| 摘要 |
<p>Polyolefin yarn capable of increased shrinkage comprising continuous strand of multiple monofilament fibers or staple fibers of propylene polymer material consisting essentially of at least about 5 parts by weight, but less than 50 parts by weight of syndiotactic propylene polymer having a syndiotactic pentad fraction of 0.7 or more, blended with crystalline isotactic propylene polymer, each propylene polymer material independently selected from the group consisting of: (I) homopolymers of propylene; and (II) random crystalline propylene copolymers, terpolymers or both, consisting essentially of from about 80 to about 98.5% of propylene; and from about 1.5 to about 20.0% of at least one comonomer selected from the group consisting of ethylene and C4-C8 alpha-olefins; said copolymer preferably containing from about 2 to about 10% ethylene when said C4-C8 alpha-olefin is not present; and said terpolymer preferably containing from about 0.5 to about 5% ethylene when said C4-C8 alpha-olefin is present; and including mixtures of such copolymers and terpolymers, wherein said amounts are expressed as weight %. Fabric, especially pile fabric such as carpeting is disclosed which is made from the yarn and has improved appearance retention properties.</p> |
