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:
Mar. 10, 1998
Filed:
Jan. 26, 1996
Seiichiro Ima, Ichihara-shi, JP;
Eisuke Shiratani, Ichihara-shi, JP;
Shigeki Kishiro, Ichihara-shi, JP;
Sumitomo Chemical Company, Ltd., Osaka, JP;
Abstract
A film having a low dependency of film transparency on film-forming conditions and film thickness, and having superior transparency and rigidity without compromising the original properties of polypropylene film. The film is produced from a polypropylene prepared from a propylene polymer having (1) a stereoirregularity index mmrr/mmmm of a part insoluble in xylene at 20.degree. C. within the range of 0.0095 to 0.0200; (2) a melting temperature within the range of 145.degree. to 160.degree. C.; (3) a part soluble in xylene at 20.degree. C. of 3.5% by weight or less, the polypropylene having: (4) a melt flow rate at 230.degree. C. within the range of 5 to 15 g/10 min.; and (5) a swelling ratio within the range of 1.20 to 1.35.