# US 8,541,087 B2 · Pressure-sensitive adhesive, sheet for manufacturing an optical recording medium and optical recording medium

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

- Number: US 8,541,087 B2
- Document ID: US8541087B2
- Status: Granted
- Kind: B2
- Application number: 13/058,405
- Filed: 2009-06-25
- Published: 2011-06-16
- Granted: 2013-09-24
- Earliest claimed: 2008-08-18
- Assignees: Lintec Corporation
- Applicants: Naoki Taya; Masaharu Ito; Takashi Morioka
- Inventors: Naoki Taya; Masaharu Ito; Takashi Morioka
- Web page: https://patentgrep.com/patent/US8541087B2

## CPC

- B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/08: of synthetic resin
- G11B 7/256: of layers improving adhesion between layers
- Y10T 428/21: Circular sheet or circular blank
- Y10T 428/28: Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T 428/2852: Adhesive compositions
- Y10T 428/2887: including nitrogen containing polymer [e.g., polyacrylonitrile, polymethacrylonitrile, etc.]
- Y10T 428/2891: including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A sheet (1) for manufacturing an optical disc which includes a pressure-sensitive adhesive layer (11), having a peak temperature of a loss tangent not higher than −10° C. and a polar component (γPs) of the surface energy not smaller than 2.0 mJ/m2, and a protective sheet (12), is laminated on a data recording layer (3) (a laminate formed of a reflecting layer (31), a dielectric layer (32), a phase change layer (33) and a dielectric layer (32′)) that is formed on an optical disc substrate (2). The sheet for manufacturing an optical disk (1) allows obtaining an optical recording medium that is provided with the pressure-sensitive adhesive layer (11) that has high adhesion to the data recording layer (3) and does not peel readily off adjacent layers.

## Claims

### Claim 1

A pressure-sensitive adhesive that forms a pressure-sensitive adhesive layer provided adjacent to a data recording layer of an optical recording medium, wherein
a peak temperature of a loss tangent is not higher than −10° C., and
a polar component γPs of a surface energy of the pressure-sensitive adhesive layer is not smaller than 2.0 mJ/m2.

### Claim 2

A sheet for manufacturing an optical recording medium having a data recording layer, comprising: a pressure-sensitive adhesive layer provided adjacent to the data recording layer, wherein
the pressure-sensitive adhesive layer has a peak temperature of a loss tangent not higher than −10° C., and has a polar component γPs of a surface energy not smaller than 2.0 mJ/m2.

### Claim 3 (depends on 2)

The sheet for manufacturing an optical recording medium according to claim 2, wherein a pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer has a (meth)acrylate copolymer as a main component.

### Claim 4 (depends on 3)

The sheet for manufacturing an optical recording medium according to claim 3, wherein the (meth)acrylate copolymer has a nitrogen atom-containing copolymerizable monomer as a monomer component.

### Claim 5 (depends on 3)

The sheet for manufacturing an optical recording medium according to claim 3, wherein the (meth)acrylate copolymer has methyl (meth)acrylate as a monomer component.

### Claim 6 (depends on 3)

The sheet for manufacturing an optical recording medium according to claim 3, wherein the (meth)acrylate copolymer does not contain an acidic group.

### Claim 7 (depends on 2)

The sheet for manufacturing an optical recording medium according to claim 2, wherein a protective layer that forms an optical recording medium is laminated on the pressure-sensitive adhesive layer.

### Claim 8 (depends on 2)

The sheet for manufacturing an optical recording medium according to claim 2, wherein a pressure-sensitive adhesive strength is not lower than 8.0 N/25 mm.

### Claim 9 (depends on 1)

An optical recording medium, manufactured using the pressure-sensitive adhesive according to claim 1.

### Claim 10

An optical recording medium that comprises at least a data recording layer and a pressure-sensitive adhesive layer adjacent to the data recording layer, wherein
a peak temperature of a loss tangent of the pressure-sensitive adhesive layer is not higher than −10° C., and
a polar component γPs of a surface energy of the pressure-sensitive adhesive layer is not smaller than 2.0 mJ/m2.

### Claim 11 (depends on 2)

An optical recording medium, manufactured using an optical recording medium according to claim 2.