# US 12,759,262 B2 · BOPP film and method of making the same

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- Number: US 12,759,262 B2
- Document ID: US12759262B2
- Status: Granted
- Kind: B2
- Application number: 18/075,017
- Filed: 2022-12-05
- Published: 2023-06-08
- Granted: 2026-10-13
- Earliest claimed: 2021-12-03
- Assignees: Inteplast Group Corporation
- Applicants: Inteplast Group Corporation
- Inventors: Rafael E. Bayona P.; Kiran Jayantilal Soneji
- Web page: https://patentgrep.com/patent/US12759262B2

## CPC

- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 5/32: {at least two} layers being foamed {and next to each other}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/065: {of foam}
- B32B 27/08: of synthetic resin
- 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 2250/05: 5 or more layers
- B32B 2264/0285: PET or PBT
- B32B 2264/1054: Alkaline earth metal
- B32B 2264/1059: Zinc
- B32B 2307/406: Bright, glossy, shiny surface
- B32B 2307/41: Opaque
- B32B 2307/518: bi-axially
- B32B 2307/732: Dimensional properties
- B32B 2519/00: Labels, badges
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

Multi-layer films and labels are disclosed herein. In an embodiment, a multi-layer film comprises a first skin layer, a first intermediate layer, a core layer, a second intermediate layer, and a second skin layer arranged sequentially, wherein the core layer has a thickness that is greater than thickness of the first or the second intermediate layers or the skin layer, wherein the core layer includes polybutylene terephthalate (PBT) particles disposed therein, wherein the amount of PBT particles ranges from about 5 to about 10 percent by weight (wt %), based on the total weight of the core layer, wherein the multi-layer film has a thickness ranging from about 25 microns to about 45 microns, wherein the core layer has a thickness ranging from about 20 microns to about 40 microns.

## Claims

### Claim 1

A multi-layer film, comprising:
a core layer having a first side and a second side opposite the first side, wherein the core layer comprises a polymer;
a first intermediate layer disposed on the first side of the core layer;
a second intermediate layer disposed on the second side of the core layer;
a first skin layer disposed on the first intermediate layer and arranged such that the first intermediate layer is disposed between the core layer and the first skin layer; and
a second skin layer disposed on the second intermediate layer and arranged such that the second intermediate layer is disposed between the core layer and the second skin layer,
wherein the core layer has a thickness that is greater than thickness of the first or the second intermediate layers or the skin layer,
wherein the core layer includes polybutylene terephthalate (PBT) particles disposed therein,
wherein the amount of PBT particles ranges from about 1 to about 10 percent by weight (wt %), based on the total weight of the core layer,
wherein the PBT particles have an average particle size from 2 μm to less than 4 μm,
wherein the multi-layer film has a thickness ranging from about 28 microns to about 38 microns,
wherein the core layer has a thickness ranging from about 20 microns to about 29 microns, and
wherein the multi-layer film has a first surface having a gloss ranging from about 60 to about 80, where the gloss is measured by ASTM D2457 at an angle of 45°, and
wherein the multi-layer film has a Z tear interfacial layer force in a range from about 422 g/in to about 1180 g/in.

### Claim 2 (depends on 1)

The multi-layer film of claim 1, wherein the multi-layer film has a thickness ranging from about 35 microns to about 38 microns.

### Claim 3 (depends on 1)

The multi-layer film of claim 1, wherein the core layer has a thickness ranging from about 28 microns to about 29 microns.

### Claim 4 (depends on 1)

The multi-layer film of claim 1, wherein the first and second intermediate layers have thicknesses ranging from about 1 μm to about 5 μm.

### Claim 5 (depends on 1)

The multi-layer film of claim 1, wherein the first and second skin layers have thicknesses ranging from about 1 μm to about 4 μm.

### Claim 6 (depends on 1)

The multi-layer film of claim 1, wherein the multi-layer film has a second surface having a gloss ranging from about 60 to about 77, where the gloss is measured by ASTM D2457 at an angle of 45°.

### Claim 7 (depends on 1)

The multi-layer film of claim 1, wherein the multi-layer film has an opacity ranging from about 80 to about 92, wherein the opacity is measured by TAPPI T425.

### Claim 8 (depends on 1)

The multi-layer film of claim 1, wherein the first and second skin layer are either flame or corona treated or both.

### Claim 9 (depends on 1)

The multi-layer film of claim 1, wherein the core layer further comprises an additive, where the additive is one or more of a stearate including calcium (Ca), a stearate including zinc (Zn), a stearate including manganese (Mg), or fluoropolymers.

### Claim 10 (depends on 9)

The multi-layer film of claim 9, wherein the additive is included in amount of about 0.2 wt % to about 2 wt %, based on the total weight of the core layer.

### Claim 11 (depends on 1)

The multi-layer film of claim 1, wherein the first and second skin layers each include a sealing layer, wherein the sealing layer is capable of generating a heat seal initiation temperature of 75° C. or more, and wherein the multi-layer film has a thickness ranging from 28 microns to about 30 microns.

### Claim 12 (depends on 1)

The multi-layer film of claim 1, wherein the core layer further comprises:
a polymer matrix having voids disposed therein, and
wherein at least some of the voids are occupied by one or more PBT particles.

### Claim 13 (depends on 1)

A label, comprising:
the multi-layer film of claim 1; and
an adhesive layer.

### Claim 14 (depends on 13)

The label of claim 13, wherein the multi-layer film has a thickness ranging from about 35 microns to about 38 microns.

### Claim 15 (depends on 13)

The label of claim 13, wherein the core layer has a thickness ranging from about 28 microns to about 29 microns.

### Claim 16 (depends on 13)

The label of claim 13, wherein the first and second intermediate layers have thicknesses ranging from about 1 μm to about 5 μm.

### Claim 17 (depends on 13)

The label of claim 13, wherein the first and second skin layers have thicknesses ranging from about 1 μm to about 4 μm.

### Claim 18 (depends on 13)

The label of claim 13, wherein the first surface has a gloss ranging from about 60 to about 77 and the multi-layer film has a second surface having a gloss ranging from about 75 to about 80, where the gloss is measured by ASTM D2457 at an angle of 45°.

### Claim 19 (depends on 13)

The label of claim 13, wherein the multi-layer film has an opacity ranging from about 80 to about 92, wherein the opacity is measured by TAPPI T425.

### Claim 20 (depends on 13)

The label of claim 13, wherein the core layer further comprises an additive, where the additive is one or more of a stearate including calcium (Ca), a stearate including zinc (Zn), a stearate including manganese (Mg), or fluoropolymers.