# US 6,294,609 B1 · Composition based on an ethylene-vinyl alcohol copolymer and its use

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- Number: US 6,294,609 B1
- Document ID: US6294609B1
- Status: Granted
- Kind: B1
- Application number: 09/487,203
- Filed: 2000-01-19
- Granted: 2001-09-25
- Earliest claimed: 1999-01-19
- Assignees: Atofina
- Inventors: Denis Bertin; Denis Germain
- Web page: https://patentgrep.com/patent/US6294609B1

## CPC

- B32B 27/08: of synthetic resin
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- B32B 2323/046: LDPE, i.e. low density polyethylene
- B32B 2439/60: Bottles
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Particularly useful as a barrier layer in packaging, e.g. multilayer structures, is a composition based on an ethylene-vinyl alcohol copolymer comprising: 50 to 98% by weight of an EVOH copolymer 1 to 50% by weight of a polyethylene (A) 1 to 15% by weight of a polyethylene (B) being a blend of a polyethylene (B1) and a polyethylene (B2) chosen from elastomers, very-low-density polyethylenes and metallocene polyethylenes, the blend of (B1) and (B2) being cografted by an unsaturated carboxylic acid or a functional acid derivative thereof.

## Claims

### Claim 1

A composition based on an ethylene-vinyl alcohol (EVOH) copolymer comprising:
50 to 98% by weight of an EVOH copolymer
1 to 50% by weight of a polyethylene (A)
1 to 15% by weight of an acid grafted blend (B) of a polyethylene (B1) and a polyethylene (B2) chosen from elastomers, very-low-density polyethylenes and metallocene polyethylenes, the blend of (B1) and (B2) being cografted by an unsaturated carboxylic acid or a functional acid derivative thereof, (B1) and (B2) being different polyethylenes.

### Claim 2 (depends on 1)

A composition according to claim 1, in which polyethylene (A) is an LLDPE or a metallocene polyethylene.

### Claim 3 (depends on 1)

A composition according to claim 1, in which (B1) is chosen from LLDPEs and metallocene polyethylenes.

### Claim 4 (depends on 1)

A multilayer structure comprising a layer of the composition according to claim 1.

### Claim 5 (depends on 4)

Packaging, bottles or containers comprising the multilayer structure of claim 4.

### Claim 6 (depends on 1)

A composition according to claim 1, wherein:
(B1) has a relative density of 0.870 to 0.900 and
(B2) has a relative density of between 0.860 and 0.880, and lower than the relative density of (B1).

### Claim 7 (depends on 1)

A composition according to claim 1, wherein:
(B) has an ethylene content of not less than 70%;
(B1) comprises at least 75 mol % of ethylene and has an MFI2/[η]−8.77 ratio in absolute value greater than 15; and
(B2) comprises at least 50 mol % of ethylene; and
an MFI2/[η]−8.77 ratio in absolute value greater than 15, [η] denoting the intrinsic viscosity (dl/g) of a polymer measured in a decalin solution at 135° C.

### Claim 8 (depends on 7)

A composition according to claim 7, in which (B) is such that the MFI10/MFI2 ratio is between 5 and 20, where MFI2 is the melt flow index at 190° C. under a load of 2.16 kg, measured according to ASTM D1238, and MFI10 is the melt flow index at 190° C. under a load of 10 kg according to ASTM D1238.