<p>An electrophotographic developing powder comprising a resin, a coloring agent and a compound of the following formula, as a charge-contrilling agent: <CHEM> wherein X is sodium or potassium, and M is a chromium or cobalt atom.</p>
申请公布号
EP0393479(A2)
申请公布日期
1990.10.24
申请号
EP19900106848
申请日期
1990.04.10
申请人
HODOGAYA CHEMICAL CO., LTD.
发明人
NIIMURA, ISAO, C/O HODOGAYA CHEMICAL CO., LTD.;ANZAI, MITSUTOSHI, C/O HODOGAYA CHEMICAL CO., LTD.;YAMAGA, HIROYOSHI, C/O HODOGAYA CHEMICAL CO., LTD.;AKUZAWA, NOBORU, C/O HODOGAYA CHEMICAL CO., LTD.