Patent ID: 8232031

Claim:
A naphthalenetetracarboxylic acid diimide derivative represented by the following general formula (1): wherein R 1 and R 2 , which are identical or different, each represent a substituted or non-substituted alkyl group or a substituted or non-substituted aromatic hydrocarbon group; R 3 represents an alkyl group having 1 to 8 carbon atoms or an aromatic hydrocarbon group; R 4 , R 5 , R 6 and R 7 , which are identical or different, each represent a hydrogen atom, a substituted or non-substituted alkyl group, or a substituted or non-substituted aromatic hydrocarbon group; with compounds where all of R 1 , R 2 and R 3 are a methyl group, and compounds where both of R 1 and R 2 are a methyl group and R 3 is a 1-octyl group being excluded.