Polyaspartic acid from maleic acid and ammonia

Details Polyaspartic acid from maleic acid and ammonia Polyaspartic acid from maleic acid and ammonia

1987-08-03

1989-06-13

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

71 27, 71 85, 71118, 252 80, 252175, 525419, 525420, 525539, 528328, C08G 6900

Patent

active

048394610

ABSTRACT:
Polyaspartic acid and its salts, which can be obtained by reacting maleic acid and ammonia in a molar ratio of 1:1-1.5 at 120.degree.-150.degree. C. and , if appropriate, converting the acid into salts, are used for removing and preventing incrustations formed by the hardness constituents of water, or as a fertilizer.

REFERENCES:
patent: 3052655 (1962-09-01), Fox et al.
patent: 3474083 (1969-10-01), Shiga et al.
patent: 4385169 (1983-05-01), Kato et al.

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