Method of producing an adhesive sheet or a release liner

Patent metadata

Field	Value
Publication number	US-2025297144-A1
Application number	US-202519231679-A
Country	US
Kind code	A1
Filing date	Jun 9, 2025
Priority date	Sep 7, 2018
Publication date	Sep 25, 2025
Grant date	—

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.

First claim

1 . A release liner comprising:
a surface provided with a plurality of ridge portions intersecting with each other, wherein the ridge portions are seamlessly and integrally formed with the surface, and on the surface, a plurality of recesses having different depths are randomly formed between two ridge portions in a surface direction and are continuously connected.

2 . The release liner of claim 1 , further comprising a configuration in which a support and a covering layer are stacked, wherein the recesses and the ridge portions are formed in the covering layer.

3 . The release liner of claim 2 , wherein the support comprises a paper base material including woodfree paper, glassine paper, or kraft paper, or resin including polyethylene terephthalate.

4 . The release liner of claim 2 , wherein the covering layer comprises a thermoplastic resin or another resin.

5 . The release liner of claim 1 , wherein the ridge portions extend linearly or in a bent form on the surface, wherein the recesses are connected to form fine irregularities.

6 . The release liner of claim 1 , wherein the ridge portions have a cross-sectional shape that is triangular, rectangular, trapezoidal, or a variation thereof.

7 . The release liner of claim 1 , wherein the ridge portions are provided so as to be separated from each other at a predetermined pitch.

8 . The release liner of claim 1 , wherein the ridge portions are provided in a grid pattern in which the ridge portions intersect with each other.

9 . The release liner of claim 1 , wherein the recesses are connected even at edges of the ridge portions, forming continuous surface irregularities.

Assignees

• Lintec Corp

Inventors

• Okubo Takuma
• Ohata Kenji
• Yamada Akihito

Classifications

• B29C43/44

  Compression means for making articles of indefinite length · CPC title

• B29C2059/023

  Microembossing · CPC title

• B29C59/022

  characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor · CPC title

• Y10T428/1476

  Release layer · CPC title

• B29C59/04 Primary

  using rollers or endless belts · CPC title