Hydrophilic aromatic polyester fiber

A conjugate fiber comprising as at least one component consisting of at least one aromatic polyester resin composition comprising (a) 100 parts by weight of an aromatic polyester resin and (b) 0.2 and 30 parts by weight of at least one water-insoluble polyoxyethylene polyether polymer, said water-insoluble polyoxyethylene polyether polymer satisfying all of the requirements (i) to (iii):

• (i) the polyoxyethylene polyether polymer is a non-random copolymer type polyoxyethylene polyether polymer of the formula (I):
• ##STR18## 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 a member selected from a hydrogen atom, a monovalent hydrocarbon groups having 1 to 40 carbon atoms, and monovalent acyl groups having 2 to 40 carbon atoms, and monovalent acyl groups having 2 to 40 carbon atoms, k is an integer of from 1 to 6, l is an integer satisfying the relationship of k x l.gtoreq.70, and m is an integer of 1 or more,
• (ii) the polyoxyethylene type polyether has a number average molecular weight of 5,000 to 16,000;
• and
• (iii) in the formula II), R.sup.1, R.sup.2, l and m satisfy the following relationships:
• when k is an integer of 1, ##EQU12## and when k is an integer of 2 to 6, ##EQU13## wherein [M(R.sup.1 O)] represents the molecular weight of the radical R.sup.1 O and [M(R.sup.2)] represents the molecular weight of the radical R.sup.2.