Partially oxidized polyalkyleneimine antioxidant for photographic developers

摘要: The present invention relates to a developer comprising a developing agent and polyalkyleneimine antioxidant being formed by the condensation of number alkyleneimine units having the following formula (I):    wherein R 1 , 2 3 independently represent an unsubstituted or substituted alkylene group or may be H;    x y integer from 39,999;    the sum x represents 10 40,000; amine groups have been partially oxidized with hydrogen peroxide compound capable generating hydrogen peroxide, prior introduction developing agent. In preferred embodiment, has such that amount hydroxylammonium is less than half total equivalent original before addition the developing another further comprises alkaline buffer. invention, which preferably colour developer, sensitometry similar made conventional antioxidants environmentally acceptable.