# US 2021/0276311 A1 · Extrusion coated can liner film

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- Number: US 2021/0276311 A1
- Document ID: US20210276311A1
- Status: Published application
- Kind: A1
- Application number: 16/805,685
- Filed: 2020-02-28
- Published: 2021-09-09
- Earliest claimed: 2020-02-28
- Applicants: Toray Plastics (America), Inc.
- Inventors: Jan MORTIZ; Robert ERVOLINO; Gerado RADA
- Web page: https://patentgrep.com/patent/US20210276311A1

## CPC

- B32B 27/08: of synthetic resin
- B65D 1/165: {Cylindrical cans}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/09: comprising polyesters
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- 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)}
- B32B 2250/03: 3 layers
- B32B 2255/06: on metal layer
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/205: Metallic coating
- B32B 2255/26: Polymeric coating
- B32B 2264/102: Oxide or hydroxide
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/732: Dimensional properties
- B32B 2439/66: Cans, tins
- B32B 2439/70: Food packaging
- 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

## Abstract

Embodiments relate to a multilayer film for food packaging applications, the multilayer film having chemical resistance to products having low to high pH from about 1 pH to about 13 pH, the multilayer film comprising a base layer and a top layer; wherein the base layer comprises polyethylene terephthalate, and optionally polybutylene terephthalate; and the top layer comprises low density polyethylene; wherein the multilayer film optionally has a thickness of 80 G (20 μm) or less.

## Claims

### Claim 1

A can liner comprising a laminated metal sheet comprising a tin-free metal sheet and a multilayer film comprising a base layer and a top layer; wherein the base layer comprises 60-99.99 wt % of polyethylene terephthalate, 20-40 wt % of polybutylene terephthalate and 0.01-1 wt % silica; and the top layer comprises 90-100 wt % low density polyethylene having a thickness of about 6 μm or less; wherein the multilayer film has a thickness of 80 G (20 μm) or less.

### Claim 2 (depends on 1)

The can liner of claim 1, wherein the multilayer film has the thickness of about 60 G (15 μm) or less.

### Claim 3 (depends on 2)

The can liner of claim 2, wherein the top layer has a melt index of about 10 gm/10 min or less.

### Claim 4 (depends on 1)

The can liner of claim 1, further comprising a primer layer between the base layer and the top layer, wherein the primer layer comprises polyethylenimine.

### Claim 5

(canceled)

### Claim 6

(canceled)

### Claim 7

A can liner comprising a laminated metal sheet comprising a tin-free metal sheet and a multilayer film comprising a base layer, a primer layer and a top layer in this order; wherein the base layer comprises 90-99.99 wt % of polyethylene terephthalate and 0.01-1 wt % silica; the primer layer comprises polyethylenimine; and the top layer comprises 90-100 wt % low density polyethylene having a thickness of about 6 μm or less, wherein the multilayer film has a thickness of 80 G (20 μm) or less.

### Claim 8 (depends on 7)

The can liner of claim 7, wherein the multilayer film has the thickness of about 60 G (15 μm) or less.

### Claim 9 (depends on 8)

The can liner of claim 8, wherein the top layer has a melt index of about 10 gm/10 min or less.

### Claim 10 (depends on 9)

The can liner of claim 9, wherein the top layer has the melt index of about 9 gm/10 min or less.

### Claim 11 (depends on 10)

The can liner of claim 10, wherein the top layer has the melt index of about 8 gm/10 min or less.

### Claim 12

A can liner comprising a laminated metal sheet comprising a tin-free metal sheet and a multilayer film comprising a base layer, a primer layer and a top layer in this order; wherein the base layer comprises 60-99.99 wt % of polyethylene terephthalate, 20-40 wt % of polybutylene terephthalate and 0.01-1 wt % silica; the primer layer comprises polyethylenimine; and the top layer comprises 90-100 wt % low density polyethylene having a thickness of about 6 μm or less.

### Claim 13 (depends on 12)

The can liner of claim 12, wherein the multilayer film has a thickness of 80 G (20 μm) or less.

### Claim 14 (depends on 13)

The can liner of claim 13, wherein the multilayer film has the thickness of about 60 G (15 μm) or less.

### Claim 15

A can liner comprising a laminated metal sheet comprising a tin-free metal sheet and a multilayer film comprising a base layer, an intermediate layer and a top layer in this order; wherein the base layer comprises 90-99.99 wt % of polyethylene terephthalate and 0.01-1 wt % silica; the intermediate layer comprises 90-100 wt % of isophthalic acid modified polyethylene terephthalate; and the top layer comprises 90-100 wt % low density polyethylene having a thickness of about 6 μm or less.

### Claim 16 (depends on 15)

The can liner of claim 15, wherein the multilayer film has a thickness of 80 G (20 μm) or less.

### Claim 17 (depends on 15)

The can liner of claim 15, further comprising a primer layer between the intermediate layer and the top layer, wherein the primer layer comprises polyethylenimine.

### Claim 18

A can liner comprising a laminated metal sheet comprising a tin-free metal sheet and a multilayer film comprising a base layer, an intermediate layer, a primer layer and a top layer in this order; wherein the base layer comprises 90-99.99 wt % of polyethylene terephthalate and 0.01-1 wt % silica; the intermediate layer comprises 40-60 wt % of polyethylene terephthalate and 40-60 wt % of amorphous copolyester; the primer layer comprises polyethylenimine; and the top layer comprises 90-100 wt % low density polyethylene having a thickness of about 6 μm or less.

### Claim 19 (depends on 18)

The can liner of claim 18, wherein the multilayer film has a thickness of 80 G (20 μm) or less.

### Claim 20 (depends on 19)

The can liner of claim 19, wherein the multilayer film has the thickness of about 60 G (15 μm) or less.

### Claim 21 (depends on 7)

The can liner of claim 7, wherein the top layer has a melt index of about 10 gm/10 min or less and the low density polyethylene has a thickness of about 4-6 μm.

### Claim 22 (depends on 12)

The can liner of claim 12, wherein the top layer has a melt index of about 10 gm/10 min or less and the low density polyethylene has a thickness of about 4-6 μm.