Laundry detergent containing a coated percarbonate and an acidification agent to provide delayed lowered pH
AssigneeThe Proctor & Gamble Company
InventorFiona Susan MacBeath
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Abstract
There is provided a particulate solid laundry detergent composition containing alkali metal percarbonate bleach coated with a mixed salt comprising an alkali metal carbonate and an alkali metal sulphate salt; a peroxyacid bleach precursor; an acidification agent; and a means for enabling delayed release of said acidification agent such that the pH of said composition as a 1% solution in water at 20.degree. C. is from 9.5 to 13.0 prior to release of said acidification agent, and such that the pH of said composition as a 1% solution in water at 20.degree. C. is from 9.3 to 7.0 subsequent to complete release of said acidification agent.
Claims16
A particulate solid laundry detergent composition comprising:
- (a) from 3% to 40% by weight of an alkali metal percarbonate bleach coated with a mixed salt comprising an alkali metal carbonate and an alkali metal sulphate salt;
- (b) from 0.5% to 15% by weight of a peroxyacid bleach precursor which is of the formula;
- (CH.sub.3 CO).sub.2 --N--(CH.sub.2).sub.x --N--(CH.sub.3 CO).sub.2
- where x is 0 or an integer from 1 to 6;
- (c) from 0.1% to 40% by weight of an acidification agent;
- wherein the acidification agent is provided with a coating enabling the delayed release of said acidification agent, the coating comprising a first coating comprising wax and a second coating comprising silica such that the pH of said composition as a 1% solution in water at 20.degree. C. is from 9.5 to 13.0 prior to release of said acidification agent, and such that the pH of said composition as a 1% solution in water at 20.degree. C. is from 7.0 to 9.3 subsequent to complete release of said acidification agent.
Dependencies are inferred from the claim text.