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| Refractory lattice and fabrication |
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Low phosphate content dishwashing detergent
| Details |
Inventors: McLaughlin, Robert L.; Wood, Donald C.;
Assignee: DeSoto, Inc. (Des Plaines, IL)
Primary Examiner: Weinblatt; Mayer
Assistant Examiner:
Attorney, Agent or Firm: Dressler, Goldsmith, Clement, Gordon & Shore, Ltd.
A dry powder detergent composition suitable for machine dishwashing and which contains a low-phosphate content of from about 10 to about 20 weight percent utilizes, as the essential combination of components, an alkali metal tripolyphosphate or an alkali metal hexametaphosphate, an appropriate proportion of an alkali metal carbonate, an alkali metal silicate, and a mixture of a high-foaming nonionic surfactant with a foam reducing agent. The surfactant is preferably liquid and is sorbed on solid constituents of the composition to provide a detergent which exhibits superior performance in hard water notwithstanding the relatively low phosphate content of the composition. The nonionic surfactant mixture preferably further comprises an oil-soluble, nonionic surfactant. |
|
DETAILED DESCRIPTION We claim: 1.
A dry powder, low-phosphate machine dishwashing composition which consists essentially of: about 10 to about 20 weight percent of a phosphorus-containing compound selected from the group consisting of an alkali metal tripolyphosphate and an alkali metal hexametaphosphate; at least 8 weight percent of carbonate compounds selected from the group consisting of alkali metal carbonate, bicarbonate or sesquicarbonate, providing a carbonate-to-phosphate weight ratio of about 0.
8:1 to about 1.
3:1; a water-soluble alkali metal silicate powder in an amount providing at least about 2.
8 weight percent of said composition of soluble SiO.
sub.
2, the weight ratio of SiO.
sub.
2 /alkali metal oxide in said silicate powder being about 1.
8:1 to about 2.
6:1; and at least about 1 up to about 10 weight percent of said composition of a water-soluble high-foaming nonionic surfactant which is an ethoxylated monohydric compound containing at least about 7 moles of ethylene oxide per mol of monohydric compound, and a foam reducing agent therefor.
2.
The detergent composition in accordance with claim 1 wherein said composition additionally contains a liquid surfactant which is an oil-soluble, hydrophobic ethoxylated alkanol containing about 8 to about 18 carbon atoms and about 1 to about 5 moles of ethylene oxide per mole of alkanol, said oil-soluble surfactant being present in a weight ratio with respect to said high-foaming nonionic surfactant of 9:1 to 1:9.
3.
The detergent composition in accordance with claim 1 wherein said high-foaming nonionic surfactant is present in an amount of at least about 2 weight percent of the composition.
4.
The detergent composition in accordance with claim 1 in which said high-foaming nonionic surfactant is a liquid water-soluble ethoxylate of alkanol containing from 8 to 18 carbon atoms with at least about 7 moles of ethylene oxide per mol of alkanol, said liquid surfactant being absorbed on the solid constituents of the composition.
5.
A dry powder, low-phosphate machine dishwashing detergent composition in accordance with claim 5 which consists essentially of: about 17 weight percent sodium tripolyphosphate; about 20 weight percent sodium carbonate; about 5
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