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. 17, 1996
Filed:
Jul. 07, 1995
Shinsuke Tanaka, Tokuyama, JP;
Manabu Kaminaka, Tokuyama, JP;
Isao Masada, Tokuyama, JP;
Junichi Fujii, Tokuyama, JP;
Naoki Ueda, Tokuyama, JP;
Tokuyama Corporation, Yamaguchi-ken, JP;
Abstract
An at least monoaxially stretched polypropylene film made of a composition comprising a crystalline polypropylene and a monocyclic olefin polymer (e.g. a polycyclobutene or a polycyclopentene), wherein the content of the monocyclic olefin polymer is 0.1-1,000 ppm by weight. The polypropylene film is superior not only in transparency but also in image clarity by which an image is clearly seen through the film. The polypropylene film, when further comprising talc having an average particle diameter of 0.1-10 .mu.m in an amount of 50-4,000 ppm by weight, can prevent the surface roughening or edge roughening of sheet during the sheet formation conducted before stretched film production. The polypropylene film, when further comprising an anti-blocking agent and a polyethylene together, can prevent the generation of voids caused by the anti-blocking agent.