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US 6,887,971 B2Granted
Synthesis of polysuccinimide and copoly(succinimide-aspartate) in a supercritical fluid
AssigneeFolia, Inc.
InventorsGraham Swift, Kenneth Michael Doll, Randal Lee Shogren, Ronald Alan Holser, Julious L. Willett
Life of this patent
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Abstract
Disclosed are methods of synthesis of polysuccinimide and a copoly(succinimide-aspartate) using a supercritical fluid.
Claims16
A method for preparing a polysuccinimide, which comprises, subjecting aspartic acid to polymerization in a solvent of supercritical fluid to form a polysuccinimide;
- wherein said supercritical fluid is selected from the group consisting of CO2, NH3, H2O, N2O, xenon, krypton, methane, ethane, ethylene, propane, pentane, methanol, ethanol, isopropanol, isobutanol, CClF3, CFH3, cyclohexanol, CS2 and a mixture thereof.
A method for preparing a copolymer containing copolymerized aspartate units and succinimide units which comprises, subjecting a comonomer mixture of aspartic acid and a salt of aspartic acid to polymerization in a solvent of a supercritical fluid.
Dependencies are inferred from the claim text.