Patent ID: 7857990

Claim:
A composition comprising a mixture of: (i) a major amount of solid calcium hypochlorite, and (ii) an amount of hydrophobic additive that is sufficient to provide a calcium hypochlorite composition having reduced hydrophilic properties, said composition being substantially free of discrete particulate Group IIA and IIIA metal stearate, said hydrophobic additive being a particulate calcium hypochlorite-compatible carrier material chosen from inorganic metal oxide and clay material, the surface of which has been treated with hydrophobizing agent represented by one of the following general formulae, R 1 a MX 4−a I R 2 2n+2 Si n O n−1 II R 1 2m Si m O m III (R 3 Si) 2p O 3p IV wherein (a) M is independently chosen from silicon, titanium or zirconium; (b) each R 1 is independently chosen from a saturated hydrocarbon group containing from 1 to 18 carbon atoms; (c) each X is independently chosen from alkoxy containing from 1 to 12 carbon atoms, or acyloxy containing from 1 to 12 carbon atoms; (d) a is a number chosen from 1 to 4, (e) each R 2 is independently chosen from halo, hydroxy, or R 1 with the proviso that at least 50 mole percent of the R 2 substituents are saturated hydrocarbon groups; (f) n is a number of from 2 to 10,000; (g) m is a number of from 3 to 20, (h) R 3 is chosen from an aliphatic, cycloaliphatic or aryl hydrocarbon containing from 1 to 6 carbon atoms, cyclohexyl, vinyl or phenyl, or a glycidoxy alkyl group, and (i) p is a number chosen from 4 to 1000, the weight ratio of hydrophobizing agent to carrier material being from 1:1 to 1:20.