Block-form detergent free from alkali hydroxides for use in dishwashing machines and a process for its production
First Claim
1. A storage stable detergent in the form of fused blocks made from a liquid melt free of alkali metal hydroxide for use in dishwashing machines containing from about 65 to about 85% by weight, based on the weight of the detergent, of a mixture of alkali metal silicates and pentaalkalitriphosphates, said silicates being present in an amount of between about 5 and about 60% by weight, and being selected from sodium metasilicate nonahydrate, sodium metasilicate hexahydrate, sodium metasilicate pentahydrate, sodium metasilicate anhydrous, and mixtures thereof, and homogeneously distributed throughout said detergent from about 0.2 to about 4% by weight of a chlorine donor.
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Abstract
A block-form detergent free of alkali metal hydroxides for use in dishwashing machines which contain from 65 to 85% by weight to a mixture of anhydrous sodium metasilicate and anhydrous pentasodium triphosphate in a ratio of from 1:1 to 1:2 and from 0.2 to 4% by weight of uniformly distributed active chlorine donors which are, for example, trichloroisocyanuric acid. The production process comprises heating sodium metasilicate to 45° to 55° C. to obtain a clear melt and then adding other constituents, the pentasodium triphosphate and the active chlorine donor being added last, and pouring the melt into flexible molds in which it is left to solidify into blocks. The detergents are stable for storage with good dissolving power.
20 Citations
20 Claims
- 1. A storage stable detergent in the form of fused blocks made from a liquid melt free of alkali metal hydroxide for use in dishwashing machines containing from about 65 to about 85% by weight, based on the weight of the detergent, of a mixture of alkali metal silicates and pentaalkalitriphosphates, said silicates being present in an amount of between about 5 and about 60% by weight, and being selected from sodium metasilicate nonahydrate, sodium metasilicate hexahydrate, sodium metasilicate pentahydrate, sodium metasilicate anhydrous, and mixtures thereof, and homogeneously distributed throughout said detergent from about 0.2 to about 4% by weight of a chlorine donor.
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2. An alkali metal hydroxide-free, storage stable detergent in the form of a fused block made from a liquid melt consisting essentially of, based on the total weight of the detergent;
- from about 65 to about 85% of a mixture of sodium metasilicates and pentasodium triphosphates, the ratio of said triphosphates to said metasilicates on an anhydrous basis being from about 1;
1 to about 1;
2 wherein said metasilicates are selected from the group consisting of sodium metasilicate nonahydrate, sodium metasilicate hexahydrate, sodium metasilicate pentahydrate, sodium metasilicate anhydrous, and mixtures thereof, from about 11 to about 34.8% of total water, and from about 0.2 to about 4% of an organic chlorine donor homogeneously distributed throughout said detergent. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
- from about 65 to about 85% of a mixture of sodium metasilicates and pentasodium triphosphates, the ratio of said triphosphates to said metasilicates on an anhydrous basis being from about 1;
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11. A process for preparing a homogeneous alkali metal hydroxide-free, storage stable detergent composition in the form of fused blocks, said composition consisting essentially of, based on the total weight of the detergent;
- from about 65 to about 85% of a mixture of sodium metasilicates and pentasodium triphosphates, the ratio of said triphosphates to said silicates on an anhydrous basis being from about 1;
1 to about 1;
2, from about 11 to about 34.8% of total water, and from about 0.2 to about 4% of an organic chlorine donor, homogeneously distributed throughout said detergent which comprises heating sodium metasilicate nonahydrate at about 45°
to about 60°
C. to a clear melt and adding the remaining ingredients with stirring, the pentasodium triphosphate and the chlorine donor being added last and while the mixture is liquid, and pouring the mixture into a mold to cool and solidify. - View Dependent Claims (12, 14, 15, 16, 19, 20)
- from about 65 to about 85% of a mixture of sodium metasilicates and pentasodium triphosphates, the ratio of said triphosphates to said silicates on an anhydrous basis being from about 1;
Specification