Detergent compositions containing silver anti-tarnishing agents

Details Detergent compositions containing silver anti-tarnishing agents Detergent compositions containing silver anti-tarnishing agents

C - Chemistry, Metallurgy

11

D

C11D 7/56 (2006.01) C11D 3/00 (2006.01) C11D 3/28 (2006.01) C11D 3/39 (2006.01) C11D 3/395 (2006.01) C11D 7/32 (2006.01)

Patent

CA 2171312

A bleaching detergent composition which prevents or inhibits tarnishing of silver comprises: (a) a bleaching agent selected from a peroxygen or peroxygen- yielding compound, a hypohalite or hypohalite-yielding compound, or a salt thereof, or mixtures thereof; (b) an anti-tarnishing agent selected from: (i) a purine class compound; (ii) cyanuric acid or isocyanuric acid or a salt thereof; (iii) a 1,3-N azole compound; (iv) a mixture of any of the above compounds (i), (ii) or (iii); (c) optionally a builder; (d) optionally, a surfactant; wherein the composition exhibits a pH value in the range from 7 to 13, and wherein the anti-tarnishing agent has a pKa value below the pH value of an aqueous solution of the composition.

Une composition détergente de blanchiment qui empêche ou inhibe le ternissement de l'argent, comprend: (a) un agent de blanchiment choisi parmi un composé peroxygène ou à rendement peroxygène, un composé hypohalite ou à rendement hypohalite, ou un sel ou des mélanges de ces composés; (b) un agent contre le ternissement choisi parmi: (i) un composé de classe purine; (ii) un acide cyanurique ou isocyanurique ou un sel de l'un ou l'autre; (iii) un composé 1,3-N azole; (iv) un mélange de deux ou plusieurs des composés (i), (ii) ou (iii); (c) le cas échéant, un adjuvant; (d) le cas échéant, un tensioactif. Cette composition présente un pH s'échelonnant entre 7 et 13, et l'agent contre le ternissement a un pK¿a? inférieur au pH d'une solution aqueuse de la composition.

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