Process for refining 1,3-dimethyl-2-imidazolidinone

Details Process for refining 1,3-dimethyl-2-imidazolidinone Process for refining 1,3-dimethyl-2-imidazolidinone

1990-12-13

1991-12-24

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C08G 1820

Patent

active

050754068

ABSTRACT:
The present invention is directed to a refining process for removing impurities from 1,3-dimethyl-2-imidazolidinone (DMI) by the use of a composite salt; and a process for preparing an aromatic polyamide having a high polymerization degree from an aromatic diisocyanate and an aromatic dicarboxylic acid by using, as a reaction solvent, DMI purified by the above-mentioned process.

REFERENCES:
patent: 2993906 (1961-07-01), Sprenger et al.
patent: 4701555 (1987-10-01), Young et al.
patent: 4795795 (1989-01-01), Kouno et al.

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