| 摘要 |
<p>The claims cover polyolefin fibres and yarns with high strength and elongation at break produced by melt processing, especially fibres with capillary titres of 1-10 dtex, elongation at break > 130% and tensile strength NOTLESS 15 cN/tex that are not redrawn, and textile fabrics produced from them. They consist of polypropylene mixtures containing 0.05-10, preferably 0.2-3 wt.% modified propylene polymers (I) with melt indices of 0.1-50, preferably 1-40 g/10 minutes at 230 degrees C/2.16 kg and a ratio of intrinsic viscosity of (I) to the intrinsic viscosity of the unmodified polypropylene of the same weight average molecular weight (Mw) of 0.20-0.95. (I) are obtained by (a) treating propylene homopolymers and/or copolymers of propylene and ethylene and/or 4-18 carbon (C) alpha -olefins with polyfunctional ethylenically unsaturated monomers in the presence of ionising radiation and/or thermal free radical initiators; or (b) reacting functionalised polypropylene, preferably containing acid and/or acid anhydride groups, with polyfunctional compounds of opposite reactivity, preferably 2-16 C diamines and/or 2-16 C diols. Also claimed is a method of making these materials.</p> |
