# US 2014/0004336 A1 · Polyolefin laminate film for cardboard lamination

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- Number: US 2014/0004336 A1
- Document ID: US20140004336A1
- Status: Published application
- Kind: A1
- Application number: 13/535,233
- Filed: 2012-06-27
- Published: 2014-01-02
- Earliest claimed: 2012-06-27
- Assignees: Toray Plastics (America), Inc.
- Inventors: Shichen DOU; Scott NARKEVICIUS; John J. FITCH
- Web page: https://patentgrep.com/patent/US20140004336A1

## CPC

- B32B 37/12: characterised by using adhesives
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/10: of paper or cardboard
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/18: characterised by the use of special additives
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 37/153: {at least one layer is extruded and immediately laminated while in semi-molten state}
- B32B 2037/1215: {Hot-melt adhesive}
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/518: bi-axially
- B32B 2307/7246: Water vapor barrier
- B32B 2307/7265: Non-permeable
- B32B 2307/746: Slipping, anti-blocking, low friction
- B32B 2317/12: Paper, e.g. cardboard
- B32B 2323/00: Polyalkenes
- B32B 2439/62: Boxes, cartons, cases
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/254: Polymeric or resinous material
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- Y10T 428/31663: As siloxane, silicone or silane
- Y10T 428/31797: Next to addition polymer from unsaturated monomers
- Y10T 428/31913: Monoolefin polymer
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Described are polyolefin laminate films including a core layer, a first outer layer on one side including a blend of 5-20 wt % modified polar polyolefin, 5-20 wt % ethylene-propylene copolymer and 80-90 wt % mini-random polypropylene, and an optional second outer layer on the other side of said core layer opposite the first outer layer, including mini-random polypropylene or copolymers or combinations thereof. The laminate film is suitable for hot melt adhesive lamination with paper or cardboard to package a product.

## Claims

### Claim 1

A laminate film structure comprising:
a core layer comprises at least 50 wt % polyolefin;
a first outer layer comprising a blend of a modified polar polyolefin and ethylene-propylene copolymer or mini-random polypropylene;
a cardboard or paper layer; and
a hot melt adhesive layer to adhere the first outer layer to the cardboard or paper layer.

### Claim 2 (depends on 1)

The laminate film structure of claim 1, further comprising a second outer layer comprising mini-random polypropylene and ethylene-propylene copolymer.

### Claim 3 (depends on 1)

The laminate structure of claim 1, wherein the modified polar polyolefin is maleic anhydride grafted polyolefins.

### Claim 4 (depends on 1)

The laminate film structure of claim 1, wherein the modified polar polyolefin is an ethylene copolymerized polar polymer.

### Claim 5 (depends on 1)

The laminate film structure of claim 1, wherein the first outer layer comprises modified polar polyolefin, ethylene-propylene copolymer, and mini-random polypropylene.

### Claim 6 (depends on 1)

The laminate film structure of claim 1, wherein the first outer layer comprises an ethylene-propylene copolymer with an ethylene content of from of 0.5 wt % to 15 wt %.

### Claim 7 (depends on 1)

The laminate film structure of claim 1, wherein the first outer layer comprises a mini-random polypropylene with an ethylene content of 1.0 wt % or less.

### Claim 8 (depends on 1)

The laminate film structure of claim 1, wherein the first out layer comprises an anti-blocking agent and a processing aid.

### Claim 9 (depends on 8)

The laminate film structure of claim 8, wherein the anti-blocking agent is selected from silicas, SiO2, CaO3, sodium calcium aluminosilicates, cross-linked silicone polymers, cyclic olefin copolymer, polymethylmethacrylate (PMMA) spheres, and ultra-high molecular weight polydimethyl siloxane (PDMS).

### Claim 10 (depends on 8)

The laminate film structure of claim 8, wherein the anti-blocking agent comprises 0.03 wt % to 5 wt % of the first outer layer.

### Claim 11 (depends on 8)

The laminate film structure of claim 8, wherein the anti-blocking agent has a mean particle size of 2 to 6 μm.

### Claim 12 (depends on 8)

The laminate film structure of claim 8, wherein the processing aid is a fluoropolymer.

### Claim 13 (depends on 8)

The laminate film structure of claim 8, wherein the active content of processing aid is less than 1000 ppm.

