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:
Sep. 20, 1983
Filed:
Jun. 11, 1981
Applicant:
Inventor:
Fukashi Hashimoto, Yokkaichi, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08L / ; B29D / ;
U.S. Cl.
CPC ...
526351 ; 2642907 ; 2642902 ;
Abstract
This invention relates to biaxially oriented polypropylenefilm and method for its production. The method for its production comprises a step of fusing and extruding polypropylene in a sheet form, a step of cooling and solidifying a formed polypropylene film, a step of preheating it and a step of orienting it in a longitudinal direction and finally in a lateral direction, characterized in that a longitudinal orientation of the polypropylene film is carried out by at least a double-stage process. The polypropylene film thus biaxially oriented has improved rigidity.