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Pressure-sensitive adhesive tape

A pressure-sensitive adhesive, pressure-sensitive adhesive technology, applied in the direction of adhesive type, pressure-sensitive film/sheet, ester copolymer adhesive, etc., can solve problems such as tearing and adhesion reduction

Pending Publication Date: 2021-06-22
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the cell portion of the foam occupies most of the bonding portion between the sheet and the adherend, thereby reducing the adhesiveness therebetween.
However, the prior art double-sided pressure-sensitive adhesive sheets cause problems such as tearing during reprocessing, and double-sided pressure-sensitive adhesive sheets to be used for mobile devices have been required to have excellent reworkability

Method used

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  • Pressure-sensitive adhesive tape
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0157] Now, the present invention will be specifically described by way of examples. However, the present invention is by no means limited to the Examples. Tests and evaluation methods in Examples and the like are as follows. Unless otherwise specified, the term "part" in the following description means "weight part", and unless otherwise specified, the term "%" in the following description means "wt%".

[0158]

[0159] The weight-average molecular weight is determined from a value in terms of standard polystyrene obtained by gel permeation chromatography (GPC). An apparatus available under the model number "HLC-8320GPC" (column: TSKgel GMH-H(S), manufactured by Tosoh Corporation) was used as the GPC apparatus.

[0160]

[0161] The double-sided pressure-sensitive adhesive tapes obtained in each of Examples and Comparative Examples were cut into a size of 10 mm wide by 50 mm long to manufacture test pieces. The test piece was pulled up and down in each vertical directi...

manufacture example 1

[0172] [Manufacture Example 1]: Manufacture of pressure-sensitive adhesive layer (1)

[0173] 95 parts of butyl acrylate (BA) and 5 parts of acrylic acid (AA) as monomer components, and 233 parts of ethyl acetate as a polymerization solvent were charged into a device including a stirrer, a thermometer, a nitrogen gas introduction tube, a reflux condenser, and a dropping liquid funneled reaction vessel and stirred for 2 hours while introducing nitrogen gas into the vessel. After the oxygen in the polymerization system has been removed as described above, 0.2 parts of 2,2′-azobisisobutyronitrile is added to the mixture as a polymerization initiator, and the whole is subjected to solution polymerization at 60° C. for 8 hours, thereby A solution of an acrylic polymer is provided. The weight average molecular weight of the acrylic polymer was 700,000.

[0174] With respect to 100 parts of the acrylic polymer in the obtained acrylic polymer solution, 20 parts of terpene-phenol res...

manufacture example 2

[0176] [Manufacture Example 2]: Manufacture of pressure-sensitive adhesive layer (2)

[0177] A pressure-sensitive adhesive layer ( 2 ) having a thickness of 80.0 μm was formed in the same manner as in Production Example 1 except that the thickness of the final pressure-sensitive adhesive layer was set to 80.0 μm.

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Abstract

Provided is a double-sided pressure-sensitive adhesive tape that can express both of excellent impact resistance and excellent rework-ability. The pressure-sensitive adhesive tape includes: a base material layer; and a pressure-sensitive adhesive layer arranged on at least one side of the base material layer, wherein the base material layer has a specific gravity of 0.8 g / cm3 or more, and the pressure-sensitive adhesive tape has a 100% modulus at 23 DEG C. and 50% RH of 50 MPa or less.

Description

technical field [0001] The present invention relates to pressure sensitive adhesive tapes. Background technique [0002] In recent years, along with the diversification of various performances of mobile devices, the diversification of various performances of various constituent members employed in mobile devices has been demanded. In mobile devices, double-sided pressure-sensitive adhesive tapes are sometimes used for joining cases and the like. In recent years, the diversification of various properties of double-sided pressure-sensitive adhesive tapes has also been demanded. [0003] There is a risk that the mobile device will fall depending on the form in which it is used. Therefore, mobile devices having high impact resistance have been demanded. A shock absorbing member is sometimes arranged outside a case of a mobile device for improving the shock resistance of the mobile device. However, in such a form, the size of the mobile device may increase or its design may b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/38C09J7/24C09J7/25C09J133/08
CPCC09J7/385C09J7/24C09J7/25C09J133/064C09J2433/00C09J2423/006C09J2475/006C09J7/22C09J2203/326C09J2301/302C09J2301/312C09J2423/046C09J2467/005
Inventor 丹羽理仁藤田卓也住田启迪
Owner NITTO DENKO CORP