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. 25, 2012
Filed:
Apr. 04, 2008
Sylvie Desjardins, Lake Jackson, TX (US);
Marc A. Springs, Angleton, TX (US);
Phillip D. Hustad, Manvel, TX (US);
Nathan J. Wiker, Houston, TX (US);
Jesus Nieto, Cambrils, ES;
Wayde V. Konze, Missouri City, TX (US);
Sylvie Desjardins, Lake Jackson, TX (US);
Marc A. Springs, Angleton, TX (US);
Phillip D. Hustad, Manvel, TX (US);
Nathan J. Wiker, Houston, TX (US);
Jesus Nieto, Cambrils, ES;
Wayde V. Konze, Missouri City, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
The instant invention is a polyethylene film, and method of making the same. The polyethylene film according to instant invention includes at least one heterogeneously branched ethylene/α-olefin copolymer having a density in the range of about 0.910 to about 0.930 g/cm, a molecular weight distribution in the range of about 2.8 to 3.8, a melt index (I) in the range of about 0.3 to about 4 g/10 min, and an I/Iratio in the range of 6.5 to about 7.8. The film has a normalized dart impact strength of equal or greater than (6666-7012*density) g/mil, a normalized tear strength of equal or greater than (440*e−(density−0.915)/2*(0.00949)) g/mil, and a haze in the range of 3 to 10 percent. The method of making the polyethylene film according to instant invention includes the following steps: (1) providing at least one heterogeneously branched ethylene/α-olefin copolymer having a density in the range of about 0.910 to about 0.930 g/cm, a molecular weight distribution in the range of about 2.8 to 3.8, a melt index (I) in the range of about 0.3 to about 4 g/10 min, and an I/Iratio in the range of 6.5 to about 7.8; (2) processing the heterogeneously branched ethylene/α-olefin copolymer via blown film extrusion process or cast film extrusion process; and (3) thereby forming a film having a normalized dart impact strength of equal or greater than (6666-7012*density) g/mil, a normalized tear strength of equal or greater than (440*e−(density−0.915)/2*(0.00949)) g/mil, and a haze in the range of 3 to 10 percent.