Transparent acrylic pressure sensitive adhesives (PSAs) were successfully prepared by photopolymerization with 2-ethylhexyl acrylate and 2-hydroxyethyl acrylate as a default constituent and with isobornyl acrylate and biomassderived menthyl acrylate as a variable constituent. The concentration effect of menthyl acrylate in the acrylic PSAs was investigated on adhesion and the optical properties as well as the characteristics (solid content, and molecular weight) of the syrups were also investigated. Regardless of increasing menthyl acrylate concentration in the acrylic PSAs, the acrylic PSAs exhibited almost the same adhesion performance such as 180° peel strength (~3.5 kgf/25 mm) and probe tack (~0.25 kgf). All acrylic PSA samples also showed high transmittance (more than 93%), low haze (less than 1.0%) and low color-difference (less than 1.0).

본 연구는 2-ethylhexyl acrylate와 2-hydroxyethyl acrylate 기본 조성물에 천연물질인 menthol로부터 합성한 menthyl acrylate(MnA)와 석유화학 기반 isobornyl acrylate(IBOA)의 조성비를 변화시키면서 광중합된 공중합체를 이용하여 자외선 경화형 투명 감압성 점착제를 제조하였다. 시럽의 기본 물성인 고형분 및 분자량 분석뿐만 아니라 제조된 감압성 점착제의 점착특성과 광학특성을 고찰하였다. 모든 아크릴 감압성 점착제는 약 3.5 kgf/25 mm의 180° 박리력과 약 0.25 kgf의 초기점착력을 IBOA와 MnA 조성비에 상관없이 거의 유지하였다. 또한 모든 아크릴 감압성점착제에서 93% 이상의 광투과도와 1.0% 이하의 haze 값, 그리고 1.0 이하의 색차값을 보여주었다.

Keywords: pressure sensitive adhesive; menthyl acrylate; photopolymerization; UV-curing; biomass