# US 9,752,061 B2 · Adhesive sheet and method for manufacturing adhesive sheet

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- Number: US 9,752,061 B2
- Document ID: US9752061B2
- Status: Granted
- Kind: B2
- Application number: 14/430,996
- Filed: 2013-09-27
- Published: 2015-09-03
- Granted: 2017-09-05
- Earliest claimed: 2012-09-28
- Assignees: Lintec Corporation; Nippon Paint Co., Ltd.; Nippon Fine Coatings, Inc.
- Applicants: Lintec Corporation; Nippon Paint Co., Ltd.; Nippon Fine Coatings, Inc.
- Inventors: Kiichiro Kato; Yumiko Amino
- Web page: https://patentgrep.com/patent/US9752061B2

## CPC

- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- B05D 1/34: Applying different liquids or other fluent materials simultaneously
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 27/20: using fillers, pigments, thixotroping agents
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 133/04: Homopolymers or copolymers of esters {(C09J143/04 takes precedence)}
- B32B 2264/102: Oxide or hydroxide
- B32B 2405/00: Adhesive articles, e.g. adhesive tapes
- C08K 3/36: Silica
- C09J 133/00: Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J 2301/208: the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
- C09J 2301/302: the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
- C09J 2301/408: additives as essential feature of the adhesive layer
- C09J 2400/10: Presence of inorganic materials
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2467/006: in the substrate
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- Y10T 428/249983: As outermost component
- 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)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is an adhesive sheet comprising a support substrate, an adhesive agent layer (X), a continuous void-containing layer composed of a composition containing an adhesive agent and silica particles, and an adhesive agent layer (Y) that are laminated in this order, wherein the adhesive sheet that has a content by mass of the silica particles in the continuous void-containing layer of 25 to 60%; and when affixed to a surface of various plastic molded articles, the adhesive sheet prevents swelling or lifting, in other words, blistering after a lapse of time, to allow the surface of its support substrate to be smooth and to have an excellent appearance, wherein the adhesive sheet can exhibit excellent blister resistance regardless of the type of adhesive agent, and is furthermore easy to manufacture.

## Claims

### Claim 1

An adhesive sheet, comprising:
a support substrate;
a first adhesive agent layer;
a continuous void-containing layer comprising an adhesive agent and silica particles; and
a second adhesive agent layer,
wherein the support substrate, the first and second adhesive agent layers, and the continuous void-containing layer are laminated in an order of the support substrate, the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer, and
the silica particles are included in the continuous void-containing layer in an amount of from 25 to 60% by mass.

### Claim 2 (depends on 1)

The adhesive sheet according to claim 1, wherein an increment in thickness due to voids of the continuous void-containing layer is from 120 to 170%.

### Claim 3 (depends on 1)

The adhesive sheet according to claim 1, wherein the silica particles in the continuous void-containing layer have a volume-average secondary particle size of 0.5 to 10 μm.

### Claim 4 (depends on 1)

A method for manufacturing the adhesive sheet according to claim 1, the method comprising:
simultaneously applying at least two of the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer to the support substrate by a multi-layer coater.

### Claim 5 (depends on 1)

A method for manufacturing the adhesive sheet according to claim 1, the method comprising:
laminating each of the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer on the support substrate by bonding.

### Claim 6 (depends on 2)

The adhesive sheet according to claim 2, wherein the silica particles in the continuous void-containing layer have a volume-average secondary particle size of 0.5 to 10 μm.

### Claim 7 (depends on 2)

A method for manufacturing the adhesive sheet according to claim 2, the method comprising:
simultaneously applying at least two of the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer to the support substrate by a multi-layer coater.

### Claim 8 (depends on 3)

A method for manufacturing the adhesive sheet according to claim 3, the method comprising:
simultaneously applying at least two of the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer to the support substrate by a multi-layer coater.

### Claim 9 (depends on 2)

A method for manufacturing the adhesive sheet according to claim 2, the method comprising:
laminating each of the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer on the support substrate by bonding.

### Claim 10 (depends on 3)

A method for manufacturing the adhesive sheet according to claim 3, the method comprising:
laminating each of the first adhesive agent layer, the continuous void-containing layer, and the second adhesive agent layer on the support substrate by bonding.

### Claim 11 (depends on 1)

The adhesive sheet according to claim 1, wherein the support substrate comprises a plastic film and a metal layer.

### Claim 12 (depends on 11)

The adhesive sheet according to claim 11, wherein the plastic film comprises at least one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, an ethylene-vinyl acetate copolymer, polystyrene, polycarbonate, polymethylpentene, polysulfone, polyether ether ketone, polyether sulfone, polyphenylene sulfide, polyether imide, polyimide, a fluorine resin, polyamide, an acrylic resin, a norbornene-based resin, and a cycloolefin resin.

### Claim 13 (depends on 11)

The adhesive sheet according to claim 11, wherein the metal layer comprises at least one selected from the group consisting of aluminum, tin, chromium, and titanium.

### Claim 14 (depends on 1)

The adhesive sheet according to claim 1, wherein the support substrate comprises a plastic film and a metal layer such that the first adhesive agent layer is laminated on the metal layer of the support substrate.

### Claim 15 (depends on 1)

The adhesive sheet according to claim 1, wherein the silica particles are included in the continuous void-containing layer in an amount of from 30 to 50% by mass.

### Claim 16 (depends on 11)

The adhesive sheet according to claim 11, wherein the plastic film has a thickness of from 5 to 200 μm.

### Claim 17 (depends on 1)

The adhesive sheet according to claim 1, wherein the continuous void-containing layer has a thickness of from 5 to 100 μm.

### Claim 18 (depends on 1)

The adhesive sheet according to claim 1, wherein the continuous void-containing layer has a composition different from compositions of the first and second adhesive agent layers.

### Claim 19 (depends on 1)

The adhesive sheet according to claim 1, wherein each of the first and second adhesive agent layers has a thickness of from 5 to 50 μm.

### Claim 20 (depends on 1)

The adhesive sheet according to claim 1, further comprising:
a release sheet laminated on the second adhesive agent layer on a side opposite to the continuous void-containing layer.