Composition for protection of glassware in dishwashers
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.