Abstract: A polyethylene terephthalate (PET) polymer having diacid units derived from diacid compounds, said diacid units comprising: a) from 92.50 mol % to 97.75 mol % of terephthalic units derived from terephthalic acid (TA) or an ester thereof, and b) from 2.25 mol % to 7.50 mol % of 2,5-FDCA units derived from 2,5-furandicarboxylic acid (2,5-FDCA) or an ester thereof, and—diol units derived from diol compound(s), the diol units having monoethylene glycol units derived from monoethylene glycol (MEG), as well as to a method to prepare such a PET polymer. The use of a 2,5-FDCA compound selected from 2,5-furandicarboxylic acid (2,5-FDCA) and esters thereof as an anti-crystallization comonomer in a PET polymer and a bio-based PET polymer in which the anti-crystallisation comonomer is bio-based.

Abstract: The invention relates to a polyethylene terephthalate (PET) polymer comprising:—diacid units derived from diacid compounds, said diacid units comprising: a) from 92.50 mol % to 97.75 mol % of terephthalic units derived from terephthalic acid (TA) or an ester thereof, and b) from 2.25 mol % to 7.50 mol % of 2,5-FDCA units derived from 2,5-furandicarboxylic acid (2,5-FDCA) or an ester thereof, and—diol units derived from diol compound(s), said diol units comprising monoethylene glycol units derived from monoethylene glycol (MEG), as well as to a method to prepare such a PET polymer. The invention relates also to the use of a 2,5-FDCA compound selected from 2,5-furandicarboxylic acid (2,5-FDCA) and esters thereof as an anti-crystallization comonomer in a PET polymer. The invention relates also to a bio-based PET polymer in which the anti-crystallisation comonomer is bio-based.

Abstract: A method of making a bottle (1) made of at least one thermoplastic polymer of at least one FuranDiCarboxylic Acid (FDCA) monomer and at least one diol monomer, comprising the steps of: providing a preform, placing the preform in a mold, blowing the preform to form the bottle (1) comprising an envelop (2) defining a housing, wherein, at the step of blowing the preform, the mold is heated at a temperature greater than or equal to 50° C., preferably comprised between 50° C. and 100° C., more preferably between 65° C. and 85° C.