Multi-layer film

Patent metadata

Field	Value
Publication number	US-10696014-B2
Application number	US-201716461439-A
Country	US
Kind code	B2
Filing date	Dec 21, 2017
Priority date	Dec 21, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

The present invention concerns a multi-layer film comprising at least five layers, with two outer layers, two intermediate layers and one core layer, wherein the core layer comprises an ethylene copolymer having a density between ≥0.910 g/cm3 and 0.925 g/cm3, the intermediate layers comprise an ethylene copolymer comprising 1-octene and having a density between >0.915 g/cm3 and 0.925 g/cm3, wherein further the first outer layer comprises between 65 wt. % and 93 wt. % of a first ethylene copolymer comprising 1-octene and having a density between >0.915 g/cm3 and 0.925 g/cm3 and between 7 wt. % and 35 wt. % of a second ethylene copolymer having a density between >0.925 g/cm3 and 0.945 g/cm3 based on the total weight of polymers of the layer, wherein further the second outer layer comprises between 35 wt. % and 65 wt. % of a first ethylene copolymer comprising 1-octene and having a density between >0.915 g/cm3 and 0.925 g/cm3 and between 35 wt. % and 65 wt. % of a second ethylene copolymer having a density between 0.850 g/cm3 and <0.915 g/cm3 based on the total weight of the polymers of the layer.

First claim

The invention claimed is:

1. Multi-layer film comprising at least five layers, with two outer layers, two intermediate layers and one core layer, wherein the core layer comprises an ethylene copolymer having a density between ≥0.910 g/cm 3 and 0.925 g/cm 3 ,
wherein the ethylene copolymer of the core layer comprises 1-hexene or 1-octene,
wherein the intermediate layers comprise an ethylene copolymer comprising 1-octene and having a density between ≥0.910 g/cm 3 and 0.925 g/cm 3 ,
wherein the first outer layer comprises either
a polyethylene with a density between 0.915 g/cm 3 and 0.935 g/cm 3 , or
between 65 wt. % and 93 wt. % of a first ethylene copolymer comprising 1-octene and having a density between >0.915 g/cm 3 and 0.925 g/cm 3 and between 7 wt. % and 35 wt. % of a second ethylene copolymer having a density between >0.925 g/cm 3 and 0.945 g/cm 3 , based on the total weight of polymers of the first outer layer,

wherein the second outer layer comprises between 35 wt. % and 65 wt. % of a first ethylene copolymer comprising 1-octene and having a density between ≥0.910 g/cm 3 and between 35 wt. % and 65 wt. % of a second ethylene copolymer having a density between 0.850 g/cm 3 and <0.915 g/cm 3 , based on the total weight of the polymers of the second outer layer, and
wherein each of the five layers comprises only polyolefins as polymers.

2. The multi-layer film according to claim 1 , wherein the first outer layer comprises between 70 wt. % and <93 wt. % of the first ethylene copolymer comprising 1-octene and between >7 wt. % and 30 wt. % of the second ethylene copolymer based on the total weight of polymers of the first outer layer, and/or
wherein the second outer layer comprises between 40 wt. % and 60 wt. % of the first ethylene copolymer comprising 1-octene and between 40 wt. % and 60 wt. % of the second ethylene copolymer based on the total weight of the polymers of the second outer layer, and/or
wherein the core layer comprises between 90 wt. % and 100 wt. % of the ethylene copolymer based on the total weight of the polymers of the core layer, and/or
wherein each intermediate layer comprises between 90 wt. % and 100 wt. % of the ethylene copolymer based on the total weight of the polymers of the intermediate layer.

3. The multi-layer film according to claim 1 ,
wherein the multi-layer film consists of five layers, and/or
wherein the first outer layer and the second outer layer comprise the same first ethylene copolymer, and/or
wherein the melt flow rate of the ethylene copolymer of the core layer is lower than the melt flow rate of the ethylene copolymer(s) of each of the intermediate layers, and/or
wherein the multi-layer film comprises no polypropylene, and/or
wherein the five layers are adjacent to each other.

4. The multi-layer film according to claim 1 , wherein the second ethylene copolymer of the first outer layer comprises 1-hexene or 1-octene.

5. The multi-layer film according to claim 1 , wherein the second ethylene copolymer of the second outer layer comprises 1-hexene or 1-octene.

6. The multi-layer film according to claim 1 , wherein
the density of the ethylene copolymer of the core layer is between 0.913 and 0.923 g/cm 3 , and/or
the melt flow rate of the ethylene copolymer of the core layer is between 0.2 and 2.5 g/10min.

