Process for the preparation of a polyester
AssigneeSynvina C.V.
InventorLaszlo Sipos
Life of this patent
Estimating the term…
Abstract
A polyester including ethylene 2,5-furandicarboxylate units is prepared in a process, where in an esterification step a 2,5-furandicarboxylate compound is reacted with ethylene glycol to form an ester composition, including components with 2-hydroxyethyl and 2,5-furandicarboxylate moieties; where in a polycondensation step the ester composition thus obtained is subjected to polycondensation at reduced pressure in the presence of a polycondensation catalyst to obtain a polycondensate; and where during the polycondensation step 2,5-furandicarboxylic acid is added to the ester composition.
Claims19
A process for the preparation of a polyester comprising ethylene 2,5-furandicarboxylate units, wherein in an esterification step a 2,5-furandicarboxylate compound is reacted with ethylene glycol to form an ester composition, comprising components with 2-hydroxyethyl and 2,5-furandicarboxylate moieties;
- wherein in a polycondensation step the ester composition thus obtained is subjected to polycondensation at reduced pressure in the presence of a polycondensation catalyst to obtain a polycondensate;
- and wherein during the polycondensation step 2,5-furandicarboxylic acid is added to the ester composition.
A polyester comprising ethylene 2,5-furandicarboxylate units, which polyester has a number average molecular weight as determined by gel permeation chromatography (GPC) using polystyrene as standard, of at least 10,000, and which polyester has a hydroxyl end group content in the range of 65 to 120, determined by 1H-NMR in deuterated 1,1,2,2-tetrachloro ethane.
Dependencies are inferred from the claim text.