Polyester feed yarn for draw-texturing

Claim 1

A polyester feed yarn for drawtexturing, having an elongation at break of about 30 to 150 percent, of filaments having deniers within the range of 2 to 8, and comprising the following types of filaments: (A) 20 to 40 percent (based on the total number of filaments) of filaments consisting of a polymer of about 97 to 100 mole percent ethylene terephthalate structural units and about 3 to 0 mole percent of polymer structural units which contain sulfonate groups as pendant parts of repeating units in the polymer chain, (B) 20 to 40 percent (based on the total number of filaments) of filaments consisting of a polymer of about 85 to 95 mole percent ethylene terephthalate structural units and about 15 to 5 mole percent of other ester units forming a copolyester therewith, and (C) 15 to 35 weight percent (based on the total weight of the yarn) of eccentric bicomponent filaments wherein 20 to 80 percent of this filament cross section consists of a component having the same composition as type (A) and the remainder of the cross section consists of a component having the same composition as type (B); the bicomponent filaments having an average denier smaller than any of the other filaments, an elongation at break averaging less than 80 percent of the break elongation of any of the other filaments, and the property of forming helical crimp when the filaments are hot drawn and broken.