Stabilized bleach-sensitive dyes in automatic dishwasher...

Details Stabilized bleach-sensitive dyes in automatic dishwasher... Stabilized bleach-sensitive dyes in automatic dishwasher...

C - Chemistry, Metallurgy

11

D

134/5

C11D 3/40 (2006.01) C11D 3/395 (2006.01)

Patent

CA 1226196

ABSTRACT OF THE DISCLOSURE A method for stabilizing automatic dishwasher deter- gents containing bleach-sensitive dyes against de- colourization by the bleaching agents of the com- positions. The detergent powders comprise a bleaching agent, a bleach-sensitive dye and conventional dish- washer detergent ingredients. Prior to the addition of bleaching agent, the composition is pre-conditioned by contact with a flow of air. The resultant powder has a colour that remains essentially unchanged even after storage for two months at elevated temperatures.

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