The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2001
Filed:
Jan. 18, 1994
Tadashi Asanuma, Chiba, JP;
Tetsunosuke Shiomura, Tokyo, JP;
Nobutaka Uchikawa, Osaka, JP;
Tateyo Sasaki, Osaka, JP;
Osamu Uchida, Wezembeek-Oppem, BE;
Tutomu Iwatani, Osaka, JP;
Shigeru Kimura, Osaka, JP;
Takeo Inoue, Saitama, JP;
Mitsui Chemicals, Inc., , JP;
Abstract
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,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.