Patent ID: 8664309

Claim:
An optical film comprising a base film and an adhesive layer which is formed on the base film and has a massive material dispersed in an adhesive, wherein the massive material contains a diimonium compound represented by the following formula (1) and has a melting point of at least 200° C.: wherein R 1 to R 8 represent each independently an unsubstituted or substituted, same or different, C 1-6 aliphatic hydrocarbon group, provided that from 4.9 to 8 groups among R 1 to R 8 are a C 1-3 aliphatic hydrocarbon group (in which some of hydrogen atoms may be substituted by halogen atoms), and X − represents (R 9 SO 2 ) 3 C − , wherein R 9 represents a C 1-4 aliphatic hydrocarbon group which is unsubstituted or substituted by a halogen atom.