Article
  • A Study on the Electron Beam Crosslinking of Acrylic Pressure Sensitive Adhesives for Polarizer Film
  • Park JJ, Choi HJ, Ko HS, Jeong EH, Youk JH
  • 전자선 조사를 통한 편광필름용 아크릴계 고분자의 가교화 반응에 대한 연구
  • 박정진, 최홍준, 고환순, 정은환, 육지호
Abstract
New pressure sensitive adhesives (PSAs) for polarizer film were prepared by electron beam (e-beam) radiation to acrylic copolymers, and their adhesive properties were investigated. The acrylic copolymers were synthesized by free radical polymerization of n-butylacrylate (BA), 2-hydroxyethyl methacrylate (HEMA), and acrylic acid (AA). The acrylic copolymers were coated on PET release films to a thickness of 25 μm, laminated to polarizer films, and then radiated with e-beam at room temperature. Gel fractions of all the acrylic copolymers after e-beam radiation at 50 kGy were higher than 93%, and their crosslinking densities were increased with increasing the content of HEMA units. PSA prepared by e-beam radiation of acrylic copolymer synthesized with a feed ratio of BA/HEMA/AA = 89.5/10/0.5 (w/w/w) at a dose of 50 kGy exhibited the best adhesion performances in terms of peel strength, creep resistance, durability and reliability, and light leakage. It is expected that the preparation method of PSAs via e-beam irradiation will improve the producibility and workability of polarizer film for liquid crystal display.

전자선 조사 방법을 이용하여 편광필름용 아크릴계 고분자를 가교화시킨 후 이의 점착 특성을 평가하였다. 아크릴 공중합체는 n-butylacrylate(BA), 2-hydroxyethyl methacrylate(HEMA), acrylic acid(AA)를 기본 단량체로 하여 다양한 조성으로 중합하였다. 아크릴 공중합체를 25 μm 두께로 PET 이형필름에 코팅한 후 편광필름에 합지하고 그 위에 전자선을 조사하여 아크릴 공중합체의 가교화 반응을 진행하였다. 모든 아크릴 공중합체는 조사선량 50 kGy에서 93% 이상의 높은 젤분율을 보였으며, 아크릴 공중합체에 도입된 HEMA 단위가 많을수록 높은 가교밀도를 보였다. BA/HEMA/AA(89.5/10/0.5 w/w/w)의 단량체 공급비로 중합된 아크릴 공중합체에 50 kGy로 전자선을 조사하여 얻어진 아크릴 점착제가 가장 우수한 박리력, 내크리프성, 내구신뢰성, 내열빛샘 특성을 보였다. 전자선 조사를 이용한 편광필름용 아크릴계 점착제의 제조 방법을 적용하면 액정 표시장치용 편광필름의 생산성 및 작업성을 크게 개선할 것으로 기대된다.

Keywords: pressure sensitive adhesives; polarizer film; acrylic copolymers; electron beam radiation.

References
  • 1. Ihm DW, Text. Sci. Eng., 38, 59 (2001)
  •  
  • 2. Lim CH, Ryu H, Cho UR, Polym.(Korea), 33(4), 319 (2009)
  •  
  • 3. Kim SR, Han IC, Choi HJ, Jang SK, Hwang IS, Korea Patent 0,076,984 (2004)
  •  
  • 4. Kim SR, Jang SK, Choi HJ, Lee JK, Han IC, Seong HR, Korea Patent 0,102,997 (2005)
  •  
  • 5. Kim SR, Han IC, Jang SK, Seong HR, Korea Patent 0,076,706 (2005)
  •  
  • 6. Choi HJ, Kim JS, Jang SK, Korea Patent 0,041,238 (2007)
  •  
  • 7. Park SJ, Han IC, Kim WH, Kim AN, Jang SK, Korea Patent 0,063,365 (2007)
  •  
  • 8. Kim NM, Ha JM, Han IC, Park SJ, Kim WH, Jang SK, Korea Patent 0,025,980 (2007)
  •  
  • 9. Lee DH, Min KE, Korea Patent 0,000,193 (2008)
  •  
  • 10. Czech Z, Gsiorowska M, Soroka J, J. Appl. Polym. Sci., 106(1), 558 (2007)
  •  
  • 11. Joo HS, Park YJ, Do HS, Kim HJ, Song SY, Choi KY, J. Adhes. Sci. Technol., 21, 575 (2007)
  •  
  • 12. Lim DH, Do HS, Kim HJ, Bang JS, Yoon GH, J. Adhes. Sci. Technol., 21, 589 (2007)
  •  
  • 13. Czech Z, Wojciechowicz M, Eur. Polym. J., 42, 2153 (2006)
  •  
  • 14. Husemann M, Bietz B, Karmann W, Klose M, Neuhaus-Steinmetz H, US Patent 6,939,588 (2005)
  •  
  • 15. Ebe K, Sasaki T, J. Appl. Polym. Sci., 88(7), 1854 (2003)
  •  
  • 16. Smirnova YA, Vasil’eva IV, Persinen AA, High Energ. Chem., 38, 425 (2004)
  •  
  • 17. Drobny JG, Radiation Technology for Polymers, 2nd, CRC Press, New York, 89 (2010)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2012; 36(3): 344-350

    Published online May 25, 2012

  • Received on Oct 24, 2011
  • Accepted on Jan 3, 2012