The Effect of Crosslinker Type on Adhesion Properties of Transparent Acrylic Pressure Sensitive Adhesives for Optical Applications

Department of Polymer Science & Engineering, Center for Photofunctional Energy Materials, Dankook University, Yongin, Gyeonggi 448-701, Korea(Received June 30, 2014, Revised July 14, 2014, Accepted July 16, 2014) 2-ethylhexyl acrylate (2-EHA), 2-hydroxyethyl acrylate (2-HEA), isobornyl acrylate (IBOA) 3 . 1,6-hexanediol diacrylate (HDDA), poly(ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, 700) semi-IPN (Pressure sensitive adhesives; PSAs) UV- . , , , . 92.5 % (at 550 nm), 1.0 % haze, 0.3 . .ABSTRACTTerpolymer syrups were photopolymerized from 2-ethylhexyl acrylate, 2-hydroxylethyl acrylate and isobornyl acrylate to prepare acrylic pressure sensitive adhesives (PSAs). After polymerization, various crosslinkers as 1,6-hexanediol diacrylate (HDDA), poly (ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, and 700) were added and then UV-irradiated to prepare the semi-IPN type PSAs. Their adhesion performance and storage modulus (G') were strongly dependent on their chemical structure and molecular weight of the crosslinkers. Optical properties such as transmittance (> 92.5 %), haze (< 1.0 %) and color-difference (< 0.3) of PSAs samples were not affected by crosslinker types used in this study.Keywordspressure sensitive adhesives, crosslinker, semi-IPN, UV-curing, peel strength, transmittance