Method for the preparation of oligomeric alkylene terephthalates

Details Method for the preparation of oligomeric alkylene terephthalates Method for the preparation of oligomeric alkylene terephthalates

1979-08-13

1981-09-15

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

422134, 528309, C07C 6982

Patent

active

042898951

ABSTRACT:
Oligomeric alkylene terephthalates having an average degree of condensation of 4 to 7 are produced by passing dimethylterephthalate and diol having at least 3 carbon atoms downwardly through a series of reaction chambers, each outfitted with stirring and heating means employed so that the temperature increases from stage to stage. Thereby transeterification is effected. The chambers are interconnected so that the methanol evolved in each chamber is vented without being admixed with the material undergoing transesterification in any of the other chambers. The transesterification product is then condensed at elevated temperature and under vacuum to produce the oligomer. The oligomers are high reactivity so that the further condensation thereof to polyesters is simplified.

REFERENCES:
patent: 3245762 (1966-04-01), Ullrich et al.
patent: 3385881 (1968-05-01), Bachmann et al.
patent: 3507905 (1970-04-01), Gerantet et al.
patent: 4066627 (1978-01-01), Borman

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