Solid cast detergents containing encapsulated halogen bleaches and methods of preparation and use
First Claim
1. A solid, cast detergent-bleach composition, comprising:
- (a) at least 30 wt-%, based upon the composition, alkaline hydratable chemical;
(b) an effective amount of a hardness-sequestrant wherein the hardness-sequestrant is different than the alkaline hydratable chemical;
(c) about 0 to 15 wt-%, based upon the composition, polyelectrolyte wherein the polyelectrolyte is different than the alkaline hydratable chemical and the hardness-sequestrant;
(d) at least 5 wt-%, based upon the alkaline hydratable chemical, water of hydration; and
(e) about 0.5 to 25 wt-%, based upon the composition, randomly dispersed encapsulated bleach particles, comprising;
(i) about 20 to 90 wt-%, based upon the encapsulated bleach particles, core which comprises a source of active-halogen bleach;
(ii) about 0 to 50 wt-%, based upon the encapsulated bleach particles, first coating which comprises a soluble inorganic coating agent; and
(iii) about 10 to 80 wt-%, based upon the encapsulated bleach particles, second coating which comprises a synthetic detergent.
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Accused Products
Abstract
An active-halogen bleach such as dichloroisocyanurate encapsulated in a coating of dihydratea synthetic detergent such as sodium octyl sulfonate. The capsule may further comprise an initial coating of a soluble inorganic detergent builder or filler such as an alkali metal phosphate or sulfate. The capsule is stable in highly alkaline environments such as detergent compositions.
Solid cast detergent-bleach composition having minimal bleach degradation comprising an alkaline hydratable chemical such as sodium hydroxide, a hardness sequestrant such as sodium tripolyphosphate, water of hydration and encapsulated active-halogen bleach formed in accordance with this invention. Optionally the detergent-bleach composition may contain a polyelectrolyte such as polyacrylate.
87 Citations
33 Claims
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1. A solid, cast detergent-bleach composition, comprising:
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(a) at least 30 wt-%, based upon the composition, alkaline hydratable chemical; (b) an effective amount of a hardness-sequestrant wherein the hardness-sequestrant is different than the alkaline hydratable chemical; (c) about 0 to 15 wt-%, based upon the composition, polyelectrolyte wherein the polyelectrolyte is different than the alkaline hydratable chemical and the hardness-sequestrant; (d) at least 5 wt-%, based upon the alkaline hydratable chemical, water of hydration; and (e) about 0.5 to 25 wt-%, based upon the composition, randomly dispersed encapsulated bleach particles, comprising; (i) about 20 to 90 wt-%, based upon the encapsulated bleach particles, core which comprises a source of active-halogen bleach; (ii) about 0 to 50 wt-%, based upon the encapsulated bleach particles, first coating which comprises a soluble inorganic coating agent; and (iii) about 10 to 80 wt-%, based upon the encapsulated bleach particles, second coating which comprises a synthetic detergent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A solid, cast detergent-bleach composition, comprising:
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(a) at least 30 wt-%, based upon the composition, sodium hydroxide; (b) about 10 to 45 wt-%, based upon the composition, alkali metal polyphosphate; (c) about 0 to 15 wt-%, based upon the composition, polyelectrolyte wherein the polyelectrolyte is different than (a) and (b); (d) at least 5 wt-%, based upon the composition, water; and (e) about 0.5 to 25 wt-%, based upon the composition, of about 4 to 60 U.S. mesh substantially randomly dispersed encapsulated bleach particles, comprising; (i) about 35 to 60 wt-%, based upon the encapsulated bleach particles, core which comprises a source of active-halogen bleach; (ii) about 0 to 40 wt-%, based upon the encapsulated bleach particles, first coating which comprises an alkali metal phosphate, alkali metal sulfate, or mixtures thereof; and (iii) about 10 to 40 wt-%, based upon the encapsulated bleach particles, second coating which comprises an alkyl sulfonate or an alkali metal salt thereof.
