# US 12,600,884 B2 · Linerless film stack

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,600,884 B2
- Document ID: US12600884B2
- Status: Granted
- Kind: B2
- Application number: 18/026,673
- Filed: 2021-10-08
- Published: 2023-11-02
- Granted: 2026-04-14
- Earliest claimed: 2020-10-14
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Jeffrey O. Emslander; Huiwen Tai; John A. Nielsen
- Web page: https://patentgrep.com/patent/US12600884B2

## CPC

- C09J 7/29: Laminated material (metallised plastics C09J7/22)
- B32B 7/06: permitting easy separation
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- B32B 2250/05: 5 or more layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2264/0214: Particles made of materials belonging to B32B27/00
- B32B 2264/101: Glass
- B32B 2264/107: Ceramic
- B32B 2307/412: Transparent
- B32B 2307/414: Translucent
- B32B 2307/732: Dimensional properties
- B32B 2307/7376: Thickness
- B32B 2307/748: Releasability
- C09J 133/04: Homopolymers or copolymers of esters {(C09J143/04 takes precedence)}
- C09J 2301/122: the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
- C09J 2467/006: in the substrate
- C09J 2477/006: in the substrate
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A film stack is described. In particular, a film stack that includes a co-extrudable first base substrate, a first pressure sensitive adhesive, a release layer, a second pressure sensitive adhesive, and a second base substrate is described. Such film stacks may benefit from reduced waste, simpler manufacturing, and a thinner overall construction versus conventional film stacks.

## Claims

### Claim 1

A film stack, comprising, in order:
a first base substrate;
a first pressure sensitive adhesive;
a release layer;
a second pressure sensitive adhesive;
a second base substrate;
wherein the first base substrate, the first pressure sensitive adhesive, the release layer, the second pressure sensitive adhesive, and the second base substrate are co-extrudable, further comprising at least one of a first protective layer disposed on the first base substrate opposite the first pressure sensitive adhesive and a second protective layer disposed on the second base substrate opposite the second pressure sensitive adhesive wherein the at least one of a first protective layer and the second protective layer includes a polyolefin.

### Claim 2 (depends on 1)

The film stack of claim 1, further comprising at least one of a first tie layer between the first base substrate and the first pressure sensitive adhesive and a second tie layer between the second base substrate and the second pressure sensitive adhesive.

### Claim 3 (depends on 2)

The film stack of claim 2, wherein the at least one of a first tie layer and the second tie layer includes a polyamide or copolyamide.

### Claim 4 (depends on 1)

The film stack of claim 1, wherein the first base substrate and the second base substrate are the same material and thickness.

### Claim 5 (depends on 4)

The film stack of claim 4, wherein the first base substrate and the second base substrate include polylactic acid.

### Claim 6 (depends on 4)

The film stack of claim 4, wherein the first base substrate and the second base substrate include polyurethane.

### Claim 7 (depends on 4)

The film stack of claim 4, wherein the first base substrate and the second base substrate include ionomer resin.

### Claim 8 (depends on 6)

The film stack of claim 6, wherein the first base substrate and the second base substrate include a copolymer of ethylene and methacrylic acid.

### Claim 9 (depends on 4)

The film stack of claim 4, wherein the first base substrate and the second base substrate include ethylene vinyl acetate.

### Claim 10 (depends on 1)

The film stack of claim 1, wherein the first pressure sensitive adhesive and the second pressure sensitive adhesive are the same material and thickness.

### Claim 11 (depends on 10)

The film stack of claim 10, wherein the first pressure sensitive adhesive and the second pressure sensitive adhesive are acrylic pressure sensitive adhesives.

### Claim 12 (depends on 1)

The film stack of claim 1, wherein the film stack is symmetrical on both sides of the release layer, in terms of material composition and thickness.

### Claim 13 (depends on 1)

The film stack of claim 1, wherein the release layer includes an olefin block copolymer.

### Claim 14 (depends on 1)

The film stack of claim 1, wherein the release layer includes a silicone resin.