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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.:

US 11407160 B1

PDFFull Text
Date of Patent:
Aug. 09, 2022

Filed:

Jun. 26, 2020

Mdo multilayer film

Applicant:

Nova Chemicals (International) S.a., Fribourg, CH;

Inventors:

Nitin Borse, Calgary, CA;

Norman Aubee, Okotoks, CA;

Assignee:

NOVA CHEMICALS (INTERNATIONAL) S.A., Fribourg, CH;

Attorney:

Thomas J. Styslinger

Primary Examiner:

Stella K Yi

Int. Cl.
CPC ...
B29C 48/21 (2019.01); B29C 48/08 (2019.01); B29C 48/00 (2019.01); B32B 27/08 (2006.01); B32B 27/18 (2006.01); B32B 27/32 (2006.01); B32B 7/02 (2019.01); B29C 55/00 (2006.01); B29C 55/06 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01); B29L 7/00 (2006.01); B29L 9/00 (2006.01); B29L 31/00 (2006.01);
U.S. Cl.
CPC ...
B29C 48/21 (2019.02); B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/08 (2019.02); B29C 55/005 (2013.01); B29C 55/06 (2013.01); B32B 7/02 (2013.01); B32B 27/08 (2013.01); B32B 27/18 (2013.01); B32B 27/32 (2013.01); B29K 2023/065 (2013.01); B29K 2105/0005 (2013.01); B29K 2995/0063 (2013.01); B29L 2007/008 (2013.01); B29L 2009/00 (2013.01); B29L 2031/712 (2013.01); B32B 2270/00 (2013.01); B32B 2307/516 (2013.01); B32B 2307/72 (2013.01); B32B 2439/00 (2013.01);
Abstract

A multilayer film having Machine Direction Orientation (MDO) is prepared by first co-extruding a multilayer film, then stretching the multilayer film in the machine direction at a temperature lower than the melting point of the polyethylene resin that is used to prepare the film. At least one layer of the film is a first polyethylene composition having a density of from about 0.94 to about 0.97 g/cc and at least one second layer is prepared from a polyethylene composition having a lower density than the first polyethylene composition. This disclosure enables the manufacture of films having outstanding barrier properties (low Water Vapor Transmission Rate, WVTR, and low Oxygen Transmission Rate, OTR) and good physical properties.

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