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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 10239676 B1

PDFFull Text
Date of Patent:
Mar. 26, 2019

Filed:

Oct. 10, 2014

Flexible film composition for heat seals and container with same

Applicant:

Dow Global Technologies Llc, Misland, MI (US);

Inventors:

Chuan Yar Lai, Freeport, TX (US);

Kurt Brunner, Zurich, CH;

Jozef J.i. Van Dun, Horgen, CH;

Nicolas C. Mazzola, Jundiai, BR;

Maria Isabel Arroyo Villan, Tarragona, ES;

Assignee:

Dow Global Technologies LLC, Midland, MI (US);

Attorney:
Primary Examiner:

James C Yager

Int. Cl.
CPC ...
B65D 65/02 (2006.01); B32B 7/12 (2006.01); B32B 27/06 (2006.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 27/34 (2006.01); B32B 27/36 (2006.01); B32B 7/02 (2019.01);
U.S. Cl.
CPC ...
B65D 65/02 (2013.01); B32B 7/02 (2013.01); B32B 7/12 (2013.01); B32B 27/065 (2013.01); B32B 27/08 (2013.01); B32B 27/304 (2013.01); B32B 27/306 (2013.01); B32B 27/32 (2013.01); B32B 27/325 (2013.01); B32B 27/327 (2013.01); B32B 27/34 (2013.01); B32B 27/36 (2013.01); B32B 2270/00 (2013.01); B32B 2274/00 (2013.01); B32B 2307/31 (2013.01); B32B 2307/582 (2013.01); B32B 2307/72 (2013.01); B32B 2439/46 (2013.01);
Abstract

The present disclosure is directed to compositions and film structures suitable for heat seal production. The heat sealable flexible film structure includes: a layer (A) comprising a blend comprising from 35 to 80 percent by weight of the layer (A) of a propylene based plastomer or elastomer ('PBPE') and from 20 to 65 percent by weight of the layer (A) of a low density polyethylene having a density in the range of from 0.915 g/cmto 0.935 g/cm, wherein the blend has a melt index (as determined according to ASTM D 1238 (at 190° C./2.16 Kg); a layer (B), adjacent to layer (A), comprising a polyolefin-based polymer, wherein the polymer or polymer blend which makes up layer (B) flows more easily than the blend of layer (A) under conditions intended for making a hard seal with the film structure; and an outermost layer (C) comprising a material having a melting point greater than 140° C.; wherein the ratio of the thickness of layer (B) to the thickness of layer (A) is 3:1 or greater. The heat sealable flexible film structure is used to make a flexible container having one or more heat seals. The heat seal can be a frangible heat seal, a hard heat seal, or a combination of frangible heat seals and hard heat seals depending on the sealing conditions.

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