Bleaching bath with bleach accelerating substances

专利名称：Bleaching bath with bleach accelerating

substances

发明人：BERGTHALLER, PETER, DR.,HAESELER,

HELMUT,MECKL, HEINZ, DR.

申请号：EP88120873.0申请日：19881214公开号：EP0321839B1公开日：19921111

摘要：Bleaching baths and bleach-fixing baths, which contain an iron(III) ion complexsalt as bleaching agent and additionally a 5- to 7-membered heterocyclic compoundwhich contains at least one N atom and at least one further hetero atom from the seriesO, N, S and which is substituted by -S<(-)> and carries a positive charge on the quaternaryring nitrogen atom, arranged in such a way that no tautomeric charge compensation togive a neutral thione form is possible, ensure, due to an excellent bleaching rate andsimultaneously good stability, good bleaching in colour materials within the usualprocessing times, that is to say they ensure blackening without residual silver in colournegative materials and low minimum densities in colour reversal materials.

申请人：AGFA-GEVAERT AG,AGFA-GEVAERT AG

地址：W-5090 LEVERKUSEN 1,W-5090 LEVERKUSEN 1

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