CA2434451A1 - Heat shrinkable barrier bags with anti block additives - Google Patents

Heat shrinkable barrier bags with anti block additives Download PDF

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Publication number
CA2434451A1
CA2434451A1 CA002434451A CA2434451A CA2434451A1 CA 2434451 A1 CA2434451 A1 CA 2434451A1 CA 002434451 A CA002434451 A CA 002434451A CA 2434451 A CA2434451 A CA 2434451A CA 2434451 A1 CA2434451 A1 CA 2434451A1
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CA
Canada
Prior art keywords
layer
weight
vinyl acetate
composition
ethylene vinyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002434451A
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French (fr)
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CA2434451C (en
Inventor
Keith D. Lind
John Eckstein
Robert J. Blemberg
Roger L. Kaas
George H. Walbrun
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Coveris Flexibles US LLC
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Individual
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    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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    • B65D75/002—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers in shrink films
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    • Y10T428/31928—Ester, halide or nitrile of addition polymer

Abstract

A multilayer polymeric film having five layers (28, 22, 24, 26, and 30), wherein an antiblock additive and a slip additive may optionally and independently present in the layers. The film comprises layers (22 and 28) which comprise a blend of two EVA polymers and LLDPE, layer (24) which comprise vinylidene chloride methyl acrylate copolymer, layer (26) which comprises EVA, and layer (30) which comprises a blend of LLDPE and LDPE.

Claims (29)

