Solid cast warewashing composition; encapsulated bleach source
First Claim
1. A solid cast warewashing composition which comprises:
- (a) about 20 to 55 wt-%, based upon the solid cast warewashing composition and calculated on an anhydrous basis, of a hydratable, crystalline alkali metal silicate composition;
(b) about 1 to 70 wt-%, based upon the solid cast warewashing composition, of an alkali metal condensed phosphate composition, having sufficient water of hydration to allow the cast warewashing composition to solidify;
(c) about 0.2 to 20 wt-%, based upon the solid cast warewashing composition, of an encapsulated bleaching source which comprises;
(i) a bleaching agent core;
(ii) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and
(iii) an outer coating of an encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof; and
(d) about 8 to 60 wt-%, based upon the solid cast warewashing composition, water.
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Accused Products
Abstract
Solid cast detergent-containing articles are produced for use in automatic washing machines. A liquid detergent composition is cast into a mold where it is allowed to solidify. The cast detergent composition includes alkali metal metasilicate, alkali metal condensed phosphate, an encapsulated bleaching source, and water for hydration. The composition optionally further includes a dye, a perfume, a surfactant, a defoamer, an additional sequestering agent such as an alkali metal salt of a polyacrylic compound, a neutral soluble salt such as an alkali metal sulphate or an alkali metal chloride, an alkali compound such as an alkali metal hydroxide, an alkali metal sesquicarbonte, an alkali metal borate, or mixtures thereof.
67 Citations
37 Claims
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1. A solid cast warewashing composition which comprises:
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(a) about 20 to 55 wt-%, based upon the solid cast warewashing composition and calculated on an anhydrous basis, of a hydratable, crystalline alkali metal silicate composition; (b) about 1 to 70 wt-%, based upon the solid cast warewashing composition, of an alkali metal condensed phosphate composition, having sufficient water of hydration to allow the cast warewashing composition to solidify; (c) about 0.2 to 20 wt-%, based upon the solid cast warewashing composition, of an encapsulated bleaching source which comprises; (i) a bleaching agent core; (ii) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (iii) an outer coating of an encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof; and (d) about 8 to 60 wt-%, based upon the solid cast warewashing composition, water. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A solid cast warewashing composition which comprises:
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(a) about 20 to 40 wt-%, based upon the solid cast warewashing composition and calculated on an anhydrous basis, of a hydratable, crystalline alkali metal silicate composition; (b) about 15 to 40 wt-%, based upon the solid cast warewashing composition, of an alkali metal condensed phosphate composition, having sufficient water of hydration to allow the cast warewashing composition to solidify; (c) about 0.1 to 15 wt-%, based upon the solid cast warewashing composition, of an encapsulated bleaching source which comprises; (i) a bleaching agent core; (ii) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (iii) an outer coating of an encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof; and (d) about 8 to 35 wt-%, based upon the solid cast warewashing composition, water. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of cleaning ware which comprises the steps of:
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(a) contacting a solid cast warewashing composition and water to form an aqueous cleaning solution; and (b) contacting soiled ware with the cleaning solution so as to remove soil from the soiled ware;
wherein the solid cast warewashing composition comprises;(i) about 20 to 55 wt-%, based upon the solid cast warewashing composition and calculated on an anhydrous basis, of a hydratable, crystalline alkali metal silicate; (ii) about 1 to 70 wt-%, based upon the solid cast warewashing composition, of an alkali metal condensed phosphate composition, having sufficient water of hydration to allow the cast warewashing composition to solidify; and (iii) about 0.1 to 20 wt-%, based upon the solid cast warewashing composition, of an encapsulated bleaching source which comprises; (1) a bleaching agent core; (2) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (3) an outer coating of an encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof; and (iv) about 8 to 60 wt-% water, based upon the solid cast warewashing composition. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of making a solid cast warewashing composition which comprises the steps of:
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(a) combining about 8 to 60 wt-%, based upon the solid cast warewashing composition, water and about 20 to 55 wt-%, based upon the solid cast warewashing composition, of a hydratable, crystalline alkali metal silicate composition to form an aqueous composition; (b) heating the aqueous composition to a temperature of about 35°
C. to 99°
C.;(c) cooling the hydrated alkali metal silicate to a temperature below about 65°
C.;(d) combining about 1 to 70 wt-%, based upon the solid cast warewashing composition, alkali metal condensed phosphate composition having sufficient water of hydration to allow the cast warewashing composition to solidify, and the cooled hydrated alkali metal silicate composition to form a mixture; (e) cooling the mixture to below about 55°
C.;(f) combining the cooled mixture and about 0.1 to 20 wt-%, based upon the solid cast warewashing composition, of an encapsulated bleaching source to form a liquid detergent composition;
the encapsulated bleaching source comprising;(i) a bleaching agent core; (ii) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (iii) an outer coating of an encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof; and (g) casting the liquid detergent composition into a container to form the solid cast warewashing composition. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification