Salt of polymer from maleic acid, polyamind and ammonia

Details Salt of polymer from maleic acid, polyamind and ammonia Salt of polymer from maleic acid, polyamind and ammonia

1993-04-07

1994-02-15

Anderson, Harold D.

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

Synthetic resins

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

210698, 433216, 525422, 525435, 528332, 528335, 528345, 528363, C08G 6948

Patent

active

052868109

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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patent: 5152902 (1992-10-01), Koskan et al.
Harada, K. et al. Thermal polycondensation of free amino acids with polyphosphoric acid. Chemical Abstracts vol. 63, Jun. 1965, 685e.
Stinson, S. Polyaspartic acid process developed. Chemical and Engineering News, Jul. 20, 1992, p. 21.
Sarig S. et al. The use of polymers for retardation of scale form. National Coun. Res. Dev. (Rep.) (Isr.) 150-157, Jun. 1977.
Kovacs et al. Chemical Studies of polyaspartic acids. Journal of Organic Chemistry vol. 25, pp. 1084-1091, Jun. 1961.

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