aromatic acids carboxylates of acrylic acid unsaturated carboxylates of methacrylic acid and unsaturated carboxylates of vinylacetic acid are disclosed along with methods of synthesis and uses application_number US 93595201 A description the three general steps of synthesizing hydrotalcites of the present invention are given below success in preparing the synthetic hydrotalcites of the present invention depends greatly on the complete reaction in step i i e the trivalent cation reacting with the specific carboxylic acid the preparation of hydrotalcites from longer chain than c 4 carboxylic acids and water insoluble aromatic acids is accomplished by driving the reaction of step i closer to completion preferably by utilizing one or more of the following approaches 1 the reaction time for step i can be increased from 30 minutes as in the schutz 39 329 patent to from 4 to 8 hours 2 inert organic solvents can be used as a reaction media for water insoluble organic carboxylic acids with the trivalent cation source and 3 step i can be carried out in a melt of the organic anion in the examples described herein the following materials were used trivalent cation source unless otherwise specified was catapal u00ae alumina which is aluminum oxide monohydroxide from vista chemical corporation divalent cation source martin magnesia specialties inc magcbem u00ae 200d a high purity highly reactive magnesium oxide powder acids were from aldrich chemical company and.