Stable solid block metal protecting warewashing detergent composition
AssigneeEcolab Inc.
InventorsSteven E. Lentsch, Victor F. Man, Keith E. Olson
Life of this patent
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Abstract
The dimensionally stable alkaline solid block warewashing detergent uses an E-form binder forming a solid comprising a sodium carbonate source of alkalinity, a metal corrosion protecting alkali metal silicate composition, a sequestrant, a surfactant package and other optional material. The solid block is dimensionally stable and highly effective in removing soil from the surfaces of dishware in the institutional and industrial environment. The E-form hydrate comprises an organic phosphonate and a hydrated carbonate.
Claims18
A solid block warewashing detergent composition comprising a continuous extruded or cast solid composition, the composition comprising:
- (a) about 10 to 80 wt % of Na.sub.2 CO.sub.3 ;
- (b) an alkali metal silicate having a M.sub.2 O:SiO.sub.2 ratio of about 1:1 to 1:5;
- and
- (c) an effective amount of an organic phosphonate hardness sequestering agent comprising a potassium salt;
- wherein the composition provides metal protection and hardens to a solid form within about 1 minute to about 20 minutes, and the block comprises about 5 to 20 wt % anhydrous sodium carbonate and a binding agent comprising sufficient amounts of hydrated sodium carbonate and phosphonate comprising a potassium salt, to form the solid block detergent, and wherein the block comprises either no second source of alkalinity or less than a solidification interfering amount of a second source of alkalinity.
A method of cleaning ware with a metal protecting anticorrosion alkaline detergent, the method comprising:
- (a) contacting ware with a continuous extruded or cast solid composition which hardens to a solid form within about 1 minute to about 20 minutes comprising an alkaline solid block warewashing detergent comprising about 20 to 60 wt % of Na.sub.2 CO.sub.3 ;
- about 10 to 30 wt % of an alkali metal silicate having an M.sub.2 O:SiO.sub.2 ratio of about 1:1 to 1:5;
- and about 0.1 to 20 wt % of an organic phosphonate hardness sequestering agent comprising a potassium salt;
- the block comprising about 5 to 20 wt % anhydrous sodium carbonate and a binding agent comprising sufficient amounts of hydrated sodium carbonate and a potassium phosphonate to form the solid block detergent;
- wherein the block comprises either no second source of alkalinity or less than a solidification interfering amount of a second source of alkalinity, creating washed ware while protecting metal ware from corrosion;
- and
- (b) rinsing the washed ware.
Dependencies are inferred from the claim text.