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:
Feb. 12, 2002
Filed:
Sep. 19, 2000
Mamoru Takahashi, Yamaguchi, JP;
Mitsui Chemicals Inc, Tokyo, JP;
Abstract
The present invention provides a packaging film which exhibits excellent mechanical strength properties such as high dart impact strength with retaining properties of transparency and film surface smoothness. The ethylene resin packaging film comprises an ethylene/&agr;-olefin copolymer having the following properties: the density is in the range of 0.918 to 0.935 g/cm ; the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.05 to 1.0 g/10 min; the decane-soluble component fraction (W) at room temperature and the density (d) satisfy the relation W<80×exp(−100(d−0.88))+0.1; the flow index (FI), which is defined as a shear rate at which the shear stress of said copolymer in a molten state at 190° C. reaches 2.4×10 dyne/cm , and MFR satisfy the relation FI>75×MFR; and the melt tension (MT) at 190° C. and MFR satisfy the relation MT>2.2×MFR .