Dishwasher detergent paste
First Claim
1. In a process for washing dishes in an automatic dishwashing machine comprising subjecting dirty dishes and utensils to the action of a wash forcefully projecting an aqueous solution containing a detergent composition on the surface of said dirty dishes and utensils, said detergent composition being released into said wash only, the improvement comprising employing as said detergent composition an aqueous, thixotropic dishwasher detergent composition which at room temperature is a paste having a viscosity of at least about 30 Pa.s. as measured at 20°
- C. with a rotational viscometer at 5 spindle revolutions per minute, is completely dissolved or suspended within about 2 to about 5 minutes after being released into said wash, and which consists essentially of;
(a) from about 3 to 40 percent by weight of sodium or potassium tripolyphosphate;
from about 5 to 30 percent by weight of sodium or potassium silicate containing a mixture of metasilicate having a Me2 O;
SiO2 molar ratio of about 1;
1 and disilicate or waterglass having a Me2 O;
SiO2 molar ratio of from about 1;
2 to 1;
3.5 in a weight ratio of from about 1;
1 to 1;
5 wherein Me is sodium or potassium;
from 0 to about 25 percent by weight of powdered, sodium aluminosilicate that binds calcium salts; and
from 0 to about 20 percent by weight of sodium or potassium carbonate or hydroxide;
(b) an alkali metal hypchlorite in an amount sufficient to provide an active chlorine content of the composition of from about 0.1 to 3.0 percent by weight; and
(c) from about 1 to 10 percent by weight of a swellable silicate that is resistant to alkalies and active chlorine and is capable of forming a thixotropic gel in water, said silicate consisting essentially of a hectorite selected from a trioctadhedral foliated magnesium silicate having the general formula
space="preserve" listing-type="equation">[(Li.sub.x Mg.sub.6-x)Si.sub.8 O.sub.20 (OH).sub.4-y F.sub.y ].sup.x(-) ·
(x/n)M.sup.n(+)wherein x represents a number of from 0 to about 6, y represents a number of from 0 to about 4, n represents an integer of from 1 to 3, and M represents a cation, all weights being based on the total weight of the detergent composition.
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Abstract
This invention is directed to an aqueous, thixotropic dishwater detergent composition which is at room temperature a paste having a viscosity of at least about 30 Pa.s as measured at 20° C. with a rotational viscometer at 5 spindle revolutions per minute, the dishwasher detergent composition comprising:
(a) at least one compound with cleaning action or binding capacity for ions causing hardness selected from the group consisting of polyphosphates, aluminosilicates, silicates, hydroxides, and carbonates of sodium or potassium in an amount sufficient to effect cleaning or binding;
(b) an active chlorine compound in an amount sufficient to provide active chlorine to the detergent composition; and
(c) a thickener compatible with components (a) and (b) in an amount sufficient to give the desired viscosity.
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Citations
12 Claims
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1. In a process for washing dishes in an automatic dishwashing machine comprising subjecting dirty dishes and utensils to the action of a wash forcefully projecting an aqueous solution containing a detergent composition on the surface of said dirty dishes and utensils, said detergent composition being released into said wash only, the improvement comprising employing as said detergent composition an aqueous, thixotropic dishwasher detergent composition which at room temperature is a paste having a viscosity of at least about 30 Pa.s. as measured at 20°
- C. with a rotational viscometer at 5 spindle revolutions per minute, is completely dissolved or suspended within about 2 to about 5 minutes after being released into said wash, and which consists essentially of;
(a) from about 3 to 40 percent by weight of sodium or potassium tripolyphosphate;
from about 5 to 30 percent by weight of sodium or potassium silicate containing a mixture of metasilicate having a Me2 O;
SiO2 molar ratio of about 1;
1 and disilicate or waterglass having a Me2 O;
SiO2 molar ratio of from about 1;
2 to 1;
3.5 in a weight ratio of from about 1;
1 to 1;
5 wherein Me is sodium or potassium;
from 0 to about 25 percent by weight of powdered, sodium aluminosilicate that binds calcium salts; and
from 0 to about 20 percent by weight of sodium or potassium carbonate or hydroxide;(b) an alkali metal hypchlorite in an amount sufficient to provide an active chlorine content of the composition of from about 0.1 to 3.0 percent by weight; and (c) from about 1 to 10 percent by weight of a swellable silicate that is resistant to alkalies and active chlorine and is capable of forming a thixotropic gel in water, said silicate consisting essentially of a hectorite selected from a trioctadhedral foliated magnesium silicate having the general formula
space="preserve" listing-type="equation">[(Li.sub.x Mg.sub.6-x)Si.sub.8 O.sub.20 (OH).sub.4-y F.sub.y ].sup.x(-) ·
(x/n)M.sup.n(+)wherein x represents a number of from 0 to about 6, y represents a number of from 0 to about 4, n represents an integer of from 1 to 3, and M represents a cation, all weights being based on the total weight of the detergent composition. - View Dependent Claims (2, 3, 4, 5, 6)
- C. with a rotational viscometer at 5 spindle revolutions per minute, is completely dissolved or suspended within about 2 to about 5 minutes after being released into said wash, and which consists essentially of;
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7. In a process for washing dishes in an automatic dishwashing machine comprising subjecting dirty dishes and utensils to the action of a wash forcefully projecting an aqueous solution containing a detergent composition on the surface of said dirty dishes and utensils, said detergent composition being released into said wash only, said detergent composition consisting essentially of:
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(a) from about 3 to 40 percent by weight of sodium or potassium tripolyphosphate; and (b) an alkali metal hypochlorite in an amount sufficient to provide an active chlorine content of the composition of from about 0.1 to 3.0 percent by weight;
the improvement comprising employing as said detergent composition an aqueous, thixotropic dishwasher detergent composition which at room temperature is a paste having a viscosity of at least about 30 Pa.s as measured at 20°
C. with a rotational viscometer at 5 spindle revolutions per minute, is completely dissolved or suspended within about 2 to about 5 minutes after being released into said wash, and which contains;(c) from about 5 to about 30 percent by weight of sodium or potassium silicate containing a mixture of metasilicate having a Me2 O;
SiO2 molar ratio of about 1;
1 and disilicate or waterglass having a Me2 O;
SiO2 molar ratio of from about 1;
2 to 1;
3.5 in a weight ratio of from about 1;
1 to 1;
5 wherein Me is sodium or potassium;(d) from 0 to about 25 percent by weight of powdered, sodium aluminosilicate that binds calcium salts; (e) from 0 to about 20 percent by weight of sodium or potassium carbonate or hydroxide; and (f) from about 1 to about 10 percent by weight of a swellable silicate that is resistant to alkalies and active chlorine and is capable of forming a thixotropic gel in water, said silicate consisting essentially of a hectorite selected from a trioctadhedral foliated magnesium silicate having the general formula
space="preserve" listing-type="equation">[(Li.sub.x Mg.sub.6-x)Si.sub.8 O.sub.20 (OH).sub.4-y F.sub.y ].sup.x(-) ·
(x/n)M.sup.n(+)wherein x represents a number of from 0 to about 6, y represents a number of from 0 to about 4, n represents an integer of from 1 to 3, and M represents a cation, all weights being based on the total weight of the detergent composition. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification