# US 2024/0198641 A1 · Shrink film and package

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- Number: US 2024/0198641 A1
- Document ID: US20240198641A1
- Status: Published application
- Kind: A1
- Application number: 18/287,280
- Filed: 2021-04-22
- Published: 2024-06-20
- Earliest claimed: 2021-04-22
- Assignees: Amcor Flexibles North America, Inc.
- Applicants: Amcor Flexibles North America, Inc.
- Inventors: Frank E. SECKAR; Jeffery C. LAWSON
- Web page: https://patentgrep.com/patent/US20240198641A1

## CPC

- B29C 48/08: flexible, e.g. films
- B32B 27/08: of synthetic resin
- B29C 48/023: {Extruding materials comprising incompatible ingredients}
- B29C 48/21: the layers being joined at their surfaces
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/18: characterised by the use of special additives
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- C08L 23/04: Homopolymers or copolymers of ethene
- B32B 2250/03: 3 layers
- B32B 2250/04: 4 layers
- B32B 2250/05: 5 or more layers
- B32B 2250/24: All layers being polymeric
- B32B 2264/00: Composition or properties of particles which form a particulate layer or are present as additives
- B32B 2264/0257: Polyolefin particles, e.g. polyethylene or polypropylene homopolymers or ethylene-propylene copolymers
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/31: Heat sealable
- B32B 2307/40: having particular optical properties
- B32B 2307/406: Bright, glossy, shiny surface
- B32B 2307/408: Matt, dull surface
- B32B 2307/412: Transparent
- B32B 2307/414: Translucent
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/581: Resistant to cut
- B32B 2307/7244: Oxygen barrier
- B32B 2307/7246: Water vapor barrier
- B32B 2307/736: Shrinkable
- B32B 2307/7376: Thickness
- B32B 2307/748: Releasability
- B32B 2439/70: Food packaging
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A fully coextruded shrink film is disclosed. The film includes a first polar polymer layer, a bonding layer, and a sealant layer. The bonding layer includes a blend of a bonding material and a compatibilizer material. The sealant layer is a first outer layer. The bonding layer including the compatibilizer material is positioned between the first polar polymer layer and the sealant layer. The film includes a shrinkage value of greater than 10% in each of the machine direction and the transverse direction when tested according to ASTM D2732-03 using a bath temperature of 90 degrees Celsius (° C.).

## Claims

### Claim 1

A fully coextruded, shrink film comprising:
a first polar polymer layer;
a bonding layer; and
a sealant layer;
wherein the bonding layer comprises a blend of a bonding material and a compatibilizer material, wherein the sealant layer is a first outer layer of the film, wherein the bonding layer comprising the compatibilizer material is positioned between the first polar polymer layer and the sealant layer, and wherein the film includes a Shrinkage Value of greater than 10% in each of the machine direction and the transverse direction when tested according to ASTM D2732-03 using a bath temperature of 90 degrees Celsius (° C.).

### Claim 2 (depends on 1)

The film of claim 1, wherein the first polar polymer layer comprises one or more of an ethylene vinyl alcohol copolymer, a polyamide, and a polyester.

### Claim 3 (depends on 1)

The film of claim 1, wherein the first polar polymer layer is a second outer layer of the film.

### Claim 4 (depends on 1)

The film of claim 1, further comprising a second polar polymer layer positioned between the first polar polymer layer and the sealant layer.

### Claim 5 (depends on 1)

The film of claim 1, wherein the bonding layer comprises the compatibilizer material in an amount from 5% to 35% by weight of the first polar polymer layer.

### Claim 6 (depends on 4)

The film of claim 4, wherein the bonding layer comprises the compatibilizer material in an amount from 5% to 35% by weight of the second polar polymer layer.

### Claim 7 (depends on 1)

The film of claim 1, further comprising an intermediate layer comprising the compatibilizer material.

### Claim 8 (depends on 1)

The film of claim 1, wherein the compatibilizer material comprises one or more of a low molecular weight anhydride and a carboxylic acid functionalized polyethylene.

### Claim 9 (depends on 1)

The film of claim 1, wherein the bonding material comprises a polyethylene polymer, an ethylene acrylic acid (EAA) copolymer, a two-component reactive adhesive, or combinations thereof.

### Claim 10 (depends on 1)

The film of claim 1, wherein the film is recyclable.

### Claim 11 (depends on 1)

The film of claim 1, comprising an average interlayer bond strength of greater than about 8 grams per millimeter (g/mm).

### Claim 12 (depends on 1)

A package comprising the film of claim 1.

### Claim 13

A fully coextruded, shrink film comprising:
a first polar polymer layer comprising a polyamide;
a first bonding layer comprising a compatibilizer material and a bonding material;
a second polar polymer layer comprising an ethylene vinyl alcohol (EVOH) copolymer;
a second bonding layer comprising the compatibilizer material and the bonding material; and
a sealant layer;
wherein the sealant layer is a first outer layer of the film, wherein the first polar polymer layer is a second outer layer of the film, wherein the first bonding layer is positioned between the first polar polymer layer and the second polar polymer layer, wherein the second bonding layer is positioned between the second polar polymer layer and the sealant layer, and wherein the film includes a Shrinkage Value of greater than 10% in each of the machine direction and the transverse direction when tested according to ASTM D2732-03 using a bath temperature of 90 degrees Celsius (° C.).

### Claim 14 (depends on 13)

The film of claim 13, wherein the first bonding layer comprises the compatibilizer material in an amount from 5% to 35% by weight of the polyamide in the first polar polymer layer.

### Claim 15 (depends on 13)

The film of claim 13, wherein the second bonding layer comprises the compatibilizer material in an amount from 5% to 35% by weight of the ethylene vinyl alcohol (EVOH) copolymer in the second polar polymer layer.

### Claim 16 (depends on 13)

A package comprising the film of claim 13.