1. A multiple layer polymer film, comprising:
a first layer, the composition of said first layer comprising a blend of an ethylene vinyl acetate copolymer; linear low density polyethylene; a second ethylene vinyl acetate copolymer and slip additive;
a second layer, the composition of said second layer comprising ethylene vinyl acetate copolymer and wherein each first and second layer having two surfaces;
a third layer, the composition of said third layer comprising vinylidene chloride methyl acrylate copolymer and wherein said third layer is disposed between said first and second layer;
a fourth layer, the composition of said fourth layer being the same as said first layer wherein said fourth layer is adhered to said first layer on the surface opposite said third layer; and a fifth layer, the composition of said fifth layer comprising a blend of linear low density polyethylene and low density polyethylene wherein said fifth layer is adhered to said second layer on the surface opposite said third layer; and wherein an antiblock additive and a slip additive may optionally and independently be present in layers 1, 2, 4 and 5 and wherein said antiblock additive may be a blend of two or more antiblock additives and wherein both of said slip additive and said antiblock additives are present at about 0.1 % -10 % , based on the total weight of the layer.
2. A multiple layer polymer film, comprising:
a first layer, the composition of said first layer comprising a blend of an ethylene vinyl acetate copolymer; linear low density polyethylene; a second ethylene vinyl acetate copolymer and slip additive;
a second layer, the composition of said second layer comprising ethylene vinyl acetate copolymer and wherein each first and second layer having two surfaces;
a third layer, the composition of said third layer comprising vinylidene chloride methyl acrylate copolymer and wherein said third layer is disposed between said first and second layer;
a fourth layer, the composition of said fourth layer being the same as said first layer wherein said fourth layer is adhered to said first layer on the surface opposite said third layer; and wherein said fourth layer further comprises an antiblock additive wherein said antiblock additive may be a blend of two or more antiblock additives and wherein both of said slip additive and said antiblock additives are present at about 0.1 % -10 %, based on the total weight of the layer; and a fifth layer, the composition of said fifth layer comprising a blend of linear low density polyethylene and low density polyethylene wherein said fifth layer is adhered to said second layer on the surface opposite said third layer.
3. The multiple layer polymeric film according to claim 1 wherein the composition of said first layer is a blend of 80 % by weight of ethylene vinyl acetate copolymer, 10% by weight of linear low density polyethylene, 9.65% of ethylene vinyl acetate copolymer and 0.35 % of slip additive.
4. The multiple layer polymeric film according to claim 1 wherein the composition of said second layer is 100 % by weight of ethylene vinyl acetate copolymer.
5. The multiple layer polymeric film according to claim 1 wherein the composition of said third layer is 98.1 % by weight of vinylidene chloride methyl acrylate copolymer and 1.9% by weight of additives.
6. The multiple layer polymeric film according to claim 2 wherein the ethylene vinyl acetate copolymer which comprises 80 % by weight of said first layer has a vinyl acetate content of 10%, a melt index of 0.35 g/10min and a density of 0.931 g/cm3.
7. The multiple layer polymeric film according to claim 2 wherein the ethylene vinyl acetate copolymer which comprises 9.65 % by weight of said first layer has a vinyl acetate content of 9.0%, a melt index of 2.0 g/10min and a density of 0.930 g/cm3.
8. The multiple layer polymeric film according to claim 3 wherein the composition of said second layer is 100% by weight of ethylene vinyl acetate copolymer and said ethylene vinyl acetate copolymer has a vinyl acetate content of 10%, a melt index of 0.35 g/10min and a density of 0.931 g/cm3.
9. The multiple layer polymeric film according to claim 1 wherein the composition of said fourth layer is a blend of 77.60 % by weight of ethylene vinyl acetate copolymer; 9.70 % by weight of linear low density polyethylene; 9.36 %
by weight of a second ethylene vinyl acetate copolymer; and 0.35 % by weight of slip additive, 1 % by weight of antiblock additive and 2% by weight of processing aids.
10. The multiple layer polymeric film according to claim 1 wherein the composition of said fifth layer is a blend of 90 % by weight of linear low density polyethylene and 10% by weight of low density polyethylene.
11. The multiple layer polymeric film structure according to claim 1 wherein the antiblock additive is Ampacet 10579.
12. The multiple layer polymeric film structure according to claim 1 wherein the antiblock additive is Ampacet 7012124.
13. The multiple layer polymeric film structure according to claim 1 wherein the antiblock additive is a blend of Ampacet 7012124 and Ampacet 10579.
14. The multiple layer polymeric film structure according to claim 1 wherein the antiblock additive blend is present up to 3 % of the total weight of the fourth layer.
15. A molecularly oriented multiple layer polymeric film comprising:
a first layer, the composition of said first layer comprising a blend of an ethylene vinyl acetate copolymer; linear low density polyethylene; a second ethylene vinyl acetate copolymer; and slip additive;
a second layer, the composition of said second layer comprising ethylene vinyl acetate copolymer and wherein each first and second layer having two surfaces;
a third layer, the composition of said third layer comprising vinylidene chloride methyl acrylate copolymer and wherein said third layer is disposed between said first and second layer;
a fourth layer, the composition of said fourth layer being the same as said first layer wherein said fourth layer is adhered to said first layer on the surface opposite said third layer; and wherein said fourth layer further comprises an antiblock agent wherein said antiblock agent may be a blend of two or more antiblock agents and wherein both of said slip additive and said antiblock agents are present at about 0.1%-10%, based on the total weight of the layer; and a fifth layer, the composition of said fifth layer comprising a blend of linear low density polyethylene and low density polyethylene wherein said fifth layer is adhered to said second layer on the surface opposite said third layer.
16. The molecularly oriented multiple layer film according to claim 15 wherein the composition of said first layer is a blend of 80% by weight of ethylene vinyl acetate copolymer; 10% by weight of linear low density polyethylene;
9.65%
by weight of a second ethylene vinyl acetate copolymer; and 0.35% by weight of slip additive.
17. The molecularly oriented multiple layer film according to claim 15 wherein the composition of said second layer is 100% by weight of ethylene vinyl acetate copolymer.
18. The molecularly oriented multiple layer film according to claim 15 wherein the composition of said third layer is 98.1% by weight of vinylidene chloride methyl acrylate copolymer and 1.9% by weight of additive.
19. The molecularly oriented multiple layer film according to claim 15 wherein the ethylene vinyl acetate copolymer which comprises 80% by weight of said first layer has a vinyl acetate content of 10%, a melt index of 0.35 and a density of 0.931 g/cm3.
20. The molecularly oriented multiple layer film according to claim 15 wherein the ethylene vinyl acetate copolymer which comprises 9.65% by weight of said first layer has a vinyl acetate content of 9.0%, a melt index of 2.0 and a density of 0.930 g/cm3.
21. The molecularly oriented multiple layer film according to claim 15 wherein the composition of said second layer is 100% by weight of ethylene vinyl acetate copolymer and said ethylene vinyl acetate has a vinyl acetate content of 10%, a melt index of 0.35 g/ 10min and a density of 0.931 g/cm3.
22. The molecularly oriented multiple layer film according to claim 15 wherein the composition of said fourth layer is a blend of 77.6% by weight of ethylene vinyl acetate copolymer; 9.70% by weight of linear low density polyethylene; 9.36% by weight of a second ethylene vinyl acetate copolymer;
and 0.35% by weight of slip additive, 1% by weight of an antiblock agent and 2% by weight of processing aids.
23. The molecularly oriented multiple layer film according to claim 10 wherein the composition of said fifth layer is a blend of 90% by weight of linear low density polyethylene and 10% by weight of low density polyethylene.
24. A bag made from the film of claim 2.
25. A bag made from the film of claim 15.
26. A multiple layer polymeric film comprising:
a first layer, the composition of said first layer comprising a blend of 80%
by weight ethylene vinyl acetate copolymer, 10% by weight of linear low density polyethylene; 9.65% by weight of a second ethylene vinyl acetate copolymer; and 0.35% by weight of slip additive.

