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KR-20260062725-A - Ethylene-based adhesive material and manufacturing method thereof

KR20260062725AKR 20260062725 AKR20260062725 AKR 20260062725AKR-20260062725-A

Abstract

One embodiment of the present invention provides an ethylene-based adhesive material and a method for manufacturing the same. The ethylene-based adhesive material according to one embodiment of the present invention has excellent adhesive strength, and the ethylene-based adhesive film can provide a high storage modulus (viscoelasticity) at high temperatures.

Inventors

  • 송호준
  • 강주희

Assignees

  • 한국생산기술연구원

Dates

Publication Date
20260507
Application Date
20241029

Claims (11)

  1. Ethylene-based urethane acrylic adhesive material characterized by being represented by the following chemical formula 1: [Chemical Formula 1] In the above chemical formula 1, R is And, the above n is a real number from 1 to 10.
  2. A step of preparing a mixture by adding a compound represented by the following chemical formula 2 and a compound represented by one selected from the group consisting of chemical formulas 3 to 5 to tetrahydrofuran (THF) and dissolving them; and A method for manufacturing an ethylene-based urethane acrylic adhesive material characterized by including the step of heating the above mixture and adding tri-ethyl aluminum (TEA) to perform a polymerization reaction: [Chemical Formula 2] [Chemical Formula 3] [Chemical Formula 4] [Chemical Formula 5]
  3. In paragraph 1, In the step of performing the above polymerization reaction, An ethylene-based urethane acrylic adhesive material characterized by the heating being performed in a temperature range of 40°C to 80°C.
  4. In an ethylene-based adhesive film comprising a copolymer having -A-repeating units, -B-repeating units, and -C-repeating units as repeating unit components, The above -A-repeating unit is a repeating unit represented by the following chemical formula 6, and The above -B-repeating unit is a repeating unit represented by the following chemical formula 7, and An ethylene-based urethane acrylic adhesive film characterized in that the above -C-repeating unit is a repeating unit represented by the following chemical formula 8: [Chemical Formula 6] [Chemical Formula 7] [Chemical Formula 8] In the above chemical formula 8, the R is , or am.
  5. In paragraph 4, An ethylene-based urethane acrylic adhesive film characterized in that the weight of the copolymer of the -C- repeating unit represented by the above chemical formula 8 is 0.1 wt% to 30 wt% relative to the total weight of the copolymer.
  6. In paragraph 4, An ethylene-based urethane acrylic adhesive film characterized by the molecular weight of the adhesive film being 100,000 (g/mol) to 1,000,000 (g/mol).
  7. In paragraph 4, The above adhesive film is an ethylene-based urethane acrylic adhesive film characterized by having a storage modulus of 1,000 Pa to 1,000,000 Pa at a temperature of -40°C or higher and 100°C or lower.
  8. In paragraph 4, The above adhesive film is an ethylene-based urethane acrylic adhesive film characterized by having a strain (%) of 10 to 1,000.
  9. In paragraph 4, The above adhesive film is an ethylene-based urethane acrylic adhesive film characterized by having a recovery rate (%) of 10 to 99.
  10. A mixing step of forming a mixture by mixing 2-ethylhexyl acrylate (EHA), 2-hydroxyethyl acrylate (HEA), a compound represented by the following chemical formula 1, and a photoinitiator; and A method for manufacturing an ethylene-based urethane acrylic adhesive film, characterized by including a UV irradiation step of irradiating a mixture to which the above-mentioned photoinitiator has been added with ultraviolet light to proceed with a polymerization reaction: [Chemical Formula 1] In the above chemical formula 1, R is , or am.
  11. In Paragraph 10, A method for manufacturing an ethylene-based urethane acrylic adhesive film, characterized in that, in the mixing step above, the compound represented by Chemical Formula 1 is in an amount of 0.1 wt% to 30 wt% or less relative to the total weight of the 2-ethylhexyl acrylate (2-Ethylhexyl acrylate, EHA), 2-hydroxyethyl acrylate (2-Hydroxyethyl acrylate, HEA), and the compound represented by Chemical Formula 1 below:

Description

Ethylene-based adhesive material and manufacturing method thereof The present invention relates to an ethylene-based adhesive material and a method for manufacturing the same, and provides an ethylene-based adhesive film comprising the ethylene-based adhesive material. An optical display device includes display elements such as a window film, a conductive film, and an organic light-emitting diode. In the optical display device, various display elements can be attached by an optical clear adhesive film (OCA). Recently, flexible optical display devices are being developed. Accordingly, adhesive films must have high reliability by preventing peeling or bubble formation under temperature changes or thermal shock at high, room, and low temperatures, and must also have good foldability. An adhesive film can be used to bond a window film and an adherend in an optical display device. In this case, the entire window film and adhesive film may be folded toward the adhesive film or folded toward the window film. When folded toward the window film, the adhesive film is folded in the tensile direction, and when folded toward the adhesive film, the adhesive film is folded in the compression direction. Since recent flexible displays involve folding in both directions, the adhesive film must provide high reliability in both-directional folding. Furthermore, adhesive films must exhibit excellent flexibility at low temperatures and superior resilience and reliability even at high temperatures and/or high humidity. In particular, increasing the low-temperature flexibility of the adhesive film makes it difficult to ensure reliability at high temperatures and/or high humidity. Consequently, there is a demand for adhesive films that simultaneously possess excellent flexibility at low temperatures and superior resilience and reliability even at high temperatures and/or high humidity. Figure 1 is a graph confirming the synthesis of an ethylene-based adhesive material. Figure 2 is a graph showing the viscoelastic properties of an ethylene-based adhesive film. Figure 3 is a graph showing the experimental results confirming the creep of an ethylene-based adhesive film. Figure 4 is a graph showing the recovery power of an ethylene-based adhesive film. Figure 5 is a table comparing the physical and chemical properties of ethylene-based adhesive films. The present invention will be described below with reference to the attached drawings. However, the present invention may be implemented in various different forms and is therefore not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals. Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components. The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, the present invention will be described with reference to the drawings presented in this specification. For reference, the drawings may be partially exaggerated to illustrate the features of the present invention. In such cases, it is preferable to interpret them in light of the entire intent of this specification. As mentioned above, although adhesive films used in flexible or foldable displays must have excellent flexibility at low temperatures and excellent resilience and reliability even at high temperatures and/or high humidity, there was a problem in that it is difficult to ensure reliability at high temperatures and/or high humidity when low-temperature flexibility is increased. Accordingly, one embodiment of the present invention, in order to solve the above problem, An ethylene-based adhesive material according to one embodiment of the present invention is described. An ethylene-based adhesive material according to one embodiment of the present invention is, [Chemical Formula 1] In the above chemical formula 1, R is And, the a