Fibers and fibrous moldings using the same

摘要

The present invention relates to fibers comprising propylene-ethylene copolymer consisting of 0.01 to 15 mol% of ethylene units and 99.99 to 85 mol% of propylene units as at least one component, wherein a) a chain constitution of the copolymer found by means of nuclear magnetic resonance spectrum has the following relationships: a-1) in three monomers chain units (triad) in main chains of the copolymer, there is a relationship of formula (I): $between\; a\; fraction\; of\; propylene\; unit\; -\; ethylene\; unit\; -\; propylene\; unit\; chain\; (PEP)\; and\; a\; total\; content\; of\; ethylene\; unit\; (C2),\; when\; PEP\; being\; positive,\; and\; a-2)\; in\; three\; monomer\; chain\; units\; (triad)\; in\; main\; chains\; of\; the\; copolymer,\; there\; is\; a\; relationship\; of\; formula\; (II):$ between\; a\; fraction\; of\; three\; continuous\; ethylene\; units\; chain\; (EEE)\; and\; a\; total\; content\; of\; ethylene\; unit\; (C2),\; as\; well\; as\; a-3)\; a\; ratio\; of\; total\; alpha\; ,\; beta\; -methylene\; carbon\; atoms\; (N\; alpha\; beta\; )\; to\; total\; propylene\; units\; is\; within\; a\; range\; of\; 0\; to\; 1.2\; mol\%,\; b)\; a\; weight\; average\; molecular\; weight\; (Mw)\; is\; 50,000\; to\; 1,500,000,\; as\; well\; as\; c)\; a\; ratio\; (Mw/Mn)\; of\; a\; weight\; average\; molecular\; weight\; (Mw)\; to\; a\; number\; average\; molecular\; weight\; (Mn)\; is\; 1.2\; to\; 3.8;\; and\; the\; use\; of\; said\; fibers\; in\; a\; non-woven\; fabric,\; a\; knitted\; textile,\; a\; filter\; and\; an\; absorbent\; article.$$