Hydrogenation of polyester oligomers containing terephthalic...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 63/199 (2006.01) B01J 23/40 (2006.01) C07C 67/303 (2006.01) C08G 63/91 (2006.01)

Patent

CA 2474744

Disclosed is a process of hydrogenating a polyester oligomer containing terephthalic acid residues wherein terephthalic acid residues are converted to residues of 1,4-cyclohexanedicarboxylic acid. Also disclosed is a process for the preparation of polyesters containing 1,4-cyclohexanedicarboxylic acid residues by first hydrogenating a polyester oligomer containing terephthalic acid residues and then reacting the resulting oligomer with one or more polyester-forming reactants to produce a higher molecular weight polyester.

Procédé d'hydrogénation d'un oligomère de polyester contenant des résidus d'acide téréphtalique, lesdits résidus étant transformés en résidus d'acide 1,4-cyclohexanedicarboxylique. L'invention concerne aussi un procédé de préparation de polyesters contenant des résidus d'acide 1,4-cyclohexanedicarboxylique, qui comporte les étapes consistant à hydrogéner d'abord un oligomère de polyester contenant des résidus d'acide téréphtalique ; et à mettre ensuite à réagir l'oligomère obtenu avec un ou plusieurs réactifs formant un polyester afin de produire un polyester de masse moléculaire élevée.

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