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. 24, 2004
Filed:
Apr. 02, 2002
Applicant:
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 2/732 ;
U.S. Cl.
CPC ...
B32B 2/732 ;
Abstract
A plastic film having a desirable balance of physical properties is prepared using a pseudohomogeneous linear low density polyethylene (lldpe) resin on a blown film extrusion line. The lldpe used in this invention must have a melt index, I , of from 0.4 to 0.8 grams per 10 minutes, a base resin density of from 0.915 to 0.919 grams per cubic centimeter and a copolymer/homopolymer (COHO) ratio of from 3 to 9. The film must be prepared under specific extrusion conditions using a specific annular extrusion die. The film of this invention has a dart impact strength of greater than 600 grams per mil and a machine direction tear strength of greater than 350 grams per mil and is suitable for the preparation of packaging and trash bags.