JP-2025533325-A5 -

Dates

Publication Date

20260507

Application Date

20230424

Description

A further subject of the present invention is an article obtained using the hot-melt pressure-sensitive adhesive composition of the present invention. The article comprises a first substrate and a second substrate bonded together with the adhesive composition of the present invention. In one preferred embodiment, the article is selected from the group consisting of a polymer foil substrate, a polymer substrate, a metal substrate, a glass substrate, or a wood substrate or a paper substrate. The initial disclosures of this specification include at least the following aspects: [1] a. Acrylic epoxy copolymer; b. At least one sulfonium salt-based photoinitiator, and c. At least one thioxanthone-based photosensitizer A UV-LED curable hot melt pressure-sensitive adhesive composition containing [the specified ingredient]. [2] The adhesive composition according to [1], characterized in that the acrylic-epoxy copolymer is prepared from a monomer acrylic mixture copolymerized with an alicyclic epoxide. [3] Acrylic mixtures have a general structure (I): [In the formula, R1 is C1-C18 alkyl or H, R2 is either H or CH3 , R 3 is either H or CH 3 . n is an integer between 0 and 18. The adhesive composition according to [2], characterized by comprising at least one aliphatic acrylic monomer. [4] The adhesive composition according to [3], characterized in that the monomer acrylic mixture comprises at least one acrylate selected from the group consisting of methyl acrylate, ethyl acrylate, and isobutyl acrylate, and at least one acrylic monomer selected from the group consisting of 2-ethylhexyl acrylate, n-butyl acrylate, 2-propylheptyl acrylate, and isodecyl acrylate. [5] General structure (III): [In the formula, R1 is a C1-C18 alkyl group or H. R2 is a C1-C18 alkyl or C1-C18 alkoxy , R3 is an alicyclic epoxy or epoxy group . The adhesive composition according to any one of [2] to [4], characterized in that epoxy acrylic monomers are copolymerized. [6] The acrylic-epoxy copolymer is preferably obtained by solution polymerization in a solvent selected from the group consisting of ethyl acetate, butanone, heptane, hexane, pentanone, acetone, toluene, propyl acetate, benzene, and mixtures thereof, as described in any of [2] to [5]. [7] At least one sulfonium salt photoinitiator is defined by general formula (III): [In the formula, R1 is selected from H, aryl, thioaryl, C1-C18 alkyl, C1-C18 alkoxy, SH, or NR2 . R2 is selected from P, Sb, B, As, or Bi . R 3 is F 6- or F 3 (C 2 F 5 ) 3- . An adhesive composition according to any one of [1] to [6], characterized by being represented by [1]. [8] At least one thioxanthone photosensitizer is of general formula (IV): [In the formula, R1 is NH, CH2 , S, or O. R2 to R9 are independently H, C1-C18 alkyl or isoalkyl, C1-C18 alkoxy, aryl, COOH, OH, NR2 , COOR, urea, urethane, S , or SH. An adhesive composition according to any one of [1] to [7], characterized by being represented by [1]. [9] The adhesive composition according to any one of [1] to [8], wherein the application temperature of the adhesive composition is 60 to 150°C, preferably 100 to 130°C, and more preferably 110 to 120°C. [10] The adhesive composition according to any one of [1] to [9], characterized in that it can be cured at a UVA dose of 100 to 10,000 mJ/cm², preferably 300 to 3,000 mJ/cm², as measured by UV radiation measurement Puk measurement ( here , EIT Power Puk II). [11] The adhesive composition according to any one of [1] to [10], characterized in that the cured adhesive has a shear adhesion failure temperature (SAFT) of 50 to 200°C, preferably 120 to 200°C, as measured according to GTF 6001 (Afera 5013). [12] The adhesive composition according to any one of [1] to [11], characterized in that the cured adhesive exhibits a performance of 2 to 45 N/25 mm, preferably 5 to 35 N/25 mm, at 300 mm/min in a 180° peel on a steel substrate as measured in accordance with DIN ES ISO 11339/2010-06. [13] A method for producing an adhesive composition according to any one of [1] to [12], comprising copolymerizing an acrylic monomer mixture with an alicyclic epoxide, and blending the resulting acrylic-epoxy-polymer with at least one sulfonium salt-based photoinitiator and at least one thioxanthone-based photosensitizer to obtain an adhesive composition. [14] The method according to [13], wherein the copolymerization is carried out in a solvent selected from the group consisting of ethyl acetate, butanone, heptane, hexane, pentanone, acetone, toluene, propyl acetate, benzene, and mixtures thereof. An article comprising a first substrate and a second substrate bonded together with an adhesive composition according to any one of [1] to [12].