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Adhesive tape

A technology of adhesive tape and adhesive layer, applied in the direction of adhesive, film/sheet adhesive, coating, etc., can solve the problems of easy wrinkling, warping, thinning of adhesive tape, etc., to achieve Excellent unevenness followability

Pending Publication Date: 2022-07-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The thickness of the bent and stretched parts of the adhesive tape varies greatly, and in this state, it is easy to wrinkle or warp
For example, when the pressure-sensitive adhesive tape is stretched, the thickness of the pressure-sensitive adhesive tape is greatly reduced, and it is easy to cause warping from the adherend.
[0007] As mentioned above, conventional pressure-sensitive adhesive tapes cannot sufficiently follow unevenness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0207] Into a reaction vessel equipped with a stirrer, a thermometer, a nitrogen introduction pipe, and a condenser, as monomer components, 2-ethylhexyl acrylate (2EHA): 30 parts, n-butyl acrylate (BA): 70 parts, acrylic acid ( AA): 2 parts, and 4-hydroxybutyl acrylate (4HBA): 0.1 part, 2,2'-azobisisobutyronitrile (AIBN) as a polymerization initiator: 0.08 part, and toluene as a polymerization solvent: 150 parts were solution-polymerized at 65 degreeC for 8 hours, and the toluene solution of an acrylic polymer (A) was obtained. The weight average molecular weight of this acrylic polymer (A) was 440,000.

[0208] With respect to 100 parts of acrylic polymer (A) contained in the above-mentioned toluene solution, tackifier resin TA (manufactured by Harima Chemical Co., Ltd., hydrogenated rosin glyceride, trade name "HARITACK SE10", softening point: 75°C was added ~85°C): 30 parts, and an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "CORONATE...

Embodiment 2

[0213] Except having changed the usage-amount of the isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name: "CORONATE L") to 1.8 parts, it was carried out in the same manner as the preparation of the adhesive composition (A) in Example 1, Thereby, the adhesive composition (B) was prepared.

[0214] Two commercially available release liners (manufactured by Sumika Paper Co., Ltd., trade name "SLB-80WD (#1300)" (double-sided release liner with release-treated layer) were prepared. The said adhesive composition (B) was apply|coated on one surface (release surface) of each release liner so that the thickness after drying might be 20 micrometers, and it dried at 100 degreeC for 5 minutes. As a result, a 20-μm-thick pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) composed of the acrylic pressure-sensitive adhesive (B) corresponding to the pressure-sensitive adhesive composition (B) was formed on the release surfaces of the abo...

Embodiment 3

[0218] It carried out similarly to Example 1, and produced the adhesive composition (A).

[0219] Two commercially available release liners (manufactured by Sumika Paper Co., Ltd., trade name "SLB-80WD (#1300)" (double-sided release liner with release-treated layer) were prepared. The said adhesive composition (A) was apply|coated on one surface (release surface) of each release liner so that the thickness after drying might be 10 micrometers, and it dried at 100 degreeC for 5 minutes. As a result, a 10-μm-thick pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer (first) composed of the acrylic pressure-sensitive adhesive (A) corresponding to the pressure-sensitive adhesive composition (A) was formed on the release surfaces of the above-mentioned two release liners, respectively. adhesive layer and second adhesive layer).

[0220] An ether-type urethane resin film (B) (100% modulus=5.6 MPa) having a thickness of 30 μm was prepared as a base material lay...

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Abstract

The invention provides an adhesive tape with excellent concave-convex followability. The adhesive tape according to the present invention has an adhesive layer on at least one side of a substrate layer, and the adhesive tape has a dimensional change rate of-0.39 to-0.20 at 23 DEG C and 50% RH. Wherein the dimensional change rate of the adhesive tape at 23 DEG C and 50% RH is obtained by cutting the adhesive tape into a strip having a width of 20 mm to produce a sample for measurement, using a tensile testing machine, setting the initial inter-chuck distance to 20 mm, and setting the initial inter-chuck distance to 20 mm. The sample for measurement is stretched in the longitudinal direction at a stretching speed of 300 mm / min in an environment of 23 DEG C and 50% RH so that the amount of deformation reaches 100%, and the dimensional change rate is calculated according to a prescribed formula.

Description

technical field [0001] The present invention relates to adhesive tapes. Background technique [0002] Adhesive tapes are used for fixing structures of various shapes (for example, Patent Documents 1 to 3). However, when an adhesive tape is attached to a corner (for example, a corner of a wall) or a curved portion (for example, a movable curved portion of a folded member, etc.), stress is generated in the adhesive tape, and it cannot be fully realized The unevenness of the adhesive tape follows. [0003] When an adhesive tape is stuck to a corner part or a curved part, the following problems arise specifically. [0004] When the pressure-sensitive adhesive tape is bent at a certain angle, a force that compresses the pressure-sensitive adhesive tape acts on the inner diameter side of the curve, and the pressure-sensitive adhesive tape itself is deformed in order to relax the force. Specifically, for example, it is easy to wrinkle. [0005] When the adhesive tape is bent at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/38C09J201/00C09J7/29
CPCC09J201/00C09J7/38C09J2301/312C09J2475/006C09J2433/00C09J7/25C09D5/00C09J7/29C09J7/385C09J2301/124C09J2301/162C09J2301/302
Inventor 山成悠介斋藤诚樋口真觉家田博基
Owner NITTO DENKO CORP
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