# US 12,180,396 B2 · Multi-phase adhesive articles and methods thereof

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- Number: US 12,180,396 B2
- Document ID: US12180396B2
- Status: Granted
- Kind: B2
- Application number: 17/638,534
- Filed: 2020-08-21
- Published: 2022-12-22
- Granted: 2024-12-31
- Earliest claimed: 2019-09-25
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Dmitriy Salnikov; Kristin L. Thunhorst; Nathan L. Gergen; Henrik B. van Hengerich
- Web page: https://patentgrep.com/patent/US12180396B2

## CPC

- C09J 7/10: without carriers
- B32B 3/08: characterised by added members at particular parts {(layer formed of separate pieces of material which are juxtaposed side-by-side B32B3/14, B32B3/18)}
- C09J 2203/354: for automotive applications
- C09J 2301/208: the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
- C09J 2301/21: the adhesive layer being formed by alternating adhesive areas of different nature
- C09J 2301/312: parameters being the characterizing feature
- C09J 2463/00: Presence of epoxy resin
- 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

Provided are adhesive articles and related methods of making and use. The adhesive article includes one or more patterned adhesive layers comprising compositionally and spatially distinct adhesives that are laterally disposed relative to each other. The first and second adhesives are optionally capable of being functionally cured to provide a structural adhesive bond with a substrate. These adhesives can provide high fracture toughness and high modulus characteristics not otherwise possible in a homogeneous adhesive composition. These adhesives can provide some degree of crack arrestment and significantly reduce the need for mechanical fasteners in industrial bonding applications.

## Claims

### Claim 1

An adhesive article comprising:
a first patterned adhesive layer comprising first and second adhesives that are compositionally and spatially distinct, and laterally disposed relative to each other within the first patterned adhesive layer, wherein the first patterned adhesive layer has at least one exposed major surface that is tacky at ambient temperature; and
one or more release liners disposed on one or both exposed major surfaces,
wherein the first and second adhesives are each structural adhesives capable of being functionally cured to provide, collectively, a structural adhesive bond with a substrate.

### Claim 2 (depends on 1)

The adhesive article of claim 1, wherein each of the first and second adhesives is capable of being functionally cured to provide a structural adhesive bond with the substrate.

### Claim 3

An adhesive article comprising:
a first patterned adhesive layer comprising first and second adhesives that are compositionally and spatially distinct, and laterally disposed relative to each other within the first patterned adhesive layer; and
a second patterned adhesive layer disposed on the first patterned adhesive layer and comprising third and fourth adhesives that are compositionally and spatially distinct, and laterally disposed relative to each other within the second patterned adhesive layer,
wherein first and second patterned adhesive layers have respective patterns that do not substantially coincide with each other when viewed from a direction perpendicular to the first and second patterned adhesive layers.

### Claim 4 (depends on 3)

The adhesive article of claim 3, wherein the third and fourth adhesives have the same compositions as the first and second adhesives, respectively.

### Claim 5 (depends on 3)

The adhesive article of claim 3, wherein the first and/or second adhesives are capable of being functionally cured to provide, collectively, a structural adhesive bond with a substrate.

### Claim 6 (depends on 3)

The adhesive article of claim 3, wherein the third and/or fourth adhesives are capable of being functionally cured to provide a structural adhesive bond with a substrate.

### Claim 7 (depends on 1)

The adhesive article of claim 1, further comprising a continuous adhesive layer disposed on the first patterned adhesive layer, wherein the continuous adhesive layer comprises either the first or second adhesive.

### Claim 8 (depends on 1)

The adhesive article of claim 1, wherein the first adhesive displays a fracture energy when functionally cured that is substantially different from that of the second adhesive over temperatures from −55?C to 121?C based on ASTM D3433-00 (2012).

### Claim 9 (depends on 1)

The adhesive article of claim 1, wherein the first and second adhesives are arranged according to a stripe pattern.

### Claim 10 (depends on 1)

The adhesive article of claim 1, wherein the first adhesive displays a fracture strength greater than that of the second adhesive at −55?C and the second adhesive displays a fracture strength greater than that of the first adhesive at 121?C, based on ASTM D3433-00 (2012).

### Claim 11 (depends on 1)

The adhesive article of claim 1, wherein the first adhesive has a storage modulus when functionally cured, as measured on a dynamic mechanical analyzer at 25?C, amplitude of 15 micrometers, and frequency of 1 Hz, that is substantially different from that of the second adhesive.

### Claim 12 (depends on 1)

The adhesive article of claim 1, wherein the first adhesive has a glass transition temperature when functionally cured that is substantially different from that of the second adhesive when functionally cured.

### Claim 13 (depends on 1)

The adhesive article of claim 1, wherein the first and second adhesives are thermally curable and further wherein the first adhesive has a peak exotherm temperature as measured by differential scanning calorimetry that is substantially different from that of the second adhesive.