# US 9,517,611 B2 · Multi-layer low temperature shrink film

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- Number: US 9,517,611 B2
- Document ID: US9517611B2
- Status: Granted
- Kind: B2
- Application number: 13/036,974
- Filed: 2011-02-28
- Published: 2012-03-01
- Granted: 2016-12-13
- Earliest claimed: 2010-02-26
- Assignees: Coveris Flexibles US LLC
- Applicants: Gabriel Pittelli
- Inventors: Gabriel Pittelli
- Web page: https://patentgrep.com/patent/US9517611B2

## CPC

- B32B 27/327: {comprising polyolefins obtained by a metallocene or single-site catalyst}
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 2250/05: 5 or more layers
- B32B 2250/246: All polymers belonging to those covered by groups B32B27/32 and B32B27/30
- B32B 2307/7242: Non-permeable
- B32B 2307/7244: Oxygen barrier
- B32B 2307/736: Shrinkable
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24992: Density or compression of components
- Y10T 428/31924: Including polyene monomers
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A multi-layer low temperature heat shrink film comprising an abuse layer comprising styrene-butadiene block copolymer; a first tie layer comprising ethylene vinyl acetate; a gas barrier layer comprising polyvinylidene chloride; a second tie layer comprising ethylene vinyl acetate; and a sealant layer comprising a metallocene-catalyzed sealant, is disclosed.

## Claims

### Claim 1

A multi-layer film consisting of:
an abuse layer defining a first outer layer of the film, the abuse layer comprising styrene-butadiene block copolymer;
a first tie layer comprising ethylene vinyl acetate;
a gas barrier layer comprising polyvinylidene chloride;
a second tie layer comprising ethylene vinyl acetate; and
a sealant layer defining a second outer layer of the film, the sealant layer comprising a metallocene-catalyzed polymer, wherein the metallocene-catalyzed polymer is at least one of linear low density polyethylene or ultra low density polyethylene.

### Claim 2 (depends on 1)

The film of claim 1, wherein the thickness of the abuse layer comprises about 11% to about 12% of total film thickness.

### Claim 3 (depends on 2)

The film of claim 2, wherein the thickness of the first tie layer comprises about 5% to about 15%, the thickness of the gas barrier layer comprises about 5% to about 15%, the thickness of the second tie layer comprises about 35% to about 55%, and the thickness of the sealant layer comprises about 5% to about 15%, each based on the total film thickness.

### Claim 4 (depends on 3)

The film of claim 3, wherein the abuse layer is about 12%, the first tie layer is about 14%, the gas barrier layer is about 9%, the second tie layer is about 54%, and the sealant layer is about 11%, based on total film thickness.

### Claim 5 (depends on 1)

The film of claim 1, wherein the film has a total thickness of about 1.5 mils to about 2.5 mils.

### Claim 6 (depends on 1)

The film of claim 1, wherein the styrene-butadiene block copolymer comprises about 75 wt % polystyrene based on the total weight of the polystyrene and butadiene.

### Claim 7 (depends on 1)

The film of claim 1, wherein the first tie layer and the second tie layer, independently, have a density of between about 0.92 g/cm3 and about 0.98 g/cm3.

### Claim 8 (depends on 7)

The film of claim 7, wherein the density of each tie layer is about 0.942 g/cm3.

### Claim 9 (depends on 1)

The film of claim 1, wherein the metallocene-catalyzed polymer is metallocene-catalyzed linear low density polyethylene.