# US 8,570,470 B2 · Adhesive agent

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- Number: US 8,570,470 B2
- Document ID: US8570470B2
- Status: Granted
- Kind: B2
- Application number: 13/059,923
- Filed: 2009-08-20
- Published: 2011-06-23
- Granted: 2013-10-29
- Earliest claimed: 2008-08-20
- Assignees: LG Chem, Ltd.
- Applicants: Jeong Min Ha; No Ma Kim; In Ho Hwang; Sung Soo Yoon
- Inventors: Jeong Min Ha; No Ma Kim; In Ho Hwang; Sung Soo Yoon
- Web page: https://patentgrep.com/patent/US8570470B2

## CPC

- G02F 1/1333: Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence)
- B05D 5/10: to obtain an adhesive surface
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- G02F 1/133528: {Polarisers}
- C09J 2301/204: the adhesive coating being discontinuous
- C09J 2301/21: the adhesive layer being formed by alternating adhesive areas of different nature
- C09J 2433/00: Presence of (meth)acrylic polymer
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- 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
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are a pressure-sensitive adhesive having excellent durability and reliability under high-temperature or high-humidity conditions, adhesion strength, workability, re-movability, and the ability to inhibit light leakage; a method for preparing the pressure-sensitive adhesive; a polarizer including the pressure-sensitive adhesive; and a liquid crystal display incorporating the polarizer.

## Claims

### Claim 1

A pressure-sensitive adhesive comprising:
a hard area; and
a soft area having a lower storage modulus than the hard area,
wherein the hard area and the soft area are patterned within a single plane and the hard area occupies from 10% to 60%, relative to the entire area of the pressure-sensitive adhesive.

### Claim 2 (depends on 1)

The pressure-sensitive adhesive according to claim 1, wherein the hard area has a storage modulus ranging from 1 MPa to 50 MPa at 30° C.

### Claim 3 (depends on 1)

The pressure-sensitive adhesive according to claim 1, wherein the soft area has a storage modulus ranging from 0.01 MPa to 5.0 MPa at 30° C.

### Claim 4 (depends on 1)

The pressure-sensitive adhesive according to claim 1, wherein the hard area is patterned in the shape of a line.

### Claim 5 (depends on 4)

The pressure-sensitive adhesive according to claim 4, wherein the hard area is patterned in the shape of a continuous line.

### Claim 6 (depends on 1)

The pressure-sensitive adhesive according to claim 1, wherein the ratio (G′hard/G′soft) of the storage modulus (G′hard) of the hard area to the storage modulus (G′soft) of the soft area is 3 to 100.

### Claim 7 (depends on 1)

The pressure-sensitive adhesive according to claim 1, wherein the pressure-sensitive adhesive includes an interpenetrating polymer network.