Polyester filament-forming polymer and its method of production

Abstract

Significantly higher productivity of polyester feed yarn is achieved when the polymer from which the feed yarn is melt spun is chain-branched with multifunctional chain branches having 1-15 microequivalents of reactive branching sites based on one gram of the polymer. This productivity increase (over conventional production employing the same spinnerette in accordance with teachings of the prior art as applied generally to unbranched polymers) may be achieved specifically by spinning a feed yarn (of the same filament denier and draw ratio) at a higher throughput rate at a higher windup speed followed by draw-texturing (at the same draw ratio to the same drawn denier); or by spinning at a higher throughput rate employing the same windup speed a feed yarn of higher denier and draw-ratio followed by draw-texturing at the higher draw ratio to the same drawn denier; or by any combination thereof. The invention herein claimed includes the specific polymer suitable for high throughput spinning as a new composition of matter and its production as a process improvement in the production of drawn polyester yarn.

Dependencies are inferred from the claim text.