Patent ID: 7629480

Claim:
Organic acid anion containing aluminum salt hydroxide particles represented by the following general formula (I): M a [Al 1-x M′ x ] b A z B y (OH) n .mH 2 O (I) (wherein M is at least one cation selected from the group consisting of Na + , K + and NH 4+ , M ′ is at least one metal cation selected from the group consisting of Cu 2+ , Zn 2+ , Ni 2+ , Sn 4+ , Zr 4+ , Fe 2+ , Fe 3+ and Ti 4+ , A is at least one organic acid anion based on an organic acid selected from the group consisting of (i) an organic carboxylic acid having 2 to 10 carbon atoms and 1 to 4 carboxyl groups and (ii) an organic oxycarboxylic acid having 2 to 10 carbon atoms and 1 to 4 carboxyl groups, B is at least one inorganic acid anion selected from the group consisting of a sulfate ion, a phosphate ion and a nitrate ion, and a, b, m, n, x, y and z satisfy 0.7≦a≦1.35, 2.7≦b≦3.3, 0≦m≦5, 4≦n≦7, 0≦x≦0.6, 1.7≦y≦2.4, and 0.001≦z≦0.5, respectively).