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Adhesive tape

A technology of adhesive tape and adhesive layer, which is applied in the field of adhesive tape, can solve the problems of inability to evaluate impact resistance and antistatic property, and achieve the effect of excellent extrusion force and excellent impact resistance

Active Publication Date: 2017-02-15
TERAOKA SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the conventional physical property evaluation methods described in Patent Documents 1 to 4 are not necessarily suitable for direct application to ultra-narrow adhesive tapes, and cannot evaluate the low-temperature impact resistance of the narrow frame, which is particularly important in ultra-narrow adhesive tapes. property, narrow frame resistance to heat and humidity load, antistatic property, shear deformation rate during heating, extrusion force, processability and other properties cannot be evaluated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1～3

[0056] Add the components (A1)~(A5) of the amount (%) shown in Table 1 in the reaction device that has stirrer, thermometer, reflux cooler and nitrogen gas introduction pipe, and ethyl acetate, the n-dodecanoate as chain transfer agent Mercaptan and 0.1 part of lauroyl peroxide as a peroxide-based radical polymerization initiator. Nitrogen gas was enclosed in the reaction apparatus, and the polymerization reaction was carried out at 68° C. for 3 hours under nitrogen flow while stirring, and then the polymerization reaction was carried out at 78° C. for 3 hours. Then, after cooling to room temperature, ethyl acetate was added. Thus, an acrylic copolymer (A) with a solid content concentration of 30% was obtained.

[0057] Table 1 shows the weight average molecular weight (Mw) and theoretical Tg of each acrylic copolymer. This weight average molecular weight (Mw) is the value obtained by measuring the molecular weight of the standard polystyrene conversion of an acrylic-type co...

Embodiment 4

[0083] In addition to using a base material composed of a PE-based foam containing 70% EVA (thickness = 0.15mm, tensile modulus = 46.2N / mm 2 , Bending moment = 18gf / cm, expansion ratio = 1.7, density = 590kg / m 3 ) was used as a base material, a double-sided adhesive tape was obtained in the same manner as in Example 1.

Embodiment 5

[0085] In addition to using a base material composed of a PE-based foam containing 70% EVA (thickness = 0.2mm, tensile modulus = 36.6N / mm 2 , Bending moment = 18gf / cm, expansion ratio = 2.9, density = 356kg / m 3 ) was used as a base material, a double-sided adhesive tape was obtained in the same manner as in Example 1.

[0086]

[0087] Except for using a PE-based foam (manufactured by Sekisui Chemical Industry Co., Ltd., trade name VOLARAXL-HT#030012, thickness = 0.2mm, tensile modulus = 21.0N / mm 2 , Bending moment = 3gf / cm, expansion ratio = 3, density = 330kg / m 3 ) was used as a base material, a double-sided adhesive tape was obtained in the same manner as in Example 1.

[0088]

[0089] Except for the use of PE-based foam (manufactured by Sekisui Chemical Industry Co., Ltd., trade name VOLARAXL-H#0180015, thickness = 0.15mm, tensile modulus of elasticity = 23.7N / mm 2 , Bending moment = 7gf / cm, expansion ratio = 1.8, density = 560kg / m 3 ) was used as a base material,...

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Abstract

A pressure-sensitive adhesive tape which comprises a substrate and a pressure-sensitive adhesive layer disposed on one or both surfaces thereof, characterized in that the substrate comprises 30 mass% or more ethylene / vinyl acetate copolymer and has a tensile modulus, as determined in accordance with JIS K7161 2014, of 30 N / mm2 or greater. The pressure-sensitive adhesive tape is excellent in terms of various properties including impact resistance, resistance to static electricity, high-temperature shear deformation, and resistance to pressing.

Description

technical field [0001] The present invention relates to an adhesive tape that is excellent in various properties such as impact resistance, antistatic property, shear deformation rate during heating, and extrusion force, and can be suitably used for electronic devices such as smartphones and tablet terminals. . Background technique [0002] Portable electronic devices such as smartphones and tablet terminals generally have a structure that combines a touch panel and a case that houses a liquid crystal module. Furthermore, for example, an adhesive tape is used to fix the touch panel and the case. [0003] In recent years, thinning and miniaturization of these electronic devices are progressing. Along with this, for example, FPC (Flexible Printed Circuits: flexible printed circuit) is bent more acutely inside the device, forming an internal structure that often exerts strong resilience. In addition, in order to enlarge the display area of ​​a liquid crystal display (LCD), t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/20C09J7/26
CPCC09J2203/326C09J7/20C09J2203/318C09J7/26C09J7/243C09J2423/046C09J2431/006C09J2301/124C09J2301/414C09J7/245C09J2301/122C09J2301/312C09J2203/00C09J201/02
Inventor 土屋靖史丹羽理
Owner TERAOKA SEISAKUSHO
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