Nitto-denko Corporation

Akiko Nonaka

Shinji Inokuchi

Hiroshi Wada

Masahiko Ando

Disclosed is a release liner having a multilayer structure of at least three layers including two surface layers and an intermediate layer, in which one of the two surface layers contains a high-density polyethylene, the other contains a low-density polyethylene, and the intermediate layer contains a low-density polyethylene alone as its resin component. Also disclosed is a pressure-sensitive adhesive sheet including the release liner and at least one pressure-sensitive adhesive layer, in which a release force X (N/mm) between the release liner and the pressure-sensitive adhesive layer and a rigidity Y of the release liner [(Young's modulus of the release liner)&#xd7;(thickness)] (N&#xb7;mm) satisfy the following conditions: 0&#x3c;X&#x2266;0.285 and 0&#x3c;Y&#x3c;180X+0.1. The release liner and pressure-sensitive adhesive sheet excel in releasability and do not suffer from liner pop-off even when, for example, stored in a curved state. The release liner excels also in recyclability.

Release liner and pressure-sensitive adhesive sheet

A pressure-sensitive adhesive sheet with a release liner has a bubbles containing pressure-sensitive adhesive layer and a release liner in contact with at least one surface of the bubbles containing pressure-sensitive adhesive layer. The release liner comprises at least three layers including an intermediate layer and surface layers, and the surface layers are positioned on both surfaces of the intermediate layer. The intermediate layer comprises at least one polyolefin resin. Each of the surface layers comprises a low-density polyethylene and an olefinic elastomer and independently has a thickness of 15 &#x3bc;m or less. The ratio of the thickness of the intermediate layer to the total thickness of the surface layers (the intermediate layer/the surface layers) is in the range of 4 to 19.

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Ibaraki, Japan

Akiko Nonaka