Production of solid polyaspartate salt
AssigneeSolutia Inc.
InventorDavid A. Martin
Life of this patent
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Abstract
A process for preparing polyaspartic acid salt by bringing solid polysuccinimide and solid alkali metal hydroxide or alkaline earth metal hydroxide into reactive contact to form solid polyaspartate metal salt. The salt is granular and free-flowing.
Claims15
A process for preparing polyaspartate salt which comprises reacting polysuccinimide with solid alkali or alkaline earth metal base to form solid polyaspartate salt.
A process for preparing polyaspartate salt which comprises bringing solid polysuccinimide and solid alkali metal hydroxide into reactive contact to form solid polyaspartate metal salt.
In a process forming polyaspartate salt by base hydrolysis of polysuccinimide, the improvement wherein the hydrolysis is conducted in the solid state.
A process for preparing granular, free-flowing polyaspartate salt which comprises:
- a) thermally condensing L-aspartic acid dispersed in a stirred, liquid organic reaction medium to form a slurry of solid polysuccinimide;
- b) reacting the polysuccinimide in situ with solid alkali metal hydroxide to form solid polyaspartate salt dispersed in the organic medium;
- c) separating the salt from the organic medium;
- and
- d) drying the separated salt to form granular, free-flowing polyaspartate salt.
A solid polyaspartate salt comprising a free-flowing granular mass, wherein said polyaspartate salt is formed nonaqueously.
Solid polyaspartate salt comprising the reaction product of polysuccinimide with solid alkali or alkaline earth metal base.
Dependencies are inferred from the claim text.