| 摘要 |
A method for the preparation of esters of pentavalent antimony and mixed esters of trivalent antimony and pentavalent antimony with polyhydroxy compounds having vicinal hydroxy groups in solutions of the polyhydroxy compounds or other polar organic solvents, which comprises (1) oxidizing antimony trioxide with aqueous nitric acid in presence of hydrochloric acid to provide pentavalent antimony oxide and hydroxide or mixed trivalent and pentavalent antimony oxides and hydroxides, (2) adding the oxides and hydroxides to an excess of the polyhydroxy compound and heating to cause the components to react while simultaneously distilling under reduced pressure to remove water of reaction, and optionally (3) removing the bulk of the excess unreacted polyhydroxy compound by continued distillation to form a slurry of the ester or mixed esters in the remaining polyhydroxy compound, and either recovering the crystallized pentavalent antimony ester or dissolving the slurry in another polar organic solvent. The solutions are used to incorporate antimony into organic polymers to provide flame resistance.
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