# US 2021/0340411 A1 · Release liner, method of producing release liner, adhesive sheet, and method of producing adhesive sheet

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- Number: US 2021/0340411 A1
- Document ID: US20210340411A1
- Status: Published application
- Kind: A1
- Application number: 17/273,437
- Filed: 2019-09-04
- Published: 2021-11-04
- Earliest claimed: 2018-09-07
- Assignees: Lintec Corporation
- Applicants: LINTEC Corporation
- Inventors: Takuma OKUBO; Kenji OHATA; Akihito YAMADA
- Web page: https://patentgrep.com/patent/US20210340411A1

## CPC

- C09J 7/403: {characterised by the structure of the release feature}
- B29C 59/022: {characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor}
- B29C 59/04: using rollers or endless belts
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- 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)}
- C09K 3/00: Materials not provided for elsewhere
- B29C 43/44: Compression means for making articles of indefinite length
- B29C 2059/023: {Microembossing}
- C09J 2301/122: the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
- Y10T 428/1476: Release layer
- 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)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A release liner which makes it difficult for an adhesive layer to impair slidability and makes it easy to exhibit an adhesive force suitably, a method of producing a release liner, an adhesive sheet, and a method of producing an adhesive sheet. A release liner has a surface provided with a ridge portion extending linearly, and on the surface, a plurality of recesses having different depths are randomly formed in a surface direction and are continuously connected.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

A release liner comprising: a surface provided with a ridge portion extending linearly,
wherein, on the surface, a plurality of recesses having different depths are randomly formed in a surface direction and are continuously connected.

### Claim 8 (depends on 7)

The release liner according to claim 7, wherein the plurality of recesses having different depths are randomly formed and are connected even at an edge of a hem of the ridge portion.

### Claim 9

A method of producing a release liner, comprising: a pressing step of pressing a surface of a liner material with a roller,
wherein the roller presses the liner material on an outer peripheral surface of the roller in which a groove extending linearly is provided and a plurality of protrusions having different heights are randomly formed in a surface direction and are continuously connected.

### Claim 10 (depends on 9)

The method of producing a release liner according to claim 9, wherein the roller presses the liner material on the outer peripheral surface on which the plurality of protrusions having different heights are randomly formed and are connected even at an edge of an opening of the groove.

### Claim 11 (depends on 7)

An adhesive sheet comprising the release liner according to claim 7, an adhesive layer disposed on the surface of the release liner, and a base material layer in this order in a stacking direction.

### Claim 12 (depends on 7)

A method of producing an adhesive sheet comprising disposing an adhesive layer on the surface of the release liner according to claim 7 and stacking the release liner, the adhesive layer, and a base material layer in this order.