ACRYLIC COPOLYMER, OPTICAL FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an acrylic copolymer which is small in both orientation birefringence and photoelastic birefringence and also has excellent transparency and heat resistance when it is formed into a film shape.SOLUTION: An acrylic copolymer according to the invention comprises a (meth) alkyl acrylate unit of 70-85 mass%, an N-substituted maleimide unit of 1-30 mass%, and a (meth) acrylamide unit of 1-20 mass%.