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17. A process for forming a substantially uniform solid cast detergent-bleach composition, comprising the steps of:
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(a) heating about 20 to 75 wt-%, based upon the composition, of a 40 to 80 wt-% aqueous solution of an alkali metal hydroxide to about 50°
to 95°
C.;(b) substantially uniformly distributing into the aqueous caustic solution; (i) an effective amount of a wash water hardness sequestrant; (ii) about 0 to 15 wt-%, based upon the composition, polyelectrolyte which is different than the hardness-sequestrant; (iii) about 10 to 60 wt-%, based upon the composition, alkaline hydratable chemical which is different than the hardness-sequestrant and the polyelectrolyte; and (iv) about 0.5 to 25 wt-%, based upon the composition, encapsulated bleach particles comprising; (A) about 20 to 90 wt-%, based upon the encapsulated bleach particles, core which comprises a source of active-halogen bleach; (B) about 0 to 50 wt-%, based upon the encapsulated bleach particles, first coating which comprises a soluble inorganic coating agent; and (C) about 10 to 80 wt-%, based upon the encapsulated bleach particles, second coating which comprises a synthetic detergent;
to form a liquid detergent-bleach composition; and(c) allowing the liquid detergent-bleach composition to thicken and solidify. - View Dependent Claims (19, 21, 22, 24, 26, 27, 29, 31, 32)
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18. A process for forming a substantially uniform solid cast detergent-bleach composition, comprising the steps of:
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(a) heating about 20 to 75 wt-%, based upon the composition, of a 40 to 80 wt-% aqueous solution of an alkali metal hydroxide to about 50°
to 95°
C.;(b) substantially uniformly distributing into the aqueous solution; (i) an effective amount of a wash water hardness sequestrant; (ii) about 0-15 wt-%, based upon the composition, polyelectrolyte which is different than the hardness-sequestrant; and (iii) about 10 to 60 wt-%, based upon the composition, alkaline hydratable chemical which is different than the hardness-sequestrant and the polyelectrolyte;
to form a liquid detergent composition;(c) blending without substantial agitation about 0.5 to 25 wt-%, based upon the composition, encapsulated bleach particles and the liquid detergent composition, the encapsulated bleach particles comprising; (i) about 20 to 90 wt-%, based upon the encapsulated bleach particles, core which comprises a source of active halogen bleach; (ii) about 0 to 50 wt-%, based upon the encapsulated bleach particles, first coating which comprises a soluble inorganic coating agent; and (iii) about 10 to 80 wt-%, based upon the encapsulated bleach particles, second coating which comprises a synthetic detergent; to form a liquid detergent-bleach composition; and (d) allowing the liquid detergent-bleach composition to thicken and solidify. - View Dependent Claims (20, 23, 25, 28, 30)
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33. A process for forming a substantially uniform solid cast detergent-bleach composition, comprising the steps of:
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(a) heating about 35 to 75 wt-%, based upon the composition, of a 40 to 80 wt-% sodium hydroxide aqueous solution, to about 50°
to 95°
C.(b) substantially uniformally distributing in the aqueous solution; (i) an effective amount of sodium tripolyphosphate as a wash water hardness sequestrant; (ii) about 0 to 15 wt-%, based upon the composition, polyacrylate; (iii) about 25 to 60 wt-%, based upon the composition, alkaline hydratable chemical selected from the group consisting of anhydrous sodium hydroxide, anhydrous alkali metal polyphosphate and mixtures thereof; to form a liquid detergent composition; (c) blending with the liquid detergent composition, without substantial agitation, about 3 to 12 wt-%, based upon the composition, encapsulated bleach particles, comprising; (i) about 35 to 60 wt-%, based upon the encapsulated bleach particles, core which comprises dichloroisocyanurate; (ii) about 0 to 40 wt-%, based upon the encapsulated bleach particles, first coating selected from the group consisting of alkali metal phosphates, alkali metal sulfates and mixtures thereof; and (iii) about 10 to 40 wt-%, based upon the encapsulated bleach particles, second coating comprising an alkyl sulfonate or an alkali metal salt thereof; to form a liquid detergent composition; and (d) rapidly cooling the liquid detergent-bleach composition by contacting the composition with water in order to thicken and solidify the composition.
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Specification