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Rolf; Meinhard
Charleston, SC
No. of patents:

Patent Number Title Of Patent Date Issued
5091532 Process for the preparation of pigments based on isoindole February 25, 1992
A new process for the preparation of pigments of the formula ##STR1## comprises first reacting phthalodinitrile in an organic medium in the presence of a base with an alcohol and then with a compound of the formula ##STR2## in the presence of water at a pH of 1-6.

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