Fabrication and Basic Properties of Elastomeric Staple Fiber Based on Poly(Butylene Terephthalate)-Block-(Tetramethylene Oxide) by Melt Spinning

Melt spinning of special chips of poly(butylene terephthalate)-block-(tetramethylene oxide) was studied. The obtained fiber possesses rubber-like elasticity at room temperature. The basic properties of this elastomer fiber are fineness 1.7 dtex, tensile strength 3.35 cN/dtex, breaking extension 68%, and elastic recovery >95% at 15% elongation. A new type of elastomer staple fiber of this block-copolymer is successfully fabricated by a traditional production line for melt spinning.