Patent ID: 7135430

Claim:
A layered double hydroxide of formula (I), M(II) 1-x M(III) x (OH) 2 Y x/m ·nH 2 O (I) wherein, Y is an anion of an organic fluorine compound having a fluorocarbon chain, and a valence number of m, M(II) is a divalent metal ion, M(III) is a trivalent metal ion, X is 0.1 to 0.5, and n is a positive integer, wherein the layered double hydroxide is a solid obtained by adding one or more divalent and trivalent metal salts to a solution comprising the organic fluorine compound having a fluorocarbon chain to precipitate the layered double hydroxide wherein the layered double hydroxide has the fluorine compound present between layers, and separating the precipitate by solid-liquid separation.