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US 4,917,812 AGranted
Granular automatic dishwasher detergent composition providing glassware protection containing insoluble zinc compound
AssigneeThe Procter & Gamble Company
InventorWilliam A. Cilley
Life of this patent
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Abstract
Disclosed are granular automatic dishwashing detergent compositions containing an insoluble inorganic zinc salt useful for inhibition of glassware corrosion in the dishwasher. These compositions are particularly desirable because use of them in the dishwasher does not result in precipitation of zinc insolubles on the dishware or dishwasher parts.
Claims18
A granular automatic dishwashing detergent composition comprising:
- (a) from about 0.1% to about 8.0% of a detergent surfactant;
- (b) an amount of a chlorine bleach ingredient sufficient to provide the composition with from 0% to about 5.0% of available chlorine based on the weight of the detergent composition;
- (c) from about 10% to about 80% of a detergency builder material;
- (d) an amount of an insoluble inorganic zinc compound having a maximum particle size of less than about 1.7 millimeters that will provide the composition with from about 0.02% to about 10.0% zinc.
1 more element
A granular automatic dishwashing detergent composition comprising:
- (a) from about 15% to about 35% of tripolyphosphate;
- (b) from about 10% to about 35% of sodium carbonate;
- (c) from about 5% to about 10% of sodium silicate solids having an SiO.sub.2 :Na.sub.2 O ratio of from about 1.6 to about 3.2;
- (d) from about 0.5% to about 5.0% of an ethoxylated propoxylated nonionic surfactant;
- (e) from about 1.0% to about 5.0% of a chlorocyanurate;
- and
- (f) from about 0.2% to about 1.0% of zinc carbonate having an average particle size of less than 100 microns.
4 more elements
A method for preparing an automatic dishwashing detergent composition comprising;
- (a) high shear mixing of an aqueous solution of soluble silicate with an aqueous solution of a soluble zinc salt, at a molar ratio of zinc metal to SiO.sub.2 of less than about 0.1:1, to prepare a silica colloid having a dispersion of zinc silicate particles therein which have an average size of less than about 1 micron;
- and
- (b) using the colloidal suspension of (a) to prepare a granular automatic dishwashing detergent composition.
Dependencies are inferred from the claim text.