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Pressure-sensitive adhesive sheet with release liner

a technology of pressure-sensitive adhesive and release liner, which is applied in the field of release liner pressure-sensitive adhesive (psa) sheet, can solve the problems of reducing the adhesive performance and fragmentation of the psa layer surface, and achieve the effect of low resistance and high size stability

Inactive Publication Date: 2013-01-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In order to release air from the PSA sheet, it is advantageous to form many channels (air release channels) by shortening the distance between adjacent channels. For instance, Japanese Patent Application Publication No. 2004-149811 describes that air release is secured by limiting the surface structure of the PSA layer so as to include channels with a prescribed combined total volume per 500-μm circle. However, because the PSA layer does not come in tight contact with an adherend at these channels, shortening of the interchannel distance (the channel pitch) results in fragmentation of the PSA layer surface in tight contact with the adherend (bonding surface). Also, shortening of the interchannel distance (i.e. increasing the number of channels per unit area) leads to a decrease in the total bonding surface (net bonding area). Fragmentation of or a decrease in the bonding surface may lower the adhesive performance (e.g., at least either one of the adhesiveness to a curved surface and the peel strength) of the PSA sheet.
[0008]An objective of the present invention is to provide a release-lined PSA sheet that allows efficient release of air without excessive fragmentation of the bonding surface

Problems solved by technology

However, because the PSA layer does not come in tight contact with an adherend at these channels, shortening of the interchannel distance (the channel pitch) results in fragmentation of the PSA layer surface in tight contact with the adherend (bonding surface).
Fragmentation of or a decrease in the bonding surface may lower the adhesive performance (e.g., at least either one of the adhesiveness to a curved surface and the peel strength) of the PSA sheet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0096]Linear low-density polyethylene (LDPE) was laminated by extrusion to form PE layers on both sides of a sheet of high-quality paper with a grammage of 100 g / m2. As for the LDPE, was used a product of Sumitomo Chemical Co., Ltd., product name “Sumikathene CE4009” (LDPE free of phosphorous-based antioxidants; hereinafter, this may be referred to as “PE-0”). A triple-layer sheet comprising high-quality paper (support layer) and PE layers on both sides thereof was so obtained. The laminate sheet had a total thickness of 173 μm, of which the support layer accounted for 119 μm and each PE layer for 27 μm.

[0097]Subsequently, the surface of a first PE layer was treated with release agent. In particular, a commercially available addition-curable-type silicone-based release agent (containing a platinum catalyst, solvent-free type) was applied to the first PE surface in an amount of about 1.0 g / m2 and cured at 125° C. for one minute.

[0098]The release-treated surface (PSA layer side) was s...

examples 2 to 6

[0100]In each of these examples, the heat-pressing was carried out with an embossing mold having a different structure from Example 1 to form a grid protrusion comprising first and second ridge groups orthogonally intersecting each other, with the ridges having a pitch and cross section dimensions as shown in Table 2. Otherwise, release liners of Examples 2 to 6 were prepared in the same way as Example 1. Using these release liners, release-lined PSA sheets of Examples 2 to 6 were prepared in the same way as Example 1.

examples 7 to 12

[0101]A homo-polypropylene (homo-PP) was laminated by extrusion on both sides of a PET film (Toray Industries, Inc., product name “Lumirror S28”) to form PP layers. For the homo-PP, was used a product of Japan Polypropylene Corporation, product name “Novatec FL03H,” (homo-PP free of phosphorous-based antioxidant; hereinafter, may be referred to as “PP-0”). A triple-layer sheet comprising a PET film (support layer) and PP layers on both sides thereof was so prepared. The laminate sheet had a total thickness of 160 μm, of which the support layer contributes to 100 μm and each PP layer to 30 μm.

[0102]Subsequently, the surface of a first PP layer was treated with release agent. In particular, a commercially available addition-curable-type silicone-based release agent (containing a platinum catalyst, solvent-free type) was applied to the first PP surface in an amount of about 0.3 to 0.5 g / m2; and dried and cured at 145° C. for one minute.

[0103]The release-treated surface was subjected to...

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PUM

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Abstract

Provided is a release-lined pressure-sensitive adhesive sheet comprising a release liner 10 and a pressure-sensitive adhesive sheet 20. The release liner 10 has an average linear expansion coefficient of at most 7×10−5 / ° C. between 25° C. and 40° C. A layer 12 to constitute a surface 10A on the pressure-sensitive adhesive layer side of the release liner 10 is formed of a polyolefin-based resin composition containing none or at most 0.01 mass % of a phosphorous-based antioxidant. The surface 10A is divided into a plurality of sections 124 by a plurality of ridges 2A and 2B with each ridge having a height of 5 μm to 50 μm. At least one of the sections 124 inscribes a circle of a diameter greater than 500 μm.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a release-lined pressure-sensitive adhesive (PSA) sheet comprising a PSA layer and a release liner provided thereon. In particular, it relates to a PSA sheet with a release liner, wherein the release liner is provided on the PSA layer side with a plurality of ridges.[0003]This application claims priority based on Japanese Patent Application No. 2008-118984 filed on Apr. 30, 2008 and the entire content of the application is incorporated herein by reference.[0004]2. Description of the Related Art[0005]PSA sheets for applications such as paint-replacements, decorations, surface-protections, etc for vehicle exteriors, housing materials and so on are generally applied to cover a large surface area and required to have aesthetic quality as well. A known technology prevents degradation in the exterior appearance of PSA sheets caused by bubbles trapped upon its application onto an adherend, by r...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B33/00B32B27/00B32B3/00
Inventor NAKAGAWA, YOSHIOUKEI, HIROICHI
Owner NITTO DENKO CORP