Composition for the protection of glassware in a dishwasher

Abstract

The present invention provides a composition. The composition comprises zinc and bismuth. The composition is for use in the protection of glassware in an automatic dishwashing process from detrimental effects caused by exposure to aluminium.

1 . A composition for use in the protection of glassware exposed to aluminum in an automatic dishwashing process, said composition comprising zinc and bismuth, wherein the composition comprises a detergent composition, a rinse aid composition or a soluble glass or ceramic composition and wherein the ration of zinc to bismuth in the composition is from 1:100 to 100:1 based on mass of the metals. 
   
   
       2 . (canceled) 
   
   
       3 . A composition according to  claim 1 , wherein the mass ratio of zinc to bismuth in the composition is from 1:10 to 10:1. 
   
   
       4 . A composition according to  claim 1 , wherein the zinc or bismuth are in metallic form. 
   
   
       5 . A composition according to  claim 4 , wherein the metallic form is an alloy of zinc and bismuth. 
   
   
       6 . A composition according to  claim 1 , wherein the zinc and/or bismuth are present as a salt or compound. 
   
   
       7 . A composition according to  claim 6 , wherein the salt or compound is a nitrate, oxide, sulphate, phosphate, halide, carbonate or carboxylate salt. 
   
   
       8 . (canceled) 
   
   
       9 . A composition according to  claim 1 , wherein the bismuth and zinc comprise from 0.002 wt % to 6 wt % based on the weight of both metals of the detergent formulation. 
   
   
       10 . A composition according to  claim 9 , wherein the bismuth and zinc comprise from 0.01 to 3 wt % and most preferably from 0.02 to 1.3 wt % (e.g. 0.4 wt %) of the detergent formulation. 
   
   
       11 . (canceled) 
   
   
       12 . A composition according to  claim 1 , wherein the bismuth and zinc comprise from 0.03 wt % to 30 wt % based on the weight of both metals of the rinse aid formulation 
   
   
       13 . (canceled) 
   
   
       14 . The use of a composition comprising zinc and bismuth for the protection of glassware in an automatic dishwashing process from detrimental effects caused by exposure of the glassware to aluminium. 
   
   
       15 . The use according to  claim 14 , wherein the amount of zinc and bismuth provided to a dishwasher cycle is from 1 to 1000 mg. 
   
   
       16 . The use according to  claim 15 , wherein the amount of zinc and bismuth provided to a dishwasher cycle is from 5 to 500 mg. 
   
   
       17 . The use according to  claim 16 , wherein 5 to 100 mg zinc and 5 to 100 mg bismuth is provided to a dishwasher cycle. 
   
   
       18 . An automatic dishwashing process additive composition comprising zinc, bismuth and aluminium for prevention of glassware corrosion in an automatic dishwasher. 
   
   
       19 . An automatic dishwashing process additive composition containing zinc, bismuth and silicate for prevention of aluminium corrosion in an automatic dishwasher. 
   
   
       20 . An automatic dishwashing process additive composition containing zinc, bismuth and silicate for prevention of aluminium corrosion and glassware corrosion in an automatic dishwasher. 
   
   
       21 . The automatic dishwashing process additive composition of  claim 20 , wherein the zinc is present as zinc acetate, the bismuth is present as bismuth citrate and the silicate is present as sodium disilicate. 
   
   
       22 . The automatic dishwashing process additive composition of  claim 20 , wherein the amount of silicate is present in a ratio to zinc and bismuth of up to 500:1. 
   
   
       23 . The automatic dishwashing process additive composition of  claim 22 , wherein the amount of silicate is present in a ratio to zinc and bismuth of up to 500:1.