# US 8,541,073 B2 · Composition comprising ethylene copolymers and polyolefin

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- Number: US 8,541,073 B2
- Document ID: US8541073B2
- Status: Granted
- Kind: B2
- Application number: 13/311,103
- Filed: 2011-12-05
- Published: 2012-03-29
- Granted: 2013-09-24
- Earliest claimed: 2004-01-08
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: Terrance D. Kendig; Stephen Robert Tanny
- Inventors: Terrance D. Kendig; Stephen Robert Tanny
- Web page: https://patentgrep.com/patent/US8541073B2

## CPC

- B32B 27/08: of synthetic resin
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- C09J 123/0869: {Acids or derivatives thereof}
- B32B 2307/31: Heat sealable
- B32B 2307/748: Releasability
- B32B 2439/00: Containers; Receptacles
- B32B 2439/70: Food packaging
- B32B 2439/80: Medical packaging
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2666/02: Organic macromolecular compounds, natural resins, waxes or and bituminous materials
- C08L 2666/06: Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1476: Release layer
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed are compositions of ethylene/(meth)acrylate copolymers, polyolefins (e.g., polyethylene and polypropylene), optional tackifier resins and optional fillers that provide very strong, tight hermetic heat seals yet are easily peelable. These compositions are useful as an adhesive layer in multilayer structures that are useful as packaging lidding films. Also disclosed are packages that comprise these multilayer structures.

## Claims

### Claim 1

A multilayer structure comprising at least one adhesive layer produced from a composition, at least one second layer, and at least one third layer wherein
the adhesive layer forms a peelable seal characterized by interfacial peel failure to the third layer;
the composition consists essentially of (a) from about 10 to about 80 weight % of a combination of an ethylene/alkyl acrylate copolymer and an ionomer of either ethylene/acrylic acid copolymer or ethylene/methacrylic acid copolymer; (b) from about 5 to about 60 weight % of a polyolefin consisting essentially of high density polyethylene, linear low density polyethylene, very low density polyethylene, ultra low density polyethylene, low density polyethylene, or combinations of two or more thereof; (c) from 0 to about 35 weight % of at least one tackifying resin; and (d) from 0 to about 35 weight % of filler;
the second layer comprises or is produced from foil, paper, polyester, polyamide, polyolefin, polyethylene vinyl alcohol, polyethylene vinyl acetate, ethylene/(meth)acrylic acid copolymer, ionomer of ethylene/(meth)acrylic acid copolymer, polyvinyl chloride, polyvinylidene chloride, or anhydride-modified polyolefin; and
the third layer comprises or is produced from polypropylene, polystyrene or high-impact polystyrene, expanded polystyrene, acrylic homopolymer, acrylic copolymer, polycarbonate, polysulfone, amorphous polyethylene terephthalate, crystalline polyethylene terephthalate, PVC, polychlorotrifluoroethylene, polyacrylonitrile homopolymer, polyacrylonitrile copolymer, polyacetal, or polyacetal copolymer.

### Claim 2 (depends on 1)

The multilayer structure of claim 1 wherein the adhesive layer provides a heat sealable film layer and with the second layer comprises a lidding material for a container comprising the third layer.

### Claim 3 (depends on 1)

The multilayer structure of claim 1 wherein the third layer comprises polypropylene, polystyrene, high-impact polystyrene, amorphous polyethylene terephthalate, crystalline polyethylene terephthalate or PVC.

### Claim 4 (depends on 3)

The multilayer structure of claim 3 wherein the third layer comprises polypropylene, polystyrene, high-impact polystyrene or PVC.

### Claim 5 (depends on 1)

A package or container comprising or produced from a multilayer structure as recited in claim 1.

### Claim 6 (depends on 5)

The package or container of claim 5 wherein the third layer comprises polypropylene, polystyrene, high-impact polystyrene, amorphous polyethylene terephthalate, crystalline polyethylene terephthalate, or PVC.

### Claim 7 (depends on 6)

The package or container of claim 6 being a blister package, a pouch, a molded, a pressed or thermoformed container and the third layer comprises polypropylene, polystyrene, high-impact polystyrene, or PVC.