Composition for protection of glassware in dishwashers

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 comprising zinc and bismuth for use in the protection of glassware exposed to aluminium in an automatic dishwashing process from detrimental effects.  
   
   
       2 . A composition according to  claim 1 , wherein the ratio of zinc to bismuth in the composition is from 1:100 to 100:1 based on mass of the metals.  
   
   
       3 . A composition according to  claim 2 , 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 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 . A composition according to  claim 1 , wherein the composition comprises a detergent formulation.  
   
   
       9 . A composition according to  claim 8 , 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 % of the detergent formulation.  
   
   
       11 . A composition according to  claim 1 , wherein the composition comprises a rinse aid formulation.  
   
   
       12 . A composition according to  claim 11 , 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 . A composition according to  claim 1 , wherein the composition comprises a soluble ceramic or glass formulation.  
   
   
       14 . A method for protecting glassware being treated in an automatic dishwashing process which method comprises: 
 providing an effective amount of a composition comprising zinc and bismuth for the protection of said glassware from detrimental effects caused by exposure of the glassware to aluminium during the said process.    
   
   
       15 . The method according to  claim 14 , wherein the amount of zinc and bismuth provided during the process is from 1 to 1000 mg.  
   
   
       16 . The method use according to  claim 15 , wherein the amount of zinc and bismuth provided during the process is from 5 to 500 mg.  
   
   
       17 . The method use according to  claim 16 , wherein 5 to 100 mg zinc and 5 to 100 mg bismuth is provided during the process.  
   
   
       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.