a second layer, the composition of said second layer comprising 100% ethylene vinyl acetate copolymer and wherein each first and second layer having two surfaces;

a third layer, the composition of said third layer comprising 100% vinylidene chloride methyl acrylate copolymer and wherein said third layer is disposed between said first and second layer;

a fourth layer, the composition of said fourth layer being the same as said first layer wherein said fourth layer is adhered to said first layer on the surface opposite said third layer; and wherein said fourth layer further comprises an antiblock additive wherein said antiblock additive may be a blend of two or more antiblock additives and wherein both of said slip additive and said antiblock additives are present at about 0.1%-10%, based on the total weight of the layer; and a fifth layer, the composition of said fifth layer comprising a blend of 90%
linear low density polyethylene and 10% by weight of low density polyethylene wherein said fifth layer is adhered to said second layer on the surface opposite said third layer.
27. A multiple layer polymeric film according to claim 26 wherein the composition of said fourth layer comprises 77.60% by weight of ethylene vinyl acetate copolymer, 9.7% by weight of linear low density polyethylene, 9.36% by weight of a second ethylene vinyl acetate copolymer, 0.34% by weight of slip additive, 1.0% by weight of an antiblock additive and 2% by weight of processing aids.
28. A multiple layer polymeric film according to claim 26 which can be molecularly oriented.
29. A bag made from the film of claim 27.
CA2434451A 2001-01-11 2001-12-17 Heat shrinkable barrier bags with anti block additives Expired - Fee Related CA2434451C (en)

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US09/758,843 2001-01-11
US09/758,843 US6531198B2 (en) 1993-06-24 2001-01-11 Heat shrinkable barrier bags with anti block additives
PCT/US2001/048876 WO2002055386A2 (en) 2001-01-11 2001-12-17 Heat shrinkable barrier bags with anti block additives

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AT (1) ATE376515T1 (en)
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DE (1) DE60131103T2 (en)
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US6531198B2 (en) 2003-03-11
DE60131103D1 (en) 2007-12-06
CA2434451C (en) 2011-09-20
NZ527356A (en) 2005-04-29
US20010003624A1 (en) 2001-06-14
DE60131103T2 (en) 2008-08-07
WO2002055386A3 (en) 2002-12-12
EP1368229A4 (en) 2004-07-21
BR0116825A (en) 2004-02-03
EP1368229A2 (en) 2003-12-10
MXPA03006189A (en) 2004-03-10
EP1368229B9 (en) 2008-09-24
ES2298289T3 (en) 2008-05-16
ATE376515T1 (en) 2007-11-15
AU2002245151B2 (en) 2007-05-31
EP1368229B1 (en) 2007-10-24
WO2002055386A2 (en) 2002-07-18

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