Copolymers of polysuccinimide and polycarboxylic acids

Details Copolymers of polysuccinimide and polycarboxylic acids Copolymers of polysuccinimide and polycarboxylic acids

Filed on

1995-04-13

Date issued

1996-08-06

Examiner

Dodson, Shelley A.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

From carboxylic acid or derivative thereof

Other Related Categories

528345, 528361, 528363, 525418, 525419, 525420, 525435, C08G 6900

Type

Patent

Status

active

Patent number

055434916

Description

ABSTRACT:
Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.
Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.

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