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    • 5. 发明授权
    • Photographic bleach compositions and methods of photographic processing
    • 摄影漂白剂组合物和摄影处理方法
    • US5334491A
    • 1994-08-02
    • US125491
    • 1993-09-22
    • David G. FosterKeith H. StephenMary E. Craver
    • David G. FosterKeith H. StephenMary E. Craver
    • G03C5/44C11D3/395G03C7/42
    • C11D3/395G03C7/42
    • Bleach compositions and methods that are improvements over those provided by Fyson, U.S. Pat. No. 4,294,914, are disclosed. A highly preferred bleach composition of this invention (a) has the ferric complex of methyliminodiacetic acid as a bleaching agent, and additionally comprises (b) at least 0.9 mole of acetic acid per liter, (c) from about 15 to about 35 grams per liter of potassium bromide; and (d) has a pH of from about 2.5 to about 4.0.This invention includes the discovery of a synergistic bleaching coaction of a bleach (i) comprising an alkyliminodiacetic acid such as methyliminodiacetic acid, and (ii) which has a pH of from about 3.5 to about 4.5 , and (iii) in which the amount of ferric iron is from about 2 to about 16 grams per liter. This coaction between iron levels and pH was previously unknown and was unexpected.Bleach formulations of this invention can be used in the processing of color photographic materials, such as film.
    • 漂白剂组合物和方法是Fyson,美国专利中提供的那些。 公开了第4,294,914号。 本发明(a)的高度优选的漂白组合物具有甲基亚氨基二乙酸作为漂白剂的三价络合物,并且还包含(b)每升至少0.9摩尔乙酸,(c)约15至约35克/ 升溴化钾; 和(d)的pH为约2.5至约4.0。 本发明包括发现包含烷基亚氨基二乙酸如甲基亚氨基二乙酸的漂白剂(i)和(ii)其pH为约3.5至约4.5的漂白剂(i),和(iii)其中 三价铁每升约2至约16克。 铁水平和pH之间的这种共同作用以前是未知的,并且是意想不到的。 本发明的漂白剂可用于彩色照相材料如胶片的加工。