ESTERS OF PENTAVALENT AND TRIVALENT ANTIMONY WITH A POLYHYDROXY COMPOUND AND THE PROCESS FOR MAKING THE SAME

摘要

Esters of pentavalent antimony (Sb+5) with polyhydroxy compounds having vicinal hydroxyl groups, and mixed esters composed of these pentavelent antimony esters in combination with trivalent antimony (Sb+5) esters of polyhydroxy compounds having vicinal hydroxyl groups, which can be made by a process involving reacting antimony trioxide (Sb2O3) with a polyhydroxy compound having vicinal hydroxyl groups and hydrogen peroxide to oxidize at least a portion of the antimony to the pentavalent state. By removing substantially all of the water of reaction there can be produced a pentavalent antimony ester in which four of the valences of the antimony are satisfied by ester linkages through the hydroxyl groups of two molecules of the polyhydroxy compound and the fifth valence of the antimony is satisfied by an ester linkage through a vicinal hydroxyl group of a third molecule of the polyhydroxy compound. The products of the invention are soluble in polar organic solvents customarily used in processing organic polymers and can therefore be conveniently incorporated into polymers to provide increased flame resistance.