Copolymers of polyaspartic acid

Details Copolymers of polyaspartic acid Copolymers of polyaspartic acid

1994-02-14

1994-10-18

Kight, II, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525421, 525422, 528310, 528332, 528335, 528345, 528363, C08G 6948

Patent

active

053570049

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. Alkyl or substituted alkyl groups may be incorporated in the backbone of the polymer by adding a alkyl or substituted alkyl monoamine to maleic acid and ammonia and heating at 120.degree. C. or more until polymerization has occurred.

REFERENCES:
patent: 3351520 (1967-11-01), Spicer et al.
patent: 4585855 (1986-04-01), Gaku et al.
patent: 4913828 (1990-04-01), Caswell et al.
patent: 5219952 (1993-06-01), Koskan et al.

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