Dai-ichi Kogyo Seiyaku Co., Ltd.

Teijin Limited

Noboru Chujo

Shigeo Mori

Togi Suzuki

An aromatic polyester shaped article, for example, a fiber, a film or a sheet, having excellent hydrophilic characteristics and a durable antistatic property, sweat-absorbing property and soil-releasing property, is prepared from an aromatic polyester composition comprising (a) 100 parts by weight of an aromatic polyester resin, (b) 0.2 to 30 parts by weight a water-insoluble polyoxyethylene type polyether represented by the formula (I): ##STR1## wherein Z is a residue of an organic compound having 1 to 6 active hydrogen atoms and a molecular weight of 300 or less, R.sup.1 is an unsubstituted or substituted alkylene group having at least 6 carbon atoms, R.sup.2 is H, a monovalent hydrocarbon group having 1 to 40 carbon atoms, or a monovalent acyl group having 2 to 40 carbon atoms, k is 1 to 6, l satisfies the relationship: k x l.gtoreq.70 and m is 1 or more, and having a number average molecular weight of 5000 to 16000, said R.sup.1, R.sup.2, l and m in the formula (I) satisfying the following relationships: ##EQU1## wherein [M(R.sup.1 O)] is a molecular weight of the R.sup.1 O and [M(R.sup.2)] is a molecular weight of the R.sup.2.

Hydrophilic aromatic polyester fiber

An aromatic polyester shaped article, for example, a fiber, a film or a sheet, having excellent hydrophilic characteristics and a durable antistatic property, sweat-absorbing property and soil-releasing property, is prepared from an aromatic polyester composition comprising (a) 100 parts by weight of an aromatic polyester resin, (b) 0.2 to 30 parts by weight a water-insoluble polyoxyethylene type polyether represented by the formula (I):

Aromatic polyester resin composition and fiber

This invention relates to a method of producing a modified polyester having high fiber whiteness and satisfactory dyeability. In producing a polyester at least 80% of whose repeating structural units are ethylene terephthalate units, at least one specified polyalkylene glycol having a potassium and sodium content not more than 3 ppm and an average molecular weight not less than 400 is added for copolymerization. The method enables production of a polyester with a high degree of whiteness and, moreover, a polyester with excellent static-proofness and dyeability.

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Joyo, Japan

Noboru Chujo