# US 10,307,999 B2 · Multilayer films and methods of making the same

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- Number: US 10,307,999 B2
- Document ID: US10307999B2
- Status: Granted
- Kind: B2
- Application number: 15/126,373
- Filed: 2014-04-14
- Published: 2017-05-18
- Granted: 2019-06-04
- Earliest claimed: 2014-04-14
- Assignees: ExxonMobil Chemical Patents Inc.
- Applicants: ExxonMobil Chemical Patents Inc.
- Inventors: Zhen-Yu Zhu; Zhi-Yi Shen
- Web page: https://patentgrep.com/patent/US10307999B2

## CPC

- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B29C 48/0018: {combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence)}
- B29C 48/10: flexible, e.g. blown foils
- B29C 48/21: the layers being joined at their surfaces
- B29C 48/625: characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
- B29C 48/832: {Heating}
- B29C 48/834: {Cooling}
- B29C 48/885: External treatment, e.g. by using air rings for cooling tubular films
- B29C 48/912: {of tubular films}
- B32B 27/08: of synthetic resin
- B32B 27/327: {comprising polyolefins obtained by a metallocene or single-site catalyst}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 37/14: characterised by the properties of the layers
- B29C 2948/926: Flow or feed rate
- B29C 2948/92704: Temperature
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/518: bi-axially
- B32B 2307/72: Density
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)

## Abstract

Disclosed are multilayer films which can provide desired low-temperature bag drop performance suited for laminate freezer film packaging.

## Claims

### Claim 1

A multilayer film, comprising two outer layers and a core layer between the two outer layers, wherein each of the two outer layers comprise from about 60 wt % to about 80 wt % of a first polyethylene and from about 40 wt % to about 20 wt % of a second polyethylene, based on the total weight of each outer layer, and the core layer comprises from about 40 wt % to about 60 wt % of a first polyethylene and from about 60 wt % to about 40 wt % of a third polyethylene, based on the weight of the core layer, wherein:
(i) the first polyethylene is derived from ethylene and one or more C3 to C20 α-olefin comonomers, and is a metallocene polyethylene (mPE) having a density of about 0.910 to about 0.940 g/cm3, a melt index (MI), I2.16, of about 0.1 to about 15, a molecular weight distribution (MWD) of about 1.5 to about 5.5, and a melt index ratio (MIR), I21.6/I2.16, of about 10 to about 25;
(ii) the second polyethylene is derived from ethylene and one or more C3 to C20 α-olefin comonomers, and has a density of about 0.915 to about 0.940 g/cm3, an MI, I2.16, of about 0.1 to about 5, an MWD of about 2.5 to about 5.5, and an MIR, I21.6/I2.16, of greater than 25 to about 100; and
(iii) the third polyethylene has a density of about 0.940 g/cm3 to about 0.965 g/cm3;
wherein the multilayer film has at least one of the following properties: (i) a non-breakage rate (EMC method) of about 60% to about 100% when laminated to a polyester substrate film; and (ii) a non-breakage rate (EMC method) of about 60% to about 100% when laminated to a polyethylene substrate film.

### Claim 2 (depends on 1)

The multilayer film of claim 1, wherein the multilayer film has at least one of the following properties: (i) a non-breakage rate (EMC method) of about 100% when laminated to a polyester substrate film; and (ii) a non-breakage rate (EMC method) of about 100% when laminated to a polyethylene substrate film.

### Claim 3 (depends on 1)

The multilayer film of claim 1, further comprising a substrate film comprising:
(a) two substrate outer layers and a substrate core layer between the two substrate outer layers, wherein each of the two substrate outer layers and the substrate core layer comprises a polyethylene derived from ethylene and one or more C3 to C20 α-olefin comonomers, wherein the polyethylene has a density of about 0.910 to about 0.940 g/cm3, an MI, I2.16, of about 0.1 to about 15, an MWD of about 1.5 to about 5.5, and an MIR, I21.6/I2.16, of about 10 to about 50; and
(b) two substrate inner layers, each having a density of at least about 0.003 g/cm3 higher than that of the outer layer on the same side of the core layer, wherein each substrate inner layer is between the substrate core layer and each substrate outer layer.

### Claim 4 (depends on 3)

The multilayer film of claim 3, wherein the two substrate outer layers each further comprises a polyethylene derived from ethylene and one or more C3 to C20 α-olefin comonomers, wherein the polyethylene has a density of about 0.910 to about 0.945 g/cm3, an MI, I2.16, of about 0.1 to about 15, an MWD of about 2.5 to about 5.5, and an MIR, I21.6/I2.16, of about 25 to about 100.

### Claim 5 (depends on 1)

The multilayer film of claim 1, further comprising a substrate film comprising at least one of biaxially oriented polyester, biaxially oriented polypropylene, and biaxially oriented polyamide.

### Claim 6 (depends on 1)

The multilayer film of claim 1, wherein the two outer layers are identical.

### Claim 7 (depends on 1)

The multilayer film of claim 1, wherein the volume ratio between one of the outer layers and the core layer is about 1:1 to about 1:4.

### Claim 8 (depends on 1)

A package comprising the multilayer film of claim 1.