G - Physics – 03 – C
Patent
G - Physics
03
C
G03C 7/42 (2006.01)
Patent
CA 2396002
The present invention provides for compositions and methods of making stable bleach-fix liquid concentrates, suitable for dilution to working strength solutions, using a polyvalent metal oxidizing bleaching agent, at least one fixing agent, and a source of phosphate ions. Precipitation, which occurs when an iron (III) bleaching agent is reduced by components of the concentrate, is prevented by the addition of phosphate ions.
L'invention concerne des compositions et des procédés permettant de fabriquer des concentrés liquides stables de blanchiment-fixage appropriés pour être dilués dans des bains prêt à l'emploi, au moyen d'un agent oxydant métallique polyvalent de blanchiment-fixage, au moins un agent de fixation et une source d'ions phosphate. Afin d'empêcher qu'une précipitation ne se produise, ce qui arrive lorsqu'un agent de blanchiment à base de fer (III) est réduit par des composants du concentré, on ajoute des ions phosphate.
Blake Cassels & Graydon Llp
Trebla Chemical Company
LandOfFree
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