# US 5,330,812 A · Sheet material with improved cut resistance

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- Number: US 5,330,812 A
- Document ID: US5330812A
- Status: Granted
- Kind: A
- Application number: 07/867,634
- Filed: 1992-04-13
- Granted: 1994-07-19
- Earliest claimed: 1990-11-13
- Assignees: Mobil Oil Corporation
- Inventors: Anthony R. Knoerzer; Pang-Chia Lu; Conway F. Shields; Donald G. Whyman
- Web page: https://patentgrep.com/patent/US5330812A

## CPC

- B32B 7/06: permitting easy separation
- A61F 13/0246: characterised by the skin-adhering layer
- A61F 13/0259: {characterised by the release liner covering the skin adhering layer}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- G09F 3/02: Forms or constructions (layered products B32B)
- G09F 3/10: by an adhesive layer
- B32B 2307/558: Impact strength, toughness
- B32B 2323/10: Polypropylene
- B32B 2519/00: Labels, badges
- G09F 2003/0255: {laminated}
- G09F 2003/0267: {die cut}
- G09F 2003/0285: {Stamp-like labels}
- Y10T 428/1419: Wax containing
- Y10T 428/31692: Next to addition polymer from unsaturated monomers
- Y10T 428/31696: Including polyene monomers [e.g., butadiene, etc.]
- Y10T 428/31743: Next to addition polymer from unsaturated monomer[s]
- Y10T 428/3175: Next to addition polymer from unsaturated monomer[s]
- Y10T 428/3188: Next to cellulosic
- Y10T 428/31895: Paper or wood
- Y10T 428/31913: Monoolefin polymer
- Y10T 428/31917: Next to polyene polymer
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composite material comprising a base liner with a release layer on at least one surface thereof, and a releasable face layer releasably adhered to the base liner through the release layer by a pressure sensitive adhesive, wherein the base liner has a skin layer on its surface proximate to the release layer which is more difficult to cut than the remainder of the base liner material, such that when the composite is subjected to die cutting or perforating to allow portions of the face layer to be selectively removed, the cutter will not penetrate into or through the base liner to any substantial extent.

## Claims

### Claim 1

In a thin film form composite material comprising a base liner film form material, a release layer on at least one surface of said base liner, a pressure sensitive adhesive layer disposed on said release layer, and a peelable face layer film form material disposed on said pressure sensitive adhesive, such that said adhesive layer adheres more strongly to said face layer than to said release layer on said base liner, said face layer being releasable adhered to said release layer on said base liner by means of said adhesive;
the improvement, whereby allowing said composite material to be subjected to a die cutting or perforating operation whereby said face layer and adhesive are cut through so as to make such peelable from said composite, but said base liner is not substantially cut through to an extent such that, if said cut face layer is peeled from said release layer, said base liner retains its integrity, which comprises:
the surface of said base liner adjacent to said release layer being modified to provide a thin and tough skin of polymeric material, comprising up to about 5% in thickness of said base liner, which is more cut resistant than is the remainder of said base liner material to an extent sufficient to maintain the integrity thereof after die cutting of said face layer.

### Claim 2 (depends on 1)

A composite material as claimed in claim 1 wherein said base liner comprises at least one material selected from the group consisting of polypropylene, polyethylene, polyethylene terephthalate, polystyrene, nylon, polyurethane, paper and metal foil.

### Claim 3 (depends on 1)

A composite material as claimed in claim 1 wherein said face layer comprises at least one material selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, and metal foil.

### Claim 4 (depends on 1)

A composite material as claimed in claim 1 wherein said skin is at least one material disposed on the surface of said base liner which is selected from the group consisting of ethylene-propylene copolymer, ultra low density polyethylene, high impact polystyrene, wax modified polypropylene, and ethylene-butene-1 copolymer.

### Claim 5 (depends on 1)

A composite material as claimed in claim 1 wherein said skin comprises the integral surface layer of said base liner which is modified to make it more cut resistant than the remainder of the base liner.

### Claim 6 (depends on 1)

A composite material as claimed in claim 1 including indica disposed on said face layer.

### Claim 7 (depends on 5)

A composite material as claimed in claim 5 wherein said skin layer material is substantially softer than the remainder of said base liner.

### Claim 8 (depends on 1)

A composite film form material as claimed is claim 1 wherein said face layer is a peelable label.