Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1993-03-16
1994-03-08
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528332, 528335, 528342, 528363, C08G 6928
Patent
active
052928586
ABSTRACT:
Copolymers of polyamino acids formed by reaction of an alcohol with maleic anhydride to form the half ester followed by addition of ammonia, ammonia and an amine, or ammonia and a polyamine. The mixture is then heated to 120.degree.-350.degree. C. to form polysuccinimide or a derivative thereof. The resulting polysuccinimide may be hydrolyzed to form a derivative of polyaspartic acid or its salt.
REFERENCES:
patent: 3351520 (1967-03-01), Spicer et al.
patent: 3846380 (1974-02-01), Fujimoto et al.
Ser. No. 07/968, Copolymers of Polyamino Acids as Tartar Barrier Agents, Louis L. Wood, Gary J. Calton, filed Oct. 29, 1992.
Ser. No. 07/968,319, Copolymers of Polyamino Acids as Scale Inhibition Agents, Louis L. Wood, Gary J. Calton, Filed Oct. 29, 1993.
Anderson Harold D.
Ramsey William S.
SRCHEM Incorporated
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