Preparation of polyesters

Details Preparation of polyesters Preparation of polyesters

C - Chemistry, Metallurgy

08

G

402/205

C08G 63/82 (2006.01)

Patent

CA 1123994

ABSTRACT OF THE DISCLOSURE The formation of manganese-derivative scale in equipment involved in polyester manufacture is reduced by introduction of a sterically hindered benzoic acid in approximately stoichiometric amount. The acids include 2,6-dichloro-, 2,6-dimethyl- and 2,4,6-trimethylbenzoic acids. The scale is believed to be insoluble manganese terephthalate, presumably formed by reaction of manganese acetate catalyst generated as a result of dimethyl terephtha- late with excess ethylene glycol. Preferably an alkali metal salt of an organic acid, such as sodium acetate or lithium acetate is also used to give a synergistic effect in combination with the hindered acid.

329925

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