# US 11,993,060 B2 · Multilayer film

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- Number: US 11,993,060 B2
- Document ID: US11993060B2
- Status: Granted
- Kind: B2
- Application number: 17/418,377
- Filed: 2019-12-23
- Published: 2022-03-03
- Granted: 2024-05-28
- Earliest claimed: 2018-12-28
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Tuan Anh Tran; Gerhard Schuster
- Web page: https://patentgrep.com/patent/US11993060B2

## CPC

- B32B 27/08: of synthetic resin
- B32B 1/00: Layered products having a non-planar shape
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)}
- C08J 5/18: Manufacture of films or sheets
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- B32B 2250/03: 3 layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/242: All polymers belonging to those covered by group B32B27/32
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/50: having particular mechanical properties
- B32B 2307/558: Impact strength, toughness
- B32B 2307/581: Resistant to cut
- B32B 2307/5825: Tear resistant
- B32B 2307/72: Density
- B32B 2307/732: Dimensional properties
- B32B 2439/06: Bags, sacks, sachets
- C08J 2323/08: Copolymers of ethene (C08J2323/16 takes precedence)
- C08J 2423/06: Polyethene
- C08J 2423/08: Copolymers of ethene (C08J2423/16 takes precedence)
- C08L 2203/16: used for films
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Multilayer film which comprises a core layer (C) and two outer layers (0-1, 0-2) sandwiching the core layer, wherein (i) the core layer (C) comprises 90 to 100% by weight of a first bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer having a density between >925 kg/m3 and 970 kg/m3 with respect to the total weight of the layer, (ii) two outer layers (0-1) and (0-2) comprise (ii-1) the bimodal terpolymer as defined for the core layer (C) and (ii-2) a second bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer having a density between >910 kg/m3 and <925 kg/m3.

## Claims

### Claim 1

A multilayer film comprising a core layer (C) and two outer layers (O-1, O-2) sandwiching the core layer, wherein
(i) the core layer (C) comprises from 90 to 100% by weight of a first bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer having a density between >925 kg/m3 and 970 kg/m3 with respect to the total weight of the layer,
(ii) the two outer layers (O-1) and (O-2) each comprise a blend of
(ii-1) the first bimodal terpolymer as defined for the core layer (C) and
(ii-2) a second bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer having a density between >910 kg/m3 and <925 kg/m3.

### Claim 2 (depends on 1)

The multilayer film according to claim 1, wherein the first bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer of the core layer comprises
(A-1) a low molecular weight homopolymer of ethylene and
(A-2) a high molecular weight terpolymer of ethylene, 1-butene, and a C6-C12-alpha-olefin.

### Claim 3 (depends on 2)

The multilayer film according to claim 2, wherein the first bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer comprises a low molecular weight fraction of a homopolymer of ethylene and a high molecular weight fraction of a terpolymer of ethylene, 1-butene, and a C6-C12-alpha-olefin,
wherein the first bimodal terpolymer has a melt flow rate MFR21 according to ISO 1133 (190° C.) of 10 to 40 g/10 min, a density according to ISO 1183, (method A) of 910 to 950 kg/m3, and a comonomer content of 1 to 7% by mol whereby
the low molecular weight fraction of the first bimodal terpolymer has a melt index MFR2 according to ISO 1133 (190° C.) of 200 to 800 g/10 min, a density according to ISO 1183, (method A) of 940 to 980 kg/m3, and a comonomer content of 0 to 2.5% by mol, and the amount of the low molecular weight fraction in the bimodal terpolymer is in the range of 30 to 60 wt %.

### Claim 4 (depends on 3)

The multilayer film according to claim 3, wherein the first bimodal terpolymer has a melt flow rate MFR21 according to ISO 1133 (190° C.) of 15 to 30 g/10 min and/or a density according to ISO 1183, (method A) of 925 to 937 kg/m3 and/or a comonomer content of 1.5 to 3.0% by mol.

