Process to prepare a polyester polymer composition comprising a polyester polymer having furanic units and a polyester polymer composition obtainable thereby and the use thereof

A process to prepare a polyester polymer composition comprising a polyester polymer having furanic units, wherein the process comprises the step of:

• reacting a cyclic polyester oligomer in the presence of a catalyst in a ring-opening polymerization step under conditions of a reaction temperature and a reaction time sufficient to yield a polyester polymer having furanic units, wherein either:
• (I) the cyclic polyester oligomer comprises the structure:
• wherein each of the groups A is an optionally-substituted linear, branched or cyclic alkyl, phenyl, aryl, or alkylaryl group, and m is an integer from 1 to 20,
• and the polyester polymer having furanic units comprises the structure:
• wherein A is as previously defined and n is an integer from 10 to 1,000,000 such that the polyester polymer has a number average molar mass (Mn) relative to Polystyrene Standards ranging between 10,000 and 10,000,000 g/mol as determined by Gel Permeation Chromatography,
• or (II) the cyclic polyester oligomer comprises the structure:
• wherein each of the groups B is an optionally-substituted linear, branched or cyclic alkyl, phenyl, aryl, or alkylaryl group, and n′ is an integer from 1 to 20, and m is as previously defined,
• and the polyester polymer having furanic units comprises the structure:
• wherein B, n′ and n are as previously defined.