Copolymers of polyaspartic acid
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United States of America Patent
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Nov 14, 1995
Issued Date -
N/A
app pub date -
Jan 17, 1995
filing date -
Aug 7, 1992
priority date (Note) -
Expired
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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.
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