Double-sided pressure-sensitive adhesive sheet

A technology of pressure-sensitive adhesive sheets and pressure-sensitive adhesives, applied in the direction of pressure-sensitive films/sheets, adhesives, release paper, etc., can solve the problems of poor peeling operability and damage, and achieve excellent peeling operability

Inactive Publication Date: 2013-06-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pull-tab 6 in which a slit is produced is grasped and the release liner 11 is peeled off from the pressure-sensitive adhesive 21, the release liner 11 is torn from the slit 5 and broken, and as Figure 4 As shown, there has been a problem that the release liner 7 with the interlayer tear remains on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive 21 and the peeling workability becomes poor.
In particular, the above-mentioned problems are prone to occur in paper-based substrates

Method used

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  • Double-sided pressure-sensitive adhesive sheet
  • Double-sided pressure-sensitive adhesive sheet
  • Double-sided pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] (Preparation of pressure-sensitive adhesive composition)

[0167] 100 parts by weight of butyl acrylate (BA) and 5 parts by weight of acrylic acid (AA) as a monomer component of an acrylic polymer, 0.2 parts by weight of benzoyl peroxide as a polymerization initiator, and 240 parts by weight of toluene as a polymerization solvent Charge to a collapsible flask and stir for two hours while purging with nitrogen. In this way, after removing oxygen from the polymerization system, the temperature was increased to 62° C., and the resultant was reacted for seven hours to obtain an acrylic polymer solution having a solid content concentration of 30 wt %. The weight-average molecular weight (M) of the acrylic polymer w ) is 550,000.

[0168] As shown in Table 1, 30 parts by weight of a phenol-modified rosin-based resin (trade name: "TAMANOL 803L", Manufactured by Arakawa Chemical Industry, Japan, phenolic hydroxyl value: less than 20 mgKOH / g) and 10 parts by weight of terpene...

Embodiment 2

[0174] As shown in Table 1, a double-sided pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1, except that a heat-curable polysiloxane-based release agent [100 parts by weight of the trade name "AST- 8" (manufactured by Japan Arakawa Chemical Industry Co., Ltd.) and 7.3 parts by weight of a product with the trade name "CATA12070" (manufactured by Bluestar Silicones)] was used as the polysiloxane-based release agent.

Embodiment 3

[0176] As shown in Table 1, a double-sided pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1, except that a heat-curable polysiloxane-based release agent [100 parts by weight of trade name "BY24 -4538" (manufactured by Dow Corning Toray Industries, Ltd.) and 10 parts by weight of a product under the trade name "BY24-490" (manufactured by Dow Corning Toray Industries, Ltd.)] was used as the silicone-based peeling agent agent. Here, the blending amount (parts by weight) of "BY24-4538" and "BY24-490" is the total amount of "BY24-4538" and "BY24-490" themselves (actual products) relative to 100 parts by weight of the acrylic polymer. Mixed amount.

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Abstract

There is provided a double-sided pressure-sensitive adhesive sheet including a pressure-sensitive adhesive body having pressure-sensitive adhesive faces (a) and (b) on both sides thereof, and a release liner (A) provided at least on the pressure-sensitive adhesive face (a) of the pressure-sensitive adhesive body. The release liner (A) includes a paper-based base material and a release layer on a face of the paper-based base material, the release layer being in contact with the pressure-sensitive adhesive face (a). The ratio of an interlayer strength of the release liner (A) with respect to a peeling force of the release liner (A) in a peeling test at 90 DEG with respect to the pressure-sensitive adhesive face (a) is 15 or more. The double-sided pressure-sensitive adhesive sheet may preferably be used as a double-sided pressure-sensitive adhesive sheet for a flexible printed circuit board.

Description

technical field [0001] The present invention relates to double-sided pressure-sensitive adhesive sheets. Background technique [0002] Wiring circuit boards are used in electronic devices, and flexible printed circuit boards (sometimes referred to as "FPC") are widely used as these wiring circuit boards. FPC is generally used in a state where it is fixed to a housing or a reinforcing plate (aluminum plate, stainless steel plate, polyimide plate, etc.) of an electronic device. An adhesive sheet (pressure-sensitive adhesive sheet) is used at the time of fixing (fitting) to the above-mentioned case or reinforcing plate (refer to JP-A-2006-302941). [0003] Having a pull tab (tab for peeling) used as a grip portion when peeling the release liner from the pressure-sensitive adhesive sheet facilitates peeling of the release liner and improves peeling operability, from this point of view , The pressure-sensitive adhesive sheet used when fixing the FPC is sometimes used after the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/10
CPCD21H27/06C09J2483/005C09J7/00C09J2203/326C09J7/045D21H27/001C09J2433/00C09J2400/283D21H27/00C09J2201/622C09J7/0225C09J7/40C09J7/10Y10T428/1476C09J2301/312C09J7/21C09J7/30C09J7/38C09J133/04C09J2301/124
Inventor 堀口计大学纪二野中崇弘古田喜久
Owner NITTO DENKO CORP
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