| 摘要 |
NEW MATERIAL:Disazo compounds of formula I, wherein A is a group of formula II, III or IV (wherein R is alkyl, alkoxy, nitro, halogen, cyano, halomethyl; n is an integer of 0-3). USE:Charge generating materials for electrophotographic materials (particularly, laminated type). The compds. have higher sensitivity than that of conventional disazo compds. and are superior in image reproducibility even for red copies. PREPARATION:A diamino compd. is diazotized with sodium nitrite in an inorg. acid. The resulting tetrazonium compd. of formula VI (wherein X is an anion functional group) is coupled with a compd. corresponding to a group of formula II, III or IV. |
