Elastisches Polypropylengarn mit hoher Schrumpfung und daraus hergestellte Artikel

摘要

Polyolefin yarn capable of increased resiliency and shrinkage comprising continuous strand of multiple monofilament fibers or staple fibers of propylene polymer material optionally blended with polypropylene homopolymer, said propylene polymer material selected from the group consisting of, amounts expressed as weight %: (I) (a) random crystalline terpolymer consisting essentially of from about 96.0% to about 85.0% of propylene, from about 1.5% to about 5.0% ethylene and from about 2.5% to about 10.0% of an olefin selected from the group consisting of C4-C8 alpha-olefins; and (b) compositions of random crystalline propylene polymers comprising: (1) from about 30 to about 65% of a copolymer of from about 80 to about 98% propylene with a C4-C8 alpha-olefin; and (2) from about 35 to about 70% of a copolymer of propylene and ethylene and optionally from about 2 to about 10% of a C4-C8 alpha-olefin; said copolymer containing from about 2 to about 10% ethylene when said C4-C8 alpha-olefin is not present and from about 0.5 to about 5% ethylene when said C4-C8 alpha-olefin is present; and (c) compositions of random crystalline propylene polymers in combination with a predominantly ethylene copolymer consisting essentially of: (1) about 15-35% of a terpolymer of from about 90-93% propylene and about 2-3.5% ethylene and about 5-6% C4-C8 alpha-olefin; and (2) about 30-75% of a copolymer of from about 80-90% propylene with a C4-C8 alpha-olefin; and (3) about 20-60% of a copolymer of from about 91-95% ethylene with a C4-C8 alpha-olefin; and (d) random crystalline propylene polymer comprising from about 1.5 to about 20.0 weight percent ethylene or a C4-C8 alpha-olefin; and blends of (a), (b), (c) or (d); or (II) (a) 90-55 parts polypropylene homopolymer having an isotactic index greater than 90 and/or crystalline copolymer of propylene with (i) ethylene and/or (ii) an alpha -olefin of formula CH2=CHR, where R is a C2-C6 alkyl radical, comprising less than 10% of ethylene and/or alpha -olefin; and (b) 10-45 parts of an elastomeric copolymer of propylene with comonomers of ethylene and/or an alpha -olefin of formula CH2=CHR, where R is a C2-C6 alkyl radical containing from 50 to 70 parts by weight of comonomers, and from 10 to 40% by weight insoluble in xylene at ambient temperature. Composition (c) also can be prepared by blending, after polymerization, component (c)(3) with polymerized composition comprising components (c)(1) and (c)(2). Fabric, especially pile fabric such as carpeting is disclosed which is made from the resilient yarn and has improved appearance retention properties.