Patent ID: 7834214

Claim:
An aromatic amine derivative represented by the following formula (3): wherein R 1 and R 2 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, a substituted or unsubstituted alkoxyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 50 carbon atoms, a substituted or unsubstituted arylamino group having 5 to 50 carbon atoms, a substituted or unsubstituted alkylamino group having 1 to 20 carbon atoms, a cyano group or a halogen atom; A 1 to A 4 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, a substituted or unsubstituted alkoxyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 50 carbon atoms, a substituted or unsubstituted arylamino group having 5 to 50 carbon atoms, a substituted or unsubstituted alkylamino group having 1 to 20 carbon atoms, a substituted or unsubstituted silyl group or a halogen atom; a, b, c and d each independently represents an integer of 0 to 5, when a, b, c and d each are 2 or greater, A 1 to A 4 may be the same with or different from each other, and may bond each other to form a saturated or unsaturated ring; and further an A 1 and an A 2 , and an A 3 and an A 4 may bond each other to form a saturated or unsaturated ring; wherein both of R 1 and R 2 cannot be hydrogen atoms at the same time and wherein at least one of a, b, c and d is an integer of 2 or greater.