In this study, optically clear adhesives (OCAs) with an acid-free formulation were synthesized by replacing acrylic acid with N-vinyl pyrrolidone (NVP) to prevent display corrosion, and used to evaluate various adhesive properties, including peel strength, transmittance and corrosion properties, with adjustments made to the NVP content. The synthesized OCAs, characterized by GPC, conversion, and viscosity, exhibited decreased molecular weights with increasing NVP contents, due to the increased their hydrophobicity. In addition, the synthesized OCAs exhibited an increase in peel strength with higher NVP contents, while maintaining good visible light transmittance regardless of the NVP content, and exhibited a significantly reduced copper foil corrosion effect compared to PSA containing acrylic acid.

본 연구에서는 디스플레이의 부식을 방지하기 위해 기존 점착제에서 주로 사용하는 acrylic acid를 N-vinyl pyrrolidone(NVP)로 대체하고 함량 조절을 통해 점착필름의 박리강도, 투과율과 부식 특성평가 등과 같은 특성을 평가하였다. 합성된 아크릴 prepolymer의 GPC, 전환율, 점도를 측정하였고 NVP 함량이 증가함에 따라 소수성의 증가로 분자량이 낮아짐을 확인하였다. 또한 NVP 함량이 증가할수록 박리강도는 증가하였으며, NVP 함량에 관계 없이 우수한 가시광선 투과도를 나타내었다. 합성된 acid-free optically clear adhesive(OCA)는 acrylic acid 함유 점착필름에 비해 현저히 낮은 동박부식 효과를 나타내었다.

Keywords: pressure sensitive adhesive, N-vinyl pyrrolidone, UV-curing, optically clear adhesives.