C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/78 (2006.01) C08G 63/183 (2006.01)
Patent
CA 2377603
The invention relates to a method for producing polyethylene terephthalate modified with phthalic acid units in such a way as to avoid high losses of phthalic acid during the esterification and the polycondensation and in such a way as to keep the advantageous application technology properties provided by the phthalic acid. According to the invention, a precondensate consisting of phthalic acid anhydride and ethylene glycol, produced without a catalyst, is added in the esterification and/or polycondensation stage. The ethylene glycol is used with a molar excess of 2 to 3.5 in relation to the phthalic acid anhydride.
L'invention concerne un procédé de production de polyéthylèntéréphthalat modifié par des unités d'acide o-phthalique permettant d'éviter des pertes importantes d'acide phthalique pendant l'estérification et la polycondensation tout en conservant les propriétés favorables en termes de technique d'application et dues à l'acide pthalique. Selon l'invention, on ajoute aux étapes d'estérification et/ou de polycondensation, un précondensat produit de façon non catalytique à partir de l'anhydride d'acide phthalique et d'éthylèneglycol. On utilise à cet effet de l'éthylèneglycol en excédent molaire de 2 à 3,5, par rapport à l'anhydride d'acide phthalique.
Munjal Sarat
Voerckel Volkmar
Wiegner Jens-Peter
Buna Sow Leuna Olefinverbund Gmbh
Smart & Biggar
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