KR-20260066174-A - Tape including a curable adhesive film and related adhesive system and method

Abstract

The tape comprises a polymer blend comprising a (meth)acrylate copolymer and a nitrogen-containing polymer, an unsaturated free-radical polymerizable group that may be bonded to the (meth)acrylate copolymer or present in a species other than the (meth)acrylate copolymer, and a curable adhesive film comprising a transition metal cation. The (meth)acrylate copolymer comprises acidic monomer units. The adhesive system comprises the tape and an activator composition comprising an oxidizing agent. A method for bonding a first substrate comprises the steps of applying the activator composition onto a surface of the first substrate and bringing the activator composition into contact with a first surface of the tape. The activator composition comprises an oxidizing agent.

Inventors

• 랭 니콜라스 더블유.
• 쿠겔 알렉산더 제이.
• 라이 쯔위
• 마이너 딘 에이.
• 홀브룩 매튜 티.
• 사트리조 앤드류

Assignees

• 쓰리엠 이노베이티브 프로퍼티즈 컴파니

Dates

Publication Date

20260512

Application Date

20241018

Priority Date

20231020

Claims (15)

1. As a tape, The above tape includes a curable adhesive film, and the curable adhesive film is A polymer blend comprising a (meth)acrylate copolymer and a nitrogen-containing polymer, wherein the (meth)acrylate copolymer comprises acidic monomer units; An unsaturated free-radical polymerizable group that can be bonded to the (meth)acrylate copolymer or may be present in a species other than the (meth)acrylate copolymer; and Transition metal cations Tape containing
2. In claim 1, the tape, wherein the curable adhesive film further comprises a quaternary ammonium salt.
3. A tape according to claim 1 or 2, wherein the nitrogen-containing polymer comprises at least one of an amino functional group or an amido functional group.
4. A tape according to any one of claims 1 to 3, wherein the nitrogen-containing polymer comprises at least one of a nitrogen-containing (meth)acrylate copolymer, a nitrogen-containing (meth)acrylate block copolymer, a polyvinylpyrrolidone polymer, or a polyvinylpyrrolidone copolymer.
5. A tape according to any one of claims 1 to 4, wherein the unsaturated free-radical polymerizable group is in a species other than the (meth)acrylate copolymer, and said species is a crosslinking monomer.
6. A tape according to any one of claims 1 to 5, wherein the nitrogen-containing polymer is present in an amount of 1 weight% or more, 40 weight% or less, or in the range of 1 weight% to 40 weight% based on the total weight of the curable adhesive film.
7. A tape comprising a foam support layer in any one of claims 1 to 6.
8. A tape according to any one of claims 1 to 6, wherein the curable adhesive film is a foam adhesive.
9. A tape according to any one of claims 1 to 6, wherein the curable adhesive film comprises a foam support layer, a first adhesive layer on a first surface of the foam support layer, and a second adhesive layer on a second surface of the foam support layer opposite to the first adhesive layer, and at least one of the first adhesive layer, the second adhesive layer, or the foam support layer independently comprises the polymer blend, the unsaturated free-radical polymerizable group, and the transition metal cation.
10. As an adhesive system, A tape according to any one of paragraphs 1 through 9; and Activator composition containing an oxidizing agent An adhesive system including
11. In claim 10, the adhesive system wherein the activator composition is a liquid at room temperature and pressure.
12. An adhesive system according to claim 10, wherein the activator composition is a solid at room temperature and pressure, and the solid is in the form of a film, crayon, or paste.
13. An adhesive system according to any one of claims 10 to 12, wherein the activator composition does not include an unsaturated free-radical polymerizable group.
14. As a method for bonding a first substrate, A step of applying an activator composition containing an oxidizing agent onto the surface of the first substrate; and A step of contacting the above activator composition with the first surface of the tape of any one of claims 1 to 9. A method including
15. A method according to claim 14, further comprising the step of bonding the second surface of the tape to a second substrate, or further comprising the step of covering the second surface of the tape with an oxygen-permeable liner.

