US 9,283,736 B2Granted

Multi-layer, ethylene polymer-based films with novel polypropylene blend-based stiffening layer

AssigneeLiqui-Box Corporation

InventorAlan Keith Breck

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Abstract

This invention discloses a multi-layer film for making pouches for containing flowable materials, said multi-layer film comprising generally five layers in order: inner sealant-layer, first interposed layer, the core layer, second interposed layer, and the outer sealant layer. The sealant and core layers are ethylene-based, and the interposed layers are polypropylene-based. The multi-layer film thickness is in the range of from about 35 microns to about 66 microns. The interposed layers comprise a novel polypropylene blend with a major component polypropylene and a minor component polypropylene, wherein the minor component polypropylene is a heterogeneous polypropylene interpolymer with a density in the range of from about 0.875 to about 0.91 g/cm3.

Claims14

Dependent claims

A multi-layer film for making pouches for containing flowable materials, said multi-layer film comprising the following layers in order, from an at least one inner sealant-layer to an at least one outer sealant-layer:

(A) said at least one inner sealant-layer comprising polyethylene that is selected from the group consisting of:
(i) an at least one low-density ethylene-alpha-olefin copolymer,
(ii) a blend of said at least one low-density ethylene-alpha-olefin homopolymer, wherein said ethylene homopolymer is made in a high-pressure polymerization process;
and
(iii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene copolymer, wherein said ethylene copolymer is made in a high-pressure polymerization process;
(B) a first at least one interposed layer adjacent to said at least one inner sealant-layer, said first at least one interposed layer comprising:
(i) an at least one polypropylene blend comprising a major component
polypropylene and a minor component polypropylene, wherein said major component polypropylene in the range of from about 50% to 90% of weight of said first at least one interposed layer, and said minor component polypropylene is in the range of from about 10% to about 49% of weight of said first at least one interposed layer;
(ii) optionally, an at least one ethylene-alpha-olefin copolymer;
and
(iii) optionally, a second ethylene-alpha-olefin copolymer that is not the same as said at least one ethylene-alpha-olefin copolymer in (B)(ii);
wherein the centerline of said first at least one interposed layer is closer to the centerline of said at least one inner sealant-layer than to the centerline of said multi-layer film;
(C) at least one core layer, adjacent to said first at least one interposed layer, said at least one core layer comprising polyethylene that is selected from the group consisting of:
(i) at least one low-density ethylene-alpha olefin copolymer,
(ii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene homopolymer, wherein said ethylene homopolymer is made in a high-pressure polymerization process;
and
(iii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene copolymer, wherein said ethylene copolymer is made in a high-pressure polymerization process;
(D) a second at least one interposed layer adjacent to said at least one core
(i) an at least one polypropylene blend comprising a major component polypropylene and a minor component polypropylene, wherein said major component polypropylene in the range of from about 50% to 90% of weight of said first at least one interposed layer, and said minor component polypropylene is in the range of from about 10% to about 49% of weight of said first at least one interposed layer;
(ii) optionally, an at least one ethylene-alpha-olefin copolymer;
and
(iii) optionally, a second ethylene-alpha-olefin copolymer that is not the same as said at least one ethylene-alpha-olefin copolymer in (D)(ii);
wherein the centerline of said second at least one interposed layer is closer to the centerline of said at least one outer sealant-layer than to the centerline of said multi-layer film;
and
(E) said at least one outer sealant-layer, comprising polyethylene that is selected from the group consisting of:
(i) an at least one low-density ethylene-alpha-olefin copolymer,
(ii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene homopolymer, wherein said ethylene homopolymer is made in a high-pressure polymerization process;
and
(iii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene copolymer, wherein said ethylene copolymer is made in a high-pressure polymerization process;
wherein said multi-layer film thickness is in the range of from about 35 microns to about 66 microns;
wherein a combined thickness of said first at least one interposed layer and said second at least one interposed layer is in the range of from about 10% to about 27% of the total thickness of said multi-layer film;
wherein a combined thickness of said inner sealant-layer and said outer sealant-layer is in the range of from about 10% to about 27% of the total thickness of said multi-layer film.

