US-12617178-B2 - Water-stop film

Abstract

Provided is a water-stop film including, in the following order, a water-permeable substrate, a water-absorbent polymer-containing layer, and a pressure-sensitive adhesive layer, in which the water-absorbent polymer-containing layer has a cross-sectional shape in which at least a part of the water-absorbent polymer-containing layer protrudes in a direction away from the water-permeable substrate.

Inventors

• Kyohisa Uchiumi
• Ren Ishikawa

Assignees

• FUJIFILM CORPORATION

Dates

Publication Date

20260505

Application Date

20250219

Priority Date

20220826

Claims (8)

1. 1 . A water-stop film comprising, in the following order: a water-permeable substrate; a water-absorbent polymer-containing layer; and a pressure-sensitive adhesive layer, wherein the water-absorbent polymer-containing layer has a cross-sectional shape in which at least a part of the water-absorbent polymer-containing layer protrudes in a direction away from the water-permeable substrate.
2. 2 . The water-stop film according to claim 1 , wherein the water-absorbent polymer-containing layer includes, in the following order, a first water-absorbent polymer-containing layer having a flat shape, on a surface of the water-permeable substrate, and a second water-absorbent polymer-containing layer having a convex cross-sectional shape, on a surface of the first water-absorbent polymer-containing layer.
3. 3 . The water-stop film according to claim 2 , wherein an expansion rate of the second water-absorbent polymer-containing layer is higher than an expansion rate of the first water-absorbent polymer-containing layer.
4. 4 . The water-stop film according to claim 3 , wherein the expansion rate of the second water-absorbent polymer-containing layer is 1.5 times to 5 times the expansion rate of the first water-absorbent polymer-containing layer.
5. 5 . The water-stop film according to claim 1 , wherein the cross-sectional shape of the water-absorbent polymer-containing layer is a tapered shape in which a width decreases in the direction away from the water-permeable substrate.
6. 6 . The water-stop film according to claim 1 , wherein an elongation rate of the water-permeable substrate is 100% to 300%.
7. 7 . The water-stop film according to claim 1 , wherein a basis weight of the water-permeable substrate is 100 g/m 2 to 200 g/m 2 .
8. 8 . The water-stop film according to claim 1 , wherein the water-permeable substrate is a nonwoven fabric, a cloth, or a paper.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a Continuation of International Application No. PCT/JP2023/030520, filed Aug. 24, 2023, which claims priority to Japanese Patent Application No. 2022-135048 filed Aug. 26, 2022. Each of the above applications is hereby expressly incorporated by reference, in its entirety, into the present application. BACKGROUND OF THE INVENTION 1. Field of the Invention The present disclosure relates to a water-stop film. 2. Description of the Related Art In order to reduce damage caused by water infiltration or water leakage, various water stop technologies have been studied. For example, JP1992-8610B (JP-H4-8610B) discloses a waterproofing device in which a gap of a concrete cast joint of a concrete structure is waterproofed by bonding a waterproofing device consisting of a long synthetic resin tape and a support polymerized thereto, and an adhesive layer is provided on a surface of the synthetic resin tape and bonded to a surface of the concrete cast joint, in which the support is formed of a long synthetic resin foaming material having a trapezoidal cross section, a triangular cross section, or the like, which has a bottom side and two oblique sides, and a nonwoven fabric waterproof tape wider than the bottom side is polymerized on a surface serving as the bottom side. SUMMARY OF THE INVENTION As the water stop technology, a method of covering an inlet of water or an outlet of water with a water-stop film has been studied. For example, most of inundation damage of a building occurs due to infiltration of water into the building through a gap of an object such as a window and a door. In order to prevent or reduce the inundation damage as described above, it is considered that covering the gap of the object such as a window and a door with the water-stop film is effective. In construction using the water-stop film, durability is required. The present disclosure has been made in view of such circumstances, and an object of one embodiment of the present invention is to provide a water-stop film having excellent durability. The present disclosure includes the following aspects. <1> A water-stop film comprising, in the following order: a water-permeable substrate;a water-absorbent polymer-containing layer; anda pressure-sensitive adhesive layer,in which the water-absorbent polymer-containing layer has a cross-sectional shape in which at least a part of the water-absorbent polymer-containing layer protrudes in a direction away from the water-permeable substrate. <2> The water-stop film according to <1>, in which the water-absorbent polymer-containing layer includes, in the following order, a first water-absorbent polymer-containing layer having a flat shape, on a surface of the water-permeable substrate, anda second water-absorbent polymer-containing layer having a convex cross-sectional shape, on a surface of the first water-absorbent polymer-containing layer. <3> The water-stop film according to <2>, in which an expansion rate of the second water-absorbent polymer-containing layer is higher than an expansion rate of the first water-absorbent polymer-containing layer. <4> The water-stop film according to <3>, in which the expansion rate of the second water-absorbent polymer-containing layer is 1.5 times to 5 times the expansion rate of the first water-absorbent polymer-containing layer. <5> The water-stop film according to any one of <1> to <4>, in which the cross-sectional shape of the water-absorbent polymer-containing layer is a tapered shape in which a width decreases in the direction away from the water-permeable substrate. <6> The water-stop film according to any one of <1> to <5>, in which an elongation rate of the water-permeable substrate is 100% to 300%. <7> The water-stop film according to any one of <1> to <6>, in which a basis weight of the water-permeable substrate is 100 g/m2 to 200 g/m2. <8> The water-stop film according to any one of <1> to <7>, in which the water-permeable substrate is a nonwoven fabric, a cloth, or a paper. According to the present disclosure, a water-stop film having excellent durability is provided. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing a configuration of a water-stop film according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view taken along a line A-A in FIG. 1. FIG. 3A is a schematic cross-sectional view showing a configuration of Modification example 1 of the water-stop film. FIG. 3B is a schematic cross-sectional view showing a configuration of Modification example 2 of the water-stop film. FIG. 3C is a schematic cross-sectional view showing a configuration of Modification example 3 of the water-stop film. FIG. 3D is a schematic cross-sectional view showing a configuration of Modification example 4 of the water-stop film. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the water-stop film according to the present disclosure will be de