchange resin-type polymeric catalyst (1), and
• (b) a (co)oligomerization additive of general formula (2)
• R1-E-R2 (2)
• wherein:
• E represents an element of group 16;
• R1 represents a hydrogen or deuterium atom;
• R2 represents a hydrogen or deuterium atom, or a group of formula -E14(R14)(R′14)(R″14);
• wherein:
• E14 is an element of group 14;
• R14, R′14 and R″14 represent, independently, a hydrogen atom;
• a deuterium atom;
• or one of the following substituted or non-substituted radicals:
• alkyl, cycloalkyl or aryl,
• wherein said substituent or substituents comprise:
• halos, hydroxys, alkyls, alkoxys, cycloalkyls, cycloalkoxys, aryls, aryloxys, carboxys, alkoxycarbonyls, cycloalkoxycarbonyls and aryloxycarbonyls or mixtures thereof;