# US 8,541,077 B2 · Oriented multi-layer shrink labels

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- Number: US 8,541,077 B2
- Document ID: US8541077B2
- Status: Granted
- Kind: B2
- Application number: 12/093,891
- Filed: 2006-11-02
- Published: 2009-09-03
- Granted: 2013-09-24
- Earliest claimed: 2005-11-15
- Assignees: Dow Global Technologies LLC
- Applicants: Rajen M. Patel; Debra H. Niemann; Pak-Wing S. Chum; Moris Amon; Evgueni Rozenbaoum; Chia-Hsi Chu
- Inventors: Rajen M. Patel; Debra H. Niemann; Pak-Wing S. Chum; Moris Amon; Evgueni Rozenbaoum; Chia-Hsi Chu
- Web page: https://patentgrep.com/patent/US8541077B2

## CPC

- G09F 3/04: to be fastened or secured by the material of the label itself, e.g. by thermo-adhesion (by a separate adhesive layer G09F3/10)
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/514: Oriented
- B32B 2307/702: Amorphous
- B32B 2307/72: Density
- B32B 2307/736: Shrinkable
- B32B 2519/00: Labels, badges
- Y10T 428/1328: Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
- Y10T 428/1334: Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
- Y10T 428/1341: Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1386: Natural or synthetic rubber or rubber-like compound containing
- Y10T 428/1393: Multilayer [continuous layer]
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/254: Polymeric or resinous material
- Y10T 428/31786: Of polyester [e.g., alkyd, etc.]
- Y10T 428/31794: Of cross-linked polyester
- Y10T 428/31797: Next to addition polymer from unsaturated monomers
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- Y10T 428/31913: Monoolefin polymer
- Y10T 428/3192: Next to vinyl or vinylidene chloride polymer
- Y10T 428/31924: Including polyene monomers
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- 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

The present invention relates to a multi-layer oriented shrink film comprising at least one skin layer comprising a polystyrene material and at least one core layer comprising a polyolefin layer. The films are preferably primarily oriented in either the machine or the cross direction. These films are ideally suited for use as a shrink label which can be applied either as a CD shrink sleeve or applied using a continuous roll process. The films ideally have an overall density of less than 1.0 g/cm3, to facilitate recycling efforts.

## Claims

### Claim 1

A multi-layer oriented shrink film comprising at least one skin layer comprising an amorphous glassy polymer material and at least one core layer comprising a polyolefin layer wherein the shrink film has been subjected to either biaxial orientation with preferential orientation of at least two times in either the machine or cross direction or monoaxial orientation; and wherein the polyolefin material is a propylene interpolymer prepared using a nonmetallocene, metal-centered, heteroaryl ligand catalyst in combination with one or more activators.

### Claim 2 (depends on 1)

The multi-layer film of claim 1 wherein the amorphous glassy polymer is a polystyrene material.

### Claim 3 (depends on 1)

The multi-layer film of claim 1 wherein the overall density of the film is less than 1.0 g/cm3.

### Claim 4 (depends on 3)

The multi-layer film of claim 3 wherein the overall density of the film is less than 0.98 g/cm3.

### Claim 5 (depends on 1)

The multi-layer film of claim 1 wherein the orientation is biaxial orientation with orientation in one direction which is at least three times that of the opposite direction.

### Claim 6 (depends on 1)

The multi-layer film of claim 1 wherein the orientation is biaxial orientation with orientation in one direction which is at least four times that of the opposite direction.

### Claim 7 (depends on 1)

The multi-layer film of claim 1 wherein the film has a shrink tension less than 500 psi.

### Claim 8 (depends on 1)

The multi-layer film of claim 1 wherein the film has a shrink tension less than 250 psi.

### Claim 9 (depends on 1)

The multi-layer film of claim 1 further comprising a tie layer between the at least one skin layer and the at least one core layer.

### Claim 10 (depends on 2)

The multi-layer film of claim 2 wherein the polystyrene material comprises one or more of GPPS, HIPS; SBS; SIS; or SEBS.

### Claim 11 (depends on 10)

The multi-layer film of claim 10 where the polystyrene material comprises HIPS having an average rubber particle size of less than about 1 micron.

### Claim 12 (depends on 1)

The multi-layer film of claim 1 wherein the amorphous glassy polymer material comprises one or more of PETG, amorphous PET, amorphous PLA or PVC.

### Claim 13 (depends on 9)

The multi-layer film of claim 9 wherein the tie layer comprises one or more of SEBS, SEPS, EVA, SBS, SIS; or SEBS.

### Claim 14 (depends on 9)

The multi-layer film of claim 9 wherein the film comprises two skin layers each of which comprises an amorphous glassy polymer, and wherein the amorphous glassy polymer skin layers comprise 10% to 80% by weight of the entire film and the polyolefin layer comprises 20 to 90 percent by weight of the entire film and the tie layer comprises from 5 to 15 percent by weight of the entire film.

### Claim 15 (depends on 1)

A shrink label comprising a multi-layer film of claim 1.

### Claim 16 (depends on 15)

The shrink label of claim 15 wherein the shrink label is a roll-on shrink-on (ROSO) label.

### Claim 17 (depends on 15)

The shrink label of claim 15 wherein the shrink label is a sleeve-type label.

### Claim 18 (depends on 16)

The shrink label of claim 16 characterized in that the label shrinks greater than 40% at 135° C. in the direction of preferential orientation.

### Claim 19 (depends on 17)

The shrink label of claim 17 characterized in that the label shrinks greater than 40% at 135° C. in the direction of preferential orientation.