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US 5,510,426 AGranted
Copolymers of polyaspartic acid
AssigneeSRCHEM Incorporated
InventorLouis L. Wood
Life of this patent
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Abstract
Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.
Claims5
A copolymer of polysuccinimide wherein the polymer of polysuccinimide is crosslinked with a polyamine.
Dependencies are inferred from the claim text.