Method of increasing the molecular weight in the manufacture of

Details Method of increasing the molecular weight in the manufacture of Method of increasing the molecular weight in the manufacture of

1991-07-05

1992-08-25

Springer, David B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548543, 548546, C07D207325, C07D40306

Patent

active

051420627

ABSTRACT:
A method of manufacturing polysuccinimides with molecular weights in the range 100,000 to about 200,000 by polycondensation of aspartic acid, with phosphoric acids as condensation agents, in at least two process stages, at temperatures of 100.degree.-250.degree. C. and under reduced pressure, where in the second stage the mixture containing aspartic acid and phosphoric acid undergoes subsequent condensation following comminution.

REFERENCES:
patent: 3352860 (1967-11-01), Hass et al.
patent: 3452002 (1969-06-01), Brasch

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