Description

Tape including a curable adhesive film and related adhesive system and method Cross-reference with related applications This application claims priority to U.S. Provisional Application No. 63/545058 filed on October 20, 2023, the disclosures of which are incorporated herein by reference in their entirety. U.S. Patent Application Publications No. 2020/0362204, No. 2021/0102095, and No. 2021/0102097 by Ranade et al., respectively, describe an adhesive system comprising a curable free-standing adhesive film comprising a) a first film-forming polymer or oligomer, b) a first species comprising a first unsaturated free-radical polymerizable group which may be a) or a species other than a), and c) a blend of a first transition metal cation. The curable free-standing adhesive film may be a pressure-sensitive adhesive. The curable free-standing adhesive film may be used with a primer that is liquid at room temperature and pressure and comprises an oxidizing agent. The curable free-standing adhesive film may also comprise d) a reducing agent and may not comprise an oxidizing agent, and e) a second film-forming polymer or oligomer; f) a second species comprising a second unsaturated free-radical polymerizable group, which may be e) or a species other than e); and g) a blend of oxidizing agents, which may be used in combination with a second curable free-standing adhesive film. A method of bonding using such a curable free-standing adhesive film is also described. International Patent Publication WO 2023/111958 (Kugel et al.) describes an adhesive system comprising a tape and an activator. The tape comprises a curable free-standing adhesive film adjacent to a curable foam support layer. U.S. Patent Application Publication No. 2020/0062998 (Schumann et al.) describes a reactive two-component adhesive system in the form of a film with improved heat resistance and moisture resistance. In one aspect, the present invention provides a curable adhesive film comprising a polymer blend comprising a (meth)acrylate copolymer and a nitrogen-containing polymer, an unsaturated free-radical polymerizable group that may be bonded to the (meth)acrylate copolymer or may be present in a species other than the (meth)acrylate copolymer, and a transition metal cation. The (meth)acrylate copolymer comprises acidic monomer units. Typically, and advantageously, the tape exhibits improved bulk creep and static shear performance compared to tapes with the same composition, except for the absence of nitrogen-containing polymers. Consequently, tapes containing nitrogen-containing polymers can possess greater dimensional stability prior to curing. Bulk creep and static shear characteristics are unexpectedly superior to those achieved with non-functional or acid-functional block copolymers, and are unexpectedly superior at lower concentrations than poly(vinyl butyral) additives that can be used to increase modulus. The cured overlap shear strength of the adhesive is not adversely affected by the nitrogen-containing polymer. In another aspect, the present invention provides an adhesive system comprising a tape and an activator composition comprising an oxidizing agent. The adhesive system may be provided as a kit comprising the tape and the activator composition. In another aspect, the present invention provides a method for bonding a first substrate. The method comprises the steps of applying an activator composition onto a surface of the first substrate and bringing the activator composition into contact with a first surface of a tape. The activator composition comprises an oxidizing agent. The term "polymer" refers to a molecule having a structure comprising a number of repeating units derived from one or more monomers, either in practice or conceptually. The term "monomer" refers to a molecule of low relative molecular weight that can form a polymer by combining with other monomers. The term "polymer" includes homopolymers and copolymers, as well as homopolymers or copolymers that can be formed into miscible blends, for example, by co-extrusion or by reaction. The term "polymer" includes random, block, graft, and star polymers. The term "polymer" includes oligomers. As used herein, the term “nitrogen-containing polymer” means that the polymer contains at least one nitrogen atom in at least one repeating unit. Accordingly, such elements may also be referred to as “nitrogen atom-containing polymers.” A "monomer unit" of a polymer or oligomer is a segment of the polymer or oligomer derived from a single monomer. For example, the monomer unit of acrylic acid ( H₂C =CH-(C=O)-OH) is as follows: Here, an asterisk (*) indicates a site of attachment to another group, such as another monomer unit within the polymer. The terms “cured” and “curable” refer to polymer chains being joined together by covalent chemical bonds, usually through crosslinking of molecules or groups, to form a network polymer. Accordingly, in this specification, the terms “cured” and