### Claim 5 (depends on 3)

The multilayer according to claim 3, wherein the low molecular weight fraction of the first bimodal terpolymer has a melt index MFR2 according to ISO 1133 (190° C.) of 300 to 600 g/10 min and/or a density according to ISO 1183, (method A) of 945 to 975 kg/m3 and/or a comonomer content of 0 to 2% by mol and/or the amount of the low molecular weight fraction in the first bimodal terpolymer is in the range of 35 to 50 wt %.

### Claim 6 (depends on 1)

The multilayer film according to claim 1, wherein the C6-C12 alpha-olefins of the first and second bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer are selected from the group of 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene.

### Claim 7 (depends on 1)

The multilayer film according to claim 1, wherein the first bimodal terpolymer (ii-1) of the outer layers (O-1) and (O-2) has with an MFR2 according to ISO 1133 (190° C.) of 0.1 to 5 g/10 min.

### Claim 8 (depends on 7)

The multilayer according to claim 7, wherein the first bimodal terpolymer of the outer layers (O-1) and (O-2) has an MFR2 according to ISO 1133 (190° C.) of 0.2 to 3 g/10 min.

### Claim 9 (depends on 1)

The multilayer film according to claim 1, wherein the first bimodal terpolymer (ii-1) of the outer layers (O-1) and (O-2) has a density according to ISO 1183, (method A) of >925 to 970 kg/m3.

### Claim 10 (depends on 9)

The multilayer according to claim 9, wherein the first bimodal terpolymer of the outer layers (O-1) and (O-2) has a density according to ISO 1183, (method A) of 927 to 939 kg/m3.

### Claim 11 (depends on 1)

The multilayer film according to claim 1, wherein the second bimodal terpolymer (ii-2) of the outer layers (O-1) and (O-2) has an MFR2 according to ISO 1133 (190° C.) of 0.7 to 6 g/10 min.

### Claim 12 (depends on 11)

The multilayer according to claim 11, wherein the second bimodal terpolymer of the outer layers (O-1) and (O-2) has an MFR2 according to ISO 1133 (190° C.) of 1 to 3 g/10 min.

### Claim 13 (depends on 1)

The multilayer film according to claim 1, the second bimodal terpolymer (ii-2) of the outer layer (O-1) and (O-2) has a density according to ISO 1183, (method A) of 921 to 923 kg/m3.

### Claim 14 (depends on 13)

The multilayer according claim 13, wherein the second bimodal terpolymer of the outer layers (O-1) and (O-2) has a density according to ISO 1183, (method A) of 915 to 922 kg/m3.

### Claim 15 (depends on 1)

The multilayer film according to claim 1, wherein each blend of the outer layers (O-1) and (O-2) comprise 1 to 50 wt % of the first bimodal terpolymer and >50 to 99 wt % of the second bimodal terpolymer.

### Claim 16 (depends on 15)

The multilayer according to claim 15, wherein each blend of the outer layers (O-1) and (O-2) comprises 20 to 40 wt % of the first bimodal terpolymer and 60 to 80 wt % of the second bimodal terpolymer.

### Claim 17 (depends on 1)

The multilayer film according to claim 1, wherein the outer layers (O-1) and (O-2) may be the same.

### Claim 18 (depends on 1)

The multilayer film according to claim 1, having a thickness of to 250 microns whereby the outer layers and core layer may all be of equal thickness or alternatively each outer layer forms 10 to 35% of the total thickness of the multilayered film and the core layer forms 30 to 80% of the total thickness of the multilayered film.

### Claim 19 (depends on 18)

The multilayer according to claim 18, having a thickness of 20 to 200 microns and/or each outer layer forms 15 to 30% of the total thickness of the multilayered film and/or the core layer forms 40 to 70% of the total thickness of the multilayered film.

### Claim 20 (depends on 1)

A heavy duty shipping sack and/or or form-fill-seal bag comprising the multilayer film of claim 1.