# US 2013/0156946 A1 · Pressure-sensitive adhesive product

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- Number: US 2013/0156946 A1
- Document ID: US20130156946A1
- Status: Published application
- Kind: A1
- Application number: 13/770,424
- Filed: 2013-02-19
- Published: 2013-06-20
- Earliest claimed: 2009-04-03
- Assignees: Nitto Denko Corporation
- Inventors: Hiroshi WADA; Akiko TAKAHASHI
- Web page: https://patentgrep.com/patent/US20130156946A1

## CPC

- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 7/22: Plastics; Metallised plastics
- C09J 7/385: {Acrylic polymers}
- B29L 2031/744: {Labels, badges, e.g. marker sleeves}
- C09J 2301/312: parameters being the characterizing feature
- G09F 2003/023: {Adhesive}
- Y10T 428/1476: Release layer
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- 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)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is a pressure-sensitive adhesive (PSA) product having specifications in which the level of volatile organic compound emissions has been minimized, and effectively displaying those specifications. The PSA product includes a PSA layer having an adhesive face capable of attaching to an adherend, and a backing sheet disposed on a back face of the PSA layer. The PSA layer produces toluene emissions of at most 20 μg/g and produces total volatile organic compound emissions of at most 300 μg/g. The backing sheet has a mark in a color selected from green and blue displayed on a back face thereof.

## Claims

### Claim 1

A method for manufacturing, a pressure-sensitive adhesive product comprising the steps of:
preparing a water-dispersed acrylic polymer in the form of an emulsion of an acrylic polymer dispersed in water;
preparing an emulsion of a tackifying resin containing substantially no aromatic hydrocarbon solvent;
preparing a water-dispersed pressure-sensitive adhesive composition comprising the water-dispersed acrylic polymer and the emulsion of the tackifying resin;
forming a pressure-sensitive adhesive layer from the water-dispersed pressure-sensitive adhesive composition on a front face of a backing sheet having the front face and an opposing back face; and
displaying, a mark in green and/or blue on the hack face of the hacking sheet;
wherein
the pressure-sensitive adhesive layer has an adhesive face and an opposing back face, wherein the adhesive face is capable of attaching to an adherend, and the backing sheet is disposed on the back face of the pressure-sensitive adhesive layer, and
the pressure-sensitive adhesive layer produces toluene emissions when heated at 80° C. for 30 minutes of at most 20 μg per gram of the pressure-sensitive adhesive layer and produces total volatile organic compound emissions when heated at 80° C. for 30 minutes of at most 300 μg per gram of the pressure-sensitive adhesive layer.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the mark comprises a combination of the color with a letter, image or symbol, or a combination thereof, which indicates a low level of the volatile organic compound emissions.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the mark is green.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the mark has a surface area which accounts for 5% to 50% of a surface area of the hack face of the backing sheet.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the pressure-sensitive adhesive layer is a double-sided pressure-sensitive adhesive sheet comprising a non-releasable substrate having on each side thereof a pressure-sensitive adhesive.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the amount of the tackifying resin is 10 to 80 parts by weight relative to 100 parts by weight of the acrylic polymer on solid basis.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the backing sheet is a paper which is laminated with a layer of polyethylene.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the front face of the backing sheet is a release face from which the back face of the pressure-sensitive adhesive layer is releasable.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the size of the mark is at least 1 mm×1 mm.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the proportion of an alkyl (meth)acrylate relative to the overall amount of monomer ingredients making up the acrylic polymer is at least 80% by weight, and an alkyl group of the alkyl (meth)acrylate has 1 to 20 carbon atoms.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the alkyl (meth)acrylate is at least one selected from the group consisting of butyl acrylate and 2-ethylhexyl acrylate.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the tackifying resin comprises a polymerized resin.

### Claim 13 (depends on 7)

The method according to claim 7, wherein the paper is at least one selected from the group consisting of kraft paper, glassine, wood-free paper, synthetic paper and topcoated paper.