Release sheet and pressure-sensitive adhesive article

• US 20060216452A1
• Filed: 03/21/2006
• Published: 09/28/2006
• Est. Priority Date: 03/22/2005
• Status: Active Grant

• Current Assignee: Lintec Corporation
• Original Assignee: Lintec Corporation
• Inventors: Nishida, Takuo, Sasaki, Yasushi, Tomita, Daisuke
• Granted Patent: US 7,897,229 B2
• Time in Patent Office: Days
• US Class Current: 428/40.100
• CPC Class Codes: B32B 2307/748 Releasability
• CPC Class Codes: B32B 2405/00 Adhesive articles, e.g. adhesive tapes labels B32B2519/00
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 25/04 comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/043; next to a bituminous or tarry layer B32B11/044; next to a water setting substance layer B32B13/042; next to a metal layer B32B15/06; next to a glass layer B32B17/063; next to a layer formed of natural mineral fibres or particles B32B19/043; next to a wood layer B32B21/045; next to a cellulosic plastic layer B32B23/046
• CPC Class Codes: B32B 25/042 of natural rubber or synthetic rubber
• CPC Class Codes: B32B 25/18 comprising butyl or halobutyl rubber
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C09J 2409/005 in the release coating
• CPC Class Codes: C09J 2423/005 in the release coating
• CPC Class Codes: C09J 7/401 characterised by the release coating composition
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1476 Release layer

Abstract

A pressure-sensitive adhesive article 100 includes a release sheet 1 constituted from a releasing agent layer 11 and a base material 12, and a pressure-sensitive adhesive sheet 2 constituted from a pressure-sensitive adhesive layer 21 and a pressure-sensitive adhesive sheet base 22. Such a pressure-sensitive adhesive article 100 has a structure in which the pressure-sensitive adhesive sheet 2 is laminated on the release sheet 1 so that the pressure-sensitive adhesive layer 21 is in contact with the releasing agent layer 11. The releasing agent layer 11 is composed of a material containing substantially no silicone compound. The releasing agent layer 11 is mainly composed of an elastomer and has a Young'"'"'s modulus of 1.5 GPa or less. Preferred examples of the elastomer include polybutadiene rubber (especially, 1,4-polybutadiene rubber), polyisoprene rubber, and ethylene propylene rubber. The release sheet 1 has excellent releasability and has little adverse effect on electric components and the like.

Claims

1. A release sheet comprising:

a base material; and

a releasing agent layer provided on the base material, wherein the releasing agent layer contains substantially no silicone compound, and is mainly composed of an elastomer, and has a Young'"'"'s modulus of 1.5 GPa or less.

2. The release sheet as claimed in claim 1, wherein the releasing agent layer is mainly composed of at least one elastomer selected from the group consisting of polybutadiene rubber, polyisoprene rubber, and ethylene propylene rubber.

3. The release sheet as claimed in claim 1, wherein the average thickness of the releasing agent layer is in the range of 0.01 to 1.0 μ

m.

4. The release sheet as claimed in claim 1, further comprising a primer layer provided between the releasing agent layer and the base material.

5. The release sheet as claimed in claim 4, wherein the Young'"'"'s modulus of the primer layer is 1.5 GPa or less.

6. The release sheet as claimed in claim 4, wherein the average thickness of the primer layer is in the range of 0.02 to 10.0 μ

m.

7. The release sheet as claimed in claim 4, wherein the Young'"'"'s modulus of the primer layer is lower than that of the base material.

8. A pressure-sensitive adhesive article comprising:

the release sheet as claimed in claim 1;

and

a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer.