US-20260125583-A1 - ADHESIVE WITH PRESSURE REGULATION FUNCTION

Abstract

An adhesive with a pressure regulation function of the present invention is the adhesive configured to be adhered to a resin adherend including a vapor release port in order to seal the vapor release port. Adhesive strength reduces by heat of vapor released from the vapor release port, and peeling occurs to release vapor by pressure of vapor. The adhesive is capable of resealing the vapor release port after vapor release, and no external force may be required for resealing. The adhesive may include a pressure sensitive adhesive, and a side chain crystalline polymer including, as a monomer component, (meth)acrylate having a straight-chain alkyl group with a carbon number of 12 to 30.

Inventors

• Takumi Kato
• Keisuke Sako

Assignees

• NITTA CORPORATION

Dates

Publication Date

20260507

Application Date

20231006

Priority Date

20221014

Claims (6)

1. 1 . An adhesive with a pressure regulation function configured to be adhered to a resin adherend comprising a vapor release port in order to seal the vapor release port, wherein adhesive strength reduces by heat of vapor released from the vapor release port, and peeling occurs to release vapor by pressure of vapor.
2. 2 . The adhesive with the vapor release function according to claim 1 , wherein the vapor release port is resealable after vapor release, and no external force is required for resealing.
3. 3 . The adhesive with the vapor release function according to claim 1 , wherein the adhesive comprises a pressure sensitive adhesive, and a side chain crystalline polymer comprising, as a monomer component, (meth)acrylate having a straight-chain alkyl group with a carbon number of 12 to 30.
4. 4 . The adhesive with the vapor release function according to claim 3 , wherein adhesive strength to a resin reduces at a temperature not lower than a melting point of the side chain crystalline polymer.
5. 5 . An adhesive sheet with a pressure regulation function, comprising the adhesive with the pressure regulation function according to claim 1 .
6. 6 . An adhesive tape with a pressure regulation function, comprising: a base having a film shape; and an adhesive layer that is laminated on at least one surface of the base and comprises the adhesive with the pressure regulation function according to claim 1 .

Description

TECHNICAL FIELD The present invention relates to an adhesive with a pressure regulation function. BACKGROUND When a closed container is heated, the container may expand and burst due to water vapor generated along with warming. With respect to this problem, many technologies have been proposed which are configured to add a vapor discharge function by putting a lot of thought into a lid and an adhesive tape of the container. For example, Patent Document 1 proposes a configuration where a heat shrinkable film is applied, and the film shrinks to discharge vapor during heating. However, with a conventional configuration as proposed in Patent Document 1, a vapor discharge port remains open after discharging the vapor. Hence, there have been possibilities of a leak of a content and a burn injury by discharge of remaining vapor. There have also been concerns that a foreign matter enters the inside, etc. In order to improve the above problems, for example, Patent Document 2 proposes a configuration where an adhesive label peels off by a vapor internal pressure, and resealing is supported by rigidity of a base material. However, the configuration proposed by Patent Document 2 requires an operation (external force), such as affixing by hand when resealing. Consequently, there remains a concern about a burn injury when resealing, due to heat of vapor slightly released even after heating. RELATED ART DOCUMENTS Patent Documents Patent Document 1: Japanese Unexamined Patent Publication No. 2016-60531Patent Document 2: Japanese Patent No. 6771281 SUMMARY OF THE INVENTION Problems to be Solved by the Invention It is an object of the present invention to provide an adhesive with a pressure regulation function which is excellent in sealing properties and vapor releasability. Means for Solving the Problem An adhesive with a pressure regulation function of the present invention is the adhesive configured to be adhered to a resin adherend including a vapor release port in order to seal the vapor release port. Adhesive strength reduces by heat of vapor released from the vapor release port, and peeling occurs to release vapor by pressure of vapor. Effects of the Invention With the present invention, there are the effects of being excellent in sealing properties and vapor releasability. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an adhesive with a pressure regulation function (an adhesive tape with a pressure regulation function) according to an embodiment of the present invention, and an adherend, specifically illustrating a state before vapor release; FIG. 2 is a sectional view of an adhesive with a pressure regulation function (an adhesive tape with a pressure regulation function) according to an embodiment of the present invention, and an adherend, specifically illustrating a state where pressure increases by vapor generation; FIG. 3 is a sectional view of an adhesive with a pressure regulation function (an adhesive tape with a pressure regulation function) according to an embodiment of the present invention, and an adherend, specifically illustrating a state of vapor release; FIG. 4 is a sectional view of an adhesive with a pressure regulation function (an adhesive tape with a pressure regulation function) according to an embodiment of the present invention, and an adherend, specifically illustrating a state after vapor release; FIG. 5 is a graph that shows a water vapor pressure curve with respect to temperature; and FIG. 6 is a graph that shows a water vapor pressure curve and shows how adhesive strength of adhesive of each of Example 5 and Comparative Example 1 varies with temperature. EMBODIMENTS An adhesive with a pressure regulation function (hereinafter referred to simply as “an adhesive” in some cases) according to an embodiment of the present invention is described in detail below with reference to the drawings by exemplifying the case of being used in the form of an adhesive tape. As illustrated in FIG. 1, an adhesive tape with a pressure regulation function (hereinafter referred to simply as “an adhesive tape” in some cases) 1 in the present embodiment includes a base 2 having a film shape, and an adhesive layer 3 laminated on at least one surface of the base 2. The adhesive layer 3 includes an adhesive with the pressure regulation function 4 of the present embodiment. The adhesive layer 3 includes the adhesive 4 as a main component. The term “main component” as used herein is a component whose content in terms of weight ratio is higher than any other components. The main component may be, for example, 80% by weight or more. A content of the adhesive 4 in the adhesive layer 3 may be 80-100% by weight. The adhesive 4 of the present embodiment is adhered to a resin adherend 100 including a vapor release port 101 in order to seal the vapor release port 101. The phrase “seal the vapor release port 101” as used herein is a concept that means not only sealing the vapor release port 101 before vapor r