Patent ID: 7258898

Claim:
A process for coating an object with a divalent metal phosphate, the process comprising the steps of: (a) preparing a sol containing a divalent metal phosphonate complex wherein a divalent metal is coordinated to a phosphonate compound according to formula (1) R—C(O)—O—P(O)R 1 —O—C(O)—.R 2 (1) wherein R, R 1 and R 2 , which may be the same or different, are selected from the group consisting of hydrogen, substituted alkyl groups and unsubstituted alkyl groups; and (b) dipping the object into the sol; (c) heating the dipped object in order to remove any solvent; and (d) firing the heated object to allow conversion of the divalent metal phosphonate complex into the divalent metal phosphate.