Polypropylene monofilament and tape fibers exhibiting certain creep-strain characteristics and corresponding crystalline configurations

摘要: Unique thermoplastic (polypropylene, specifically) monofilament and/or tape fibers and yarns that exhibit heretofore unattained physical properties are provided. Such basically manufactured through the extrusion of resins include a certain class nucleating agent therein, able to be drawn at high ratios with such agents present, tenacity modulus strength much higher than other previously produced (particularly those under commercial conditions), particularly also simultaneously extremely low shrinkage rates. Thus, require presence compounds quickly effectively provide rigidity target (for example, polypropylene), after heat-setting. Generally, these any structure nucleates polymer crystals within exposure sufficient heat melt initial pelletized allowing an oriented cool. The must nucleate temperature without during cooling. In manner, “rigidifying” nucleator nucleation sites for crystal growth. preferred dibenzylidene sorbitol based compounds, as well less [2.2.1]heptane-bicyclodicarboxylic acid, otherwise known HPN-68, sodium benzoate, talc, lithium phosphate salts [such 2,2′-methylene-bis-(4,6-di-tert-butylphenyl)phosphate, NA-11]. Specific methods manufacture inventive fibers, fabric articles made therefrom, encompassed this invention.