Patent ID: 7867632

Claim:
An arylamine compound having a molecular weight of 1,500 to 6,000 represented by formula (1): wherein X represents a single bond, CH or CH 2 , or N or NH; Ar 1 and Ar 2 are respectively the same and each represents a substituted or unsubstituted biphenylene group or terphenylene group; R 1 , R 2 , R 3 , and R 4 each independently represents an aryl group, wherein the aryl group may be substituted by a diarylamine group in such a manner as to form a triphenylamine partial structure, and the aryl group at the terminal may be substituted, by repetition, by a diarylamino group in such a manner as to form a triphenylamine partial structure; m represents an integer of 0 to 2; and n represents 0 or 1.