Patent ID: 8287764

Claim:
A coated particle comprising a core material and a shell and wherein said core material is an organic compound selected from the group consisting of chelating agents, said organic compound not being a polymer, and wherein said shell comprises a layered double hydroxide having a layered structure corresponding to the general formula: [M m 2+ M n 3+ (OH) 2m+2n ]X n/z zâˆ’ .bH 2 O wherein M 2+ is a divalent metal ion selected from the group consisting of Zn 2+ , Mn 2+ , Ni 2+ , Co 2+ , Fe 2+ , Cu 2+ , Sn 2+ , Ba 2+ , Ca 2+ , and Mg 2+ ; M 3+ is a trivalent metal ion selected from the group consisting of Al 3+ , Cr 3+ , Fe 3+ , Co 3+ , Mn 3+ , Ni 3+ , Ce 3+ , and Ga 3+ ; m and n have a value such that m/n=1 to 10; b has a value in the range of from 0 to 10; and X is hydroxide or an organic charge-balancing anion which is a linear or branched, saturated or unsaturated C 1 -C 18 alkyl chain optionally comprising one or more functionalities selected from the group consisting of carboxylic acid, hydroxyl, thiol, and amine, and optionally comprising a functional group on the alkyl chain selected from the group consisting of ester, ether, chloride, bromide, thioether, sulfonium, phosphonium, phosphinic, and isocyanate, and Z being the number of charge of said anion X.