KR-102962297-B1 - Method for manufacturing foamed adhesive sheets and articles

Abstract

The present disclosure provides a foamed adhesive sheet having a first adhesive layer, a substrate, and a second adhesive layer in that order, wherein the first adhesive layer and the second adhesive layer contain a curable adhesive, and at least one of the first adhesive layer and the second adhesive layer further contains a foaming agent, wherein the tack of the first adhesive layer is 0gf or more and less than 10gf, the tack of the second adhesive layer is 10gf or more and less than 500gf, and the loop stiffness is 50mN/10mm or more.

Inventors

• 하세가와 이즈미
• 시마다 신야
• 호시 겐타로
• 세가와 도시카즈
• 마에다 나오

Assignees

• 다이니폰 인사츠 가부시키가이샤

Dates

Publication Date

20260508

Application Date

20230301

Priority Date

20220301

Claims (12)

1. A foamed adhesive sheet having a first adhesive layer, a substrate, and a second adhesive layer in this order, The first adhesive layer and the second adhesive layer contain a curable adhesive, and At least one of the first adhesive layer and the second adhesive layer further contains a foaming agent, and The tag of the first adhesive layer is 0gf or more and less than 10gf, and The tag of the second adhesive layer is 10gf or more and 500gf or less, and Foamed adhesive sheet with a loop stiffness of 50 mN/10 mm or more.
2. In claim 1, the foamed adhesive sheet wherein the first adhesive layer contains the foaming agent.
3. In paragraph 2, a foamed adhesive sheet in which the first adhesive layer and the second adhesive layer contain the foaming agent.
4. A foamed adhesive sheet having a first adhesive layer, a substrate, a second adhesive layer, and an adhesive layer in this order, The first adhesive layer and the second adhesive layer contain a curable adhesive and a foaming agent, and The above adhesive layer contains a pressure-sensitive adhesive or a curable adhesive, and The tag of the first adhesive layer is 0gf or more and less than 10gf, and The tag of the above adhesive layer is 10gf or higher, and Foamed adhesive sheet with a loop stiffness of 50 mN/10 mm or more.
5. In paragraph 4, a foamed adhesive sheet in which the tag of the second adhesive layer is 0gf or more and less than 10gf.
6. A foamed adhesive sheet according to claim 1, wherein the thickness of the above-described material is thinner than the thickness of the first adhesive layer and the thickness of the second adhesive layer.
7. A foamed adhesive sheet having a first adhesive layer, a substrate, and a second adhesive layer in this order, The composition of the first adhesive layer and the composition of the second adhesive layer are different, The first adhesive layer and the second adhesive layer contain a thermosetting adhesive, At least one of the first adhesive layer and the second adhesive layer further contains a foaming agent, and the radius of curvature of the curl of the foamed adhesive sheet after standing for 15 hours at a temperature of 60°C and a humidity of 10% RH or less is 15 mm or more, and Foamed adhesive sheet with a loop stiffness of 45 mN/10 mm or more.
8. In claim 7, a foamed adhesive sheet in which the first adhesive layer and the second adhesive layer contain the foaming agent.
9. In claim 7, a foamed adhesive sheet having a thickness that is thinner than the thickness of the first adhesive layer and the thickness of the second adhesive layer.
10. A foamed adhesive sheet according to claim 7, wherein the tag of the first adhesive layer is 0gf or more and less than 10gf, and the tag of the second adhesive layer is 10gf or more and 500gf or less.
11. In claim 7, a foamed adhesive sheet having a curl adjusting layer on the side opposite to the substrate of the second adhesive layer.
12. A placement process for placing a foamed adhesive sheet described in any one of claims 1 to 11 between the first member and the second member, and An adhesive process for bonding the first member and the second member by heating and foaming the above-mentioned expandable adhesive sheet to cure it. Method of manufacturing an article having

Description

Method for manufacturing foamed adhesive sheets and articles The present disclosure relates to a foamed adhesive sheet and a method for manufacturing an article using the same. Adhesives used to bond components together are widely used in various fields. For example, adhesives are used to secure one component to a hole or groove in another component. Specifically, in embedded magnet motors, adhesives are used to secure permanent magnets to holes in the core. Liquid adhesives are the mainstream adhesives used for motors. However, liquid adhesives have problems such as coating stains, oozing, and liquid leakage, which complicate the bonding process. Meanwhile, in recent years, it has been proposed to use a sheet adhesive (foamable adhesive sheet) containing a foaming agent instead of a liquid adhesive (see, for example, Patent Document 1). According to the foamable adhesive sheet, the occurrence of problems in the case of the liquid adhesive described above can be suppressed. FIG. 1 is a schematic cross-sectional view illustrating a foamed adhesive sheet according to the present disclosure. FIG. 2 is a schematic plan and cross-sectional view illustrating a loop stiffness measuring instrument. Figure 3 is a schematic diagram illustrating the method for measuring loop stiffness. Figure 4 is a schematic diagram illustrating the method for measuring loop stiffness. FIG. 5 is a schematic cross-sectional view illustrating a foamed adhesive sheet according to the present disclosure. FIG. 6 is a schematic cross-sectional view illustrating a foamed adhesive sheet according to the present disclosure. FIG. 7 is a schematic cross-sectional view illustrating a foamed adhesive sheet according to the present disclosure. FIG. 8 is a process diagram illustrating a method for manufacturing an article in the present disclosure. FIG. 9 is a process diagram illustrating a method of manufacturing an article in the present disclosure. Figure 10 is a schematic diagram explaining the method for measuring the amount of sagging. Figure 11 is a schematic diagram illustrating the method for measuring the radius of curvature of a curl. FIG. 12 is a schematic cross-sectional view illustrating a foamed adhesive sheet according to the present disclosure. FIG. 13 is a schematic cross-sectional view illustrating a foamed adhesive sheet according to the present disclosure. FIG. 14 is a process diagram illustrating a method for manufacturing an article in the present disclosure. Embodiments of the present disclosure are described below with reference to drawings and the like. However, the present disclosure can be implemented in many different forms and is not to be interpreted as being limited to the description of the embodiments exemplified below. Furthermore, in order to make the explanation clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part relative to the actual form, but this is merely an example and does not limit the interpretation of the present disclosure. Additionally, in this specification and each drawing, elements that are the same as those described above with respect to the previously published drawings are given the same reference numerals, and detailed descriptions may be appropriately omitted. In the present specification, when describing an embodiment of placing another member on a certain member, if simply indicated as "on" or "below," unless specifically stated otherwise, it is understood to include both cases: placing another member directly above or below a certain member so as to be in contact with the certain member, and placing another member above or below a certain member with another member interposed therebetween. Furthermore, in the present specification, when describing an embodiment of placing another member on the surface of a certain member, if simply indicated as "on the surface" or "on the surface," unless specifically stated otherwise, it is understood to include both cases: placing another member directly above or below a certain member so as to be in contact with the certain member, and placing another member above or below a certain member with another member interposed therebetween. Additionally, in this specification, the term "sheet" includes a component called "film." Additionally, the term "film" includes a component called "sheet." Hereinafter, the present disclosure is divided into a first embodiment and a second embodiment, and each is described separately. I. First Embodiment First, a foamed adhesive sheet in the first embodiment of the present disclosure and a method for manufacturing an article using the same will be described. A. Foamed adhesive sheet The foamed adhesive sheet in this embodiment has two embodiments. Each embodiment will be described below. a) First embodiment A first embodiment of the foamed adhesive sheet in the present embodiment is a foamed adhesive sheet having a first adhesive layer, a substrate, and a second adhesive layer