PREPARATION OF MODIFIED POLYESTER

PROBLEM TO BE SOLVED: To provide an excellently productive method for manufacturing a modified polyester while suppressing the occurrence of diethylene glycol as a by-product which causes deterioration of characteristics of a polyester in manufacturing a modified polyester useful for a fiber dyeable...

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Bibliographische Detailangaben
Hauptverfasser:	NISHIYAMA KOKICHI, TOKUTAKE MASAHITO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an excellently productive method for manufacturing a modified polyester while suppressing the occurrence of diethylene glycol as a by-product which causes deterioration of characteristics of a polyester in manufacturing a modified polyester useful for a fiber dyeable with a basic dye. SOLUTION: A modified polyester containing at least 80 mole % of ethylene terephthalate constituting unit and 0.5-8 mole % of ethylene isophthalate constituting unit having a sulfonate salt group is manufactured. In this case, a dialkyl isophthalate ester having a sulfonate salt group, a 5 wt.% aqueous solution of which has a pH of at least 4.0, is added to a polyester oligomer composed mainly of an ethylene terephthalate unit, and the resultant mixture is kept at 240 deg.C or below for at least 10 min and subsequently subjected to polycondensation.