29 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/086,579Filed 14 Apr 2011 · us provisional application
Priority: 16 Apr 2010
Published: US 2011/0252746 A120 Oct 2011
Granted: 15 Mar 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/327
Comprising polyolefins : comprising polyolefins obtained by a metallocene or single-site catalyst
B65B 9/20
Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g.…:…

Family

Application61/324,858Us provisional application · filed 16 Apr 2010
US 2011/0252746 A1Pre-grant publication · published 20 Oct 2011
US 9,283,736 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

(A) said at least one inner sealant-layer comprising polyethylene that is selected from the group consisting of:
(i) an at least one low-density ethylene-alpha-olefin copolymer,
(ii) a blend of said at least one low-density ethylene-alpha-olefin homopolymer, wherein said ethylene homopolymer is made in a high-pressure polymerization process;
and
(iii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene copolymer, wherein said ethylene copolymer is made in a high-pressure polymerization process;
(B) a first at least one interposed layer adjacent to said at least one inner sealant-layer, said first at least one interposed layer comprising:
(i) an at least one polypropylene blend comprising a major component
polypropylene and a minor component polypropylene, wherein said major component polypropylene in the range of from about 50% to 90% of weight of said first at least one interposed layer, and said minor component polypropylene is in the range of from about 10% to about 49% of weight of said first at least one interposed layer;
(ii) optionally, an at least one ethylene-alpha-olefin copolymer;
and
(iii) optionally, a second ethylene-alpha-olefin copolymer that is not the same as said at least one ethylene-alpha-olefin copolymer in (B)(ii);
wherein the centerline of said first at least one interposed layer is closer to the centerline of said at least one inner sealant-layer than to the centerline of said multi-layer film;
(C) at least one core layer, adjacent to said first at least one interposed layer, said at least one core layer comprising polyethylene that is selected from the group consisting of:
(i) at least one low-density ethylene-alpha olefin copolymer,
(ii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene homopolymer, wherein said ethylene homopolymer is made in a high-pressure polymerization process;
and
(iii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene copolymer, wherein said ethylene copolymer is made in a high-pressure polymerization process;
(D) a second at least one interposed layer adjacent to said at least one core
(i) an at least one polypropylene blend comprising a major component polypropylene and a minor component polypropylene, wherein said major component polypropylene in the range of from about 50% to 90% of weight of said first at least one interposed layer, and said minor component polypropylene is in the range of from about 10% to about 49% of weight of said first at least one interposed layer;
(ii) optionally, an at least one ethylene-alpha-olefin copolymer;
and
(iii) optionally, a second ethylene-alpha-olefin copolymer that is not the same as said at least one ethylene-alpha-olefin copolymer in (D)(ii);
wherein the centerline of said second at least one interposed layer is closer to the centerline of said at least one outer sealant-layer than to the centerline of said multi-layer film;
and
(E) said at least one outer sealant-layer, comprising polyethylene that is selected from the group consisting of:
(i) an at least one low-density ethylene-alpha-olefin copolymer,
(ii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene homopolymer, wherein said ethylene homopolymer is made in a high-pressure polymerization process;
and
(iii) a blend of said at least one low-density ethylene-alpha-olefin copolymer and an at least one ethylene copolymer, wherein said ethylene copolymer is made in a high-pressure polymerization process;
wherein said multi-layer film thickness is in the range of from about 35 microns to about 66 microns;
wherein a combined thickness of said first at least one interposed layer and said second at least one interposed layer is in the range of from about 10% to about 27% of the total thickness of said multi-layer film;
wherein a combined thickness of said inner sealant-layer and said outer sealant-layer is in the range of from about 10% to about 27% of the total thickness of said multi-layer film.

29 more elements

Facts

Application

13/086,579Filed 14 Apr 2011 · us provisional application

Priority

16 Apr 2010

Published

US 2011/0252746 A120 Oct 2011

Granted

15 Mar 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/327
Comprising polyolefins : comprising polyolefins obtained by a metallocene or single-site catalyst
B65B 9/20
Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g.…:…