Automatic dishwashing tablets with improved chlorine stability

Details Automatic dishwashing tablets with improved chlorine stability Automatic dishwashing tablets with improved chlorine stability

C - Chemistry, Metallurgy

11

D

C11D 17/00 (2006.01) C11D 1/72 (2006.01) C11D 3/37 (2006.01) C11D 3/395 (2006.01)

Patent

CA 2374881

Solid automatic dishwasher detergent tablets have a chlorine source to mist preferably provide 0.5 to 5 percent available chlorine; and a chlorine stability enhancing effective amount of preferably between about 0.5 to about 10 percent by weight of one or more nonionic surfactants having the following structure: R-(AO1)x(AO2)y-OR' wherein: R is a C6-C18 alkyl group, AO1 represents propylene oxide or a mixture of propylene oxide and other alkylene oxides, AO2 represents ethylene oxide or a mixture of ethylene oxide and other alkylene oxides, R' is an alkyl, arylalkyl, or benzalkyl group with 1 to about 10 carbon atoms, x is 2-20, y is 0-20, and the sum of x plus y is 5 or greater. The nonionic surfactant imparts improved chlorine stability to the tablet such that greater than 80 percent of the chlorine in the table remains active for eight weeks when the tablet is stored at 120°F.

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