7. The multi-layer film according to claim 1 , wherein
the density of the ethylene copolymer of the intermediate layer is between 916 g/cm 3 and 0.923 g/cm 3 , and/or
the melt flow rate of the ethylene copolymer of the intermediate layer is between 0 .2 and 2.5 g/10 min.

8. The multi-layer film according to claim 1 , wherein
the density of the first ethylene copolymer of the first outer layer is between 916 g/cm 3 and 0.923 g/cm 3 , and/or
the melt flow rate of the ethylene copolymer of the intermediate layer is between 0.2 and 2.5 g/10 min.

9. The multi-layer film according to claim 1 , wherein
the density of the first ethylene copolymer of the second outer layer is between 916 g/cm 3 and 0.923 g/cm 3 , and/or
the melt flow rate of the first ethylene copolymer of the second outer layer is between 1 and 4 g/10 min.

10. The multi-layer film according to claim 1 , wherein
the density of the second ethylene copolymer of the first outer layer is between 0.930 g/cm 3 and 0.940 g/cm 3 , and/or
the melt flow rate of the second ethylene copolymer of the first outer layer is between 1 and 4 g/10 min.

11. The multi-layer film according to claim 1 , wherein
the density of the second ethylene copolymer of the second outer layer is between 0.855 g/cm 3 and 0.910 g/cm 3 , and/or
the melt flow rate of the second ethylene copolymer of the second outer layer is between 0.2 and 2.5 g/10 min.

12. The multi-layer film according to claim 1 , wherein
the thickness of each outer layer represents between 10% and 20% of a total film thickness, and/or
the thickness of each intermediate layer represents between 15% and 25% of the total film thickness, and/or
the thickness of the core layer represents between 25% and 35% of the total film thickness.

13. Silage comprising the multi-layer film according to claim 1 .

14. The multi-layer film of claim 1 , comprising at least five layers,
wherein the density of the intermediate layers between >0.915 g/cm 3 and 0.925 g/cm 3 ,
wherein the polyethylene of the first outer layer is a low density polyethylene with a density between 0.915 g/cm 3 and 0.935 g/cm 3 ,
wherein the first ethylene copolymer of the second outer layer has a density between > 0 .915 g/cm 3 and 0.925 g/cm 3 , and
wherein the multi-layer film comprises only polyolefins as polymers.

15. The multi-layer film of claim 1 , comprising at least five layers,
wherein the density of the intermediate layers between >0.915 g/cm 3 and 0.925 g/cm 3 ,
wherein the first outer layer comprises between 65 wt. % and 93 wt. % of a first ethylene copolymer comprising 1-octene and having a density between >0.915 g/cm 3 and 0.925 g/cm 3 and between 7 wt. % and 35 wt. % of a second ethylene copolymer having a density between >0.925 g/cm 3 and 0.945 g/cm 3 , based on the total weight of polymers of the first outer layer, and
wherein the multi-layer film comprises only polyolefins as polymers.

16. Multi-layer film according to claim 1 , wherein the melt flow rate of the ethylene copolymer of the core layer is lower than the melt flow rate of the ethylene copolymer(s) of each of the intermediate layers.

17. The multi-layer film according to claim 1 , wherein the multi-layer film comprises no polypropylene.

18. The multi-layer film according to claim 1 ,
wherein the density of the ethylene copolymer of the core layer is between >0.915 and <0.923 g/cm 3 , and the melt flow rate of the ethylene copolymer of the core layer is between 0.5 and 1.5 g/10 min,
wherein the density of the ethylene copolymer of the intermediate layer is between >0.916 g/cm 3 and <0.923 g/cm 3 , and the melt flow rate of the ethylene copolymer of the intermediate layer is between 0.5 and 1.5 g/10 min,
wherein the density of the first ethylene copolymer of the first outer layer is between >0.916 g/cm 3 and <0.923 g/cm 3 , and the melt flow rate of the ethylene copolymer of the intermediate layer is 0.5 and 1.5 g/10 min,
wherein the density of the second ethylene copolymer of the first outer layer is between >0.930 g/cm 3 and <0.940 g/cm 3 , and the melt flow rate of the second ethylene copolymer of the first outer layer is between 2.4 and <3.5 g/10 min,
wherein the density of the first ethylene copoly

Assignees

• Sabic Global Technologies Bv

Inventors

• Baccaro Lucio
• Scala Attilio

Classifications

• B32B7/02

  Physical, chemical or physicochemical properties · CPC title

• B29C48/21

  the layers being joined at their surfaces · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B7/022 Primary

  Mechanical properties · CPC title

• B32B27/32 Primary

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title