SLOW DISSOLVING HYPOCHLORITE SHAPED ARTICLE
It has now been discovered that forming a shaped article from a blend of calcium hypochlorite and lime, wherein the lime content is greater than 10% by weight, based on the total weight of the shaped article, the resulting solid shaped article has a favorable dissolution (solubility) profile and the solid shaped article maintains structural integrity during use in an aqueous environment.
1 - 23 . (canceled)
24 . A shaped article comprising a blend of calcium hypochlorite and lime, wherein the total lime content in the shaped article is greater than 10% by weight based on the total weight of the shaped article, and wherein the shaped article further comprises magnesium sulfate.
25 . The shaped article according to claim 24 , wherein the calcium hypochlorite contains hydrated water up to 25% by weight, based on the total weight of the calcium hypochlorite.
26 . The shaped article according to claim 25 , wherein the calcium hypochlorite contains hydrated water between 16% and 25% by weight, based on the total weight of the calcium hypochlorite.
27 . The shaped article according to claim 24 , wherein the magnesium sulfate comprises magnesium sulfate heptahydrate.
28 . The shaped article according to claim 24 , wherein the magnesium sulfate in the shaped article is in an amount up to about 30% by weight, based on total weight of the shaped article.
29 . The shaped article according to claim 24 , wherein the calcium hypochlorite comprises at least 50% by weight of the shaped article and the lime is present in an amount greater than 10% by weight up to about 20% by weight of the shaped article.
30 . The shaped article according to claim 29 , wherein the calcium hypochlorite comprises at least 55 to about 90% by weight of the shaped article and the lime is present in an amount greater than 10% by weight up to about 16% by weight of the shaped article.
31 . The shaped article accordingly to claim 30 , wherein the calcium hypochlorite comprises at least 70% by weight of the shaped article, the lime is present in an amount greater than 10% by weight up to about 16% by weight of the shaped article, and the magnesium sulfate is present in an amount up to 20% of the shaped article.
32 . The shaped article according to claim 24 , further comprising an additive.
33 . The shaped article according to claim 32 , wherein the additive comprises water soluble zinc salts or hydrates of zinc salts, scale inhibiting agents, pigments, dyes, binders, lubricants, color-containing salts and mixtures thereof.
34 . The shaped article according to claim 24 , in the form of tablets, bricks, briquettes, pellets, or an extrusion.
35 . The shaped article according to claim 34 , in the form of tablet.
36 . The shaped article according to claim 35 , having a dissolution rate such that the shaped article in the form of a tablet dissolves in a range of 3 to 14 days.
37 . The shaped article according to claim 36 , having a dissolution rate such that the shaped article in the form of a tablet dissolves in a range of 3-7 days.
38 . The shaped article according to claim 24 , having a total weight between 1 and 500 grams.
39 . The shaped article according to claim 38 , having a total weight between 150 and 300 grams.
40 . The shaped article according to claim 24 , in the form of a puck-shaped article.
41 . The shaped article according to claim 40 , having a diameter between 1 to 4 inches.
42 . The shaped article according to claim 41 , having a thickness between 1 and 2 inches.