Method for the preparation of modified synthetic hydrotalcite

摘要

A phosphate-containing synthetic hydrotalcite of the following empirical formula:PPxMgO.Al.sub.2 O.sub.3.yPO.sub.4.zH. sub.2 OPPwherein, x, y and z are integers indicating the number of moles present of MgO, PO.sub.4 and H.sub.2 O, respectively. The phosphate-containing hydrotalcite being prepared by the addition of sufficient phosphoric acid to the reaction mixture to liberate carbon dioxide. The phosphate-containing hydrotalcite improves the flame retardant characteristics by providing char promotion to the system.