Stabilization with alkali metal compound material of certain thermally unstable DMT
AssigneeHercules Incorporated
InventorDonald Kirkbright Black
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Abstract
Disclosed is the stabilization of thermally unstable, fresh dimethyl terephthalate of at least 99.8 weight % purity, free of alkali metal compound material, and produced by the cooxidation-esterification process. Stabilization is effected by incorporating therein a stabilizing quantity of alkali metal compound material having no significant concentration of either phosphonic acid moiety or phosphite moiety.
Claims8
A thermally stable composition consisting essentially of (1) thermally unstable fresh dimethyl terephthalate of extremely high purity, free of alkali metal compound material, having no significant concentration of either phosphonic acid moiety or phosphite moity, and produced by the cooxidationesterification process, and (2) dispersed therein at a stabilizing concentration, alkali metal monomethyl terehthalate.
A process for stabilizing thermally unstable fresh dimethyl terephthalate of extremely high purity, free of alkali metal compound material, having no significant concentration of either phosphonic acid moiety or phosphite moiety, and produced by the cooxidation-esterification process, which comprises incorporating into said dimethyl terephthalate a stabilizing quantity of alkali metal monomethyl terephthalate.
Dependencies are inferred from the claim text.