# US 10,307,985 B2 · Adhesives to replace ink step bezels in electronic devices

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- Number: US 10,307,985 B2
- Document ID: US10307985B2
- Status: Granted
- Kind: B2
- Application number: 15/532,112
- Filed: 2015-12-16
- Published: 2017-09-28
- Granted: 2019-06-04
- Earliest claimed: 2014-12-19
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Audrey A. Sherman; Robert R. Kieschke; Scott M. Tapio
- Web page: https://patentgrep.com/patent/US10307985B2

## CPC

- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 5/142: {Variation across the area of the layer}
- B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material}
- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- B32B 27/365: {comprising polycarbonates}
- C09J 7/10: without carriers
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2307/306: Resistant to heat
- B32B 2307/40: having particular optical properties
- B32B 2307/41: Opaque
- B32B 2307/412: Transparent
- B32B 2307/414: Translucent
- B32B 2307/418: Refractive
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2307/732: Dimensional properties
- B32B 2307/748: Releasability
- B32B 2419/00: Buildings or parts thereof
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- B32B 2457/202: LCD, i.e. liquid crystal displays
- B32B 2457/206: Organic displays, e.g. OLED
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2301/21: the adhesive layer being formed by alternating adhesive areas of different nature
- C09J 2301/302: the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
- C09J 2301/312: parameters being the characterizing feature
- G02F 1/133331: {Cover glasses}
- G02F 2202/28: Adhesive materials or arrangements
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present invention is a two-part adhesive layer including a first, optically clear adhesive composition and a second, light-blocking adhesive composition substantially surrounding the first, optically clear adhesive composition.

## Claims

### Claim 1

A two-part adhesive layer comprising:
a first, optically clear adhesive composition; and
a second, light-blocking adhesive composition substantially surrounding the first, optically clear adhesive composition,
wherein the first, optically clear adhesive composition has a luminous transmission of greater than about 90%, a haze of less than about 2%, and opacity of less than about 1% in the 400 to 700 nm wavelength range.

### Claim 2 (depends on 1)

The two-part adhesive layer of claim 1, wherein the second, light-blocking adhesive composition has a luminous transmission of less than about 90%, a haze of greater than about 2%, and opacity of greater than about 1% in the 400 to 700 nm wavelength range.

### Claim 3 (depends on 1)

The two-part adhesive layer of claim 1, wherein the first, optically clear adhesive composition is a pressure sensitive adhesive.

### Claim 4 (depends on 1)

The two-part adhesive layer of claim 1, wherein the second, light-blocking adhesive composition is a pressure sensitive adhesive.

### Claim 5 (depends on 1)

The two-part adhesive layer of claim 1, wherein the two-part adhesive layer has a thickness of between about 5 microns and about 2 millimeters.

### Claim 6

A laminate comprising:
a first substrate;
a second substrate; and
a two-part adhesive layer situation between and in contact with at least one major surface of the first substrate and at least one major surface of the second substrate, wherein the two-part adhesive layer comprises:
a first, optically clear adhesive composition; and
a second, light-blocking adhesive composition substantially surrounding the first, optically clear adhesive composition,
wherein the first, optically clear adhesive composition has a luminous transmission of greater than about 90%, a haze of less than about 2%, and opacity of less than about 1% in the 400 to 700 nm wavelength range.

### Claim 7 (depends on 6)

The laminate of claim 6, wherein at least one of the first and second substrates is substantially transparent.

### Claim 8 (depends on 6)

The laminate of claim 6, wherein the first substrate, the second substrate, or both the first substrate and the second substrate are selected from a display panel, a touch panel, an optical film, a cover lens, or window.

### Claim 9 (depends on 8)

The laminate of claim 8, wherein the display panel is selected from a liquid crystal display, a plasma display, an OLED display, an electrowetting display, and a cathode ray tube display.

### Claim 10 (depends on 8)

The laminate of claim 8, wherein the optical film is selected from a reflector, a polarizer, a mirror, an anti-glare or anti-reflective film, an anti-splinter film, a diffuser, or electromagnetic interference filter.

### Claim 11 (depends on 6)

The laminate of claim 6, wherein the two-part adhesive layer has a thickness of between about 5 microns and about 250 microns.

### Claim 12 (depends on 6)

The laminate of claim 6, wherein the laminate remains clear after it is placed in an environment of at least 60° C. and 80% relative humidity for at least 72 hours and cooled down to room temperature.

### Claim 13

A method of forming a two-part adhesive layer comprising:
dispensing a first adhesive composition, wherein the first adhesive composition is optically clear; and
dispensing a second adhesive composition, wherein the second adhesive composition is light-blocking, substantially around the first adhesive composition,
wherein the first, optically clear adhesive composition has a luminous transmission of greater than about 90%, a haze of less than about 2%, and opacity of less than about 1% in the 400 to 700 nm wavelength range.

### Claim 14 (depends on 13)

The method of claim 13, wherein the two-part adhesive layer has a thickness of between about 5 microns and about 2 millimeters.

### Claim 15 (depends on 13)

The method of claim 13, wherein the second, light-blocking adhesive composition has a luminous transmission of less than about 90%, a haze of greater than about 2%, and opacity of greater than about 1% in the 400 to 700 nm wavelength range.

### Claim 16 (depends on 13)

The method of claim 13, wherein the first and second adhesive compositions are dispensed onto a transparent substrate.

### Claim 17 (depends on 13)

The method of claim 13, wherein the first adhesive composition is a pressure sensitive adhesive.

### Claim 18 (depends on 13)

The method of claim 13, wherein the second adhesive composition is a pressure sensitive adhesive.