### Claim 14 (depends on 2)

The laminate film structure of claim 2, wherein the first out layer and the second outer layer comprise an anti-blocking agent and a processing aid.

### Claim 15 (depends on 1)

The laminate film structure of claim 1, wherein the core layer comprises 80 wt % to 100 wt % propylene homopolymer and 20 wt % or less of a modifier.

### Claim 16 (depends on 15)

The laminate film structure of claim 15, wherein the core layer comprises a hydrocarbon resin, a copolymer or a terpolymer modifier.

### Claim 17 (depends on 1)

The laminate film structure of claim 1, wherein the first outer layer is discharged treated.

### Claim 18

A laminate film structure comprising:
a core layer comprises at least 50 wt % polyolefin;
a first outer layer comprising maleic anhydride-grafted polyolefins, ethylene copolymerized polar polymers, ethylene-propylene copolymers and mini-random polypropylene;
a cardboard or paper layer; and
a hot melt adhesive layer to adhere the first outer layer to the cardboard or paper layer.

### Claim 19 (depends on 18)

The laminate film structure of claim 18, wherein the first outer layer comprises 1 wt % to 95 wt % maleic anhydride grafted polyolefins.

### Claim 20 (depends on 18)

The laminate film structure of claim 18, wherein the first outer layer comprises 1 wt % to 20 wt % ethylene copolymerized polar polymers.

### Claim 21 (depends on 18)

The laminate film structure of claim 18, wherein the first outer layer comprises 5 wt % to 30 wt % ethylene-propylene copolymers.

### Claim 22 (depends on 18)

The laminate film structure of claim 18, wherein the first outer layer comprises 1 wt % to 85 wt % mini-random polypropylene.

### Claim 23 (depends on 18)

The laminate film structure of claim 18, wherein the maleic anhydride-grafted polyolefins are homopolymers, copolymers and terpolymers comprising monomers of propylene, ethylene, and butylene.

### Claim 24 (depends on 18)

The laminate film structure of claim 18, wherein the maleic anhydride-grafted polyolefins are produce by grafting a maximum of 1.0 wt % of maleic anhydride onto polyolefins.

### Claim 25 (depends on 18)

The laminate film structure of claim 18, wherein the ethylene copolymerized polar polymers are copolymers or terpolymers comprising ethylene and at least one polar co-monomer.

### Claim 26 (depends on 18)

The laminate film structure of claim 18, wherein the ethylene content of the ethylene copolymerized polar polymers is from 80 wt % to 95 wt %.

### Claim 27 (depends on 18)

The laminate film structure of claim 18, wherein the ethylene copolymerized polar polymers comprise maleic anhydride, carboxylic acids, esters of maleic anhydride or carboxylic acids.

### Claim 28 (depends on 18)

The laminate film structure of claim 18, wherein the ethylene copolymerized polar polymers comprise maleic anhydride and at least one other polar co-monomer.

### Claim 29 (depends on 28)

The laminate film structure of claim 28, wherein a total polar co-monomer content in the ethylene copolymerized polar polymers is 5 wt % to 30 wt %.

### Claim 30 (depends on 18)

The laminate film structure of claim 18, wherein the first outer layer comprises an ethylene-propylene copolymer with an ethylene content of from of 0.5 wt % to 15 wt %.

### Claim 31 (depends on 18)

The laminate film structure of claim 18, wherein the first outer layer comprises a mini-random polypropylene with an ethylene content of 1.0 wt % or less.

### Claim 32 (depends on 18)

The laminate film structure of claim 18, wherein the first out layer comprises an anti-blocking agent and a processing aid.

### Claim 33

A method of making a laminate film structure comprising:
co-extruding a film comprising a core layer comprises at least 50 wt % polyolefin and a first outer layer comprising a blend of a modified polar polyolefin and ethylene-propylene copolymer or mini-random polypropylene; and
bonding a cardboard or paper layer to the film using a hot melt adhesive.

### Claim 34 (depends on 33)

The method of claim 33, wherein the film is biaxially oriented.

### Claim 35 (depends on 33)

The method of claim 33, further comprising co-extruding a second outer layer comprising mini-random polypropylene and ethylene-propylene copolymer with the core layer and the first skin layer.