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double sided adhesive sheet

A sticking sheet, double-sided technology, applied in the direction of adhesives, adhesive products, adhesive types, etc., can solve the problem of not being able to keep smoothness, and achieve the effect of inhibiting agglomeration

Active Publication Date: 2018-06-05
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as the coiling length of rolls has become longer in recent years, the use of conventional double-sided adhesive sheets cannot sufficiently prevent the occurrence of orange peel defects
In addition, when the release film on one side is peeled from the adhesive layer, a part of the adhesive layer adheres to the release film on one side, and the smoothness and good appearance cannot be maintained on the first release film. Phenomenon of the adhesive layer, that is, a problem called lacrimal transfer phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] 1. Fabrication of the first layer of peel-off film

[0120] As the first base film, a polyethylene terephthalate (PET) film (thickness 38 μm, arithmetic average roughness Ra: 20 nm, maximum protrusion height Rp: 203 nm) having the same surface roughness was prepared.

[0121] Then, using a bar coater, the composition A for forming the first release agent layer with the following composition was applied to one side of the first base film so that the thickness after drying was 0.1 μm, and the composition A at 120° C. Dry for 1 minute, and set it as the first release agent layer. A first-layer release film was obtained by the method described above. The arithmetic mean roughness of the surface on the side of the first release agent layer and the surface on the side of the first base film (the surface opposite to the surface to which the adhesive layer is bonded) of the obtained first release film Table 1 shows Ra, the maximum protrusion height Rp, and the proportion of i...

Embodiment 2

[0135] A double-sided adhesive sheet similar to that of Example 1 was produced except that the release film obtained as follows was used as the second release film.

[0136] A polyethylene terephthalate (PET) film (thickness: 38 μm, arithmetic mean roughness Ra: 40 nm, maximum protrusion height Rp: 495 nm) having the same surface roughness was prepared.

[0137] Then, the composition A for forming a resin layer was coated on the outer surface of the above-mentioned PET film by using a bar coater, and heat-dried at 150° C. for 40 seconds to harden the resin material to form a film having a thickness of 0.6 μm. resin layer to complete the production of the second layer of base film.

[0138] In addition, as the composition A for forming the resin layer, diphenol propane A-type epoxy resin ester resin solution (solid content concentration: 60% by mass) having a hydroxyl group as the main ingredient was used as a cross-linking agent added as the main ingredient. The methylated cy...

Embodiment 3

[0142] A double-sided adhesive sheet was produced in the same manner as in Example 2 above except that the thickness of the resin layer of the second base film was 0.8 μm.

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Abstract

The double-sided adhesive sheet of the present invention is characterized in that it has an adhesive layer having a first surface and a second surface, a first release film bonded to the first surface of the adhesive layer, and , the second release sheet bonded on the second surface of the adhesive layer, the release force of the second release film from the adhesive layer is higher than that of the first release film from The peeling force of the adhesive layer is small, and the arithmetic average roughness Ra of the surface on the opposite side of the surface where the first layer of release film and the second layer of release film are attached to the adhesive layer is 5-35nm, and the maximum protrusion height Rp is 50-400nm. In this way, when the double-sided adhesive sheet is wound up into a roll, it is possible to prevent a plurality of minute irregularities from occurring on the surface of the adhesive layer.

Description

technical field [0001] The present invention relates to a description of a double-sided adhesive sheet. Background technique [0002] Optically functional films such as polarizing plates are fixed using members such as liquid crystal cells and double-sided adhesive sheets made of adhesives. In addition, such a double-sided adhesive sheet is produced, for example, by applying an adhesive to a first release film to form an adhesive layer, and then laminating a second release film on the formed adhesive layer. Moreover, the double-sided adhesive sheet produced in this way is generally wound up in a roll shape and stored and transported. [0003] In recent years, in order to improve production efficiency, the winding length of such a double-sided adhesive sheet wound into a roll has gradually increased. In addition, for optical functional film applications, there are many low-elastic-modulus adhesives that focus on light leakage resistance and printing step tracking, and adhes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/10C09J7/30C09J133/06B32B27/00
CPCC09J133/06C09J2203/326B32B7/06B32B7/12B32B27/08B32B27/308B32B27/36B32B2307/748B32B2405/00B32B2457/00C09J7/403C09J7/10C09J2301/1242C09J2301/312
Inventor 黑川敦史加茂雅康
Owner LINTEC CORP