Resin films for optical films and methods for manufacturing resin films for optical films

Abstract

This invention relates to a resin film for optical films, comprising: an amorphous resin having positive birefringence, and a diacetal compound represented by formula (1). In the above film, the diacetal compound is precipitated in a crystalline or associated state exhibiting negative birefringence. (In the formula, R1, R2, R3, R4, R5, and R6 may be the same or different, representing hydrogen atoms, alkyl groups having 1 to 4 carbon atoms, alkoxy groups having 1 to 4 carbon atoms, alkoxy carbonyl groups having 1 to 4 carbon atoms, alkyl halides having 1 to 4 carbon atoms, or halogen atoms, respectively. R7 represents hydrogen atoms, alkyl groups having 1 to 4 carbon atoms, alkenyl groups having 1 to 4 carbon atoms, alkoxy groups having 1 to 4 carbon atoms, alkoxy carbonyl groups having 1 to 4 carbon atoms, or alkyl halides having 1 to 4 carbon atoms). none

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