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:
Dec. 18, 2007
Filed:
May. 08, 2002
Jun'ichi Masuda, Kyoto, JP;
Shigeru Tanaka, Yasu-gun, JP;
Tai Sasamoto, Yokohama, JP;
Masatoshi Ohkura, Otsu, JP;
Jun'ichi Masuda, Kyoto, JP;
Shigeru Tanaka, Yasu-gun, JP;
Tai Sasamoto, Yokohama, JP;
Masatoshi Ohkura, Otsu, JP;
Toray Industries, Inc., , JP;
Abstract
A biaxially stretched polypropylene film of the present invention has high stiffness in the film longitudinal direction and can be manufactured by a conventional longitudinal-transverse sequential biaxial stretching method, since the biaxially stretched polypropylene film comprises a polypropylene which comprises a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230° C. or consists of a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230° C. and/or a Trouton ratio of the polypropylene is controlled at a specific value, moreover, the biaxially stretched polypropylene film contains regulated longitudinal fibrils.