Process for preparing polyesters

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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560 94, C08G 6318

Patent

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040974685

ABSTRACT:
In a process for the preparation of high molecular weight linear polyesters of terephthalic acid which comprises partially esterifying terephthalic acid with an alkylene glycol under direct esterification conditions and then further esterifying and polycondensing the partially esterified product, the molecular weight distribution of the polyester is narrowed by correlating the carboxyl conversion with the reacted glycol to terephthalic acid mol ratio in various steps of a multistep process.

REFERENCES:
patent: 3689461 (1972-09-01), Balint et al.
patent: 3697579 (1972-10-01), Balint et al.
patent: 3849379 (1974-11-01), Jeurissen et al.

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