초록 ▼

A syndiotactic polypropylene copolymer is disclosed which comprises 70 to 99.9 mole % of propylene and 0.1 to 30 mole % of an olefin other than propylene; in the .sup.13 C-NMR spectrum of the syndiotactic polypropylene copolymer, a ratio of the intensity of a peak at about 20.2 ppm to the sum of the

A syndiotactic polypropylene copolymer is disclosed which comprises 70 to 99.9 mole % of propylene and 0.1 to 30 mole % of an olefin other than propylene; in the .sup.13 C-NMR spectrum of the syndiotactic polypropylene copolymer, a ratio of the intensity of a peak at about 20.2 ppm to the sum of the intensities of the total peaks attributable to methyl groups in propylene units at about 19-22 ppm being 0.3 or more. Also disclosed are extrusion-molded high-transparency articles, especially films and sheets and blown films, obtained by the extrusion of a polypropylene substantially having a syndiotactic structure.

대표청구항 ▼

[ What is claimed is:] [1.]1. An extruded article formed by the extrusion of a syndiotactic propylene homopolymer having a syndiotactic pentad fraction of at least 0.7. [8.]8. A syndiotactic propylene copolymer comprising 70 to 99 mole % of propylene and 1 to 30 mole % of an olefin other than propyl

[ What is claimed is:] [1.]1. An extruded article formed by the extrusion of a syndiotactic propylene homopolymer having a syndiotactic pentad fraction of at least 0.7. [8.]8. A syndiotactic propylene copolymer comprising 70 to 99 mole % of propylene and 1 to 30 mole % of an olefin other than propylene wherein in the .sup.13 C-NMR spectrum of said syndiotactic propylene copolymer, said copolymer exhibits a ratio of the intensity of a peak at about 20.2 ppm to the sum of the intensities of the total peaks attributable to methyl groups in propylene units at about 19-22 ppm of 0.3 or more.